[dpdk-stable] [PATCH] app/testpmd: improve MAC swap performance
Qi Zhang
qi.z.zhang at intel.com
Tue Nov 20 05:45:37 CET 2018
The patch optimizes the mac swap operation by taking advantage
of SSE instructions, it only impacts x86 platform.
Cc: stable at dpdk.org
Signed-off-by: Qi Zhang <qi.z.zhang at intel.com>
---
app/test-pmd/macswap.c | 16 +++++++++++++++-
1 file changed, 15 insertions(+), 1 deletion(-)
diff --git a/app/test-pmd/macswap.c b/app/test-pmd/macswap.c
index a8384d5b8..0722782b0 100644
--- a/app/test-pmd/macswap.c
+++ b/app/test-pmd/macswap.c
@@ -78,7 +78,6 @@ pkt_burst_mac_swap(struct fwd_stream *fs)
struct rte_port *txp;
struct rte_mbuf *mb;
struct ether_hdr *eth_hdr;
- struct ether_addr addr;
uint16_t nb_rx;
uint16_t nb_tx;
uint16_t i;
@@ -95,6 +94,15 @@ pkt_burst_mac_swap(struct fwd_stream *fs)
start_tsc = rte_rdtsc();
#endif
+#ifdef RTE_ARCH_X86
+ __m128i addr;
+ __m128i shfl_msk = _mm_set_epi8(15, 14, 13, 12,
+ 5, 4, 3, 2,
+ 1, 0, 11, 10,
+ 9, 8, 7, 6);
+#else
+ struct ether_addr addr;
+#endif
/*
* Receive a burst of packets and forward them.
*/
@@ -123,9 +131,15 @@ pkt_burst_mac_swap(struct fwd_stream *fs)
eth_hdr = rte_pktmbuf_mtod(mb, struct ether_hdr *);
/* Swap dest and src mac addresses. */
+#ifdef RTE_ARCH_X86
+ addr = _mm_loadu_si128((__m128i *)eth_hdr);
+ addr = _mm_shuffle_epi8(addr, shfl_msk);
+ _mm_storeu_si128((__m128i *)eth_hdr, addr);
+#else
ether_addr_copy(ð_hdr->d_addr, &addr);
ether_addr_copy(ð_hdr->s_addr, ð_hdr->d_addr);
ether_addr_copy(&addr, ð_hdr->s_addr);
+#endif
mb->ol_flags &= IND_ATTACHED_MBUF | EXT_ATTACHED_MBUF;
mb->ol_flags |= ol_flags;
--
2.13.6
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