e1000e: Failure to write SHRA turns on PROMISC mode

Previously, the check to turn on promiscuous mode only took into account
the total number of SHared Receive Address (SHRA) registers and if the
request was for a register within that range.  It is possible that the
Management Engine might have locked a number of SHRA and not allowed a
new address to be written to the requested register.

Add a function to determine the number of unlocked SHRA registers.  Then
determine if the number of registers available is sufficient for our needs,
if not then return -ENOMEM so that UNICAST PROMISC mode is activated.

Since the method by which ME claims SHRA registers is non-deterministic,
also add a return value to the function attempting to write an address
to a SHRA, and return a -E1000_ERR_CONFIG if the write fails.  The error
will be passed up the function chain and allow the driver to also set
UNICAST PROMISC when this happens.

Cc: Vlad Yasevich <vyasevic@redhat.com>
Signed-off-by: Dave Ertman <davidx.m.ertman@intel.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

1 files changed, 8 insertions, 2 deletions

diff --git a/drivers/net/ethernet/intel/e1000e/netdev.c b/drivers/net/ethernet/intel/e1000e/netdev.c
index e4207efd13f8..6084e6ba45c2 100644
--- a/drivers/net/ethernet/intel/e1000e/netdev.c
+++ b/drivers/net/ethernet/intel/e1000e/netdev.c
@@ -3311,9 +3311,11 @@ static int e1000e_write_uc_addr_list(struct net_device *netdev)
 {
 	struct e1000_adapter *adapter = netdev_priv(netdev);
 	struct e1000_hw *hw = &adapter->hw;
-	unsigned int rar_entries = hw->mac.rar_entry_count;
+	unsigned int rar_entries;
 	int count = 0;
 
+	rar_entries = hw->mac.ops.rar_get_count(hw);
+
 	/* save a rar entry for our hardware address */
 	rar_entries--;
 
@@ -3332,9 +3334,13 @@ static int e1000e_write_uc_addr_list(struct net_device *netdev)
 		 * combining
 		 */
 		netdev_for_each_uc_addr(ha, netdev) {
+			int rval;
+
 			if (!rar_entries)
 				break;
-			hw->mac.ops.rar_set(hw, ha->addr, rar_entries--);
+			rval = hw->mac.ops.rar_set(hw, ha->addr, rar_entries--);
+			if (rval < 0)
+				return -ENOMEM;
 			count++;
 		}
 	}