Commit bc0e7cf4 authored by David Howells's avatar David Howells Committed by David S. Miller
Browse files

rxrpc: Add /proc/net/rxrpc/peers to display peer list 



Add /proc/net/rxrpc/peers to display the list of peers currently active.

Signed-off-by: default avatarDavid Howells <dhowells@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent d275444c

net/rxrpc/ar-internal.h

+1 −0
Original line number Diff line number Diff line
@@ -1062,6 +1062,7 @@ void rxrpc_put_peer(struct rxrpc_peer *); 
 */

extern const struct seq_operations rxrpc_call_seq_ops;

extern const struct seq_operations rxrpc_connection_seq_ops;

extern const struct seq_operations rxrpc_peer_seq_ops;



/*

 * recvmsg.c

net/rxrpc/net_ns.c

+3 −0
Original line number Diff line number Diff line
@@ -102,6 +102,9 @@ static __net_init int rxrpc_init_net(struct net *net) 
	proc_create_net("conns", 0444, rxnet->proc_net,

			&rxrpc_connection_seq_ops,

			sizeof(struct seq_net_private));

	proc_create_net("peers", 0444, rxnet->proc_net,

			&rxrpc_peer_seq_ops,

			sizeof(struct seq_net_private));

	return 0;



err_proc:

net/rxrpc/proc.c

+126 −0
Original line number Diff line number Diff line
@@ -212,3 +212,129 @@ const struct seq_operations rxrpc_connection_seq_ops = { 
	.stop   = rxrpc_connection_seq_stop,

	.show   = rxrpc_connection_seq_show,

};



/*

 * generate a list of extant virtual peers in /proc/net/rxrpc/peers

 */

static int rxrpc_peer_seq_show(struct seq_file *seq, void *v)

{

	struct rxrpc_peer *peer;

	time64_t now;

	char lbuff[50], rbuff[50];



	if (v == SEQ_START_TOKEN) {

		seq_puts(seq,

			 "Proto Local                                          "

			 " Remote                                         "

			 " Use CW  MTU   LastUse          RTT Rc\n"

			 );

		return 0;

	}



	peer = list_entry(v, struct rxrpc_peer, hash_link);



	sprintf(lbuff, "%pISpc", &peer->local->srx.transport);



	sprintf(rbuff, "%pISpc", &peer->srx.transport);



	now = ktime_get_seconds();

	seq_printf(seq,

		   "UDP   %-47.47s %-47.47s %3u"

		   " %3u %5u %6llus %12llu %2u\n",

		   lbuff,

		   rbuff,

		   atomic_read(&peer->usage),

		   peer->cong_cwnd,

		   peer->mtu,

		   now - peer->last_tx_at,

		   peer->rtt,

		   peer->rtt_cursor);



	return 0;

}



static void *rxrpc_peer_seq_start(struct seq_file *seq, loff_t *_pos)

	__acquires(rcu)

{

	struct rxrpc_net *rxnet = rxrpc_net(seq_file_net(seq));

	unsigned int bucket, n;

	unsigned int shift = 32 - HASH_BITS(rxnet->peer_hash);

	void *p;



	rcu_read_lock();



	if (*_pos >= UINT_MAX)

		return NULL;



	n = *_pos & ((1U << shift) - 1);

	bucket = *_pos >> shift;

	for (;;) {

		if (bucket >= HASH_SIZE(rxnet->peer_hash)) {

			*_pos = UINT_MAX;

			return NULL;

		}

		if (n == 0) {

			if (bucket == 0)

				return SEQ_START_TOKEN;

			*_pos += 1;

			n++;

		}



		p = seq_hlist_start_rcu(&rxnet->peer_hash[bucket], n - 1);

		if (p)

			return p;

		bucket++;

		n = 1;

		*_pos = (bucket << shift) | n;

	}

}



static void *rxrpc_peer_seq_next(struct seq_file *seq, void *v, loff_t *_pos)

{

	struct rxrpc_net *rxnet = rxrpc_net(seq_file_net(seq));

	unsigned int bucket, n;

	unsigned int shift = 32 - HASH_BITS(rxnet->peer_hash);

	void *p;



	if (*_pos >= UINT_MAX)

		return NULL;



	bucket = *_pos >> shift;



	p = seq_hlist_next_rcu(v, &rxnet->peer_hash[bucket], _pos);

	if (p)

		return p;



	for (;;) {

		bucket++;

		n = 1;

		*_pos = (bucket << shift) | n;



		if (bucket >= HASH_SIZE(rxnet->peer_hash)) {

			*_pos = UINT_MAX;

			return NULL;

		}

		if (n == 0) {

			*_pos += 1;

			n++;

		}



		p = seq_hlist_start_rcu(&rxnet->peer_hash[bucket], n - 1);

		if (p)

			return p;

	}

}



static void rxrpc_peer_seq_stop(struct seq_file *seq, void *v)

	__releases(rcu)

{

	rcu_read_unlock();

}





const struct seq_operations rxrpc_peer_seq_ops = {

	.start  = rxrpc_peer_seq_start,

	.next   = rxrpc_peer_seq_next,

	.stop   = rxrpc_peer_seq_stop,

	.show   = rxrpc_peer_seq_show,

};