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Commit 889b8f96 authored by David S. Miller's avatar David S. Miller
Browse files

packet: Kill CONFIG_PACKET_MMAP. 



Early on this was an experimental facility that few
people other than Alexey Kuznetsov played with.

Now it's a pretty fundamental thing and as people add
more features to AF_PACKET sockets this config options
creates ifdef spaghetti.

So kill it off.

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 7aeef972

Documentation/networking/packet_mmap.txt

+4 −4
Original line number Diff line number Diff line
@@ -2,7 +2,7 @@ 
+ ABSTRACT

--------------------------------------------------------------------------------



This file documents the CONFIG_PACKET_MMAP option available with the PACKET

This file documents the mmap() facility available with the PACKET

socket interface on 2.4 and 2.6 kernels. This type of sockets is used for 

capture network traffic with utilities like tcpdump or any other that needs

raw access to network interface.
@@ -44,7 +44,7 @@ enabled. For transmission, check the MTU (Maximum Transmission Unit) used and 
supported by devices of your network.



--------------------------------------------------------------------------------

+ How to use CONFIG_PACKET_MMAP to improve capture process

+ How to use mmap() to improve capture process

--------------------------------------------------------------------------------



From the user standpoint, you should use the higher level libpcap library, which
@@ -64,7 +64,7 @@ the low level details or want to improve libpcap by including PACKET_MMAP 
support.



--------------------------------------------------------------------------------

+ How to use CONFIG_PACKET_MMAP directly to improve capture process

+ How to use mmap() directly to improve capture process

--------------------------------------------------------------------------------



From the system calls stand point, the use of PACKET_MMAP involves
@@ -105,7 +105,7 @@ also the mapping of the circular buffer in the user process and 
the use of this buffer.



--------------------------------------------------------------------------------

+ How to use CONFIG_PACKET_MMAP directly to improve transmission process

+ How to use mmap() directly to improve transmission process

--------------------------------------------------------------------------------

Transmission process is similar to capture as shown below.

net/packet/Kconfig

+0 −10
Original line number Diff line number Diff line
@@ -14,13 +14,3 @@ config PACKET 
	  be called af_packet.



	  If unsure, say Y.
 


config PACKET_MMAP

	bool "Packet socket: mmapped IO"

	depends on PACKET

	help

	  If you say Y here, the Packet protocol driver will use an IO

	  mechanism that results in faster communication.



	  If unsure, say N.

net/packet/af_packet.c

+0 −29
Original line number Diff line number Diff line
@@ -157,7 +157,6 @@ struct packet_mreq_max { 
	unsigned char	mr_address[MAX_ADDR_LEN];

};



#ifdef CONFIG_PACKET_MMAP

static int packet_set_ring(struct sock *sk, struct tpacket_req *req,

		int closing, int tx_ring);
@@ -177,7 +176,6 @@ struct packet_ring_buffer { 


struct packet_sock;

static int tpacket_snd(struct packet_sock *po, struct msghdr *msg);

#endif



static void packet_flush_mclist(struct sock *sk);
@@ -185,11 +183,9 @@ struct packet_sock { 
	/* struct sock has to be the first member of packet_sock */

	struct sock		sk;

	struct tpacket_stats	stats;

#ifdef CONFIG_PACKET_MMAP

	struct packet_ring_buffer	rx_ring;

	struct packet_ring_buffer	tx_ring;

	int			copy_thresh;

#endif

	spinlock_t		bind_lock;

	struct mutex		pg_vec_lock;

	unsigned int		running:1,	/* prot_hook is attached*/
@@ -199,13 +195,11 @@ struct packet_sock { 
	int			ifindex;	/* bound device		*/

	__be16			num;

	struct packet_mclist	*mclist;

#ifdef CONFIG_PACKET_MMAP

	atomic_t		mapped;

	enum tpacket_versions	tp_version;

	unsigned int		tp_hdrlen;

	unsigned int		tp_reserve;

	unsigned int		tp_loss:1;

#endif

	struct packet_type	prot_hook ____cacheline_aligned_in_smp;

};
@@ -219,8 +213,6 @@ struct packet_skb_cb { 


#define PACKET_SKB_CB(__skb)	((struct packet_skb_cb *)((__skb)->cb))



