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net/mlx5: optimize copy of Ethernet header

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Use fewer instructions to copy the first two bytes of Ethernet headers to
work queue elements.

Signed-off-by: Nelio Laranjeiro <nelio.laranjeiro@6wind.com>
Acked-by: Adrien Mazarguil <adrien.mazarguil@6wind.com>
This commit is contained in:
Nélio Laranjeiro 2016-11-24 17:03:35 +01:00 committed by Ferruh Yigit
parent 61b09ae45a
commit eef822dd73
1 changed files with 4 additions and 5 deletions
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9
drivers/net/mlx5/mlx5_rxtx.c
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@ -408,7 +408,7 @@ mlx5_tx_burst(void *dpdk_txq, struct rte_mbuf **pkts, uint16_t pkts_n)
uintptr_t addr;
uint64_t naddr;
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;
@ -435,8 +435,8 @@ 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
@ -599,8 +599,7 @@ 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