1*132db935SJakub Kicinski.. SPDX-License-Identifier: GPL-2.0 2*132db935SJakub Kicinski 3*132db935SJakub Kicinski=========================== 4*132db935SJakub KicinskiThe Gianfar Ethernet Driver 5*132db935SJakub Kicinski=========================== 6*132db935SJakub Kicinski 7*132db935SJakub Kicinski:Author: Andy Fleming <afleming@freescale.com> 8*132db935SJakub Kicinski:Updated: 2005-07-28 9*132db935SJakub Kicinski 10*132db935SJakub Kicinski 11*132db935SJakub KicinskiChecksum Offloading 12*132db935SJakub Kicinski=================== 13*132db935SJakub Kicinski 14*132db935SJakub KicinskiThe eTSEC controller (first included in parts from late 2005 like 15*132db935SJakub Kicinskithe 8548) has the ability to perform TCP, UDP, and IP checksums 16*132db935SJakub Kicinskiin hardware. The Linux kernel only offloads the TCP and UDP 17*132db935SJakub Kicinskichecksums (and always performs the pseudo header checksums), so 18*132db935SJakub Kicinskithe driver only supports checksumming for TCP/IP and UDP/IP 19*132db935SJakub Kicinskipackets. Use ethtool to enable or disable this feature for RX 20*132db935SJakub Kicinskiand TX. 21*132db935SJakub Kicinski 22*132db935SJakub KicinskiVLAN 23*132db935SJakub Kicinski==== 24*132db935SJakub Kicinski 25*132db935SJakub KicinskiIn order to use VLAN, please consult Linux documentation on 26*132db935SJakub Kicinskiconfiguring VLANs. The gianfar driver supports hardware insertion and 27*132db935SJakub Kicinskiextraction of VLAN headers, but not filtering. Filtering will be 28*132db935SJakub Kicinskidone by the kernel. 29*132db935SJakub Kicinski 30*132db935SJakub KicinskiMulticasting 31*132db935SJakub Kicinski============ 32*132db935SJakub Kicinski 33*132db935SJakub KicinskiThe gianfar driver supports using the group hash table on the 34*132db935SJakub KicinskiTSEC (and the extended hash table on the eTSEC) for multicast 35*132db935SJakub Kicinskifiltering. On the eTSEC, the exact-match MAC registers are used 36*132db935SJakub Kicinskibefore the hash tables. See Linux documentation on how to join 37*132db935SJakub Kicinskimulticast groups. 38*132db935SJakub Kicinski 39*132db935SJakub KicinskiPadding 40*132db935SJakub Kicinski======= 41*132db935SJakub Kicinski 42*132db935SJakub KicinskiThe gianfar driver supports padding received frames with 2 bytes 43*132db935SJakub Kicinskito align the IP header to a 16-byte boundary, when supported by 44*132db935SJakub Kicinskihardware. 45*132db935SJakub Kicinski 46*132db935SJakub KicinskiEthtool 47*132db935SJakub Kicinski======= 48*132db935SJakub Kicinski 49*132db935SJakub KicinskiThe gianfar driver supports the use of ethtool for many 50*132db935SJakub Kicinskiconfiguration options. You must run ethtool only on currently 51*132db935SJakub Kicinskiopen interfaces. See ethtool documentation for details. 52