[PATCH] igbvf: Regard vf reset nack as success

[Akihiko Odaki]

vf reset nack actually represents the reset operation itself is
performed but no address is not assigned. Therefore, e1000_reset_hw_vf
should fill the "perm_addr" with the zero address and return success on
such an occassion. This prevents its callers in netdev.c from saying PF
still resetting, and instead allows them to correctly report that no
address is assigned.

Signed-off-by: Akihiko Odaki <akihiko.odaki@xxxxxxxxxx>
---
 drivers/net/ethernet/intel/igbvf/vf.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/intel/igbvf/vf.c b/drivers/net/ethernet/intel/igbvf/vf.c
index b8ba3f94c363..2691ae2a8002 100644
--- a/drivers/net/ethernet/intel/igbvf/vf.c
+++ b/drivers/net/ethernet/intel/igbvf/vf.c
@@ -1,6 +1,8 @@
 // SPDX-License-Identifier: GPL-2.0
 /* Copyright(c) 2009 - 2018 Intel Corporation. */
 
+#include <linux/etherdevice.h>
+
 #include "vf.h"
 
 static s32 e1000_check_for_link_vf(struct e1000_hw *hw);
@@ -131,11 +133,18 @@ static s32 e1000_reset_hw_vf(struct e1000_hw *hw)
 		/* set our "perm_addr" based on info provided by PF */
 		ret_val = mbx->ops.read_posted(hw, msgbuf, 3);
 		if (!ret_val) {
-			if (msgbuf[0] == (E1000_VF_RESET |
-					  E1000_VT_MSGTYPE_ACK))
+			switch (msgbuf[0]) {
+			case E1000_VF_RESET | E1000_VT_MSGTYPE_ACK:
 				memcpy(hw->mac.perm_addr, addr, ETH_ALEN);
-			else
+				break;
+
+			case E1000_VF_RESET | E1000_VT_MSGTYPE_NACK:
+				eth_zero_addr(hw->mac.perm_addr);
+				break;
+
+			default:
 				ret_val = -E1000_ERR_MAC_INIT;
+			}
 		}
 	}
 
-- 
2.38.1