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RDMA: Remove the state_queues

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Since we no longer rely on the state queues for draining qpairs, we can
get rid of most of them. We cn keep just a few, and since we don't ever
remove arbitrary elements, we can use stailqs to perform those
operations. Operations on Stailqs carry about half the overhead as
operations on tailqs

Change-Id: I8f184e6269db853619a3581d387d97a795034798
Signed-off-by: Seth Howell <seth.howell@intel.com>
Reviewed-on: https://review.gerrithub.io/c/445332
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
This commit is contained in:
Seth Howell 2019-02-19 09:56:31 -07:00 committed by Jim Harris
parent 51f411c213
commit 04ebc6ea28
1 changed files with 37 additions and 25 deletions
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62
lib/nvmf/rdma.c
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@ -249,7 +249,7 @@ struct spdk_nvmf_rdma_request {
uint32_t num_outstanding_data_wr;
TAILQ_ENTRY(spdk_nvmf_rdma_request) link;
TAILQ_ENTRY(spdk_nvmf_rdma_request) state_link;
STAILQ_ENTRY(spdk_nvmf_rdma_request) state_link;
};
enum spdk_nvmf_rdma_qpair_disconnect_flags {
@ -298,8 +298,12 @@ struct spdk_nvmf_rdma_qpair {
/* Receives that are waiting for a request object */
TAILQ_HEAD(, spdk_nvmf_rdma_recv) incoming_queue;
/* Queues to track the requests in all states */
TAILQ_HEAD(, spdk_nvmf_rdma_request) state_queue[RDMA_REQUEST_NUM_STATES];
/* Queues to track requests in critical states */
STAILQ_HEAD(, spdk_nvmf_rdma_request) free_queue;
STAILQ_HEAD(, spdk_nvmf_rdma_request) pending_rdma_read_queue;
STAILQ_HEAD(, spdk_nvmf_rdma_request) pending_rdma_write_queue;
/* Number of requests in each state */
uint32_t state_cntr[RDMA_REQUEST_NUM_STATES];
@ -560,12 +564,10 @@ spdk_nvmf_rdma_request_set_state(struct spdk_nvmf_rdma_request *rdma_req,
qpair = rdma_req->req.qpair;
rqpair = SPDK_CONTAINEROF(qpair, struct spdk_nvmf_rdma_qpair, qpair);
TAILQ_REMOVE(&rqpair->state_queue[rdma_req->state], rdma_req, state_link);
rqpair->state_cntr[rdma_req->state]--;
rdma_req->state = state;
TAILQ_INSERT_TAIL(&rqpair->state_queue[rdma_req->state], rdma_req, state_link);
rqpair->state_cntr[rdma_req->state]++;
}
@ -592,12 +594,11 @@ static void
nvmf_rdma_dump_qpair_contents(struct spdk_nvmf_rdma_qpair *rqpair)
{
int i;
struct spdk_nvmf_rdma_request *req;
SPDK_ERRLOG("Dumping contents of queue pair (QID %d)\n", rqpair->qpair.qid);
for (i = 1; i < RDMA_REQUEST_NUM_STATES; i++) {
SPDK_ERRLOG("\tdumping requests in state %d\n", i);
TAILQ_FOREACH(req, &rqpair->state_queue[i], state_link) {
nvmf_rdma_dump_request(req);
for (i = 0; i < rqpair->max_queue_depth; i++) {
if (rqpair->reqs[i].state != RDMA_REQUEST_STATE_FREE) {
nvmf_rdma_dump_request(&rqpair->reqs[i]);
}
}
}
@ -782,10 +783,13 @@ spdk_nvmf_rdma_qpair_initialize(struct spdk_nvmf_qpair *qpair)
/* Initialise request state queues and counters of the queue pair */
