| .. SPDX-License-Identifier: GPL-2.0 |
| |
| =========================== |
| The Gianfar Ethernet Driver |
| =========================== |
| |
| :Author: Andy Fleming <afleming@freescale.com> |
| :Updated: 2005-07-28 |
| |
| |
| Checksum Offloading |
| =================== |
| |
| 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. |
| |
| VLAN |
| ==== |
| |
| 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. |
| |
| Multicasting |
| ============ |
| |
| 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. |
| |
| Padding |
| ======= |
| |
| The gianfar driver supports padding received frames with 2 bytes |
| to align the IP header to a 16-byte boundary, when supported by |
| hardware. |
| |
| Ethtool |
| ======= |
| |
| 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. |
