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OpenCloudOS-Kernel/drivers/scsi/qedf/qedf_io.c

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/*
* QLogic FCoE Offload Driver
* Copyright (c) 2016 Cavium Inc.
*
* This software is available under the terms of the GNU General Public License
* (GPL) Version 2, available from the file COPYING in the main directory of
* this source tree.
*/
#include <linux/spinlock.h>
#include <linux/vmalloc.h>
#include "qedf.h"
#include <scsi/scsi_tcq.h>
void qedf_cmd_timer_set(struct qedf_ctx *qedf, struct qedf_ioreq *io_req,
unsigned int timer_msec)
{
queue_delayed_work(qedf->timer_work_queue, &io_req->timeout_work,
msecs_to_jiffies(timer_msec));
}
static void qedf_cmd_timeout(struct work_struct *work)
{
struct qedf_ioreq *io_req =
container_of(work, struct qedf_ioreq, timeout_work.work);
struct qedf_ctx *qedf = io_req->fcport->qedf;
struct qedf_rport *fcport = io_req->fcport;
u8 op = 0;
switch (io_req->cmd_type) {
case QEDF_ABTS:
QEDF_ERR((&qedf->dbg_ctx), "ABTS timeout, xid=0x%x.\n",
io_req->xid);
/* Cleanup timed out ABTS */
qedf_initiate_cleanup(io_req, true);
complete(&io_req->abts_done);
/*
* Need to call kref_put for reference taken when initiate_abts
* was called since abts_compl won't be called now that we've
* cleaned up the task.
*/
kref_put(&io_req->refcount, qedf_release_cmd);
/*
* Now that the original I/O and the ABTS are complete see
* if we need to reconnect to the target.
*/
qedf_restart_rport(fcport);
break;
case QEDF_ELS:
kref_get(&io_req->refcount);
/*
* Don't attempt to clean an ELS timeout as any subseqeunt
* ABTS or cleanup requests just hang. For now just free
* the resources of the original I/O and the RRQ
*/
QEDF_ERR(&(qedf->dbg_ctx), "ELS timeout, xid=0x%x.\n",
io_req->xid);
io_req->event = QEDF_IOREQ_EV_ELS_TMO;
/* Call callback function to complete command */
if (io_req->cb_func && io_req->cb_arg) {
op = io_req->cb_arg->op;
io_req->cb_func(io_req->cb_arg);
io_req->cb_arg = NULL;
}
qedf_initiate_cleanup(io_req, true);
kref_put(&io_req->refcount, qedf_release_cmd);
break;
case QEDF_SEQ_CLEANUP:
QEDF_ERR(&(qedf->dbg_ctx), "Sequence cleanup timeout, "
"xid=0x%x.\n", io_req->xid);
qedf_initiate_cleanup(io_req, true);
io_req->event = QEDF_IOREQ_EV_ELS_TMO;
qedf_process_seq_cleanup_compl(qedf, NULL, io_req);
break;
default:
break;
}
}
void qedf_cmd_mgr_free(struct qedf_cmd_mgr *cmgr)
{
struct io_bdt *bdt_info;
struct qedf_ctx *qedf = cmgr->qedf;
size_t bd_tbl_sz;
u16 min_xid = QEDF_MIN_XID;
u16 max_xid = (FCOE_PARAMS_NUM_TASKS - 1);
int num_ios;
int i;
struct qedf_ioreq *io_req;
num_ios = max_xid - min_xid + 1;
/* Free fcoe_bdt_ctx structures */
if (!cmgr->io_bdt_pool)
goto free_cmd_pool;
bd_tbl_sz = QEDF_MAX_BDS_PER_CMD * sizeof(struct fcoe_sge);
for (i = 0; i < num_ios; i++) {
bdt_info = cmgr->io_bdt_pool[i];
if (bdt_info->bd_tbl) {
dma_free_coherent(&qedf->pdev->dev, bd_tbl_sz,
bdt_info->bd_tbl, bdt_info->bd_tbl_dma);
bdt_info->bd_tbl = NULL;
}
}
/* Destroy io_bdt pool */
for (i = 0; i < num_ios; i++) {
kfree(cmgr->io_bdt_pool[i]);
cmgr->io_bdt_pool[i] = NULL;
}
kfree(cmgr->io_bdt_pool);
cmgr->io_bdt_pool = NULL;
free_cmd_pool:
for (i = 0; i < num_ios; i++) {
io_req = &cmgr->cmds[i];
/* Make sure we free per command sense buffer */
if (io_req->sense_buffer)
dma_free_coherent(&qedf->pdev->dev,
QEDF_SCSI_SENSE_BUFFERSIZE, io_req->sense_buffer,
io_req->sense_buffer_dma);
cancel_delayed_work_sync(&io_req->rrq_work);
}
/* Free command manager itself */
vfree(cmgr);
}
static void qedf_handle_rrq(struct work_struct *work)
{
struct qedf_ioreq *io_req =
container_of(work, struct qedf_ioreq, rrq_work.work);
qedf_send_rrq(io_req);
}
struct qedf_cmd_mgr *qedf_cmd_mgr_alloc(struct qedf_ctx *qedf)
{
struct qedf_cmd_mgr *cmgr;
struct io_bdt *bdt_info;
struct qedf_ioreq *io_req;
u16 xid;
int i;
int num_ios;
u16 min_xid = QEDF_MIN_XID;
u16 max_xid = (FCOE_PARAMS_NUM_TASKS - 1);
/* Make sure num_queues is already set before calling this function */
if (!qedf->num_queues) {
QEDF_ERR(&(qedf->dbg_ctx), "num_queues is not set.\n");
return NULL;
}
if (max_xid <= min_xid || max_xid == FC_XID_UNKNOWN) {
QEDF_WARN(&(qedf->dbg_ctx), "Invalid min_xid 0x%x and "
"max_xid 0x%x.\n", min_xid, max_xid);
return NULL;
}
QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_DISC, "min xid 0x%x, max xid "
"0x%x.\n", min_xid, max_xid);
num_ios = max_xid - min_xid + 1;
cmgr = vzalloc(sizeof(struct qedf_cmd_mgr));
if (!cmgr) {
QEDF_WARN(&(qedf->dbg_ctx), "Failed to alloc cmd mgr.\n");
return NULL;
}
cmgr->qedf = qedf;
spin_lock_init(&cmgr->lock);
/*
* Initialize list of qedf_ioreq.
*/
xid = QEDF_MIN_XID;
for (i = 0; i < num_ios; i++) {
io_req = &cmgr->cmds[i];
INIT_DELAYED_WORK(&io_req->timeout_work, qedf_cmd_timeout);
io_req->xid = xid++;
INIT_DELAYED_WORK(&io_req->rrq_work, qedf_handle_rrq);
/* Allocate DMA memory to hold sense buffer */
io_req->sense_buffer = dma_alloc_coherent(&qedf->pdev->dev,
QEDF_SCSI_SENSE_BUFFERSIZE, &io_req->sense_buffer_dma,
GFP_KERNEL);
if (!io_req->sense_buffer)
goto mem_err;
}
/* Allocate pool of io_bdts - one for each qedf_ioreq */
cmgr->io_bdt_pool = kmalloc_array(num_ios, sizeof(struct io_bdt *),
GFP_KERNEL);
if (!cmgr->io_bdt_pool) {
QEDF_WARN(&(qedf->dbg_ctx), "Failed to alloc io_bdt_pool.\n");
goto mem_err;
}
for (i = 0; i < num_ios; i++) {
cmgr->io_bdt_pool[i] = kmalloc(sizeof(struct io_bdt),
GFP_KERNEL);
if (!cmgr->io_bdt_pool[i]) {
QEDF_WARN(&(qedf->dbg_ctx), "Failed to alloc "
"io_bdt_pool[%d].\n", i);
goto mem_err;
}
}
for (i = 0; i < num_ios; i++) {
bdt_info = cmgr->io_bdt_pool[i];
bdt_info->bd_tbl = dma_alloc_coherent(&qedf->pdev->dev,
QEDF_MAX_BDS_PER_CMD * sizeof(struct fcoe_sge),
&bdt_info->bd_tbl_dma, GFP_KERNEL);
if (!bdt_info->bd_tbl) {
QEDF_WARN(&(qedf->dbg_ctx), "Failed to alloc "
"bdt_tbl[%d].\n", i);
goto mem_err;
}
}
atomic_set(&cmgr->free_list_cnt, num_ios);
QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO,
"cmgr->free_list_cnt=%d.\n",
atomic_read(&cmgr->free_list_cnt));
return cmgr;
mem_err:
qedf_cmd_mgr_free(cmgr);
return NULL;
}
struct qedf_ioreq *qedf_alloc_cmd(struct qedf_rport *fcport, u8 cmd_type)
{
struct qedf_ctx *qedf = fcport->qedf;
struct qedf_cmd_mgr *cmd_mgr = qedf->cmd_mgr;
struct qedf_ioreq *io_req = NULL;
struct io_bdt *bd_tbl;
u16 xid;
uint32_t free_sqes;
int i;
unsigned long flags;
free_sqes = atomic_read(&fcport->free_sqes);
if (!free_sqes) {
QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO,
"Returning NULL, free_sqes=%d.\n ",
free_sqes);
goto out_failed;
}
/* Limit the number of outstanding R/W tasks */
if ((atomic_read(&fcport->num_active_ios) >=
NUM_RW_TASKS_PER_CONNECTION)) {
QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO,
"Returning NULL, num_active_ios=%d.\n",
atomic_read(&fcport->num_active_ios));
goto out_failed;
}
/* Limit global TIDs certain tasks */
if (atomic_read(&cmd_mgr->free_list_cnt) <= GBL_RSVD_TASKS) {
QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO,
"Returning NULL, free_list_cnt=%d.\n",
atomic_read(&cmd_mgr->free_list_cnt));
goto out_failed;
}
spin_lock_irqsave(&cmd_mgr->lock, flags);
for (i = 0; i < FCOE_PARAMS_NUM_TASKS; i++) {
io_req = &cmd_mgr->cmds[cmd_mgr->idx];
cmd_mgr->idx++;
if (cmd_mgr->idx == FCOE_PARAMS_NUM_TASKS)
cmd_mgr->idx = 0;
/* Check to make sure command was previously freed */
if (!test_bit(QEDF_CMD_OUTSTANDING, &io_req->flags))
break;
}
if (i == FCOE_PARAMS_NUM_TASKS) {
spin_unlock_irqrestore(&cmd_mgr->lock, flags);
goto out_failed;
}
set_bit(QEDF_CMD_OUTSTANDING, &io_req->flags);
spin_unlock_irqrestore(&cmd_mgr->lock, flags);
atomic_inc(&fcport->num_active_ios);
atomic_dec(&fcport->free_sqes);
xid = io_req->xid;
atomic_dec(&cmd_mgr->free_list_cnt);
io_req->cmd_mgr = cmd_mgr;
io_req->fcport = fcport;
/* Hold the io_req against deletion */
kref_init(&io_req->refcount);
/* Bind io_bdt for this io_req */
/* Have a static link between io_req and io_bdt_pool */
bd_tbl = io_req->bd_tbl = cmd_mgr->io_bdt_pool[xid];
if (bd_tbl == NULL) {
QEDF_ERR(&(qedf->dbg_ctx), "bd_tbl is NULL, xid=%x.\n", xid);
