Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=b3226184af6c13c9d5d38f13f0ef8e03f718bbf7
Commit: b3226184af6c13c9d5d38f13f0ef8e03f718bbf7
Parent: e57895d38991036f9ccf193b70fc5ebd5f6e6dc9
Author: Roland Dreier <[EMAIL PROTECTED]>
AuthorDate: Fri Jan 25 14:15:34 2008 -0800
Committer: Roland Dreier <[EMAIL PROTECTED]>
CommitDate: Fri Jan 25 14:15:34 2008 -0800
IB/mlx4: Micro-optimize mlx4_ib_poll_one()
Rather than byte-swapping cqe->g_mlpath_rqpn each time we extract a
field from it, byte-swap it once into a temporary variable. This
results in smaller, better code -- eg, on 32-bit x86:
add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-5 (-5)
function old new delta
mlx4_ib_poll_cq 1188 1183 -5
Signed-off-by: Roland Dreier <[EMAIL PROTECTED]>
---
drivers/infiniband/hw/mlx4/cq.c | 9 +++++----
1 files changed, 5 insertions(+), 4 deletions(-)
diff --git a/drivers/infiniband/hw/mlx4/cq.c b/drivers/infiniband/hw/mlx4/cq.c
index 9d32c49..7950aa6 100644
--- a/drivers/infiniband/hw/mlx4/cq.c
+++ b/drivers/infiniband/hw/mlx4/cq.c
@@ -313,6 +313,7 @@ static int mlx4_ib_poll_one(struct mlx4_ib_cq *cq,
struct mlx4_ib_srq *srq;
int is_send;
int is_error;
+ u32 g_mlpath_rqpn;
u16 wqe_ctr;
cqe = next_cqe_sw(cq);
@@ -426,10 +427,10 @@ static int mlx4_ib_poll_one(struct mlx4_ib_cq *cq,
wc->slid = be16_to_cpu(cqe->rlid);
wc->sl = cqe->sl >> 4;
- wc->src_qp = be32_to_cpu(cqe->g_mlpath_rqpn) & 0xffffff;
- wc->dlid_path_bits = (be32_to_cpu(cqe->g_mlpath_rqpn) >> 24) &
0x7f;
- wc->wc_flags |= be32_to_cpu(cqe->g_mlpath_rqpn) &
0x80000000 ?
- IB_WC_GRH : 0;
+ g_mlpath_rqpn = be32_to_cpu(cqe->g_mlpath_rqpn);
+ wc->src_qp = g_mlpath_rqpn & 0xffffff;
+ wc->dlid_path_bits = (g_mlpath_rqpn >> 24) & 0x7f;
+ wc->wc_flags |= g_mlpath_rqpn & 0x80000000 ? IB_WC_GRH : 0;
wc->pkey_index = be32_to_cpu(cqe->immed_rss_invalid) & 0x7f;
}
-
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