net/mlx4: adjust initial value of vl_cap in mlx4_SET_PORT

Adjust the initial value of vl_cap in mlx4_SET_PORT such that
only for CX3 devices we start with 8 VLs, in an attempt to
avoid errors such as:

 mlx4_core 0000:06:00.0: command 0xc failed: fw status = 0x40
 mlx4_core 0000:06:00.0: vhcr command:0xc slave:0 failed with error:0, status -12

to appear in the system log.

Signed-off-by: Or Gerlitz <[email protected]>
Signed-off-by: Aviad Yehezkel <[email protected]>
Signed-off-by: Jack Morgenstein <[email protected]>
Signed-off-by: Vladimir Sokolovsky <[email protected]>
(Ported from Mellanox OFED 2.4)

Signed-off-by: Mukesh Kacker <[email protected]>

Author: ogerlitz

drivers/net/ethernet/mellanox/mlx4/port.c

@@ -930,6 +930,15 @@ enum {
 	MLX4_CHANGE_PORT_MTU_CAP = 22,
 };
 
+#define	CX3_PPF_DEV_ID 0x1003
+static int vl_cap_start(struct mlx4_dev *dev)
+{
+	/* for non CX3 devices, start with 4 VLs to avoid errors in syslog */
+	if (dev->persist->pdev->device != CX3_PPF_DEV_ID)
+		return 4;
+	return 8;
+}
+
 int mlx4_SET_PORT(struct mlx4_dev *dev, u8 port, int pkey_tbl_sz)
 {
 	struct mlx4_cmd_mailbox *mailbox;
@@ -950,7 +959,7 @@ int mlx4_SET_PORT(struct mlx4_dev *dev, u8 port, int pkey_tbl_sz)
 	}
 
 	/* IB VL CAP enum isn't used by the firmware, just numerical values */
-	for (vl_cap = 8; vl_cap >= 1; vl_cap >>= 1) {
+	for (vl_cap = vl_cap_start(dev); vl_cap >= 1; vl_cap >>= 1) {
 		((__be32 *) mailbox->buf)[0] = cpu_to_be32(
 			(1 << MLX4_CHANGE_PORT_MTU_CAP) |
 			(1 << MLX4_CHANGE_PORT_VL_CAP)  |