kref_put(&io_req->refcount, qedf_release_cmd);
goto out_failed;
}
bd_tbl->io_req = io_req;
io_req->cmd_type = cmd_type;
/* Reset sequence offset data */
io_req->rx_buf_off = 0;
io_req->tx_buf_off = 0;
io_req->rx_id = 0xffff; /* No OX_ID */
return io_req;
out_failed:
/* Record failure for stats and return NULL to caller */
qedf->alloc_failures++;
return NULL;
}
static void qedf_free_mp_resc(struct qedf_ioreq *io_req)
{
struct qedf_mp_req *mp_req = &(io_req->mp_req);
struct qedf_ctx *qedf = io_req->fcport->qedf;
uint64_t sz = sizeof(struct fcoe_sge);
/* clear tm flags */
mp_req->tm_flags = 0;
if (mp_req->mp_req_bd) {
dma_free_coherent(&qedf->pdev->dev, sz,
mp_req->mp_req_bd, mp_req->mp_req_bd_dma);
mp_req->mp_req_bd = NULL;
}
if (mp_req->mp_resp_bd) {
dma_free_coherent(&qedf->pdev->dev, sz,
mp_req->mp_resp_bd, mp_req->mp_resp_bd_dma);
mp_req->mp_resp_bd = NULL;
}
if (mp_req->req_buf) {
dma_free_coherent(&qedf->pdev->dev, QEDF_PAGE_SIZE,
mp_req->req_buf, mp_req->req_buf_dma);
mp_req->req_buf = NULL;
}
if (mp_req->resp_buf) {
dma_free_coherent(&qedf->pdev->dev, QEDF_PAGE_SIZE,
mp_req->resp_buf, mp_req->resp_buf_dma);
mp_req->resp_buf = NULL;
}
}
void qedf_release_cmd(struct kref *ref)
{
struct qedf_ioreq *io_req =
container_of(ref, struct qedf_ioreq, refcount);
struct qedf_cmd_mgr *cmd_mgr = io_req->cmd_mgr;
struct qedf_rport *fcport = io_req->fcport;
if (io_req->cmd_type == QEDF_ELS ||
io_req->cmd_type == QEDF_TASK_MGMT_CMD)
qedf_free_mp_resc(io_req);
atomic_inc(&cmd_mgr->free_list_cnt);
atomic_dec(&fcport->num_active_ios);
if (atomic_read(&fcport->num_active_ios) < 0)
QEDF_WARN(&(fcport->qedf->dbg_ctx), "active_ios < 0.\n");
/* Increment task retry identifier now that the request is released */
io_req->task_retry_identifier++;
clear_bit(QEDF_CMD_OUTSTANDING, &io_req->flags);
}
static int qedf_split_bd(struct qedf_ioreq *io_req, u64 addr, int sg_len,
int bd_index)
{
struct fcoe_sge *bd = io_req->bd_tbl->bd_tbl;
int frag_size, sg_frags;
sg_frags = 0;
while (sg_len) {
if (sg_len > QEDF_BD_SPLIT_SZ)
frag_size = QEDF_BD_SPLIT_SZ;
else
frag_size = sg_len;
bd[bd_index + sg_frags].sge_addr.lo = U64_LO(addr);
bd[bd_index + sg_frags].sge_addr.hi = U64_HI(addr);
bd[bd_index + sg_frags].size = (uint16_t)frag_size;
addr += (u64)frag_size;
sg_frags++;
sg_len -= frag_size;
}
return sg_frags;
}
static int qedf_map_sg(struct qedf_ioreq *io_req)
{
struct scsi_cmnd *sc = io_req->sc_cmd;
struct Scsi_Host *host = sc->device->host;
struct fc_lport *lport = shost_priv(host);
struct qedf_ctx *qedf = lport_priv(lport);
struct fcoe_sge *bd = io_req->bd_tbl->bd_tbl;
struct scatterlist *sg;
int byte_count = 0;
int sg_count = 0;
int bd_count = 0;
int sg_frags;
unsigned int sg_len;
u64 addr, end_addr;
int i;
sg_count = dma_map_sg(&qedf->pdev->dev, scsi_sglist(sc),
scsi_sg_count(sc), sc->sc_data_direction);
sg = scsi_sglist(sc);
/*
* New condition to send single SGE as cached-SGL with length less
* than 64k.
*/
if ((sg_count == 1) && (sg_dma_len(sg) <=
QEDF_MAX_SGLEN_FOR_CACHESGL)) {
sg_len = sg_dma_len(sg);
addr = (u64)sg_dma_address(sg);
bd[bd_count].sge_addr.lo = (addr & 0xffffffff);
bd[bd_count].sge_addr.hi = (addr >> 32);
bd[bd_count].size = (u16)sg_len;
return ++bd_count;
}
scsi_for_each_sg(sc, sg, sg_count, i) {
sg_len = sg_dma_len(sg);
addr = (u64)sg_dma_address(sg);
end_addr = (u64)(addr + sg_len);
/*
* First s/g element in the list so check if the end_addr
* is paged aligned. Also check to make sure the length is
* at least page size.
*/
if ((i == 0) && (sg_count > 1) &&
((end_addr % QEDF_PAGE_SIZE) ||
sg_len < QEDF_PAGE_SIZE))
io_req->use_slowpath = true;
/*
* Last s/g element so check if the start address is paged
* aligned.
*/
else if ((i == (sg_count - 1)) && (sg_count > 1) &&
(addr % QEDF_PAGE_SIZE))
io_req->use_slowpath = true;
/*
* Intermediate s/g element so check if start and end address
* is page aligned.
*/
else if ((i != 0) && (i != (sg_count - 1)) &&
((addr % QEDF_PAGE_SIZE) || (end_addr % QEDF_PAGE_SIZE)))
io_req->use_slowpath = true;
if (sg_len > QEDF_MAX_BD_LEN) {
sg_frags = qedf_split_bd(io_req, addr, sg_len,
bd_count);
} else {
sg_frags = 1;
bd[bd_count].sge_addr.lo = U64_LO(addr);
bd[bd_count].sge_addr.hi = U64_HI(addr);
bd[bd_count].size = (uint16_t)sg_len;
}
bd_count += sg_frags;
byte_count += sg_len;
}
if (byte_count != scsi_bufflen(sc))
QEDF_ERR(&(qedf->dbg_ctx), "byte_count = %d != "
"scsi_bufflen = %d, task_id = 0x%x.\n", byte_count,
scsi_bufflen(sc), io_req->xid);
return bd_count;
}
static int qedf_build_bd_list_from_sg(struct qedf_ioreq *io_req)
{
struct scsi_cmnd *sc = io_req->sc_cmd;
struct fcoe_sge *bd = io_req->bd_tbl->bd_tbl;
int bd_count;
if (scsi_sg_count(sc)) {
bd_count = qedf_map_sg(io_req);
if (bd_count == 0)
return -ENOMEM;
} else {
bd_count = 0;
bd[0].sge_addr.lo = bd[0].sge_addr.hi = 0;
bd[0].size = 0;
}
io_req->bd_tbl->bd_valid = bd_count;
return 0;
}
static void qedf_build_fcp_cmnd(struct qedf_ioreq *io_req,
struct fcp_cmnd *fcp_cmnd)
{
struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
/* fcp_cmnd is 32 bytes */
memset(fcp_cmnd, 0, FCP_CMND_LEN);
/* 8 bytes: SCSI LUN info */
int_to_scsilun(sc_cmd->device->lun,
(struct scsi_lun *)&fcp_cmnd->fc_lun);
/* 4 bytes: flag info */
fcp_cmnd->fc_pri_ta = 0;
fcp_cmnd->fc_tm_flags = io_req->mp_req.tm_flags;
fcp_cmnd->fc_flags = io_req->io_req_flags;
fcp_cmnd->fc_cmdref = 0;
/* Populate data direction */
if (sc_cmd->sc_data_direction == DMA_TO_DEVICE)
fcp_cmnd->fc_flags |= FCP_CFL_WRDATA;
else if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE)
fcp_cmnd->fc_flags |= FCP_CFL_RDDATA;
fcp_cmnd->fc_pri_ta = FCP_PTA_SIMPLE;
/* 16 bytes: CDB information */
memcpy(fcp_cmnd->fc_cdb, sc_cmd->cmnd, sc_cmd->cmd_len);
/* 4 bytes: FCP data length */
fcp_cmnd->fc_dl = htonl(io_req->data_xfer_len);
}
static void qedf_init_task(struct qedf_rport *fcport, struct fc_lport *lport,
struct qedf_ioreq *io_req, u32 *ptu_invalidate,
struct fcoe_task_context *task_ctx)
{
enum fcoe_task_type task_type;
struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
struct io_bdt *bd_tbl = io_req->bd_tbl;
union fcoe_data_desc_ctx *data_desc;
u32 *fcp_cmnd;
u32 tmp_fcp_cmnd[8];
int cnt, i;
int bd_count;
struct qedf_ctx *qedf = fcport->qedf;
uint16_t cq_idx = smp_processor_id() % qedf->num_queues;
u8 tmp_sgl_mode = 0;
u8 mst_sgl_mode = 0;
memset(task_ctx, 0, sizeof(struct fcoe_task_context));
io_req->task = task_ctx;
if (sc_cmd->sc_data_direction == DMA_TO_DEVICE)
task_type = FCOE_TASK_TYPE_WRITE_INITIATOR;
else
task_type = FCOE_TASK_TYPE_READ_INITIATOR;
/* Y Storm context */
task_ctx->ystorm_st_context.expect_first_xfer = 1;
task_ctx->ystorm_st_context.data_2_trns_rem = io_req->data_xfer_len;
/* Check if this is required */
task_ctx->ystorm_st_context.ox_id = io_req->xid;
task_ctx->ystorm_st_context.task_rety_identifier =
io_req->task_retry_identifier;
/* T Storm ag context */
SET_FIELD(task_ctx->tstorm_ag_context.flags0,
TSTORM_FCOE_TASK_AG_CTX_CONNECTION_TYPE, PROTOCOLID_FCOE);
task_ctx->tstorm_ag_context.icid = (u16)fcport->fw_cid;
/* T Storm st context */
SET_FIELD(task_ctx->tstorm_st_context.read_write.flags,
FCOE_TSTORM_FCOE_TASK_ST_CTX_READ_WRITE_EXP_FIRST_FRAME,
1);
task_ctx->tstorm_st_context.read_write.rx_id = 0xffff;
task_ctx->tstorm_st_context.read_only.dev_type =
FCOE_TASK_DEV_TYPE_DISK;
task_ctx->tstorm_st_context.read_only.conf_supported = 0;
task_ctx->tstorm_st_context.read_only.cid = fcport->fw_cid;
/* Completion queue for response. */
task_ctx->tstorm_st_context.read_only.glbl_q_num = cq_idx;
task_ctx->tstorm_st_context.read_only.fcp_cmd_trns_size =
io_req->data_xfer_len;
task_ctx->tstorm_st_context.read_write.e_d_tov_exp_timeout_val =
lport->e_d_tov;
task_ctx->ustorm_ag_context.global_cq_num = cq_idx;
io_req->fp_idx = cq_idx;
bd_count = bd_tbl->bd_valid;
if (task_type == FCOE_TASK_TYPE_WRITE_INITIATOR) {
/* Setup WRITE task */
struct fcoe_sge *fcoe_bd_tbl = bd_tbl->bd_tbl;
task_ctx->ystorm_st_context.task_type =
FCOE_TASK_TYPE_WRITE_INITIATOR;
