On Wed, 14 Apr 2021 17:30:03 -0700 Tony Nguyen wrote:
> +static void ice_tx_dim_work(struct work_struct *work)
> +{
> +     struct ice_ring_container *rc;
> +     struct ice_q_vector *q_vector;
> +     struct dim *dim;
> +     u16 itr, intrl;
> +
> +     dim = container_of(work, struct dim, work);
> +     rc = container_of(dim, struct ice_ring_container, dim);
> +     q_vector = container_of(rc, struct ice_q_vector, tx);
> +
> +     if (dim->profile_ix >= ARRAY_SIZE(tx_profile))
> +             dim->profile_ix = ARRAY_SIZE(tx_profile) - 1;
> +
> +     /* look up the values in our local table */
> +     itr = tx_profile[dim->profile_ix].itr;
> +     intrl = tx_profile[dim->profile_ix].intrl;
> +
> +     ice_write_itr(rc, itr);
> +     ice_write_intrl(q_vector, intrl);
> +
> +     dim->state = DIM_START_MEASURE;

Are you only doing register writes in ice_write_itr/intrl or talk to FW?
Scheduler is expensive so you can save real cycles if you don't have to
rely on a work to do the programming (not sure how hard that is with
DIM, but since you're already sorta poking at the internals I thought
I'd ask).

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