sfc: handle limited FEC support
If the reported PHY capabilities do not include a given FEC mode, don't attempt to select that FEC mode anyway. If the user tries to set a mode through ethtool that is not supported, return an error. The _REQUESTED bits don't appear in the supported caps, but are implied by the corresponding FEC bits. Signed-off-by: Edward Cree <ecree@solarflare.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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