icmp packets on em larger than 1472

Hi,

All my em cards running 8.1 stable don't reply to icmp echo requests packets larger than 1472 bytes.

On stable 7.2 the same hardware works as expected:
# ping -s 1500 192.168.64.99
PING 192.168.64.99 (192.168.64.99): 1500 data bytes
1508 bytes from 192.168.64.99: icmp_seq=0 ttl=63 time=1.249 ms
1508 bytes from 192.168.64.99: icmp_seq=1 ttl=63 time=1.158 ms

Here is the dump on em interface
15:06:31.452043 IP 192.168.66.65 > *****: ICMP echo request, id 28729, seq 5, length 1480
15:06:31.452047 IP 192.168.66.65 > ****: icmp
15:06:31.452069 IP **** > 192.168.66.65: ICMP echo reply, id 28729, seq 5, length 1480
15:06:31.452071 IP *** > 192.168.66.65: icmp
 
Same ping from same source (it's a 8.1 stable with fxp interface) to em card running 8.1 stable
#pciconf -lv
em0@pci0:3:4:0:	class=0x020000 card=0x10798086 chip=0x10798086 rev=0x03 hdr=0x00
    vendor     = 'Intel Corporation'
    device     = 'Dual Port Gigabit Ethernet Controller (82546EB)'
    class      = network
    subclass   = ethernet

# ping -s 1472 192.168.64.200
PING 192.168.64.200 (192.168.64.200): 1472 data bytes
1480 bytes from 192.168.64.200: icmp_seq=0 ttl=63 time=0.848 ms
^C

# ping -s 1473 192.168.64.200
PING 192.168.64.200 (192.168.64.200): 1473 data bytes
^C
--- 192.168.64.200 ping statistics ---
4 packets transmitted, 0 packets received, 100.0% packet loss

And here is it's dump on em card
5:11:15.191496 IP 192.168.66.65 > *****: ICMP echo request, id 33593, seq 0, length 1480
15:11:15.191534 IP 192.168.66.65 > *****: icmp
15:11:16.192119 IP 192.168.66.65 > *****: ICMP echo request, id 33593, seq 1, length 1480
15:11:16.192156 IP 192.168.66.65 > ******: icmp

igb cards on 8.1 stable are not affected

Regards,
Kirill


      
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