Message ID | 1364783861-3363-1-git-send-email-roy.qing.li@gmail.com |
---|---|
State | RFC, archived |
Delegated to: | David Miller |
Headers | show |
On Mon, 2013-04-01 at 10:37 +0800, roy.qing.li@gmail.com wrote: > From: Li RongQing <roy.qing.li@gmail.com> > > 12b0004d1d1 (adjust skb_gso_segment() for calling in rx path) tries to kill warnings > by checking if ip_summed is CHECK_NONE or not in rx path, since if skb_gso_segment() > is called on rx path, and ->ip_summed has different meaning. > > but this maybe break skb if skb header is cloned, and not expand the header, since when > step into skb_mac_gso_segment(), which will still check ip_summed with CHECKSUM_PARTIAL, > then do gso_send_check(). and after __skb_gso_segment() in queue_gso_packets() of > openvswitch, queue_userspace_packet() still checks ip_summed with CHECKSUM_PARTIAL, > and do checksum. > > so I think it is enough to ignore the warning in rx path. > Did you see any bogus warning triggered by it? BTW, please Cc all the people involved in the original commit you mentioned above. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
No, I just read and analyze it, and think it is bogus. 2013/4/2 Cong Wang <amwang@redhat.com>: > On Mon, 2013-04-01 at 10:37 +0800, roy.qing.li@gmail.com wrote: >> From: Li RongQing <roy.qing.li@gmail.com> >> >> 12b0004d1d1 (adjust skb_gso_segment() for calling in rx path) tries to kill warnings >> by checking if ip_summed is CHECK_NONE or not in rx path, since if skb_gso_segment() >> is called on rx path, and ->ip_summed has different meaning. >> >> but this maybe break skb if skb header is cloned, and not expand the header, since when >> step into skb_mac_gso_segment(), which will still check ip_summed with CHECKSUM_PARTIAL, >> then do gso_send_check(). and after __skb_gso_segment() in queue_gso_packets() of >> openvswitch, queue_userspace_packet() still checks ip_summed with CHECKSUM_PARTIAL, >> and do checksum. >> >> so I think it is enough to ignore the warning in rx path. >> > > Did you see any bogus warning triggered by it? > > BTW, please Cc all the people involved in the original commit you > mentioned above. > > -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Wed, 2013-04-03 at 08:51 +0800, RongQing Li wrote:
> No, I just read and analyze it, and think it is bogus.
Please rewrite the changelog, because I read it several times and could
not understand it.
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OK. 2013/4/3 Eric Dumazet <eric.dumazet@gmail.com>: > On Wed, 2013-04-03 at 08:51 +0800, RongQing Li wrote: >> No, I just read and analyze it, and think it is bogus. > > Please rewrite the changelog, because I read it several times and could > not understand it. > > > > -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/net/core/dev.c b/net/core/dev.c index de930b7..bf0e586 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -2269,17 +2269,6 @@ struct sk_buff *skb_mac_gso_segment(struct sk_buff *skb, } EXPORT_SYMBOL(skb_mac_gso_segment); - -/* openvswitch calls this on rx path, so we need a different check. - */ -static inline bool skb_needs_check(struct sk_buff *skb, bool tx_path) -{ - if (tx_path) - return skb->ip_summed != CHECKSUM_PARTIAL; - else - return skb->ip_summed == CHECKSUM_NONE; -} - /** * __skb_gso_segment - Perform segmentation on skb. * @skb: buffer to segment @@ -2294,10 +2283,11 @@ static inline bool skb_needs_check(struct sk_buff *skb, bool tx_path) struct sk_buff *__skb_gso_segment(struct sk_buff *skb, netdev_features_t features, bool tx_path) { - if (unlikely(skb_needs_check(skb, tx_path))) { + if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) { int err; - skb_warn_bad_offload(skb); + if (tx_path) + skb_warn_bad_offload(skb); if (skb_header_cloned(skb) && (err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))