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- 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.
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