RDMA/nes: Fix MAC interrupt erroneously masked on ifdown

Only mask out MAC interrupt if necessary and re-enable on ifup.  There
could be multiple netdevs going through the same MAC.  MAC interrupts
should not be masked off until the last netdev is downed.

Signed-off-by: Chien Tung <ctung@neteffect.com>
Signed-off-by: Glenn Streiff <gstreiff@neteffect.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

drivers/infiniband/hw/nes/nes_nic.c

@@ -148,14 +148,15 @@ static int nes_netdev_open(struct net_device *netdev)
 	struct nes_device *nesdev = nesvnic->nesdev;
 	int ret;
 	int i;
-	struct nes_vnic *first_nesvnic;
+	struct nes_vnic *first_nesvnic = NULL;
 	u32 nic_active_bit;
 	u32 nic_active;
+	struct list_head *list_pos, *list_temp;
 
 	assert(nesdev != NULL);
 
-	first_nesvnic = list_entry(nesdev->nesadapter->nesvnic_list[nesdev->mac_index].next,
-			struct nes_vnic, list);
+	if (nesvnic->netdev_open == 1)
+		return 0;
 
 	if (netif_msg_ifup(nesvnic))
 		printk(KERN_INFO PFX "%s: enabling interface\n", netdev->name);
@@ -225,7 +226,18 @@ static int nes_netdev_open(struct net_device *netdev)
 	nes_write32(nesdev->regs+NES_CQE_ALLOC, NES_CQE_ALLOC_NOTIFY_NEXT |
 			nesvnic->nic_cq.cq_number);
 	nes_read32(nesdev->regs+NES_CQE_ALLOC);
-
+	list_for_each_safe(list_pos, list_temp, &nesdev->nesadapter->nesvnic_list[nesdev->mac_index]) {
+		first_nesvnic = container_of(list_pos, struct nes_vnic, list);
+		if (first_nesvnic->netdev_open == 1)
+			break;
+	}
+	if (first_nesvnic->netdev_open == 0) {
+		nes_debug(NES_DBG_INIT, "Setting up MAC interrupt mask.\n");
+		nes_write_indexed(nesdev, NES_IDX_MAC_INT_MASK + (0x200 * nesdev->mac_index),
+				~(NES_MAC_INT_LINK_STAT_CHG | NES_MAC_INT_XGMII_EXT |
+				NES_MAC_INT_TX_UNDERFLOW | NES_MAC_INT_TX_ERROR));
+		first_nesvnic = nesvnic;
+	}
 	if (first_nesvnic->linkup) {
 		/* Enable network packets */
 		nesvnic->linkup = 1;
@@ -248,6 +260,8 @@ static int nes_netdev_stop(struct net_device *netdev)
 	struct nes_device *nesdev = nesvnic->nesdev;
 	u32 nic_active_mask;
 	u32 nic_active;
+	struct nes_vnic *first_nesvnic = NULL;
+	struct list_head *list_pos, *list_temp;
 
 	nes_debug(NES_DBG_SHUTDOWN, "nesvnic=%p, nesdev=%p, netdev=%p %s\n",
 			nesvnic, nesdev, netdev, netdev->name);
@@ -260,9 +274,20 @@ static int nes_netdev_stop(struct net_device *netdev)
 	/* Disable network packets */
 	napi_disable(&nesvnic->napi);
 	netif_stop_queue(netdev);
-	if ((nesdev->netdev[0] == netdev) & (nesvnic->logical_port == nesdev->mac_index)) {
-		nes_write_indexed(nesdev,
-				NES_IDX_MAC_INT_MASK+(0x200*nesdev->mac_index), 0xffffffff);
+	list_for_each_safe(list_pos, list_temp, &nesdev->nesadapter->nesvnic_list[nesdev->mac_index]) {
+		first_nesvnic = container_of(list_pos, struct nes_vnic, list);
+		if ((first_nesvnic->netdev_open == 1) && (first_nesvnic != nesvnic))
+			break;
+	}
+
+	if (first_nesvnic->netdev_open == 0)
+		nes_write_indexed(nesdev, NES_IDX_MAC_INT_MASK+(0x200*nesdev->mac_index), 0xffffffff);
+	else if ((first_nesvnic != nesvnic) &&
+		 (PCI_FUNC(first_nesvnic->nesdev->pcidev->devfn) != PCI_FUNC(nesvnic->nesdev->pcidev->devfn))) {
+		nes_write_indexed(nesdev, NES_IDX_MAC_INT_MASK + (0x200 * nesdev->mac_index), 0xffffffff);
+		nes_write_indexed(first_nesvnic->nesdev, NES_IDX_MAC_INT_MASK + (0x200 * first_nesvnic->nesdev->mac_index),
+				~(NES_MAC_INT_LINK_STAT_CHG | NES_MAC_INT_XGMII_EXT |
+				NES_MAC_INT_TX_UNDERFLOW | NES_MAC_INT_TX_ERROR));
 	}
 
