1.. SPDX-License-Identifier: GPL-2.0 2 3=========================== 4The Gianfar Ethernet Driver 5=========================== 6 7:Author: Andy Fleming <afleming@freescale.com> 8:Updated: 2005-07-28 9 10 11Checksum Offloading 12=================== 13 14The eTSEC controller (first included in parts from late 2005 like 15the 8548) has the ability to perform TCP, UDP, and IP checksums 16in hardware. The Linux kernel only offloads the TCP and UDP 17checksums (and always performs the pseudo header checksums), so 18the driver only supports checksumming for TCP/IP and UDP/IP 19packets. Use ethtool to enable or disable this feature for RX 20and TX. 21 22VLAN 23==== 24 25In order to use VLAN, please consult Linux documentation on 26configuring VLANs. The gianfar driver supports hardware insertion and 27extraction of VLAN headers, but not filtering. Filtering will be 28done by the kernel. 29 30Multicasting 31============ 32 33The gianfar driver supports using the group hash table on the 34TSEC (and the extended hash table on the eTSEC) for multicast 35filtering. On the eTSEC, the exact-match MAC registers are used 36before the hash tables. See Linux documentation on how to join 37multicast groups. 38 39Padding 40======= 41 42The gianfar driver supports padding received frames with 2 bytes 43to align the IP header to a 16-byte boundary, when supported by 44hardware. 45 46Ethtool 47======= 48 49The gianfar driver supports the use of ethtool for many 50configuration options. You must run ethtool only on currently 51open interfaces. See ethtool documentation for details. 52