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authorRoland Dreier <rolandd@cisco.com>2008-01-25 14:15:34 -0800
committerRoland Dreier <rolandd@cisco.com>2008-01-25 14:15:34 -0800
commitb3226184af6c13c9d5d38f13f0ef8e03f718bbf7 (patch)
treee79a895f7c320ada2cf8a1faffb735f9fc098c8a /drivers/infiniband/hw
parentIB/mthca: Remove MSI support as scheduled (diff)
downloadlinux-dev-b3226184af6c13c9d5d38f13f0ef8e03f718bbf7.tar.xz
linux-dev-b3226184af6c13c9d5d38f13f0ef8e03f718bbf7.zip
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>
Diffstat (limited to 'drivers/infiniband/hw')
-rw-r--r--drivers/infiniband/hw/mlx4/cq.c9
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;
}