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authorAmritha Nambiar <amritha.nambiar@intel.com>2020-06-19 00:22:15 +0300
committerDavid S. Miller <davem@davemloft.net>2020-06-21 03:30:59 +0300
commit78e57f152c001eed0321ba4413a07c9e33e753e6 (patch)
treef60573a1f94c76ae442d12a3ca27130ac79a3f07 /include/net/busy_poll.h
parent8eaf8d99409009b7ab7853f3ac603928458c2022 (diff)
downloadlinux-78e57f152c001eed0321ba4413a07c9e33e753e6.tar.xz
net: Avoid overwriting valid skb->napi_id
This will be useful to allow busy poll for tunneled traffic. In case of busy poll for sessions over tunnels, the underlying physical device's queues need to be polled. Tunnels schedule NAPI either via netif_rx() for backlog queue or schedule the gro_cell_poll(). netif_rx() propagates the valid skb->napi_id to the socket. OTOH, gro_cell_poll() stamps the skb->napi_id again by calling skb_mark_napi_id() with the tunnel NAPI which is not a busy poll candidate. This was preventing tunneled traffic to use busy poll. A valid NAPI ID in the skb indicates it was already marked for busy poll by a NAPI driver and hence needs to be copied into the socket. Signed-off-by: Amritha Nambiar <amritha.nambiar@intel.com> Reviewed-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/busy_poll.h')
-rw-r--r--include/net/busy_poll.h6
1 files changed, 5 insertions, 1 deletions
diff --git a/include/net/busy_poll.h b/include/net/busy_poll.h
index 86e028388bad..b001fa91c14e 100644
--- a/include/net/busy_poll.h
+++ b/include/net/busy_poll.h
@@ -114,7 +114,11 @@ static inline void skb_mark_napi_id(struct sk_buff *skb,
struct napi_struct *napi)
{
#ifdef CONFIG_NET_RX_BUSY_POLL
- skb->napi_id = napi->napi_id;
+ /* If the skb was already marked with a valid NAPI ID, avoid overwriting
+ * it.
+ */
+ if (skb->napi_id < MIN_NAPI_ID)
+ skb->napi_id = napi->napi_id;
#endif
}