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1 | The Gianfar Ethernet Driver |
2 | Sysfs File description |
3 | |
4 | Author: Andy Fleming <afleming@freescale.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. |
73 |
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