[dpdk-dev] [PATCH 6/7] net/mlx5: optimize copy of Ethernet header
Nelio Laranjeiro
nelio.laranjeiro at 6wind.com
Thu Nov 24 17:03:35 CET 2016
Use fewer instructions to copy the first two bytes of Ethernet headers to
work queue elements.
Signed-off-by: Nelio Laranjeiro <nelio.laranjeiro at 6wind.com>
Acked-by: Adrien Mazarguil <adrien.mazarguil at 6wind.com>
---
drivers/net/mlx5/mlx5_rxtx.c | 9 ++++-----
1 file changed, 4 insertions(+), 5 deletions(-)
diff --git a/drivers/net/mlx5/mlx5_rxtx.c b/drivers/net/mlx5/mlx5_rxtx.c
index 0d0b807..4b8c197 100644
--- a/drivers/net/mlx5/mlx5_rxtx.c
+++ b/drivers/net/mlx5/mlx5_rxtx.c
@@ -409,7 +409,7 @@ mlx5_tx_burst(void *dpdk_txq, struct rte_mbuf **pkts, uint16_t pkts_n)
unsigned int ds = 0;
uintptr_t addr;
uint16_t pkt_inline_sz = MLX5_WQE_DWORD_SIZE;
- uint8_t ehdr[2];
+ uint16_t ehdr;
uint8_t cs_flags = 0;
#ifdef MLX5_PMD_SOFT_COUNTERS
uint32_t total_length = 0;
@@ -436,8 +436,8 @@ mlx5_tx_burst(void *dpdk_txq, struct rte_mbuf **pkts, uint16_t pkts_n)
rte_prefetch0(*pkts);
addr = rte_pktmbuf_mtod(buf, uintptr_t);
length = DATA_LEN(buf);
- ehdr[0] = ((uint8_t *)addr)[0];
- ehdr[1] = ((uint8_t *)addr)[1];
+ ehdr = (((uint8_t *)addr)[1] << 8) |
+ ((uint8_t *)addr)[0];
#ifdef MLX5_PMD_SOFT_COUNTERS
total_length = length;
#endif
@@ -600,8 +600,7 @@ mlx5_tx_burst(void *dpdk_txq, struct rte_mbuf **pkts, uint16_t pkts_n)
0,
cs_flags,
0,
- (ehdr[1] << 24) | (ehdr[0] << 16) |
- htons(pkt_inline_sz),
+ (ehdr << 16) | htons(pkt_inline_sz),
};
txq->wqe_ci += (ds + 3) / 4;
#ifdef MLX5_PMD_SOFT_COUNTERS
--
2.1.4
More information about the dev
mailing list