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net-tc: extract skip classify bit from tc_verd

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Packets sent by the IFB device skip subsequent tc classification.
A single bit governs this state. Move it out of tc_verd in
anticipation of removing that __u16 completely.

The new bitfield tc_skip_classify temporarily uses one bit of a
hole, until tc_verd is removed completely in a follow-up patch.

Remove the bit hole comment. It could be 2, 3, 4 or 5 bits long.
With that many options, little value in documenting it.

Introduce a helper function to deduplicate the logic in the two
sites that check this bit.

The field tc_skip_classify is set only in IFB on skbs cloned in
act_mirred, so original packet sources do not have to clear the
bit when reusing packets (notably, pktgen and octeon).

Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Willem de Bruijn 2017-01-07 17:06:35 -05:00 • committed by David S. Miller
parent d6264071ce
commit e7246e122a
6 changed files with 23 additions and 22 deletions
Download patch file Download diff file Expand all files Collapse all files

11
net/sched/act_api.c
View file

@ -426,11 +426,9 @@ int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
{
int ret = -1, i;
if (skb->tc_verd & TC_NCLS) {
skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
ret = TC_ACT_OK;
goto exec_done;
}
if (skb_skip_tc_classify(skb))
return TC_ACT_OK;
for (i = 0; i < nr_actions; i++) {
const struct tc_action *a = actions[i];
@ -439,9 +437,8 @@ repeat:
if (ret == TC_ACT_REPEAT)
goto repeat; /* we need a ttl - JHS */
if (ret != TC_ACT_PIPE)
goto exec_done;
break;
}
exec_done:
return ret;
}
EXPORT_SYMBOL(tcf_action_exec);