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