3956 lines
106 KiB
C
3956 lines
106 KiB
C
/*
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* Copyright (c) 2006 - 2009 Mellanox Technology Inc. All rights reserved.
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* Copyright (C) 2008 - 2011 Bart Van Assche <bvanassche@acm.org>.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/err.h>
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#include <linux/ctype.h>
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#include <linux/kthread.h>
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#include <linux/string.h>
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#include <linux/delay.h>
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#include <linux/atomic.h>
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#include <linux/inet.h>
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#include <rdma/ib_cache.h>
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#include <scsi/scsi_proto.h>
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#include <scsi/scsi_tcq.h>
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#include <target/target_core_base.h>
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#include <target/target_core_fabric.h>
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#include "ib_srpt.h"
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/* Name of this kernel module. */
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#define DRV_NAME "ib_srpt"
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#define SRPT_ID_STRING "Linux SRP target"
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#undef pr_fmt
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#define pr_fmt(fmt) DRV_NAME " " fmt
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MODULE_AUTHOR("Vu Pham and Bart Van Assche");
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MODULE_DESCRIPTION("SCSI RDMA Protocol target driver");
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MODULE_LICENSE("Dual BSD/GPL");
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/*
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* Global Variables
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*/
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static u64 srpt_service_guid;
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static DEFINE_SPINLOCK(srpt_dev_lock); /* Protects srpt_dev_list. */
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static LIST_HEAD(srpt_dev_list); /* List of srpt_device structures. */
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static unsigned srp_max_req_size = DEFAULT_MAX_REQ_SIZE;
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module_param(srp_max_req_size, int, 0444);
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MODULE_PARM_DESC(srp_max_req_size,
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"Maximum size of SRP request messages in bytes.");
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static int srpt_srq_size = DEFAULT_SRPT_SRQ_SIZE;
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module_param(srpt_srq_size, int, 0444);
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MODULE_PARM_DESC(srpt_srq_size,
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"Shared receive queue (SRQ) size.");
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static int srpt_get_u64_x(char *buffer, const struct kernel_param *kp)
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{
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return sprintf(buffer, "0x%016llx\n", *(u64 *)kp->arg);
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}
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module_param_call(srpt_service_guid, NULL, srpt_get_u64_x, &srpt_service_guid,
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0444);
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MODULE_PARM_DESC(srpt_service_guid,
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"Using this value for ioc_guid, id_ext, and cm_listen_id instead of using the node_guid of the first HCA.");
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static struct ib_client srpt_client;
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/* Protects both rdma_cm_port and rdma_cm_id. */
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static DEFINE_MUTEX(rdma_cm_mutex);
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/* Port number RDMA/CM will bind to. */
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static u16 rdma_cm_port;
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static struct rdma_cm_id *rdma_cm_id;
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static void srpt_release_cmd(struct se_cmd *se_cmd);
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static void srpt_free_ch(struct kref *kref);
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static int srpt_queue_status(struct se_cmd *cmd);
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static void srpt_recv_done(struct ib_cq *cq, struct ib_wc *wc);
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static void srpt_send_done(struct ib_cq *cq, struct ib_wc *wc);
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static void srpt_process_wait_list(struct srpt_rdma_ch *ch);
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/*
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* The only allowed channel state changes are those that change the channel
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* state into a state with a higher numerical value. Hence the new > prev test.
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*/
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static bool srpt_set_ch_state(struct srpt_rdma_ch *ch, enum rdma_ch_state new)
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{
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unsigned long flags;
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enum rdma_ch_state prev;
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bool changed = false;
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spin_lock_irqsave(&ch->spinlock, flags);
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prev = ch->state;
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if (new > prev) {
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ch->state = new;
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changed = true;
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}
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spin_unlock_irqrestore(&ch->spinlock, flags);
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return changed;
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}
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/**
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* srpt_event_handler - asynchronous IB event callback function
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* @handler: IB event handler registered by ib_register_event_handler().
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* @event: Description of the event that occurred.
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*
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* Callback function called by the InfiniBand core when an asynchronous IB
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* event occurs. This callback may occur in interrupt context. See also
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* section 11.5.2, Set Asynchronous Event Handler in the InfiniBand
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* Architecture Specification.
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*/
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static void srpt_event_handler(struct ib_event_handler *handler,
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struct ib_event *event)
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{
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struct srpt_device *sdev =
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container_of(handler, struct srpt_device, event_handler);
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struct srpt_port *sport;
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u8 port_num;
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pr_debug("ASYNC event= %d on device= %s\n", event->event,
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dev_name(&sdev->device->dev));
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switch (event->event) {
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case IB_EVENT_PORT_ERR:
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port_num = event->element.port_num - 1;
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if (port_num < sdev->device->phys_port_cnt) {
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sport = &sdev->port[port_num];
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sport->lid = 0;
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sport->sm_lid = 0;
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} else {
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WARN(true, "event %d: port_num %d out of range 1..%d\n",
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event->event, port_num + 1,
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sdev->device->phys_port_cnt);
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}
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break;
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case IB_EVENT_PORT_ACTIVE:
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case IB_EVENT_LID_CHANGE:
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case IB_EVENT_PKEY_CHANGE:
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case IB_EVENT_SM_CHANGE:
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case IB_EVENT_CLIENT_REREGISTER:
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case IB_EVENT_GID_CHANGE:
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/* Refresh port data asynchronously. */
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port_num = event->element.port_num - 1;
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if (port_num < sdev->device->phys_port_cnt) {
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sport = &sdev->port[port_num];
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if (!sport->lid && !sport->sm_lid)
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schedule_work(&sport->work);
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} else {
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WARN(true, "event %d: port_num %d out of range 1..%d\n",
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event->event, port_num + 1,
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sdev->device->phys_port_cnt);
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}
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break;
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default:
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pr_err("received unrecognized IB event %d\n", event->event);
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break;
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}
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}
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/**
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* srpt_srq_event - SRQ event callback function
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* @event: Description of the event that occurred.
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* @ctx: Context pointer specified at SRQ creation time.
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*/
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static void srpt_srq_event(struct ib_event *event, void *ctx)
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{
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pr_debug("SRQ event %d\n", event->event);
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}
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static const char *get_ch_state_name(enum rdma_ch_state s)
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{
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switch (s) {
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case CH_CONNECTING:
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return "connecting";
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case CH_LIVE:
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return "live";
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case CH_DISCONNECTING:
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return "disconnecting";
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case CH_DRAINING:
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return "draining";
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case CH_DISCONNECTED:
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return "disconnected";
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}
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return "???";
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}
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/**
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* srpt_qp_event - QP event callback function
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* @event: Description of the event that occurred.
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* @ch: SRPT RDMA channel.
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*/
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static void srpt_qp_event(struct ib_event *event, struct srpt_rdma_ch *ch)
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{
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pr_debug("QP event %d on ch=%p sess_name=%s-%d state=%s\n",
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event->event, ch, ch->sess_name, ch->qp->qp_num,
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get_ch_state_name(ch->state));
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switch (event->event) {
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case IB_EVENT_COMM_EST:
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if (ch->using_rdma_cm)
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rdma_notify(ch->rdma_cm.cm_id, event->event);
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else
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ib_cm_notify(ch->ib_cm.cm_id, event->event);
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break;
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case IB_EVENT_QP_LAST_WQE_REACHED:
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pr_debug("%s-%d, state %s: received Last WQE event.\n",
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ch->sess_name, ch->qp->qp_num,
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get_ch_state_name(ch->state));
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break;
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default:
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pr_err("received unrecognized IB QP event %d\n", event->event);
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break;
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}
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}
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/**
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* srpt_set_ioc - initialize a IOUnitInfo structure
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* @c_list: controller list.
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* @slot: one-based slot number.
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* @value: four-bit value.
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*
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* Copies the lowest four bits of value in element slot of the array of four
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* bit elements called c_list (controller list). The index slot is one-based.
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*/
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static void srpt_set_ioc(u8 *c_list, u32 slot, u8 value)
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{
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u16 id;
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u8 tmp;
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id = (slot - 1) / 2;
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if (slot & 0x1) {
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tmp = c_list[id] & 0xf;
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c_list[id] = (value << 4) | tmp;
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} else {
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tmp = c_list[id] & 0xf0;
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c_list[id] = (value & 0xf) | tmp;
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}
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}
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/**
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* srpt_get_class_port_info - copy ClassPortInfo to a management datagram
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* @mad: Datagram that will be sent as response to DM_ATTR_CLASS_PORT_INFO.
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*
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* See also section 16.3.3.1 ClassPortInfo in the InfiniBand Architecture
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* Specification.
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*/
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static void srpt_get_class_port_info(struct ib_dm_mad *mad)
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{
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struct ib_class_port_info *cif;
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cif = (struct ib_class_port_info *)mad->data;
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memset(cif, 0, sizeof(*cif));
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cif->base_version = 1;
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cif->class_version = 1;
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ib_set_cpi_resp_time(cif, 20);
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mad->mad_hdr.status = 0;
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}
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/**
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* srpt_get_iou - write IOUnitInfo to a management datagram
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* @mad: Datagram that will be sent as response to DM_ATTR_IOU_INFO.
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*
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* See also section 16.3.3.3 IOUnitInfo in the InfiniBand Architecture
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* Specification. See also section B.7, table B.6 in the SRP r16a document.
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*/
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static void srpt_get_iou(struct ib_dm_mad *mad)
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{
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struct ib_dm_iou_info *ioui;
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u8 slot;
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int i;
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ioui = (struct ib_dm_iou_info *)mad->data;
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ioui->change_id = cpu_to_be16(1);
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ioui->max_controllers = 16;
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/* set present for slot 1 and empty for the rest */
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srpt_set_ioc(ioui->controller_list, 1, 1);
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for (i = 1, slot = 2; i < 16; i++, slot++)
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srpt_set_ioc(ioui->controller_list, slot, 0);
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mad->mad_hdr.status = 0;
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}
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/**
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* srpt_get_ioc - write IOControllerprofile to a management datagram
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* @sport: HCA port through which the MAD has been received.
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* @slot: Slot number specified in DM_ATTR_IOC_PROFILE query.
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* @mad: Datagram that will be sent as response to DM_ATTR_IOC_PROFILE.
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*
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* See also section 16.3.3.4 IOControllerProfile in the InfiniBand
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* Architecture Specification. See also section B.7, table B.7 in the SRP
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* r16a document.
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*/
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static void srpt_get_ioc(struct srpt_port *sport, u32 slot,
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struct ib_dm_mad *mad)
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{
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struct srpt_device *sdev = sport->sdev;
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struct ib_dm_ioc_profile *iocp;
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int send_queue_depth;
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iocp = (struct ib_dm_ioc_profile *)mad->data;
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if (!slot || slot > 16) {
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mad->mad_hdr.status
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= cpu_to_be16(DM_MAD_STATUS_INVALID_FIELD);
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return;
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}
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if (slot > 2) {
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mad->mad_hdr.status
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= cpu_to_be16(DM_MAD_STATUS_NO_IOC);
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return;
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}
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if (sdev->use_srq)
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send_queue_depth = sdev->srq_size;
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else
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send_queue_depth = min(MAX_SRPT_RQ_SIZE,
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sdev->device->attrs.max_qp_wr);
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memset(iocp, 0, sizeof(*iocp));
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strcpy(iocp->id_string, SRPT_ID_STRING);
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iocp->guid = cpu_to_be64(srpt_service_guid);
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iocp->vendor_id = cpu_to_be32(sdev->device->attrs.vendor_id);
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iocp->device_id = cpu_to_be32(sdev->device->attrs.vendor_part_id);
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iocp->device_version = cpu_to_be16(sdev->device->attrs.hw_ver);
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iocp->subsys_vendor_id = cpu_to_be32(sdev->device->attrs.vendor_id);
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iocp->subsys_device_id = 0x0;
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iocp->io_class = cpu_to_be16(SRP_REV16A_IB_IO_CLASS);
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iocp->io_subclass = cpu_to_be16(SRP_IO_SUBCLASS);
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iocp->protocol = cpu_to_be16(SRP_PROTOCOL);
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iocp->protocol_version = cpu_to_be16(SRP_PROTOCOL_VERSION);
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iocp->send_queue_depth = cpu_to_be16(send_queue_depth);
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iocp->rdma_read_depth = 4;
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iocp->send_size = cpu_to_be32(srp_max_req_size);
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iocp->rdma_size = cpu_to_be32(min(sport->port_attrib.srp_max_rdma_size,
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1U << 24));
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iocp->num_svc_entries = 1;
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iocp->op_cap_mask = SRP_SEND_TO_IOC | SRP_SEND_FROM_IOC |
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SRP_RDMA_READ_FROM_IOC | SRP_RDMA_WRITE_FROM_IOC;
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mad->mad_hdr.status = 0;
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}
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/**
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* srpt_get_svc_entries - write ServiceEntries to a management datagram
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* @ioc_guid: I/O controller GUID to use in reply.
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* @slot: I/O controller number.
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* @hi: End of the range of service entries to be specified in the reply.
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* @lo: Start of the range of service entries to be specified in the reply..
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* @mad: Datagram that will be sent as response to DM_ATTR_SVC_ENTRIES.
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*
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* See also section 16.3.3.5 ServiceEntries in the InfiniBand Architecture
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* Specification. See also section B.7, table B.8 in the SRP r16a document.
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*/
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static void srpt_get_svc_entries(u64 ioc_guid,
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u16 slot, u8 hi, u8 lo, struct ib_dm_mad *mad)
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{
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struct ib_dm_svc_entries *svc_entries;
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WARN_ON(!ioc_guid);
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if (!slot || slot > 16) {
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mad->mad_hdr.status
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= cpu_to_be16(DM_MAD_STATUS_INVALID_FIELD);
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return;
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}
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if (slot > 2 || lo > hi || hi > 1) {
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mad->mad_hdr.status
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= cpu_to_be16(DM_MAD_STATUS_NO_IOC);
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return;
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}
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svc_entries = (struct ib_dm_svc_entries *)mad->data;
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memset(svc_entries, 0, sizeof(*svc_entries));
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svc_entries->service_entries[0].id = cpu_to_be64(ioc_guid);
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snprintf(svc_entries->service_entries[0].name,
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sizeof(svc_entries->service_entries[0].name),
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"%s%016llx",
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SRP_SERVICE_NAME_PREFIX,
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ioc_guid);
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mad->mad_hdr.status = 0;
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}
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/**
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* srpt_mgmt_method_get - process a received management datagram
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* @sp: HCA port through which the MAD has been received.
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* @rq_mad: received MAD.
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* @rsp_mad: response MAD.
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*/
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static void srpt_mgmt_method_get(struct srpt_port *sp, struct ib_mad *rq_mad,
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struct ib_dm_mad *rsp_mad)
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{
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u16 attr_id;
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u32 slot;
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u8 hi, lo;
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attr_id = be16_to_cpu(rq_mad->mad_hdr.attr_id);
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switch (attr_id) {
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case DM_ATTR_CLASS_PORT_INFO:
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srpt_get_class_port_info(rsp_mad);
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break;
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case DM_ATTR_IOU_INFO:
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srpt_get_iou(rsp_mad);
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break;
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case DM_ATTR_IOC_PROFILE:
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slot = be32_to_cpu(rq_mad->mad_hdr.attr_mod);
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srpt_get_ioc(sp, slot, rsp_mad);
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break;
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case DM_ATTR_SVC_ENTRIES:
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slot = be32_to_cpu(rq_mad->mad_hdr.attr_mod);
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hi = (u8) ((slot >> 8) & 0xff);
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lo = (u8) (slot & 0xff);
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slot = (u16) ((slot >> 16) & 0xffff);
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srpt_get_svc_entries(srpt_service_guid,
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slot, hi, lo, rsp_mad);
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break;
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default:
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rsp_mad->mad_hdr.status =
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cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD_ATTR);
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break;
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}
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}
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/**
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* srpt_mad_send_handler - MAD send completion callback
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* @mad_agent: Return value of ib_register_mad_agent().
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* @mad_wc: Work completion reporting that the MAD has been sent.
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*/
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static void srpt_mad_send_handler(struct ib_mad_agent *mad_agent,
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struct ib_mad_send_wc *mad_wc)
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{
|
|
rdma_destroy_ah(mad_wc->send_buf->ah, RDMA_DESTROY_AH_SLEEPABLE);
|
|
ib_free_send_mad(mad_wc->send_buf);
|
|
}
|
|
|
|
/**
|
|
* srpt_mad_recv_handler - MAD reception callback function
|
|
* @mad_agent: Return value of ib_register_mad_agent().
|
|
* @send_buf: Not used.
|
|
* @mad_wc: Work completion reporting that a MAD has been received.
|
|
*/
|
|
static void srpt_mad_recv_handler(struct ib_mad_agent *mad_agent,
|
|
struct ib_mad_send_buf *send_buf,
|
|
struct ib_mad_recv_wc *mad_wc)
|
|
{
|
|
struct srpt_port *sport = (struct srpt_port *)mad_agent->context;
|
|
struct ib_ah *ah;
|
|
struct ib_mad_send_buf *rsp;
|
|
struct ib_dm_mad *dm_mad;
|
|
|
|
if (!mad_wc || !mad_wc->recv_buf.mad)
|
|
return;
|
|
|
|
ah = ib_create_ah_from_wc(mad_agent->qp->pd, mad_wc->wc,
|
|
mad_wc->recv_buf.grh, mad_agent->port_num);
|
|
if (IS_ERR(ah))
|
|
goto err;
|
|
|
|
BUILD_BUG_ON(offsetof(struct ib_dm_mad, data) != IB_MGMT_DEVICE_HDR);
|
|
|
|
rsp = ib_create_send_mad(mad_agent, mad_wc->wc->src_qp,
|
|
mad_wc->wc->pkey_index, 0,
|
|
IB_MGMT_DEVICE_HDR, IB_MGMT_DEVICE_DATA,
|
|
GFP_KERNEL,
|
|
IB_MGMT_BASE_VERSION);
|
|
if (IS_ERR(rsp))
|
|
goto err_rsp;
|
|
|
|
rsp->ah = ah;
|
|
|
|
dm_mad = rsp->mad;
|
|
memcpy(dm_mad, mad_wc->recv_buf.mad, sizeof(*dm_mad));
|
|
dm_mad->mad_hdr.method = IB_MGMT_METHOD_GET_RESP;
|
|
dm_mad->mad_hdr.status = 0;
|
|
|
|
switch (mad_wc->recv_buf.mad->mad_hdr.method) {
|
|
case IB_MGMT_METHOD_GET:
|
|
srpt_mgmt_method_get(sport, mad_wc->recv_buf.mad, dm_mad);
|
|
break;
|
|
case IB_MGMT_METHOD_SET:
|
|
dm_mad->mad_hdr.status =
|
|
cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD_ATTR);
|
|
break;
|
|
default:
|
|
dm_mad->mad_hdr.status =
|
|
cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD);
|
|
break;
|
|
}
|
|
|
|
if (!ib_post_send_mad(rsp, NULL)) {
|
|
ib_free_recv_mad(mad_wc);
|
|
/* will destroy_ah & free_send_mad in send completion */
|
|
return;
|
|
}
|
|
|
|
ib_free_send_mad(rsp);
|
|
|
|
err_rsp:
|
|
rdma_destroy_ah(ah, RDMA_DESTROY_AH_SLEEPABLE);
|
|
err:
|
|
ib_free_recv_mad(mad_wc);
|
|
}
|
|
|
|
static int srpt_format_guid(char *buf, unsigned int size, const __be64 *guid)
|
|
{
|
|
const __be16 *g = (const __be16 *)guid;
|
|
|
|
return snprintf(buf, size, "%04x:%04x:%04x:%04x",
|
|
be16_to_cpu(g[0]), be16_to_cpu(g[1]),
|
|
be16_to_cpu(g[2]), be16_to_cpu(g[3]));
|
|
}
|
|
|
|
/**
|
|
* srpt_refresh_port - configure a HCA port
|
|
* @sport: SRPT HCA port.
|
|
*
|
|
* Enable InfiniBand management datagram processing, update the cached sm_lid,
|
|
* lid and gid values, and register a callback function for processing MADs
|
|
* on the specified port.
|
|
*
|
|
* Note: It is safe to call this function more than once for the same port.
