[PATCH 13/13] net/ionic: optimize device start operation

[Stephen Hemminger]

On Fri, 2 Feb 2024 11:32:38 -0800
Andrew Boyer <andrew.boyer at amd.com> wrote:

> +	memset(ctx, 0, sizeof(*ctx));
> +	ctx->pending_work = true;
> +	ctx->cmd.q_init.opcode = IONIC_CMD_Q_INIT;
> +	ctx->cmd.q_init.type = q->type;
> +	ctx->cmd.q_init.ver = lif->qtype_info[q->type].version;
> +	ctx->cmd.q_init.index = rte_cpu_to_le_32(q->index);
> +	ctx->cmd.q_init.flags = rte_cpu_to_le_16(IONIC_QINIT_F_ENA);
> +	ctx->cmd.q_init.intr_index = rte_cpu_to_le_16(IONIC_INTR_NONE);
> +	ctx->cmd.q_init.ring_size = rte_log2_u32(q->num_descs);
> +	ctx->cmd.q_init.cq_ring_base = rte_cpu_to_le_64(cq->base_pa);
> +	ctx->cmd.q_init.sg_ring_base = rte_cpu_to_le_64(q->sg_base_pa);
> +

memset followed by assignment is technically slower than structure
initialization because it requires two writes to the data.
But the optimizer may in some cases figure that out.