[PATCH V2 2/3] nvmet-rdma: Implement get_mdts controller op
From: Max Gurtovoy <hidden>
Date: 2020-03-05 09:55:44
Subsystem:
nvm express target driver, the rest · Maintainers:
Christoph Hellwig, Sagi Grimberg, Chaitanya Kulkarni, Linus Torvalds
Set the maximal data transfer size to be 1MB (currently mdts is unlimited). This will allow calculating the amount of MR's that one ctrl should allocate to fulfill it's capabilities. Signed-off-by: Max Gurtovoy <redacted> --- changes from V1: - renamed nvmet_rdma_set_mdts to nvmet_rdma_get_mdts - align to get_mdts callback changes --- drivers/nvme/target/rdma.c | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/drivers/nvme/target/rdma.c b/drivers/nvme/target/rdma.c
index 37d262a..d12ef0d 100644
--- a/drivers/nvme/target/rdma.c
+++ b/drivers/nvme/target/rdma.c@@ -30,6 +30,7 @@ #define NVMET_RDMA_DEFAULT_INLINE_DATA_SIZE PAGE_SIZE #define NVMET_RDMA_MAX_INLINE_SGE 4 #define NVMET_RDMA_MAX_INLINE_DATA_SIZE max_t(int, SZ_16K, PAGE_SIZE) +#define NVMET_RDMA_MAX_MDTS 8 struct nvmet_rdma_cmd { struct ib_sge sge[NVMET_RDMA_MAX_INLINE_SGE + 1];
@@ -1602,6 +1603,12 @@ static void nvmet_rdma_disc_port_addr(struct nvmet_req *req, } } +static u8 nvmet_rdma_get_mdts(const struct nvmet_ctrl *ctrl) +{ + /* Assume mpsmin == device_page_size == 4KB */ + return NVMET_RDMA_MAX_MDTS; +} + static const struct nvmet_fabrics_ops nvmet_rdma_ops = { .owner = THIS_MODULE, .type = NVMF_TRTYPE_RDMA,
@@ -1612,6 +1619,7 @@ static void nvmet_rdma_disc_port_addr(struct nvmet_req *req, .queue_response = nvmet_rdma_queue_response, .delete_ctrl = nvmet_rdma_delete_ctrl, .disc_traddr = nvmet_rdma_disc_port_addr, + .get_mdts = nvmet_rdma_get_mdts, }; static void nvmet_rdma_remove_one(struct ib_device *ib_device, void *client_data)
--
1.8.3.1
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