|
|
*/
|
|
static int srpt_refresh_port(struct srpt_port *sport)
|
|
{
|
|
struct ib_mad_reg_req reg_req;
|
|
struct ib_port_modify port_modify;
|
|
struct ib_port_attr port_attr;
|
|
int ret;
|
|
|
|
ret = ib_query_port(sport->sdev->device, sport->port, &port_attr);
|
|
if (ret)
|
|
return ret;
|
|
|
|
sport->sm_lid = port_attr.sm_lid;
|
|
sport->lid = port_attr.lid;
|
|
|
|
ret = rdma_query_gid(sport->sdev->device, sport->port, 0, &sport->gid);
|
|
if (ret)
|
|
return ret;
|
|
|
|
srpt_format_guid(sport->guid_name, ARRAY_SIZE(sport->guid_name),
|
|
&sport->gid.global.interface_id);
|
|
snprintf(sport->gid_name, ARRAY_SIZE(sport->gid_name),
|
|
"0x%016llx%016llx",
|
|
be64_to_cpu(sport->gid.global.subnet_prefix),
|
|
be64_to_cpu(sport->gid.global.interface_id));
|
|
|
|
if (rdma_protocol_iwarp(sport->sdev->device, sport->port))
|
|
return 0;
|
|
|
|
memset(&port_modify, 0, sizeof(port_modify));
|
|
port_modify.set_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP;
|
|
port_modify.clr_port_cap_mask = 0;
|
|
|
|
ret = ib_modify_port(sport->sdev->device, sport->port, 0, &port_modify);
|
|
if (ret) {
|
|
pr_warn("%s-%d: enabling device management failed (%d). Note: this is expected if SR-IOV is enabled.\n",
|
|
dev_name(&sport->sdev->device->dev), sport->port, ret);
|
|
return 0;
|
|
}
|
|
|
|
if (!sport->mad_agent) {
|
|
memset(®_req, 0, sizeof(reg_req));
|
|
reg_req.mgmt_class = IB_MGMT_CLASS_DEVICE_MGMT;
|
|
reg_req.mgmt_class_version = IB_MGMT_BASE_VERSION;
|
|
set_bit(IB_MGMT_METHOD_GET, reg_req.method_mask);
|
|
set_bit(IB_MGMT_METHOD_SET, reg_req.method_mask);
|
|
|
|
sport->mad_agent = ib_register_mad_agent(sport->sdev->device,
|
|
sport->port,
|
|
IB_QPT_GSI,
|
|
®_req, 0,
|
|
srpt_mad_send_handler,
|
|
srpt_mad_recv_handler,
|
|
sport, 0);
|
|
if (IS_ERR(sport->mad_agent)) {
|
|
pr_err("%s-%d: MAD agent registration failed (%ld). Note: this is expected if SR-IOV is enabled.\n",
|
|
dev_name(&sport->sdev->device->dev), sport->port,
|
|
PTR_ERR(sport->mad_agent));
|
|
sport->mad_agent = NULL;
|
|
memset(&port_modify, 0, sizeof(port_modify));
|
|
port_modify.clr_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP;
|
|
ib_modify_port(sport->sdev->device, sport->port, 0,
|
|
&port_modify);
|
|
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* srpt_unregister_mad_agent - unregister MAD callback functions
|
|
* @sdev: SRPT HCA pointer.
|
|
* @port_cnt: number of ports with registered MAD
|
|
*
|
|
* Note: It is safe to call this function more than once for the same device.
|
|
*/
|
|
static void srpt_unregister_mad_agent(struct srpt_device *sdev, int port_cnt)
|
|
{
|
|
struct ib_port_modify port_modify = {
|
|
.clr_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP,
|
|
};
|
|
struct srpt_port *sport;
|
|
int i;
|
|
|
|
for (i = 1; i <= port_cnt; i++) {
|
|
sport = &sdev->port[i - 1];
|
|
WARN_ON(sport->port != i);
|
|
if (sport->mad_agent) {
|
|
ib_modify_port(sdev->device, i, 0, &port_modify);
|
|
ib_unregister_mad_agent(sport->mad_agent);
|
|
sport->mad_agent = NULL;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* srpt_alloc_ioctx - allocate a SRPT I/O context structure
|
|
* @sdev: SRPT HCA pointer.
|
|
* @ioctx_size: I/O context size.
|
|
* @buf_cache: I/O buffer cache.
|
|
* @dir: DMA data direction.
|
|
*/
|
|
static struct srpt_ioctx *srpt_alloc_ioctx(struct srpt_device *sdev,
|
|
int ioctx_size,
|
|
struct kmem_cache *buf_cache,
|
|
enum dma_data_direction dir)
|
|
{
|
|
struct srpt_ioctx *ioctx;
|
|
|
|
ioctx = kzalloc(ioctx_size, GFP_KERNEL);
|
|
if (!ioctx)
|
|
goto err;
|
|
|
|
ioctx->buf = kmem_cache_alloc(buf_cache, GFP_KERNEL);
|
|
if (!ioctx->buf)
|
|
goto err_free_ioctx;
|
|
|
|
ioctx->dma = ib_dma_map_single(sdev->device, ioctx->buf,
|
|
kmem_cache_size(buf_cache), dir);
|
|
if (ib_dma_mapping_error(sdev->device, ioctx->dma))
|
|
goto err_free_buf;
|
|
|
|
return ioctx;
|
|
|
|
err_free_buf:
|
|
kmem_cache_free(buf_cache, ioctx->buf);
|
|
err_free_ioctx:
|
|
kfree(ioctx);
|
|
err:
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* srpt_free_ioctx - free a SRPT I/O context structure
|
|
* @sdev: SRPT HCA pointer.
|
|
* @ioctx: I/O context pointer.
|
|
* @buf_cache: I/O buffer cache.
|
|
* @dir: DMA data direction.
|
|
*/
|
|
static void srpt_free_ioctx(struct srpt_device *sdev, struct srpt_ioctx *ioctx,
|
|
struct kmem_cache *buf_cache,
|
|
enum dma_data_direction dir)
|
|
{
|
|
if (!ioctx)
|
|
return;
|
|
|
|
ib_dma_unmap_single(sdev->device, ioctx->dma,
|
|
kmem_cache_size(buf_cache), dir);
|
|
kmem_cache_free(buf_cache, ioctx->buf);
|
|
kfree(ioctx);
|
|
}
|
|
|
|
/**
|
|
* srpt_alloc_ioctx_ring - allocate a ring of SRPT I/O context structures
|
|
* @sdev: Device to allocate the I/O context ring for.
|
|
* @ring_size: Number of elements in the I/O context ring.
|
|
* @ioctx_size: I/O context size.
|
|
* @buf_cache: I/O buffer cache.
|
|
* @alignment_offset: Offset in each ring buffer at which the SRP information
|
|
* unit starts.
|
|
* @dir: DMA data direction.
|
|
*/
|
|
static struct srpt_ioctx **srpt_alloc_ioctx_ring(struct srpt_device *sdev,
|
|
int ring_size, int ioctx_size,
|
|
struct kmem_cache *buf_cache,
|
|
int alignment_offset,
|
|
enum dma_data_direction dir)
|
|
{
|
|
struct srpt_ioctx **ring;
|
|
int i;
|
|
|
|
WARN_ON(ioctx_size != sizeof(struct srpt_recv_ioctx) &&
|
|
ioctx_size != sizeof(struct srpt_send_ioctx));
|
|
|
|
ring = kvmalloc_array(ring_size, sizeof(ring[0]), GFP_KERNEL);
|
|
if (!ring)
|
|
goto out;
|
|
for (i = 0; i < ring_size; ++i) {
|
|
ring[i] = srpt_alloc_ioctx(sdev, ioctx_size, buf_cache, dir);
|
|
if (!ring[i])
|
|
goto err;
|
|
ring[i]->index = i;
|
|
ring[i]->offset = alignment_offset;
|
|
}
|
|
goto out;
|
|
|
|
err:
|
|
while (--i >= 0)
|
|
srpt_free_ioctx(sdev, ring[i], buf_cache, dir);
|
|
kvfree(ring);
|
|
ring = NULL;
|
|
out:
|
|
return ring;
|
|
}
|
|
|
|
/**
|
|
* srpt_free_ioctx_ring - free the ring of SRPT I/O context structures
|
|
* @ioctx_ring: I/O context ring to be freed.
|
|
* @sdev: SRPT HCA pointer.
|
|
* @ring_size: Number of ring elements.
|
|
* @buf_cache: I/O buffer cache.
|
|
* @dir: DMA data direction.
|
|
*/
|
|
static void srpt_free_ioctx_ring(struct srpt_ioctx **ioctx_ring,
|
|
struct srpt_device *sdev, int ring_size,
|
|
struct kmem_cache *buf_cache,
|
|
enum dma_data_direction dir)
|
|
{
|
|
int i;
|
|
|
|
if (!ioctx_ring)
|
|
return;
|
|
|
|
for (i = 0; i < ring_size; ++i)
|
|
srpt_free_ioctx(sdev, ioctx_ring[i], buf_cache, dir);
|
|
kvfree(ioctx_ring);
|
|
}
|
|
|
|
/**
|
|
* srpt_set_cmd_state - set the state of a SCSI command
|
|
* @ioctx: Send I/O context.
|
|
* @new: New I/O context state.
|
|
*
|
|
* Does not modify the state of aborted commands. Returns the previous command
|
|
* state.
|
|
*/
|
|
static enum srpt_command_state srpt_set_cmd_state(struct srpt_send_ioctx *ioctx,
|
|
enum srpt_command_state new)
|
|
{
|
|
enum srpt_command_state previous;
|
|
|
|
previous = ioctx->state;
|
|
if (previous != SRPT_STATE_DONE)
|
|
ioctx->state = new;
|
|
|
|
return previous;
|
|
}
|
|
|
|
/**
|
|
* srpt_test_and_set_cmd_state - test and set the state of a command
|
|
* @ioctx: Send I/O context.
|
|
* @old: Current I/O context state.
|
|
* @new: New I/O context state.
|
|
*
|
|
* Returns true if and only if the previous command state was equal to 'old'.
|
|
*/
|
|
static bool srpt_test_and_set_cmd_state(struct srpt_send_ioctx *ioctx,
|
|
enum srpt_command_state old,
|
|
enum srpt_command_state new)
|
|
{
|
|
enum srpt_command_state previous;
|
|
|
|
WARN_ON(!ioctx);
|
|
WARN_ON(old == SRPT_STATE_DONE);
|
|
WARN_ON(new == SRPT_STATE_NEW);
|
|
|
|
previous = ioctx->state;
|
|
if (previous == old)
|
|
ioctx->state = new;
|
|
|
|
return previous == old;
|
|
}
|
|
|
|
/**
|
|
* srpt_post_recv - post an IB receive request
|
|
* @sdev: SRPT HCA pointer.
|
|
* @ch: SRPT RDMA channel.
|
|
* @ioctx: Receive I/O context pointer.
|
|
*/
|
|
static int srpt_post_recv(struct srpt_device *sdev, struct srpt_rdma_ch *ch,
|
|
struct srpt_recv_ioctx *ioctx)
|
|
{
|
|
struct ib_sge list;
|
|
struct ib_recv_wr wr;
|
|
|
|
BUG_ON(!sdev);
|
|
list.addr = ioctx->ioctx.dma + ioctx->ioctx.offset;
|
|
list.length = srp_max_req_size;
|
|
list.lkey = sdev->lkey;
|
|
|
|
ioctx->ioctx.cqe.done = srpt_recv_done;
|
|
wr.wr_cqe = &ioctx->ioctx.cqe;
|
|
wr.next = NULL;
|
|
wr.sg_list = &list;
|
|
wr.num_sge = 1;
|
|
|
|
if (sdev->use_srq)
|
|
return ib_post_srq_recv(sdev->srq, &wr, NULL);
|
|
else
|
|
return ib_post_recv(ch->qp, &wr, NULL);
|
|
}
|
|
|
|
/**
|
|
* srpt_zerolength_write - perform a zero-length RDMA write
|
|
* @ch: SRPT RDMA channel.
|
|
*
|
|
* A quote from the InfiniBand specification: C9-88: For an HCA responder
|
|
* using Reliable Connection service, for each zero-length RDMA READ or WRITE
|
|
* request, the R_Key shall not be validated, even if the request includes
|
|
* Immediate data.
|
|
*/
|
|
static int srpt_zerolength_write(struct srpt_rdma_ch *ch)
|
|
{
|
|
struct ib_rdma_wr wr = {
|
|
.wr = {
|
|
.next = NULL,
|
|
{ .wr_cqe = &ch->zw_cqe, },
|
|
.opcode = IB_WR_RDMA_WRITE,
|
|
.send_flags = IB_SEND_SIGNALED,
|
|
}
|
|
};
|
|
|
|
pr_debug("%s-%d: queued zerolength write\n", ch->sess_name,
|
|
ch->qp->qp_num);
|
|
|
|
return ib_post_send(ch->qp, &wr.wr, NULL);
|
|
}
|
|
|
|
static void srpt_zerolength_write_done(struct ib_cq *cq, struct ib_wc *wc)
|
|
{
|
|
struct srpt_rdma_ch *ch = wc->qp->qp_context;
|
|
|
|
pr_debug("%s-%d wc->status %d\n", ch->sess_name, ch->qp->qp_num,
|
|
wc->status);
|
|
|
|
if (wc->status == IB_WC_SUCCESS) {
|
|
srpt_process_wait_list(ch);
|
|
} else {
|
|
if (srpt_set_ch_state(ch, CH_DISCONNECTED))
|
|
schedule_work(&ch->release_work);
|
|
else
|
|
pr_debug("%s-%d: already disconnected.\n",
|
|
ch->sess_name, ch->qp->qp_num);
|
|
}
|
|
}
|
|
|
|
static int srpt_alloc_rw_ctxs(struct srpt_send_ioctx *ioctx,
|
|
struct srp_direct_buf *db, int nbufs, struct scatterlist **sg,
|
|
unsigned *sg_cnt)
|
|
{
|
|
enum dma_data_direction dir = target_reverse_dma_direction(&ioctx->cmd);
|
|
struct srpt_rdma_ch *ch = ioctx->ch;
|
|
struct scatterlist *prev = NULL;
|
|
unsigned prev_nents;
|
|
int ret, i;
|
|
|
|
if (nbufs == 1) {
|
|
ioctx->rw_ctxs = &ioctx->s_rw_ctx;
|
|
} else {
|
|
ioctx->rw_ctxs = kmalloc_array(nbufs, sizeof(*ioctx->rw_ctxs),
|
|
GFP_KERNEL);
|
|
if (!ioctx->rw_ctxs)
|
|
return -ENOMEM;
|
|
}
|
|
|
|
for (i = ioctx->n_rw_ctx; i < nbufs; i++, db++) {
|
|
struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i];
|
|
u64 remote_addr = be64_to_cpu(db->va);
|
|
u32 size = be32_to_cpu(db->len);
|
|
u32 rkey = be32_to_cpu(db->key);
|
|
|
|
ret = target_alloc_sgl(&ctx->sg, &ctx->nents, size, false,
|
|
i < nbufs - 1);
|
|
if (ret)
|
|
goto unwind;
|
|
|
|
ret = rdma_rw_ctx_init(&ctx->rw, ch->qp, ch->sport->port,
|
|
ctx->sg, ctx->nents, 0, remote_addr, rkey, dir);
|
|
if (ret < 0) {
|
|
target_free_sgl(ctx->sg, ctx->nents);
|
|
goto unwind;
|
|
}
|
|
|
|
ioctx->n_rdma += ret;
|
|
ioctx->n_rw_ctx++;
|
|
|
|
if (prev) {
|
|
sg_unmark_end(&prev[prev_nents - 1]);
|
|
sg_chain(prev, prev_nents + 1, ctx->sg);
|
|
} else {
|
|
*sg = ctx->sg;
|
|
}
|
|
|
|
prev = ctx->sg;
|
|
prev_nents = ctx->nents;
|
|
|
|
*sg_cnt += ctx->nents;
|
|
}
|
|
|
|
return 0;
|
|
|
|
unwind:
|
|
while (--i >= 0) {
|
|
struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i];
|
|
|
|
rdma_rw_ctx_destroy(&ctx->rw, ch->qp, ch->sport->port,
|
|
ctx->sg, ctx->nents, dir);
|
|
target_free_sgl(ctx->sg, ctx->nents);
|
|
}
|
|
if (ioctx->rw_ctxs != &ioctx->s_rw_ctx)
|
|
kfree(ioctx->rw_ctxs);
|
|
return ret;
|
|
}
|
|
|
|
static void srpt_free_rw_ctxs(struct srpt_rdma_ch *ch,
|
|
struct srpt_send_ioctx *ioctx)
|
|
{
|
|
enum dma_data_direction dir = target_reverse_dma_direction(&ioctx->cmd);
|
|
int i;
|
|
|
|
for (i = 0; i < ioctx->n_rw_ctx; i++) {
|
|
struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i];
|
|
|
|
rdma_rw_ctx_destroy(&ctx->rw, ch->qp, ch->sport->port,
|
|
ctx->sg, ctx->nents, dir);
|
|
target_free_sgl(ctx->sg, ctx->nents);
|
|
}
|
|
|
|
if (ioctx->rw_ctxs != &ioctx->s_rw_ctx)
|
|
kfree(ioctx->rw_ctxs);
|
|
}
|
|
|
|
static inline void *srpt_get_desc_buf(struct srp_cmd *srp_cmd)
|
|
{
|
|
/*
|
|
* The pointer computations below will only be compiled correctly
|
|
* if srp_cmd::add_data is declared as s8*, u8*, s8[] or u8[], so check
|
|
* whether srp_cmd::add_data has been declared as a byte pointer.
|
|
*/
|
|
BUILD_BUG_ON(!__same_type(srp_cmd->add_data[0], (s8)0) &&
|
|
!__same_type(srp_cmd->add_data[0], (u8)0));
|
|
|
|
/*
|
|
* According to the SRP spec, the lower two bits of the 'ADDITIONAL
|
|
* CDB LENGTH' field are reserved and the size in bytes of this field
|
|
* is four times the value specified in bits 3..7. Hence the "& ~3".
|
|
*/
|
|
return srp_cmd->add_data + (srp_cmd->add_cdb_len & ~3);
|
|
}
|
|
|
|
/**
|
|
* srpt_get_desc_tbl - parse the data descriptors of a SRP_CMD request
|
|
* @recv_ioctx: I/O context associated with the received command @srp_cmd.
|
|
* @ioctx: I/O context that will be used for responding to the initiator.
|
|
* @srp_cmd: Pointer to the SRP_CMD request data.
|
|
* @dir: Pointer to the variable to which the transfer direction will be
|
|
* written.
|
|
* @sg: [out] scatterlist for the parsed SRP_CMD.
|
|
* @sg_cnt: [out] length of @sg.
|
|
* @data_len: Pointer to the variable to which the total data length of all
|
|
* descriptors in the SRP_CMD request will be written.
|
|
* @imm_data_offset: [in] Offset in SRP_CMD requests at which immediate data
|
|
* starts.
|
|
*
|
|
* This function initializes ioctx->nrbuf and ioctx->r_bufs.
|
|
*
|
|
* Returns -EINVAL when the SRP_CMD request contains inconsistent descriptors;
|
|
* -ENOMEM when memory allocation fails and zero upon success.
|
|
*/
|
|
static int srpt_get_desc_tbl(struct srpt_recv_ioctx *recv_ioctx,
|
|
struct srpt_send_ioctx *ioctx,
|
|
struct srp_cmd *srp_cmd, enum dma_data_direction *dir,
|
|
struct scatterlist **sg, unsigned int *sg_cnt, u64 *data_len,
|
|
u16 imm_data_offset)
|
|
{
|
|
BUG_ON(!dir);
|
|
BUG_ON(!data_len);
|
|
|
|
/*
|
|
* The lower four bits of the buffer format field contain the DATA-IN
|
|
* buffer descriptor format, and the highest four bits contain the
|
|
* DATA-OUT buffer descriptor format.
