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nvme-rdma: handle cpu unplug when re-establishing the controller

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If a cpu unplug event has occured, we need to take the minimum
of the provided nr_io_queues and the number of online cpus,
otherwise we won't be able to connect them as blk-mq mapping
won't dispatch to those queues.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
This commit is contained in:
Sagi Grimberg 2017-03-09 13:26:07 +02:00
parent b25634e2a0
commit c248c64387
1 changed files with 14 additions and 14 deletions
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28
drivers/nvme/host/rdma.c
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@ -343,8 +343,6 @@ 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)
@ -652,8 +650,22 @@ 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);
@ -1791,20 +1803,8 @@ 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;