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authorLinus Torvalds <torvalds@linux-foundation.org>2017-08-11 12:26:49 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-08-11 12:26:49 -0700
commite0d0e045b862da06f2a694696797b2c46ae8bc4f (patch)
tree896fcaa9b7f6102e234179a2b02197407a072008
parent0993133bb8e7a75524748ffed52c62e81c42b3e8 (diff)
parent4a8b53be64045fe74398c178041463318f96d5e9 (diff)
downloadlinux-stericsson-e0d0e045b862da06f2a694696797b2c46ae8bc4f.tar.gz
Merge branch 'for-linus' of git://git.kernel.dk/linux-block
Pull block fixes from Jens Axboe: "A set of fixes that should go into this series. This contains: - Fix from Bart for blk-mq requeue queue running, preventing a continued loop of run/restart. - Fix for a bio/blk-integrity issue, in two parts. One from Christoph, fixing where verification happens, and one from Milan, for a NULL profile. - NVMe pull request, most of the changes being for nvme-fc, but also a few trivial core/pci fixes" * 'for-linus' of git://git.kernel.dk/linux-block: nvme: fix directive command numd calculation nvme: fix nvme reset command timeout handling nvme-pci: fix CMB sysfs file removal in reset path lpfc: support nvmet_fc defer_rcv callback nvmet_fc: add defer_req callback for deferment of cmd buffer return nvme: strip trailing 0-bytes in wwid_show block: Make blk_mq_delay_kick_requeue_list() rerun the queue at a quiet time bio-integrity: only verify integrity on the lowest stacked driver bio-integrity: Fix regression if profile verify_fn is NULL
-rw-r--r--block/bio-integrity.c6
-rw-r--r--block/blk-mq.c4
-rw-r--r--drivers/nvme/host/core.c35
-rw-r--r--drivers/nvme/host/pci.c18
-rw-r--r--drivers/nvme/target/fc.c212
-rw-r--r--drivers/scsi/lpfc/lpfc_attr.c4
-rw-r--r--drivers/scsi/lpfc/lpfc_debugfs.c5
-rw-r--r--drivers/scsi/lpfc/lpfc_nvmet.c30
-rw-r--r--drivers/scsi/lpfc/lpfc_nvmet.h1
-rw-r--r--include/linux/nvme-fc-driver.h7
10 files changed, 267 insertions, 55 deletions
diff --git a/block/bio-integrity.c b/block/bio-integrity.c
index 83e92beb3c9f..9b1ea478577b 100644
--- a/block/bio-integrity.c
+++ b/block/bio-integrity.c
@@ -387,9 +387,11 @@ static void bio_integrity_verify_fn(struct work_struct *work)
*/
bool __bio_integrity_endio(struct bio *bio)
{
- if (bio_op(bio) == REQ_OP_READ && !bio->bi_status) {
- struct bio_integrity_payload *bip = bio_integrity(bio);
+ struct blk_integrity *bi = bdev_get_integrity(bio->bi_bdev);
+ struct bio_integrity_payload *bip = bio_integrity(bio);
+ if (bio_op(bio) == REQ_OP_READ && !bio->bi_status &&
+ (bip->bip_flags & BIP_BLOCK_INTEGRITY) && bi->profile->verify_fn) {
INIT_WORK(&bip->bip_work, bio_integrity_verify_fn);
queue_work(kintegrityd_wq, &bip->bip_work);
return false;
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 211ef367345f..535cbdf32aab 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -684,8 +684,8 @@ EXPORT_SYMBOL(blk_mq_kick_requeue_list);
void blk_mq_delay_kick_requeue_list(struct request_queue *q,
unsigned long msecs)
{
- kblockd_schedule_delayed_work(&q->requeue_work,
- msecs_to_jiffies(msecs));
+ kblockd_mod_delayed_work_on(WORK_CPU_UNBOUND, &q->requeue_work,
+ msecs_to_jiffies(msecs));
}
EXPORT_SYMBOL(blk_mq_delay_kick_requeue_list);
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index c49f1f8b2e57..37046ac2c441 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -336,7 +336,7 @@ static int nvme_get_stream_params(struct nvme_ctrl *ctrl,
c.directive.opcode = nvme_admin_directive_recv;
c.directive.nsid = cpu_to_le32(nsid);
- c.directive.numd = cpu_to_le32(sizeof(*s));
+ c.directive.numd = cpu_to_le32((sizeof(*s) >> 2) - 1);
c.directive.doper = NVME_DIR_RCV_ST_OP_PARAM;
c.directive.dtype = NVME_DIR_STREAMS;
@@ -1509,7 +1509,7 @@ static void nvme_set_queue_limits(struct nvme_ctrl *ctrl,
blk_queue_write_cache(q, vwc, vwc);
}
-static void nvme_configure_apst(struct nvme_ctrl *ctrl)
+static int nvme_configure_apst(struct nvme_ctrl *ctrl)
{
/*
* APST (Autonomous Power State Transition) lets us program a
@@ -1538,16 +1538,16 @@ static void nvme_configure_apst(struct nvme_ctrl *ctrl)
* then don't do anything.
*/
if (!ctrl->apsta)
- return;
+ return 0;
if (ctrl->npss > 31) {
dev_warn(ctrl->device, "NPSS is invalid; not using APST\n");
- return;
+ return 0;
}
table = kzalloc(sizeof(*table), GFP_KERNEL);
if (!table)
- return;
+ return 0;
if (!ctrl->apst_enabled || ctrl->ps_max_latency_us == 0) {
/* Turn off APST. */
@@ -1629,6 +1629,7 @@ static void nvme_configure_apst(struct nvme_ctrl *ctrl)
dev_err(ctrl->device, "failed to set APST feature (%d)\n", ret);
kfree(table);
+ return ret;
}
static void nvme_set_latency_tolerance(struct device *dev, s32 val)
@@ -1835,13 +1836,16 @@ int nvme_init_identify(struct nvme_ctrl *ctrl)
* In fabrics we need to verify the cntlid matches the
* admin connect
*/
- if (ctrl->cntlid != le16_to_cpu(id->cntlid))
+ if (ctrl->cntlid != le16_to_cpu(id->cntlid)) {
ret = -EINVAL;
+ goto out_free;
+ }
if (!ctrl->opts->discovery_nqn && !ctrl->kas) {
dev_err(ctrl->device,
"keep-alive support is mandatory for fabrics\n");
ret = -EINVAL;
+ goto out_free;
}
} else {
ctrl->cntlid = le16_to_cpu(id->cntlid);
@@ -1856,11 +1860,20 @@ int nvme_init_identify(struct nvme_ctrl *ctrl)
else if (!ctrl->apst_enabled && prev_apst_enabled)
dev_pm_qos_hide_latency_tolerance(ctrl->device);
- nvme_configure_apst(ctrl);
- nvme_configure_directives(ctrl);
+ ret = nvme_configure_apst(ctrl);
+ if (ret < 0)
+ return ret;
+
+ ret = nvme_configure_directives(ctrl);
+ if (ret < 0)
+ return ret;
ctrl->identified = true;
+ return 0;
+
+out_free:
+ kfree(id);
return ret;
}
EXPORT_SYMBOL_GPL(nvme_init_identify);
@@ -2004,9 +2017,11 @@ static ssize_t wwid_show(struct device *dev, struct device_attribute *attr,
if (memchr_inv(ns->eui, 0, sizeof(ns->eui)))
return sprintf(buf, "eui.%8phN\n", ns->eui);
- while (ctrl->serial[serial_len - 1] == ' ')
+ while (serial_len > 0 && (ctrl->serial[serial_len - 1] == ' ' ||
+ ctrl->serial[serial_len - 1] == '\0'))
serial_len--;
- while (ctrl->model[model_len - 1] == ' ')
+ while (model_len > 0 && (ctrl->model[model_len - 1] == ' ' ||
+ ctrl->model[model_len - 1] == '\0'))
model_len--;
return sprintf(buf, "nvme.%04x-%*phN-%*phN-%08x\n", ctrl->vid,
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index cd888a47d0fc..74a124a06264 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -1558,11 +1558,9 @@ static inline void nvme_release_cmb(struct nvme_dev *dev)
if (dev->cmb) {
iounmap(dev->cmb);
dev->cmb = NULL;
- if (dev->cmbsz) {
- sysfs_remove_file_from_group(&dev->ctrl.device->kobj,
- &dev_attr_cmb.attr, NULL);
- dev->cmbsz = 0;
- }
+ sysfs_remove_file_from_group(&dev->ctrl.device->kobj,