#ifdef CONFIG_PACKET_MMAP



static void __packet_set_status(struct packet_sock *po, void *frame, int status)

{

	union {
@@ -315,8 +307,6 @@ static inline void packet_increment_head(struct packet_ring_buffer *buff) 
	buff->head = buff->head != buff->frame_max ? buff->head+1 : 0;

}



#endif



static inline struct packet_sock *pkt_sk(struct sock *sk)

{

	return (struct packet_sock *)sk;
@@ -640,7 +630,6 @@ static int packet_rcv(struct sk_buff *skb, struct net_device *dev, 
	return 0;

}



#ifdef CONFIG_PACKET_MMAP

static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,

		       struct packet_type *pt, struct net_device *orig_dev)

{
@@ -1056,7 +1045,6 @@ static int tpacket_snd(struct packet_sock *po, struct msghdr *msg) 
	mutex_unlock(&po->pg_vec_lock);

	return err;

}

#endif



static inline struct sk_buff *packet_alloc_skb(struct sock *sk, size_t prepad,

					       size_t reserve, size_t len,
@@ -1248,13 +1236,11 @@ static int packet_snd(struct socket *sock, 
static int packet_sendmsg(struct kiocb *iocb, struct socket *sock,

		struct msghdr *msg, size_t len)

{

#ifdef CONFIG_PACKET_MMAP

	struct sock *sk = sock->sk;

	struct packet_sock *po = pkt_sk(sk);

	if (po->tx_ring.pg_vec)

		return tpacket_snd(po, msg);

	else

#endif

		return packet_snd(sock, msg, len);

}
@@ -1268,9 +1254,7 @@ static int packet_release(struct socket *sock) 
	struct sock *sk = sock->sk;

	struct packet_sock *po;

	struct net *net;

#ifdef CONFIG_PACKET_MMAP

	struct tpacket_req req;

#endif



	if (!sk)

		return 0;
@@ -1299,7 +1283,6 @@ static int packet_release(struct socket *sock) 


	packet_flush_mclist(sk);



#ifdef CONFIG_PACKET_MMAP

	memset(&req, 0, sizeof(req));



	if (po->rx_ring.pg_vec)
@@ -1307,7 +1290,6 @@ static int packet_release(struct socket *sock) 


	if (po->tx_ring.pg_vec)

		packet_set_ring(sk, &req, 1, 1);

#endif



	/*

	 *	Now the socket is dead. No more input will appear.
@@ -1872,7 +1854,6 @@ packet_setsockopt(struct socket *sock, int level, int optname, char __user *optv 
		return ret;

	}



#ifdef CONFIG_PACKET_MMAP

	case PACKET_RX_RING:

	case PACKET_TX_RING:

	{
@@ -1943,7 +1924,6 @@ packet_setsockopt(struct socket *sock, int level, int optname, char __user *optv 
		po->tp_loss = !!val;

		return 0;

	}

#endif

	case PACKET_AUXDATA:

	{

		int val;
@@ -2041,7 +2021,6 @@ static int packet_getsockopt(struct socket *sock, int level, int optname, 


		data = &val;

		break;

#ifdef CONFIG_PACKET_MMAP

	case PACKET_VERSION:

		if (len > sizeof(int))

			len = sizeof(int);
@@ -2077,7 +2056,6 @@ static int packet_getsockopt(struct socket *sock, int level, int optname, 
		val = po->tp_loss;

		data = &val;

		break;

#endif

	default:

		return -ENOPROTOOPT;

	}
@@ -2197,11 +2175,6 @@ static int packet_ioctl(struct socket *sock, unsigned int cmd, 
	return 0;

}



#ifndef CONFIG_PACKET_MMAP

#define packet_mmap sock_no_mmap

#define packet_poll datagram_poll

#else



static unsigned int packet_poll(struct file *file, struct socket *sock,

				poll_table *wait)

{
@@ -2483,8 +2456,6 @@ static int packet_mmap(struct file *file, struct socket *sock, 
	mutex_unlock(&po->pg_vec_lock);

	return err;

}

#endif





static const struct proto_ops packet_ops_spkt = {

	.family =	PF_PACKET,