Hi folks,
Resurrecting this old thread. I ran across this issue recently in DPDK
17.05, and it's also present in17.08. It appears no fix was committed.
I'm working on a solution, but if anyone has a fix in flight please let
me know.
Regards,
Roger
On 4/29/16 3:29 AM, Olivier Matz wrote:
Hi,
On 04/25/2016 04:35 AM, zhang.xingh...@zte.com.cn wrote:
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);
In rte_mbuf.h, it is specified that these values (vlan_tci and
vlan_tci_outer) must be stored in CPU order.
It's probably a driver or hardware issue. Note that in linux there is
something that looks similar to your issue:
http://lxr.free-electrons.com/source/drivers/net/ethernet/intel/igb/igb_main.c#L1278
/* On i350, i354, i210, and i211, loopback VLAN packets
* have the tag byte-swapped.
*/
if (adapter->hw.mac.type >= e1000_i350)
set_bit(IGB_RING_FLAG_RX_LB_VLAN_BSWAP, &ring->flags);
I think you could check if the same thing is done in the
dpdk driver.
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Regards,
Olivier
.
