/* ar-skbuff.c: socket buffer destruction handling
 *
 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/net.h>
#include <linux/skbuff.h>
#include <net/sock.h>
#include <net/af_rxrpc.h>
#include "ar-internal.h"

#define select_skb_count(op) (op >= rxrpc_skb_tx_cleaned ? &rxrpc_n_tx_skbs : &rxrpc_n_rx_skbs)

/*
 * Note the allocation or reception of a socket buffer.
 */
void rxrpc_new_skb(struct sk_buff *skb, enum rxrpc_skb_trace op)
{
	const void *here = __builtin_return_address(0);
	int n = atomic_inc_return(select_skb_count(op));
	trace_rxrpc_skb(skb, op, atomic_read(&skb->users), n, here);
}

/*
 * Note the re-emergence of a socket buffer from a queue or buffer.
 */
void rxrpc_see_skb(struct sk_buff *skb, enum rxrpc_skb_trace op)
{
	const void *here = __builtin_return_address(0);
	if (skb) {
		int n = atomic_read(select_skb_count(op));
		trace_rxrpc_skb(skb, op, atomic_read(&skb->users), n, here);
	}
}

/*
 * Note the addition of a ref on a socket buffer.
 */
void rxrpc_get_skb(struct sk_buff *skb, enum rxrpc_skb_trace op)
{
	const void *here = __builtin_return_address(0);
	int n = atomic_inc_return(select_skb_count(op));
	trace_rxrpc_skb(skb, op, atomic_read(&skb->users), n, here);
	skb_get(skb);
}

/*
 * Note the destruction of a socket buffer.
 */
void rxrpc_free_skb(struct sk_buff *skb, enum rxrpc_skb_trace op)
{
	const void *here = __builtin_return_address(0);
	if (skb) {
		int n;
		CHECK_SLAB_OKAY(&skb->users);
		n = atomic_dec_return(select_skb_count(op));
		trace_rxrpc_skb(skb, op, atomic_read(&skb->users), n, here);
		kfree_skb(skb);
	}
}

/*
 * Note the injected loss of a socket buffer.
 */
void rxrpc_lose_skb(struct sk_buff *skb, enum rxrpc_skb_trace op)
{
	const void *here = __builtin_return_address(0);
	if (skb) {
		int n;
		CHECK_SLAB_OKAY(&skb->users);
		n = atomic_dec_return(select_skb_count(op));
		trace_rxrpc_skb(skb, op, atomic_read(&skb->users), n, here);
		kfree_skb(skb);
	}
}

/*
 * Clear a queue of socket buffers.
 */
void rxrpc_purge_queue(struct sk_buff_head *list)
{
	const void *here = __builtin_return_address(0);
	struct sk_buff *skb;
	while ((skb = skb_dequeue((list))) != NULL) {
		int n = atomic_dec_return(select_skb_count(rxrpc_skb_rx_purged));
		trace_rxrpc_skb(skb, rxrpc_skb_rx_purged,
				atomic_read(&skb->users), n, here);
		kfree_skb(skb);
	}
}
ntext:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-01-18 11:19:32 -0800</td></tr>
<tr><th>committer</th><td>Linus Torvalds &lt;torvalds@linux-foundation.org&gt;</td><td class='right'>2017-01-18 11:19:32 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?id=fa19a769f82fb9a5ca000b83cacd13fcaeda51ac'>fa19a769f82fb9a5ca000b83cacd13fcaeda51ac</a> (<a href='/cgit.cgi/linux/net-next.git/patch/?id=fa19a769f82fb9a5ca000b83cacd13fcaeda51ac'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=fa19a769f82fb9a5ca000b83cacd13fcaeda51ac'>f8fca436f994c67d992accea8987ce40bd282bed</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?id=ca92e6c7e6329029d7188487a5c32e86ef471977'>ca92e6c7e6329029d7188487a5c32e86ef471977</a> (<a href='/cgit.cgi/linux/net-next.git/diff/?id=fa19a769f82fb9a5ca000b83cacd13fcaeda51ac&amp;id2=ca92e6c7e6329029d7188487a5c32e86ef471977'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?id=90f92c631b210c1e97080b53a9d863783281a932'>90f92c631b210c1e97080b53a9d863783281a932</a> (<a href='/cgit.cgi/linux/net-next.git/diff/?id=fa19a769f82fb9a5ca000b83cacd13fcaeda51ac&amp;id2=90f92c631b210c1e97080b53a9d863783281a932'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge branch 'fixes' of git://git.armlinux.org.uk/~rmk/linux-arm</div><div class='commit-msg'>Pull ARM fixes from Russell King:
 "A few ARM fixes:

   - fix a crash while performing TLB maintanence on early ARM SMP cores

   - blacklist Scorpion CPUs for hardware breakpoints

   - ARMs asm/types.h has been included as part of the UAPI due to the
     way the makefiles work, move it to uapi/asm/types.h to make it
     official

   - fix up ftrace syscall name matching"

* 'fixes' of git://git.armlinux.org.uk/~rmk/linux-arm:
  ARM: 8613/1: Fix the uaccess crash on PB11MPCore
  MAINTAINERS: update rmk's entries
  ARM: put types.h in uapi
  ARM: 8634/1: hw_breakpoint: blacklist Scorpion CPUs
  ARM: 8632/1: ftrace: fix syscall name matching
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=fa19a769f82fb9a5ca000b83cacd13fcaeda51ac'>Diffstat</a></div><table summary='diffstat' class='diffstat'>