/*
 * net/sched/em_nbyte.c	N-Byte ematch
 *
 *		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.
 *
 * Authors:	Thomas Graf <tgraf@suug.ch>
 */

#include <linux/gfp.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/skbuff.h>
#include <linux/tc_ematch/tc_em_nbyte.h>
#include <net/pkt_cls.h>

struct nbyte_data {
	struct tcf_em_nbyte	hdr;
	char			pattern[0];
};

static int em_nbyte_change(struct net *net, void *data, int data_len,
			   struct tcf_ematch *em)
{
	struct tcf_em_nbyte *nbyte = data;

	if (data_len < sizeof(*nbyte) ||
	    data_len < (sizeof(*nbyte) + nbyte->len))
		return -EINVAL;

	em->datalen = sizeof(*nbyte) + nbyte->len;
	em->data = (unsigned long)kmemdup(data, em->datalen, GFP_KERNEL);
	if (em->data == 0UL)
		return -ENOBUFS;

	return 0;
}

static int em_nbyte_match(struct sk_buff *skb, struct tcf_ematch *em,
			  struct tcf_pkt_info *info)
{
	struct nbyte_data *nbyte = (struct nbyte_data *) em->data;
	unsigned char *ptr = tcf_get_base_ptr(skb, nbyte->hdr.layer);

	ptr += nbyte->hdr.off;

	if (!tcf_valid_offset(skb, ptr, nbyte->hdr.len))
		return 0;

	return !memcmp(ptr + nbyte->hdr.off, nbyte->pattern, nbyte->hdr.len);
}

static struct tcf_ematch_ops em_nbyte_ops = {
	.kind	  = TCF_EM_NBYTE,
	.change	  = em_nbyte_change,
	.match	  = em_nbyte_match,
	.owner	  = THIS_MODULE,
	.link	  = LIST_HEAD_INIT(em_nbyte_ops.link)
};

static int __init init_em_nbyte(void)
{
	return tcf_em_register(&em_nbyte_ops);
}

static void __exit exit_em_nbyte(void)
{
	tcf_em_unregister(&em_nbyte_ops);
}

MODULE_LICENSE("GPL");

module_init(init_em_nbyte);
module_exit(exit_em_nbyte);

MODULE_ALIAS_TCF_EMATCH(TCF_EM_NBYTE);
&amp;id=e3426e12fee11cb7949b65428955127ca3dcb433'>tree</a><a href='/cgit.cgi/linux/net-next.git/commit/net/irda/irnet/Makefile?h=nds-private-remove&amp;id=e3426e12fee11cb7949b65428955127ca3dcb433'>commit</a><a href='/cgit.cgi/linux/net-next.git/diff/net/irda/irnet/Makefile?h=nds-private-remove&amp;id=e3426e12fee11cb7949b65428955127ca3dcb433'>diff</a></td><td class='form'><form class='right' method='get' action='/cgit.cgi/linux/net-next.git/log/net/irda/irnet/Makefile'>
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/log/?h=nds-private-remove&amp;id=e3426e12fee11cb7949b65428955127ca3dcb433'>root</a>/<a href='/cgit.cgi/linux/net-next.git/log/net?h=nds-private-remove&amp;id=e3426e12fee11cb7949b65428955127ca3dcb433'>net</a>/<a href='/cgit.cgi/linux/net-next.git/log/net/irda?h=nds-private-remove&amp;id=e3426e12fee11cb7949b65428955127ca3dcb433'>irda</a>/<a href='/cgit.cgi/linux/net-next.git/log/net/irda/irnet?h=nds-private-remove&amp;id=e3426e12fee11cb7949b65428955127ca3dcb433'>irnet</a>/<a href='/cgit.cgi/linux/net-next.git/log/net/irda/irnet/Makefile?h=nds-private-remove&amp;id=e3426e12fee11cb7949b65428955127ca3dcb433'>Makefile</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/cgit.cgi/linux/net-next.git/log/net/irda/irnet/Makefile?h=nds-private-remove&amp;id=e3426e12fee11cb7949b65428955127ca3dcb433&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th><th class='left'>Files</th><th class='left'>Lines</th></tr>
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>Steven Rostedt (VMware) &lt;rostedt@goodmis.org&gt;</td><td class='right'>2017-01-30 19:27:10 -0500</td></tr>
<tr><th>committer</th><td>Steven Rostedt (VMware) &lt;rostedt@goodmis.org&gt;</td><td class='right'>2017-01-31 09:13:49 -0500</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/misc/adutux.c?id=79c6f448c8b79c321e4a1f31f98194e4f6b6cae7'>79c6f448c8b79c321e4a1f31f98194e4f6b6cae7</a> (<a href='/cgit.cgi/linux/net-next.git/patch/drivers/usb/misc/adutux.c?id=79c6f448c8b79c321e4a1f31f98194e4f6b6cae7'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=79c6f448c8b79c321e4a1f31f98194e4f6b6cae7'>370efda701f03cccf21e02bb1fdd3b852547d75c</a> /<a href='/cgit.cgi/linux/net-next.git/tree/drivers/usb/misc/adutux.c?id=79c6f448c8b79c321e4a1f31f98194e4f6b6cae7'>drivers/usb/misc/adutux.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/drivers/usb/misc/adutux.c?id=0c744ea4f77d72b3dcebb7a8f2684633ec79be88'>0c744ea4f77d72b3dcebb7a8f2684633ec79be88</a> (<a href='/cgit.cgi/linux/net-next.git/diff/drivers/usb/misc/adutux.c?id=79c6f448c8b79c321e4a1f31f98194e4f6b6cae7&amp;id2=0c744ea4f77d72b3dcebb7a8f2684633ec79be88'>diff</a>)</td></tr></table>
<div class='commit-subject'>tracing: Fix hwlat kthread migration</div><div class='commit-msg'>The hwlat tracer creates a kernel thread at start of the tracer. It is
pinned to a single CPU and will move to the next CPU after each period of
running. If the user modifies the migration thread's affinity, it will not
change after that happens.

The original code created the thread at the first instance it was called,
but later was changed to destroy the thread after the tracer was finished,
and would not be created until the next instance of the tracer was
established. The code that initialized the affinity was only called on the
initial instantiation of the tracer. After that, it was not initialized, and
the previous affinity did not match the current newly created one, making
it appear that the user modified the thread's affinity when it did not, and
the thread failed to migrate again.

Cc: stable@vger.kernel.org
Fixes: 0330f7aa8ee6 ("tracing: Have hwlat trace migrate across tracing_cpumask CPUs")
Signed-off-by: Steven Rostedt (VMware) &lt;rostedt@goodmis.org&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=79c6f448c8b79c321e4a1f31f98194e4f6b6cae7'>Diffstat</a> (limited to 'drivers/usb/misc/adutux.c')</div><table summary='diffstat' class='diffstat'>