[PATCH 7/8] nvme-tcp-offload: Add queue level implementation
Shai Malin
smalin at marvell.com
Wed Jun 2 11:42:45 PDT 2021
From: Dean Balandin <dbalandin at marvell.com>
In this patch we implement queue level functionality.
The implementation is similar to the nvme-tcp module, the main
difference being that we call the vendor specific create_queue op which
creates the TCP connection, and NVMeTPC connection including
icreq+icresp negotiation.
Once create_queue returns successfully, we can move on to the fabrics
connect.
Acked-by: Igor Russkikh <irusskikh at marvell.com>
Signed-off-by: Dean Balandin <dbalandin at marvell.com>
Signed-off-by: Prabhakar Kushwaha <pkushwaha at marvell.com>
Signed-off-by: Omkar Kulkarni <okulkarni at marvell.com>
Signed-off-by: Michal Kalderon <mkalderon at marvell.com>
Signed-off-by: Ariel Elior <aelior at marvell.com>
Signed-off-by: Shai Malin <smalin at marvell.com>
Reviewed-by: Himanshu Madhani <himanshu.madhani at oracle.com>
---
drivers/nvme/host/tcp-offload.c | 417 +++++++++++++++++++++++++++++---
drivers/nvme/host/tcp-offload.h | 4 +
2 files changed, 393 insertions(+), 28 deletions(-)
diff --git a/drivers/nvme/host/tcp-offload.c b/drivers/nvme/host/tcp-offload.c
index 97c1fd33adb9..1700cdf42433 100644
--- a/drivers/nvme/host/tcp-offload.c
+++ b/drivers/nvme/host/tcp-offload.c
@@ -22,6 +22,11 @@ static inline struct nvme_tcp_ofld_ctrl *to_tcp_ofld_ctrl(struct nvme_ctrl *nctr
return container_of(nctrl, struct nvme_tcp_ofld_ctrl, nctrl);
}
+static inline int nvme_tcp_ofld_qid(struct nvme_tcp_ofld_queue *queue)
+{
+ return queue - queue->ctrl->queues;
+}
+
/**
* nvme_tcp_ofld_register_dev() - NVMeTCP Offload Library registration
* function.
@@ -182,19 +187,124 @@ nvme_tcp_ofld_alloc_tagset(struct nvme_ctrl *nctrl, bool admin)
return set;
}
+static void __nvme_tcp_ofld_stop_queue(struct nvme_tcp_ofld_queue *queue)
+{
+ queue->dev->ops->drain_queue(queue);
+}
+
+static void nvme_tcp_ofld_stop_queue(struct nvme_ctrl *nctrl, int qid)
+{
+ struct nvme_tcp_ofld_ctrl *ctrl = to_tcp_ofld_ctrl(nctrl);
+ struct nvme_tcp_ofld_queue *queue = &ctrl->queues[qid];
+
+ mutex_lock(&queue->queue_lock);
+ if (test_and_clear_bit(NVME_TCP_OFLD_Q_LIVE, &queue->flags))
+ __nvme_tcp_ofld_stop_queue(queue);
+ mutex_unlock(&queue->queue_lock);
+}
+
+static void nvme_tcp_ofld_stop_io_queues(struct nvme_ctrl *ctrl)
+{
+ int i;
+
+ for (i = 1; i < ctrl->queue_count; i++)
+ nvme_tcp_ofld_stop_queue(ctrl, i);
+}
+
+static void __nvme_tcp_ofld_free_queue(struct nvme_tcp_ofld_queue *queue)
+{
+ queue->dev->ops->destroy_queue(queue);
+}
+
+static void nvme_tcp_ofld_free_queue(struct nvme_ctrl *nctrl, int qid)
+{
