/*
 * Copyright (C) 2015 Tobias Klauser <tklauser@distanz.ch>
 *
 * This file is part of llmnrd.
 *
 * llmnrd 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, version 2 of the License.
 *
 * llmnrd 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with llmnrd.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef LLMNR_H
#define LLMNR_H

#include <stdbool.h>
#include <stdint.h>

int llmnr_init(const char *hostname, uint16_t port, bool ipv6);
int llmnr_run(void);
void llmnr_stop(void);

#endif /* LLMNR_H */
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<tr><td class='sub'>net-next plumbings</td><td class='sub right'>Tobias Klauser</td></tr></table>
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<tr><th>author</th><td>Jack Morgenstein &lt;jackm@dev.mellanox.co.il&gt;</td><td class='right'>2016-10-27 16:27:21 +0300</td></tr>
<tr><th>committer</th><td>David S. Miller &lt;davem@davemloft.net&gt;</td><td class='right'>2016-10-29 16:23:48 -0400</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?id=d2582a03939ed0a80ffcd3ea5345505bc8067c54'>d2582a03939ed0a80ffcd3ea5345505bc8067c54</a> (<a href='/cgit.cgi/linux/net-next.git/patch/?id=d2582a03939ed0a80ffcd3ea5345505bc8067c54'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=d2582a03939ed0a80ffcd3ea5345505bc8067c54'>f15044907497f808b69cc32f0946802341cc3100</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?id=6f2e0d2c3bf0f8d322ab7516c57340c7189cca02'>6f2e0d2c3bf0f8d322ab7516c57340c7189cca02</a> (<a href='/cgit.cgi/linux/net-next.git/diff/?id=d2582a03939ed0a80ffcd3ea5345505bc8067c54&amp;id2=6f2e0d2c3bf0f8d322ab7516c57340c7189cca02'>diff</a>)</td></tr></table>
<div class='commit-subject'>net/mlx4_en: Fix potential deadlock in port statistics flow</div><div class='commit-msg'>mlx4_en_DUMP_ETH_STATS took the *counter mutex* and then
called the FW command, with WRAPPED attribute. As a result, the fw command
is wrapped on the Hypervisor when it calls mlx4_en_DUMP_ETH_STATS.
The FW command wrapper flow on the hypervisor takes the *slave_cmd_mutex*
during processing.

At the same time, a VF could be in the process of coming up, and could
call mlx4_QUERY_FUNC_CAP.  On the hypervisor, the command flow takes the
*slave_cmd_mutex*, then executes mlx4_QUERY_FUNC_CAP_wrapper.
mlx4_QUERY_FUNC_CAP wrapper calls mlx4_get_default_counter_index(),
which takes the *counter mutex*. DEADLOCK.

The fix is that the DUMP_ETH_STATS fw command should be called with
the NATIVE attribute, so that on the hypervisor, this command does not
enter the wrapper flow.

Since the Hypervisor no longer goes through the wrapper code, we also
simply return 0 in mlx4_DUMP_ETH_STATS_wrapper (i.e.the function succeeds,
but the returned data will be all zeroes).
No need to test if it is the Hypervisor going through the wrapper.

Fixes: f9baff509f8a ("mlx4_core: Add "native" argument to mlx4_cmd ...")
Signed-off-by: Jack Morgenstein &lt;jackm@dev.mellanox.co.il&gt;
Signed-off-by: Tariq Toukan &lt;tariqt@mellanox.com&gt;
Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;
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