On Wed, 04 Feb 2026 07:20:11 -0800 Daniel Zahka wrote:
> Implement the deferred tx key deletion api. In the case of mlx5,
> mlx5e_psp_tx_grace_begin() records the number of wqes retired on each
> tx queue, and then mlx5e_psp_tx_grace_end() returns 0 only if
> all tx queues have advanced a full ring cycle past the point where
> they were snapshotted.
Either Friday night enlightenment or I'm very tired -- but I wonder if
we can do with BQL, without touching the driver at all?
struct dql {
/* Fields accessed in enqueue path (dql_queued) */
unsigned int num_queued; /* Total ever queued */
...
/* Fields accessed only by completion path (dql_completed) */
unsigned int num_completed; /* Total ever completed */
...
};
These are free running counters of how many bytes were queued to
the driver and how many driver finished xmit'ing.
