IB/core, RDMA RW API: Do not exceed QP SGE send limit (632bc3f6) · Commits · 戴 / test

drivers/infiniband/core/rw.c

+2 −8

Original line number	Diff line number	Diff line
		@@ -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;

+9 −0

Original line number	Diff line number	Diff line
		@@ -814,6 +814,15 @@ struct ib_qp ib_create_qp(struct ib_pd pd,
		}
		}

		/*
		* Note: all hw drivers guarantee that max_send_sge is lower than
		* the device RDMA WRITE SGE limit but not all hw drivers ensure that
		* max_send_sge <= max_sge_rd.
		*/
		qp->max_write_sge = qp_init_attr->cap.max_send_sge;
		qp->max_read_sge = min_t(u32, qp_init_attr->cap.max_send_sge,
		device->attrs.max_sge_rd);

		return qp;
		}
		EXPORT_SYMBOL(ib_create_qp);

+6 −0

Original line number	Diff line number	Diff line
		@@ -1428,6 +1428,10 @@ struct ib_srq {
		} ext;
		};

		/*
		* @max_write_sge: Maximum SGE elements per RDMA WRITE request.
		* @max_read_sge: Maximum SGE elements per RDMA READ request.
		*/
		struct ib_qp {
		struct ib_device *device;
		struct ib_pd *pd;
		@@ -1449,6 +1453,8 @@ struct ib_qp {
		void (event_handler)(struct ib_event , void *);
		void *qp_context;
		u32 qp_num;
		u32 max_write_sge;
		u32 max_read_sge;
		enum ib_qp_type qp_type;
		};