diff options
| author | Roland Dreier <rolandd@cisco.com> | 2008-01-25 14:15:34 -0800 |
|---|---|---|
| committer | Roland Dreier <rolandd@cisco.com> | 2008-01-25 14:15:34 -0800 |
| commit | b3226184af6c13c9d5d38f13f0ef8e03f718bbf7 (patch) | |
| tree | e79a895f7c320ada2cf8a1faffb735f9fc098c8a | |
| parent | e57895d38991036f9ccf193b70fc5ebd5f6e6dc9 (diff) | |
| download | linux-b3226184af6c13c9d5d38f13f0ef8e03f718bbf7.tar.bz2 | |
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 <rolandd@cisco.com>
| -rw-r--r-- | 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 9d32c49cc651..7950aa6e8184 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; } |