[PATCH net v3] nfp: clean mc addresses in application firmware when closing port

[Louis Peens <louis.peens@corigine.com>]

From: Yinjun Zhang <yinjun.zhang@corigine.com>

When moving devices from one namespace to another, mc addresses are
cleaned in software while not removed from application firmware. Thus
the mc addresses are remained and will cause resource leak.

Now use `__dev_mc_unsync` to clean mc addresses when closing port.

Fixes: e20aa071cd95 ("nfp: fix schedule in atomic context when sync mc address")
Cc: stable@vger.kernel.org
Signed-off-by: Yinjun Zhang <yinjun.zhang@corigine.com>
Acked-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: Louis Peens <louis.peens@corigine.com>
---
Changes since v2:
* Use function prototype to avoid moving code chunk.

Changes since v1:

* Use __dev_mc_unsyc to clean mc addresses instead of tracking mc addresses by
  driver itself.
* Clean mc addresses when closing port instead of driver exits,
  so that the issue of moving devices between namespaces can be fixed.
* Modify commit message accordingly.

 drivers/net/ethernet/netronome/nfp/nfp_net_common.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
index 49f2f081ebb5..6b1fb5708434 100644
--- a/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
+++ b/drivers/net/ethernet/netronome/nfp/nfp_net_common.c
@@ -53,6 +53,8 @@
 #include "crypto/crypto.h"
 #include "crypto/fw.h"
 
+static int nfp_net_mc_unsync(struct net_device *netdev, const unsigned char *addr);
+
 /**
  * nfp_net_get_fw_version() - Read and parse the FW version
  * @fw_ver:	Output fw_version structure to read to
@@ -1084,6 +1086,9 @@ static int nfp_net_netdev_close(struct net_device *netdev)
 
 	/* Step 2: Tell NFP
 	 */
+	if (nn->cap_w1 & NFP_NET_CFG_CTRL_MCAST_FILTER)
+		__dev_mc_unsync(netdev, nfp_net_mc_unsync);
+
 	nfp_net_clear_config_and_disable(nn);
 	nfp_port_configure(netdev, false);
 
-- 
2.34.1