IB/mlx4: Consolidate code to get an entry from a struct mlx4_buf

We use struct mlx4_buf for kernel QP, CQ and SRQ buffers, and the code
to look up an entry is duplicated in get_cqe_from_buf() and the QP and
SRQ versions of get_wqe().  Factor this out into mlx4_buf_offset().

This will also make it easier to switch over to using vmap() for buffers.

Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 1 insertions, 7 deletions

diff --git a/drivers/infiniband/hw/mlx4/srq.c b/drivers/infiniband/hw/mlx4/srq.c
index e7e9a3d0dac..beaa3b06cf5 100644
--- a/drivers/infiniband/hw/mlx4/srq.c
+++ b/drivers/infiniband/hw/mlx4/srq.c
@@ -38,13 +38,7 @@
 
 static void *get_wqe(struct mlx4_ib_srq *srq, int n)
 {
-        int offset = n << srq->msrq.wqe_shift;
-
-        if (srq->buf.nbufs == 1)
-                return srq->buf.u.direct.buf + offset;
-        else
-                return srq->buf.u.page_list[offset >> PAGE_SHIFT].buf +
-                        (offset & (PAGE_SIZE - 1));
+        return mlx4_buf_offset(&srq->buf, n << srq->msrq.wqe_shift);
 }
 
 static void mlx4_ib_srq_event(struct mlx4_srq *srq, enum mlx4_event type)