+ &dev_attr_cmb.attr, NULL);
+ dev->cmbsz = 0;
}
}
@@ -1953,16 +1951,14 @@ static int nvme_pci_enable(struct nvme_dev *dev)
/*
* CMBs can currently only exist on >=1.2 PCIe devices. We only
- * populate sysfs if a CMB is implemented. Note that we add the
- * CMB attribute to the nvme_ctrl kobj which removes the need to remove
- * it on exit. Since nvme_dev_attrs_group has no name we can pass
- * NULL as final argument to sysfs_add_file_to_group.
+ * populate sysfs if a CMB is implemented. Since nvme_dev_attrs_group
+ * has no name we can pass NULL as final argument to
+ * sysfs_add_file_to_group.
*/
if (readl(dev->bar + NVME_REG_VS) >= NVME_VS(1, 2, 0)) {
dev->cmb = nvme_map_cmb(dev);
-
- if (dev->cmbsz) {
+ if (dev->cmb) {
if (sysfs_add_file_to_group(&dev->ctrl.device->kobj,
&dev_attr_cmb.attr, NULL))
dev_warn(dev->ctrl.device,
diff --git a/drivers/nvme/target/fc.c b/drivers/nvme/target/fc.c
index 31ca55dfcb1d..1b7f2520a20d 100644
--- a/drivers/nvme/target/fc.c
+++ b/drivers/nvme/target/fc.c
@@ -114,6 +114,11 @@ struct nvmet_fc_tgtport {
struct kref ref;
};
+struct nvmet_fc_defer_fcp_req {
+ struct list_head req_list;
+ struct nvmefc_tgt_fcp_req *fcp_req;
+};
+
struct nvmet_fc_tgt_queue {
bool ninetypercent;
u16 qid;
@@ -132,6 +137,8 @@ struct nvmet_fc_tgt_queue {
struct nvmet_fc_tgt_assoc *assoc;
struct nvmet_fc_fcp_iod *fod; /* array of fcp_iods */
struct list_head fod_list;
+ struct list_head pending_cmd_list;
+ struct list_head avail_defer_list;
struct workqueue_struct *work_q;
struct kref ref;
} __aligned(sizeof(unsigned long long));
@@ -223,6 +230,8 @@ static void nvmet_fc_tgt_q_put(struct nvmet_fc_tgt_queue *queue);
static int nvmet_fc_tgt_q_get(struct nvmet_fc_tgt_queue *queue);
static void nvmet_fc_tgtport_put(struct nvmet_fc_tgtport *tgtport);
static int nvmet_fc_tgtport_get(struct nvmet_fc_tgtport *tgtport);
+static void nvmet_fc_handle_fcp_rqst(struct nvmet_fc_tgtport *tgtport,
+ struct nvmet_fc_fcp_iod *fod);
/* *********************** FC-NVME DMA Handling **************************** */
@@ -463,9 +472,9 @@ static struct nvmet_fc_fcp_iod *
nvmet_fc_alloc_fcp_iod(struct nvmet_fc_tgt_queue *queue)
{
static struct nvmet_fc_fcp_iod *fod;
- unsigned long flags;
- spin_lock_irqsave(&queue->qlock, flags);
+ lockdep_assert_held(&queue->qlock);
+
fod = list_first_entry_or_null(&queue->fod_list,
struct nvmet_fc_fcp_iod, fcp_list);
if (fod) {
@@ -477,17 +486,37 @@ nvmet_fc_alloc_fcp_iod(struct nvmet_fc_tgt_queue *queue)
* will "inherit" that reference.
