[PATCH 5/8] nvme-rdma: introduce NVME_RDMA_MAX_METADATA_QUEUE_SIZE definition

Max Gurtovoy
2024-01-04T09:26:28Z

This definition will be used by controllers that are configured with
metadata support. For now, both regular and metadata controllers have
the same maximal queue size but later commit will increase the maximal
queue size for regular RDMA controllers to 256.
We'll keep the maximal queue size for metadata controllers to be 128
since there are more resources that are needed for metadata operations
and 128 is the optimal size found for metadata controllers base on
testing.

Reviewed-by: Israel Rukshin <israelr@nvidia.com>
Signed-off-by: Max Gurtovoy <mgurtovoy@nvidia.com>
---
drivers/nvme/target/rdma.c | 2 ++
include/linux/nvme-rdma.h | 3 ++-
2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/nvme/target/rdma.c b/drivers/nvme/target/rdma.c
index 4597bca43a6d..f298295c0b0f 100644
--- a/drivers/nvme/target/rdma.c
+++ b/drivers/nvme/target/rdma.c
@@ -2002,6 +2002,8 @@ static u8 nvmet_rdma_get_mdts(const struct nvmet_ctrl *ctrl)

static u16 nvmet_rdma_get_max_queue_size(const struct nvmet_ctrl *ctrl)
{
+ if (ctrl->pi_support)
+ return NVME_RDMA_MAX_METADATA_QUEUE_SIZE;
return NVME_RDMA_MAX_QUEUE_SIZE;
}

diff --git a/include/linux/nvme-rdma.h b/include/linux/nvme-rdma.h
index 146dd2223a5f..d0b9941911a1 100644
--- a/include/linux/nvme-rdma.h
+++ b/include/linux/nvme-rdma.h
@@ -8,7 +8,8 @@

#define NVME_RDMA_IP_PORT 4420

-#define NVME_RDMA_MAX_QUEUE_SIZE 128
+#define NVME_RDMA_MAX_QUEUE_SIZE 128
+#define NVME_RDMA_MAX_METADATA_QUEUE_SIZE 128

enum nvme_rdma_cm_fmt {
NVME_RDMA_CM_FMT_1_0 = 0x0,
--
2.18.1