for (i = RDMA_REQUEST_STATE_FREE; i < RDMA_REQUEST_NUM_STATES; i++) {
TAILQ_INIT(&rqpair->state_queue[i]);
rqpair->state_cntr[i] = 0;
}
STAILQ_INIT(&rqpair->free_queue);
STAILQ_INIT(&rqpair->pending_rdma_read_queue);
STAILQ_INIT(&rqpair->pending_rdma_write_queue);
rqpair->current_recv_depth = rqpair->max_queue_depth;
for (i = 0; i < rqpair->max_queue_depth; i++) {
struct ibv_recv_wr *bad_wr = NULL;
@ -858,7 +862,7 @@ spdk_nvmf_rdma_qpair_initialize(struct spdk_nvmf_qpair *qpair)
/* Initialize request state to FREE */
rdma_req->state = RDMA_REQUEST_STATE_FREE;
TAILQ_INSERT_TAIL(&rqpair->state_queue[rdma_req->state], rdma_req, state_link);
STAILQ_INSERT_HEAD(&rqpair->free_queue, rdma_req, state_link);
rqpair->state_cntr[rdma_req->state]++;
}
@ -1410,8 +1414,8 @@ nvmf_rdma_request_free(struct spdk_nvmf_rdma_request *rdma_req,
struct spdk_nvmf_rdma_qpair *rqpair;
struct spdk_nvmf_rdma_poll_group *rgroup;
rqpair = SPDK_CONTAINEROF(rdma_req->req.qpair, struct spdk_nvmf_rdma_qpair, qpair);
if (rdma_req->data_from_pool) {
rqpair = SPDK_CONTAINEROF(rdma_req->req.qpair, struct spdk_nvmf_rdma_qpair, qpair);
rgroup = rqpair->poller->group;
spdk_nvmf_rdma_request_free_buffers(rdma_req, &rgroup->group, &rtransport->transport);
@ -1420,6 +1424,7 @@ nvmf_rdma_request_free(struct spdk_nvmf_rdma_request *rdma_req,
rdma_req->req.length = 0;
rdma_req->req.iovcnt = 0;
rdma_req->req.data = NULL;
STAILQ_INSERT_HEAD(&rqpair->free_queue, rdma_req, state_link);
spdk_nvmf_rdma_request_set_state(rdma_req, RDMA_REQUEST_STATE_FREE);
}
@ -1522,6 +1527,7 @@ spdk_nvmf_rdma_request_process(struct spdk_nvmf_rdma_transport *rtransport,
* arrive using in capsule data, we need to do a transfer from the host.
*/
if (rdma_req->req.xfer == SPDK_NVME_DATA_HOST_TO_CONTROLLER && rdma_req->data_from_pool) {
STAILQ_INSERT_TAIL(&rqpair->pending_rdma_read_queue, rdma_req, state_link);
spdk_nvmf_rdma_request_set_state(rdma_req, RDMA_REQUEST_STATE_DATA_TRANSFER_TO_CONTROLLER_PENDING);
break;
}
@ -1532,8 +1538,7 @@ spdk_nvmf_rdma_request_process(struct spdk_nvmf_rdma_transport *rtransport,
spdk_trace_record(TRACE_RDMA_REQUEST_STATE_DATA_TRANSFER_TO_CONTROLLER_PENDING, 0, 0,
(uintptr_t)rdma_req, (uintptr_t)rqpair->cm_id);
if (rdma_req != TAILQ_FIRST(
&rqpair->state_queue[RDMA_REQUEST_STATE_DATA_TRANSFER_TO_CONTROLLER_PENDING])) {
if (rdma_req != STAILQ_FIRST(&rqpair->pending_rdma_read_queue)) {
/* This request needs to wait in line to perform RDMA */
break;
}
@ -1542,6 +1547,10 @@ spdk_nvmf_rdma_request_process(struct spdk_nvmf_rdma_transport *rtransport,
/* We can only have so many WRs outstanding. we have to wait until some finish. */
break;
}
/* We have already verified that this request is the head of the queue. */
STAILQ_REMOVE_HEAD(&rqpair->pending_rdma_read_queue, state_link);
rc = request_transfer_in(&rdma_req->req);
if (!rc) {
spdk_nvmf_rdma_request_set_state(rdma_req,
@ -1574,6 +1583,7 @@ spdk_nvmf_rdma_request_process(struct spdk_nvmf_rdma_transport *rtransport,