+ struct nvme_tcp_ofld_ctrl *ctrl = to_tcp_ofld_ctrl(nctrl);
+ struct nvme_tcp_ofld_queue *queue = &ctrl->queues[qid];
+
+ if (test_and_clear_bit(NVME_TCP_OFLD_Q_ALLOCATED, &queue->flags)) {
+ __nvme_tcp_ofld_free_queue(queue);
+ mutex_destroy(&queue->queue_lock);
+ }
+}
+
+static void
+nvme_tcp_ofld_free_io_queues(struct nvme_ctrl *nctrl)
+{
+ int i;
+
+ for (i = 1; i < nctrl->queue_count; i++)
+ nvme_tcp_ofld_free_queue(nctrl, i);
+}
+
+static void nvme_tcp_ofld_destroy_io_queues(struct nvme_ctrl *nctrl, bool remove)
+{
+ nvme_tcp_ofld_stop_io_queues(nctrl);
+ if (remove) {
+ blk_cleanup_queue(nctrl->connect_q);
+ blk_mq_free_tag_set(nctrl->tagset);
+ }
+ nvme_tcp_ofld_free_io_queues(nctrl);
+}
+
+static void nvme_tcp_ofld_destroy_admin_queue(struct nvme_ctrl *nctrl, bool remove)
+{
+ nvme_tcp_ofld_stop_queue(nctrl, 0);
+ if (remove) {
+ blk_cleanup_queue(nctrl->admin_q);
+ blk_cleanup_queue(nctrl->fabrics_q);
+ blk_mq_free_tag_set(nctrl->admin_tagset);
+ }
+ nvme_tcp_ofld_free_queue(nctrl, 0);
+}
+
+static int nvme_tcp_ofld_start_queue(struct nvme_ctrl *nctrl, int qid)
+{
+ struct nvme_tcp_ofld_ctrl *ctrl = to_tcp_ofld_ctrl(nctrl);
+ struct nvme_tcp_ofld_queue *queue = &ctrl->queues[qid];
+ int rc;
+
+ queue = &ctrl->queues[qid];
+ if (qid) {
+ queue->cmnd_capsule_len = nctrl->ioccsz * 16;
+ rc = nvmf_connect_io_queue(nctrl, qid, false);
+ } else {
+ queue->cmnd_capsule_len = sizeof(struct nvme_command) + NVME_TCP_ADMIN_CCSZ;
+ rc = nvmf_connect_admin_queue(nctrl);
+ }
+
+ if (!rc) {
+ set_bit(NVME_TCP_OFLD_Q_LIVE, &queue->flags);
+ } else {
+ if (test_bit(NVME_TCP_OFLD_Q_ALLOCATED, &queue->flags))
+ __nvme_tcp_ofld_stop_queue(queue);
+ dev_err(nctrl->device,
+ "failed to connect queue: %d ret=%d\n", qid, rc);
+ }
+
+ return rc;
+}
+
static int nvme_tcp_ofld_configure_admin_queue(struct nvme_ctrl *nctrl,
bool new)
{
+ struct nvme_tcp_ofld_ctrl *ctrl = to_tcp_ofld_ctrl(nctrl);
+ struct nvme_tcp_ofld_queue *queue = &ctrl->queues[0];
int rc;
- /* Placeholder - alloc_admin_queue */
+ mutex_init(&queue->queue_lock);
+
+ rc = ctrl->dev->ops->create_queue(queue, 0, NVME_AQ_DEPTH);
+ if (rc)
+ return rc;
+
+ set_bit(NVME_TCP_OFLD_Q_ALLOCATED, &queue->flags);
if (new) {
nctrl->admin_tagset =
nvme_tcp_ofld_alloc_tagset(nctrl, true);
if (IS_ERR(nctrl->admin_tagset)) {
rc = PTR_ERR(nctrl->admin_tagset);
nctrl->admin_tagset = NULL;
- goto out_destroy_queue;
+ goto out_free_queue;
}
nctrl->fabrics_q = blk_mq_init_queue(nctrl->admin_tagset);
@@ -212,7 +322,9 @@ static int nvme_tcp_ofld_configure_admin_queue(struct nvme_ctrl *nctrl,
}
}
- /* Placeholder - nvme_tcp_ofld_start_queue */
+ rc = nvme_tcp_ofld_start_queue(nctrl, 0);
+ if (rc)
