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/infiniband/hw/i40iw/i40iw_verbs.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'drivers/infiniband/hw/i40iw/i40iw_verbs.c') diff --git a/drivers/infiniband/hw/i40iw/i40iw_verbs.c b/drivers/infiniband/hw/i40iw/i40iw_verbs.c index 68679ad4c6da..8884ff71a634 100644 --- a/drivers/infiniband/hw/i40iw/i40iw_verbs.c +++ b/drivers/infiniband/hw/i40iw/i40iw_verbs.c @@ -71,7 +71,8 @@ static int i40iw_query_device(struct ib_device *ibdev, props->max_mr_size = I40IW_MAX_OUTBOUND_MESSAGE_SIZE; props->max_qp = iwdev->max_qp - iwdev->used_qps; props->max_qp_wr = I40IW_MAX_QP_WRS; - props->max_sge = I40IW_MAX_WQ_FRAGMENT_COUNT; + props->max_send_sge = I40IW_MAX_WQ_FRAGMENT_COUNT; + props->max_recv_sge = I40IW_MAX_WQ_FRAGMENT_COUNT; props->max_cq = iwdev->max_cq - iwdev->used_cqs; props->max_cqe = iwdev->max_cqe; props->max_mr = iwdev->max_mr - iwdev->used_mrs; -- cgit v1.2.3-59-g8ed1b