[dpdk-users] xl710 NIC doesn't receive 1518 bytes packets

[Alex Kiselev <kiselev99@gmail.com>]

Hi.

It seems that xl710 NIC doesn't receive 1518 (maximum MTU size 1500 +
dot1q ethernet header
18 bytes) bytes packets. And there is no such problem when I use x520 NIC.

I am sending ipv4 ICMP ping packets and I am sure that packets go out
from the port
on the switch to which my application is connected. This is the
tcpdump output from the mirror port:

00:17:52.644171 f8:32:e4:72:61:1b > 68:05:ca:30:61:80, ethertype
802.1Q (0x8100), length 1518: vlan 10, p 0, ethertype IPv4, (tos 0x0,
ttl 64, id 630, offset 0, flags [DF], proto ICMP (1), length 1500)
    1.0.0.2 > 1.0.0.1: ICMP echo request, id 5386, seq 7, length 1480

And I if send 1514 bytes packets everything is also ok

h7 ~ # ip netns exec bs1 ping -s 1468 1.0.0.1
PING 1.0.0.1 (1.0.0.1) 1468(1496) bytes of data.
1476 bytes from 1.0.0.1: icmp_seq=1 ttl=64 time=0.935 ms

tcpdump on mirror switch port for 1514 bytes (ping 1468):

00:28:15.890543 f8:32:e4:72:61:1b > 68:05:ca:30:61:80, ethertype
802.1Q (0x8100), length 1514: vlan 10, p 0, ethertype IPv4, (tos 0x0,
ttl 64, id 22101, offset 0, flags [DF], proto ICMP (1), length 1496)
    1.0.0.2 > 1.0.0.1: ICMP echo request, id 5389, seq 1, length 1476
00:28:15.890548 68:05:ca:30:61:80 > f8:32:e4:72:61:1b, ethertype
802.1Q (0x8100), length 1514: vlan 10, p 0, ethertype IPv4, (tos 0x0,
ttl 64, id 22101, offset 0, flags [DF], proto ICMP (1), length 1496)
    1.0.0.1 > 1.0.0.2: ICMP echo reply, id 5389, seq 1, length 1476

I’ve tried to use rte_eth_dev_set_mtu() with different parameters
but nothing has changed.

Have I missed something to configure?

Thanks.

--
Alex Kiselev