data_desc = &task_ctx->ystorm_st_context.data_desc;
if (io_req->use_slowpath) {
SET_FIELD(task_ctx->ystorm_st_context.sgl_mode,
YSTORM_FCOE_TASK_ST_CTX_TX_SGL_MODE,
FCOE_SLOW_SGL);
data_desc->slow.base_sgl_addr.lo =
U64_LO(bd_tbl->bd_tbl_dma);
data_desc->slow.base_sgl_addr.hi =
U64_HI(bd_tbl->bd_tbl_dma);
data_desc->slow.remainder_num_sges = bd_count;
data_desc->slow.curr_sge_off = 0;
data_desc->slow.curr_sgl_index = 0;
qedf->slow_sge_ios++;
io_req->sge_type = QEDF_IOREQ_SLOW_SGE;
} else {
SET_FIELD(task_ctx->ystorm_st_context.sgl_mode,
YSTORM_FCOE_TASK_ST_CTX_TX_SGL_MODE,
(bd_count <= 4) ? (enum fcoe_sgl_mode)bd_count :
FCOE_MUL_FAST_SGES);
if (bd_count == 1) {
data_desc->single_sge.sge_addr.lo =
fcoe_bd_tbl->sge_addr.lo;
data_desc->single_sge.sge_addr.hi =
fcoe_bd_tbl->sge_addr.hi;
data_desc->single_sge.size =
fcoe_bd_tbl->size;
data_desc->single_sge.is_valid_sge = 0;
qedf->single_sge_ios++;
io_req->sge_type = QEDF_IOREQ_SINGLE_SGE;
} else {
data_desc->fast.sgl_start_addr.lo =
U64_LO(bd_tbl->bd_tbl_dma);
data_desc->fast.sgl_start_addr.hi =
U64_HI(bd_tbl->bd_tbl_dma);
data_desc->fast.sgl_byte_offset =
data_desc->fast.sgl_start_addr.lo &
(QEDF_PAGE_SIZE - 1);
if (data_desc->fast.sgl_byte_offset > 0)
QEDF_ERR(&(qedf->dbg_ctx),
"byte_offset=%u for xid=0x%x.\n",
io_req->xid,
data_desc->fast.sgl_byte_offset);
data_desc->fast.task_reuse_cnt =
io_req->reuse_count;
io_req->reuse_count++;
if (io_req->reuse_count == QEDF_MAX_REUSE) {
*ptu_invalidate = 1;
io_req->reuse_count = 0;
}
qedf->fast_sge_ios++;
io_req->sge_type = QEDF_IOREQ_FAST_SGE;
}
}
/* T Storm context */
task_ctx->tstorm_st_context.read_only.task_type =
FCOE_TASK_TYPE_WRITE_INITIATOR;
/* M Storm context */
tmp_sgl_mode = GET_FIELD(task_ctx->ystorm_st_context.sgl_mode,
YSTORM_FCOE_TASK_ST_CTX_TX_SGL_MODE);
SET_FIELD(task_ctx->mstorm_st_context.non_fp.tx_rx_sgl_mode,
FCOE_MSTORM_FCOE_TASK_ST_CTX_NON_FP_TX_SGL_MODE,
tmp_sgl_mode);
} else {
/* Setup READ task */
/* M Storm context */
struct fcoe_sge *fcoe_bd_tbl = bd_tbl->bd_tbl;
data_desc = &task_ctx->mstorm_st_context.fp.data_desc;
task_ctx->mstorm_st_context.fp.data_2_trns_rem =
io_req->data_xfer_len;
if (io_req->use_slowpath) {
SET_FIELD(
task_ctx->mstorm_st_context.non_fp.tx_rx_sgl_mode,
FCOE_MSTORM_FCOE_TASK_ST_CTX_NON_FP_RX_SGL_MODE,
FCOE_SLOW_SGL);
data_desc->slow.base_sgl_addr.lo =
U64_LO(bd_tbl->bd_tbl_dma);
data_desc->slow.base_sgl_addr.hi =
U64_HI(bd_tbl->bd_tbl_dma);
data_desc->slow.remainder_num_sges =
bd_count;
data_desc->slow.curr_sge_off = 0;
data_desc->slow.curr_sgl_index = 0;
qedf->slow_sge_ios++;
io_req->sge_type = QEDF_IOREQ_SLOW_SGE;
} else {
SET_FIELD(
task_ctx->mstorm_st_context.non_fp.tx_rx_sgl_mode,
FCOE_MSTORM_FCOE_TASK_ST_CTX_NON_FP_RX_SGL_MODE,
(bd_count <= 4) ? (enum fcoe_sgl_mode)bd_count :
FCOE_MUL_FAST_SGES);
if (bd_count == 1) {
data_desc->single_sge.sge_addr.lo =
fcoe_bd_tbl->sge_addr.lo;
data_desc->single_sge.sge_addr.hi =
fcoe_bd_tbl->sge_addr.hi;
data_desc->single_sge.size =
fcoe_bd_tbl->size;
data_desc->single_sge.is_valid_sge = 0;
qedf->single_sge_ios++;
io_req->sge_type = QEDF_IOREQ_SINGLE_SGE;
} else {
data_desc->fast.sgl_start_addr.lo =
U64_LO(bd_tbl->bd_tbl_dma);
data_desc->fast.sgl_start_addr.hi =
U64_HI(bd_tbl->bd_tbl_dma);
data_desc->fast.sgl_byte_offset = 0;
data_desc->fast.task_reuse_cnt =
io_req->reuse_count;
io_req->reuse_count++;
if (io_req->reuse_count == QEDF_MAX_REUSE) {
*ptu_invalidate = 1;
io_req->reuse_count = 0;
}
qedf->fast_sge_ios++;
io_req->sge_type = QEDF_IOREQ_FAST_SGE;
}
}
/* Y Storm context */
task_ctx->ystorm_st_context.expect_first_xfer = 0;
task_ctx->ystorm_st_context.task_type =
FCOE_TASK_TYPE_READ_INITIATOR;
/* T Storm context */
task_ctx->tstorm_st_context.read_only.task_type =
FCOE_TASK_TYPE_READ_INITIATOR;
mst_sgl_mode = GET_FIELD(
task_ctx->mstorm_st_context.non_fp.tx_rx_sgl_mode,
FCOE_MSTORM_FCOE_TASK_ST_CTX_NON_FP_RX_SGL_MODE);
SET_FIELD(task_ctx->tstorm_st_context.read_write.flags,
FCOE_TSTORM_FCOE_TASK_ST_CTX_READ_WRITE_RX_SGL_MODE,
mst_sgl_mode);
}
/* fill FCP_CMND IU */
fcp_cmnd = (u32 *)task_ctx->ystorm_st_context.tx_info_union.fcp_cmd_payload.opaque;
qedf_build_fcp_cmnd(io_req, (struct fcp_cmnd *)&tmp_fcp_cmnd);
/* Swap fcp_cmnd since FC is big endian */
cnt = sizeof(struct fcp_cmnd) / sizeof(u32);
for (i = 0; i < cnt; i++) {
*fcp_cmnd = cpu_to_be32(tmp_fcp_cmnd[i]);
fcp_cmnd++;
}
/* M Storm context - Sense buffer */
task_ctx->mstorm_st_context.non_fp.rsp_buf_addr.lo =
U64_LO(io_req->sense_buffer_dma);
task_ctx->mstorm_st_context.non_fp.rsp_buf_addr.hi =
U64_HI(io_req->sense_buffer_dma);
}
void qedf_init_mp_task(struct qedf_ioreq *io_req,
struct fcoe_task_context *task_ctx)
{
struct qedf_mp_req *mp_req = &(io_req->mp_req);
struct qedf_rport *fcport = io_req->fcport;
struct qedf_ctx *qedf = io_req->fcport->qedf;
struct fc_frame_header *fc_hdr;
enum fcoe_task_type task_type = 0;
union fcoe_data_desc_ctx *data_desc;
QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_DISC, "Initializing MP task "
"for cmd_type = %d\n", io_req->cmd_type);
qedf->control_requests++;
/* Obtain task_type */
if ((io_req->cmd_type == QEDF_TASK_MGMT_CMD) ||
(io_req->cmd_type == QEDF_ELS)) {
task_type = FCOE_TASK_TYPE_MIDPATH;
} else if (io_req->cmd_type == QEDF_ABTS) {
task_type = FCOE_TASK_TYPE_ABTS;
}
memset(task_ctx, 0, sizeof(struct fcoe_task_context));
/* Setup the task from io_req for easy reference */
io_req->task = task_ctx;
QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_DISC, "task type = %d\n",
task_type);
/* YSTORM only */
{
/* Initialize YSTORM task context */
struct fcoe_tx_mid_path_params *task_fc_hdr =
&task_ctx->ystorm_st_context.tx_info_union.tx_params.mid_path;
memset(task_fc_hdr, 0, sizeof(struct fcoe_tx_mid_path_params));
task_ctx->ystorm_st_context.task_rety_identifier =
io_req->task_retry_identifier;
/* Init SGL parameters */
if ((task_type == FCOE_TASK_TYPE_MIDPATH) ||
(task_type == FCOE_TASK_TYPE_UNSOLICITED)) {
data_desc = &task_ctx->ystorm_st_context.data_desc;
data_desc->slow.base_sgl_addr.lo =
U64_LO(mp_req->mp_req_bd_dma);
data_desc->slow.base_sgl_addr.hi =
U64_HI(mp_req->mp_req_bd_dma);
data_desc->slow.remainder_num_sges = 1;
data_desc->slow.curr_sge_off = 0;
data_desc->slow.curr_sgl_index = 0;
}
fc_hdr = &(mp_req->req_fc_hdr);
if (task_type == FCOE_TASK_TYPE_MIDPATH) {
fc_hdr->fh_ox_id = io_req->xid;
fc_hdr->fh_rx_id = htons(0xffff);
} else if (task_type == FCOE_TASK_TYPE_UNSOLICITED) {
fc_hdr->fh_rx_id = io_req->xid;
}
/* Fill FC Header into middle path buffer */
task_fc_hdr->parameter = fc_hdr->fh_parm_offset;
task_fc_hdr->r_ctl = fc_hdr->fh_r_ctl;
task_fc_hdr->type = fc_hdr->fh_type;
task_fc_hdr->cs_ctl = fc_hdr->fh_cs_ctl;
task_fc_hdr->df_ctl = fc_hdr->fh_df_ctl;
task_fc_hdr->rx_id = fc_hdr->fh_rx_id;
task_fc_hdr->ox_id = fc_hdr->fh_ox_id;
task_ctx->ystorm_st_context.data_2_trns_rem =
io_req->data_xfer_len;
task_ctx->ystorm_st_context.task_type = task_type;
}
/* TSTORM ONLY */
{
task_ctx->tstorm_ag_context.icid = (u16)fcport->fw_cid;
task_ctx->tstorm_st_context.read_only.cid = fcport->fw_cid;
/* Always send middle-path repsonses on CQ #0 */
task_ctx->tstorm_st_context.read_only.glbl_q_num = 0;
io_req->fp_idx = 0;
SET_FIELD(task_ctx->tstorm_ag_context.flags0,
TSTORM_FCOE_TASK_AG_CTX_CONNECTION_TYPE,
PROTOCOLID_FCOE);
task_ctx->tstorm_st_context.read_only.task_type = task_type;
SET_FIELD(task_ctx->tstorm_st_context.read_write.flags,
FCOE_TSTORM_FCOE_TASK_ST_CTX_READ_WRITE_EXP_FIRST_FRAME,
1);
task_ctx->tstorm_st_context.read_write.rx_id = 0xffff;
}
/* MSTORM only */
{
if (task_type == FCOE_TASK_TYPE_MIDPATH) {
/* Initialize task context */
data_desc = &task_ctx->mstorm_st_context.fp.data_desc;
/* Set cache sges address and length */
data_desc->slow.base_sgl_addr.lo =
U64_LO(mp_req->mp_resp_bd_dma);
data_desc->slow.base_sgl_addr.hi =
U64_HI(mp_req->mp_resp_bd_dma);
data_desc->slow.remainder_num_sges = 1;
data_desc->slow.curr_sge_off = 0;
data_desc->slow.curr_sgl_index = 0;
/*
* Also need to fil in non-fastpath response address
* for middle path commands.