*/
}
- spin_unlock_irqrestore(&queue->qlock, flags);
return fod;
}
static void
+nvmet_fc_queue_fcp_req(struct nvmet_fc_tgtport *tgtport,
+ struct nvmet_fc_tgt_queue *queue,
+ struct nvmefc_tgt_fcp_req *fcpreq)
+{
+ struct nvmet_fc_fcp_iod *fod = fcpreq->nvmet_fc_private;
+
+ /*
+ * put all admin cmds on hw queue id 0. All io commands go to
+ * the respective hw queue based on a modulo basis
+ */
+ fcpreq->hwqid = queue->qid ?
+ ((queue->qid - 1) % tgtport->ops->max_hw_queues) : 0;
+
+ if (tgtport->ops->target_features & NVMET_FCTGTFEAT_CMD_IN_ISR)
+ queue_work_on(queue->cpu, queue->work_q, &fod->work);
+ else
+ nvmet_fc_handle_fcp_rqst(tgtport, fod);
+}
+
+static void
nvmet_fc_free_fcp_iod(struct nvmet_fc_tgt_queue *queue,
struct nvmet_fc_fcp_iod *fod)
{
struct nvmefc_tgt_fcp_req *fcpreq = fod->fcpreq;
struct nvmet_fc_tgtport *tgtport = fod->tgtport;
+ struct nvmet_fc_defer_fcp_req *deferfcp;
unsigned long flags;
fc_dma_sync_single_for_cpu(tgtport->dev, fod->rspdma,
@@ -495,21 +524,56 @@ nvmet_fc_free_fcp_iod(struct nvmet_fc_tgt_queue *queue,
fcpreq->nvmet_fc_private = NULL;
- spin_lock_irqsave(&queue->qlock, flags);
- list_add_tail(&fod->fcp_list, &fod->queue->fod_list);
fod->active = false;
fod->abort = false;
fod->aborted = false;
fod->writedataactive = false;
fod->fcpreq = NULL;
+
+ tgtport->ops->fcp_req_release(&tgtport->fc_target_port, fcpreq);
+
+ spin_lock_irqsave(&queue->qlock, flags);
+ deferfcp = list_first_entry_or_null(&queue->pending_cmd_list,
+ struct nvmet_fc_defer_fcp_req, req_list);
+ if (!deferfcp) {
+ list_add_tail(&fod->fcp_list, &fod->queue->fod_list);
+ spin_unlock_irqrestore(&queue->qlock, flags);
+
+ /* Release reference taken at queue lookup and fod allocation */
+ nvmet_fc_tgt_q_put(queue);
+ return;
+ }
+
+ /* Re-use the fod for the next pending cmd that was deferred */
+ list_del(&deferfcp->req_list);
+
+ fcpreq = deferfcp->fcp_req;
+
+ /* deferfcp can be reused for another IO at a later date */
+ list_add_tail(&deferfcp->req_list, &queue->avail_defer_list);
+
spin_unlock_irqrestore(&queue->qlock, flags);
+ /* Save NVME CMD IO in fod */
+ memcpy(&fod->cmdiubuf, fcpreq->rspaddr, fcpreq->rsplen);
+
+ /* Setup new fcpreq to be processed */
+ fcpreq->rspaddr = NULL;
+ fcpreq->rsplen = 0;
+ fcpreq->nvmet_fc_private = fod;
+ fod->fcpreq = fcpreq;
+ fod->active = true;
+
+ /* inform LLDD IO is now being processed */
+ tgtport->ops->defer_rcv(&tgtport->fc_target_port, fcpreq);
+
+ /* Submit deferred IO for processing */
+ nvmet_fc_queue_fcp_req(tgtport, queue, fcpreq);
+
/*
- * release the reference taken at queue lookup and fod allocation
+ * Leave the queue lookup get reference taken when
+ * fod was originally allocated.
