be2net: fix initial MAC setting

Recent commit 34393529163a ("be2net: fix MAC addr setting on privileged
BE3 VFs") allows privileged BE3 VFs to set its MAC address during
initialization. Although the initial MAC for such VFs is already
programmed by parent PF the subsequent setting performed by VF is OK,
but in certain cases (after fresh boot) this command in VF can fail.

The MAC should be initialized only when:
1) no MAC is programmed (always except BE3 VFs during first init)
2) programmed MAC is different from requested (e.g. MAC is set when
   interface is down). In this case the initial MAC programmed by PF
   needs to be deleted.

The adapter->dev_mac contains MAC address currently programmed in HW so
it should be zeroed when the MAC is deleted from HW and should not be
filled when MAC is set when interface is down in be_mac_addr_set() as
no programming is performed in this case.

Example of failure without the fix (immediately after fresh boot):

be2net 0000:01:00.0 eth0: Link is Up

...
be2net 0000:01:04.0: Emulex OneConnect(be3): VF  port 0

be2net 0000:01:04.0: opcode 59-1 failed:status 1-76
RTNETLINK answers: Input/output error

iommu: Removing device 0000:01:04.0 from group 33
...

iommu: Removing device 0000:01:04.0 from group 33
...

be2net 0000:01:04.0 eth8: Link is Up

Initialization is now OK.

v2 - Corrected the comment and condition check suggested by Suresh & Harsha

Orabug: 26403655

Fixes: 34393529163a ("be2net: fix MAC addr setting on privileged BE3 VFs")
Cc: Sathya Perla <sathya.perla@broadcom.com>
Cc: Ajit Khaparde <ajit.khaparde@broadcom.com>
Cc: Sriharsha Basavapatna <sriharsha.basavapatna@broadcom.com>
Cc: Somnath Kotur <somnath.kotur@broadcom.com>
Signed-off-by: Ivan Vecera <cera@cera.cz>
Acked-by: Sriharsha Basavapatna <sriharsha.basavapatna@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Kirtikar Kashyap <kirtikar.kashyap@oracle.com>
Reviewed-by: Reviewed-by: Jack Vogel <jack.vogel@oracle.com>

diff --git a/drivers/net/ethernet/emulex/benet/be_main.c b/drivers/net/ethernet/emulex/benet/be_main.c
index 067d0d45207ebed24fb8b0b4c89b73bfe51f83fe..0258f4aef1ea27a47338cc1535083933f0992d2e 100644 (file)
--- a/drivers/net/ethernet/emulex/benet/be_main.c
+++ b/drivers/net/ethernet/emulex/benet/be_main.c
@@ -363,8 +363,10 @@ static int be_mac_addr_set(struct net_device *netdev, void *p)
                status = -EPERM;
                goto err;
        }
-done:
+
+       /* Remember currently programmed MAC */
        ether_addr_copy(adapter->dev_mac, addr->sa_data);
+done:
        ether_addr_copy(netdev->dev_addr, addr->sa_data);
        dev_info(dev, "MAC address changed to %pM\n", addr->sa_data);
        return 0;
@@ -3501,9 +3503,12 @@ static void be_rx_qs_destroy(struct be_adapter *adapter)
 
 static void be_disable_if_filters(struct be_adapter *adapter)
 {
+       /* Don't delete MAC on BE3 VFs without FILTMGMT privilege  */
        if (!BEx_chip(adapter) || !be_virtfn(adapter) ||
-           check_privilege(adapter, BE_PRIV_FILTMGMT))
-                       be_dev_mac_del(adapter, adapter->pmac_id[0]);
+           check_privilege(adapter, BE_PRIV_FILTMGMT)) {
+               be_dev_mac_del(adapter, adapter->pmac_id[0]);
+               eth_zero_addr(adapter->dev_mac);
+       }
 
        be_clear_uc_list(adapter);
        be_clear_mc_list(adapter);
@@ -3658,12 +3663,27 @@ static int be_enable_if_filters(struct be_adapter *adapter)
        if (status)
                return status;
 
-       /* Don't add MAC on BE3 VFs without FILTMGMT privilege */
-       if (!BEx_chip(adapter) || !be_virtfn(adapter) ||
-           check_privilege(adapter, BE_PRIV_FILTMGMT)) {
+       /* Normally this condition usually true as the ->dev_mac is zeroed.
+        * But on BE3 VFs the initial MAC is pre-programmed by PF and
+        * subsequent be_dev_mac_add() can fail (after fresh boot)
+        */
+       if (!ether_addr_equal(adapter->dev_mac, adapter->netdev->dev_addr)) {
+               int old_pmac_id = -1;
+
+               /* Remember old programmed MAC if any - can happen on BE3 VF */
+               if (!is_zero_ether_addr(adapter->dev_mac))
+                       old_pmac_id = adapter->pmac_id[0];
+
                status = be_dev_mac_add(adapter, adapter->netdev->dev_addr);
                if (status)
                        return status;
+
+               /* Delete the old programmed MAC as we successfully programmed
+                * a new MAC
+                */
+               if (old_pmac_id >= 0 && old_pmac_id != adapter->pmac_id[0])
+                       be_dev_mac_del(adapter, old_pmac_id);
+
                ether_addr_copy(adapter->dev_mac, adapter->netdev->dev_addr);
        }
 
@@ -4444,6 +4464,10 @@ static int be_mac_setup(struct be_adapter *adapter)
 
                memcpy(adapter->netdev->dev_addr, mac, ETH_ALEN);
                memcpy(adapter->netdev->perm_addr, mac, ETH_ALEN);
+
+               /* Initial MAC for BE3 VFs is already programmed by PF */
+               if (BEx_chip(adapter) && be_virtfn(adapter))
+                       memcpy(adapter->dev_mac, mac, ETH_ALEN);
        }
 
        return 0;