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nvmf: Calculate queue_depth separately from rw_depth

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Read/Write depth is much lower than Send/Recv depth.
Calculate them separately to prepare for supporting
a larger number of receives than read/writes.

Currently, the target still only exposes a queue depth
equal to the read/write depth.

Change-Id: I08a7434d4ace8d696ae7e1eee241047004de7cc5
Signed-off-by: Ben Walker <benjamin.walker@intel.com>
This commit is contained in:
Ben Walker 2016-07-25 14:36:06 -07:00
parent 756df04485
commit ca0c13387a
1 changed files with 28 additions and 14 deletions
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42
lib/nvmf/rdma.c
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@ -82,8 +82,14 @@ struct spdk_nvmf_rdma_conn {
struct ibv_cq *cq;
struct ibv_qp *qp;
/* The maximum number of I/O outstanding on this connection at one time */
uint16_t queue_depth;
int outstanding_reqs;
/* The maximum number of active RDMA READ and WRITE operations at one time */
uint16_t rw_depth;
/* The current number of I/O outstanding on this connection */
int num_outstanding_reqs;
/* Array of size "queue_depth" containing RDMA requests. */
struct spdk_nvmf_rdma_request *reqs;
@ -180,7 +186,7 @@ spdk_nvmf_rdma_conn_destroy(struct spdk_nvmf_rdma_conn *rdma_conn)
}
static struct spdk_nvmf_rdma_conn *
spdk_nvmf_rdma_conn_create(struct rdma_cm_id *id, uint16_t queue_depth)
spdk_nvmf_rdma_conn_create(struct rdma_cm_id *id, uint16_t queue_depth, uint16_t rw_depth)
{
struct spdk_nvmf_rdma_conn *rdma_conn;
struct spdk_nvmf_conn *conn;
@ -195,6 +201,7 @@ spdk_nvmf_rdma_conn_create(struct rdma_cm_id *id, uint16_t queue_depth)
}
rdma_conn->queue_depth = queue_depth;
rdma_conn->rw_depth = rw_depth;
rdma_conn->ctx = id->verbs;
rdma_conn->cm_id = id;
@ -508,6 +515,7 @@ nvmf_rdma_connect(struct rdma_cm_event *event)
struct spdk_nvmf_rdma_accept_private_data accept_data;
uint16_t sts = 0;
uint16_t queue_depth;
uint16_t rw_depth;
int rc;
@ -532,6 +540,7 @@ nvmf_rdma_connect(struct rdma_cm_event *event)
/* Start with the maximum queue depth allowed by the target */
queue_depth = g_rdma.max_queue_depth;
rw_depth = g_rdma.max_queue_depth;
SPDK_TRACELOG(SPDK_TRACE_RDMA, "Target Max Queue Depth: %d\n", g_rdma.max_queue_depth);
/* Next check the local NIC's hardware limitations */
@ -544,14 +553,15 @@ nvmf_rdma_connect(struct rdma_cm_event *event)
SPDK_TRACELOG(SPDK_TRACE_RDMA,
"Local NIC Max Send/Recv Queue Depth: %d Max Read/Write Queue Depth: %d\n",
ibdev_attr.max_qp_wr, ibdev_attr.max_qp_rd_atom);
queue_depth = nvmf_min(queue_depth, ibdev_attr.max_qp_rd_atom);
queue_depth = nvmf_min(queue_depth, ibdev_attr.max_qp_rd_atom);
queue_depth = nvmf_min(queue_depth, ibdev_attr.max_qp_wr);
rw_depth = nvmf_min(rw_depth, ibdev_attr.max_qp_rd_atom);
/* Next check the remote NIC's hardware limitations */
rdma_param = &event->param.conn;
queue_depth = nvmf_min(queue_depth, rdma_param->initiator_depth);
SPDK_TRACELOG(SPDK_TRACE_RDMA, "Host NIC Max Read/Write Queue Depth: %d\n",
rdma_param->initiator_depth);
SPDK_TRACELOG(SPDK_TRACE_RDMA,
"Host NIC Max Incoming RDMA R/W operations: %d Max Outgoing RDMA R/W operations: %d\n",
rdma_param->initiator_depth, rdma_param->responder_resources);
rw_depth = nvmf_min(rw_depth, rdma_param->initiator_depth);
/* Finally check for the host software requested values, which are
* optional. */
@ -564,10 +574,14 @@ nvmf_rdma_connect(struct rdma_cm_event *event)
queue_depth = nvmf_min(queue_depth, private_data->hsqsize);
}
SPDK_TRACELOG(SPDK_TRACE_RDMA, "Final Negotiated Queue Depth: %d\n", queue_depth);
SPDK_TRACELOG(SPDK_TRACE_RDMA, "Final Negotiated Queue Depth: %d R/W Depth: %d\n",
queue_depth, rw_depth);
/* TEMPORARY: Limit the queue_depth to the rw_depth due to lack of queueing */
queue_depth = rw_depth;
/* Init the NVMf rdma transport connection */
rdma_conn = spdk_nvmf_rdma_conn_create(event->id, queue_depth);
rdma_conn = spdk_nvmf_rdma_conn_create(event->id, queue_depth, rw_depth);
if (rdma_conn == NULL) {
SPDK_ERRLOG("Error on nvmf connection creation\n");
goto err1;
@ -1048,11 +1062,11 @@ spdk_nvmf_rdma_poll(struct spdk_nvmf_conn *conn)
switch (wc.opcode) {
case IBV_WC_SEND:
assert(rdma_conn->outstanding_reqs > 0);
rdma_conn->outstanding_reqs--;
assert(rdma_conn->num_outstanding_reqs > 0);
rdma_conn->num_outstanding_reqs--;
SPDK_TRACELOG(SPDK_TRACE_RDMA,
"RDMA SEND Complete. Request: %p Connection: %p Outstanding I/O: %d\n",
req, conn, rdma_conn->outstanding_reqs);
req, conn, rdma_conn->num_outstanding_reqs);
if (spdk_nvmf_rdma_request_release(req)) {
return -1;
}
@ -1086,10 +1100,10 @@ spdk_nvmf_rdma_poll(struct spdk_nvmf_conn *conn)
return -1;
}
rdma_conn->outstanding_reqs++;
rdma_conn->num_outstanding_reqs++;
SPDK_TRACELOG(SPDK_TRACE_RDMA,
"RDMA RECV Complete. Request: %p Connection: %p Outstanding I/O: %d\n",
req, conn, rdma_conn->outstanding_reqs);
req, conn, rdma_conn->num_outstanding_reqs);
spdk_trace_record(TRACE_NVMF_IO_START, 0, 0, (uint64_t)req, 0);
memset(req->rsp, 0, sizeof(*req->rsp));