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rdma: track outstanding data work requests directly.

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This gives us more realistic control over the number of requests we can
submit.

Change-Id: Ie717912685eaa56905c32d143c7887b636c1a9e9
Signed-off-by: Seth Howell <seth.howell@intel.com>
Reviewed-on: https://review.gerrithub.io/c/441606
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 2019-01-22 13:55:53 -07:00 committed by Jim Harris
parent 7289d370f7
commit dfdd76cf21
1 changed files with 9 additions and 8 deletions
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17
lib/nvmf/rdma.c
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@ -264,6 +264,9 @@ struct spdk_nvmf_rdma_qpair {
/* The maximum number of active RDMA READ and ATOMIC operations at one time */
uint16_t max_read_depth;
/* The current number of active RDMA READ operations */
uint16_t current_read_depth;
/* The maximum number of SGEs per WR on the send queue */
uint32_t max_send_sge;
@ -592,12 +595,6 @@ spdk_nvmf_rdma_mgmt_channel_destroy(void *io_device, void *ctx_buf)
}
}
static int
spdk_nvmf_rdma_cur_read_depth(struct spdk_nvmf_rdma_qpair *rqpair)
{
return rqpair->state_cntr[RDMA_REQUEST_STATE_TRANSFERRING_HOST_TO_CONTROLLER];
}
static int
spdk_nvmf_rdma_cur_queue_depth(struct spdk_nvmf_rdma_qpair *rqpair)
{
@ -914,6 +911,7 @@ request_transfer_in(struct spdk_nvmf_request *req)
SPDK_ERRLOG("Unable to transfer data from host to target\n");
return -1;
}
rqpair->current_read_depth += rdma_req->num_outstanding_data_wr;
return 0;
}
@ -972,9 +970,10 @@ request_transfer_out(struct spdk_nvmf_request *req, int *data_posted)
rc = ibv_post_send(rqpair->cm_id->qp, send_wr, &bad_send_wr);
if (rc) {
SPDK_ERRLOG("Unable to send response capsule\n");
return rc;
}
return rc;
return 0;
}
static int
@ -1540,7 +1539,7 @@ spdk_nvmf_rdma_request_process(struct spdk_nvmf_rdma_transport *rtransport,
if (rdma_req->req.xfer == SPDK_NVME_DATA_HOST_TO_CONTROLLER) {
if (spdk_nvmf_rdma_cur_read_depth(rqpair) >= rqpair->max_read_depth) {
if (rqpair->current_read_depth >= rqpair->max_read_depth) {
/* Read operation queue is full, need to wait */
break;
}
@ -2728,6 +2727,7 @@ spdk_nvmf_rdma_poller_poll(struct spdk_nvmf_rdma_transport *rtransport,
SPDK_ERRLOG("data=%p length=%u\n", rdma_req->req.data, rdma_req->req.length);
if (rdma_req->data.wr.opcode == IBV_WR_RDMA_READ) {
assert(rdma_req->num_outstanding_data_wr > 0);
rqpair->current_read_depth--;
rdma_req->num_outstanding_data_wr--;
if (rdma_req->num_outstanding_data_wr == 0) {
spdk_nvmf_rdma_request_set_state(rdma_req, RDMA_REQUEST_STATE_COMPLETED);
@ -2802,6 +2802,7 @@ spdk_nvmf_rdma_poller_poll(struct spdk_nvmf_rdma_transport *rtransport,
assert(rdma_req->state == RDMA_REQUEST_STATE_TRANSFERRING_HOST_TO_CONTROLLER);
/* wait for all outstanding reads associated with the same rdma_req to complete before proceeding. */
assert(rdma_req->num_outstanding_data_wr > 0);
rqpair->current_read_depth--;
rdma_req->num_outstanding_data_wr--;
if (rdma_req->num_outstanding_data_wr == 0) {
spdk_nvmf_rdma_request_set_state(rdma_req, RDMA_REQUEST_STATE_READY_TO_EXECUTE);