spdk_trace_record(TRACE_RDMA_REQUEST_STATE_EXECUTED, 0, 0,
(uintptr_t)rdma_req, (uintptr_t)rqpair->cm_id);
if (rdma_req->req.xfer == SPDK_NVME_DATA_CONTROLLER_TO_HOST) {
STAILQ_INSERT_TAIL(&rqpair->pending_rdma_write_queue, rdma_req, state_link);
spdk_nvmf_rdma_request_set_state(rdma_req, RDMA_REQUEST_STATE_DATA_TRANSFER_TO_HOST_PENDING);
} else {
spdk_nvmf_rdma_request_set_state(rdma_req, RDMA_REQUEST_STATE_READY_TO_COMPLETE);
@ -1583,8 +1593,7 @@ spdk_nvmf_rdma_request_process(struct spdk_nvmf_rdma_transport *rtransport,
spdk_trace_record(TRACE_RDMA_REQUEST_STATE_DATA_TRANSFER_TO_HOST_PENDING, 0, 0,
(uintptr_t)rdma_req, (uintptr_t)rqpair->cm_id);
if (rdma_req != TAILQ_FIRST(
&rqpair->state_queue[RDMA_REQUEST_STATE_DATA_TRANSFER_TO_HOST_PENDING])) {
if (rdma_req != STAILQ_FIRST(&rqpair->pending_rdma_write_queue)) {
/* This request needs to wait in line to perform RDMA */
break;
}
@ -1594,6 +1603,10 @@ spdk_nvmf_rdma_request_process(struct spdk_nvmf_rdma_transport *rtransport,
* +1 since each request has an additional wr in the resp. */
break;
}
/* We have already verified that this request is the head of the queue. */
STAILQ_REMOVE_HEAD(&rqpair->pending_rdma_write_queue, state_link);
/* The data transfer will be kicked off from
* RDMA_REQUEST_STATE_READY_TO_COMPLETE state.
*/
@ -2175,17 +2188,14 @@ spdk_nvmf_rdma_qpair_process_pending(struct spdk_nvmf_rdma_transport *rtransport
struct spdk_nvmf_rdma_request *rdma_req, *req_tmp;
/* We process I/O in the data transfer pending queue at the highest priority. RDMA reads first */
TAILQ_FOREACH_SAFE(rdma_req,
&rqpair->state_queue[RDMA_REQUEST_STATE_DATA_TRANSFER_TO_CONTROLLER_PENDING],
state_link, req_tmp) {
STAILQ_FOREACH_SAFE(rdma_req, &rqpair->pending_rdma_read_queue, state_link, req_tmp) {
if (spdk_nvmf_rdma_request_process(rtransport, rdma_req) == false && drain == false) {
break;
}
}
/* Then RDMA writes sincereads have stronger restrictions than writes */
TAILQ_FOREACH_SAFE(rdma_req, &rqpair->state_queue[RDMA_REQUEST_STATE_DATA_TRANSFER_TO_HOST_PENDING],
state_link, req_tmp) {
/* Then RDMA writes since reads have stronger restrictions than writes */
STAILQ_FOREACH_SAFE(rdma_req, &rqpair->pending_rdma_write_queue, state_link, req_tmp) {
if (spdk_nvmf_rdma_request_process(rtransport, rdma_req) == false && drain == false) {
break;
}
@ -2201,12 +2211,14 @@ spdk_nvmf_rdma_qpair_process_pending(struct spdk_nvmf_rdma_transport *rtransport
/* The lowest priority is processing newly received commands */
TAILQ_FOREACH_SAFE(rdma_recv, &rqpair->incoming_queue, link, recv_tmp) {
if (TAILQ_EMPTY(&rqpair->state_queue[RDMA_REQUEST_STATE_FREE])) {
if (STAILQ_EMPTY(&rqpair->free_queue)) {
break;
}
rdma_req = TAILQ_FIRST(&rqpair->state_queue[RDMA_REQUEST_STATE_FREE]);
rdma_req = STAILQ_FIRST(&rqpair->free_queue);
rdma_req->recv = rdma_recv;
STAILQ_REMOVE_HEAD(&rqpair->free_queue, state_link);
spdk_nvmf_rdma_request_set_state(rdma_req, RDMA_REQUEST_STATE_NEW);
if (spdk_nvmf_rdma_request_process(rtransport, rdma_req) == false) {
break;