diff options
Diffstat (limited to 'drivers/nvme/host/rdma.c')
| -rw-r--r-- | drivers/nvme/host/rdma.c | 48 |
1 files changed, 29 insertions, 19 deletions
diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c index 3d25add36d91..ab4f8db2a8ca 100644 --- a/drivers/nvme/host/rdma.c +++ b/drivers/nvme/host/rdma.c @@ -88,7 +88,7 @@ enum nvme_rdma_queue_flags { struct nvme_rdma_queue { struct nvme_rdma_qe *rsp_ring; - u8 sig_count; + atomic_t sig_count; int queue_size; size_t cmnd_capsule_len; struct nvme_rdma_ctrl *ctrl; @@ -337,8 +337,6 @@ static int __nvme_rdma_init_request(struct nvme_rdma_ctrl *ctrl, struct ib_device *ibdev = dev->dev; int ret; - BUG_ON(queue_idx >= ctrl->queue_count); - ret = nvme_rdma_alloc_qe(ibdev, &req->sqe, sizeof(struct nvme_command), DMA_TO_DEVICE); if (ret) @@ -555,6 +553,7 @@ static int nvme_rdma_init_queue(struct nvme_rdma_ctrl *ctrl, queue->cmnd_capsule_len = sizeof(struct nvme_command); queue->queue_size = queue_size; + atomic_set(&queue->sig_count, 0); queue->cm_id = rdma_create_id(&init_net, nvme_rdma_cm_handler, queue, RDMA_PS_TCP, IB_QPT_RC); @@ -642,8 +641,22 @@ out_free_queues: static int nvme_rdma_init_io_queues(struct nvme_rdma_ctrl *ctrl) { + struct nvmf_ctrl_options *opts = ctrl->ctrl.opts; + unsigned int nr_io_queues; int i, ret; + nr_io_queues = min(opts->nr_io_queues, num_online_cpus()); + ret = nvme_set_queue_count(&ctrl->ctrl, &nr_io_queues); + if (ret) + return ret; + + ctrl->queue_count = nr_io_queues + 1; + if (ctrl->queue_count < 2) + return 0; + + dev_info(ctrl->ctrl.device, + "creating %d I/O queues.\n", nr_io_queues); + for (i = 1; i < ctrl->queue_count; i++) { ret = nvme_rdma_init_queue(ctrl, i, ctrl->ctrl.opts->queue_size); @@ -1011,6 +1024,18 @@ static void nvme_rdma_send_done(struct ib_cq *cq, struct ib_wc *wc) nvme_rdma_wr_error(cq, wc, "SEND"); } +/* + * We want to signal completion at least every queue depth/2. This returns the + * largest power of two that is not above half of (queue size + 1) to optimize + * (avoid divisions). + */ +static inline bool nvme_rdma_queue_sig_limit(struct nvme_rdma_queue *queue) +{ + int limit = 1 << ilog2((queue->queue_size + 1) / 2); + + return (atomic_inc_return(&queue->sig_count) & (limit - 1)) == 0; +} + static int nvme_rdma_post_send(struct nvme_rdma_queue *queue, struct nvme_rdma_qe *qe, struct ib_sge *sge, u32 num_sge, struct ib_send_wr *first, bool flush) @@ -1038,9 +1063,6 @@ static int nvme_rdma_post_send(struct nvme_rdma_queue *queue, * Would have been way to obvious to handle this in hardware or * at least the RDMA stack.. * - * This messy and racy code sniplet is copy and pasted from the iSER - * initiator, and the magic '32' comes from there as well. - * * Always signal the flushes. The magic request used for the flush * sequencer is not allocated in our driver's tagset and it's * triggered to be freed by blk_cleanup_queue(). So we need to @@ -1048,7 +1070,7 @@ static int nvme_rdma_post_send(struct nvme_rdma_queue *queue, * embeded in request's payload, is not freed when __ib_process_cq() * calls wr_cqe->done(). */ - if ((++queue->sig_count % 32) == 0 || flush) + if (nvme_rdma_queue_sig_limit(queue) || flush) wr.send_flags |= IB_SEND_SIGNALED; if (first) @@ -1785,20 +1807,8 @@ static const struct nvme_ctrl_ops nvme_rdma_ctrl_ops = { static int nvme_rdma_create_io_queues(struct nvme_rdma_ctrl *ctrl) { - struct nvmf_ctrl_options *opts = ctrl->ctrl.opts; int ret; - ret = nvme_set_queue_count(&ctrl->ctrl, &opts->nr_io_queues); - if (ret) - return ret; - - ctrl->queue_count = opts->nr_io_queues + 1; - if (ctrl->queue_count < 2) - return 0; - - dev_info(ctrl->ctrl.device, - "creating %d I/O queues.\n", opts->nr_io_queues); - ret = nvme_rdma_init_io_queues(ctrl); if (ret) return ret; |