Netif msg leve

Netif msg leve

NETIF MSG level 使用ioctl修改等级。

各等级描述如下：       

• 0 Minimal messages, only essential information on fatal errors.
• 1 Standard messages, initialization status. No run-time messages
• 2 Special media selection messages, generally timer-driver.
• 3 Interface starts and stops, including normal status messages
• 4 Tx and Rx frame error messages, and abnormal driver operation
• 5 Tx packet queue information, interrupt events.
• 6 Status on each completed Tx packet and received Rx packets
• 7 Initial contents of Tx and Rx packets

The set of message levels is named

Old level	Name	Bit position
0	NETIF_MSG_DRV	0x0001
1	NETIF_MSG_PROBE	0x0002
2	NETIF_MSG_LINK	0x0004
2	NETIF_MSG_TIMER	0x0004
3	NETIF_MSG_IFDOWN	0x0008
3	NETIF_MSG_IFUP	0x0008
4	NETIF_MSG_RX_ERR	0x0010
4	NETIF_MSG_TX_ERR	0x0010
5	NETIF_MSG_TX_QUEUED	0x0020
5	NETIF_MSG_INTR	0x0020
6	NETIF_MSG_TX_DONE	0x0040
6	NETIF_MSG_RX_STATUS	0x0040
7	NETIF_MSG_PKTDATA	0x0080