[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] e1000: Problem with "disable CRC stripping workaround" patch
Hi Jesse, I just came across this: http://www.mail-archive.com/netdev@xxxxxxxxxxxxxxx/msg14547.html I'm seeing a problem with this currently under Xen's bridging configuration. Basically, with the patch, packets are being dropped at this point in net/bridge/br_forward.c: --- int br_dev_queue_push_xmit(struct sk_buff *skb) { /* drop mtu oversized packets except gso */ if (packet_length(skb) > skb->dev->mtu && !skb_is_gso(skb)) { kfree_skb(skb); -- What's happening that a 1500 byte packet comes in from e1000, onto the bridge and is to be forwarded to a device whose mtu is 1500. Because the CRC hasn't been stripped, skb->len is 1504 and the packet is dropped. One option is to fix this specific problem is to subtract the CRC length from skb->len in e1000, another is to raise the MTU on the receive side of Xen's loopback interface. I've attached a patch for the latter, but I've no real opinion on which is more correct. Cheers, Mark. Attachment:
xen-netback-jumbo-mtu-on-vif.patch _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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