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net: provide generic busy polling to all NAPI drivers

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NAPI drivers no longer need to observe a particular protocol
to benefit from busy polling (CONFIG_NET_RX_BUSY_POLL=y)

napi_hash_add() and napi_hash_del() are automatically called
from core networking stack, respectively from
netif_napi_add() and netif_napi_del()

This patch depends on free_netdev() and netif_napi_del() being
called from process context, which seems to be the norm.

Drivers might still prefer to call napi_hash_del() on their
own, since they might combine all the rcu grace periods into
a single one, knowing their NAPI structures lifetime, while
core networking stack has no idea of a possible combining.

Once this patch proves to not bring serious regressions,
we will cleanup drivers to either remove napi_hash_del()
or provide appropriate rcu grace periods combining.

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 06:31:03 -08:00
committed by David S. Miller
parent 34cbe27e81
commit 93d05d4a32
14 changed files with 16 additions and 20 deletions
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3
drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
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@@ -2483,9 +2483,6 @@ static int ixgbevf_alloc_q_vectors(struct ixgbevf_adapter *adapter)
q_vector->v_idx = q_idx;
netif_napi_add(adapter->netdev, &q_vector->napi,
ixgbevf_poll, 64);
#ifdef CONFIG_NET_RX_BUSY_POLL
napi_hash_add(&q_vector->napi);
#endif
adapter->q_vector[q_idx] = q_vector;
}