[RFC PATCH v8 10/16] Add a hook to intercept external buffers from NIC driver.
From: <hidden>
Date: 2010-07-29 11:04:42
Also in:
kvm, lkml
Subsystem:
networking [general], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
From: Xin Xiaohui <redacted> The hook is called in netif_receive_skb(). Signed-off-by: Xin Xiaohui <redacted> Signed-off-by: Zhao Yu <redacted> Reviewed-by: Jeff Dike <redacted> --- net/core/dev.c | 35 +++++++++++++++++++++++++++++++++++ 1 files changed, 35 insertions(+), 0 deletions(-)
diff --git a/net/core/dev.c b/net/core/dev.c
index 636f11b..4b379b1 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c@@ -2517,6 +2517,37 @@ err: EXPORT_SYMBOL(netdev_mp_port_prep); #endif +#if defined(CONFIG_MEDIATE_PASSTHRU) || defined(CONFIG_MEDIATE_PASSTHRU_MODULE) +/* Add a hook to intercept mediate passthru(zero-copy) packets, + * and insert it to the socket queue owned by mp_port specially. + */ +static inline struct sk_buff *handle_mpassthru(struct sk_buff *skb, + struct packet_type **pt_prev, + int *ret, + struct net_device *orig_dev) +{ + struct mpassthru_port *mp_port = NULL; + struct sock *sk = NULL; + + if (!dev_is_mpassthru(skb->dev)) + return skb; + mp_port = skb->dev->mp_port; + + if (*pt_prev) { + *ret = deliver_skb(skb, *pt_prev, orig_dev); + *pt_prev = NULL; + } + + sk = mp_port->sock->sk; + skb_queue_tail(&sk->sk_receive_queue, skb); + sk->sk_state_change(sk); + + return NULL; +} +#else +#define handle_mpassthru(skb, pt_prev, ret, orig_dev) (skb) +#endif + /** * netif_receive_skb - process receive buffer from network * @skb: buffer to process
@@ -2598,6 +2629,10 @@ int netif_receive_skb(struct sk_buff *skb) ncls: #endif + /* To intercept mediate passthru(zero-copy) packets here */ + skb = handle_mpassthru(skb, &pt_prev, &ret, orig_dev); + if (!skb) + goto out; skb = handle_bridge(skb, &pt_prev, &ret, orig_dev); if (!skb) goto out;
--
1.5.4.4