|
|
*/
|
|
if (srp_cmd->buf_fmt & 0xf)
|
|
/* DATA-IN: transfer data from target to initiator (read). */
|
|
*dir = DMA_FROM_DEVICE;
|
|
else if (srp_cmd->buf_fmt >> 4)
|
|
/* DATA-OUT: transfer data from initiator to target (write). */
|
|
*dir = DMA_TO_DEVICE;
|
|
else
|
|
*dir = DMA_NONE;
|
|
|
|
/* initialize data_direction early as srpt_alloc_rw_ctxs needs it */
|
|
ioctx->cmd.data_direction = *dir;
|
|
|
|
if (((srp_cmd->buf_fmt & 0xf) == SRP_DATA_DESC_DIRECT) ||
|
|
((srp_cmd->buf_fmt >> 4) == SRP_DATA_DESC_DIRECT)) {
|
|
struct srp_direct_buf *db = srpt_get_desc_buf(srp_cmd);
|
|
|
|
*data_len = be32_to_cpu(db->len);
|
|
return srpt_alloc_rw_ctxs(ioctx, db, 1, sg, sg_cnt);
|
|
} else if (((srp_cmd->buf_fmt & 0xf) == SRP_DATA_DESC_INDIRECT) ||
|
|
((srp_cmd->buf_fmt >> 4) == SRP_DATA_DESC_INDIRECT)) {
|
|
struct srp_indirect_buf *idb = srpt_get_desc_buf(srp_cmd);
|
|
int nbufs = be32_to_cpu(idb->table_desc.len) /
|
|
sizeof(struct srp_direct_buf);
|
|
|
|
if (nbufs >
|
|
(srp_cmd->data_out_desc_cnt + srp_cmd->data_in_desc_cnt)) {
|
|
pr_err("received unsupported SRP_CMD request type (%u out + %u in != %u / %zu)\n",
|
|
srp_cmd->data_out_desc_cnt,
|
|
srp_cmd->data_in_desc_cnt,
|
|
be32_to_cpu(idb->table_desc.len),
|
|
sizeof(struct srp_direct_buf));
|
|
return -EINVAL;
|
|
}
|
|
|
|
*data_len = be32_to_cpu(idb->len);
|
|
return srpt_alloc_rw_ctxs(ioctx, idb->desc_list, nbufs,
|
|
sg, sg_cnt);
|
|
} else if ((srp_cmd->buf_fmt >> 4) == SRP_DATA_DESC_IMM) {
|
|
struct srp_imm_buf *imm_buf = srpt_get_desc_buf(srp_cmd);
|
|
void *data = (void *)srp_cmd + imm_data_offset;
|
|
uint32_t len = be32_to_cpu(imm_buf->len);
|
|
uint32_t req_size = imm_data_offset + len;
|
|
|
|
if (req_size > srp_max_req_size) {
|
|
pr_err("Immediate data (length %d + %d) exceeds request size %d\n",
|
|
imm_data_offset, len, srp_max_req_size);
|
|
return -EINVAL;
|
|
}
|
|
if (recv_ioctx->byte_len < req_size) {
|
|
pr_err("Received too few data - %d < %d\n",
|
|
recv_ioctx->byte_len, req_size);
|
|
return -EIO;
|
|
}
|
|
/*
|
|
* The immediate data buffer descriptor must occur before the
|
|
* immediate data itself.
|
|
*/
|
|
if ((void *)(imm_buf + 1) > (void *)data) {
|
|
pr_err("Received invalid write request\n");
|
|
return -EINVAL;
|
|
}
|
|
*data_len = len;
|
|
ioctx->recv_ioctx = recv_ioctx;
|
|
if ((uintptr_t)data & 511) {
|
|
pr_warn_once("Internal error - the receive buffers are not aligned properly.\n");
|
|
return -EINVAL;
|
|
}
|
|
sg_init_one(&ioctx->imm_sg, data, len);
|
|
*sg = &ioctx->imm_sg;
|
|
*sg_cnt = 1;
|
|
return 0;
|
|
} else {
|
|
*data_len = 0;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* srpt_init_ch_qp - initialize queue pair attributes
|
|
* @ch: SRPT RDMA channel.
|
|
* @qp: Queue pair pointer.
|
|
*
|
|
* Initialized the attributes of queue pair 'qp' by allowing local write,
|
|
* remote read and remote write. Also transitions 'qp' to state IB_QPS_INIT.
|
|
*/
|
|
static int srpt_init_ch_qp(struct srpt_rdma_ch *ch, struct ib_qp *qp)
|
|
{
|
|
struct ib_qp_attr *attr;
|
|
int ret;
|
|
|
|
WARN_ON_ONCE(ch->using_rdma_cm);
|
|
|
|
attr = kzalloc(sizeof(*attr), GFP_KERNEL);
|
|
if (!attr)
|
|
return -ENOMEM;
|
|
|
|
attr->qp_state = IB_QPS_INIT;
|
|
attr->qp_access_flags = IB_ACCESS_LOCAL_WRITE;
|
|
attr->port_num = ch->sport->port;
|
|
|
|
ret = ib_find_cached_pkey(ch->sport->sdev->device, ch->sport->port,
|
|
ch->pkey, &attr->pkey_index);
|
|
if (ret < 0)
|
|
pr_err("Translating pkey %#x failed (%d) - using index 0\n",
|
|
ch->pkey, ret);
|
|
|
|
ret = ib_modify_qp(qp, attr,
|
|
IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PORT |
|
|
IB_QP_PKEY_INDEX);
|
|
|
|
kfree(attr);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* srpt_ch_qp_rtr - change the state of a channel to 'ready to receive' (RTR)
|
|
* @ch: channel of the queue pair.
|
|
* @qp: queue pair to change the state of.
|
|
*
|
|
* Returns zero upon success and a negative value upon failure.
|
|
*
|
|
* Note: currently a struct ib_qp_attr takes 136 bytes on a 64-bit system.
|
|
* If this structure ever becomes larger, it might be necessary to allocate
|
|
* it dynamically instead of on the stack.
|
|
*/
|
|
static int srpt_ch_qp_rtr(struct srpt_rdma_ch *ch, struct ib_qp *qp)
|
|
{
|
|
struct ib_qp_attr qp_attr;
|
|
int attr_mask;
|
|
int ret;
|
|
|
|
WARN_ON_ONCE(ch->using_rdma_cm);
|
|
|
|
qp_attr.qp_state = IB_QPS_RTR;
|
|
ret = ib_cm_init_qp_attr(ch->ib_cm.cm_id, &qp_attr, &attr_mask);
|
|
if (ret)
|
|
goto out;
|
|
|
|
qp_attr.max_dest_rd_atomic = 4;
|
|
|
|
ret = ib_modify_qp(qp, &qp_attr, attr_mask);
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* srpt_ch_qp_rts - change the state of a channel to 'ready to send' (RTS)
|
|
* @ch: channel of the queue pair.
|
|
* @qp: queue pair to change the state of.
|
|
*
|
|
* Returns zero upon success and a negative value upon failure.
|
|
*
|
|
* Note: currently a struct ib_qp_attr takes 136 bytes on a 64-bit system.
|
|
* If this structure ever becomes larger, it might be necessary to allocate
|
|
* it dynamically instead of on the stack.
|
|
*/
|
|
static int srpt_ch_qp_rts(struct srpt_rdma_ch *ch, struct ib_qp *qp)
|
|
{
|
|
struct ib_qp_attr qp_attr;
|
|
int attr_mask;
|
|
int ret;
|
|
|
|
qp_attr.qp_state = IB_QPS_RTS;
|
|
ret = ib_cm_init_qp_attr(ch->ib_cm.cm_id, &qp_attr, &attr_mask);
|
|
if (ret)
|
|
goto out;
|
|
|
|
qp_attr.max_rd_atomic = 4;
|
|
|
|
ret = ib_modify_qp(qp, &qp_attr, attr_mask);
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* srpt_ch_qp_err - set the channel queue pair state to 'error'
|
|
* @ch: SRPT RDMA channel.
|
|
*/
|
|
static int srpt_ch_qp_err(struct srpt_rdma_ch *ch)
|
|
{
|
|
struct ib_qp_attr qp_attr;
|
|
|
|
qp_attr.qp_state = IB_QPS_ERR;
|
|
return ib_modify_qp(ch->qp, &qp_attr, IB_QP_STATE);
|
|
}
|
|
|
|
/**
|
|
* srpt_get_send_ioctx - obtain an I/O context for sending to the initiator
|
|
* @ch: SRPT RDMA channel.
|
|
*/
|
|
static struct srpt_send_ioctx *srpt_get_send_ioctx(struct srpt_rdma_ch *ch)
|
|
{
|
|
struct srpt_send_ioctx *ioctx;
|
|
int tag, cpu;
|
|
|
|
BUG_ON(!ch);
|
|
|
|
tag = sbitmap_queue_get(&ch->sess->sess_tag_pool, &cpu);
|
|
if (tag < 0)
|
|
return NULL;
|
|
|
|
ioctx = ch->ioctx_ring[tag];
|
|
BUG_ON(ioctx->ch != ch);
|
|
ioctx->state = SRPT_STATE_NEW;
|
|
WARN_ON_ONCE(ioctx->recv_ioctx);
|
|
ioctx->n_rdma = 0;
|
|
ioctx->n_rw_ctx = 0;
|
|
ioctx->queue_status_only = false;
|
|
/*
|
|
* transport_init_se_cmd() does not initialize all fields, so do it
|
|
* here.
|
|
*/
|
|
memset(&ioctx->cmd, 0, sizeof(ioctx->cmd));
|
|
memset(&ioctx->sense_data, 0, sizeof(ioctx->sense_data));
|
|
ioctx->cmd.map_tag = tag;
|
|
ioctx->cmd.map_cpu = cpu;
|
|
|
|
return ioctx;
|
|
}
|
|
|
|
/**
|
|
* srpt_abort_cmd - abort a SCSI command
|
|
* @ioctx: I/O context associated with the SCSI command.
|
|
*/
|
|
static int srpt_abort_cmd(struct srpt_send_ioctx *ioctx)
|
|
{
|
|
enum srpt_command_state state;
|
|
|
|
BUG_ON(!ioctx);
|
|
|
|
/*
|
|
* If the command is in a state where the target core is waiting for
|
|
* the ib_srpt driver, change the state to the next state.
|
|
*/
|
|
|
|
state = ioctx->state;
|
|
switch (state) {
|
|
case SRPT_STATE_NEED_DATA:
|
|
ioctx->state = SRPT_STATE_DATA_IN;
|
|
break;
|
|
case SRPT_STATE_CMD_RSP_SENT:
|
|
case SRPT_STATE_MGMT_RSP_SENT:
|
|
ioctx->state = SRPT_STATE_DONE;
|
|
break;
|
|
default:
|
|
WARN_ONCE(true, "%s: unexpected I/O context state %d\n",
|
|
__func__, state);
|
|
break;
|
|
}
|
|
|
|
pr_debug("Aborting cmd with state %d -> %d and tag %lld\n", state,
|
|
ioctx->state, ioctx->cmd.tag);
|
|
|
|
switch (state) {
|
|
case SRPT_STATE_NEW:
|
|
case SRPT_STATE_DATA_IN:
|
|
case SRPT_STATE_MGMT:
|
|
case SRPT_STATE_DONE:
|
|
/*
|
|
* Do nothing - defer abort processing until
|
|
* srpt_queue_response() is invoked.
|
|
*/
|
|
break;
|
|
case SRPT_STATE_NEED_DATA:
|
|
pr_debug("tag %#llx: RDMA read error\n", ioctx->cmd.tag);
|
|
transport_generic_request_failure(&ioctx->cmd,
|
|
TCM_CHECK_CONDITION_ABORT_CMD);
|
|
break;
|
|
case SRPT_STATE_CMD_RSP_SENT:
|
|
/*
|
|
* SRP_RSP sending failed or the SRP_RSP send completion has
|
|
* not been received in time.
|
|
*/
|
|
transport_generic_free_cmd(&ioctx->cmd, 0);
|
|
break;
|
|
case SRPT_STATE_MGMT_RSP_SENT:
|
|
transport_generic_free_cmd(&ioctx->cmd, 0);
|
|
break;
|
|
default:
|
|
WARN(1, "Unexpected command state (%d)", state);
|
|
break;
|
|
}
|
|
|
|
return state;
|
|
}
|
|
|
|
/**
|
|
* srpt_rdma_read_done - RDMA read completion callback
|
|
* @cq: Completion queue.
|
|
* @wc: Work completion.
|
|
*
|
|
* XXX: what is now target_execute_cmd used to be asynchronous, and unmapping
|
|
* the data that has been transferred via IB RDMA had to be postponed until the
|
|
* check_stop_free() callback. None of this is necessary anymore and needs to
|
|
* be cleaned up.
|
|
*/
|
|
static void srpt_rdma_read_done(struct ib_cq *cq, struct ib_wc *wc)
|
|
{
|
|
struct srpt_rdma_ch *ch = wc->qp->qp_context;
|
|
struct srpt_send_ioctx *ioctx =
|
|
container_of(wc->wr_cqe, struct srpt_send_ioctx, rdma_cqe);
|
|
|
|
WARN_ON(ioctx->n_rdma <= 0);
|
|
atomic_add(ioctx->n_rdma, &ch->sq_wr_avail);
|
|
ioctx->n_rdma = 0;
|
|
|
|
if (unlikely(wc->status != IB_WC_SUCCESS)) {
|
|
pr_info("RDMA_READ for ioctx 0x%p failed with status %d\n",
|
|
ioctx, wc->status);
|
|
srpt_abort_cmd(ioctx);
|
|
return;
|
|
}
|
|
|
|
if (srpt_test_and_set_cmd_state(ioctx, SRPT_STATE_NEED_DATA,
|
|
SRPT_STATE_DATA_IN))
|
|
target_execute_cmd(&ioctx->cmd);
|
|
else
|
|
pr_err("%s[%d]: wrong state = %d\n", __func__,
|
|
__LINE__, ioctx->state);
|
|
}
|
|
|
|
/**
|
|
* srpt_build_cmd_rsp - build a SRP_RSP response
|
|
* @ch: RDMA channel through which the request has been received.
|
|
* @ioctx: I/O context associated with the SRP_CMD request. The response will
|
|
* be built in the buffer ioctx->buf points at and hence this function will
|
|
* overwrite the request data.
|
|
* @tag: tag of the request for which this response is being generated.
|
|
* @status: value for the STATUS field of the SRP_RSP information unit.
|
|
*
|
|
* Returns the size in bytes of the SRP_RSP response.
|
|
*
|
|
* An SRP_RSP response contains a SCSI status or service response. See also
|
|
* section 6.9 in the SRP r16a document for the format of an SRP_RSP
|
|
* response. See also SPC-2 for more information about sense data.
|
|
*/
|
|
static int srpt_build_cmd_rsp(struct srpt_rdma_ch *ch,
|
|
struct srpt_send_ioctx *ioctx, u64 tag,
|
|
int status)
|
|
{
|
|
struct se_cmd *cmd = &ioctx->cmd;
|
|
struct srp_rsp *srp_rsp;
|
|
const u8 *sense_data;
|
|
int sense_data_len, max_sense_len;
|
|
u32 resid = cmd->residual_count;
|
|
|
|
/*
|
|
* The lowest bit of all SAM-3 status codes is zero (see also
|
|
* paragraph 5.3 in SAM-3).
|
|
*/
|
|
WARN_ON(status & 1);
|
|
|
|
srp_rsp = ioctx->ioctx.buf;
|
|
BUG_ON(!srp_rsp);
|
|
|
|
sense_data = ioctx->sense_data;
|
|
sense_data_len = ioctx->cmd.scsi_sense_length;
|
|
WARN_ON(sense_data_len > sizeof(ioctx->sense_data));
|
|
|
|
memset(srp_rsp, 0, sizeof(*srp_rsp));
|
|
srp_rsp->opcode = SRP_RSP;
|
|
srp_rsp->req_lim_delta =
|
|
cpu_to_be32(1 + atomic_xchg(&ch->req_lim_delta, 0));
|
|
srp_rsp->tag = tag;
|
|
srp_rsp->status = status;
|
|
|
|
if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) {
|
|
if (cmd->data_direction == DMA_TO_DEVICE) {
|
|
/* residual data from an underflow write */
|
|
srp_rsp->flags = SRP_RSP_FLAG_DOUNDER;
|
|
srp_rsp->data_out_res_cnt = cpu_to_be32(resid);
|
|
} else if (cmd->data_direction == DMA_FROM_DEVICE) {
|
|
/* residual data from an underflow read */
|
|
srp_rsp->flags = SRP_RSP_FLAG_DIUNDER;
|
|
srp_rsp->data_in_res_cnt = cpu_to_be32(resid);
|
|
}
|
|
} else if (cmd->se_cmd_flags & SCF_OVERFLOW_BIT) {
|
|
if (cmd->data_direction == DMA_TO_DEVICE) {
|
|
/* residual data from an overflow write */
|
|
srp_rsp->flags = SRP_RSP_FLAG_DOOVER;
|
|
srp_rsp->data_out_res_cnt = cpu_to_be32(resid);
|
|
} else if (cmd->data_direction == DMA_FROM_DEVICE) {
|
|
/* residual data from an overflow read */
|
|
srp_rsp->flags = SRP_RSP_FLAG_DIOVER;
|
|
srp_rsp->data_in_res_cnt = cpu_to_be32(resid);
|
|
}
|
|
}
|
|
|
|
if (sense_data_len) {
|
|
BUILD_BUG_ON(MIN_MAX_RSP_SIZE <= sizeof(*srp_rsp));
|
|
max_sense_len = ch->max_ti_iu_len - sizeof(*srp_rsp);
|
|
if (sense_data_len > max_sense_len) {
|
|
pr_warn("truncated sense data from %d to %d bytes\n",
|
|
sense_data_len, max_sense_len);
|
|
sense_data_len = max_sense_len;
|
|
}
|
|
|
|
srp_rsp->flags |= SRP_RSP_FLAG_SNSVALID;
|
|
srp_rsp->sense_data_len = cpu_to_be32(sense_data_len);
|
|
memcpy(srp_rsp->data, sense_data, sense_data_len);
|
|
}
|
|
|
|
return sizeof(*srp_rsp) + sense_data_len;
|
|
}
|
|
|
|
/**
|
|
* srpt_build_tskmgmt_rsp - build a task management response
|
|
* @ch: RDMA channel through which the request has been received.
|
|
* @ioctx: I/O context in which the SRP_RSP response will be built.
|
|
* @rsp_code: RSP_CODE that will be stored in the response.
|
|
* @tag: Tag of the request for which this response is being generated.
|
|
*
|
|
* Returns the size in bytes of the SRP_RSP response.
|
|
*
|
|
* An SRP_RSP response contains a SCSI status or service response. See also
|
|
* section 6.9 in the SRP r16a document for the format of an SRP_RSP
|
|
* response.
|
|
*/
|
|
static int srpt_build_tskmgmt_rsp(struct srpt_rdma_ch *ch,
|
|
struct srpt_send_ioctx *ioctx,
|
|
u8 rsp_code, u64 tag)
|
|
{
|
|
struct srp_rsp *srp_rsp;
|
|
int resp_data_len;
|
|
int resp_len;
|
|
|
|
resp_data_len = 4;
|
|
resp_len = sizeof(*srp_rsp) + resp_data_len;
|
|
|
|
srp_rsp = ioctx->ioctx.buf;
|
|
BUG_ON(!srp_rsp);
|
|
memset(srp_rsp, 0, sizeof(*srp_rsp));
|
|
|
|
srp_rsp->opcode = SRP_RSP;
|
|
srp_rsp->req_lim_delta =
|
|
cpu_to_be32(1 + atomic_xchg(&ch->req_lim_delta, 0));
|
|
srp_rsp->tag = tag;
|
|
|
|
srp_rsp->flags |= SRP_RSP_FLAG_RSPVALID;
|
|
srp_rsp->resp_data_len = cpu_to_be32(resp_data_len);
|
|
srp_rsp->data[3] = rsp_code;
|
|
|
|
return resp_len;
|
|
}
|
|
|
|
static int srpt_check_stop_free(struct se_cmd *cmd)
|
|
{
|
|
struct srpt_send_ioctx *ioctx = container_of(cmd,
|
|
struct srpt_send_ioctx, cmd);
|
|
|
|
return target_put_sess_cmd(&ioctx->cmd);
|
|
}
|
|
|
|
/**
|
|
* srpt_handle_cmd - process a SRP_CMD information unit
|
|
* @ch: SRPT RDMA channel.
|
|
* @recv_ioctx: Receive I/O context.
|
|
* @send_ioctx: Send I/O context.
