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net: sched: refactor reinsert action

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The TC_ACT_REINSERT return type was added as an in-kernel only option to
allow a packet ingress or egress redirect. This is used to avoid
unnecessary skb clones in situations where they are not required. If a TC
hook returns this code then the packet is 'reinserted' and no skb consume
is carried out as no clone took place.

This return type is only used in act_mirred. Rather than have the reinsert
called from the main datapath, call it directly in act_mirred. Instead of
returning TC_ACT_REINSERT, change the type to the new TC_ACT_CONSUMED
which tells the caller that the packet has been stolen by another process
and that no consume call is required.

Moving all redirect calls to the act_mirred code is in preparation for
tracking recursion created by act_mirred.

Signed-off-by: John Hurley <john.hurley@netronome.com>
Reviewed-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
John Hurley
2019-06-24 23:13:35 +01:00
committed by David S. Miller
parent 5cdda5f1d6
commit 720f22fed8
4 changed files with 5 additions and 6 deletions
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4
net/core/dev.c
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@@ -4689,9 +4689,7 @@ sch_handle_ingress(struct sk_buff *skb, struct packet_type **pt_prev, int *ret,
__skb_push(skb, skb->mac_len);
skb_do_redirect(skb);
return NULL;
case TC_ACT_REINSERT:
/* this does not scrub the packet, and updates stats on error */
skb_tc_reinsert(skb, &cl_res);
case TC_ACT_CONSUMED:
return NULL;
default:
break;