 	nic_active_mask = ~((u32)(1 << nesvnic->nic_index));
@@ -859,7 +884,6 @@ void nes_netdev_set_multicast_list(struct net_device *netdev)
 		for (mc_index=0; mc_index < NES_MULTICAST_PF_MAX; mc_index++) {
 			while (multicast_addr && nesvnic->mcrq_mcast_filter && ((mc_nic_index = nesvnic->mcrq_mcast_filter(nesvnic, multicast_addr->dmi_addr)) == 0))
 				multicast_addr = multicast_addr->next;
-
 			if (mc_nic_index < 0)
 				mc_nic_index = nesvnic->nic_index;
 			if (multicast_addr) {
@@ -1610,7 +1634,7 @@ struct net_device *nes_netdev_init(struct nes_device *nesdev,
 	list_add_tail(&nesvnic->list, &nesdev->nesadapter->nesvnic_list[nesdev->mac_index]);
 
 	if ((nesdev->netdev_count == 0) &&
-			(PCI_FUNC(nesdev->pcidev->devfn) == nesdev->mac_index)) {
+	    (PCI_FUNC(nesdev->pcidev->devfn) == nesdev->mac_index)) {
 		nes_debug(NES_DBG_INIT, "Setting up PHY interrupt mask. Using register index 0x%04X\n",
 				NES_IDX_PHY_PCS_CONTROL_STATUS0+(0x200*(nesvnic->logical_port&1)));
 		u32temp = nes_read_indexed(nesdev, NES_IDX_PHY_PCS_CONTROL_STATUS0 +
@@ -1648,18 +1672,14 @@ struct net_device *nes_netdev_init(struct nes_device *nesdev,
 				nesvnic->linkup = 1;
 			}
 		}
-		nes_debug(NES_DBG_INIT, "Setting up MAC interrupt mask.\n");
 		/* clear the MAC interrupt status, assumes direct logical to physical mapping */
-		u32temp = nes_read_indexed(nesdev, NES_IDX_MAC_INT_STATUS+(0x200*nesvnic->logical_port));
+		u32temp = nes_read_indexed(nesdev, NES_IDX_MAC_INT_STATUS + (0x200 * nesdev->mac_index));
 		nes_debug(NES_DBG_INIT, "Phy interrupt status = 0x%X.\n", u32temp);
-		nes_write_indexed(nesdev, NES_IDX_MAC_INT_STATUS+(0x200*nesvnic->logical_port), u32temp);
+		nes_write_indexed(nesdev, NES_IDX_MAC_INT_STATUS + (0x200 * nesdev->mac_index), u32temp);
 
-		if (nesdev->nesadapter->phy_type[nesvnic->logical_port] != NES_PHY_TYPE_IRIS)
+		if (nesdev->nesadapter->phy_type[nesdev->mac_index] != NES_PHY_TYPE_IRIS)
 			nes_init_phy(nesdev);
 
-		nes_write_indexed(nesdev, NES_IDX_MAC_INT_MASK+(0x200*nesvnic->logical_port),
-				~(NES_MAC_INT_LINK_STAT_CHG | NES_MAC_INT_XGMII_EXT |
-				NES_MAC_INT_TX_UNDERFLOW | NES_MAC_INT_TX_ERROR));
 	}
 
 	return netdev;