*/
- nvmet_fc_tgt_q_put(queue);
-
- tgtport->ops->fcp_req_release(&tgtport->fc_target_port, fcpreq);
}
static int
@@ -569,6 +633,8 @@ nvmet_fc_alloc_target_queue(struct nvmet_fc_tgt_assoc *assoc,
queue->port = assoc->tgtport->port;
queue->cpu = nvmet_fc_queue_to_cpu(assoc->tgtport, qid);
INIT_LIST_HEAD(&queue->fod_list);
+ INIT_LIST_HEAD(&queue->avail_defer_list);
+ INIT_LIST_HEAD(&queue->pending_cmd_list);
atomic_set(&queue->connected, 0);
atomic_set(&queue->sqtail, 0);
atomic_set(&queue->rsn, 1);
@@ -638,6 +704,7 @@ nvmet_fc_delete_target_queue(struct nvmet_fc_tgt_queue *queue)
{
struct nvmet_fc_tgtport *tgtport = queue->assoc->tgtport;
struct nvmet_fc_fcp_iod *fod = queue->fod;
+ struct nvmet_fc_defer_fcp_req *deferfcp;
unsigned long flags;
int i, writedataactive;
bool disconnect;
@@ -666,6 +733,35 @@ nvmet_fc_delete_target_queue(struct nvmet_fc_tgt_queue *queue)
}
}
}
+
+ /* Cleanup defer'ed IOs in queue */
+ list_for_each_entry(deferfcp, &queue->avail_defer_list, req_list) {
+ list_del(&deferfcp->req_list);
+ kfree(deferfcp);
+ }
+
+ for (;;) {
+ deferfcp = list_first_entry_or_null(&queue->pending_cmd_list,
+ struct nvmet_fc_defer_fcp_req, req_list);
+ if (!deferfcp)
+ break;
+
+ list_del(&deferfcp->req_list);
+ spin_unlock_irqrestore(&queue->qlock, flags);
+
+ tgtport->ops->defer_rcv(&tgtport->fc_target_port,
+ deferfcp->fcp_req);
+
+ tgtport->ops->fcp_abort(&tgtport->fc_target_port,
+ deferfcp->fcp_req);
+
+ tgtport->ops->fcp_req_release(&tgtport->fc_target_port,
+ deferfcp->fcp_req);
+
+ kfree(deferfcp);
+
+ spin_lock_irqsave(&queue->qlock, flags);
+ }
spin_unlock_irqrestore(&queue->qlock, flags);
flush_workqueue(queue->work_q);
@@ -2172,11 +2268,38 @@ nvmet_fc_handle_fcp_rqst_work(struct work_struct *work)
* Pass a FC-NVME FCP CMD IU received from the FC link to the nvmet-fc
* layer for processing.
*
- * The nvmet-fc layer will copy cmd payload to an internal structure for
- * processing. As such, upon completion of the routine, the LLDD may
- * immediately free/reuse the CMD IU buffer passed in the call.
+ * The nvmet_fc layer allocates a local job structure (struct
+ * nvmet_fc_fcp_iod) from the queue for the io and copies the
+ * CMD IU buffer to the job structure. As such, on a successful
+ * completion (returns 0), the LLDD may immediately free/reuse
+ * the CMD IU buffer passed in the call.
+ *
+ * However, in some circumstances, due to the packetized nature of FC
+ * and the api of the FC LLDD which may issue a hw command to send the
+ * response, but the LLDD may not get the hw completion for that command
+ * and upcall the nvmet_fc layer before a new command may be
+ * asynchronously received - its possible for a command to be received
+ * before the LLDD and nvmet_fc have recycled the job structure. It gives
+ * the appearance of more commands received than fits in the sq.
+ * To alleviate this scenario, a temporary queue is maintained in the
+ * transport for pending LLDD requests waiting for a queue job structure.