|
|
*/
|
|
static void srpt_handle_cmd(struct srpt_rdma_ch *ch,
|
|
struct srpt_recv_ioctx *recv_ioctx,
|
|
struct srpt_send_ioctx *send_ioctx)
|
|
{
|
|
struct se_cmd *cmd;
|
|
struct srp_cmd *srp_cmd;
|
|
struct scatterlist *sg = NULL;
|
|
unsigned sg_cnt = 0;
|
|
u64 data_len;
|
|
enum dma_data_direction dir;
|
|
int rc;
|
|
|
|
BUG_ON(!send_ioctx);
|
|
|
|
srp_cmd = recv_ioctx->ioctx.buf + recv_ioctx->ioctx.offset;
|
|
cmd = &send_ioctx->cmd;
|
|
cmd->tag = srp_cmd->tag;
|
|
|
|
switch (srp_cmd->task_attr) {
|
|
case SRP_CMD_SIMPLE_Q:
|
|
cmd->sam_task_attr = TCM_SIMPLE_TAG;
|
|
break;
|
|
case SRP_CMD_ORDERED_Q:
|
|
default:
|
|
cmd->sam_task_attr = TCM_ORDERED_TAG;
|
|
break;
|
|
case SRP_CMD_HEAD_OF_Q:
|
|
cmd->sam_task_attr = TCM_HEAD_TAG;
|
|
break;
|
|
case SRP_CMD_ACA:
|
|
cmd->sam_task_attr = TCM_ACA_TAG;
|
|
break;
|
|
}
|
|
|
|
rc = srpt_get_desc_tbl(recv_ioctx, send_ioctx, srp_cmd, &dir,
|
|
&sg, &sg_cnt, &data_len, ch->imm_data_offset);
|
|
if (rc) {
|
|
if (rc != -EAGAIN) {
|
|
pr_err("0x%llx: parsing SRP descriptor table failed.\n",
|
|
srp_cmd->tag);
|
|
}
|
|
goto busy;
|
|
}
|
|
|
|
rc = target_init_cmd(cmd, ch->sess, &send_ioctx->sense_data[0],
|
|
scsilun_to_int(&srp_cmd->lun), data_len,
|
|
TCM_SIMPLE_TAG, dir, TARGET_SCF_ACK_KREF);
|
|
if (rc != 0) {
|
|
pr_debug("target_submit_cmd() returned %d for tag %#llx\n", rc,
|
|
srp_cmd->tag);
|
|
goto busy;
|
|
}
|
|
|
|
if (target_submit_prep(cmd, srp_cmd->cdb, sg, sg_cnt, NULL, 0, NULL, 0,
|
|
GFP_KERNEL))
|
|
return;
|
|
|
|
target_submit(cmd);
|
|
return;
|
|
|
|
busy:
|
|
target_send_busy(cmd);
|
|
}
|
|
|
|
static int srp_tmr_to_tcm(int fn)
|
|
{
|
|
switch (fn) {
|
|
case SRP_TSK_ABORT_TASK:
|
|
return TMR_ABORT_TASK;
|
|
case SRP_TSK_ABORT_TASK_SET:
|
|
return TMR_ABORT_TASK_SET;
|
|
case SRP_TSK_CLEAR_TASK_SET:
|
|
return TMR_CLEAR_TASK_SET;
|
|
case SRP_TSK_LUN_RESET:
|
|
return TMR_LUN_RESET;
|
|
case SRP_TSK_CLEAR_ACA:
|
|
return TMR_CLEAR_ACA;
|
|
default:
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* srpt_handle_tsk_mgmt - process a SRP_TSK_MGMT information unit
|
|
* @ch: SRPT RDMA channel.
|
|
* @recv_ioctx: Receive I/O context.
|
|
* @send_ioctx: Send I/O context.
|
|
*
|
|
* Returns 0 if and only if the request will be processed by the target core.
|
|
*
|
|
* For more information about SRP_TSK_MGMT information units, see also section
|
|
* 6.7 in the SRP r16a document.
|
|
*/
|
|
static void srpt_handle_tsk_mgmt(struct srpt_rdma_ch *ch,
|
|
struct srpt_recv_ioctx *recv_ioctx,
|
|
struct srpt_send_ioctx *send_ioctx)
|
|
{
|
|
struct srp_tsk_mgmt *srp_tsk;
|
|
struct se_cmd *cmd;
|
|
struct se_session *sess = ch->sess;
|
|
int tcm_tmr;
|
|
int rc;
|
|
|
|
BUG_ON(!send_ioctx);
|
|
|
|
srp_tsk = recv_ioctx->ioctx.buf + recv_ioctx->ioctx.offset;
|
|
cmd = &send_ioctx->cmd;
|
|
|
|
pr_debug("recv tsk_mgmt fn %d for task_tag %lld and cmd tag %lld ch %p sess %p\n",
|
|
srp_tsk->tsk_mgmt_func, srp_tsk->task_tag, srp_tsk->tag, ch,
|
|
ch->sess);
|
|
|
|
srpt_set_cmd_state(send_ioctx, SRPT_STATE_MGMT);
|
|
send_ioctx->cmd.tag = srp_tsk->tag;
|
|
tcm_tmr = srp_tmr_to_tcm(srp_tsk->tsk_mgmt_func);
|
|
rc = target_submit_tmr(&send_ioctx->cmd, sess, NULL,
|
|
scsilun_to_int(&srp_tsk->lun), srp_tsk, tcm_tmr,
|
|
GFP_KERNEL, srp_tsk->task_tag,
|
|
TARGET_SCF_ACK_KREF);
|
|
if (rc != 0) {
|
|
send_ioctx->cmd.se_tmr_req->response = TMR_FUNCTION_REJECTED;
|
|
cmd->se_tfo->queue_tm_rsp(cmd);
|
|
}
|
|
return;
|
|
}
|
|
|
|
/**
|
|
* srpt_handle_new_iu - process a newly received information unit
|
|
* @ch: RDMA channel through which the information unit has been received.
|
|
* @recv_ioctx: Receive I/O context associated with the information unit.
|
|
*/
|
|
static bool
|
|
srpt_handle_new_iu(struct srpt_rdma_ch *ch, struct srpt_recv_ioctx *recv_ioctx)
|
|
{
|
|
struct srpt_send_ioctx *send_ioctx = NULL;
|
|
struct srp_cmd *srp_cmd;
|
|
bool res = false;
|
|
u8 opcode;
|
|
|
|
BUG_ON(!ch);
|
|
BUG_ON(!recv_ioctx);
|
|
|
|
if (unlikely(ch->state == CH_CONNECTING))
|
|
goto push;
|
|
|
|
ib_dma_sync_single_for_cpu(ch->sport->sdev->device,
|
|
recv_ioctx->ioctx.dma,
|
|
recv_ioctx->ioctx.offset + srp_max_req_size,
|
|
DMA_FROM_DEVICE);
|
|
|
|
srp_cmd = recv_ioctx->ioctx.buf + recv_ioctx->ioctx.offset;
|
|
opcode = srp_cmd->opcode;
|
|
if (opcode == SRP_CMD || opcode == SRP_TSK_MGMT) {
|
|
send_ioctx = srpt_get_send_ioctx(ch);
|
|
if (unlikely(!send_ioctx))
|
|
goto push;
|
|
}
|
|
|
|
if (!list_empty(&recv_ioctx->wait_list)) {
|
|
WARN_ON_ONCE(!ch->processing_wait_list);
|
|
list_del_init(&recv_ioctx->wait_list);
|
|
}
|
|
|
|
switch (opcode) {
|
|
case SRP_CMD:
|
|
srpt_handle_cmd(ch, recv_ioctx, send_ioctx);
|
|
break;
|
|
case SRP_TSK_MGMT:
|
|
srpt_handle_tsk_mgmt(ch, recv_ioctx, send_ioctx);
|
|
break;
|
|
case SRP_I_LOGOUT:
|
|
pr_err("Not yet implemented: SRP_I_LOGOUT\n");
|
|
break;
|
|
case SRP_CRED_RSP:
|
|
pr_debug("received SRP_CRED_RSP\n");
|
|
break;
|
|
case SRP_AER_RSP:
|
|
pr_debug("received SRP_AER_RSP\n");
|
|
break;
|
|
case SRP_RSP:
|
|
pr_err("Received SRP_RSP\n");
|
|
break;
|
|
default:
|
|
pr_err("received IU with unknown opcode 0x%x\n", opcode);
|
|
break;
|
|
}
|
|
|
|
if (!send_ioctx || !send_ioctx->recv_ioctx)
|
|
srpt_post_recv(ch->sport->sdev, ch, recv_ioctx);
|
|
res = true;
|
|
|
|
out:
|
|
return res;
|
|
|
|
push:
|
|
if (list_empty(&recv_ioctx->wait_list)) {
|
|
WARN_ON_ONCE(ch->processing_wait_list);
|
|
list_add_tail(&recv_ioctx->wait_list, &ch->cmd_wait_list);
|
|
}
|
|
goto out;
|
|
}
|
|
|
|
static void srpt_recv_done(struct ib_cq *cq, struct ib_wc *wc)
|
|
{
|
|
struct srpt_rdma_ch *ch = wc->qp->qp_context;
|
|
struct srpt_recv_ioctx *ioctx =
|
|
container_of(wc->wr_cqe, struct srpt_recv_ioctx, ioctx.cqe);
|
|
|
|
if (wc->status == IB_WC_SUCCESS) {
|
|
int req_lim;
|
|
|
|
req_lim = atomic_dec_return(&ch->req_lim);
|
|
if (unlikely(req_lim < 0))
|
|
pr_err("req_lim = %d < 0\n", req_lim);
|
|
ioctx->byte_len = wc->byte_len;
|
|
srpt_handle_new_iu(ch, ioctx);
|
|
} else {
|
|
pr_info_ratelimited("receiving failed for ioctx %p with status %d\n",
|
|
ioctx, wc->status);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* This function must be called from the context in which RDMA completions are
|
|
* processed because it accesses the wait list without protection against
|
|
* access from other threads.
|
|
*/
|
|
static void srpt_process_wait_list(struct srpt_rdma_ch *ch)
|
|
{
|
|
struct srpt_recv_ioctx *recv_ioctx, *tmp;
|
|
|
|
WARN_ON_ONCE(ch->state == CH_CONNECTING);
|
|
|
|
if (list_empty(&ch->cmd_wait_list))
|
|
return;
|
|
|
|
WARN_ON_ONCE(ch->processing_wait_list);
|
|
ch->processing_wait_list = true;
|
|
list_for_each_entry_safe(recv_ioctx, tmp, &ch->cmd_wait_list,
|
|
wait_list) {
|
|
if (!srpt_handle_new_iu(ch, recv_ioctx))
|
|
break;
|
|
}
|
|
ch->processing_wait_list = false;
|
|
}
|
|
|
|
/**
|
|
* srpt_send_done - send completion callback
|
|
* @cq: Completion queue.
|
|
* @wc: Work completion.
|
|
*
|
|
* Note: Although this has not yet been observed during tests, at least in
|
|
* theory it is possible that the srpt_get_send_ioctx() call invoked by
|
|
* srpt_handle_new_iu() fails. This is possible because the req_lim_delta
|
|
* value in each response is set to one, and it is possible that this response
|
|
* makes the initiator send a new request before the send completion for that
|
|
* response has been processed. This could e.g. happen if the call to
|
|
* srpt_put_send_iotcx() is delayed because of a higher priority interrupt or
|
|
* if IB retransmission causes generation of the send completion to be
|
|
* delayed. Incoming information units for which srpt_get_send_ioctx() fails
|
|
* are queued on cmd_wait_list. The code below processes these delayed
|
|
* requests one at a time.
|
|
*/
|
|
static void srpt_send_done(struct ib_cq *cq, struct ib_wc *wc)
|
|
{
|
|
struct srpt_rdma_ch *ch = wc->qp->qp_context;
|
|
struct srpt_send_ioctx *ioctx =
|
|
container_of(wc->wr_cqe, struct srpt_send_ioctx, ioctx.cqe);
|
|
enum srpt_command_state state;
|
|
|
|
state = srpt_set_cmd_state(ioctx, SRPT_STATE_DONE);
|
|
|
|
WARN_ON(state != SRPT_STATE_CMD_RSP_SENT &&
|
|
state != SRPT_STATE_MGMT_RSP_SENT);
|
|
|
|
atomic_add(1 + ioctx->n_rdma, &ch->sq_wr_avail);
|
|
|
|
if (wc->status != IB_WC_SUCCESS)
|
|
pr_info("sending response for ioctx 0x%p failed with status %d\n",
|
|
ioctx, wc->status);
|
|
|
|
if (state != SRPT_STATE_DONE) {
|
|
transport_generic_free_cmd(&ioctx->cmd, 0);
|
|
} else {
|
|
pr_err("IB completion has been received too late for wr_id = %u.\n",
|
|
ioctx->ioctx.index);
|
|
}
|
|
|
|
srpt_process_wait_list(ch);
|
|
}
|
|
|
|
/**
|
|
* srpt_create_ch_ib - create receive and send completion queues
|
|
* @ch: SRPT RDMA channel.
|
|
*/
|
|
static int srpt_create_ch_ib(struct srpt_rdma_ch *ch)
|
|
{
|
|
struct ib_qp_init_attr *qp_init;
|
|
struct srpt_port *sport = ch->sport;
|
|
struct srpt_device *sdev = sport->sdev;
|
|
const struct ib_device_attr *attrs = &sdev->device->attrs;
|
|
int sq_size = sport->port_attrib.srp_sq_size;
|
|
int i, ret;
|
|
|
|
WARN_ON(ch->rq_size < 1);
|
|
|
|
ret = -ENOMEM;
|
|
qp_init = kzalloc(sizeof(*qp_init), GFP_KERNEL);
|
|
if (!qp_init)
|
|
goto out;
|
|
|
|
retry:
|
|
ch->cq = ib_cq_pool_get(sdev->device, ch->rq_size + sq_size, -1,
|
|
IB_POLL_WORKQUEUE);
|
|
if (IS_ERR(ch->cq)) {
|
|
ret = PTR_ERR(ch->cq);
|
|
pr_err("failed to create CQ cqe= %d ret= %d\n",
|
|
ch->rq_size + sq_size, ret);
|
|
goto out;
|
|
}
|
|
ch->cq_size = ch->rq_size + sq_size;
|
|
|
|
qp_init->qp_context = (void *)ch;
|
|
qp_init->event_handler
|
|
= (void(*)(struct ib_event *, void*))srpt_qp_event;
|
|
qp_init->send_cq = ch->cq;
|
|
qp_init->recv_cq = ch->cq;
|
|
qp_init->sq_sig_type = IB_SIGNAL_REQ_WR;
|
|
qp_init->qp_type = IB_QPT_RC;
|
|
/*
|
|
* We divide up our send queue size into half SEND WRs to send the
|
|
* completions, and half R/W contexts to actually do the RDMA
|
|
* READ/WRITE transfers. Note that we need to allocate CQ slots for
|
|
* both both, as RDMA contexts will also post completions for the
|
|
* RDMA READ case.
|
|
*/
|
|
qp_init->cap.max_send_wr = min(sq_size / 2, attrs->max_qp_wr);
|
|
qp_init->cap.max_rdma_ctxs = sq_size / 2;
|
|
qp_init->cap.max_send_sge = attrs->max_send_sge;
|
|
qp_init->cap.max_recv_sge = 1;
|
|
qp_init->port_num = ch->sport->port;
|
|
if (sdev->use_srq)
|
|
qp_init->srq = sdev->srq;
|
|
else
|
|
qp_init->cap.max_recv_wr = ch->rq_size;
|
|
|
|
if (ch->using_rdma_cm) {
|
|
ret = rdma_create_qp(ch->rdma_cm.cm_id, sdev->pd, qp_init);
|
|
ch->qp = ch->rdma_cm.cm_id->qp;
|
|
} else {
|
|
ch->qp = ib_create_qp(sdev->pd, qp_init);
|
|
if (!IS_ERR(ch->qp)) {
|
|
ret = srpt_init_ch_qp(ch, ch->qp);
|
|
if (ret)
|
|
ib_destroy_qp(ch->qp);
|
|
} else {
|
|
ret = PTR_ERR(ch->qp);
|
|
}
|
|
}
|
|
if (ret) {
|
|
bool retry = sq_size > MIN_SRPT_SQ_SIZE;
|
|
|
|
if (retry) {
|
|
pr_debug("failed to create queue pair with sq_size = %d (%d) - retrying\n",
|
|
sq_size, ret);
|
|
ib_cq_pool_put(ch->cq, ch->cq_size);
|
|
sq_size = max(sq_size / 2, MIN_SRPT_SQ_SIZE);
|
|
goto retry;
|
|
} else {
|
|
pr_err("failed to create queue pair with sq_size = %d (%d)\n",
|
|
sq_size, ret);
|
|
goto err_destroy_cq;
|
|
}
|
|
}
|
|
|
|
atomic_set(&ch->sq_wr_avail, qp_init->cap.max_send_wr);
|
|
|
|
pr_debug("%s: max_cqe= %d max_sge= %d sq_size = %d ch= %p\n",
|
|
__func__, ch->cq->cqe, qp_init->cap.max_send_sge,
|
|
qp_init->cap.max_send_wr, ch);
|
|
|
|
if (!sdev->use_srq)
|
|
for (i = 0; i < ch->rq_size; i++)
|
|
srpt_post_recv(sdev, ch, ch->ioctx_recv_ring[i]);
|
|
|
|
out:
|
|
kfree(qp_init);
|
|
return ret;
|
|
|
|
err_destroy_cq:
|
|
ch->qp = NULL;
|
|
ib_cq_pool_put(ch->cq, ch->cq_size);
|
|
goto out;
|
|
}
|
|
|
|
static void srpt_destroy_ch_ib(struct srpt_rdma_ch *ch)
|
|
{
|
|
ib_destroy_qp(ch->qp);
|
|
ib_cq_pool_put(ch->cq, ch->cq_size);
|
|
}
|
|
|
|
/**
|
|
* srpt_close_ch - close a RDMA channel
|
|
* @ch: SRPT RDMA channel.
|
|
*
|
|
* Make sure all resources associated with the channel will be deallocated at
|
|
* an appropriate time.
|
|
*
|
|
* Returns true if and only if the channel state has been modified into
|
|
* CH_DRAINING.
|
|
*/
|
|
static bool srpt_close_ch(struct srpt_rdma_ch *ch)
|
|
{
|
|
int ret;
|
|
|
|
if (!srpt_set_ch_state(ch, CH_DRAINING)) {
|
|
pr_debug("%s: already closed\n", ch->sess_name);
|
|
return false;
|
|
}
|
|
|
|
kref_get(&ch->kref);
|
|
|
|
ret = srpt_ch_qp_err(ch);
|
|
if (ret < 0)
|
|
pr_err("%s-%d: changing queue pair into error state failed: %d\n",
|
|
ch->sess_name, ch->qp->qp_num, ret);
|
|
|
|
ret = srpt_zerolength_write(ch);
|
|
if (ret < 0) {
|
|
pr_err("%s-%d: queuing zero-length write failed: %d\n",
|
|
ch->sess_name, ch->qp->qp_num, ret);
|
|
if (srpt_set_ch_state(ch, CH_DISCONNECTED))
|
|
schedule_work(&ch->release_work);
|
|
else
|
|
WARN_ON_ONCE(true);
|
|
}
|
|
|
|
kref_put(&ch->kref, srpt_free_ch);
|
|
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* Change the channel state into CH_DISCONNECTING. If a channel has not yet
|
|
* reached the connected state, close it. If a channel is in the connected
|
|
* state, send a DREQ. If a DREQ has been received, send a DREP. Note: it is
|
|
* the responsibility of the caller to ensure that this function is not
|
|
* invoked concurrently with the code that accepts a connection. This means
|
|
* that this function must either be invoked from inside a CM callback
|
|
* function or that it must be invoked with the srpt_port.mutex held.
|
|
*/
|
|
static int srpt_disconnect_ch(struct srpt_rdma_ch *ch)
|
|
{
|
|
int ret;
|
|
|
|
if (!srpt_set_ch_state(ch, CH_DISCONNECTING))
|
|
return -ENOTCONN;
|
|
|
|
if (ch->using_rdma_cm) {
|
|
ret = rdma_disconnect(ch->rdma_cm.cm_id);
|
|
} else {
|
|
ret = ib_send_cm_dreq(ch->ib_cm.cm_id, NULL, 0);
|
|
if (ret < 0)
|
|
ret = ib_send_cm_drep(ch->ib_cm.cm_id, NULL, 0);
|
|
}
|
|
|
|
if (ret < 0 && srpt_close_ch(ch))
|
|
ret = 0;
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* Send DREQ and wait for DREP. */
|
|
static void srpt_disconnect_ch_sync(struct srpt_rdma_ch *ch)
|
|
{
|
|
DECLARE_COMPLETION_ONSTACK(closed);
|
|
struct srpt_port *sport = ch->sport;
|
|
|
|
pr_debug("ch %s-%d state %d\n", ch->sess_name, ch->qp->qp_num,
|
|
ch->state);
|
|
|
|
ch->closed = &closed;
|
|
|
|
mutex_lock(&sport->mutex);
|
|
srpt_disconnect_ch(ch);
|
|
mutex_unlock(&sport->mutex);
|
|
|
|
while (wait_for_completion_timeout(&closed, 5 * HZ) == 0)
|
|
pr_info("%s(%s-%d state %d): still waiting ...\n", __func__,
|
|
ch->sess_name, ch->qp->qp_num, ch->state);
|
|
|
|
}
|
|
|
|
static void __srpt_close_all_ch(struct srpt_port *sport)
|
|
{
|
|
struct srpt_nexus *nexus;
|
|
struct srpt_rdma_ch *ch;
|
|
|
|
lockdep_assert_held(&sport->mutex);
|
|
|
|
list_for_each_entry(nexus, &sport->nexus_list, entry) {
|
|
list_for_each_entry(ch, &nexus->ch_list, list) {
|
|
if (srpt_disconnect_ch(ch) >= 0)
|
|
pr_info("Closing channel %s-%d because target %s_%d has been disabled\n",
|
|
ch->sess_name, ch->qp->qp_num,
|
|
dev_name(&sport->sdev->device->dev),
|
|
sport->port);
|
|
srpt_close_ch(ch);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Look up (i_port_id, t_port_id) in sport->nexus_list. Create an entry if
|
|
* it does not yet exist.