*/
task_ctx->mstorm_st_context.non_fp.rsp_buf_addr.lo =
U64_LO(mp_req->mp_resp_bd_dma);
task_ctx->mstorm_st_context.non_fp.rsp_buf_addr.hi =
U64_HI(mp_req->mp_resp_bd_dma);
}
}
/* USTORM ONLY */
{
task_ctx->ustorm_ag_context.global_cq_num = 0;
}
/* I/O stats. Middle path commands always use slow SGEs */
qedf->slow_sge_ios++;
io_req->sge_type = QEDF_IOREQ_SLOW_SGE;
}
void qedf_add_to_sq(struct qedf_rport *fcport, u16 xid, u32 ptu_invalidate,
enum fcoe_task_type req_type, u32 offset)
{
struct fcoe_wqe *sqe;
uint16_t total_sqe = (fcport->sq_mem_size)/(sizeof(struct fcoe_wqe));
sqe = &fcport->sq[fcport->sq_prod_idx];
fcport->sq_prod_idx++;
fcport->fw_sq_prod_idx++;
if (fcport->sq_prod_idx == total_sqe)
fcport->sq_prod_idx = 0;
switch (req_type) {
case FCOE_TASK_TYPE_WRITE_INITIATOR:
case FCOE_TASK_TYPE_READ_INITIATOR:
SET_FIELD(sqe->flags, FCOE_WQE_REQ_TYPE, SEND_FCOE_CMD);
if (ptu_invalidate)
SET_FIELD(sqe->flags, FCOE_WQE_INVALIDATE_PTU, 1);
break;
case FCOE_TASK_TYPE_MIDPATH:
SET_FIELD(sqe->flags, FCOE_WQE_REQ_TYPE, SEND_FCOE_MIDPATH);
break;
case FCOE_TASK_TYPE_ABTS:
SET_FIELD(sqe->flags, FCOE_WQE_REQ_TYPE,
SEND_FCOE_ABTS_REQUEST);
break;
case FCOE_TASK_TYPE_EXCHANGE_CLEANUP:
SET_FIELD(sqe->flags, FCOE_WQE_REQ_TYPE,
FCOE_EXCHANGE_CLEANUP);
break;
case FCOE_TASK_TYPE_SEQUENCE_CLEANUP:
SET_FIELD(sqe->flags, FCOE_WQE_REQ_TYPE,
FCOE_SEQUENCE_RECOVERY);
/* NOTE: offset param only used for sequence recovery */
sqe->additional_info_union.seq_rec_updated_offset = offset;
break;
case FCOE_TASK_TYPE_UNSOLICITED:
break;
default:
break;
}
sqe->task_id = xid;
/* Make sure SQ data is coherent */
wmb();
}
void qedf_ring_doorbell(struct qedf_rport *fcport)
{
struct fcoe_db_data dbell = { 0 };
dbell.agg_flags = 0;
dbell.params |= DB_DEST_XCM << FCOE_DB_DATA_DEST_SHIFT;
dbell.params |= DB_AGG_CMD_SET << FCOE_DB_DATA_AGG_CMD_SHIFT;
dbell.params |= DQ_XCM_FCOE_SQ_PROD_CMD <<
FCOE_DB_DATA_AGG_VAL_SEL_SHIFT;
dbell.sq_prod = fcport->fw_sq_prod_idx;
writel(*(u32 *)&dbell, fcport->p_doorbell);
/* Make sure SQ index is updated so f/w prcesses requests in order */
wmb();
mmiowb();
}
static void qedf_trace_io(struct qedf_rport *fcport, struct qedf_ioreq *io_req,
int8_t direction)
{
struct qedf_ctx *qedf = fcport->qedf;
struct qedf_io_log *io_log;
struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
unsigned long flags;
uint8_t op;
spin_lock_irqsave(&qedf->io_trace_lock, flags);
io_log = &qedf->io_trace_buf[qedf->io_trace_idx];
io_log->direction = direction;
io_log->task_id = io_req->xid;
io_log->port_id = fcport->rdata->ids.port_id;
io_log->lun = sc_cmd->device->lun;
io_log->op = op = sc_cmd->cmnd[0];
io_log->lba[0] = sc_cmd->cmnd[2];
io_log->lba[1] = sc_cmd->cmnd[3];
io_log->lba[2] = sc_cmd->cmnd[4];
io_log->lba[3] = sc_cmd->cmnd[5];
io_log->bufflen = scsi_bufflen(sc_cmd);
io_log->sg_count = scsi_sg_count(sc_cmd);
io_log->result = sc_cmd->result;
io_log->jiffies = jiffies;
io_log->refcount = kref_read(&io_req->refcount);
if (direction == QEDF_IO_TRACE_REQ) {
/* For requests we only care abot the submission CPU */
io_log->req_cpu = io_req->cpu;
io_log->int_cpu = 0;
io_log->rsp_cpu = 0;
} else if (direction == QEDF_IO_TRACE_RSP) {
io_log->req_cpu = io_req->cpu;
io_log->int_cpu = io_req->int_cpu;
io_log->rsp_cpu = smp_processor_id();
}
io_log->sge_type = io_req->sge_type;
qedf->io_trace_idx++;
if (qedf->io_trace_idx == QEDF_IO_TRACE_SIZE)
qedf->io_trace_idx = 0;
spin_unlock_irqrestore(&qedf->io_trace_lock, flags);
}
int qedf_post_io_req(struct qedf_rport *fcport, struct qedf_ioreq *io_req)
{
struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
struct Scsi_Host *host = sc_cmd->device->host;
struct fc_lport *lport = shost_priv(host);
struct qedf_ctx *qedf = lport_priv(lport);
struct fcoe_task_context *task_ctx;
u16 xid;
enum fcoe_task_type req_type = 0;
u32 ptu_invalidate = 0;
/* Initialize rest of io_req fileds */
io_req->data_xfer_len = scsi_bufflen(sc_cmd);
sc_cmd->SCp.ptr = (char *)io_req;
io_req->use_slowpath = false; /* Assume fast SGL by default */
/* Record which cpu this request is associated with */
io_req->cpu = smp_processor_id();
if (sc_cmd->sc_data_direction == DMA_FROM_DEVICE) {
req_type = FCOE_TASK_TYPE_READ_INITIATOR;
io_req->io_req_flags = QEDF_READ;
qedf->input_requests++;
} else if (sc_cmd->sc_data_direction == DMA_TO_DEVICE) {
req_type = FCOE_TASK_TYPE_WRITE_INITIATOR;
io_req->io_req_flags = QEDF_WRITE;
qedf->output_requests++;
} else {
io_req->io_req_flags = 0;
qedf->control_requests++;
}
xid = io_req->xid;
/* Build buffer descriptor list for firmware from sg list */
if (qedf_build_bd_list_from_sg(io_req)) {
QEDF_ERR(&(qedf->dbg_ctx), "BD list creation failed.\n");
kref_put(&io_req->refcount, qedf_release_cmd);
return -EAGAIN;
}
/* Get the task context */
task_ctx = qedf_get_task_mem(&qedf->tasks, xid);
if (!task_ctx) {
QEDF_WARN(&(qedf->dbg_ctx), "task_ctx is NULL, xid=%d.\n",
xid);
kref_put(&io_req->refcount, qedf_release_cmd);
return -EINVAL;
}
qedf_init_task(fcport, lport, io_req, &ptu_invalidate, task_ctx);
if (!test_bit(QEDF_RPORT_SESSION_READY, &fcport->flags)) {
QEDF_ERR(&(qedf->dbg_ctx), "Session not offloaded yet.\n");
kref_put(&io_req->refcount, qedf_release_cmd);
}
/* Obtain free SQ entry */
qedf_add_to_sq(fcport, xid, ptu_invalidate, req_type, 0);
/* Ring doorbell */
qedf_ring_doorbell(fcport);
if (qedf_io_tracing && io_req->sc_cmd)
qedf_trace_io(fcport, io_req, QEDF_IO_TRACE_REQ);
return false;
}
int
qedf_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc_cmd)
{
struct fc_lport *lport = shost_priv(host);
struct qedf_ctx *qedf = lport_priv(lport);
struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
struct fc_rport_libfc_priv *rp = rport->dd_data;
struct qedf_rport *fcport = rport->dd_data;
struct qedf_ioreq *io_req;
int rc = 0;
int rval;
unsigned long flags = 0;
if (test_bit(QEDF_UNLOADING, &qedf->flags) ||
test_bit(QEDF_DBG_STOP_IO, &qedf->flags)) {
sc_cmd->result = DID_NO_CONNECT << 16;
sc_cmd->scsi_done(sc_cmd);
return 0;
}
rval = fc_remote_port_chkready(rport);
if (rval) {
sc_cmd->result = rval;
sc_cmd->scsi_done(sc_cmd);
return 0;
}
/* Retry command if we are doing a qed drain operation */
if (test_bit(QEDF_DRAIN_ACTIVE, &qedf->flags)) {
rc = SCSI_MLQUEUE_HOST_BUSY;
goto exit_qcmd;
}
if (lport->state != LPORT_ST_READY ||
atomic_read(&qedf->link_state) != QEDF_LINK_UP) {
rc = SCSI_MLQUEUE_HOST_BUSY;
goto exit_qcmd;
}
/* rport and tgt are allocated together, so tgt should be non-NULL */
fcport = (struct qedf_rport *)&rp[1];
if (!test_bit(QEDF_RPORT_SESSION_READY, &fcport->flags)) {
/*
* Session is not offloaded yet. Let SCSI-ml retry
* the command.