+ * In these "overrun" cases, a temporary queue element is allocated
+ * the LLDD request and CMD iu buffer information remembered, and the
+ * routine returns a -EOVERFLOW status. Subsequently, when a queue job
+ * structure is freed, it is immediately reallocated for anything on the
+ * pending request list. The LLDDs defer_rcv() callback is called,
+ * informing the LLDD that it may reuse the CMD IU buffer, and the io
+ * is then started normally with the transport.
*
- * If this routine returns error, the lldd should abort the exchange.
+ * The LLDD, when receiving an -EOVERFLOW completion status, is to treat
+ * the completion as successful but must not reuse the CMD IU buffer
+ * until the LLDD's defer_rcv() callback has been called for the
+ * corresponding struct nvmefc_tgt_fcp_req pointer.
+ *
+ * If there is any other condition in which an error occurs, the
+ * transport will return a non-zero status indicating the error.
+ * In all cases other than -EOVERFLOW, the transport has not accepted the
+ * request and the LLDD should abort the exchange.
*
* @target_port: pointer to the (registered) target port the FCP CMD IU
* was received on.
@@ -2194,6 +2317,8 @@ nvmet_fc_rcv_fcp_req(struct nvmet_fc_target_port *target_port,
struct nvme_fc_cmd_iu *cmdiu = cmdiubuf;
struct nvmet_fc_tgt_queue *queue;
struct nvmet_fc_fcp_iod *fod;
+ struct nvmet_fc_defer_fcp_req *deferfcp;
+ unsigned long flags;
/* validate iu, so the connection id can be used to find the queue */
if ((cmdiubuf_len != sizeof(*cmdiu)) ||
@@ -2214,29 +2339,60 @@ nvmet_fc_rcv_fcp_req(struct nvmet_fc_target_port *target_port,
* when the fod is freed.
*/
+ spin_lock_irqsave(&queue->qlock, flags);
+
fod = nvmet_fc_alloc_fcp_iod(queue);
- if (!fod) {
+ if (fod) {
+ spin_unlock_irqrestore(&queue->qlock, flags);
+
+ fcpreq->nvmet_fc_private = fod;
+ fod->fcpreq = fcpreq;
+
+ memcpy(&fod->cmdiubuf, cmdiubuf, cmdiubuf_len);
+
+ nvmet_fc_queue_fcp_req(tgtport, queue, fcpreq);
+
+ return 0;
+ }
+
+ if (!tgtport->ops->defer_rcv) {
+ spin_unlock_irqrestore(&queue->qlock, flags);
/* release the queue lookup reference */
nvmet_fc_tgt_q_put(queue);
return -ENOENT;
}
- fcpreq->nvmet_fc_private = fod;
- fod->fcpreq = fcpreq;
- /*
- * put all admin cmds on hw queue id 0. All io commands go to
- * the respective hw queue based on a modulo basis
- */
- fcpreq->hwqid = queue->qid ?
