415 lines
11 KiB
C
415 lines
11 KiB
C
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/*
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* Copyright 2014 Cisco Systems, Inc. All rights reserved.
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*
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* This program is free software; you may redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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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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#ifndef _SNIC_H_
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#define _SNIC_H_
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#include <linux/module.h>
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#include <linux/netdevice.h>
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#include <linux/workqueue.h>
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#include <linux/bitops.h>
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#include <linux/mempool.h>
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#include <scsi/scsi_cmnd.h>
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#include <scsi/scsi.h>
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#include <scsi/scsi_host.h>
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#include "snic_disc.h"
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#include "snic_io.h"
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#include "snic_res.h"
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#include "snic_trc.h"
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#include "snic_stats.h"
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#include "vnic_dev.h"
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#include "vnic_wq.h"
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#include "vnic_cq.h"
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#include "vnic_intr.h"
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#include "vnic_stats.h"
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#include "vnic_snic.h"
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#define SNIC_DRV_NAME "snic"
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#define SNIC_DRV_DESCRIPTION "Cisco SCSI NIC Driver"
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#define SNIC_DRV_VERSION "0.0.1.18"
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#define PFX SNIC_DRV_NAME ":"
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#define DFX SNIC_DRV_NAME "%d: "
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#define DESC_CLEAN_LOW_WATERMARK 8
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#define SNIC_UCSM_DFLT_THROTTLE_CNT_BLD 16 /* UCSM default throttle count */
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#define SNIC_MAX_IO_REQ 50 /* scsi_cmnd tag map entries */
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#define SNIC_MIN_IO_REQ 8 /* Min IO throttle count */
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#define SNIC_IO_LOCKS 64 /* IO locks: power of 2 */
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#define SNIC_DFLT_QUEUE_DEPTH 32 /* Default Queue Depth */
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#define SNIC_MAX_QUEUE_DEPTH 64 /* Max Queue Depth */
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#define SNIC_DFLT_CMD_TIMEOUT 90 /* Extended tmo for FW */
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/*
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* Tag bits used for special requests.
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*/
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#define SNIC_TAG_ABORT BIT(30) /* Tag indicating abort */
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#define SNIC_TAG_DEV_RST BIT(29) /* Tag for device reset */
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#define SNIC_TAG_IOCTL_DEV_RST BIT(28) /* Tag for User Device Reset */
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#define SNIC_TAG_MASK (BIT(24) - 1) /* Mask for lookup */
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#define SNIC_NO_TAG -1
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/*
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* Command flags to identify the type of command and for other future use
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*/
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#define SNIC_NO_FLAGS 0
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#define SNIC_IO_INITIALIZED BIT(0)
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#define SNIC_IO_ISSUED BIT(1)
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#define SNIC_IO_DONE BIT(2)
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#define SNIC_IO_REQ_NULL BIT(3)
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#define SNIC_IO_ABTS_PENDING BIT(4)
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#define SNIC_IO_ABORTED BIT(5)
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#define SNIC_IO_ABTS_ISSUED BIT(6)
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#define SNIC_IO_TERM_ISSUED BIT(7)
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#define SNIC_IO_ABTS_TIMEDOUT BIT(8)
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#define SNIC_IO_ABTS_TERM_DONE BIT(9)
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#define SNIC_IO_ABTS_TERM_REQ_NULL BIT(10)
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#define SNIC_IO_ABTS_TERM_TIMEDOUT BIT(11)
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#define SNIC_IO_INTERNAL_TERM_PENDING BIT(12)
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#define SNIC_IO_INTERNAL_TERM_ISSUED BIT(13)
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#define SNIC_DEVICE_RESET BIT(14)
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#define SNIC_DEV_RST_ISSUED BIT(15)
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#define SNIC_DEV_RST_TIMEDOUT BIT(16)
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#define SNIC_DEV_RST_ABTS_ISSUED BIT(17)
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#define SNIC_DEV_RST_TERM_ISSUED BIT(18)
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#define SNIC_DEV_RST_DONE BIT(19)
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#define SNIC_DEV_RST_REQ_NULL BIT(20)
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#define SNIC_DEV_RST_ABTS_DONE BIT(21)
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#define SNIC_DEV_RST_TERM_DONE BIT(22)
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#define SNIC_DEV_RST_ABTS_PENDING BIT(23)
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#define SNIC_DEV_RST_PENDING BIT(24)
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#define SNIC_DEV_RST_NOTSUP BIT(25)
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#define SNIC_SCSI_CLEANUP BIT(26)
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#define SNIC_HOST_RESET_ISSUED BIT(27)
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#define SNIC_ABTS_TIMEOUT 30000 /* msec */
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#define SNIC_LUN_RESET_TIMEOUT 30000 /* msec */
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#define SNIC_HOST_RESET_TIMEOUT 30000 /* msec */
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/*
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* These are protected by the hashed req_lock.