|
|
*/
|
|
static struct srpt_nexus *srpt_get_nexus(struct srpt_port *sport,
|
|
const u8 i_port_id[16],
|
|
const u8 t_port_id[16])
|
|
{
|
|
struct srpt_nexus *nexus = NULL, *tmp_nexus = NULL, *n;
|
|
|
|
for (;;) {
|
|
mutex_lock(&sport->mutex);
|
|
list_for_each_entry(n, &sport->nexus_list, entry) {
|
|
if (memcmp(n->i_port_id, i_port_id, 16) == 0 &&
|
|
memcmp(n->t_port_id, t_port_id, 16) == 0) {
|
|
nexus = n;
|
|
break;
|
|
}
|
|
}
|
|
if (!nexus && tmp_nexus) {
|
|
list_add_tail_rcu(&tmp_nexus->entry,
|
|
&sport->nexus_list);
|
|
swap(nexus, tmp_nexus);
|
|
}
|
|
mutex_unlock(&sport->mutex);
|
|
|
|
if (nexus)
|
|
break;
|
|
tmp_nexus = kzalloc(sizeof(*nexus), GFP_KERNEL);
|
|
if (!tmp_nexus) {
|
|
nexus = ERR_PTR(-ENOMEM);
|
|
break;
|
|
}
|
|
INIT_LIST_HEAD(&tmp_nexus->ch_list);
|
|
memcpy(tmp_nexus->i_port_id, i_port_id, 16);
|
|
memcpy(tmp_nexus->t_port_id, t_port_id, 16);
|
|
}
|
|
|
|
kfree(tmp_nexus);
|
|
|
|
return nexus;
|
|
}
|
|
|
|
static void srpt_set_enabled(struct srpt_port *sport, bool enabled)
|
|
__must_hold(&sport->mutex)
|
|
{
|
|
lockdep_assert_held(&sport->mutex);
|
|
|
|
if (sport->enabled == enabled)
|
|
return;
|
|
sport->enabled = enabled;
|
|
if (!enabled)
|
|
__srpt_close_all_ch(sport);
|
|
}
|
|
|
|
static void srpt_drop_sport_ref(struct srpt_port *sport)
|
|
{
|
|
if (atomic_dec_return(&sport->refcount) == 0 && sport->freed_channels)
|
|
complete(sport->freed_channels);
|
|
}
|
|
|
|
static void srpt_free_ch(struct kref *kref)
|
|
{
|
|
struct srpt_rdma_ch *ch = container_of(kref, struct srpt_rdma_ch, kref);
|
|
|
|
srpt_drop_sport_ref(ch->sport);
|
|
kfree_rcu(ch, rcu);
|
|
}
|
|
|
|
/*
|
|
* Shut down the SCSI target session, tell the connection manager to
|
|
* disconnect the associated RDMA channel, transition the QP to the error
|
|
* state and remove the channel from the channel list. This function is
|
|
* typically called from inside srpt_zerolength_write_done(). Concurrent
|
|
* srpt_zerolength_write() calls from inside srpt_close_ch() are possible
|
|
* as long as the channel is on sport->nexus_list.
|
|
*/
|
|
static void srpt_release_channel_work(struct work_struct *w)
|
|
{
|
|
struct srpt_rdma_ch *ch;
|
|
struct srpt_device *sdev;
|
|
struct srpt_port *sport;
|
|
struct se_session *se_sess;
|
|
|
|
ch = container_of(w, struct srpt_rdma_ch, release_work);
|
|
pr_debug("%s-%d\n", ch->sess_name, ch->qp->qp_num);
|
|
|
|
sdev = ch->sport->sdev;
|
|
BUG_ON(!sdev);
|
|
|
|
se_sess = ch->sess;
|
|
BUG_ON(!se_sess);
|
|
|
|
target_stop_session(se_sess);
|
|
target_wait_for_sess_cmds(se_sess);
|
|
|
|
target_remove_session(se_sess);
|
|
ch->sess = NULL;
|
|
|
|
if (ch->using_rdma_cm)
|
|
rdma_destroy_id(ch->rdma_cm.cm_id);
|
|
else
|
|
ib_destroy_cm_id(ch->ib_cm.cm_id);
|
|
|
|
sport = ch->sport;
|
|
mutex_lock(&sport->mutex);
|
|
list_del_rcu(&ch->list);
|
|
mutex_unlock(&sport->mutex);
|
|
|
|
if (ch->closed)
|
|
complete(ch->closed);
|
|
|
|
srpt_destroy_ch_ib(ch);
|
|
|
|
srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_ring,
|
|
ch->sport->sdev, ch->rq_size,
|
|
ch->rsp_buf_cache, DMA_TO_DEVICE);
|
|
|
|
kmem_cache_destroy(ch->rsp_buf_cache);
|
|
|
|
srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_recv_ring,
|
|
sdev, ch->rq_size,
|
|
ch->req_buf_cache, DMA_FROM_DEVICE);
|
|
|
|
kmem_cache_destroy(ch->req_buf_cache);
|
|
|
|
kref_put(&ch->kref, srpt_free_ch);
|
|
}
|
|
|
|
/**
|
|
* srpt_cm_req_recv - process the event IB_CM_REQ_RECEIVED
|
|
* @sdev: HCA through which the login request was received.
|
|
* @ib_cm_id: IB/CM connection identifier in case of IB/CM.
|
|
* @rdma_cm_id: RDMA/CM connection identifier in case of RDMA/CM.
|
|
* @port_num: Port through which the REQ message was received.
|
|
* @pkey: P_Key of the incoming connection.
|
|
* @req: SRP login request.
|
|
* @src_addr: GID (IB/CM) or IP address (RDMA/CM) of the port that submitted
|
|
* the login request.
|
|
*
|
|
* Ownership of the cm_id is transferred to the target session if this
|
|
* function returns zero. Otherwise the caller remains the owner of cm_id.
|
|
*/
|
|
static int srpt_cm_req_recv(struct srpt_device *const sdev,
|
|
struct ib_cm_id *ib_cm_id,
|
|
struct rdma_cm_id *rdma_cm_id,
|
|
u8 port_num, __be16 pkey,
|
|
const struct srp_login_req *req,
|
|
const char *src_addr)
|
|
{
|
|
struct srpt_port *sport = &sdev->port[port_num - 1];
|
|
struct srpt_nexus *nexus;
|
|
struct srp_login_rsp *rsp = NULL;
|
|
struct srp_login_rej *rej = NULL;
|
|
union {
|
|
struct rdma_conn_param rdma_cm;
|
|
struct ib_cm_rep_param ib_cm;
|
|
} *rep_param = NULL;
|
|
struct srpt_rdma_ch *ch = NULL;
|
|
char i_port_id[36];
|
|
u32 it_iu_len;
|
|
int i, tag_num, tag_size, ret;
|
|
struct srpt_tpg *stpg;
|
|
|
|
WARN_ON_ONCE(irqs_disabled());
|
|
|
|
it_iu_len = be32_to_cpu(req->req_it_iu_len);
|
|
|
|
pr_info("Received SRP_LOGIN_REQ with i_port_id %pI6, t_port_id %pI6 and it_iu_len %d on port %d (guid=%pI6); pkey %#04x\n",
|
|
req->initiator_port_id, req->target_port_id, it_iu_len,
|
|
port_num, &sport->gid, be16_to_cpu(pkey));
|
|
|
|
nexus = srpt_get_nexus(sport, req->initiator_port_id,
|
|
req->target_port_id);
|
|
if (IS_ERR(nexus)) {
|
|
ret = PTR_ERR(nexus);
|
|
goto out;
|
|
}
|
|
|
|
ret = -ENOMEM;
|
|
rsp = kzalloc(sizeof(*rsp), GFP_KERNEL);
|
|
rej = kzalloc(sizeof(*rej), GFP_KERNEL);
|
|
rep_param = kzalloc(sizeof(*rep_param), GFP_KERNEL);
|
|
if (!rsp || !rej || !rep_param)
|
|
goto out;
|
|
|
|
ret = -EINVAL;
|
|
if (it_iu_len > srp_max_req_size || it_iu_len < 64) {
|
|
rej->reason = cpu_to_be32(
|
|
SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE);
|
|
pr_err("rejected SRP_LOGIN_REQ because its length (%d bytes) is out of range (%d .. %d)\n",
|
|
it_iu_len, 64, srp_max_req_size);
|
|
goto reject;
|
|
}
|
|
|
|
if (!sport->enabled) {
|
|
rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
|
|
pr_info("rejected SRP_LOGIN_REQ because target port %s_%d has not yet been enabled\n",
|
|
dev_name(&sport->sdev->device->dev), port_num);
|
|
goto reject;
|
|
}
|
|
|
|
if (*(__be64 *)req->target_port_id != cpu_to_be64(srpt_service_guid)
|
|
|| *(__be64 *)(req->target_port_id + 8) !=
|
|
cpu_to_be64(srpt_service_guid)) {
|
|
rej->reason = cpu_to_be32(
|
|
SRP_LOGIN_REJ_UNABLE_ASSOCIATE_CHANNEL);
|
|
pr_err("rejected SRP_LOGIN_REQ because it has an invalid target port identifier.\n");
|
|
goto reject;
|
|
}
|
|
|
|
ret = -ENOMEM;
|
|
ch = kzalloc(sizeof(*ch), GFP_KERNEL);
|
|
if (!ch) {
|
|
rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
|
|
pr_err("rejected SRP_LOGIN_REQ because out of memory.\n");
|
|
goto reject;
|
|
}
|
|
|
|
kref_init(&ch->kref);
|
|
ch->pkey = be16_to_cpu(pkey);
|
|
ch->nexus = nexus;
|
|
ch->zw_cqe.done = srpt_zerolength_write_done;
|
|
INIT_WORK(&ch->release_work, srpt_release_channel_work);
|
|
ch->sport = sport;
|
|
if (rdma_cm_id) {
|
|
ch->using_rdma_cm = true;
|
|
ch->rdma_cm.cm_id = rdma_cm_id;
|
|
rdma_cm_id->context = ch;
|
|
} else {
|
|
ch->ib_cm.cm_id = ib_cm_id;
|
|
ib_cm_id->context = ch;
|
|
}
|
|
/*
|
|
* ch->rq_size should be at least as large as the initiator queue
|
|
* depth to avoid that the initiator driver has to report QUEUE_FULL
|
|
* to the SCSI mid-layer.
|
|
*/
|
|
ch->rq_size = min(MAX_SRPT_RQ_SIZE, sdev->device->attrs.max_qp_wr);
|
|
spin_lock_init(&ch->spinlock);
|
|
ch->state = CH_CONNECTING;
|
|
INIT_LIST_HEAD(&ch->cmd_wait_list);
|
|
ch->max_rsp_size = ch->sport->port_attrib.srp_max_rsp_size;
|
|
|
|
ch->rsp_buf_cache = kmem_cache_create("srpt-rsp-buf", ch->max_rsp_size,
|
|
512, 0, NULL);
|
|
if (!ch->rsp_buf_cache)
|
|
goto free_ch;
|
|
|
|
ch->ioctx_ring = (struct srpt_send_ioctx **)
|
|
srpt_alloc_ioctx_ring(ch->sport->sdev, ch->rq_size,
|
|
sizeof(*ch->ioctx_ring[0]),
|
|
ch->rsp_buf_cache, 0, DMA_TO_DEVICE);
|
|
if (!ch->ioctx_ring) {
|
|
pr_err("rejected SRP_LOGIN_REQ because creating a new QP SQ ring failed.\n");
|
|
rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
|
|
goto free_rsp_cache;
|
|
}
|
|
|
|
for (i = 0; i < ch->rq_size; i++)
|
|
ch->ioctx_ring[i]->ch = ch;
|
|
if (!sdev->use_srq) {
|
|
u16 imm_data_offset = req->req_flags & SRP_IMMED_REQUESTED ?
|
|
be16_to_cpu(req->imm_data_offset) : 0;
|
|
u16 alignment_offset;
|
|
u32 req_sz;
|
|
|
|
if (req->req_flags & SRP_IMMED_REQUESTED)
|
|
pr_debug("imm_data_offset = %d\n",
|
|
be16_to_cpu(req->imm_data_offset));
|
|
if (imm_data_offset >= sizeof(struct srp_cmd)) {
|
|
ch->imm_data_offset = imm_data_offset;
|
|
rsp->rsp_flags |= SRP_LOGIN_RSP_IMMED_SUPP;
|
|
} else {
|
|
ch->imm_data_offset = 0;
|
|
}
|
|
alignment_offset = round_up(imm_data_offset, 512) -
|
|
imm_data_offset;
|
|
req_sz = alignment_offset + imm_data_offset + srp_max_req_size;
|
|
ch->req_buf_cache = kmem_cache_create("srpt-req-buf", req_sz,
|
|
512, 0, NULL);
|
|
if (!ch->req_buf_cache)
|
|
goto free_rsp_ring;
|
|
|
|
ch->ioctx_recv_ring = (struct srpt_recv_ioctx **)
|
|
srpt_alloc_ioctx_ring(ch->sport->sdev, ch->rq_size,
|
|
sizeof(*ch->ioctx_recv_ring[0]),
|
|
ch->req_buf_cache,
|
|
alignment_offset,
|
|
DMA_FROM_DEVICE);
|
|
if (!ch->ioctx_recv_ring) {
|
|
pr_err("rejected SRP_LOGIN_REQ because creating a new QP RQ ring failed.\n");
|
|
rej->reason =
|
|
cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
|
|
goto free_recv_cache;
|
|
}
|
|
for (i = 0; i < ch->rq_size; i++)
|
|
INIT_LIST_HEAD(&ch->ioctx_recv_ring[i]->wait_list);
|
|
}
|
|
|
|
ret = srpt_create_ch_ib(ch);
|
|
if (ret) {
|
|
rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
|
|
pr_err("rejected SRP_LOGIN_REQ because creating a new RDMA channel failed.\n");
|
|
goto free_recv_ring;
|
|
}
|
|
|
|
strscpy(ch->sess_name, src_addr, sizeof(ch->sess_name));
|
|
snprintf(i_port_id, sizeof(i_port_id), "0x%016llx%016llx",
|
|
be64_to_cpu(*(__be64 *)nexus->i_port_id),
|
|
be64_to_cpu(*(__be64 *)(nexus->i_port_id + 8)));
|
|
|
|
pr_debug("registering src addr %s or i_port_id %s\n", ch->sess_name,
|
|
i_port_id);
|
|
|
|
tag_num = ch->rq_size;
|
|
tag_size = 1; /* ib_srpt does not use se_sess->sess_cmd_map */
|
|
|
|
if (sport->guid_id) {
|
|
mutex_lock(&sport->guid_id->mutex);
|
|
list_for_each_entry(stpg, &sport->guid_id->tpg_list, entry) {
|
|
if (!IS_ERR_OR_NULL(ch->sess))
|
|
break;
|
|
ch->sess = target_setup_session(&stpg->tpg, tag_num,
|
|
tag_size, TARGET_PROT_NORMAL,
|
|
ch->sess_name, ch, NULL);
|
|
}
|
|
mutex_unlock(&sport->guid_id->mutex);
|
|
}
|
|
|
|
if (sport->gid_id) {
|
|
mutex_lock(&sport->gid_id->mutex);
|
|
list_for_each_entry(stpg, &sport->gid_id->tpg_list, entry) {
|
|
if (!IS_ERR_OR_NULL(ch->sess))
|
|
break;
|
|
ch->sess = target_setup_session(&stpg->tpg, tag_num,
|
|
tag_size, TARGET_PROT_NORMAL, i_port_id,
|
|
ch, NULL);
|
|
if (!IS_ERR_OR_NULL(ch->sess))
|
|
break;
|
|
/* Retry without leading "0x" */
|
|
ch->sess = target_setup_session(&stpg->tpg, tag_num,
|
|
tag_size, TARGET_PROT_NORMAL,
|
|
i_port_id + 2, ch, NULL);
|
|
}
|
|
mutex_unlock(&sport->gid_id->mutex);
|
|
}
|
|
|
|
if (IS_ERR_OR_NULL(ch->sess)) {
|
|
WARN_ON_ONCE(ch->sess == NULL);
|
|
ret = PTR_ERR(ch->sess);
|
|
ch->sess = NULL;
|
|
pr_info("Rejected login for initiator %s: ret = %d.\n",
|
|
ch->sess_name, ret);
|
|
rej->reason = cpu_to_be32(ret == -ENOMEM ?
|
|
SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES :
|
|
SRP_LOGIN_REJ_CHANNEL_LIMIT_REACHED);
|
|
goto destroy_ib;
|
|
}
|
|
|
|
/*
|
|
* Once a session has been created destruction of srpt_rdma_ch objects
|
|
* will decrement sport->refcount. Hence increment sport->refcount now.
|
|
*/
|
|
atomic_inc(&sport->refcount);
|
|
|
|
mutex_lock(&sport->mutex);
|
|
|
|
if ((req->req_flags & SRP_MTCH_ACTION) == SRP_MULTICHAN_SINGLE) {
|
|
struct srpt_rdma_ch *ch2;
|
|
|
|
list_for_each_entry(ch2, &nexus->ch_list, list) {
|
|
if (srpt_disconnect_ch(ch2) < 0)
|
|
continue;
|
|
pr_info("Relogin - closed existing channel %s\n",
|
|
ch2->sess_name);
|
|
rsp->rsp_flags |= SRP_LOGIN_RSP_MULTICHAN_TERMINATED;
|
|
}
|
|
} else {
|
|
rsp->rsp_flags |= SRP_LOGIN_RSP_MULTICHAN_MAINTAINED;
|
|
}
|
|
|
|
list_add_tail_rcu(&ch->list, &nexus->ch_list);
|
|
|
|
if (!sport->enabled) {
|
|
rej->reason = cpu_to_be32(
|
|
SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
|
|
pr_info("rejected SRP_LOGIN_REQ because target %s_%d is not enabled\n",
|
|
dev_name(&sdev->device->dev), port_num);
|
|
mutex_unlock(&sport->mutex);
|
|
ret = -EINVAL;
|
|
goto reject;
|
|
}
|
|
|
|
mutex_unlock(&sport->mutex);
|
|
|
|
ret = ch->using_rdma_cm ? 0 : srpt_ch_qp_rtr(ch, ch->qp);
|
|
if (ret) {
|
|
rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
|
|
pr_err("rejected SRP_LOGIN_REQ because enabling RTR failed (error code = %d)\n",
|
|
ret);
|
|
goto reject;
|
|
}
|
|
|
|
pr_debug("Establish connection sess=%p name=%s ch=%p\n", ch->sess,
|
|
ch->sess_name, ch);
|
|
|
|
/* create srp_login_response */
|
|
rsp->opcode = SRP_LOGIN_RSP;
|
|
rsp->tag = req->tag;
|
|
rsp->max_it_iu_len = cpu_to_be32(srp_max_req_size);
|
|
rsp->max_ti_iu_len = req->req_it_iu_len;
|
|
ch->max_ti_iu_len = it_iu_len;
|
|
rsp->buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
|
|
SRP_BUF_FORMAT_INDIRECT);
|
|
rsp->req_lim_delta = cpu_to_be32(ch->rq_size);
|
|
atomic_set(&ch->req_lim, ch->rq_size);
|
|
atomic_set(&ch->req_lim_delta, 0);
|
|
|
|
/* create cm reply */
|
|
if (ch->using_rdma_cm) {
|
|
rep_param->rdma_cm.private_data = (void *)rsp;
|
|
rep_param->rdma_cm.private_data_len = sizeof(*rsp);
|
|
rep_param->rdma_cm.rnr_retry_count = 7;
|
|
rep_param->rdma_cm.flow_control = 1;
|
|
rep_param->rdma_cm.responder_resources = 4;
|
|
rep_param->rdma_cm.initiator_depth = 4;
|
|
} else {
|
|
rep_param->ib_cm.qp_num = ch->qp->qp_num;
|
|
rep_param->ib_cm.private_data = (void *)rsp;
|
|
rep_param->ib_cm.private_data_len = sizeof(*rsp);
|
|
rep_param->ib_cm.rnr_retry_count = 7;
|
|
rep_param->ib_cm.flow_control = 1;
|
|
rep_param->ib_cm.failover_accepted = 0;
|
|
rep_param->ib_cm.srq = 1;
|
|
rep_param->ib_cm.responder_resources = 4;
|
|
rep_param->ib_cm.initiator_depth = 4;
|
|
}
|
|
|
|
/*
|
|
* Hold the sport mutex while accepting a connection to avoid that
|
|
* srpt_disconnect_ch() is invoked concurrently with this code.
