sfc: use tx_queue->old_read_count in EF100 TX path
As in the Siena/EF10 case, it minimises cacheline ping-pong between the TX and completion paths. Signed-off-by: NEdward Cree <ecree@solarflare.com> Signed-off-by: NJakub Kicinski <kuba@kernel.org>
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