241 lines
6.6 KiB
C
241 lines
6.6 KiB
C
/*
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* Discovery service for the NVMe over Fabrics target.
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* Copyright (C) 2016 Intel Corporation. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/slab.h>
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#include <generated/utsrelease.h>
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#include "nvmet.h"
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struct nvmet_subsys *nvmet_disc_subsys;
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u64 nvmet_genctr;
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void nvmet_referral_enable(struct nvmet_port *parent, struct nvmet_port *port)
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{
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down_write(&nvmet_config_sem);
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if (list_empty(&port->entry)) {
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list_add_tail(&port->entry, &parent->referrals);
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port->enabled = true;
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nvmet_genctr++;
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}
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up_write(&nvmet_config_sem);
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}
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void nvmet_referral_disable(struct nvmet_port *port)
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{
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down_write(&nvmet_config_sem);
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if (!list_empty(&port->entry)) {
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port->enabled = false;
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list_del_init(&port->entry);
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nvmet_genctr++;
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}
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up_write(&nvmet_config_sem);
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}
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static void nvmet_format_discovery_entry(struct nvmf_disc_rsp_page_hdr *hdr,
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struct nvmet_port *port, char *subsys_nqn, char *traddr,
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u8 type, u32 numrec)
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{
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struct nvmf_disc_rsp_page_entry *e = &hdr->entries[numrec];
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e->trtype = port->disc_addr.trtype;
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e->adrfam = port->disc_addr.adrfam;
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e->treq = port->disc_addr.treq;
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e->portid = port->disc_addr.portid;
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/* we support only dynamic controllers */
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e->cntlid = cpu_to_le16(NVME_CNTLID_DYNAMIC);
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e->asqsz = cpu_to_le16(NVME_AQ_DEPTH);
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e->subtype = type;
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memcpy(e->trsvcid, port->disc_addr.trsvcid, NVMF_TRSVCID_SIZE);
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memcpy(e->traddr, traddr, NVMF_TRADDR_SIZE);
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memcpy(e->tsas.common, port->disc_addr.tsas.common, NVMF_TSAS_SIZE);
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strncpy(e->subnqn, subsys_nqn, NVMF_NQN_SIZE);
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}
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/*
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* nvmet_set_disc_traddr - set a correct discovery log entry traddr
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*
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* IP based transports (e.g RDMA) can listen on "any" ipv4/ipv6 addresses
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* (INADDR_ANY or IN6ADDR_ANY_INIT). The discovery log page traddr reply
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* must not contain that "any" IP address. If the transport implements
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* .disc_traddr, use it. this callback will set the discovery traddr
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* from the req->port address in case the port in question listens
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* "any" IP address.
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*/
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static void nvmet_set_disc_traddr(struct nvmet_req *req, struct nvmet_port *port,
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char *traddr)
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{
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if (req->ops->disc_traddr)
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req->ops->disc_traddr(req, port, traddr);
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else
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memcpy(traddr, port->disc_addr.traddr, NVMF_TRADDR_SIZE);
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}
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static void nvmet_execute_get_disc_log_page(struct nvmet_req *req)
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{
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const int entry_size = sizeof(struct nvmf_disc_rsp_page_entry);
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struct nvmet_ctrl *ctrl = req->sq->ctrl;
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struct nvmf_disc_rsp_page_hdr *hdr;
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size_t data_len = nvmet_get_log_page_len(req->cmd);
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size_t alloc_len = max(data_len, sizeof(*hdr));
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int residual_len = data_len - sizeof(*hdr);
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struct nvmet_subsys_link *p;
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struct nvmet_port *r;
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u32 numrec = 0;
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u16 status = 0;
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/*
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* Make sure we're passing at least a buffer of response header size.
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* If host provided data len is less than the header size, only the
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* number of bytes requested by host will be sent to host.
