sfc: Distinguish queue lookup from test for queue existence
efx_channel_get_{rx,tx}_queue() currently return NULL if the channel
isn't used for traffic in that direction. In most cases this is a
bug, but some callers rely on it as an existence test.
Add existence test functions efx_channel_has_{rx_queue,tx_queues}()
and use them as appropriate.
Change efx_channel_get_{rx,tx}_queue() to assert that the requested
queue exists.
Remove now-redundant initialisation from efx_set_channels().
Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
3 files changed