From 0d5ee2b2ab4f6776c361bc975c2323bc8b5cf349 Mon Sep 17 00:00:00 2001 From: Steve Wise Date: Wed, 20 Jun 2018 07:15:10 -0700 Subject: nvmet-rdma: support max(16KB, PAGE_SIZE) inline data The patch enables inline data sizes using up to 4 recv sges, and capping the size at 16KB or at least 1 page size. So on a 4K page system, up to 16KB is supported, and for a 64K page system 1 page of 64KB is supported. We avoid > 0 order page allocations for the inline buffers by using multiple recv sges, one for each page. If the device cannot support the configured inline data size due to lack of enough recv sges, then log a warning and reduce the inline size. Add a new configfs port attribute, called param_inline_data_size, to allow configuring the size of inline data for a given nvmf port. The maximum size allowed is still enforced by nvmet-rdma with NVMET_RDMA_MAX_INLINE_DATA_SIZE, which is now max(16KB, PAGE_SIZE). And the default size, if not specified via configfs, is still PAGE_SIZE. This preserves the existing behavior, but allows larger inline sizes for small page systems. If the configured inline data size exceeds NVMET_RDMA_MAX_INLINE_DATA_SIZE, a warning is logged and the size is reduced. If param_inline_data_size is set to 0, then inline data is disabled for that nvmf port. Reviewed-by: Sagi Grimberg Reviewed-by: Max Gurtovoy Signed-off-by: Steve Wise Signed-off-by: Christoph Hellwig --- drivers/nvme/target/discovery.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/nvme/target/discovery.c') diff --git a/drivers/nvme/target/discovery.c b/drivers/nvme/target/discovery.c index 08656b849bd6..eae29f493a07 100644 --- a/drivers/nvme/target/discovery.c +++ b/drivers/nvme/target/discovery.c @@ -171,7 +171,7 @@ static void nvmet_execute_identify_disc_ctrl(struct nvmet_req *req) id->sgls = cpu_to_le32(1 << 0); /* we always support SGLs */ if (ctrl->ops->has_keyed_sgls) id->sgls |= cpu_to_le32(1 << 2); - if (ctrl->ops->sqe_inline_size) + if (req->port->inline_data_size) id->sgls |= cpu_to_le32(1 << 20); strcpy(id->subnqn, ctrl->subsys->subsysnqn); -- cgit v1.2.3