[FS#559] No Ethernet statistics on ag71xx

[LEDE Bugs]

A new Flyspray task has been opened.  Details are below. 

User who did this - Juliusz Chroboczek (jch) 

Attached to Project - LEDE Project
Summary - No Ethernet statistics on ag71xx
Task Type - Feature Request
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Low
Priority - Very Low
Reported Version - lede-17.01
Due in Version - Undecided
Due Date - Undecided
Details - On WNDR3700v2:

 
    # ethtool -i eth1 | head -n 2
    driver: ag71xx
    version: 0.5.35
    # ethtool -S eth1
    no stats available

The only statistics available are the ones provided by `ifconfig`, but I'm not sure whether that is accurate — I'm not seeing any drops even under load. 

Note that statistics are available on the switch (through `swconfig show`), it's only the SoC's interface that's impacted.

(While I'm at it, the driver is incomplete in other ways — there's no support for Pause frames or for scatter-gather, although a quick read of the datasheet indicates that it should be possible to implement these features.  I'm not sure that's important, though.)

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=559