[PATCH] sfxge improvements and bug fixes

[Andrew Rybchenko]

Hello,

my colleagues and me have a number of patches to sfxge driver including:
  - performance optimizations
  - fix TSO to work fine when VLAN is used (IPv6 does not work yet, to 
be fixed in the nearest time)
  - add tunable to control maximum number of RSS channels
  - improve software Tx queue to have separate limits for TCP and 
non-TCP traffic and more granular overflow statistics
  - cleanup

Patches are attached.

The goal of the submission is to get feedback and review notes 
(including mentor).

Best regards,
Andrew.
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