[PATCH 6/8] nvme-rdma: clamp queue size according to ctrl cap

[Max Gurtovoy]

If a controller is configured with metadata support, clamp the maximal
queue size to be 128 since there are more resources that are needed
for metadata operations. Otherwise, clamp it to 256.

Reviewed-by: Israel Rukshin <israelr at nvidia.com>
Signed-off-by: Max Gurtovoy <mgurtovoy at nvidia.com>
---
 drivers/nvme/host/rdma.c | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c
index bc90ec3c51b0..d81a7148fbc5 100644
--- a/drivers/nvme/host/rdma.c
+++ b/drivers/nvme/host/rdma.c
@@ -1029,11 +1029,20 @@ static int nvme_rdma_setup_ctrl(struct nvme_rdma_ctrl *ctrl, bool new)
 			ctrl->ctrl.opts->queue_size, ctrl->ctrl.sqsize + 1);
 	}
 
-	if (ctrl->ctrl.sqsize + 1 > NVME_RDMA_MAX_QUEUE_SIZE) {
-		dev_warn(ctrl->ctrl.device,
-			"ctrl sqsize %u > max queue size %u, clamping down\n",
-			ctrl->ctrl.sqsize + 1, NVME_RDMA_MAX_QUEUE_SIZE);
-		ctrl->ctrl.sqsize = NVME_RDMA_MAX_QUEUE_SIZE - 1;
+	if (ctrl->ctrl.max_integrity_segments) {
+		if (ctrl->ctrl.sqsize + 1 > NVME_RDMA_MAX_METADATA_QUEUE_SIZE) {
+			dev_warn(ctrl->ctrl.device,
+				"ctrl sqsize %u > max queue size %u, clamping down\n",
+				ctrl->ctrl.sqsize + 1, NVME_RDMA_MAX_METADATA_QUEUE_SIZE);
+			ctrl->ctrl.sqsize = NVME_RDMA_MAX_METADATA_QUEUE_SIZE - 1;
+		}
+	} else {
+		if (ctrl->ctrl.sqsize + 1 > NVME_RDMA_MAX_QUEUE_SIZE) {
+			dev_warn(ctrl->ctrl.device,
+				"ctrl sqsize %u > max queue size %u, clamping down\n",
+				ctrl->ctrl.sqsize + 1, NVME_RDMA_MAX_QUEUE_SIZE);
+			ctrl->ctrl.sqsize = NVME_RDMA_MAX_QUEUE_SIZE - 1;
+		}
 	}
 
 	if (ctrl->ctrl.sqsize + 1 > ctrl->ctrl.maxcmd) {
-- 
2.18.1