Hi,
I'm sending non-IP packets with dev_queue_xmit. It's not linear as expected in
receiving side when whole packet len only 513 bytes(include mac header). 513
bytes is a boundary because if I use 512, it's ok. Anybody know what may cause
this problem? Thanks. My MTU is 1500.
In sending side, I print the skb, seems it's normal:
>> Mar 9 22:41:03.972683 info CLA-0 kernel: [251326.875463]: before
>> dev_queue_xmit: skb->data_len=0, skb->len=513.
In receiving side, I register my softirq handler with own ether-type. The skb
I got from kernel is:
>> Mar 9 22:41:03.973199 info CLA-1 kernel: [11139.235550]:
>> skb->data_len=1,skb->len=499.
So skb_is_nonlinear return true when skb->data_len>0.
Kernel version: 2.6.34.13
82599 firmware and driver version:
# ethtool -i bi0
driver: igb
version: 2.4.12
firmware-version: 2.1-3
bus-info: 0000:02:00.0
# ifconfig bi0
bi0 Link encap:Ethernet HWaddr 00:A0:A5:64:DB:FA
UP BROADCAST RUNNING SLAVE MULTICAST MTU:1500 Metric:1
RX packets:46846508 errors:0 dropped:0 overruns:0 frame:0
TX packets:47748723 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:5803096993 (5.4 GiB) TX bytes:55743743072 (51.9 GiB)
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Best Regards.
Liming
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