diff options
authorPablo de Lara <>2015-12-10 09:28:27 +0000
committerThomas Monjalon <>2015-12-10 22:20:08 +0100
commit2704ad28ade10ea505e8827d1d0023ca84f40d23 (patch)
parente01993bf82e8c0af74def9a38b92b56932df157f (diff)
app/testpmd: swap MAC in IEEE1588 forwarding
IEEE1588 forwarding mode uses same port to receive and transmit packets. In this mode, the MAC address in the packets are not touched, and therefore, packets could be sent with the same destination MAC address as the MAC address of the port that is transmitting, which causes the packet to be dropped in some NICs. In order to avoid this scenario, MAC addresses are swapped before packet is sent out. Signed-off-by: Pablo de Lara <> Acked-by: John McNamara <>
1 files changed, 6 insertions, 0 deletions
diff --git a/app/test-pmd/ieee1588fwd.c b/app/test-pmd/ieee1588fwd.c
index c69023a..0d3b37a 100644
--- a/app/test-pmd/ieee1588fwd.c
+++ b/app/test-pmd/ieee1588fwd.c
@@ -123,6 +123,7 @@ ieee1588_packet_fwd(struct fwd_stream *fs)
struct rte_mbuf *mb;
struct ether_hdr *eth_hdr;
+ struct ether_addr addr;
struct ptpv2_msg *ptp_hdr;
uint16_t eth_type;
uint32_t timesync_index;
@@ -205,6 +206,11 @@ ieee1588_packet_fwd(struct fwd_stream *fs)
/* Read and check the RX timestamp. */
port_ieee1588_rx_timestamp_check(fs->rx_port, timesync_index);
+ /* Swap dest and src mac addresses. */
+ ether_addr_copy(&eth_hdr->d_addr, &addr);
+ ether_addr_copy(&eth_hdr->s_addr, &eth_hdr->d_addr);
+ ether_addr_copy(&addr, &eth_hdr->s_addr);
/* Forward PTP packet with hardware TX timestamp */
mb->ol_flags |= PKT_TX_IEEE1588_TMST;
fs->tx_packets += 1;