hssi: suggest hssi{loopback,stats} when eth interface is absent

[pcolberg]

While the D5005 FPGA card employs a separate kernel driver (s10hssi) to configure loopback and provide statistics via a network device, newer FPGA cards expose a UIO device used with hssiloopback and hssistats.

Closes: https://hsdes.intel.com/appstore/article/#/22019839240

Cc: @badanur

[coveralls]

Pull Request Test Coverage Report for Build 8653758794

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 64.673%

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Totals
Change from base Build 8653071263:	0.0%
Covered Lines:	15823
Relevant Lines:	24466

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💛 - Coveralls

[fpgamatt]

This change is helpful because it adds information to a weird error message, but can't we do better? Can't the hssi command figure out if the hssi in question is d5005 or a uio? That way no weird message would need to be printed out in the first place.

[pcolberg]

This change is helpful because it adds information to a weird error message, but can't we do better? Can't the hssi command figure out if the hssi in question is d5005 or a uio? That way no weird message would need to be printed out in the first place.

Thanks @fpgamatt, my thought as well; why was this functionality not integrated into the hssi command in the first place? That requires a bit more investigation; I have opened #3118.