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Commit d5e63bde authored by David S. Miller's avatar David S. Miller
Browse files

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



This reverts commit 97775007.

Neil is reimplementing this generically, outside of AF_PACKET.

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 91b2a3f9

include/linux/if_packet.h

+0 −2
Original line number Diff line number Diff line
@@ -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

net/packet/af_packet.c

+0 −33
Original line number Diff line number Diff line
@@ -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 @@ drop: 


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.