From 632bc3f65081dd1e2e5394a9161580a0f78e8839 Mon Sep 17 00:00:00 2001 From: Bart Van Assche Date: Thu, 21 Jul 2016 13:03:30 -0700 Subject: IB/core, RDMA RW API: Do not exceed QP SGE send limit Compute the SGE limit for RDMA READ and WRITE requests in ib_create_qp(). Use that limit in the RDMA RW API implementation. Signed-off-by: Bart Van Assche Cc: Christoph Hellwig Cc: Sagi Grimberg Cc: Steve Wise Cc: Parav Pandit Cc: Nicholas Bellinger Cc: Laurence Oberman Cc: #v4.7+ Reviewed-by: Christoph Hellwig Signed-off-by: Doug Ledford --- drivers/infiniband/core/rw.c | 10 ++-------- 1 file changed, 2 insertions(+), 8 deletions(-) (limited to 'drivers/infiniband/core/rw.c') diff --git a/drivers/infiniband/core/rw.c b/drivers/infiniband/core/rw.c index 1ad2baaa6c8c..dbfd854c32c9 100644 --- a/drivers/infiniband/core/rw.c +++ b/drivers/infiniband/core/rw.c @@ -58,13 +58,6 @@ static inline bool rdma_rw_io_needs_mr(struct ib_device *dev, u8 port_num, return false; } -static inline u32 rdma_rw_max_sge(struct ib_device *dev, - enum dma_data_direction dir) -{ - return dir == DMA_TO_DEVICE ? - dev->attrs.max_sge : dev->attrs.max_sge_rd; -} - static inline u32 rdma_rw_fr_page_list_len(struct ib_device *dev) { /* arbitrary limit to avoid allocating gigantic resources */ @@ -186,7 +179,8 @@ static int rdma_rw_init_map_wrs(struct rdma_rw_ctx *ctx, struct ib_qp *qp, u64 remote_addr, u32 rkey, enum dma_data_direction dir) { struct ib_device *dev = qp->pd->device; - u32 max_sge = rdma_rw_max_sge(dev, dir); + u32 max_sge = dir == DMA_TO_DEVICE ? qp->max_write_sge : + qp->max_read_sge; struct ib_sge *sge; u32 total_len = 0, i, j; -- cgit v1.2.3