From 33023fb85a42b53bf778bc025f9667b582282be4 Mon Sep 17 00:00:00 2001 From: Steve Wise Date: Mon, 18 Jun 2018 08:05:26 -0700 Subject: IB/core: add max_send_sge and max_recv_sge attributes This patch replaces the ib_device_attr.max_sge with max_send_sge and max_recv_sge. It allows ulps to take advantage of devices that have very different send and recv sge depths. For example cxgb4 has a max_recv_sge of 4, yet a max_send_sge of 16. Splitting out these attributes allows much more efficient use of the SQ for cxgb4 with ulps that use the RDMA_RW API. Consider a large RDMA WRITE that has 16 scattergather entries. With max_sge of 4, the ulp would send 4 WRITE WRs, but with max_sge of 16, it can be done with 1 WRITE WR. Acked-by: Sagi Grimberg Acked-by: Christoph Hellwig Acked-by: Selvin Xavier Acked-by: Shiraz Saleem Acked-by: Dennis Dalessandro Signed-off-by: Steve Wise Signed-off-by: Jason Gunthorpe --- drivers/nvme/target/rdma.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/nvme/target') diff --git a/drivers/nvme/target/rdma.c b/drivers/nvme/target/rdma.c index 52e0c5d579a7..0d7f3d603f1d 100644 --- a/drivers/nvme/target/rdma.c +++ b/drivers/nvme/target/rdma.c @@ -874,7 +874,7 @@ static int nvmet_rdma_create_queue_ib(struct nvmet_rdma_queue *queue) qp_attr.cap.max_send_wr = queue->send_queue_size + 1; qp_attr.cap.max_rdma_ctxs = queue->send_queue_size; qp_attr.cap.max_send_sge = max(ndev->device->attrs.max_sge_rd, - ndev->device->attrs.max_sge); + ndev->device->attrs.max_send_sge); if (ndev->srq) { qp_attr.srq = ndev->srq; -- cgit v1.2.3-59-g8ed1b