+ goto out_cleanup_queue;
rc = nvme_enable_ctrl(nctrl);
if (rc)
@@ -229,19 +341,143 @@ static int nvme_tcp_ofld_configure_admin_queue(struct nvme_ctrl *nctrl,
out_quiesce_queue:
blk_mq_quiesce_queue(nctrl->admin_q);
blk_sync_queue(nctrl->admin_q);
-
out_stop_queue:
- /* Placeholder - stop offload queue */
+ nvme_tcp_ofld_stop_queue(nctrl, 0);
nvme_cancel_admin_tagset(nctrl);
-
+out_cleanup_queue:
+ if (new)
+ blk_cleanup_queue(nctrl->admin_q);
out_cleanup_fabrics_q:
if (new)
blk_cleanup_queue(nctrl->fabrics_q);
out_free_tagset:
if (new)
blk_mq_free_tag_set(nctrl->admin_tagset);
-out_destroy_queue:
- /* Placeholder - free admin queue */
+out_free_queue:
+ nvme_tcp_ofld_free_queue(nctrl, 0);
+
+ return rc;
+}
+
+static unsigned int nvme_tcp_ofld_nr_io_queues(struct nvme_ctrl *nctrl)
+{
+ struct nvme_tcp_ofld_ctrl *ctrl = to_tcp_ofld_ctrl(nctrl);
+ struct nvme_tcp_ofld_dev *dev = ctrl->dev;
+ u32 hw_vectors = dev->num_hw_vectors;
+ u32 nr_write_queues, nr_poll_queues;
+ u32 nr_io_queues, nr_total_queues;
+
+ nr_io_queues = min3(nctrl->opts->nr_io_queues, num_online_cpus(),
+ hw_vectors);
+ nr_write_queues = min3(nctrl->opts->nr_write_queues, num_online_cpus(),
+ hw_vectors);
+ nr_poll_queues = min3(nctrl->opts->nr_poll_queues, num_online_cpus(),
+ hw_vectors);
+
+ nr_total_queues = nr_io_queues + nr_write_queues + nr_poll_queues;
+
+ return nr_total_queues;
+}
+
+static void
+nvme_tcp_ofld_set_io_queues(struct nvme_ctrl *nctrl, unsigned int nr_io_queues)
+{
+ struct nvme_tcp_ofld_ctrl *ctrl = to_tcp_ofld_ctrl(nctrl);
+ struct nvmf_ctrl_options *opts = nctrl->opts;
+
+ if (opts->nr_write_queues && opts->nr_io_queues < nr_io_queues) {
+ /*
+ * separate read/write queues
+ * hand out dedicated default queues only after we have
+ * sufficient read queues.
+ */
+ ctrl->io_queues[HCTX_TYPE_READ] = opts->nr_io_queues;
+ nr_io_queues -= ctrl->io_queues[HCTX_TYPE_READ];
+ ctrl->io_queues[HCTX_TYPE_DEFAULT] =
+ min(opts->nr_write_queues, nr_io_queues);
+ nr_io_queues -= ctrl->io_queues[HCTX_TYPE_DEFAULT];
+ } else {
+ /*
+ * shared read/write queues
+ * either no write queues were requested, or we don't have
+ * sufficient queue count to have dedicated default queues.
+ */
+ ctrl->io_queues[HCTX_TYPE_DEFAULT] =
+ min(opts->nr_io_queues, nr_io_queues);
+ nr_io_queues -= ctrl->io_queues[HCTX_TYPE_DEFAULT];
+ }
+
+ if (opts->nr_poll_queues && nr_io_queues) {
+ /* map dedicated poll queues only if we have queues left */
+ ctrl->io_queues[HCTX_TYPE_POLL] =
+ min(opts->nr_poll_queues, nr_io_queues);
+ }
+}
+
+static int nvme_tcp_ofld_create_io_queues(struct nvme_ctrl *nctrl)
+{
+ struct nvme_tcp_ofld_ctrl *ctrl = to_tcp_ofld_ctrl(nctrl);
+ int i, rc;
+
+ for (i = 1; i < nctrl->queue_count; i++) {
+ mutex_init(&ctrl->queues[i].queue_lock);
+
+ rc = ctrl->dev->ops->create_queue(&ctrl->queues[i],
+ i, nctrl->sqsize + 1);
+ if (rc)
+ goto out_free_queues;
+
+ set_bit(NVME_TCP_OFLD_Q_ALLOCATED, &ctrl->queues[i].flags);
+ }
+
+ return 0;
+
+out_free_queues:
+ for (i--; i >= 1; i--)
+ nvme_tcp_ofld_free_queue(nctrl, i);
+
+ return rc;
+}
+
+static int nvme_tcp_ofld_alloc_io_queues(struct nvme_ctrl *nctrl)
+{
+ unsigned int nr_io_queues;
+ int rc;
+
+ nr_io_queues = nvme_tcp_ofld_nr_io_queues(nctrl);
+ rc = nvme_set_queue_count(nctrl, &nr_io_queues);
+ if (rc)
+ return rc;
+
+ nctrl->queue_count = nr_io_queues + 1;
+ if (nctrl->queue_count < 2) {
+ dev_err(nctrl->device,
+ "unable to set any I/O queues\n");
+
+ return -ENOMEM;
+ }
+
+ dev_info(nctrl->device, "creating %d I/O queues.\n", nr_io_queues);
+ nvme_tcp_ofld_set_io_queues(nctrl, nr_io_queues);
+
+ return nvme_tcp_ofld_create_io_queues(nctrl);
+}
+
+static int nvme_tcp_ofld_start_io_queues(struct nvme_ctrl *nctrl)
+{
+ int i, rc = 0;
+
+ for (i = 1; i < nctrl->queue_count; i++) {
+ rc = nvme_tcp_ofld_start_queue(nctrl, i);
+ if (rc)
+ goto out_stop_queues;
+ }
+
+ return 0;
+
+out_stop_queues:
+ for (i--; i >= 1; i--)
+ nvme_tcp_ofld_stop_queue(nctrl, i);
return rc;
}
@@ -249,9 +485,10 @@ static int nvme_tcp_ofld_configure_admin_queue(struct nvme_ctrl *nctrl,
static int
nvme_tcp_ofld_configure_io_queues(struct nvme_ctrl *nctrl, bool new)
{
- int rc;
+ int rc = nvme_tcp_ofld_alloc_io_queues(nctrl);
- /* Placeholder - alloc_io_queues */
+ if (rc)
+ return rc;
if (new) {
nctrl->tagset = nvme_tcp_ofld_alloc_tagset(nctrl, false);
@@ -269,7 +506,9 @@ nvme_tcp_ofld_configure_io_queues(struct nvme_ctrl *nctrl, bool new)
}
}
- /* Placeholder - start_io_queues */
+ rc = nvme_tcp_ofld_start_io_queues(nctrl);
+ if (rc)
+ goto out_cleanup_connect_q;
if (!new) {
nvme_start_queues(nctrl);
@@ -291,16 +530,16 @@ nvme_tcp_ofld_configure_io_queues(struct nvme_ctrl *nctrl, bool new)
out_wait_freeze_timed_out:
nvme_stop_queues(nctrl);
nvme_sync_io_queues(nctrl);
-
- /* Placeholder - Stop IO queues */
-
+ nvme_tcp_ofld_stop_io_queues(nctrl);
+out_cleanup_connect_q:
+ nvme_cancel_tagset(nctrl);
if (new)
blk_cleanup_queue(nctrl->connect_q);
out_free_tag_set:
if (new)
blk_mq_free_tag_set(nctrl->tagset);
out_free_io_queues:
- /* Placeholder - free_io_queues */
+ nvme_tcp_ofld_free_io_queues(nctrl);
return rc;
}
@@ -327,6 +566,17 @@ static void nvme_tcp_ofld_reconnect_or_remove(struct nvme_ctrl *nctrl)
}
}
+static int
+nvme_tcp_ofld_init_admin_hctx(struct blk_mq_hw_ctx *hctx, void *data,
+ unsigned int hctx_idx)
+{
+ struct nvme_tcp_ofld_ctrl *ctrl = data;
