From c7d792f9b8b0502c807ecda57aeb5eac70cc7ab9 Mon Sep 17 00:00:00 2001 From: Max Gurtovoy Date: Thu, 23 Sep 2021 00:55:37 +0300 Subject: nvmet-rdma: implement get_max_queue_size controller op Limit the maximal queue size for RDMA controllers. Today, the target reports a limit of 1024 and this limit isn't valid for some of the RDMA based controllers. For now, limit RDMA transport to 128 entries (the max queue depth configured for Linux NVMe/RDMA host). Future general solution should use RDMA/core API to calculate this size according to device capabilities and number of WRs needed per NVMe IO request. Reported-by: Mark Ruijter Reviewed-by: Chaitanya Kulkarni Signed-off-by: Max Gurtovoy Signed-off-by: Christoph Hellwig --- drivers/nvme/target/rdma.c | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'drivers/nvme/target') diff --git a/drivers/nvme/target/rdma.c b/drivers/nvme/target/rdma.c index 6f75e6be2ce3..1deb4043e242 100644 --- a/drivers/nvme/target/rdma.c +++ b/drivers/nvme/target/rdma.c @@ -2000,6 +2000,11 @@ static u8 nvmet_rdma_get_mdts(const struct nvmet_ctrl *ctrl) return NVMET_RDMA_MAX_MDTS; } +static u16 nvmet_rdma_get_max_queue_size(const struct nvmet_ctrl *ctrl) +{ + return NVME_RDMA_MAX_QUEUE_SIZE; +} + static const struct nvmet_fabrics_ops nvmet_rdma_ops = { .owner = THIS_MODULE, .type = NVMF_TRTYPE_RDMA, @@ -2011,6 +2016,7 @@ static const struct nvmet_fabrics_ops nvmet_rdma_ops = { .delete_ctrl = nvmet_rdma_delete_ctrl, .disc_traddr = nvmet_rdma_disc_port_addr, .get_mdts = nvmet_rdma_get_mdts, + .get_max_queue_size = nvmet_rdma_get_max_queue_size, }; static void nvmet_rdma_remove_one(struct ib_device *ib_device, void *client_data) -- cgit v1.2.3