*/
rc = SCSI_MLQUEUE_TARGET_BUSY;
goto exit_qcmd;
}
if (fcport->retry_delay_timestamp) {
if (time_after(jiffies, fcport->retry_delay_timestamp)) {
fcport->retry_delay_timestamp = 0;
} else {
/* If retry_delay timer is active, flow off the ML */
rc = SCSI_MLQUEUE_TARGET_BUSY;
goto exit_qcmd;
}
}
io_req = qedf_alloc_cmd(fcport, QEDF_SCSI_CMD);
if (!io_req) {
rc = SCSI_MLQUEUE_HOST_BUSY;
goto exit_qcmd;
}
io_req->sc_cmd = sc_cmd;
/* Take fcport->rport_lock for posting to fcport send queue */
spin_lock_irqsave(&fcport->rport_lock, flags);
if (qedf_post_io_req(fcport, io_req)) {
QEDF_WARN(&(qedf->dbg_ctx), "Unable to post io_req\n");
/* Return SQE to pool */
atomic_inc(&fcport->free_sqes);
rc = SCSI_MLQUEUE_HOST_BUSY;
}
spin_unlock_irqrestore(&fcport->rport_lock, flags);
exit_qcmd:
return rc;
}
static void qedf_parse_fcp_rsp(struct qedf_ioreq *io_req,
struct fcoe_cqe_rsp_info *fcp_rsp)
{
struct scsi_cmnd *sc_cmd = io_req->sc_cmd;
struct qedf_ctx *qedf = io_req->fcport->qedf;
u8 rsp_flags = fcp_rsp->rsp_flags.flags;
int fcp_sns_len = 0;
int fcp_rsp_len = 0;
uint8_t *rsp_info, *sense_data;
io_req->fcp_status = FC_GOOD;
io_req->fcp_resid = 0;
if (rsp_flags & (FCOE_FCP_RSP_FLAGS_FCP_RESID_OVER |
FCOE_FCP_RSP_FLAGS_FCP_RESID_UNDER))
io_req->fcp_resid = fcp_rsp->fcp_resid;
io_req->scsi_comp_flags = rsp_flags;
CMD_SCSI_STATUS(sc_cmd) = io_req->cdb_status =
fcp_rsp->scsi_status_code;
if (rsp_flags &
FCOE_FCP_RSP_FLAGS_FCP_RSP_LEN_VALID)
fcp_rsp_len = fcp_rsp->fcp_rsp_len;
if (rsp_flags &
FCOE_FCP_RSP_FLAGS_FCP_SNS_LEN_VALID)
fcp_sns_len = fcp_rsp->fcp_sns_len;
io_req->fcp_rsp_len = fcp_rsp_len;
io_req->fcp_sns_len = fcp_sns_len;
rsp_info = sense_data = io_req->sense_buffer;
/* fetch fcp_rsp_code */
if ((fcp_rsp_len == 4) || (fcp_rsp_len == 8)) {
/* Only for task management function */
io_req->fcp_rsp_code = rsp_info[3];
QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO,
"fcp_rsp_code = %d\n", io_req->fcp_rsp_code);
/* Adjust sense-data location. */
sense_data += fcp_rsp_len;
}
if (fcp_sns_len > SCSI_SENSE_BUFFERSIZE) {
QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO,
"Truncating sense buffer\n");
fcp_sns_len = SCSI_SENSE_BUFFERSIZE;
}
memset(sc_cmd->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
if (fcp_sns_len)
memcpy(sc_cmd->sense_buffer, sense_data,
fcp_sns_len);
}
static void qedf_unmap_sg_list(struct qedf_ctx *qedf, struct qedf_ioreq *io_req)
{
struct scsi_cmnd *sc = io_req->sc_cmd;
if (io_req->bd_tbl->bd_valid && sc && scsi_sg_count(sc)) {
dma_unmap_sg(&qedf->pdev->dev, scsi_sglist(sc),
scsi_sg_count(sc), sc->sc_data_direction);
io_req->bd_tbl->bd_valid = 0;
}
}
void qedf_scsi_completion(struct qedf_ctx *qedf, struct fcoe_cqe *cqe,
struct qedf_ioreq *io_req)
{
u16 xid, rval;
struct fcoe_task_context *task_ctx;
struct scsi_cmnd *sc_cmd;
struct fcoe_cqe_rsp_info *fcp_rsp;
struct qedf_rport *fcport;
int refcount;
u16 scope, qualifier = 0;
u8 fw_residual_flag = 0;
if (!io_req)
return;
if (!cqe)
return;
xid = io_req->xid;
task_ctx = qedf_get_task_mem(&qedf->tasks, xid);
sc_cmd = io_req->sc_cmd;
fcp_rsp = &cqe->cqe_info.rsp_info;
if (!sc_cmd) {
QEDF_WARN(&(qedf->dbg_ctx), "sc_cmd is NULL!\n");
return;
}
if (!sc_cmd->SCp.ptr) {
QEDF_WARN(&(qedf->dbg_ctx), "SCp.ptr is NULL, returned in "
"another context.\n");
return;
}
if (!sc_cmd->request) {
QEDF_WARN(&(qedf->dbg_ctx), "sc_cmd->request is NULL, "
"sc_cmd=%p.\n", sc_cmd);
return;
}
if (!sc_cmd->request->special) {
QEDF_WARN(&(qedf->dbg_ctx), "request->special is NULL so "
"request not valid, sc_cmd=%p.\n", sc_cmd);
return;
}
if (!sc_cmd->request->q) {
QEDF_WARN(&(qedf->dbg_ctx), "request->q is NULL so request "
"is not valid, sc_cmd=%p.\n", sc_cmd);
return;
}
fcport = io_req->fcport;
qedf_parse_fcp_rsp(io_req, fcp_rsp);
qedf_unmap_sg_list(qedf, io_req);
/* Check for FCP transport error */
if (io_req->fcp_rsp_len > 3 && io_req->fcp_rsp_code) {
QEDF_ERR(&(qedf->dbg_ctx),
"FCP I/O protocol failure xid=0x%x fcp_rsp_len=%d "
"fcp_rsp_code=%d.\n", io_req->xid, io_req->fcp_rsp_len,
io_req->fcp_rsp_code);
sc_cmd->result = DID_BUS_BUSY << 16;
goto out;
}
fw_residual_flag = GET_FIELD(cqe->cqe_info.rsp_info.fw_error_flags,
FCOE_CQE_RSP_INFO_FW_UNDERRUN);
if (fw_residual_flag) {
QEDF_ERR(&(qedf->dbg_ctx),
"Firmware detected underrun: xid=0x%x fcp_rsp.flags=0x%02x "
"fcp_resid=%d fw_residual=0x%x.\n", io_req->xid,
fcp_rsp->rsp_flags.flags, io_req->fcp_resid,
cqe->cqe_info.rsp_info.fw_residual);
if (io_req->cdb_status == 0)
sc_cmd->result = (DID_ERROR << 16) | io_req->cdb_status;
else
sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
/* Abort the command since we did not get all the data */
init_completion(&io_req->abts_done);
rval = qedf_initiate_abts(io_req, true);
if (rval) {
QEDF_ERR(&(qedf->dbg_ctx), "Failed to queue ABTS.\n");
sc_cmd->result = (DID_ERROR << 16) | io_req->cdb_status;
}
/*
* Set resid to the whole buffer length so we won't try to resue
* any previously data.
*/
scsi_set_resid(sc_cmd, scsi_bufflen(sc_cmd));
goto out;
}
switch (io_req->fcp_status) {
case FC_GOOD:
if (io_req->cdb_status == 0) {
/* Good I/O completion */
sc_cmd->result = DID_OK << 16;
} else {
refcount = kref_read(&io_req->refcount);
QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO,
"%d:0:%d:%d xid=0x%0x op=0x%02x "
"lba=%02x%02x%02x%02x cdb_status=%d "
"fcp_resid=0x%x refcount=%d.\n",
qedf->lport->host->host_no, sc_cmd->device->id,
sc_cmd->device->lun, io_req->xid,
sc_cmd->cmnd[0], sc_cmd->cmnd[2], sc_cmd->cmnd[3],
sc_cmd->cmnd[4], sc_cmd->cmnd[5],
io_req->cdb_status, io_req->fcp_resid,
refcount);
sc_cmd->result = (DID_OK << 16) | io_req->cdb_status;
if (io_req->cdb_status == SAM_STAT_TASK_SET_FULL ||
io_req->cdb_status == SAM_STAT_BUSY) {
/*
* Check whether we need to set retry_delay at
* all based on retry_delay module parameter
* and the status qualifier.
