Date: Thu, 5 Nov 2015 16:01:22 +0100 (CET) From: elof2@sentor.se To: freebsd-net <freebsd-net@freebsd.org> Subject: ngrep/ixgbe bpf bug Message-ID: <alpine.BSF.2.00.1511051551350.49057@farmermaggot.shire.sentor.se>
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Hi all!
Why don't ngrep work on ix interfaces?
It shows nice values if I sniff on other interfaces, e.g. igb0 and
bridge0:
# ngrep -d igb0 "q" ip
I see some matching packets. Everything looks good.
# netstat -B
Pid Netif Flags Recv Drop Match Sblen Hblen Command
1800 igb0 p--s--- 135 0 129 380 0 ngrep
The BPF stats show Recv and Match values. Good.
# ngrep -d bridge0 "q" ip
I see some matching packets. Good.
# netstat -B
Pid Netif Flags Recv Drop Match Sblen Hblen Command
1901 bridge0 p--s--- 661897 0 659170 425606 0 ngrep
Again, the BPF stats show Recv and Match values. Good.
However, if I sniff on an ix interface:
# ngrep -d ix1 "q" ip
I get no matching packets!
# netstat -B
Pid Netif Flags Recv Drop Match Sblen Hblen Command
1816 ix1 p--s--- 45340 0 0 0 0 ngrep
^^^
...and the BPF stats always show zero Matches.
Bug in the ixgbe driver or in ngrep?
/Elof
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