[PATCH 4.19 15/47] be2net: fix link failure after ethtool offline test

[Greg Kroah-Hartman]

[ Upstream commit 2e5db6eb3c23e5dc8171eb8f6af7a97ef9fcf3a9 ]

Certain cards in conjunction with certain switches need a little more
time for link setup that results in ethtool link test failure after
offline test. Patch adds a loop that waits for a link setup finish.

Changes in v2:
- added fixes header

Fixes: 4276e47e2d1c ("be2net: Add link test to list of ethtool self tests.")
Signed-off-by: Petr Oros <po...@redhat.com>
Reviewed-by: Ivan Vecera <ivec...@redhat.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
 .../net/ethernet/emulex/benet/be_ethtool.c    | 28 +++++++++++++++----
 1 file changed, 22 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/emulex/benet/be_ethtool.c 
b/drivers/net/ethernet/emulex/benet/be_ethtool.c
index bfb16a474490..d1905d50c26c 100644
--- a/drivers/net/ethernet/emulex/benet/be_ethtool.c
+++ b/drivers/net/ethernet/emulex/benet/be_ethtool.c
@@ -895,7 +895,7 @@ static void be_self_test(struct net_device *netdev, struct 
ethtool_test *test,
                         u64 *data)
 {
        struct be_adapter *adapter = netdev_priv(netdev);
-       int status;
+       int status, cnt;
        u8 link_status = 0;
 
        if (adapter->function_caps & BE_FUNCTION_CAPS_SUPER_NIC) {
@@ -906,6 +906,9 @@ static void be_self_test(struct net_device *netdev, struct 
ethtool_test *test,
 
        memset(data, 0, sizeof(u64) * ETHTOOL_TESTS_NUM);
 
+       /* check link status before offline tests */
+       link_status = netif_carrier_ok(netdev);
+
        if (test->flags & ETH_TEST_FL_OFFLINE) {
                if (be_loopback_test(adapter, BE_MAC_LOOPBACK, &data[0]) != 0)
                        test->flags |= ETH_TEST_FL_FAILED;
@@ -926,13 +929,26 @@ static void be_self_test(struct net_device *netdev, 
struct ethtool_test *test,
                test->flags |= ETH_TEST_FL_FAILED;
        }
 
-       status = be_cmd_link_status_query(adapter, NULL, &link_status, 0);
-       if (status) {
-               test->flags |= ETH_TEST_FL_FAILED;
-               data[4] = -1;
-       } else if (!link_status) {
+       /* link status was down prior to test */
+       if (!link_status) {
                test->flags |= ETH_TEST_FL_FAILED;
                data[4] = 1;
+               return;
+       }
+
+       for (cnt = 10; cnt; cnt--) {
+               status = be_cmd_link_status_query(adapter, NULL, &link_status,
+                                                 0);
+               if (status) {
+                       test->flags |= ETH_TEST_FL_FAILED;
+                       data[4] = -1;
+                       break;
+               }
+
+               if (link_status)
+                       break;
+
+               msleep_interruptible(500);
        }
 }
 
-- 
2.20.1