|
|
*/
|
|
mutex_lock(&sport->mutex);
|
|
if (sport->enabled && ch->state == CH_CONNECTING) {
|
|
if (ch->using_rdma_cm)
|
|
ret = rdma_accept(rdma_cm_id, &rep_param->rdma_cm);
|
|
else
|
|
ret = ib_send_cm_rep(ib_cm_id, &rep_param->ib_cm);
|
|
} else {
|
|
ret = -EINVAL;
|
|
}
|
|
mutex_unlock(&sport->mutex);
|
|
|
|
switch (ret) {
|
|
case 0:
|
|
break;
|
|
case -EINVAL:
|
|
goto reject;
|
|
default:
|
|
rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
|
|
pr_err("sending SRP_LOGIN_REQ response failed (error code = %d)\n",
|
|
ret);
|
|
goto reject;
|
|
}
|
|
|
|
goto out;
|
|
|
|
destroy_ib:
|
|
srpt_destroy_ch_ib(ch);
|
|
|
|
free_recv_ring:
|
|
srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_recv_ring,
|
|
ch->sport->sdev, ch->rq_size,
|
|
ch->req_buf_cache, DMA_FROM_DEVICE);
|
|
|
|
free_recv_cache:
|
|
kmem_cache_destroy(ch->req_buf_cache);
|
|
|
|
free_rsp_ring:
|
|
srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_ring,
|
|
ch->sport->sdev, ch->rq_size,
|
|
ch->rsp_buf_cache, DMA_TO_DEVICE);
|
|
|
|
free_rsp_cache:
|
|
kmem_cache_destroy(ch->rsp_buf_cache);
|
|
|
|
free_ch:
|
|
if (rdma_cm_id)
|
|
rdma_cm_id->context = NULL;
|
|
else
|
|
ib_cm_id->context = NULL;
|
|
kfree(ch);
|
|
ch = NULL;
|
|
|
|
WARN_ON_ONCE(ret == 0);
|
|
|
|
reject:
|
|
pr_info("Rejecting login with reason %#x\n", be32_to_cpu(rej->reason));
|
|
rej->opcode = SRP_LOGIN_REJ;
|
|
rej->tag = req->tag;
|
|
rej->buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
|
|
SRP_BUF_FORMAT_INDIRECT);
|
|
|
|
if (rdma_cm_id)
|
|
rdma_reject(rdma_cm_id, rej, sizeof(*rej),
|
|
IB_CM_REJ_CONSUMER_DEFINED);
|
|
else
|
|
ib_send_cm_rej(ib_cm_id, IB_CM_REJ_CONSUMER_DEFINED, NULL, 0,
|
|
rej, sizeof(*rej));
|
|
|
|
if (ch && ch->sess) {
|
|
srpt_close_ch(ch);
|
|
/*
|
|
* Tell the caller not to free cm_id since
|
|
* srpt_release_channel_work() will do that.
|
|
*/
|
|
ret = 0;
|
|
}
|
|
|
|
out:
|
|
kfree(rep_param);
|
|
kfree(rsp);
|
|
kfree(rej);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int srpt_ib_cm_req_recv(struct ib_cm_id *cm_id,
|
|
const struct ib_cm_req_event_param *param,
|
|
void *private_data)
|
|
{
|
|
char sguid[40];
|
|
|
|
srpt_format_guid(sguid, sizeof(sguid),
|
|
¶m->primary_path->dgid.global.interface_id);
|
|
|
|
return srpt_cm_req_recv(cm_id->context, cm_id, NULL, param->port,
|
|
param->primary_path->pkey,
|
|
private_data, sguid);
|
|
}
|
|
|
|
static int srpt_rdma_cm_req_recv(struct rdma_cm_id *cm_id,
|
|
struct rdma_cm_event *event)
|
|
{
|
|
struct srpt_device *sdev;
|
|
struct srp_login_req req;
|
|
const struct srp_login_req_rdma *req_rdma;
|
|
struct sa_path_rec *path_rec = cm_id->route.path_rec;
|
|
char src_addr[40];
|
|
|
|
sdev = ib_get_client_data(cm_id->device, &srpt_client);
|
|
if (!sdev)
|
|
return -ECONNREFUSED;
|
|
|
|
if (event->param.conn.private_data_len < sizeof(*req_rdma))
|
|
return -EINVAL;
|
|
|
|
/* Transform srp_login_req_rdma into srp_login_req. */
|
|
req_rdma = event->param.conn.private_data;
|
|
memset(&req, 0, sizeof(req));
|
|
req.opcode = req_rdma->opcode;
|
|
req.tag = req_rdma->tag;
|
|
req.req_it_iu_len = req_rdma->req_it_iu_len;
|
|
req.req_buf_fmt = req_rdma->req_buf_fmt;
|
|
req.req_flags = req_rdma->req_flags;
|
|
memcpy(req.initiator_port_id, req_rdma->initiator_port_id, 16);
|
|
memcpy(req.target_port_id, req_rdma->target_port_id, 16);
|
|
req.imm_data_offset = req_rdma->imm_data_offset;
|
|
|
|
snprintf(src_addr, sizeof(src_addr), "%pIS",
|
|
&cm_id->route.addr.src_addr);
|
|
|
|
return srpt_cm_req_recv(sdev, NULL, cm_id, cm_id->port_num,
|
|
path_rec ? path_rec->pkey : 0, &req, src_addr);
|
|
}
|
|
|
|
static void srpt_cm_rej_recv(struct srpt_rdma_ch *ch,
|
|
enum ib_cm_rej_reason reason,
|
|
const u8 *private_data,
|
|
u8 private_data_len)
|
|
{
|
|
char *priv = NULL;
|
|
int i;
|
|
|
|
if (private_data_len && (priv = kmalloc(private_data_len * 3 + 1,
|
|
GFP_KERNEL))) {
|
|
for (i = 0; i < private_data_len; i++)
|
|
sprintf(priv + 3 * i, " %02x", private_data[i]);
|
|
}
|
|
pr_info("Received CM REJ for ch %s-%d; reason %d%s%s.\n",
|
|
ch->sess_name, ch->qp->qp_num, reason, private_data_len ?
|
|
"; private data" : "", priv ? priv : " (?)");
|
|
kfree(priv);
|
|
}
|
|
|
|
/**
|
|
* srpt_cm_rtu_recv - process an IB_CM_RTU_RECEIVED or USER_ESTABLISHED event
|
|
* @ch: SRPT RDMA channel.
|
|
*
|
|
* An RTU (ready to use) message indicates that the connection has been
|
|
* established and that the recipient may begin transmitting.
|
|
*/
|
|
static void srpt_cm_rtu_recv(struct srpt_rdma_ch *ch)
|
|
{
|
|
int ret;
|
|
|
|
ret = ch->using_rdma_cm ? 0 : srpt_ch_qp_rts(ch, ch->qp);
|
|
if (ret < 0) {
|
|
pr_err("%s-%d: QP transition to RTS failed\n", ch->sess_name,
|
|
ch->qp->qp_num);
|
|
srpt_close_ch(ch);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Note: calling srpt_close_ch() if the transition to the LIVE state
|
|
* fails is not necessary since that means that that function has
|
|
* already been invoked from another thread.
|
|
*/
|
|
if (!srpt_set_ch_state(ch, CH_LIVE)) {
|
|
pr_err("%s-%d: channel transition to LIVE state failed\n",
|
|
ch->sess_name, ch->qp->qp_num);
|
|
return;
|
|
}
|
|
|
|
/* Trigger wait list processing. */
|
|
ret = srpt_zerolength_write(ch);
|
|
WARN_ONCE(ret < 0, "%d\n", ret);
|
|
}
|
|
|
|
/**
|
|
* srpt_cm_handler - IB connection manager callback function
|
|
* @cm_id: IB/CM connection identifier.
|
|
* @event: IB/CM event.
|
|
*
|
|
* A non-zero return value will cause the caller destroy the CM ID.
|
|
*
|
|
* Note: srpt_cm_handler() must only return a non-zero value when transferring
|
|
* ownership of the cm_id to a channel by srpt_cm_req_recv() failed. Returning
|
|
* a non-zero value in any other case will trigger a race with the
|
|
* ib_destroy_cm_id() call in srpt_release_channel().
|
|
*/
|
|
static int srpt_cm_handler(struct ib_cm_id *cm_id,
|
|
const struct ib_cm_event *event)
|
|
{
|
|
struct srpt_rdma_ch *ch = cm_id->context;
|
|
int ret;
|
|
|
|
ret = 0;
|
|
switch (event->event) {
|
|
case IB_CM_REQ_RECEIVED:
|
|
ret = srpt_ib_cm_req_recv(cm_id, &event->param.req_rcvd,
|
|
event->private_data);
|
|
break;
|
|
case IB_CM_REJ_RECEIVED:
|
|
srpt_cm_rej_recv(ch, event->param.rej_rcvd.reason,
|
|
event->private_data,
|
|
IB_CM_REJ_PRIVATE_DATA_SIZE);
|
|
break;
|
|
case IB_CM_RTU_RECEIVED:
|
|
case IB_CM_USER_ESTABLISHED:
|
|
srpt_cm_rtu_recv(ch);
|
|
break;
|
|
case IB_CM_DREQ_RECEIVED:
|
|
srpt_disconnect_ch(ch);
|
|
break;
|
|
case IB_CM_DREP_RECEIVED:
|
|
pr_info("Received CM DREP message for ch %s-%d.\n",
|
|
ch->sess_name, ch->qp->qp_num);
|
|
srpt_close_ch(ch);
|
|
break;
|
|
case IB_CM_TIMEWAIT_EXIT:
|
|
pr_info("Received CM TimeWait exit for ch %s-%d.\n",
|
|
ch->sess_name, ch->qp->qp_num);
|
|
srpt_close_ch(ch);
|
|
break;
|
|
case IB_CM_REP_ERROR:
|
|
pr_info("Received CM REP error for ch %s-%d.\n", ch->sess_name,
|
|
ch->qp->qp_num);
|
|
break;
|
|
case IB_CM_DREQ_ERROR:
|
|
pr_info("Received CM DREQ ERROR event.\n");
|
|
break;
|
|
case IB_CM_MRA_RECEIVED:
|
|
pr_info("Received CM MRA event\n");
|
|
break;
|
|
default:
|
|
pr_err("received unrecognized CM event %d\n", event->event);
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int srpt_rdma_cm_handler(struct rdma_cm_id *cm_id,
|
|
struct rdma_cm_event *event)
|
|
{
|
|
struct srpt_rdma_ch *ch = cm_id->context;
|
|
int ret = 0;
|
|
|
|
switch (event->event) {
|
|
case RDMA_CM_EVENT_CONNECT_REQUEST:
|
|
ret = srpt_rdma_cm_req_recv(cm_id, event);
|
|
break;
|
|
case RDMA_CM_EVENT_REJECTED:
|
|
srpt_cm_rej_recv(ch, event->status,
|
|
event->param.conn.private_data,
|
|
event->param.conn.private_data_len);
|
|
break;
|
|
case RDMA_CM_EVENT_ESTABLISHED:
|
|
srpt_cm_rtu_recv(ch);
|
|
break;
|
|
case RDMA_CM_EVENT_DISCONNECTED:
|
|
if (ch->state < CH_DISCONNECTING)
|
|
srpt_disconnect_ch(ch);
|
|
else
|
|
srpt_close_ch(ch);
|
|
break;
|
|
case RDMA_CM_EVENT_TIMEWAIT_EXIT:
|
|
srpt_close_ch(ch);
|
|
break;
|
|
case RDMA_CM_EVENT_UNREACHABLE:
|
|
pr_info("Received CM REP error for ch %s-%d.\n", ch->sess_name,
|
|
ch->qp->qp_num);
|
|
break;
|
|
case RDMA_CM_EVENT_DEVICE_REMOVAL:
|
|
case RDMA_CM_EVENT_ADDR_CHANGE:
|
|
break;
|
|
default:
|
|
pr_err("received unrecognized RDMA CM event %d\n",
|
|
event->event);
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* srpt_write_pending - Start data transfer from initiator to target (write).
|
|
*/
|
|
static int srpt_write_pending(struct se_cmd *se_cmd)
|
|
{
|
|
struct srpt_send_ioctx *ioctx =
|
|
container_of(se_cmd, struct srpt_send_ioctx, cmd);
|
|
struct srpt_rdma_ch *ch = ioctx->ch;
|
|
struct ib_send_wr *first_wr = NULL;
|
|
struct ib_cqe *cqe = &ioctx->rdma_cqe;
|
|
enum srpt_command_state new_state;
|
|
int ret, i;
|
|
|
|
if (ioctx->recv_ioctx) {
|
|
srpt_set_cmd_state(ioctx, SRPT_STATE_DATA_IN);
|
|
target_execute_cmd(&ioctx->cmd);
|
|
return 0;
|
|
}
|
|
|
|
new_state = srpt_set_cmd_state(ioctx, SRPT_STATE_NEED_DATA);
|
|
WARN_ON(new_state == SRPT_STATE_DONE);
|
|
|
|
if (atomic_sub_return(ioctx->n_rdma, &ch->sq_wr_avail) < 0) {
|
|
pr_warn("%s: IB send queue full (needed %d)\n",
|
|
__func__, ioctx->n_rdma);
|
|
ret = -ENOMEM;
|
|
goto out_undo;
|
|
}
|
|
|
|
cqe->done = srpt_rdma_read_done;
|
|
for (i = ioctx->n_rw_ctx - 1; i >= 0; i--) {
|
|
struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i];
|
|
|
|
first_wr = rdma_rw_ctx_wrs(&ctx->rw, ch->qp, ch->sport->port,
|
|
cqe, first_wr);
|
|
cqe = NULL;
|
|
}
|
|
|
|
ret = ib_post_send(ch->qp, first_wr, NULL);
|
|
if (ret) {
|
|
pr_err("%s: ib_post_send() returned %d for %d (avail: %d)\n",
|
|
__func__, ret, ioctx->n_rdma,
|
|
atomic_read(&ch->sq_wr_avail));
|
|
goto out_undo;
|
|
}
|
|
|
|
return 0;
|
|
out_undo:
|
|
atomic_add(ioctx->n_rdma, &ch->sq_wr_avail);
|
|
return ret;
|
|
}
|
|
|
|
static u8 tcm_to_srp_tsk_mgmt_status(const int tcm_mgmt_status)
|
|
{
|
|
switch (tcm_mgmt_status) {
|
|
case TMR_FUNCTION_COMPLETE:
|
|
return SRP_TSK_MGMT_SUCCESS;
|
|
case TMR_FUNCTION_REJECTED:
|
|
return SRP_TSK_MGMT_FUNC_NOT_SUPP;
|
|
}
|
|
return SRP_TSK_MGMT_FAILED;
|
|
}
|
|
|
|
/**
|
|
* srpt_queue_response - transmit the response to a SCSI command
|
|
* @cmd: SCSI target command.
|
|
*
|
|
* Callback function called by the TCM core. Must not block since it can be
|
|
* invoked on the context of the IB completion handler.
|
|
*/
|
|
static void srpt_queue_response(struct se_cmd *cmd)
|
|
{
|
|
struct srpt_send_ioctx *ioctx =
|
|
container_of(cmd, struct srpt_send_ioctx, cmd);
|
|
struct srpt_rdma_ch *ch = ioctx->ch;
|
|
struct srpt_device *sdev = ch->sport->sdev;
|
|
struct ib_send_wr send_wr, *first_wr = &send_wr;
|
|
struct ib_sge sge;
|
|
enum srpt_command_state state;
|
|
int resp_len, ret, i;
|
|
u8 srp_tm_status;
|
|
|
|
state = ioctx->state;
|
|
switch (state) {
|
|
case SRPT_STATE_NEW:
|
|
case SRPT_STATE_DATA_IN:
|
|
ioctx->state = SRPT_STATE_CMD_RSP_SENT;
|
|
break;
|
|
case SRPT_STATE_MGMT:
|
|
ioctx->state = SRPT_STATE_MGMT_RSP_SENT;
|
|
break;
|
|
default:
|
|
WARN(true, "ch %p; cmd %d: unexpected command state %d\n",
|
|
ch, ioctx->ioctx.index, ioctx->state);
|
|
break;
|
|
}
|
|
|
|
if (WARN_ON_ONCE(state == SRPT_STATE_CMD_RSP_SENT))
|
|
return;
|
|
|
|
/* For read commands, transfer the data to the initiator. */
|
|
if (ioctx->cmd.data_direction == DMA_FROM_DEVICE &&
|
|
ioctx->cmd.data_length &&
|
|
!ioctx->queue_status_only) {
|
|
for (i = ioctx->n_rw_ctx - 1; i >= 0; i--) {
|
|
struct srpt_rw_ctx *ctx = &ioctx->rw_ctxs[i];
|
|
|
|
first_wr = rdma_rw_ctx_wrs(&ctx->rw, ch->qp,
|
|
ch->sport->port, NULL, first_wr);
|
|
}
|
|
}
|
|
|
|
if (state != SRPT_STATE_MGMT)
|
|
resp_len = srpt_build_cmd_rsp(ch, ioctx, ioctx->cmd.tag,
|
|
cmd->scsi_status);
|
|
else {
|
|
srp_tm_status
|
|
= tcm_to_srp_tsk_mgmt_status(cmd->se_tmr_req->response);
|
|
resp_len = srpt_build_tskmgmt_rsp(ch, ioctx, srp_tm_status,
|
|
ioctx->cmd.tag);
|
|
}
|
|
|
|
atomic_inc(&ch->req_lim);
|
|
|
|
if (unlikely(atomic_sub_return(1 + ioctx->n_rdma,
|
|
&ch->sq_wr_avail) < 0)) {
|
|
pr_warn("%s: IB send queue full (needed %d)\n",
|
|
__func__, ioctx->n_rdma);
|
|
goto out;
|
|
}
|
|
|
|
ib_dma_sync_single_for_device(sdev->device, ioctx->ioctx.dma, resp_len,
|
|
DMA_TO_DEVICE);
|
|
|
|
sge.addr = ioctx->ioctx.dma;
|
|
sge.length = resp_len;
|
|
sge.lkey = sdev->lkey;
|
|
|
|
ioctx->ioctx.cqe.done = srpt_send_done;
|
|
send_wr.next = NULL;
|
|
send_wr.wr_cqe = &ioctx->ioctx.cqe;
|
|
send_wr.sg_list = &sge;
|
|
send_wr.num_sge = 1;
|
|
send_wr.opcode = IB_WR_SEND;
|
|
send_wr.send_flags = IB_SEND_SIGNALED;
|
|
|
|
ret = ib_post_send(ch->qp, first_wr, NULL);
|
|
if (ret < 0) {
|
|
pr_err("%s: sending cmd response failed for tag %llu (%d)\n",
|
|
__func__, ioctx->cmd.tag, ret);
|
|
goto out;
|
|
}
|
|
|
|
return;
|
|
|
|
out:
|
|
atomic_add(1 + ioctx->n_rdma, &ch->sq_wr_avail);
|
|
atomic_dec(&ch->req_lim);
|
|
srpt_set_cmd_state(ioctx, SRPT_STATE_DONE);
|
|
target_put_sess_cmd(&ioctx->cmd);
|
|
}
|
|
|
|
static int srpt_queue_data_in(struct se_cmd *cmd)
|
|
{
|
|
srpt_queue_response(cmd);
|
|
return 0;
|
|
}
|
|
|
|
static void srpt_queue_tm_rsp(struct se_cmd *cmd)
|
|
{
|
|
srpt_queue_response(cmd);
|
|
}
|
|
|
|
/*
|
|
* This function is called for aborted commands if no response is sent to the
|
|
* initiator. Make sure that the credits freed by aborting a command are
|
|
* returned to the initiator the next time a response is sent by incrementing
|
|
* ch->req_lim_delta.
