| The Gianfar Ethernet Driver | |
| Author: Andy Fleming <afleming@freescale.com> | |
| Updated: 2005-07-28 | |
| CHECKSUM OFFLOADING | |
| The eTSEC controller (first included in parts from late 2005 like | |
| the 8548) has the ability to perform TCP, UDP, and IP checksums | |
| in hardware. The Linux kernel only offloads the TCP and UDP | |
| checksums (and always performs the pseudo header checksums), so | |
| the driver only supports checksumming for TCP/IP and UDP/IP | |
| packets. Use ethtool to enable or disable this feature for RX | |
| and TX. | |
| VLAN | |
| In order to use VLAN, please consult Linux documentation on | |
| configuring VLANs. The gianfar driver supports hardware insertion and | |
| extraction of VLAN headers, but not filtering. Filtering will be | |
| done by the kernel. | |
| MULTICASTING | |
| The gianfar driver supports using the group hash table on the | |
| TSEC (and the extended hash table on the eTSEC) for multicast | |
| filtering. On the eTSEC, the exact-match MAC registers are used | |
| before the hash tables. See Linux documentation on how to join | |
| multicast groups. | |
| PADDING | |
| The gianfar driver supports padding received frames with 2 bytes | |
| to align the IP header to a 16-byte boundary, when supported by | |
| hardware. | |
| ETHTOOL | |
| The gianfar driver supports the use of ethtool for many | |
| configuration options. You must run ethtool only on currently | |
| open interfaces. See ethtool documentation for details. |