IB/mlx4: Do IBoE GID table resets per-port

The IBoE code used to reset the GID table did it for all Ethernet
ports of the device.  Since the whole architecture of generating GIDs
and responding to events is port-based, this is inefficient and can
lead to wrong content in the GID table.  Change the reset flow to be
per-port.
Signed-off-by: Moni Shoua <monis@mellanox.co.il>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>

drivers/infiniband/hw/mlx4/main.c

@@ -1408,7 +1408,6 @@ static void reset_gids_task(struct work_struct *work)
 	struct mlx4_cmd_mailbox *mailbox;
 	union ib_gid *gids;
 	int err;
-	int i;
 	struct mlx4_dev	*dev = gw->dev->dev;
 
 	mailbox = mlx4_alloc_cmd_mailbox(dev);
@@ -1420,18 +1419,16 @@ static void reset_gids_task(struct work_struct *work)
 	gids = mailbox->buf;
 	memcpy(gids, gw->gids, sizeof(gw->gids));
 
-	for (i = 1; i < gw->dev->num_ports + 1; i++) {
-		if (mlx4_ib_port_link_layer(&gw->dev->ib_dev, i) ==
-					    IB_LINK_LAYER_ETHERNET) {
-			err = mlx4_cmd(dev, mailbox->dma,
-				       MLX4_SET_PORT_GID_TABLE << 8 | i,
-				       1, MLX4_CMD_SET_PORT,
-				       MLX4_CMD_TIME_CLASS_B,
-				       MLX4_CMD_WRAPPED);
-			if (err)
-				pr_warn(KERN_WARNING
-					"set port %d command failed\n", i);
-		}
+	if (mlx4_ib_port_link_layer(&gw->dev->ib_dev, gw->port) ==
+				    IB_LINK_LAYER_ETHERNET) {
+		err = mlx4_cmd(dev, mailbox->dma,
+			       MLX4_SET_PORT_GID_TABLE << 8 | gw->port,
+			       1, MLX4_CMD_SET_PORT,
+			       MLX4_CMD_TIME_CLASS_B,
+			       MLX4_CMD_WRAPPED);
+		if (err)
+			pr_warn(KERN_WARNING
+				"set port %d command failed\n", gw->port);
 	}
 
 	mlx4_free_cmd_mailbox(dev, mailbox);
@@ -1506,7 +1503,7 @@ static void mlx4_make_default_gid(struct  net_device *dev, union ib_gid *gid)
 }
 
 
-static int reset_gid_table(struct mlx4_ib_dev *dev)
+static int reset_gid_table(struct mlx4_ib_dev *dev, u8 port)
 {
 	struct update_gid_work *work;
 
@@ -1514,10 +1511,12 @@ static int reset_gid_table(struct mlx4_ib_dev *dev)
 	work = kzalloc(sizeof(*work), GFP_ATOMIC);
 	if (!work)
 		return -ENOMEM;
-	memset(dev->iboe.gid_table, 0, sizeof(dev->iboe.gid_table));
+
+	memset(dev->iboe.gid_table[port - 1], 0, sizeof(work->gids));
 	memset(work->gids, 0, sizeof(work->gids));
 	INIT_WORK(&work->work, reset_gids_task);
 	work->dev = dev;
+	work->port = port;
 	queue_work(wq, &work->work);
 	return 0;
 }
@@ -1670,9 +1669,11 @@ static int mlx4_ib_init_gid_table(struct mlx4_ib_dev *ibdev)
 {
 	struct	net_device *dev;
 	struct mlx4_ib_iboe *iboe = &ibdev->iboe;
+	int i;
 
-	if (reset_gid_table(ibdev))
-		return -1;
+	for (i = 1; i <= ibdev->num_ports; ++i)
+		if (reset_gid_table(ibdev, i))
+			return -1;
 
 	read_lock(&dev_base_lock);
 	spin_lock(&iboe->lock);