|
|
*/
|
|
static void srpt_aborted_task(struct se_cmd *cmd)
|
|
{
|
|
struct srpt_send_ioctx *ioctx = container_of(cmd,
|
|
struct srpt_send_ioctx, cmd);
|
|
struct srpt_rdma_ch *ch = ioctx->ch;
|
|
|
|
atomic_inc(&ch->req_lim_delta);
|
|
}
|
|
|
|
static int srpt_queue_status(struct se_cmd *cmd)
|
|
{
|
|
struct srpt_send_ioctx *ioctx;
|
|
|
|
ioctx = container_of(cmd, struct srpt_send_ioctx, cmd);
|
|
BUG_ON(ioctx->sense_data != cmd->sense_buffer);
|
|
if (cmd->se_cmd_flags &
|
|
(SCF_TRANSPORT_TASK_SENSE | SCF_EMULATED_TASK_SENSE))
|
|
WARN_ON(cmd->scsi_status != SAM_STAT_CHECK_CONDITION);
|
|
ioctx->queue_status_only = true;
|
|
srpt_queue_response(cmd);
|
|
return 0;
|
|
}
|
|
|
|
static void srpt_refresh_port_work(struct work_struct *work)
|
|
{
|
|
struct srpt_port *sport = container_of(work, struct srpt_port, work);
|
|
|
|
srpt_refresh_port(sport);
|
|
}
|
|
|
|
/**
|
|
* srpt_release_sport - disable login and wait for associated channels
|
|
* @sport: SRPT HCA port.
|
|
*/
|
|
static int srpt_release_sport(struct srpt_port *sport)
|
|
{
|
|
DECLARE_COMPLETION_ONSTACK(c);
|
|
struct srpt_nexus *nexus, *next_n;
|
|
struct srpt_rdma_ch *ch;
|
|
|
|
WARN_ON_ONCE(irqs_disabled());
|
|
|
|
sport->freed_channels = &c;
|
|
|
|
mutex_lock(&sport->mutex);
|
|
srpt_set_enabled(sport, false);
|
|
mutex_unlock(&sport->mutex);
|
|
|
|
while (atomic_read(&sport->refcount) > 0 &&
|
|
wait_for_completion_timeout(&c, 5 * HZ) <= 0) {
|
|
pr_info("%s_%d: waiting for unregistration of %d sessions ...\n",
|
|
dev_name(&sport->sdev->device->dev), sport->port,
|
|
atomic_read(&sport->refcount));
|
|
rcu_read_lock();
|
|
list_for_each_entry(nexus, &sport->nexus_list, entry) {
|
|
list_for_each_entry(ch, &nexus->ch_list, list) {
|
|
pr_info("%s-%d: state %s\n",
|
|
ch->sess_name, ch->qp->qp_num,
|
|
get_ch_state_name(ch->state));
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
mutex_lock(&sport->mutex);
|
|
list_for_each_entry_safe(nexus, next_n, &sport->nexus_list, entry) {
|
|
list_del(&nexus->entry);
|
|
kfree_rcu(nexus, rcu);
|
|
}
|
|
mutex_unlock(&sport->mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct port_and_port_id {
|
|
struct srpt_port *sport;
|
|
struct srpt_port_id **port_id;
|
|
};
|
|
|
|
static struct port_and_port_id __srpt_lookup_port(const char *name)
|
|
{
|
|
struct ib_device *dev;
|
|
struct srpt_device *sdev;
|
|
struct srpt_port *sport;
|
|
int i;
|
|
|
|
list_for_each_entry(sdev, &srpt_dev_list, list) {
|
|
dev = sdev->device;
|
|
if (!dev)
|
|
continue;
|
|
|
|
for (i = 0; i < dev->phys_port_cnt; i++) {
|
|
sport = &sdev->port[i];
|
|
|
|
if (strcmp(sport->guid_name, name) == 0) {
|
|
kref_get(&sdev->refcnt);
|
|
return (struct port_and_port_id){
|
|
sport, &sport->guid_id};
|
|
}
|
|
if (strcmp(sport->gid_name, name) == 0) {
|
|
kref_get(&sdev->refcnt);
|
|
return (struct port_and_port_id){
|
|
sport, &sport->gid_id};
|
|
}
|
|
}
|
|
}
|
|
|
|
return (struct port_and_port_id){};
|
|
}
|
|
|
|
/**
|
|
* srpt_lookup_port() - Look up an RDMA port by name
|
|
* @name: ASCII port name
|
|
*
|
|
* Increments the RDMA port reference count if an RDMA port pointer is returned.
|
|
* The caller must drop that reference count by calling srpt_port_put_ref().
|
|
*/
|
|
static struct port_and_port_id srpt_lookup_port(const char *name)
|
|
{
|
|
struct port_and_port_id papi;
|
|
|
|
spin_lock(&srpt_dev_lock);
|
|
papi = __srpt_lookup_port(name);
|
|
spin_unlock(&srpt_dev_lock);
|
|
|
|
return papi;
|
|
}
|
|
|
|
static void srpt_free_srq(struct srpt_device *sdev)
|
|
{
|
|
if (!sdev->srq)
|
|
return;
|
|
|
|
ib_destroy_srq(sdev->srq);
|
|
srpt_free_ioctx_ring((struct srpt_ioctx **)sdev->ioctx_ring, sdev,
|
|
sdev->srq_size, sdev->req_buf_cache,
|
|
DMA_FROM_DEVICE);
|
|
kmem_cache_destroy(sdev->req_buf_cache);
|
|
sdev->srq = NULL;
|
|
}
|
|
|
|
static int srpt_alloc_srq(struct srpt_device *sdev)
|
|
{
|
|
struct ib_srq_init_attr srq_attr = {
|
|
.event_handler = srpt_srq_event,
|
|
.srq_context = (void *)sdev,
|
|
.attr.max_wr = sdev->srq_size,
|
|
.attr.max_sge = 1,
|
|
.srq_type = IB_SRQT_BASIC,
|
|
};
|
|
struct ib_device *device = sdev->device;
|
|
struct ib_srq *srq;
|
|
int i;
|
|
|
|
WARN_ON_ONCE(sdev->srq);
|
|
srq = ib_create_srq(sdev->pd, &srq_attr);
|
|
if (IS_ERR(srq)) {
|
|
pr_debug("ib_create_srq() failed: %ld\n", PTR_ERR(srq));
|
|
return PTR_ERR(srq);
|
|
}
|
|
|
|
pr_debug("create SRQ #wr= %d max_allow=%d dev= %s\n", sdev->srq_size,
|
|
sdev->device->attrs.max_srq_wr, dev_name(&device->dev));
|
|
|
|
sdev->req_buf_cache = kmem_cache_create("srpt-srq-req-buf",
|
|
srp_max_req_size, 0, 0, NULL);
|
|
if (!sdev->req_buf_cache)
|
|
goto free_srq;
|
|
|
|
sdev->ioctx_ring = (struct srpt_recv_ioctx **)
|
|
srpt_alloc_ioctx_ring(sdev, sdev->srq_size,
|
|
sizeof(*sdev->ioctx_ring[0]),
|
|
sdev->req_buf_cache, 0, DMA_FROM_DEVICE);
|
|
if (!sdev->ioctx_ring)
|
|
goto free_cache;
|
|
|
|
sdev->use_srq = true;
|
|
sdev->srq = srq;
|
|
|
|
for (i = 0; i < sdev->srq_size; ++i) {
|
|
INIT_LIST_HEAD(&sdev->ioctx_ring[i]->wait_list);
|
|
srpt_post_recv(sdev, NULL, sdev->ioctx_ring[i]);
|
|
}
|
|
|
|
return 0;
|
|
|
|
free_cache:
|
|
kmem_cache_destroy(sdev->req_buf_cache);
|
|
|
|
free_srq:
|
|
ib_destroy_srq(srq);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static int srpt_use_srq(struct srpt_device *sdev, bool use_srq)
|
|
{
|
|
struct ib_device *device = sdev->device;
|
|
int ret = 0;
|
|
|
|
if (!use_srq) {
|
|
srpt_free_srq(sdev);
|
|
sdev->use_srq = false;
|
|
} else if (use_srq && !sdev->srq) {
|
|
ret = srpt_alloc_srq(sdev);
|
|
}
|
|
pr_debug("%s(%s): use_srq = %d; ret = %d\n", __func__,
|
|
dev_name(&device->dev), sdev->use_srq, ret);
|
|
return ret;
|
|
}
|
|
|
|
static void srpt_free_sdev(struct kref *refcnt)
|
|
{
|
|
struct srpt_device *sdev = container_of(refcnt, typeof(*sdev), refcnt);
|
|
|
|
kfree(sdev);
|
|
}
|
|
|
|
static void srpt_sdev_put(struct srpt_device *sdev)
|
|
{
|
|
kref_put(&sdev->refcnt, srpt_free_sdev);
|
|
}
|
|
|
|
/**
|
|
* srpt_add_one - InfiniBand device addition callback function
|
|
* @device: Describes a HCA.
|
|
*/
|
|
static int srpt_add_one(struct ib_device *device)
|
|
{
|
|
struct srpt_device *sdev;
|
|
struct srpt_port *sport;
|
|
int ret;
|
|
u32 i;
|
|
|
|
pr_debug("device = %p\n", device);
|
|
|
|
sdev = kzalloc(struct_size(sdev, port, device->phys_port_cnt),
|
|
GFP_KERNEL);
|
|
if (!sdev)
|
|
return -ENOMEM;
|
|
|
|
kref_init(&sdev->refcnt);
|
|
sdev->device = device;
|
|
mutex_init(&sdev->sdev_mutex);
|
|
|
|
sdev->pd = ib_alloc_pd(device, 0);
|
|
if (IS_ERR(sdev->pd)) {
|
|
ret = PTR_ERR(sdev->pd);
|
|
goto free_dev;
|
|
}
|
|
|
|
sdev->lkey = sdev->pd->local_dma_lkey;
|
|
|
|
sdev->srq_size = min(srpt_srq_size, sdev->device->attrs.max_srq_wr);
|
|
|
|
srpt_use_srq(sdev, sdev->port[0].port_attrib.use_srq);
|
|
|
|
if (!srpt_service_guid)
|
|
srpt_service_guid = be64_to_cpu(device->node_guid);
|
|
|
|
if (rdma_port_get_link_layer(device, 1) == IB_LINK_LAYER_INFINIBAND)
|
|
sdev->cm_id = ib_create_cm_id(device, srpt_cm_handler, sdev);
|
|
if (IS_ERR(sdev->cm_id)) {
|
|
pr_info("ib_create_cm_id() failed: %ld\n",
|
|
PTR_ERR(sdev->cm_id));
|
|
ret = PTR_ERR(sdev->cm_id);
|
|
sdev->cm_id = NULL;
|
|
if (!rdma_cm_id)
|
|
goto err_ring;
|
|
}
|
|
|
|
/* print out target login information */
|
|
pr_debug("Target login info: id_ext=%016llx,ioc_guid=%016llx,pkey=ffff,service_id=%016llx\n",
|
|
srpt_service_guid, srpt_service_guid, srpt_service_guid);
|
|
|
|
/*
|
|
* We do not have a consistent service_id (ie. also id_ext of target_id)
|
|
* to identify this target. We currently use the guid of the first HCA
|
|
* in the system as service_id; therefore, the target_id will change
|
|
* if this HCA is gone bad and replaced by different HCA
|
|
*/
|
|
ret = sdev->cm_id ?
|
|
ib_cm_listen(sdev->cm_id, cpu_to_be64(srpt_service_guid)) :
|
|
0;
|
|
if (ret < 0) {
|
|
pr_err("ib_cm_listen() failed: %d (cm_id state = %d)\n", ret,
|
|
sdev->cm_id->state);
|
|
goto err_cm;
|
|
}
|
|
|
|
INIT_IB_EVENT_HANDLER(&sdev->event_handler, sdev->device,
|
|
srpt_event_handler);
|
|
ib_register_event_handler(&sdev->event_handler);
|
|
|
|
for (i = 1; i <= sdev->device->phys_port_cnt; i++) {
|
|
sport = &sdev->port[i - 1];
|
|
INIT_LIST_HEAD(&sport->nexus_list);
|
|
mutex_init(&sport->mutex);
|
|
sport->sdev = sdev;
|
|
sport->port = i;
|
|
sport->port_attrib.srp_max_rdma_size = DEFAULT_MAX_RDMA_SIZE;
|
|
sport->port_attrib.srp_max_rsp_size = DEFAULT_MAX_RSP_SIZE;
|
|
sport->port_attrib.srp_sq_size = DEF_SRPT_SQ_SIZE;
|
|
sport->port_attrib.use_srq = false;
|
|
INIT_WORK(&sport->work, srpt_refresh_port_work);
|
|
|
|
ret = srpt_refresh_port(sport);
|
|
if (ret) {
|
|
pr_err("MAD registration failed for %s-%d.\n",
|
|
dev_name(&sdev->device->dev), i);
|
|
i--;
|
|
goto err_port;
|
|
}
|
|
}
|
|
|
|
spin_lock(&srpt_dev_lock);
|
|
list_add_tail(&sdev->list, &srpt_dev_list);
|
|
spin_unlock(&srpt_dev_lock);
|
|
|
|
ib_set_client_data(device, &srpt_client, sdev);
|
|
pr_debug("added %s.\n", dev_name(&device->dev));
|
|
return 0;
|
|
|
|
err_port:
|
|
srpt_unregister_mad_agent(sdev, i);
|
|
ib_unregister_event_handler(&sdev->event_handler);
|
|
err_cm:
|
|
if (sdev->cm_id)
|
|
ib_destroy_cm_id(sdev->cm_id);
|
|
err_ring:
|
|
srpt_free_srq(sdev);
|
|
ib_dealloc_pd(sdev->pd);
|
|
free_dev:
|
|
srpt_sdev_put(sdev);
|
|
pr_info("%s(%s) failed.\n", __func__, dev_name(&device->dev));
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* srpt_remove_one - InfiniBand device removal callback function
|
|
* @device: Describes a HCA.
|
|
* @client_data: The value passed as the third argument to ib_set_client_data().
|
|
*/
|
|
static void srpt_remove_one(struct ib_device *device, void *client_data)
|
|
{
|
|
struct srpt_device *sdev = client_data;
|
|
int i;
|
|
|
|
srpt_unregister_mad_agent(sdev, sdev->device->phys_port_cnt);
|
|
|
|
ib_unregister_event_handler(&sdev->event_handler);
|
|
|
|
/* Cancel any work queued by the just unregistered IB event handler. */
|
|
for (i = 0; i < sdev->device->phys_port_cnt; i++)
|
|
cancel_work_sync(&sdev->port[i].work);
|
|
|
|
if (sdev->cm_id)
|
|
ib_destroy_cm_id(sdev->cm_id);
|
|
|
|
ib_set_client_data(device, &srpt_client, NULL);
|
|
|
|
/*
|
|
* Unregistering a target must happen after destroying sdev->cm_id
|
|
* such that no new SRP_LOGIN_REQ information units can arrive while
|
|
* destroying the target.
|
|
*/
|
|
spin_lock(&srpt_dev_lock);
|
|
list_del(&sdev->list);
|
|
spin_unlock(&srpt_dev_lock);
|
|
|
|
for (i = 0; i < sdev->device->phys_port_cnt; i++)
|
|
srpt_release_sport(&sdev->port[i]);
|
|
|
|
srpt_free_srq(sdev);
|
|
|
|
ib_dealloc_pd(sdev->pd);
|
|
|
|
srpt_sdev_put(sdev);
|
|
}
|
|
|
|
static struct ib_client srpt_client = {
|
|
.name = DRV_NAME,
|
|
.add = srpt_add_one,
|
|
.remove = srpt_remove_one
|
|
};
|
|
|
|
static int srpt_check_true(struct se_portal_group *se_tpg)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static int srpt_check_false(struct se_portal_group *se_tpg)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static struct srpt_port *srpt_tpg_to_sport(struct se_portal_group *tpg)
|
|
{
|
|
return tpg->se_tpg_wwn->priv;
|
|
}
|
|
|
|
static struct srpt_port_id *srpt_wwn_to_sport_id(struct se_wwn *wwn)
|
|
{
|
|
struct srpt_port *sport = wwn->priv;
|
|
|
|
if (sport->guid_id && &sport->guid_id->wwn == wwn)
|
|
return sport->guid_id;
|
|
if (sport->gid_id && &sport->gid_id->wwn == wwn)
|
|
return sport->gid_id;
|
|
WARN_ON_ONCE(true);
|
|
return NULL;
|
|
}
|
|
|
|
static char *srpt_get_fabric_wwn(struct se_portal_group *tpg)
|
|
{
|
|
struct srpt_tpg *stpg = container_of(tpg, typeof(*stpg), tpg);
|
|
|
|
return stpg->sport_id->name;
|
|
}
|
|
|
|
static u16 srpt_get_tag(struct se_portal_group *tpg)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static u32 srpt_tpg_get_inst_index(struct se_portal_group *se_tpg)
|
|
{
|
|
return 1;
|
|
}
|
|
|
|
static void srpt_release_cmd(struct se_cmd *se_cmd)
|
|
{
|
|
struct srpt_send_ioctx *ioctx = container_of(se_cmd,
|
|
struct srpt_send_ioctx, cmd);
|
|
struct srpt_rdma_ch *ch = ioctx->ch;
|
|
struct srpt_recv_ioctx *recv_ioctx = ioctx->recv_ioctx;
|
|
|
|
WARN_ON_ONCE(ioctx->state != SRPT_STATE_DONE &&
|
|
!(ioctx->cmd.transport_state & CMD_T_ABORTED));
|
|
|
|
if (recv_ioctx) {
|
|
WARN_ON_ONCE(!list_empty(&recv_ioctx->wait_list));
|
|
ioctx->recv_ioctx = NULL;
|
|
srpt_post_recv(ch->sport->sdev, ch, recv_ioctx);
|
|
}
|
|
|
|
if (ioctx->n_rw_ctx) {
|
|
srpt_free_rw_ctxs(ch, ioctx);
|
|
ioctx->n_rw_ctx = 0;
|
|
}
|
|
|
|
target_free_tag(se_cmd->se_sess, se_cmd);
|
|
}
|
|
|
|
/**
|
|
* srpt_close_session - forcibly close a session
|
|
* @se_sess: SCSI target session.
|
|
*
|
|
* Callback function invoked by the TCM core to clean up sessions associated
|
|
* with a node ACL when the user invokes
|
|
* rmdir /sys/kernel/config/target/$driver/$port/$tpg/acls/$i_port_id
|
|
*/
|
|
static void srpt_close_session(struct se_session *se_sess)
|
|
{
|
|
struct srpt_rdma_ch *ch = se_sess->fabric_sess_ptr;
|
|
|
|
srpt_disconnect_ch_sync(ch);
|
|
}
|
|
|
|
/**
|
|
* srpt_sess_get_index - return the value of scsiAttIntrPortIndex (SCSI-MIB)
|
|
* @se_sess: SCSI target session.
|
|
*
|
|
* A quote from RFC 4455 (SCSI-MIB) about this MIB object:
|
|
* This object represents an arbitrary integer used to uniquely identify a
|
|
* particular attached remote initiator port to a particular SCSI target port
|
|
* within a particular SCSI target device within a particular SCSI instance.
|
|
*/
|
|
static u32 srpt_sess_get_index(struct se_session *se_sess)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static void srpt_set_default_node_attrs(struct se_node_acl *nacl)
|
|
{
|
|
}
|
|
|
|
/* Note: only used from inside debug printk's by the TCM core. */
|
|
static int srpt_get_tcm_cmd_state(struct se_cmd *se_cmd)
|
|
{
|
|
struct srpt_send_ioctx *ioctx;
|
|
|
|
ioctx = container_of(se_cmd, struct srpt_send_ioctx, cmd);
|
|
return ioctx->state;
|
|
}
|
|
|
|
static int srpt_parse_guid(u64 *guid, const char *name)
|
|
{
|
|
u16 w[4];
|
|
int ret = -EINVAL;
|
|
|
|
if (sscanf(name, "%hx:%hx:%hx:%hx", &w[0], &w[1], &w[2], &w[3]) != 4)
|
|
goto out;
|
|
*guid = get_unaligned_be64(w);
|
|
ret = 0;
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* srpt_parse_i_port_id - parse an initiator port ID
|
|
* @name: ASCII representation of a 128-bit initiator port ID.
|
|
* @i_port_id: Binary 128-bit port ID.