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*/
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#define CMD_SP(Cmnd) \
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(((struct snic_internal_io_state *)scsi_cmd_priv(Cmnd))->rqi)
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#define CMD_STATE(Cmnd) \
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(((struct snic_internal_io_state *)scsi_cmd_priv(Cmnd))->state)
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#define CMD_ABTS_STATUS(Cmnd) \
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(((struct snic_internal_io_state *)scsi_cmd_priv(Cmnd))->abts_status)
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#define CMD_LR_STATUS(Cmnd) \
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(((struct snic_internal_io_state *)scsi_cmd_priv(Cmnd))->lr_status)
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#define CMD_FLAGS(Cmnd) \
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(((struct snic_internal_io_state *)scsi_cmd_priv(Cmnd))->flags)
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#define SNIC_INVALID_CODE 0x100 /* Hdr Status val unused by firmware */
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#define SNIC_MAX_TARGET 256
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#define SNIC_FLAGS_NONE (0)
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/* snic module params */
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extern unsigned int snic_max_qdepth;
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/* snic debugging */
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extern unsigned int snic_log_level;
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#define SNIC_MAIN_LOGGING 0x1
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#define SNIC_SCSI_LOGGING 0x2
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#define SNIC_ISR_LOGGING 0x8
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#define SNIC_DESC_LOGGING 0x10
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#define SNIC_CHECK_LOGGING(LEVEL, CMD) \
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do { \
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if (unlikely(snic_log_level & LEVEL)) \
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do { \
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CMD; \
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} while (0); \
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} while (0)
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#define SNIC_MAIN_DBG(host, fmt, args...) \
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SNIC_CHECK_LOGGING(SNIC_MAIN_LOGGING, \
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shost_printk(KERN_INFO, host, fmt, ## args);)
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#define SNIC_SCSI_DBG(host, fmt, args...) \
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SNIC_CHECK_LOGGING(SNIC_SCSI_LOGGING, \
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shost_printk(KERN_INFO, host, fmt, ##args);)
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#define SNIC_DISC_DBG(host, fmt, args...) \
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SNIC_CHECK_LOGGING(SNIC_SCSI_LOGGING, \
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shost_printk(KERN_INFO, host, fmt, ##args);)
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#define SNIC_ISR_DBG(host, fmt, args...) \
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SNIC_CHECK_LOGGING(SNIC_ISR_LOGGING, \
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shost_printk(KERN_INFO, host, fmt, ##args);)
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#define SNIC_HOST_ERR(host, fmt, args...) \
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shost_printk(KERN_ERR, host, fmt, ##args)
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#define SNIC_HOST_INFO(host, fmt, args...) \
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shost_printk(KERN_INFO, host, fmt, ##args)
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#define SNIC_INFO(fmt, args...) \
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pr_info(PFX fmt, ## args)
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#define SNIC_DBG(fmt, args...) \
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pr_info(PFX fmt, ## args)
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#define SNIC_ERR(fmt, args...) \
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pr_err(PFX fmt, ## args)
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#ifdef DEBUG
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#define SNIC_BUG_ON(EXPR) \
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({ \
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if (EXPR) { \
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SNIC_ERR("SNIC BUG(%s)\n", #EXPR); \
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BUG_ON(EXPR); \
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} \
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})
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#else
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#define SNIC_BUG_ON(EXPR) \
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({ \
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if (EXPR) { \
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SNIC_ERR("SNIC BUG(%s) at %s : %d\n", \
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#EXPR, __func__, __LINE__); \
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WARN_ON_ONCE(EXPR); \
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} \
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})
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#endif
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/* Soft assert */
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#define SNIC_ASSERT_NOT_IMPL(EXPR) \
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({ \
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if (EXPR) {\
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SNIC_INFO("Functionality not impl'ed at %s:%d\n", \
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__func__, __LINE__); \
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WARN_ON_ONCE(EXPR); \
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} \
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})
