net: better skb->sender_cpu and skb->napi_id cohabitation

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skb->sender_cpu and skb->napi_id share a common storage,
and we had various bugs about this.

We had to call skb_sender_cpu_clear() in some places to
not leave a prior skb->napi_id and fool netdev_pick_tx()

As suggested by Alexei, we could split the space so that
these errors can not happen.

0 value being reserved as the common (not initialized) value,
let's reserve [1 .. NR_CPUS] range for valid sender_cpu,
and [NR_CPUS+1 .. ~0U] for valid napi_id.

This will allow proper busy polling support over tunnels.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Suggested-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

...

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Eric Dumazet 2015-11-18 06:30:50 -08:00 • committed by David S. Miller

parent d37b4c0a36

commit 52bd2d62ce

2 changed files with 16 additions and 20 deletions

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3

include/linux/skbuff.h

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33

net/core/dev.c

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