*/
/* Upper 2 bits */
scope = fcp_rsp->retry_delay_timer & 0xC000;
/* Lower 14 bits */
qualifier = fcp_rsp->retry_delay_timer & 0x3FFF;
if (qedf_retry_delay &&
scope > 0 && qualifier > 0 &&
qualifier <= 0x3FEF) {
/* Check we don't go over the max */
if (qualifier > QEDF_RETRY_DELAY_MAX)
qualifier =
QEDF_RETRY_DELAY_MAX;
fcport->retry_delay_timestamp =
jiffies + (qualifier * HZ / 10);
}
}
}
if (io_req->fcp_resid)
scsi_set_resid(sc_cmd, io_req->fcp_resid);
break;
default:
QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO, "fcp_status=%d.\n",
io_req->fcp_status);
break;
}
out:
if (qedf_io_tracing)
qedf_trace_io(fcport, io_req, QEDF_IO_TRACE_RSP);
io_req->sc_cmd = NULL;
sc_cmd->SCp.ptr = NULL;
sc_cmd->scsi_done(sc_cmd);
kref_put(&io_req->refcount, qedf_release_cmd);
}
/* Return a SCSI command in some other context besides a normal completion */
void qedf_scsi_done(struct qedf_ctx *qedf, struct qedf_ioreq *io_req,
int result)
{
u16 xid;
struct scsi_cmnd *sc_cmd;
int refcount;
if (!io_req)
return;
xid = io_req->xid;
sc_cmd = io_req->sc_cmd;
if (!sc_cmd) {
QEDF_WARN(&(qedf->dbg_ctx), "sc_cmd is NULL!\n");
return;
}
if (!sc_cmd->SCp.ptr) {
QEDF_WARN(&(qedf->dbg_ctx), "SCp.ptr is NULL, returned in "
"another context.\n");
return;
}
qedf_unmap_sg_list(qedf, io_req);
sc_cmd->result = result << 16;
refcount = kref_read(&io_req->refcount);
QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO, "%d:0:%d:%d: Completing "
"sc_cmd=%p result=0x%08x op=0x%02x lba=0x%02x%02x%02x%02x, "
"allowed=%d retries=%d refcount=%d.\n",
qedf->lport->host->host_no, sc_cmd->device->id,
sc_cmd->device->lun, sc_cmd, sc_cmd->result, sc_cmd->cmnd[0],
sc_cmd->cmnd[2], sc_cmd->cmnd[3], sc_cmd->cmnd[4],
sc_cmd->cmnd[5], sc_cmd->allowed, sc_cmd->retries,
refcount);
/*
* Set resid to the whole buffer length so we won't try to resue any
* previously read data
*/
scsi_set_resid(sc_cmd, scsi_bufflen(sc_cmd));
if (qedf_io_tracing)
qedf_trace_io(io_req->fcport, io_req, QEDF_IO_TRACE_RSP);
io_req->sc_cmd = NULL;
sc_cmd->SCp.ptr = NULL;
sc_cmd->scsi_done(sc_cmd);
kref_put(&io_req->refcount, qedf_release_cmd);
}
/*
* Handle warning type CQE completions. This is mainly used for REC timer
* popping.
*/
void qedf_process_warning_compl(struct qedf_ctx *qedf, struct fcoe_cqe *cqe,
struct qedf_ioreq *io_req)
{
int rval, i;
struct qedf_rport *fcport = io_req->fcport;
u64 err_warn_bit_map;
u8 err_warn = 0xff;
if (!cqe)
return;
QEDF_ERR(&(io_req->fcport->qedf->dbg_ctx), "Warning CQE, "
"xid=0x%x\n", io_req->xid);
QEDF_ERR(&(io_req->fcport->qedf->dbg_ctx),
"err_warn_bitmap=%08x:%08x\n",
le32_to_cpu(cqe->cqe_info.err_info.err_warn_bitmap_hi),
le32_to_cpu(cqe->cqe_info.err_info.err_warn_bitmap_lo));
QEDF_ERR(&(io_req->fcport->qedf->dbg_ctx), "tx_buff_off=%08x, "
"rx_buff_off=%08x, rx_id=%04x\n",
le32_to_cpu(cqe->cqe_info.err_info.tx_buf_off),
le32_to_cpu(cqe->cqe_info.err_info.rx_buf_off),
le32_to_cpu(cqe->cqe_info.err_info.rx_id));
/* Normalize the error bitmap value to an just an unsigned int */
err_warn_bit_map = (u64)
((u64)cqe->cqe_info.err_info.err_warn_bitmap_hi << 32) |
(u64)cqe->cqe_info.err_info.err_warn_bitmap_lo;
for (i = 0; i < 64; i++) {
if (err_warn_bit_map & (u64)((u64)1 << i)) {
err_warn = i;
break;
}
}
/* Check if REC TOV expired if this is a tape device */
if (fcport->dev_type == QEDF_RPORT_TYPE_TAPE) {
if (err_warn ==
FCOE_WARNING_CODE_REC_TOV_TIMER_EXPIRATION) {
QEDF_ERR(&(qedf->dbg_ctx), "REC timer expired.\n");
if (!test_bit(QEDF_CMD_SRR_SENT, &io_req->flags)) {
io_req->rx_buf_off =
cqe->cqe_info.err_info.rx_buf_off;
io_req->tx_buf_off =
cqe->cqe_info.err_info.tx_buf_off;
io_req->rx_id = cqe->cqe_info.err_info.rx_id;
rval = qedf_send_rec(io_req);
/*
* We only want to abort the io_req if we
* can't queue the REC command as we want to
* keep the exchange open for recovery.
*/
if (rval)
goto send_abort;
}
return;
}
}
send_abort:
init_completion(&io_req->abts_done);
rval = qedf_initiate_abts(io_req, true);
if (rval)
QEDF_ERR(&(qedf->dbg_ctx), "Failed to queue ABTS.\n");
}
/* Cleanup a command when we receive an error detection completion */
void qedf_process_error_detect(struct qedf_ctx *qedf, struct fcoe_cqe *cqe,
struct qedf_ioreq *io_req)
{
int rval;
if (!cqe)
return;
QEDF_ERR(&(io_req->fcport->qedf->dbg_ctx), "Error detection CQE, "
"xid=0x%x\n", io_req->xid);
QEDF_ERR(&(io_req->fcport->qedf->dbg_ctx),
"err_warn_bitmap=%08x:%08x\n",
le32_to_cpu(cqe->cqe_info.err_info.err_warn_bitmap_hi),
le32_to_cpu(cqe->cqe_info.err_info.err_warn_bitmap_lo));
QEDF_ERR(&(io_req->fcport->qedf->dbg_ctx), "tx_buff_off=%08x, "
"rx_buff_off=%08x, rx_id=%04x\n",
le32_to_cpu(cqe->cqe_info.err_info.tx_buf_off),
le32_to_cpu(cqe->cqe_info.err_info.rx_buf_off),
le32_to_cpu(cqe->cqe_info.err_info.rx_id));
if (qedf->stop_io_on_error) {
qedf_stop_all_io(qedf);
return;
}
init_completion(&io_req->abts_done);
rval = qedf_initiate_abts(io_req, true);
if (rval)
QEDF_ERR(&(qedf->dbg_ctx), "Failed to queue ABTS.\n");
}
static void qedf_flush_els_req(struct qedf_ctx *qedf,
struct qedf_ioreq *els_req)
{
QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO,
"Flushing ELS request xid=0x%x refcount=%d.\n", els_req->xid,
kref_read(&els_req->refcount));
/*
* Need to distinguish this from a timeout when calling the
* els_req->cb_func.
*/
els_req->event = QEDF_IOREQ_EV_ELS_FLUSH;
/* Cancel the timer */
cancel_delayed_work_sync(&els_req->timeout_work);
/* Call callback function to complete command */
if (els_req->cb_func && els_req->cb_arg) {
els_req->cb_func(els_req->cb_arg);
els_req->cb_arg = NULL;
}
/* Release kref for original initiate_els */
kref_put(&els_req->refcount, qedf_release_cmd);
}
/* A value of -1 for lun is a wild card that means flush all
* active SCSI I/Os for the target.
*/
void qedf_flush_active_ios(struct qedf_rport *fcport, int lun)
{
struct qedf_ioreq *io_req;
struct qedf_ctx *qedf;
struct qedf_cmd_mgr *cmd_mgr;
int i, rc;
if (!fcport)
return;
qedf = fcport->qedf;
cmd_mgr = qedf->cmd_mgr;
QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO, "Flush active i/o's.\n");
for (i = 0; i < FCOE_PARAMS_NUM_TASKS; i++) {
io_req = &cmd_mgr->cmds[i];
if (!io_req)
continue;
if (io_req->fcport != fcport)
continue;
if (io_req->cmd_type == QEDF_ELS) {
rc = kref_get_unless_zero(&io_req->refcount);
if (!rc) {
QEDF_ERR(&(qedf->dbg_ctx),
"Could not get kref for io_req=0x%p.\n",
io_req);
continue;
}
qedf_flush_els_req(qedf, io_req);
/*
* Release the kref and go back to the top of the
* loop.
*/
goto free_cmd;
}
if (!io_req->sc_cmd)
continue;
if (lun > 0) {
if (io_req->sc_cmd->device->lun !=
(u64)lun)
continue;
}
/*
* Use kref_get_unless_zero in the unlikely case the command
* we're about to flush was completed in the normal SCSI path
*/
rc = kref_get_unless_zero(&io_req->refcount);
if (!rc) {
QEDF_ERR(&(qedf->dbg_ctx), "Could not get kref for "
"io_req=0x%p\n", io_req);
continue;
}
QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO,
"Cleanup xid=0x%x.\n", io_req->xid);
/* Cleanup task and return I/O mid-layer */
qedf_initiate_cleanup(io_req, true);
free_cmd:
kref_put(&io_req->refcount, qedf_release_cmd);
}
}
/*
* Initiate a ABTS middle path command. Note that we don't have to initialize
* the task context for an ABTS task.
*/
int qedf_initiate_abts(struct qedf_ioreq *io_req, bool return_scsi_cmd_on_abts)
{
struct fc_lport *lport;
struct qedf_rport *fcport = io_req->fcport;
struct fc_rport_priv *rdata = fcport->rdata;
struct qedf_ctx *qedf = fcport->qedf;
u16 xid;
u32 r_a_tov = 0;
int rc = 0;
unsigned long flags;
r_a_tov = rdata->r_a_tov;
lport = qedf->lport;
if (!test_bit(QEDF_RPORT_SESSION_READY, &fcport->flags)) {
QEDF_ERR(&(qedf->dbg_ctx), "tgt not offloaded\n");
rc = 1;
goto abts_err;
}
if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
QEDF_ERR(&(qedf->dbg_ctx), "link is not ready\n");
rc = 1;
goto abts_err;
}
if (atomic_read(&qedf->link_down_tmo_valid) > 0) {
QEDF_ERR(&(qedf->dbg_ctx), "link_down_tmo active.\n");
rc = 1;
goto abts_err;
}
/* Ensure room on SQ */
if (!atomic_read(&fcport->free_sqes)) {
QEDF_ERR(&(qedf->dbg_ctx), "No SQ entries available\n");
rc = 1;
goto abts_err;
}
kref_get(&io_req->refcount);
xid = io_req->xid;
qedf->control_requests++;
qedf->packet_aborts++;
/* Set the return CPU to be the same as the request one */
io_req->cpu = smp_processor_id();
/* Set the command type to abort */
io_req->cmd_type = QEDF_ABTS;
io_req->return_scsi_cmd_on_abts = return_scsi_cmd_on_abts;
set_bit(QEDF_CMD_IN_ABORT, &io_req->flags);
QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_SCSI_TM, "ABTS io_req xid = "
"0x%x\n", xid);
qedf_cmd_timer_set(qedf, io_req, QEDF_ABORT_TIMEOUT * HZ);
spin_lock_irqsave(&fcport->rport_lock, flags);
/* Add ABTS to send queue */
qedf_add_to_sq(fcport, xid, 0, FCOE_TASK_TYPE_ABTS, 0);
/* Ring doorbell */
qedf_ring_doorbell(fcport);
spin_unlock_irqrestore(&fcport->rport_lock, flags);
return rc;
abts_err:
/*
* If the ABTS task fails to queue then we need to cleanup the
* task at the firmware.