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extern const char *snic_state_str[];
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enum snic_intx_intr_index {
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SNIC_INTX_WQ_RQ_COPYWQ,
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SNIC_INTX_ERR,
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SNIC_INTX_NOTIFY,
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SNIC_INTX_INTR_MAX,
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};
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enum snic_msix_intr_index {
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SNIC_MSIX_WQ,
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SNIC_MSIX_IO_CMPL,
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SNIC_MSIX_ERR_NOTIFY,
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SNIC_MSIX_INTR_MAX,
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};
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struct snic_msix_entry {
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int requested;
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char devname[IFNAMSIZ];
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irqreturn_t (*isr)(int, void *);
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void *devid;
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};
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enum snic_state {
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SNIC_INIT = 0,
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SNIC_ERROR,
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SNIC_ONLINE,
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SNIC_OFFLINE,
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SNIC_FWRESET,
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};
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#define SNIC_WQ_MAX 1
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#define SNIC_CQ_IO_CMPL_MAX 1
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#define SNIC_CQ_MAX (SNIC_WQ_MAX + SNIC_CQ_IO_CMPL_MAX)
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/* firmware version information */
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struct snic_fw_info {
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u32 fw_ver;
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u32 hid; /* u16 hid | u16 vnic id */
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u32 max_concur_ios; /* max concurrent ios */
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u32 max_sgs_per_cmd; /* max sgls per IO */
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u32 max_io_sz; /* max io size supported */
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u32 hba_cap; /* hba capabilities */
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u32 max_tgts; /* max tgts supported */
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u16 io_tmo; /* FW Extended timeout */
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struct completion *wait; /* protected by snic lock*/
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};
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/*
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* snic_work item : defined to process asynchronous events
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*/
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struct snic_work {
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struct work_struct work;
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u16 ev_id;
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u64 *ev_data;
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};
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/*
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* snic structure to represent SCSI vNIC
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*/
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struct snic {
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/* snic specific members */
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struct list_head list;
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char name[IFNAMSIZ];
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atomic_t state;
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spinlock_t snic_lock;
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struct completion *remove_wait;
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bool in_remove;
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bool stop_link_events; /* stop processing link events */
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/* discovery related */
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struct snic_disc disc;
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/* Scsi Host info */
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struct Scsi_Host *shost;
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/* vnic related structures */
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struct vnic_dev_bar bar0;
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struct vnic_stats *stats;
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unsigned long stats_time;
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unsigned long stats_reset_time;
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struct vnic_dev *vdev;
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/* hw resource info */
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unsigned int wq_count;
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unsigned int cq_count;
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unsigned int intr_count;
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unsigned int err_intr_offset;
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int link_status; /* retrieved from svnic_dev_link_status() */
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u32 link_down_cnt;
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/* pci related */
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struct pci_dev *pdev;
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struct msix_entry msix_entry[SNIC_MSIX_INTR_MAX];
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struct snic_msix_entry msix[SNIC_MSIX_INTR_MAX];
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/* io related info */
