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net: add netif_tx_napi_add()

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netif_tx_napi_add() is a variant of netif_napi_add()

It should be used by drivers that use a napi structure
to exclusively poll TX.

We do not want to add this kind of napi in napi_hash[] in following
patches, adding generic busy polling to all NAPI drivers.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet
2015-11-18 06:31:00 -08:00
committed by David S. Miller
parent 93f93a4404
commit d64b5e85bf
12 changed files with 38 additions and 16 deletions
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3
net/core/dev.c
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@@ -4737,7 +4737,8 @@ EXPORT_SYMBOL(sk_busy_loop);
void napi_hash_add(struct napi_struct *napi)
{
if (test_and_set_bit(NAPI_STATE_HASHED, &napi->state))
if (test_bit(NAPI_STATE_NO_BUSY_POLL, &napi->state) ||
test_and_set_bit(NAPI_STATE_HASHED, &napi->state))
return;
spin_lock(&napi_hash_lock);