提交 d5e63bde 编写于 作者: D David S. Miller

Revert "af_packet: add interframe drop cmsg (v6)"

This reverts commit 97775007.

Neil is reimplementing this generically, outside of AF_PACKET.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
上级 91b2a3f9
......@@ -48,13 +48,11 @@ struct sockaddr_ll
#define PACKET_RESERVE 12
#define PACKET_TX_RING 13
#define PACKET_LOSS 14
#define PACKET_GAPDATA 15
struct tpacket_stats
{
unsigned int tp_packets;
unsigned int tp_drops;
unsigned int tp_gap;
};
struct tpacket_auxdata
......
......@@ -524,31 +524,6 @@ static inline unsigned int run_filter(struct sk_buff *skb, struct sock *sk,
return res;
}
/*
* If we've lost frames since the last time we queued one to the
* sk_receive_queue, we need to record it here.
* This must be called under the protection of the socket lock
* to prevent racing with other softirqs and user space
*/
static inline void record_packet_gap(struct sk_buff *skb,
struct packet_sock *po)
{
/*
* We overload the mark field here, since we're about
* to enqueue to a receive queue and no body else will
* use this field at this point
*/
skb->mark = po->stats.tp_gap;
po->stats.tp_gap = 0;
return;
}
static inline __u32 check_packet_gap(struct sk_buff *skb)
{
return skb->mark;
}
/*
This function makes lazy skb cloning in hope that most of packets
are discarded by BPF.
......@@ -652,7 +627,6 @@ static int packet_rcv(struct sk_buff *skb, struct net_device *dev,
spin_lock(&sk->sk_receive_queue.lock);
po->stats.tp_packets++;
record_packet_gap(skb, po);
__skb_queue_tail(&sk->sk_receive_queue, skb);
spin_unlock(&sk->sk_receive_queue.lock);
sk->sk_data_ready(sk, skb->len);
......@@ -661,7 +635,6 @@ static int packet_rcv(struct sk_buff *skb, struct net_device *dev,
drop_n_acct:
spin_lock(&sk->sk_receive_queue.lock);
po->stats.tp_drops++;
po->stats.tp_gap++;
spin_unlock(&sk->sk_receive_queue.lock);
drop_n_restore:
......@@ -839,7 +812,6 @@ static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
ring_is_full:
po->stats.tp_drops++;
po->stats.tp_gap++;
spin_unlock(&sk->sk_receive_queue.lock);
sk->sk_data_ready(sk, 0);
......@@ -1449,7 +1421,6 @@ static int packet_recvmsg(struct kiocb *iocb, struct socket *sock,
struct sk_buff *skb;
int copied, err;
struct sockaddr_ll *sll;
__u32 gap;
err = -EINVAL;
if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT))
......@@ -1528,10 +1499,6 @@ static int packet_recvmsg(struct kiocb *iocb, struct socket *sock,
put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux);
}
gap = check_packet_gap(skb);
if (gap)
put_cmsg(msg, SOL_PACKET, PACKET_GAPDATA, sizeof(__u32), &gap);
/*
* Free or return the buffer as appropriate. Again this
* hides all the races and re-entrancy issues from us.
......
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