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/sw/rxe/rxe_qp.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) (limited to 'drivers/infiniband/sw/rxe/rxe_qp.c') diff --git a/drivers/infiniband/sw/rxe/rxe_qp.c b/drivers/infiniband/sw/rxe/rxe_qp.c index 9f83fc982f31..c58452daffc7 100644 --- a/drivers/infiniband/sw/rxe/rxe_qp.c +++ b/drivers/infiniband/sw/rxe/rxe_qp.c @@ -49,9 +49,9 @@ static int rxe_qp_chk_cap(struct rxe_dev *rxe, struct ib_qp_cap *cap, goto err1; } - if (cap->max_send_sge > rxe->attr.max_sge) { + if (cap->max_send_sge > rxe->attr.max_send_sge) { pr_warn("invalid send sge = %d > %d\n", - cap->max_send_sge, rxe->attr.max_sge); + cap->max_send_sge, rxe->attr.max_send_sge); goto err1; } @@ -62,9 +62,9 @@ static int rxe_qp_chk_cap(struct rxe_dev *rxe, struct ib_qp_cap *cap, goto err1; } - if (cap->max_recv_sge > rxe->attr.max_sge) { + if (cap->max_recv_sge > rxe->attr.max_recv_sge) { pr_warn("invalid recv sge = %d > %d\n", - cap->max_recv_sge, rxe->attr.max_sge); + cap->max_recv_sge, rxe->attr.max_recv_sge); goto err1; } } -- cgit v1.2.3-59-g8ed1b