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authorRoland Dreier <rolandd@cisco.com>2008-04-16 21:09:28 -0700
committerRoland Dreier <rolandd@cisco.com>2008-04-16 21:09:28 -0700
commitf438000f7a31fad7cfd27f33ad324a250f4cd2df (patch)
treea838a17ddabf53c01c1115f33b3ab0c0c8ed1d75 /drivers/infiniband/hw
parentb832be1e4007f4a54954ec68bd865ff05d6babca (diff)
IB/mlx4: Micro-optimize mlx4_ib_post_send()
Rather than have build_mlx_header() return a negative value on failure and the length of the segments it builds on success, add a pointer parameter to return the length and return 0 on success. This matches the calling convention used for build_lso_seg() and generates slightly smaller code -- eg, on 64-bit x86: add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-22 (-22) function old new delta mlx4_ib_post_send 2023 2001 -22 Signed-off-by: Roland Dreier <rolandd@cisco.com>
Diffstat (limited to 'drivers/infiniband/hw')
-rw-r--r--drivers/infiniband/hw/mlx4/qp.c16
1 files changed, 8 insertions, 8 deletions
diff --git a/drivers/infiniband/hw/mlx4/qp.c b/drivers/infiniband/hw/mlx4/qp.c
index 2ba24308408..f5210c17e31 100644
--- a/drivers/infiniband/hw/mlx4/qp.c
+++ b/drivers/infiniband/hw/mlx4/qp.c
@@ -1200,7 +1200,7 @@ out:
}
static int build_mlx_header(struct mlx4_ib_sqp *sqp, struct ib_send_wr *wr,
- void *wqe)
+ void *wqe, unsigned *mlx_seg_len)
{
struct ib_device *ib_dev = &to_mdev(sqp->qp.ibqp.device)->ib_dev;
struct mlx4_wqe_mlx_seg *mlx = wqe;
@@ -1321,7 +1321,9 @@ static int build_mlx_header(struct mlx4_ib_sqp *sqp, struct ib_send_wr *wr,
i = 2;
}
- return ALIGN(i * sizeof (struct mlx4_wqe_inline_seg) + header_size, 16);
+ *mlx_seg_len =
+ ALIGN(i * sizeof (struct mlx4_wqe_inline_seg) + header_size, 16);
+ return 0;
}
static int mlx4_wq_overflow(struct mlx4_ib_wq *wq, int nreq, struct ib_cq *ib_cq)
@@ -1548,15 +1550,13 @@ int mlx4_ib_post_send(struct ib_qp *ibqp, struct ib_send_wr *wr,
case IB_QPT_SMI:
case IB_QPT_GSI:
- err = build_mlx_header(to_msqp(qp), wr, ctrl);
- if (err < 0) {
+ err = build_mlx_header(to_msqp(qp), wr, ctrl, &seglen);
+ if (unlikely(err)) {
*bad_wr = wr;
goto out;
}
- wqe += err;
- size += err / 16;
-
- err = 0;
+ wqe += seglen;
+ size += seglen / 16;
break;
default: