patch 'net/mlx4: fix Verbs FD leak in secondary process' has been queued to stable release 20.11.7

[luca.boccassi at gmail.com]

Hi,

FYI, your patch has been queued to stable release 20.11.7

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 11/05/22. So please
shout if anyone has objections.

Also note that after the patch there's a diff of the upstream commit vs the
patch applied to the branch. This will indicate if there was any rebasing
needed to apply to the stable branch. If there were code changes for rebasing
(ie: not only metadata diffs), please double check that the rebase was
correctly done.

Queued patches are on a temporary branch at:
https://github.com/kevintraynor/dpdk-stable

This queued commit can be viewed at:
https://github.com/kevintraynor/dpdk-stable/commit/b0e08d7e8610334864a1269c2065eedfd96b7429

Thanks.

Luca Boccassi

---
>From b0e08d7e8610334864a1269c2065eedfd96b7429 Mon Sep 17 00:00:00 2001
From: Long Li <longli at microsoft.com>
Date: Wed, 6 Jul 2022 10:48:52 -0700
Subject: [PATCH] net/mlx4: fix Verbs FD leak in secondary process

[ upstream commit ff9c3548c05b356753a4f53bc945c625263c1ee9 ]

FDs passed from rte_mp_msg are duplicated to the secondary process and
need to be closed.

Fixes: 0203d33a10 ("net/mlx4: support secondary process")

Signed-off-by: Long Li <longli at microsoft.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo at nvidia.com>
---
 drivers/net/mlx4/mlx4.c    | 9 ++++++---
 drivers/net/mlx4/mlx4_mp.c | 7 ++++++-
 2 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/drivers/net/mlx4/mlx4.c b/drivers/net/mlx4/mlx4.c
index b35372ed64..a5e4205bcd 100644
--- a/drivers/net/mlx4/mlx4.c
+++ b/drivers/net/mlx4/mlx4.c
@@ -877,6 +877,8 @@ mlx4_pci_probe(struct rte_pci_driver *pci_drv, struct rte_pci_device *pci_dev)
 		snprintf(name, sizeof(name), "%s port %u",
 			 mlx4_glue->get_device_name(ibv_dev), port);
 		if (rte_eal_process_type() == RTE_PROC_SECONDARY) {
+			int fd;
+
 			eth_dev = rte_eth_dev_attach_secondary(name);
 			if (eth_dev == NULL) {
 				ERROR("can not attach rte ethdev");
@@ -899,13 +901,14 @@ mlx4_pci_probe(struct rte_pci_driver *pci_drv, struct rte_pci_device *pci_dev)
 			if (err)
 				goto err_secondary;
 			/* Receive command fd from primary process. */
-			err = mlx4_mp_req_verbs_cmd_fd(eth_dev);
-			if (err < 0) {
+			fd = mlx4_mp_req_verbs_cmd_fd(eth_dev);
+			if (fd < 0) {
 				err = rte_errno;
 				goto err_secondary;
 			}
 			/* Remap UAR for Tx queues. */
-			err = mlx4_tx_uar_init_secondary(eth_dev, err);
+			err = mlx4_tx_uar_init_secondary(eth_dev, fd);
+			close(fd);
 			if (err) {
 				err = rte_errno;
 				goto err_secondary;
diff --git a/drivers/net/mlx4/mlx4_mp.c b/drivers/net/mlx4/mlx4_mp.c
index dd72755252..edc3067c60 100644
--- a/drivers/net/mlx4/mlx4_mp.c
+++ b/drivers/net/mlx4/mlx4_mp.c
@@ -5,6 +5,7 @@
 
 #include <stdio.h>
 #include <time.h>
+#include <unistd.h>
 
 #include <rte_eal.h>
 #include <rte_ethdev_driver.h>
@@ -134,15 +135,19 @@ mp_secondary_handle(const struct rte_mp_msg *mp_msg, const void *peer)
 			mlx4_tx_uar_uninit_secondary(dev);
 			mlx4_proc_priv_uninit(dev);
 			ret = mlx4_proc_priv_init(dev);
-			if (ret)
+			if (ret) {
+				close(mp_msg->fds[0]);
 				return -rte_errno;
+			}
 			ret = mlx4_tx_uar_init_secondary(dev, mp_msg->fds[0]);
 			if (ret) {
+				close(mp_msg->fds[0]);
 				mlx4_proc_priv_uninit(dev);
 				return -rte_errno;
 			}
 		}
 #endif
+		close(mp_msg->fds[0]);
 		rte_mb();
 		mp_init_msg(dev, &mp_res, param->type);
 		res->result = 0;
-- 
2.34.1

---
  Diff of the applied patch vs upstream commit (please double-check if non-empty:
---
--- -	2022-11-03 09:27:27.983075885 +0000
+++ 0042-net-mlx4-fix-Verbs-FD-leak-in-secondary-process.patch	2022-11-03 09:27:25.417423292 +0000
@@ -1 +1 @@
-From ff9c3548c05b356753a4f53bc945c625263c1ee9 Mon Sep 17 00:00:00 2001
+From b0e08d7e8610334864a1269c2065eedfd96b7429 Mon Sep 17 00:00:00 2001
@@ -5,0 +6,2 @@
+[ upstream commit ff9c3548c05b356753a4f53bc945c625263c1ee9 ]
+
@@ -10 +11,0 @@
-Cc: stable at dpdk.org
@@ -20 +21 @@
-index 7e7e1824ef..a54016f4a2 100644
+index b35372ed64..a5e4205bcd 100644
@@ -51 +52 @@
-index 3282afceda..534cb31151 100644
+index dd72755252..edc3067c60 100644
@@ -54 +55,2 @@
-@@ -6,6 +6,7 @@
+@@ -5,6 +5,7 @@
+ 
@@ -56 +57,0 @@
- #include <stdlib.h>
@@ -61,2 +62,2 @@
- #include <ethdev_driver.h>
-@@ -135,15 +136,19 @@ mp_secondary_handle(const struct rte_mp_msg *mp_msg, const void *peer)
+ #include <rte_ethdev_driver.h>
+@@ -134,15 +135,19 @@ mp_secondary_handle(const struct rte_mp_msg *mp_msg, const void *peer)