/*
 * Copyright (c) 2015 Nicira, Inc.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 */

#ifndef OVS_CONNTRACK_H
#define OVS_CONNTRACK_H 1

#include "flow.h"

struct ovs_conntrack_info;
enum ovs_key_attr;

#if IS_ENABLED(CONFIG_NF_CONNTRACK)
void ovs_ct_init(struct net *);
void ovs_ct_exit(struct net *);
bool ovs_ct_verify(struct net *, enum ovs_key_attr attr);
int ovs_ct_copy_action(struct net *, const struct nlattr *,
		       const struct sw_flow_key *, struct sw_flow_actions **,
		       bool log);
int ovs_ct_action_to_attr(const struct ovs_conntrack_info *, struct sk_buff *);

int ovs_ct_execute(struct net *, struct sk_buff *, struct sw_flow_key *,
		   const struct ovs_conntrack_info *);

void ovs_ct_fill_key(const struct sk_buff *skb, struct sw_flow_key *key);
int ovs_ct_put_key(const struct sw_flow_key *key, struct sk_buff *skb);
void ovs_ct_free_action(const struct nlattr *a);

#define CT_SUPPORTED_MASK (OVS_CS_F_NEW | OVS_CS_F_ESTABLISHED | \
			   OVS_CS_F_RELATED | OVS_CS_F_REPLY_DIR | \
			   OVS_CS_F_INVALID | OVS_CS_F_TRACKED | \
			   OVS_CS_F_SRC_NAT | OVS_CS_F_DST_NAT)
#else
#include <linux/errno.h>

static inline void ovs_ct_init(struct net *net) { }

static inline void ovs_ct_exit(struct net *net) { }

static inline bool ovs_ct_verify(struct net *net, int attr)
{
	return false;
}

static inline int ovs_ct_copy_action(struct net *net, const struct nlattr *nla,
				     const struct sw_flow_key *key,
				     struct sw_flow_actions **acts, bool log)
{
	return -ENOTSUPP;
}

static inline int ovs_ct_action_to_attr(const struct ovs_conntrack_info *info,
					struct sk_buff *skb)
{
	return -ENOTSUPP;
}

static inline int ovs_ct_execute(struct net *net, struct sk_buff *skb,
				 struct sw_flow_key *key,
				 const struct ovs_conntrack_info *info)
{
	kfree_skb(skb);
	return -ENOTSUPP;
}

static inline void ovs_ct_fill_key(const struct sk_buff *skb,
				   struct sw_flow_key *key)
{
	key->ct.state = 0;
	key->ct.zone = 0;
	key->ct.mark = 0;
	memset(&key->ct.labels, 0, sizeof(key->ct.labels));
}

static inline int ovs_ct_put_key(const struct sw_flow_key *key,
				 struct sk_buff *skb)
{
	return 0;
}

static inline void ovs_ct_free_action(const struct nlattr *a) { }

#define CT_SUPPORTED_MASK 0
#endif /* CONFIG_NF_CONNTRACK */
#endif /* ovs_conntrack.h */
='range'>range</option>
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?h=nds-private-remove&amp;id=433e19cf33d34bb6751c874a9c00980552fe508c'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net?h=nds-private-remove&amp;id=433e19cf33d34bb6751c874a9c00980552fe508c'>net</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net/bluetooth?h=nds-private-remove&amp;id=433e19cf33d34bb6751c874a9c00980552fe508c'>bluetooth</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net/bluetooth/a2mp.c?h=nds-private-remove&amp;id=433e19cf33d34bb6751c874a9c00980552fe508c'>a2mp.c</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='h' value='nds-private-remove'/><input type='hidden' name='id' value='433e19cf33d34bb6751c874a9c00980552fe508c'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</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>Dexuan Cui &lt;decui@microsoft.com&gt;</td><td class='right'>2017-01-28 11:46:02 -0700</td></tr>
<tr><th>committer</th><td>Greg Kroah-Hartman &lt;gregkh@linuxfoundation.org&gt;</td><td class='right'>2017-01-31 10:59:48 +0100</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/bluetooth/a2mp.c?h=nds-private-remove&amp;id=433e19cf33d34bb6751c874a9c00980552fe508c'>433e19cf33d34bb6751c874a9c00980552fe508c</a> (<a href='/cgit.cgi/linux/net-next.git/patch/net/bluetooth/a2mp.c?id=433e19cf33d34bb6751c874a9c00980552fe508c'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?h=nds-private-remove&amp;id=433e19cf33d34bb6751c874a9c00980552fe508c'>ce6547ef2987fbb289fa28f03536328a42781651</a> /<a href='/cgit.cgi/linux/net-next.git/tree/net/bluetooth/a2mp.c?h=nds-private-remove&amp;id=433e19cf33d34bb6751c874a9c00980552fe508c'>net/bluetooth/a2mp.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/bluetooth/a2mp.c?h=nds-private-remove&amp;id=191e885a2e130e639bb0c8ee350d7047294f2ce6'>191e885a2e130e639bb0c8ee350d7047294f2ce6</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/bluetooth/a2mp.c?h=nds-private-remove&amp;id=433e19cf33d34bb6751c874a9c00980552fe508c&amp;id2=191e885a2e130e639bb0c8ee350d7047294f2ce6'>diff</a>)</td></tr></table>
<div class='commit-subject'>Drivers: hv: vmbus: finally fix hv_need_to_signal_on_read()</div><div class='commit-msg'>Commit a389fcfd2cb5 ("Drivers: hv: vmbus: Fix signaling logic in
hv_need_to_signal_on_read()")
added the proper mb(), but removed the test "prev_write_sz &lt; pending_sz"
when making the signal decision.

As a result, the guest can signal the host unnecessarily,
and then the host can throttle the guest because the host
thinks the guest is buggy or malicious; finally the user
running stress test can perceive intermittent freeze of
the guest.

This patch brings back the test, and properly handles the
in-place consumption APIs used by NetVSC (see get_next_pkt_raw(),
put_pkt_raw() and commit_rd_index()).

Fixes: a389fcfd2cb5 ("Drivers: hv: vmbus: Fix signaling logic in
hv_need_to_signal_on_read()")

Signed-off-by: Dexuan Cui &lt;decui@microsoft.com&gt;
Reported-by: Rolf Neugebauer &lt;rolf.neugebauer@docker.com&gt;
Tested-by: Rolf Neugebauer &lt;rolf.neugebauer@docker.com&gt;
Cc: "K. Y. Srinivasan" &lt;kys@microsoft.com&gt;
Cc: Haiyang Zhang &lt;haiyangz@microsoft.com&gt;
Cc: Stephen Hemminger &lt;sthemmin@microsoft.com&gt;
Cc: &lt;stable@vger.kernel.org&gt;
Signed-off-by: K. Y. Srinivasan &lt;kys@microsoft.com&gt;
Signed-off-by: Greg Kroah-Hartman &lt;gregkh@linuxfoundation.org&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=433e19cf33d34bb6751c874a9c00980552fe508c'>Diffstat</a> (limited to 'net/bluetooth/a2mp.c')</div><table summary='diffstat' class='diffstat'>