- ((queue->qid - 1) % tgtport->ops->max_hw_queues) : 0;
- memcpy(&fod->cmdiubuf, cmdiubuf, cmdiubuf_len);
+ deferfcp = list_first_entry_or_null(&queue->avail_defer_list,
+ struct nvmet_fc_defer_fcp_req, req_list);
+ if (deferfcp) {
+ /* Just re-use one that was previously allocated */
+ list_del(&deferfcp->req_list);
+ } else {
+ spin_unlock_irqrestore(&queue->qlock, flags);
- if (tgtport->ops->target_features & NVMET_FCTGTFEAT_CMD_IN_ISR)
- queue_work_on(queue->cpu, queue->work_q, &fod->work);
- else
- nvmet_fc_handle_fcp_rqst(tgtport, fod);
+ /* Now we need to dynamically allocate one */
+ deferfcp = kmalloc(sizeof(*deferfcp), GFP_KERNEL);
+ if (!deferfcp) {
+ /* release the queue lookup reference */
+ nvmet_fc_tgt_q_put(queue);
+ return -ENOMEM;
+ }
+ spin_lock_irqsave(&queue->qlock, flags);
+ }
- return 0;
+ /* For now, use rspaddr / rsplen to save payload information */
+ fcpreq->rspaddr = cmdiubuf;
+ fcpreq->rsplen = cmdiubuf_len;
+ deferfcp->fcp_req = fcpreq;
+
+ /* defer processing till a fod becomes available */
+ list_add_tail(&deferfcp->req_list, &queue->pending_cmd_list);
+
+ /* NOTE: the queue lookup reference is still valid */
+
+ spin_unlock_irqrestore(&queue->qlock, flags);
+
+ return -EOVERFLOW;
}
EXPORT_SYMBOL_GPL(nvmet_fc_rcv_fcp_req);
diff --git a/drivers/scsi/lpfc/lpfc_attr.c b/drivers/scsi/lpfc/lpfc_attr.c
index 4ed48ed38e79..7ee1a94c0b33 100644
--- a/drivers/scsi/lpfc/lpfc_attr.c
+++ b/drivers/scsi/lpfc/lpfc_attr.c
@@ -205,8 +205,10 @@ lpfc_nvme_info_show(struct device *dev, struct device_attribute *attr,
atomic_read(&tgtp->xmt_ls_rsp_error));
len += snprintf(buf+len, PAGE_SIZE-len,
- "FCP: Rcv %08x Release %08x Drop %08x\n",
+ "FCP: Rcv %08x Defer %08x Release %08x "
+ "Drop %08x\n",
atomic_read(&tgtp->rcv_fcp_cmd_in),
+ atomic_read(&tgtp->rcv_fcp_cmd_defer),
atomic_read(&tgtp->xmt_fcp_release),
atomic_read(&tgtp->rcv_fcp_cmd_drop));
diff --git a/drivers/scsi/lpfc/lpfc_debugfs.c b/drivers/scsi/lpfc/lpfc_debugfs.c
index 5cc8b0f7d885..744f3f395b64 100644
--- a/drivers/scsi/lpfc/lpfc_debugfs.c
+++ b/drivers/scsi/lpfc/lpfc_debugfs.c
@@ -782,8 +782,11 @@ lpfc_debugfs_nvmestat_data(struct lpfc_vport *vport, char *buf, int size)
atomic_read(&tgtp->xmt_ls_rsp_error));
len += snprintf(buf + len, size - len,
- "FCP: Rcv %08x Drop %08x\n",
+ "FCP: Rcv %08x Defer %08x Release %08x "
+ "Drop %08x\n",
atomic_read(&tgtp->rcv_fcp_cmd_in),
+ atomic_read(&tgtp->rcv_fcp_cmd_defer),
+ atomic_read(&tgtp->xmt_fcp_release),
atomic_read(&tgtp->rcv_fcp_cmd_drop));
if (atomic_read(&tgtp->rcv_fcp_cmd_in) !=
diff --git a/drivers/scsi/lpfc/lpfc_nvmet.c b/drivers/scsi/lpfc/lpfc_nvmet.c
index fbeec344c6cc..bbbd0f84160d 100644
--- a/drivers/scsi/lpfc/lpfc_nvmet.c
+++ b/drivers/scsi/lpfc/lpfc_nvmet.c
@@ -841,12 +841,31 @@ lpfc_nvmet_xmt_fcp_release(struct nvmet_fc_target_port *tgtport,
lpfc_nvmet_ctxbuf_post(phba, ctxp->ctxbuf);
}
+static void