*/
qedf_initiate_cleanup(io_req, return_scsi_cmd_on_abts);
return rc;
}
void qedf_process_abts_compl(struct qedf_ctx *qedf, struct fcoe_cqe *cqe,
struct qedf_ioreq *io_req)
{
uint32_t r_ctl;
uint16_t xid;
QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_SCSI_TM, "Entered with xid = "
"0x%x cmd_type = %d\n", io_req->xid, io_req->cmd_type);
cancel_delayed_work(&io_req->timeout_work);
xid = io_req->xid;
r_ctl = cqe->cqe_info.abts_info.r_ctl;
switch (r_ctl) {
case FC_RCTL_BA_ACC:
QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_SCSI_TM,
"ABTS response - ACC Send RRQ after R_A_TOV\n");
io_req->event = QEDF_IOREQ_EV_ABORT_SUCCESS;
/*
* Dont release this cmd yet. It will be relesed
* after we get RRQ response
*/
kref_get(&io_req->refcount);
queue_delayed_work(qedf->dpc_wq, &io_req->rrq_work,
msecs_to_jiffies(qedf->lport->r_a_tov));
break;
/* For error cases let the cleanup return the command */
case FC_RCTL_BA_RJT:
QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_SCSI_TM,
"ABTS response - RJT\n");
io_req->event = QEDF_IOREQ_EV_ABORT_FAILED;
break;
default:
QEDF_ERR(&(qedf->dbg_ctx), "Unknown ABTS response\n");
break;
}
clear_bit(QEDF_CMD_IN_ABORT, &io_req->flags);
if (io_req->sc_cmd) {
if (io_req->return_scsi_cmd_on_abts)
qedf_scsi_done(qedf, io_req, DID_ERROR);
}
/* Notify eh_abort handler that ABTS is complete */
complete(&io_req->abts_done);
kref_put(&io_req->refcount, qedf_release_cmd);
}
int qedf_init_mp_req(struct qedf_ioreq *io_req)
{
struct qedf_mp_req *mp_req;
struct fcoe_sge *mp_req_bd;
struct fcoe_sge *mp_resp_bd;
struct qedf_ctx *qedf = io_req->fcport->qedf;
dma_addr_t addr;
uint64_t sz;
QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_MP_REQ, "Entered.\n");
mp_req = (struct qedf_mp_req *)&(io_req->mp_req);
memset(mp_req, 0, sizeof(struct qedf_mp_req));
if (io_req->cmd_type != QEDF_ELS) {
mp_req->req_len = sizeof(struct fcp_cmnd);
io_req->data_xfer_len = mp_req->req_len;
} else
mp_req->req_len = io_req->data_xfer_len;
mp_req->req_buf = dma_alloc_coherent(&qedf->pdev->dev, QEDF_PAGE_SIZE,
&mp_req->req_buf_dma, GFP_KERNEL);
if (!mp_req->req_buf) {
QEDF_ERR(&(qedf->dbg_ctx), "Unable to alloc MP req buffer\n");
qedf_free_mp_resc(io_req);
return -ENOMEM;
}
mp_req->resp_buf = dma_alloc_coherent(&qedf->pdev->dev,
QEDF_PAGE_SIZE, &mp_req->resp_buf_dma, GFP_KERNEL);
if (!mp_req->resp_buf) {
QEDF_ERR(&(qedf->dbg_ctx), "Unable to alloc TM resp "
"buffer\n");
qedf_free_mp_resc(io_req);
return -ENOMEM;
}
/* Allocate and map mp_req_bd and mp_resp_bd */
sz = sizeof(struct fcoe_sge);
mp_req->mp_req_bd = dma_alloc_coherent(&qedf->pdev->dev, sz,
&mp_req->mp_req_bd_dma, GFP_KERNEL);
if (!mp_req->mp_req_bd) {
QEDF_ERR(&(qedf->dbg_ctx), "Unable to alloc MP req bd\n");
qedf_free_mp_resc(io_req);
return -ENOMEM;
}
mp_req->mp_resp_bd = dma_alloc_coherent(&qedf->pdev->dev, sz,
&mp_req->mp_resp_bd_dma, GFP_KERNEL);
if (!mp_req->mp_resp_bd) {
QEDF_ERR(&(qedf->dbg_ctx), "Unable to alloc MP resp bd\n");
qedf_free_mp_resc(io_req);
return -ENOMEM;
}
/* Fill bd table */
addr = mp_req->req_buf_dma;
mp_req_bd = mp_req->mp_req_bd;
mp_req_bd->sge_addr.lo = U64_LO(addr);
mp_req_bd->sge_addr.hi = U64_HI(addr);
mp_req_bd->size = QEDF_PAGE_SIZE;
/*
* MP buffer is either a task mgmt command or an ELS.
* So the assumption is that it consumes a single bd
* entry in the bd table
*/
mp_resp_bd = mp_req->mp_resp_bd;
addr = mp_req->resp_buf_dma;
mp_resp_bd->sge_addr.lo = U64_LO(addr);
mp_resp_bd->sge_addr.hi = U64_HI(addr);
mp_resp_bd->size = QEDF_PAGE_SIZE;
return 0;
}
/*
* Last ditch effort to clear the port if it's stuck. Used only after a
* cleanup task times out.
*/
static void qedf_drain_request(struct qedf_ctx *qedf)
{
if (test_bit(QEDF_DRAIN_ACTIVE, &qedf->flags)) {
QEDF_ERR(&(qedf->dbg_ctx), "MCP drain already active.\n");
return;
}
/* Set bit to return all queuecommand requests as busy */
set_bit(QEDF_DRAIN_ACTIVE, &qedf->flags);
/* Call qed drain request for function. Should be synchronous */
qed_ops->common->drain(qedf->cdev);
/* Settle time for CQEs to be returned */
msleep(100);
/* Unplug and continue */
clear_bit(QEDF_DRAIN_ACTIVE, &qedf->flags);
}
/*
* Returns SUCCESS if the cleanup task does not timeout, otherwise return
* FAILURE.
*/
int qedf_initiate_cleanup(struct qedf_ioreq *io_req,
bool return_scsi_cmd_on_abts)
{
struct qedf_rport *fcport;
struct qedf_ctx *qedf;
uint16_t xid;
struct fcoe_task_context *task;
int tmo = 0;
int rc = SUCCESS;
unsigned long flags;
fcport = io_req->fcport;
if (!fcport) {
QEDF_ERR(NULL, "fcport is NULL.\n");
return SUCCESS;
}
qedf = fcport->qedf;
if (!qedf) {
QEDF_ERR(NULL, "qedf is NULL.\n");
return SUCCESS;
}
if (!test_bit(QEDF_CMD_OUTSTANDING, &io_req->flags) ||
test_bit(QEDF_CMD_IN_CLEANUP, &io_req->flags)) {
QEDF_ERR(&(qedf->dbg_ctx), "io_req xid=0x%x already in "
"cleanup processing or already completed.\n",
io_req->xid);
return SUCCESS;
}
/* Ensure room on SQ */
if (!atomic_read(&fcport->free_sqes)) {
QEDF_ERR(&(qedf->dbg_ctx), "No SQ entries available\n");
return FAILED;
}
QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO, "Entered xid=0x%x\n",
io_req->xid);
/* Cleanup cmds re-use the same TID as the original I/O */
xid = io_req->xid;
io_req->cmd_type = QEDF_CLEANUP;
io_req->return_scsi_cmd_on_abts = return_scsi_cmd_on_abts;
/* Set the return CPU to be the same as the request one */
io_req->cpu = smp_processor_id();
set_bit(QEDF_CMD_IN_CLEANUP, &io_req->flags);
task = qedf_get_task_mem(&qedf->tasks, xid);
init_completion(&io_req->tm_done);
/* Obtain free SQ entry */
spin_lock_irqsave(&fcport->rport_lock, flags);
qedf_add_to_sq(fcport, xid, 0, FCOE_TASK_TYPE_EXCHANGE_CLEANUP, 0);
/* Ring doorbell */
qedf_ring_doorbell(fcport);
spin_unlock_irqrestore(&fcport->rport_lock, flags);
tmo = wait_for_completion_timeout(&io_req->tm_done,
QEDF_CLEANUP_TIMEOUT * HZ);
if (!tmo) {
rc = FAILED;
/* Timeout case */
QEDF_ERR(&(qedf->dbg_ctx), "Cleanup command timeout, "
"xid=%x.\n", io_req->xid);
clear_bit(QEDF_CMD_IN_CLEANUP, &io_req->flags);
/* Issue a drain request if cleanup task times out */
QEDF_ERR(&(qedf->dbg_ctx), "Issuing MCP drain request.\n");
qedf_drain_request(qedf);
}
if (io_req->sc_cmd) {
if (io_req->return_scsi_cmd_on_abts)
qedf_scsi_done(qedf, io_req, DID_ERROR);
}
if (rc == SUCCESS)
io_req->event = QEDF_IOREQ_EV_CLEANUP_SUCCESS;
else
io_req->event = QEDF_IOREQ_EV_CLEANUP_FAILED;
return rc;
}
void qedf_process_cleanup_compl(struct qedf_ctx *qedf, struct fcoe_cqe *cqe,
struct qedf_ioreq *io_req)
{
QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_IO, "Entered xid = 0x%x\n",
io_req->xid);
clear_bit(QEDF_CMD_IN_CLEANUP, &io_req->flags);
/* Complete so we can finish cleaning up the I/O */
complete(&io_req->tm_done);
}
static int qedf_execute_tmf(struct qedf_rport *fcport, struct scsi_cmnd *sc_cmd,
uint8_t tm_flags)
{
struct qedf_ioreq *io_req;
struct qedf_mp_req *tm_req;
struct fcoe_task_context *task;
struct fc_frame_header *fc_hdr;
struct fcp_cmnd *fcp_cmnd;
struct qedf_ctx *qedf = fcport->qedf;
int rc = 0;
uint16_t xid;
uint32_t sid, did;
int tmo = 0;
unsigned long flags;
if (!sc_cmd) {
QEDF_ERR(&(qedf->dbg_ctx), "invalid arg\n");
return FAILED;
}
