When using I350 working on SR-IOV mode, we got confused that byte order
of vlan_tci in the VF received packet descriptor is different when the
packet source is different.
1) Packets from VF to VF, the byte order is big-endian. (e.g. 0xF00)
2) Packets from PC to VF, the byte order is little-endian. (e.g. 0xF)
Below is the testing net-work:
VM0 VM1 PC
VF0 VF1 |
| | |
+------+------+ |
| |
PF |
hypervisor |
SR-IOV NIC |
| |
| VLAN 15 |
+---------switch-------+
We make a breakpoint at the following line of eth_igb_recv_pkts, the
vlan_tci
we observed that everytime.
uint16_t
eth_igb_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,
uint16_t nb_pkts)
/* Only valid if PKT_RX_VLAN_PKT set in pkt_flags */
rxm->vlan_tci = rte_le_to_cpu_16(rxd.wb.upper.vlan);
Thanks.
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