+
+ hctx->driver_data = &ctrl->queues[0];
+
+ return 0;
+}
+
static int nvme_tcp_ofld_setup_ctrl(struct nvme_ctrl *nctrl, bool new)
{
struct nvme_tcp_ofld_ctrl *ctrl = to_tcp_ofld_ctrl(nctrl);
@@ -388,9 +638,19 @@ static int nvme_tcp_ofld_setup_ctrl(struct nvme_ctrl *nctrl, bool new)
return 0;
destroy_io:
- /* Placeholder - stop and destroy io queues*/
+ if (nctrl->queue_count > 1) {
+ nvme_stop_queues(nctrl);
+ nvme_sync_io_queues(nctrl);
+ nvme_tcp_ofld_stop_io_queues(nctrl);
+ nvme_cancel_tagset(nctrl);
+ nvme_tcp_ofld_destroy_io_queues(nctrl, new);
+ }
destroy_admin:
- /* Placeholder - stop and destroy admin queue*/
+ blk_mq_quiesce_queue(nctrl->admin_q);
+ blk_sync_queue(nctrl->admin_q);
+ nvme_tcp_ofld_stop_queue(nctrl, 0);
+ nvme_cancel_admin_tagset(nctrl);
+ nvme_tcp_ofld_destroy_admin_queue(nctrl, new);
out_release_ctrl:
ctrl->dev->ops->release_ctrl(ctrl);
@@ -439,15 +699,37 @@ static void nvme_tcp_ofld_free_ctrl(struct nvme_ctrl *nctrl)
}
static void
-nvme_tcp_ofld_teardown_admin_queue(struct nvme_ctrl *ctrl, bool remove)
+nvme_tcp_ofld_teardown_admin_queue(struct nvme_ctrl *nctrl, bool remove)
{
- /* Placeholder - teardown_admin_queue */
+ blk_mq_quiesce_queue(nctrl->admin_q);
+ blk_sync_queue(nctrl->admin_q);
+
+ nvme_tcp_ofld_stop_queue(nctrl, 0);
+ nvme_cancel_admin_tagset(nctrl);
+
+ if (remove)
+ blk_mq_unquiesce_queue(nctrl->admin_q);
+
+ nvme_tcp_ofld_destroy_admin_queue(nctrl, remove);
}
static void
nvme_tcp_ofld_teardown_io_queues(struct nvme_ctrl *nctrl, bool remove)
{
- /* Placeholder - teardown_io_queues */
+ if (nctrl->queue_count <= 1)
+ return;
+
+ blk_mq_quiesce_queue(nctrl->admin_q);
+ nvme_start_freeze(nctrl);
+ nvme_stop_queues(nctrl);
+ nvme_sync_io_queues(nctrl);
+ nvme_tcp_ofld_stop_io_queues(nctrl);
+ nvme_cancel_tagset(nctrl);
+
+ if (remove)
+ nvme_start_queues(nctrl);
+
+ nvme_tcp_ofld_destroy_io_queues(nctrl, remove);
}
static void nvme_tcp_ofld_reconnect_ctrl_work(struct work_struct *work)
@@ -562,6 +844,12 @@ nvme_tcp_ofld_init_request(struct blk_mq_tag_set *set,
return 0;
}
+inline size_t nvme_tcp_ofld_inline_data_size(struct nvme_tcp_ofld_queue *queue)
+{
+ return queue->cmnd_capsule_len - sizeof(struct nvme_command);
+}
+EXPORT_SYMBOL_GPL(nvme_tcp_ofld_inline_data_size);
+
static blk_status_t
nvme_tcp_ofld_queue_rq(struct blk_mq_hw_ctx *hctx,
const struct blk_mq_queue_data *bd)
@@ -573,22 +861,95 @@ nvme_tcp_ofld_queue_rq(struct blk_mq_hw_ctx *hctx,
return BLK_STS_OK;
}
+static void
+nvme_tcp_ofld_exit_request(struct blk_mq_tag_set *set,
+ struct request *rq, unsigned int hctx_idx)
+{
+ /*
+ * Nothing is allocated in nvme_tcp_ofld_init_request,
+ * hence empty.