|
|
*/
|
|
static int srpt_parse_i_port_id(u8 i_port_id[16], const char *name)
|
|
{
|
|
const char *p;
|
|
unsigned len, count, leading_zero_bytes;
|
|
int ret;
|
|
|
|
p = name;
|
|
if (strncasecmp(p, "0x", 2) == 0)
|
|
p += 2;
|
|
ret = -EINVAL;
|
|
len = strlen(p);
|
|
if (len % 2)
|
|
goto out;
|
|
count = min(len / 2, 16U);
|
|
leading_zero_bytes = 16 - count;
|
|
memset(i_port_id, 0, leading_zero_bytes);
|
|
ret = hex2bin(i_port_id + leading_zero_bytes, p, count);
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* configfs callback function invoked for mkdir
|
|
* /sys/kernel/config/target/$driver/$port/$tpg/acls/$i_port_id
|
|
*
|
|
* i_port_id must be an initiator port GUID, GID or IP address. See also the
|
|
* target_alloc_session() calls in this driver. Examples of valid initiator
|
|
* port IDs:
|
|
* 0x0000000000000000505400fffe4a0b7b
|
|
* 0000000000000000505400fffe4a0b7b
|
|
* 5054:00ff:fe4a:0b7b
|
|
* 192.168.122.76
|
|
*/
|
|
static int srpt_init_nodeacl(struct se_node_acl *se_nacl, const char *name)
|
|
{
|
|
struct sockaddr_storage sa;
|
|
u64 guid;
|
|
u8 i_port_id[16];
|
|
int ret;
|
|
|
|
ret = srpt_parse_guid(&guid, name);
|
|
if (ret < 0)
|
|
ret = srpt_parse_i_port_id(i_port_id, name);
|
|
if (ret < 0)
|
|
ret = inet_pton_with_scope(&init_net, AF_UNSPEC, name, NULL,
|
|
&sa);
|
|
if (ret < 0)
|
|
pr_err("invalid initiator port ID %s\n", name);
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t srpt_tpg_attrib_srp_max_rdma_size_show(struct config_item *item,
|
|
char *page)
|
|
{
|
|
struct se_portal_group *se_tpg = attrib_to_tpg(item);
|
|
struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);
|
|
|
|
return sysfs_emit(page, "%u\n", sport->port_attrib.srp_max_rdma_size);
|
|
}
|
|
|
|
static ssize_t srpt_tpg_attrib_srp_max_rdma_size_store(struct config_item *item,
|
|
const char *page, size_t count)
|
|
{
|
|
struct se_portal_group *se_tpg = attrib_to_tpg(item);
|
|
struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);
|
|
unsigned long val;
|
|
int ret;
|
|
|
|
ret = kstrtoul(page, 0, &val);
|
|
if (ret < 0) {
|
|
pr_err("kstrtoul() failed with ret: %d\n", ret);
|
|
return -EINVAL;
|
|
}
|
|
if (val > MAX_SRPT_RDMA_SIZE) {
|
|
pr_err("val: %lu exceeds MAX_SRPT_RDMA_SIZE: %d\n", val,
|
|
MAX_SRPT_RDMA_SIZE);
|
|
return -EINVAL;
|
|
}
|
|
if (val < DEFAULT_MAX_RDMA_SIZE) {
|
|
pr_err("val: %lu smaller than DEFAULT_MAX_RDMA_SIZE: %d\n",
|
|
val, DEFAULT_MAX_RDMA_SIZE);
|
|
return -EINVAL;
|
|
}
|
|
sport->port_attrib.srp_max_rdma_size = val;
|
|
|
|
return count;
|
|
}
|
|
|
|
static ssize_t srpt_tpg_attrib_srp_max_rsp_size_show(struct config_item *item,
|
|
char *page)
|
|
{
|
|
struct se_portal_group *se_tpg = attrib_to_tpg(item);
|
|
struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);
|
|
|
|
return sysfs_emit(page, "%u\n", sport->port_attrib.srp_max_rsp_size);
|
|
}
|
|
|
|
static ssize_t srpt_tpg_attrib_srp_max_rsp_size_store(struct config_item *item,
|
|
const char *page, size_t count)
|
|
{
|
|
struct se_portal_group *se_tpg = attrib_to_tpg(item);
|
|
struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);
|
|
unsigned long val;
|
|
int ret;
|
|
|
|
ret = kstrtoul(page, 0, &val);
|
|
if (ret < 0) {
|
|
pr_err("kstrtoul() failed with ret: %d\n", ret);
|
|
return -EINVAL;
|
|
}
|
|
if (val > MAX_SRPT_RSP_SIZE) {
|
|
pr_err("val: %lu exceeds MAX_SRPT_RSP_SIZE: %d\n", val,
|
|
MAX_SRPT_RSP_SIZE);
|
|
return -EINVAL;
|
|
}
|
|
if (val < MIN_MAX_RSP_SIZE) {
|
|
pr_err("val: %lu smaller than MIN_MAX_RSP_SIZE: %d\n", val,
|
|
MIN_MAX_RSP_SIZE);
|
|
return -EINVAL;
|
|
}
|
|
sport->port_attrib.srp_max_rsp_size = val;
|
|
|
|
return count;
|
|
}
|
|
|
|
static ssize_t srpt_tpg_attrib_srp_sq_size_show(struct config_item *item,
|
|
char *page)
|
|
{
|
|
struct se_portal_group *se_tpg = attrib_to_tpg(item);
|
|
struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);
|
|
|
|
return sysfs_emit(page, "%u\n", sport->port_attrib.srp_sq_size);
|
|
}
|
|
|
|
static ssize_t srpt_tpg_attrib_srp_sq_size_store(struct config_item *item,
|
|
const char *page, size_t count)
|
|
{
|
|
struct se_portal_group *se_tpg = attrib_to_tpg(item);
|
|
struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);
|
|
unsigned long val;
|
|
int ret;
|
|
|
|
ret = kstrtoul(page, 0, &val);
|
|
if (ret < 0) {
|
|
pr_err("kstrtoul() failed with ret: %d\n", ret);
|
|
return -EINVAL;
|
|
}
|
|
if (val > MAX_SRPT_SRQ_SIZE) {
|
|
pr_err("val: %lu exceeds MAX_SRPT_SRQ_SIZE: %d\n", val,
|
|
MAX_SRPT_SRQ_SIZE);
|
|
return -EINVAL;
|
|
}
|
|
if (val < MIN_SRPT_SRQ_SIZE) {
|
|
pr_err("val: %lu smaller than MIN_SRPT_SRQ_SIZE: %d\n", val,
|
|
MIN_SRPT_SRQ_SIZE);
|
|
return -EINVAL;
|
|
}
|
|
sport->port_attrib.srp_sq_size = val;
|
|
|
|
return count;
|
|
}
|
|
|
|
static ssize_t srpt_tpg_attrib_use_srq_show(struct config_item *item,
|
|
char *page)
|
|
{
|
|
struct se_portal_group *se_tpg = attrib_to_tpg(item);
|
|
struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);
|
|
|
|
return sysfs_emit(page, "%d\n", sport->port_attrib.use_srq);
|
|
}
|
|
|
|
static ssize_t srpt_tpg_attrib_use_srq_store(struct config_item *item,
|
|
const char *page, size_t count)
|
|
{
|
|
struct se_portal_group *se_tpg = attrib_to_tpg(item);
|
|
struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);
|
|
struct srpt_device *sdev = sport->sdev;
|
|
unsigned long val;
|
|
bool enabled;
|
|
int ret;
|
|
|
|
ret = kstrtoul(page, 0, &val);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (val != !!val)
|
|
return -EINVAL;
|
|
|
|
ret = mutex_lock_interruptible(&sdev->sdev_mutex);
|
|
if (ret < 0)
|
|
return ret;
|
|
ret = mutex_lock_interruptible(&sport->mutex);
|
|
if (ret < 0)
|
|
goto unlock_sdev;
|
|
enabled = sport->enabled;
|
|
/* Log out all initiator systems before changing 'use_srq'. */
|
|
srpt_set_enabled(sport, false);
|
|
sport->port_attrib.use_srq = val;
|
|
srpt_use_srq(sdev, sport->port_attrib.use_srq);
|
|
srpt_set_enabled(sport, enabled);
|
|
ret = count;
|
|
mutex_unlock(&sport->mutex);
|
|
unlock_sdev:
|
|
mutex_unlock(&sdev->sdev_mutex);
|
|
|
|
return ret;
|
|
}
|
|
|
|
CONFIGFS_ATTR(srpt_tpg_attrib_, srp_max_rdma_size);
|
|
CONFIGFS_ATTR(srpt_tpg_attrib_, srp_max_rsp_size);
|
|
CONFIGFS_ATTR(srpt_tpg_attrib_, srp_sq_size);
|
|
CONFIGFS_ATTR(srpt_tpg_attrib_, use_srq);
|
|
|
|
static struct configfs_attribute *srpt_tpg_attrib_attrs[] = {
|
|
&srpt_tpg_attrib_attr_srp_max_rdma_size,
|
|
&srpt_tpg_attrib_attr_srp_max_rsp_size,
|
|
&srpt_tpg_attrib_attr_srp_sq_size,
|
|
&srpt_tpg_attrib_attr_use_srq,
|
|
NULL,
|
|
};
|
|
|
|
static struct rdma_cm_id *srpt_create_rdma_id(struct sockaddr *listen_addr)
|
|
{
|
|
struct rdma_cm_id *rdma_cm_id;
|
|
int ret;
|
|
|
|
rdma_cm_id = rdma_create_id(&init_net, srpt_rdma_cm_handler,
|
|
NULL, RDMA_PS_TCP, IB_QPT_RC);
|
|
if (IS_ERR(rdma_cm_id)) {
|
|
pr_err("RDMA/CM ID creation failed: %ld\n",
|
|
PTR_ERR(rdma_cm_id));
|
|
goto out;
|
|
}
|
|
|
|
ret = rdma_bind_addr(rdma_cm_id, listen_addr);
|
|
if (ret) {
|
|
char addr_str[64];
|
|
|
|
snprintf(addr_str, sizeof(addr_str), "%pISp", listen_addr);
|
|
pr_err("Binding RDMA/CM ID to address %s failed: %d\n",
|
|
addr_str, ret);
|
|
rdma_destroy_id(rdma_cm_id);
|
|
rdma_cm_id = ERR_PTR(ret);
|
|
goto out;
|
|
}
|
|
|
|
ret = rdma_listen(rdma_cm_id, 128);
|
|
if (ret) {
|
|
pr_err("rdma_listen() failed: %d\n", ret);
|
|
rdma_destroy_id(rdma_cm_id);
|
|
rdma_cm_id = ERR_PTR(ret);
|
|
}
|
|
|
|
out:
|
|
return rdma_cm_id;
|
|
}
|
|
|
|
static ssize_t srpt_rdma_cm_port_show(struct config_item *item, char *page)
|
|
{
|
|
return sysfs_emit(page, "%d\n", rdma_cm_port);
|
|
}
|
|
|
|
static ssize_t srpt_rdma_cm_port_store(struct config_item *item,
|
|
const char *page, size_t count)
|
|
{
|
|
struct sockaddr_in addr4 = { .sin_family = AF_INET };
|
|
struct sockaddr_in6 addr6 = { .sin6_family = AF_INET6 };
|
|
struct rdma_cm_id *new_id = NULL;
|
|
u16 val;
|
|
int ret;
|
|
|
|
ret = kstrtou16(page, 0, &val);
|
|
if (ret < 0)
|
|
return ret;
|
|
ret = count;
|
|
if (rdma_cm_port == val)
|
|
goto out;
|
|
|
|
if (val) {
|
|
addr6.sin6_port = cpu_to_be16(val);
|
|
new_id = srpt_create_rdma_id((struct sockaddr *)&addr6);
|
|
if (IS_ERR(new_id)) {
|
|
addr4.sin_port = cpu_to_be16(val);
|
|
new_id = srpt_create_rdma_id((struct sockaddr *)&addr4);
|
|
if (IS_ERR(new_id)) {
|
|
ret = PTR_ERR(new_id);
|
|
goto out;
|
|
}
|
|
}
|
|
}
|
|
|
|
mutex_lock(&rdma_cm_mutex);
|
|
rdma_cm_port = val;
|
|
swap(rdma_cm_id, new_id);
|
|
mutex_unlock(&rdma_cm_mutex);
|
|
|
|
if (new_id)
|
|
rdma_destroy_id(new_id);
|
|
ret = count;
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
CONFIGFS_ATTR(srpt_, rdma_cm_port);
|
|
|
|
static struct configfs_attribute *srpt_da_attrs[] = {
|
|
&srpt_attr_rdma_cm_port,
|
|
NULL,
|
|
};
|
|
|
|
static int srpt_enable_tpg(struct se_portal_group *se_tpg, bool enable)
|
|
{
|
|
struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);
|
|
|
|
mutex_lock(&sport->mutex);
|
|
srpt_set_enabled(sport, enable);
|
|
mutex_unlock(&sport->mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* srpt_make_tpg - configfs callback invoked for mkdir /sys/kernel/config/target/$driver/$port/$tpg
|
|
* @wwn: Corresponds to $driver/$port.
|
|
* @name: $tpg.
|
|
*/
|
|
static struct se_portal_group *srpt_make_tpg(struct se_wwn *wwn,
|
|
const char *name)
|
|
{
|
|
struct srpt_port_id *sport_id = srpt_wwn_to_sport_id(wwn);
|
|
struct srpt_tpg *stpg;
|
|
int res = -ENOMEM;
|
|
|
|
stpg = kzalloc(sizeof(*stpg), GFP_KERNEL);
|
|
if (!stpg)
|
|
return ERR_PTR(res);
|
|
stpg->sport_id = sport_id;
|
|
res = core_tpg_register(wwn, &stpg->tpg, SCSI_PROTOCOL_SRP);
|
|
if (res) {
|
|
kfree(stpg);
|
|
return ERR_PTR(res);
|
|
}
|
|
|
|
mutex_lock(&sport_id->mutex);
|
|
list_add_tail(&stpg->entry, &sport_id->tpg_list);
|
|
mutex_unlock(&sport_id->mutex);
|
|
|
|
return &stpg->tpg;
|
|
}
|
|
|
|
/**
|
|
* srpt_drop_tpg - configfs callback invoked for rmdir /sys/kernel/config/target/$driver/$port/$tpg
|
|
* @tpg: Target portal group to deregister.
|
|
*/
|
|
static void srpt_drop_tpg(struct se_portal_group *tpg)
|
|
{
|
|
struct srpt_tpg *stpg = container_of(tpg, typeof(*stpg), tpg);
|
|
struct srpt_port_id *sport_id = stpg->sport_id;
|
|
struct srpt_port *sport = srpt_tpg_to_sport(tpg);
|
|
|
|
mutex_lock(&sport_id->mutex);
|
|
list_del(&stpg->entry);
|
|
mutex_unlock(&sport_id->mutex);
|
|
|
|
sport->enabled = false;
|
|
core_tpg_deregister(tpg);
|
|
kfree(stpg);
|
|
}
|
|
|
|
/**
|
|
* srpt_make_tport - configfs callback invoked for mkdir /sys/kernel/config/target/$driver/$port
|
|
* @tf: Not used.
|
|
* @group: Not used.
|
|
* @name: $port.
|
|
*/
|
|
static struct se_wwn *srpt_make_tport(struct target_fabric_configfs *tf,
|
|
struct config_group *group,
|
|
const char *name)
|
|
{
|
|
struct port_and_port_id papi = srpt_lookup_port(name);
|
|
struct srpt_port *sport = papi.sport;
|
|
struct srpt_port_id *port_id;
|
|
|
|
if (!papi.port_id)
|
|
return ERR_PTR(-EINVAL);
|
|
if (*papi.port_id) {
|
|
/* Attempt to create a directory that already exists. */
|
|
WARN_ON_ONCE(true);
|
|
return &(*papi.port_id)->wwn;
|
|
}
|
|
port_id = kzalloc(sizeof(*port_id), GFP_KERNEL);
|
|
if (!port_id) {
|
|
srpt_sdev_put(sport->sdev);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
mutex_init(&port_id->mutex);
|
|
INIT_LIST_HEAD(&port_id->tpg_list);
|
|
port_id->wwn.priv = sport;
|
|
memcpy(port_id->name, port_id == sport->guid_id ? sport->guid_name :
|
|
sport->gid_name, ARRAY_SIZE(port_id->name));
|
|
|
|
*papi.port_id = port_id;
|
|
|
|
return &port_id->wwn;
|
|
}
|
|
|
|
/**
|
|
* srpt_drop_tport - configfs callback invoked for rmdir /sys/kernel/config/target/$driver/$port
|
|
* @wwn: $port.
|
|
*/
|
|
static void srpt_drop_tport(struct se_wwn *wwn)
|
|
{
|
|
struct srpt_port_id *port_id = container_of(wwn, typeof(*port_id), wwn);
|
|
struct srpt_port *sport = wwn->priv;
|
|
|
|
if (sport->guid_id == port_id)
|
|
sport->guid_id = NULL;
|
|
else if (sport->gid_id == port_id)
|
|
sport->gid_id = NULL;
|
|
else
|
|
WARN_ON_ONCE(true);
|
|
|
|
srpt_sdev_put(sport->sdev);
|
|
kfree(port_id);
|
|
}
|
|
|
|
static ssize_t srpt_wwn_version_show(struct config_item *item, char *buf)
|
|
{
|
|
return sysfs_emit(buf, "\n");
|
|
}
|
|
|
|
CONFIGFS_ATTR_RO(srpt_wwn_, version);
|
|
|
|
static struct configfs_attribute *srpt_wwn_attrs[] = {
|
|
&srpt_wwn_attr_version,
|
|
NULL,
|
|
};
|
|
|
|
static const struct target_core_fabric_ops srpt_template = {
|
|
.module = THIS_MODULE,
|
|
.fabric_name = "srpt",
|
|
.tpg_get_wwn = srpt_get_fabric_wwn,
|
|
.tpg_get_tag = srpt_get_tag,
|
|
.tpg_check_demo_mode = srpt_check_false,
|
|
.tpg_check_demo_mode_cache = srpt_check_true,
|
|
.tpg_check_demo_mode_write_protect = srpt_check_true,
|
|
.tpg_check_prod_mode_write_protect = srpt_check_false,
|
|
.tpg_get_inst_index = srpt_tpg_get_inst_index,
|
|
.release_cmd = srpt_release_cmd,
|
|
.check_stop_free = srpt_check_stop_free,
|
|
.close_session = srpt_close_session,
|
|
.sess_get_index = srpt_sess_get_index,
|
|
.sess_get_initiator_sid = NULL,
|
|
.write_pending = srpt_write_pending,
|
|
.set_default_node_attributes = srpt_set_default_node_attrs,
|
|
.get_cmd_state = srpt_get_tcm_cmd_state,
|
|
.queue_data_in = srpt_queue_data_in,
|
|
.queue_status = srpt_queue_status,
|
|
.queue_tm_rsp = srpt_queue_tm_rsp,
|
|
.aborted_task = srpt_aborted_task,
|
|
/*
|
|
* Setup function pointers for generic logic in
|
|
* target_core_fabric_configfs.c
|
|
*/
|
|
.fabric_make_wwn = srpt_make_tport,
|
|
.fabric_drop_wwn = srpt_drop_tport,
|
|
.fabric_make_tpg = srpt_make_tpg,
|
|
.fabric_enable_tpg = srpt_enable_tpg,
|
|
.fabric_drop_tpg = srpt_drop_tpg,
|
|
.fabric_init_nodeacl = srpt_init_nodeacl,
|
|
|
|
.tfc_discovery_attrs = srpt_da_attrs,
|
|
.tfc_wwn_attrs = srpt_wwn_attrs,
|
|
.tfc_tpg_attrib_attrs = srpt_tpg_attrib_attrs,
|
|
};
|
|
|
|
/**
|
|
* srpt_init_module - kernel module initialization
|
|
*
|
|
* Note: Since ib_register_client() registers callback functions, and since at
|
|
* least one of these callback functions (srpt_add_one()) calls target core
|
|
* functions, this driver must be registered with the target core before
|
|
* ib_register_client() is called.
|
|
*/
|
|
static int __init srpt_init_module(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = -EINVAL;
|
|
if (srp_max_req_size < MIN_MAX_REQ_SIZE) {
|
|
pr_err("invalid value %d for kernel module parameter srp_max_req_size -- must be at least %d.\n",
|
|
srp_max_req_size, MIN_MAX_REQ_SIZE);
|
|
goto out;
|
|
}
|
|
|
|
if (srpt_srq_size < MIN_SRPT_SRQ_SIZE
|
|
|| srpt_srq_size > MAX_SRPT_SRQ_SIZE) {
|
|
pr_err("invalid value %d for kernel module parameter srpt_srq_size -- must be in the range [%d..%d].\n",
|
|
srpt_srq_size, MIN_SRPT_SRQ_SIZE, MAX_SRPT_SRQ_SIZE);
|
|
goto out;
|
|
}
|
|
|
|
ret = target_register_template(&srpt_template);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = ib_register_client(&srpt_client);
|
|
if (ret) {
|
|
pr_err("couldn't register IB client\n");
|
|
goto out_unregister_target;
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_unregister_target:
|
|
target_unregister_template(&srpt_template);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static void __exit srpt_cleanup_module(void)
|
|
{
|
|
if (rdma_cm_id)
|
|
rdma_destroy_id(rdma_cm_id);
|
|
ib_unregister_client(&srpt_client);
|
|
target_unregister_template(&srpt_template);
|
|
}
|
|
|
|
module_init(srpt_init_module);
|
|
module_exit(srpt_cleanup_module);
|