Based on kernel version 3.13. Page generated on 2014-01-20 22:03 EST.
1 The Gianfar Ethernet Driver 2 Sysfs File description 3 4 Author: Andy Fleming <email@example.com> 5 Updated: 2005-07-28 6 7 SYSFS 8 9 Several of the features of the gianfar driver are controlled 10 through sysfs files. These are: 11 12 bd_stash: 13 To stash RX Buffer Descriptors in the L2, echo 'on' or '1' to 14 bd_stash, echo 'off' or '0' to disable 15 16 rx_stash_len: 17 To stash the first n bytes of the packet in L2, echo the number 18 of bytes to buf_stash_len. echo 0 to disable. 19 20 WARNING: You could really screw these up if you set them too low or high! 21 fifo_threshold: 22 To change the number of bytes the controller needs in the 23 fifo before it starts transmission, echo the number of bytes to 24 fifo_thresh. Range should be 0-511. 25 26 fifo_starve: 27 When the FIFO has less than this many bytes during a transmit, it 28 enters starve mode, and increases the priority of TX memory 29 transactions. To change, echo the number of bytes to 30 fifo_starve. Range should be 0-511. 31 32 fifo_starve_off: 33 Once in starve mode, the FIFO remains there until it has this 34 many bytes. To change, echo the number of bytes to 35 fifo_starve_off. Range should be 0-511. 36 37 CHECKSUM OFFLOADING 38 39 The eTSEC controller (first included in parts from late 2005 like 40 the 8548) has the ability to perform TCP, UDP, and IP checksums 41 in hardware. The Linux kernel only offloads the TCP and UDP 42 checksums (and always performs the pseudo header checksums), so 43 the driver only supports checksumming for TCP/IP and UDP/IP 44 packets. Use ethtool to enable or disable this feature for RX 45 and TX. 46 47 VLAN 48 49 In order to use VLAN, please consult Linux documentation on 50 configuring VLANs. The gianfar driver supports hardware insertion and 51 extraction of VLAN headers, but not filtering. Filtering will be 52 done by the kernel. 53 54 MULTICASTING 55 56 The gianfar driver supports using the group hash table on the 57 TSEC (and the extended hash table on the eTSEC) for multicast 58 filtering. On the eTSEC, the exact-match MAC registers are used 59 before the hash tables. See Linux documentation on how to join 60 multicast groups. 61 62 PADDING 63 64 The gianfar driver supports padding received frames with 2 bytes 65 to align the IP header to a 16-byte boundary, when supported by 66 hardware. 67 68 ETHTOOL 69 70 The gianfar driver supports the use of ethtool for many 71 configuration options. You must run ethtool only on currently 72 open interfaces. See ethtool documentation for details.