+lpfc_nvmet_defer_rcv(struct nvmet_fc_target_port *tgtport,
+ struct nvmefc_tgt_fcp_req *rsp)
+{
+ struct lpfc_nvmet_tgtport *tgtp;
+ struct lpfc_nvmet_rcv_ctx *ctxp =
+ container_of(rsp, struct lpfc_nvmet_rcv_ctx, ctx.fcp_req);
+ struct rqb_dmabuf *nvmebuf = ctxp->rqb_buffer;
+ struct lpfc_hba *phba = ctxp->phba;
+
+ lpfc_nvmeio_data(phba, "NVMET DEFERRCV: xri x%x sz %d CPU %02x\n",
+ ctxp->oxid, ctxp->size, smp_processor_id());
+
+ tgtp = phba->targetport->private;
+ atomic_inc(&tgtp->rcv_fcp_cmd_defer);
+ lpfc_rq_buf_free(phba, &nvmebuf->hbuf); /* repost */
+}
+
static struct nvmet_fc_target_template lpfc_tgttemplate = {
.targetport_delete = lpfc_nvmet_targetport_delete,
.xmt_ls_rsp = lpfc_nvmet_xmt_ls_rsp,
.fcp_op = lpfc_nvmet_xmt_fcp_op,
.fcp_abort = lpfc_nvmet_xmt_fcp_abort,
.fcp_req_release = lpfc_nvmet_xmt_fcp_release,
+ .defer_rcv = lpfc_nvmet_defer_rcv,
.max_hw_queues = 1,
.max_sgl_segments = LPFC_NVMET_DEFAULT_SEGS,
@@ -1504,6 +1523,17 @@ lpfc_nvmet_unsol_fcp_buffer(struct lpfc_hba *phba,
return;
}
+ /* Processing of FCP command is deferred */
+ if (rc == -EOVERFLOW) {
+ lpfc_nvmeio_data(phba,
+ "NVMET RCV BUSY: xri x%x sz %d from %06x\n",
+ oxid, size, sid);
+ /* defer reposting rcv buffer till .defer_rcv callback */
+ ctxp->rqb_buffer = nvmebuf;
+ atomic_inc(&tgtp->rcv_fcp_cmd_out);
+ return;
+ }
+
atomic_inc(&tgtp->rcv_fcp_cmd_drop);
lpfc_printf_log(phba, KERN_ERR, LOG_NVME_IOERR,
"6159 FCP Drop IO x%x: err x%x: x%x x%x x%x\n",
diff --git a/drivers/scsi/lpfc/lpfc_nvmet.h b/drivers/scsi/lpfc/lpfc_nvmet.h
index e675ef17be08..48a76788b003 100644
--- a/drivers/scsi/lpfc/lpfc_nvmet.h
+++ b/drivers/scsi/lpfc/lpfc_nvmet.h
@@ -49,6 +49,7 @@ struct lpfc_nvmet_tgtport {
atomic_t rcv_fcp_cmd_in;
atomic_t rcv_fcp_cmd_out;
atomic_t rcv_fcp_cmd_drop;
+ atomic_t rcv_fcp_cmd_defer;
atomic_t xmt_fcp_release;
/* Stats counters - lpfc_nvmet_xmt_fcp_op */
diff --git a/include/linux/nvme-fc-driver.h b/include/linux/nvme-fc-driver.h
index 6c8c5d8041b7..2591878c1d48 100644
--- a/include/linux/nvme-fc-driver.h
+++ b/include/linux/nvme-fc-driver.h
@@ -346,6 +346,11 @@ struct nvme_fc_remote_port {
* indicating an FC transport Aborted status.
* Entrypoint is Mandatory.
*
+ * @defer_rcv: Called by the transport to signal the LLLD that it has
+ * begun processing of a previously received NVME CMD IU. The LLDD
+ * is now free to re-use the rcv buffer associated with the
+ * nvmefc_tgt_fcp_req.
+ *
* @max_hw_queues: indicates the maximum number of hw queues the LLDD
* supports for cpu affinitization.
* Value is Mandatory. Must be at least 1.
@@ -846,6 +851,8 @@ struct nvmet_fc_target_template {
struct nvmefc_tgt_fcp_req *fcpreq);
void (*fcp_req_release)(struct nvmet_fc_target_port *tgtport,
struct nvmefc_tgt_fcp_req *fcpreq);
+ void (*defer_rcv)(struct nvmet_fc_target_port *tgtport,
+ struct nvmefc_tgt_fcp_req *fcpreq);
u32 max_hw_queues;
u16 max_sgl_segments;