+ */
+}
+
+static int
+nvme_tcp_ofld_init_hctx(struct blk_mq_hw_ctx *hctx, void *data,
+ unsigned int hctx_idx)
+{
+ struct nvme_tcp_ofld_ctrl *ctrl = data;
+
+ hctx->driver_data = &ctrl->queues[hctx_idx + 1];
+
+ return 0;
+}
+
+static int nvme_tcp_ofld_map_queues(struct blk_mq_tag_set *set)
+{
+ struct nvme_tcp_ofld_ctrl *ctrl = set->driver_data;
+ struct nvmf_ctrl_options *opts = ctrl->nctrl.opts;
+
+ if (opts->nr_write_queues && ctrl->io_queues[HCTX_TYPE_READ]) {
+ /* separate read/write queues */
+ set->map[HCTX_TYPE_DEFAULT].nr_queues =
+ ctrl->io_queues[HCTX_TYPE_DEFAULT];
+ set->map[HCTX_TYPE_DEFAULT].queue_offset = 0;
+ set->map[HCTX_TYPE_READ].nr_queues =
+ ctrl->io_queues[HCTX_TYPE_READ];
+ set->map[HCTX_TYPE_READ].queue_offset =
+ ctrl->io_queues[HCTX_TYPE_DEFAULT];
+ } else {
+ /* shared read/write queues */
+ set->map[HCTX_TYPE_DEFAULT].nr_queues =
+ ctrl->io_queues[HCTX_TYPE_DEFAULT];
+ set->map[HCTX_TYPE_DEFAULT].queue_offset = 0;
+ set->map[HCTX_TYPE_READ].nr_queues =
+ ctrl->io_queues[HCTX_TYPE_DEFAULT];
+ set->map[HCTX_TYPE_READ].queue_offset = 0;
+ }
+ blk_mq_map_queues(&set->map[HCTX_TYPE_DEFAULT]);
+ blk_mq_map_queues(&set->map[HCTX_TYPE_READ]);
+
+ if (opts->nr_poll_queues && ctrl->io_queues[HCTX_TYPE_POLL]) {
+ /* map dedicated poll queues only if we have queues left */
+ set->map[HCTX_TYPE_POLL].nr_queues =
+ ctrl->io_queues[HCTX_TYPE_POLL];
+ set->map[HCTX_TYPE_POLL].queue_offset =
+ ctrl->io_queues[HCTX_TYPE_DEFAULT] +
+ ctrl->io_queues[HCTX_TYPE_READ];
+ blk_mq_map_queues(&set->map[HCTX_TYPE_POLL]);
+ }
+
+ dev_info(ctrl->nctrl.device,
+ "mapped %d/%d/%d default/read/poll queues.\n",
+ ctrl->io_queues[HCTX_TYPE_DEFAULT],
+ ctrl->io_queues[HCTX_TYPE_READ],
+ ctrl->io_queues[HCTX_TYPE_POLL]);
+
+ return 0;
+}
+
+static int nvme_tcp_ofld_poll(struct blk_mq_hw_ctx *hctx)
+{
+ /* Placeholder - Implement polling mechanism */
+
+ return 0;
+}
+
static struct blk_mq_ops nvme_tcp_ofld_mq_ops = {
.queue_rq = nvme_tcp_ofld_queue_rq,
+ .complete = nvme_complete_rq,
.init_request = nvme_tcp_ofld_init_request,
- /*
- * All additional ops will be also implemented and registered similar to
- * tcp.c
- */
+ .exit_request = nvme_tcp_ofld_exit_request,
+ .init_hctx = nvme_tcp_ofld_init_hctx,
+ .map_queues = nvme_tcp_ofld_map_queues,
+ .poll = nvme_tcp_ofld_poll,
};
static struct blk_mq_ops nvme_tcp_ofld_admin_mq_ops = {
.queue_rq = nvme_tcp_ofld_queue_rq,
+ .complete = nvme_complete_rq,
.init_request = nvme_tcp_ofld_init_request,
- /*
- * All additional ops will be also implemented and registered similar to
- * tcp.c
- */
+ .exit_request = nvme_tcp_ofld_exit_request,
+ .init_hctx = nvme_tcp_ofld_init_admin_hctx,
};
static const struct nvme_ctrl_ops nvme_tcp_ofld_ctrl_ops = {
diff --git a/drivers/nvme/host/tcp-offload.h b/drivers/nvme/host/tcp-offload.h
index 4281d1dacc94..875fcd3ec04a 100644
--- a/drivers/nvme/host/tcp-offload.h
+++ b/drivers/nvme/host/tcp-offload.h
@@ -65,6 +65,9 @@ struct nvme_tcp_ofld_queue {
unsigned long flags;
size_t cmnd_capsule_len;
+ /* mutex used during stop_queue */
+ struct mutex queue_lock;
+
u8 hdr_digest;
u8 data_digest;
u8 tos;
@@ -198,3 +201,4 @@ struct nvme_tcp_ofld_ops {
int nvme_tcp_ofld_register_dev(struct nvme_tcp_ofld_dev *dev);
void nvme_tcp_ofld_unregister_dev(struct nvme_tcp_ofld_dev *dev);
void nvme_tcp_ofld_error_recovery(struct nvme_ctrl *nctrl);
+inline size_t nvme_tcp_ofld_inline_data_size(struct nvme_tcp_ofld_queue *queue);
--
2.22.0
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