if (!(test_bit(QEDF_RPORT_SESSION_READY, &fcport->flags))) {
QEDF_ERR(&(qedf->dbg_ctx), "fcport not offloaded\n");
rc = FAILED;
return FAILED;
}
QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_SCSI_TM, "portid = 0x%x "
"tm_flags = %d\n", fcport->rdata->ids.port_id, tm_flags);
io_req = qedf_alloc_cmd(fcport, QEDF_TASK_MGMT_CMD);
if (!io_req) {
QEDF_ERR(&(qedf->dbg_ctx), "Failed TMF");
rc = -EAGAIN;
goto reset_tmf_err;
}
/* Initialize rest of io_req fields */
io_req->sc_cmd = sc_cmd;
io_req->fcport = fcport;
io_req->cmd_type = QEDF_TASK_MGMT_CMD;
/* Set the return CPU to be the same as the request one */
io_req->cpu = smp_processor_id();
tm_req = (struct qedf_mp_req *)&(io_req->mp_req);
rc = qedf_init_mp_req(io_req);
if (rc == FAILED) {
QEDF_ERR(&(qedf->dbg_ctx), "Task mgmt MP request init "
"failed\n");
kref_put(&io_req->refcount, qedf_release_cmd);
goto reset_tmf_err;
}
/* Set TM flags */
io_req->io_req_flags = 0;
tm_req->tm_flags = tm_flags;
/* Default is to return a SCSI command when an error occurs */
io_req->return_scsi_cmd_on_abts = true;
/* Fill FCP_CMND */
qedf_build_fcp_cmnd(io_req, (struct fcp_cmnd *)tm_req->req_buf);
fcp_cmnd = (struct fcp_cmnd *)tm_req->req_buf;
memset(fcp_cmnd->fc_cdb, 0, FCP_CMND_LEN);
fcp_cmnd->fc_dl = 0;
/* Fill FC header */
fc_hdr = &(tm_req->req_fc_hdr);
sid = fcport->sid;
did = fcport->rdata->ids.port_id;
__fc_fill_fc_hdr(fc_hdr, FC_RCTL_DD_UNSOL_CMD, sid, did,
FC_TYPE_FCP, FC_FC_FIRST_SEQ | FC_FC_END_SEQ |
FC_FC_SEQ_INIT, 0);
/* Obtain exchange id */
xid = io_req->xid;
QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_SCSI_TM, "TMF io_req xid = "
"0x%x\n", xid);
/* Initialize task context for this IO request */
task = qedf_get_task_mem(&qedf->tasks, xid);
qedf_init_mp_task(io_req, task);
init_completion(&io_req->tm_done);
/* Obtain free SQ entry */
spin_lock_irqsave(&fcport->rport_lock, flags);
qedf_add_to_sq(fcport, xid, 0, FCOE_TASK_TYPE_MIDPATH, 0);
/* Ring doorbell */
qedf_ring_doorbell(fcport);
spin_unlock_irqrestore(&fcport->rport_lock, flags);
tmo = wait_for_completion_timeout(&io_req->tm_done,
QEDF_TM_TIMEOUT * HZ);
if (!tmo) {
rc = FAILED;
QEDF_ERR(&(qedf->dbg_ctx), "wait for tm_cmpl timeout!\n");
} else {
/* Check TMF response code */
if (io_req->fcp_rsp_code == 0)
rc = SUCCESS;
else
rc = FAILED;
}
if (tm_flags == FCP_TMF_LUN_RESET)
qedf_flush_active_ios(fcport, (int)sc_cmd->device->lun);
else
qedf_flush_active_ios(fcport, -1);
kref_put(&io_req->refcount, qedf_release_cmd);
if (rc != SUCCESS) {
QEDF_ERR(&(qedf->dbg_ctx), "task mgmt command failed...\n");
rc = FAILED;
} else {
QEDF_ERR(&(qedf->dbg_ctx), "task mgmt command success...\n");
rc = SUCCESS;
}
reset_tmf_err:
return rc;
}
int qedf_initiate_tmf(struct scsi_cmnd *sc_cmd, u8 tm_flags)
{
struct fc_rport *rport = starget_to_rport(scsi_target(sc_cmd->device));
struct fc_rport_libfc_priv *rp = rport->dd_data;
struct qedf_rport *fcport = (struct qedf_rport *)&rp[1];
struct qedf_ctx *qedf;
struct fc_lport *lport;
int rc = SUCCESS;
int rval;
rval = fc_remote_port_chkready(rport);
if (rval) {
QEDF_ERR(NULL, "device_reset rport not ready\n");
rc = FAILED;
goto tmf_err;
}
if (fcport == NULL) {
QEDF_ERR(NULL, "device_reset: rport is NULL\n");
rc = FAILED;
goto tmf_err;
}
qedf = fcport->qedf;
lport = qedf->lport;
if (test_bit(QEDF_UNLOADING, &qedf->flags) ||
test_bit(QEDF_DBG_STOP_IO, &qedf->flags)) {
rc = SUCCESS;
goto tmf_err;
}
if (lport->state != LPORT_ST_READY || !(lport->link_up)) {
QEDF_ERR(&(qedf->dbg_ctx), "link is not ready\n");
rc = FAILED;
goto tmf_err;
}
rc = qedf_execute_tmf(fcport, sc_cmd, tm_flags);
tmf_err:
return rc;
}
void qedf_process_tmf_compl(struct qedf_ctx *qedf, struct fcoe_cqe *cqe,
struct qedf_ioreq *io_req)
{
struct fcoe_cqe_rsp_info *fcp_rsp;
struct fcoe_cqe_midpath_info *mp_info;
/* Get TMF response length from CQE */
mp_info = &cqe->cqe_info.midpath_info;
io_req->mp_req.resp_len = mp_info->data_placement_size;
QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_SCSI_TM,
"Response len is %d.\n", io_req->mp_req.resp_len);
fcp_rsp = &cqe->cqe_info.rsp_info;
qedf_parse_fcp_rsp(io_req, fcp_rsp);
io_req->sc_cmd = NULL;
complete(&io_req->tm_done);
}
void qedf_process_unsol_compl(struct qedf_ctx *qedf, uint16_t que_idx,
struct fcoe_cqe *cqe)
{
unsigned long flags;
uint16_t tmp;
uint16_t pktlen = cqe->cqe_info.unsolic_info.pkt_len;
u32 payload_len, crc;
struct fc_frame_header *fh;
struct fc_frame *fp;
struct qedf_io_work *io_work;
u32 bdq_idx;
void *bdq_addr;
QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_UNSOL,
"address.hi=%x address.lo=%x opaque_data.hi=%x "
"opaque_data.lo=%x bdq_prod_idx=%u len=%u.\n",
le32_to_cpu(cqe->cqe_info.unsolic_info.bd_info.address.hi),
le32_to_cpu(cqe->cqe_info.unsolic_info.bd_info.address.lo),
le32_to_cpu(cqe->cqe_info.unsolic_info.bd_info.opaque.hi),
le32_to_cpu(cqe->cqe_info.unsolic_info.bd_info.opaque.lo),
qedf->bdq_prod_idx, pktlen);
bdq_idx = le32_to_cpu(cqe->cqe_info.unsolic_info.bd_info.opaque.lo);
if (bdq_idx >= QEDF_BDQ_SIZE) {
QEDF_ERR(&(qedf->dbg_ctx), "bdq_idx is out of range %d.\n",
bdq_idx);
goto increment_prod;
}
bdq_addr = qedf->bdq[bdq_idx].buf_addr;
if (!bdq_addr) {
QEDF_ERR(&(qedf->dbg_ctx), "bdq_addr is NULL, dropping "
"unsolicited packet.\n");
goto increment_prod;
}
if (qedf_dump_frames) {
QEDF_INFO(&(qedf->dbg_ctx), QEDF_LOG_UNSOL,
"BDQ frame is at addr=%p.\n", bdq_addr);
print_hex_dump(KERN_WARNING, "bdq ", DUMP_PREFIX_OFFSET, 16, 1,
(void *)bdq_addr, pktlen, false);
}
/* Allocate frame */
payload_len = pktlen - sizeof(struct fc_frame_header);
fp = fc_frame_alloc(qedf->lport, payload_len);
if (!fp) {
QEDF_ERR(&(qedf->dbg_ctx), "Could not allocate fp.\n");
goto increment_prod;
}
/* Copy data from BDQ buffer into fc_frame struct */
fh = (struct fc_frame_header *)fc_frame_header_get(fp);
memcpy(fh, (void *)bdq_addr, pktlen);
/* Initialize the frame so libfc sees it as a valid frame */
crc = fcoe_fc_crc(fp);
fc_frame_init(fp);
fr_dev(fp) = qedf->lport;
fr_sof(fp) = FC_SOF_I3;
fr_eof(fp) = FC_EOF_T;
fr_crc(fp) = cpu_to_le32(~crc);
/*
* We need to return the frame back up to libfc in a non-atomic
* context
*/
io_work = mempool_alloc(qedf->io_mempool, GFP_ATOMIC);
if (!io_work) {
QEDF_WARN(&(qedf->dbg_ctx), "Could not allocate "
"work for I/O completion.\n");
fc_frame_free(fp);
goto increment_prod;
}
memset(io_work, 0, sizeof(struct qedf_io_work));
INIT_WORK(&io_work->work, qedf_fp_io_handler);
/* Copy contents of CQE for deferred processing */
memcpy(&io_work->cqe, cqe, sizeof(struct fcoe_cqe));
io_work->qedf = qedf;
io_work->fp = fp;
queue_work_on(smp_processor_id(), qedf_io_wq, &io_work->work);
increment_prod:
spin_lock_irqsave(&qedf->hba_lock, flags);
/* Increment producer to let f/w know we've handled the frame */
qedf->bdq_prod_idx++;
/* Producer index wraps at uint16_t boundary */
if (qedf->bdq_prod_idx == 0xffff)
qedf->bdq_prod_idx = 0;
writew(qedf->bdq_prod_idx, qedf->bdq_primary_prod);
tmp = readw(qedf->bdq_primary_prod);
writew(qedf->bdq_prod_idx, qedf->bdq_secondary_prod);
tmp = readw(qedf->bdq_secondary_prod);
spin_unlock_irqrestore(&qedf->hba_lock, flags);
}
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