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mempool_t *req_pool[SNIC_REQ_MAX_CACHES]; /* (??) */
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____cacheline_aligned spinlock_t io_req_lock[SNIC_IO_LOCKS];
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/* Maintain snic specific commands, cmds with no tag in spl_cmd_list */
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____cacheline_aligned spinlock_t spl_cmd_lock;
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struct list_head spl_cmd_list;
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unsigned int max_tag_id;
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atomic_t ios_inflight; /* io in flight counter */
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struct vnic_snic_config config;
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struct work_struct link_work;
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/* firmware information */
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struct snic_fw_info fwinfo;
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/* Work for processing Target related work */
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struct work_struct tgt_work;
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/* Work for processing Discovery */
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struct work_struct disc_work;
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/* stats related */
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unsigned int reset_stats;
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atomic64_t io_cmpl_skip;
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struct snic_stats s_stats; /* Per SNIC driver stats */
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/* platform specific */
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#ifdef CONFIG_SCSI_SNIC_DEBUG_FS
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struct dentry *stats_host; /* Per snic debugfs root */
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struct dentry *stats_file; /* Per snic debugfs file */
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struct dentry *reset_stats_file;/* Per snic reset stats file */
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#endif
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/* completion queue cache line section */
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____cacheline_aligned struct vnic_cq cq[SNIC_CQ_MAX];
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/* work queue cache line section */
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____cacheline_aligned struct vnic_wq wq[SNIC_WQ_MAX];
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spinlock_t wq_lock[SNIC_WQ_MAX];
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/* interrupt resource cache line section */
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____cacheline_aligned struct vnic_intr intr[SNIC_MSIX_INTR_MAX];
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}; /* end of snic structure */
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/*
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* SNIC Driver's Global Data
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*/
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struct snic_global {
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struct list_head snic_list;
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spinlock_t snic_list_lock;
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||
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||
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|
struct kmem_cache *req_cache[SNIC_REQ_MAX_CACHES];
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||
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|
||
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|
struct workqueue_struct *event_q;
|
||
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|
||
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|
#ifdef CONFIG_SCSI_SNIC_DEBUG_FS
|
||
|
|
/* debugfs related global data */
|
||
|
|
struct dentry *trc_root;
|
||
|
|
struct dentry *stats_root;
|
||
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|
|
||
|
|
struct snic_trc trc ____cacheline_aligned;
|
||
|
|
#endif
|
||
|
|
};
|
||
|
|
|
||
|
|
extern struct snic_global *snic_glob;
|
||
|
|
|
||
|
|
int snic_glob_init(void);
|
||
|
|
void snic_glob_cleanup(void);
|
||
|
|
|
||
|
|
extern struct workqueue_struct *snic_event_queue;
|
||
|
|
extern struct device_attribute *snic_attrs[];
|
||
|
|
|
||
|
|
int snic_queuecommand(struct Scsi_Host *, struct scsi_cmnd *);
|
||
|
|
int snic_abort_cmd(struct scsi_cmnd *);
|
||
|
|
int snic_device_reset(struct scsi_cmnd *);
|
||
|
|
int snic_host_reset(struct scsi_cmnd *);
|
||
|
|
int snic_reset(struct Scsi_Host *, struct scsi_cmnd *);
|
||
|
|
void snic_shutdown_scsi_cleanup(struct snic *);
|
||
|
|
|
||
|
|
|
||
|
|
int snic_request_intr(struct snic *);
|
||
|
|
void snic_free_intr(struct snic *);
|
||
|
|
int snic_set_intr_mode(struct snic *);
|
||
|
|
void snic_clear_intr_mode(struct snic *);
|
||
|
|
|
||
|
|
int snic_fwcq_cmpl_handler(struct snic *, int);
|
||
|
|
int snic_wq_cmpl_handler(struct snic *, int);
|
||
|
|
void snic_free_wq_buf(struct vnic_wq *, struct vnic_wq_buf *);
|
||
|
|
|
||
|
|
|
||
|
|
void snic_log_q_error(struct snic *);
|
||
|
|
void snic_handle_link_event(struct snic *);
|
||
|
|
void snic_handle_link(struct work_struct *);
|
||
|
|
|
||
|
|
int snic_queue_exch_ver_req(struct snic *);
|
||
|
|
int snic_io_exch_ver_cmpl_handler(struct snic *, struct snic_fw_req *);
|
||
|
|
|
||
|
|
int snic_queue_wq_desc(struct snic *, void *os_buf, u16 len);
|
||
|
|
|
||
|
|
void snic_handle_untagged_req(struct snic *, struct snic_req_info *);
|
||
|
|
void snic_release_untagged_req(struct snic *, struct snic_req_info *);
|
||
|
|
void snic_free_all_untagged_reqs(struct snic *);
|
||
|
|
int snic_get_conf(struct snic *);
|
||
|
|
void snic_set_state(struct snic *, enum snic_state);
|
||
|
|
int snic_get_state(struct snic *);
|
||
|
|
const char *snic_state_to_str(unsigned int);
|
||
|
|
void snic_hex_dump(char *, char *, int);
|
||
|
|
void snic_print_desc(const char *fn, char *os_buf, int len);
|
||
|
|
const char *show_opcode_name(int val);
|
||
|
|
#endif /* _SNIC_H */
|