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nvme_rdma: don't put req until both send and recv have completed

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This prevents us from overrunning the send queue.

Change-Id: I6afbd9e2ba0ff266eb8fee2ae0361ac89fad7f81
Signed-off-by: Seth Howell <seth.howell@intel.com>
Reviewed-on: https://review.gerrithub.io/c/443476
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
This commit is contained in:
Seth Howell 2019-02-05 14:07:36 -07:00 committed by Jim Harris
parent 92f5548a91
commit e7beb0d1fd
1 changed files with 22 additions and 6 deletions
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28
lib/nvme/nvme_rdma.c
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@ -141,6 +141,8 @@ struct spdk_nvme_rdma_req {
struct ibv_sge send_sgl[NVME_RDMA_DEFAULT_TX_SGE];
TAILQ_ENTRY(spdk_nvme_rdma_req) link;
bool request_ready_to_put;
};
static const char *rdma_cm_event_str[] = {
@ -198,6 +200,7 @@ nvme_rdma_req_get(struct nvme_rdma_qpair *rqpair)
static void
nvme_rdma_req_put(struct nvme_rdma_qpair *rqpair, struct spdk_nvme_rdma_req *rdma_req)
{
rdma_req->request_ready_to_put = false;
TAILQ_REMOVE(&rqpair->outstanding_reqs, rdma_req, link);
TAILQ_INSERT_HEAD(&rqpair->free_reqs, rdma_req, link);
}
@ -491,7 +494,12 @@ nvme_rdma_recv(struct nvme_rdma_qpair *rqpair, uint64_t rsp_idx)
req = rdma_req->req;
nvme_rdma_req_complete(req, rsp);
nvme_rdma_req_put(rqpair, rdma_req);
if (rdma_req->request_ready_to_put) {
nvme_rdma_req_put(rqpair, rdma_req);
} else {
rdma_req->request_ready_to_put = true;
}
if (nvme_rdma_post_recv(rqpair, rsp_idx)) {
SPDK_ERRLOG("Unable to re-post rx descriptor\n");
return -1;
@ -1644,11 +1652,12 @@ int
nvme_rdma_qpair_process_completions(struct spdk_nvme_qpair *qpair,
uint32_t max_completions)
{
struct nvme_rdma_qpair *rqpair = nvme_rdma_qpair(qpair);
struct ibv_wc wc[MAX_COMPLETIONS_PER_POLL];
int i, rc, batch_size;
uint32_t reaped;
struct ibv_cq *cq;
struct nvme_rdma_qpair *rqpair = nvme_rdma_qpair(qpair);
struct ibv_wc wc[MAX_COMPLETIONS_PER_POLL];
int i, rc, batch_size;
uint32_t reaped;
struct ibv_cq *cq;
struct spdk_nvme_rdma_req *rdma_req;
if (max_completions == 0) {
max_completions = rqpair->num_entries;
@ -1697,6 +1706,13 @@ nvme_rdma_qpair_process_completions(struct spdk_nvme_qpair *qpair,
break;
case IBV_WC_SEND:
rdma_req = (struct spdk_nvme_rdma_req *)wc[i].wr_id;
if (rdma_req->request_ready_to_put) {
nvme_rdma_req_put(rqpair, rdma_req);
} else {
rdma_req->request_ready_to_put = true;
}
break;
default: