For IB and RoCE, the SGE limit for a queue pair is typically lower
than what is defined by the HCA limits. For iWARP, the RDMA READ SGE
limit is defined by dev->attrs.max_sge_rd. Modify rdma_rw_max_sge()
accordingly.
Signed-off-by: Bart Van Assche <bart.vanassche@xxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> #v4.7+
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Sagi Grimberg <sagi@xxxxxxxxxxx>
Cc: Steve Wise <swise@xxxxxxxxxxxxxxxxxxxxx>
Cc: Parav Pandit <pandit.parav@xxxxxxxxx>
Cc: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
Cc: Laurence Oberman <loberman@xxxxxxxxxx>
---
drivers/infiniband/core/rw.c | 8 ++++----
drivers/infiniband/core/verbs.c | 2 ++
include/rdma/ib_verbs.h | 1 +
3 files changed, 7 insertions(+), 4 deletions(-)
diff --git a/drivers/infiniband/core/rw.c b/drivers/infiniband/core/rw.c
index 1ad2baa..6ecdad6 100644
--- a/drivers/infiniband/core/rw.c
+++ b/drivers/infiniband/core/rw.c
@@ -58,11 +58,11 @@ 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,
+static inline u32 rdma_rw_max_sge(struct ib_device *dev, struct ib_qp *qp,
enum dma_data_direction dir)
{
- return dir == DMA_TO_DEVICE ?
- dev->attrs.max_sge : dev->attrs.max_sge_rd;
+ return dir == DMA_TO_DEVICE ? qp->max_send_sge :
+ min_t(u32, qp->max_send_sge, dev->attrs.max_sge_rd);
}
static inline u32 rdma_rw_fr_page_list_len(struct ib_device *dev)
@@ -186,7 +186,7 @@ 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 = rdma_rw_max_sge(dev, qp, dir);
struct ib_sge *sge;
u32 total_len = 0, i, j;
diff --git a/drivers/infiniband/core/verbs.c b/drivers/infiniband/core/verbs.c
index 6298f54..c7f840e 100644
--- a/drivers/infiniband/core/verbs.c
+++ b/drivers/infiniband/core/verbs.c
@@ -814,6 +814,8 @@ struct ib_qp *ib_create_qp(struct ib_pd *pd,
}
}
+ qp->max_send_sge = qp_init_attr->cap.max_send_sge;
+
return qp;
}
EXPORT_SYMBOL(ib_create_qp);
diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index 7e440d4..c44dbf6 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -1449,6 +1449,7 @@ struct ib_qp {
void (*event_handler)(struct ib_event *, void *);
void *qp_context;
u32 qp_num;
+ u32 max_send_sge;
enum ib_qp_type qp_type;
};
--
2.9.0
--
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