nvme-rdma: force queue size to respect controller capability

Queue size needs to respect the Maximum Queue Entries Supported advertised by
the controller in its Capability register.

Signed-off-by: Samuel Jones <sjones@kalray.eu>
Reviewed-by: Christoph Hellwig <hch@lst.de>
[sagig: fixed queue_size adjustment according to
Daniel Verkamp <daniel.verkamp@intel.com> comment]
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>

diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c
index ff1b340606b277924ff58e28303324c7b7bf4742..d1df4a5eb1e6e2123242ae5929b2d9abc4c8821b 100644 (file)
--- a/drivers/nvme/host/rdma.c
+++ b/drivers/nvme/host/rdma.c
@@ -1904,6 +1904,14 @@ static struct nvme_ctrl *nvme_rdma_create_ctrl(struct device *dev,
                opts->queue_size = ctrl->ctrl.maxcmd;
        }
 
+       if (opts->queue_size > ctrl->ctrl.sqsize + 1) {
+               /* warn if sqsize is lower than queue_size */
+               dev_warn(ctrl->ctrl.device,
+                       "queue_size %zu > ctrl sqsize %u, clamping down\n",
+                       opts->queue_size, ctrl->ctrl.sqsize + 1);
+               opts->queue_size = ctrl->ctrl.sqsize + 1;
+       }
+
        if (opts->nr_io_queues) {
                ret = nvme_rdma_create_io_queues(ctrl);
                if (ret)