[dpdk-dev] [PATCH v2] common/mlx5: fix storing the synched MAC to internal table

[Dey, Souvik]

From: Souvik Dey <sodey at rbbn.com>

As the internal MAC table is divided into Unicast and Multicast address
sections, we should check the type of synched MAC address before storing
it to the internal table. Currently the check is not done, and the
synched MAC of 33:33:00:00:00:01 gets stored in the unicast section
(mostly index 1) causing all subsequent mlx5_set_mc_addr_list()
to fail with error -EADDRINUSE, as the mac_list contains the MAC
33:33:00:00:00:01. This denies adding of any new multicast address to
the internal list and also fails to add the MAC address to the device
in case of SR-IOV VF.

Fixes: f22442cb5d42 (�net/mlx5: reduce Netlink commands dependencies�)
Fixes: ccdcba53a3f4 (�net/mlx5: use Netlink to add/remove MAC addresses�)
Cc: stable at dpdk.org

Signed-off-by: Souvik Dey <sodey at rbbn.com>
---
v2:
* net/ -> common/
* space after mlx5:
* synched -> synched
* section -> sections
* rewording which causes -> causing 
* typo: case (to remove)
* added Fixes for LTS ML
---
 drivers/common/mlx5/linux/mlx5_nl.c | 20 +++++++++++++++-----
 1 file changed, 15 insertions(+), 5 deletions(-)

diff --git a/drivers/common/mlx5/linux/mlx5_nl.c b/drivers/common/mlx5/linux/mlx5_nl.c
index 40d8620..ef7a521 100644
--- a/drivers/common/mlx5/linux/mlx5_nl.c
+++ b/drivers/common/mlx5/linux/mlx5_nl.c
@@ -758,11 +758,21 @@ mlx5_nl_mac_addr_sync(int nlsk_fd, unsigned int iface_idx,
 				break;
 		if (j != n)
 			continue;
-		/* Find the first entry available. */
-		for (j = 0; j != n; ++j) {
-			if (rte_is_zero_ether_addr(&mac_addrs[j])) {
-				mac_addrs[j] = macs[i];
-				break;
+		if (rte_is_multicast_ether_addr(&macs[i])) {
+			/* Find the first entry available. */
+			for (j = MLX5_MAX_UC_MAC_ADDRESSES; j != n; ++j) {
+				if (rte_is_zero_ether_addr(&mac_addrs[j])) {
+					mac_addrs[j] = macs[i];
+					break;
+				}
+			}
+		} else {
+			/* Find the first entry available. */
+			for (j = 0; j != MLX5_MAX_UC_MAC_ADDRESSES; ++j) {
+				if (rte_is_zero_ether_addr(&mac_addrs[j])) {
+					mac_addrs[j] = macs[i];
+					break;
+				}
 			}
 		}
 	}
-- 
2.9.3.windows.1


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