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*/
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hdr = kzalloc(alloc_len, GFP_KERNEL);
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if (!hdr) {
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status = NVME_SC_INTERNAL;
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goto out;
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}
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down_read(&nvmet_config_sem);
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list_for_each_entry(p, &req->port->subsystems, entry) {
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if (!nvmet_host_allowed(req, p->subsys, ctrl->hostnqn))
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continue;
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if (residual_len >= entry_size) {
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char traddr[NVMF_TRADDR_SIZE];
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nvmet_set_disc_traddr(req, req->port, traddr);
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nvmet_format_discovery_entry(hdr, req->port,
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p->subsys->subsysnqn, traddr,
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NVME_NQN_NVME, numrec);
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residual_len -= entry_size;
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}
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numrec++;
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}
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list_for_each_entry(r, &req->port->referrals, entry) {
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if (residual_len >= entry_size) {
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nvmet_format_discovery_entry(hdr, r,
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NVME_DISC_SUBSYS_NAME,
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r->disc_addr.traddr,
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NVME_NQN_DISC, numrec);
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residual_len -= entry_size;
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}
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numrec++;
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}
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hdr->genctr = cpu_to_le64(nvmet_genctr);
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hdr->numrec = cpu_to_le64(numrec);
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hdr->recfmt = cpu_to_le16(0);
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up_read(&nvmet_config_sem);
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status = nvmet_copy_to_sgl(req, 0, hdr, data_len);
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kfree(hdr);
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out:
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nvmet_req_complete(req, status);
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}
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static void nvmet_execute_identify_disc_ctrl(struct nvmet_req *req)
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{
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struct nvmet_ctrl *ctrl = req->sq->ctrl;
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struct nvme_id_ctrl *id;
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u16 status = 0;
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id = kzalloc(sizeof(*id), GFP_KERNEL);
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if (!id) {
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status = NVME_SC_INTERNAL;
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goto out;
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}
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memset(id->fr, ' ', sizeof(id->fr));
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strncpy((char *)id->fr, UTS_RELEASE, sizeof(id->fr));
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/* no limit on data transfer sizes for now */
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id->mdts = 0;
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id->cntlid = cpu_to_le16(ctrl->cntlid);
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id->ver = cpu_to_le32(ctrl->subsys->ver);
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id->lpa = (1 << 2);
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/* no enforcement soft-limit for maxcmd - pick arbitrary high value */
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id->maxcmd = cpu_to_le16(NVMET_MAX_CMD);
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id->sgls = cpu_to_le32(1 << 0); /* we always support SGLs */
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if (ctrl->ops->has_keyed_sgls)
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id->sgls |= cpu_to_le32(1 << 2);
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if (req->port->inline_data_size)
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id->sgls |= cpu_to_le32(1 << 20);
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strcpy(id->subnqn, ctrl->subsys->subsysnqn);
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status = nvmet_copy_to_sgl(req, 0, id, sizeof(*id));
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kfree(id);
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out:
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nvmet_req_complete(req, status);
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}
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u16 nvmet_parse_discovery_cmd(struct nvmet_req *req)
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{
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struct nvme_command *cmd = req->cmd;
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if (unlikely(!(req->sq->ctrl->csts & NVME_CSTS_RDY))) {
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pr_err("got cmd %d while not ready\n",
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cmd->common.opcode);
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return NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
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}
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switch (cmd->common.opcode) {
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case nvme_admin_get_log_page:
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req->data_len = nvmet_get_log_page_len(cmd);
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switch (cmd->get_log_page.lid) {
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case NVME_LOG_DISC:
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req->execute = nvmet_execute_get_disc_log_page;
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return 0;
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default:
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pr_err("unsupported get_log_page lid %d\n",
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cmd->get_log_page.lid);
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return NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
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}
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case nvme_admin_identify:
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req->data_len = NVME_IDENTIFY_DATA_SIZE;
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switch (cmd->identify.cns) {
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case NVME_ID_CNS_CTRL:
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req->execute =
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nvmet_execute_identify_disc_ctrl;
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return 0;
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default:
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pr_err("unsupported identify cns %d\n",
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cmd->identify.cns);
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return NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
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}
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default:
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pr_err("unhandled cmd %d\n", cmd->common.opcode);
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return NVME_SC_INVALID_OPCODE | NVME_SC_DNR;
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}
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}
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int __init nvmet_init_discovery(void)
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{
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nvmet_disc_subsys =
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nvmet_subsys_alloc(NVME_DISC_SUBSYS_NAME, NVME_NQN_DISC);
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if (!nvmet_disc_subsys)
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return -ENOMEM;
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return 0;
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}
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void nvmet_exit_discovery(void)
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{
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nvmet_subsys_put(nvmet_disc_subsys);
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}
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