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-The Gianfar Ethernet Driver
-Sysfs File description
-Author: Andy Fleming <>
-Updated: 2005-07-28
-Several of the features of the gianfar driver are controlled
-through sysfs files. These are:
-To stash RX Buffer Descriptors in the L2, echo 'on' or '1' to
-bd_stash, echo 'off' or '0' to disable
-To stash the first n bytes of the packet in L2, echo the number
-of bytes to buf_stash_len. echo 0 to disable.
-WARNING: You could really screw these up if you set them too low or high!
-To change the number of bytes the controller needs in the
-fifo before it starts transmission, echo the number of bytes to
-fifo_thresh. Range should be 0-511.
-When the FIFO has less than this many bytes during a transmit, it
-enters starve mode, and increases the priority of TX memory
-transactions. To change, echo the number of bytes to
-fifo_starve. Range should be 0-511.
-Once in starve mode, the FIFO remains there until it has this
-many bytes. To change, echo the number of bytes to
-fifo_starve_off. Range should be 0-511.
-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.
-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.
-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.
-The gianfar driver supports padding received frames with 2 bytes
-to align the IP header to a 16-byte boundary, when supported by
-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.