Re: [net-next v9 07/10] net: bnxt: Implement software USO

[Joe Damato]

On Tue, Apr 07, 2026 at 03:03:03PM -0700, Joe Damato wrote:

[...]

>  v9:
>    - Added inline slot check to prevent possible overwriting of in-flight
>      headers (suggested by AI).

[...]

>  netdev_tx_t bnxt_sw_udp_gso_xmit(struct bnxt *bp,
>  				 struct bnxt_tx_ring_info *txr,
>  				 struct netdev_queue *txq,
>  				 struct sk_buff *skb)
>  {

[...]

> +
> +	/* BD backpressure alone cannot prevent overwriting in-flight
> +	 * headers in the inline buffer. Check slot availability directly.
> +	 */
> +	slots = txr->tx_inline_prod - txr->tx_inline_cons;
> +	slots = BNXT_SW_USO_MAX_SEGS - slots;
> +
> +	if (unlikely(slots < num_segs)) {
> +		netif_txq_try_stop(txq, slots, num_segs);
> +		return NETDEV_TX_BUSY;

This is the check I added. AI says this is wrong and netdev_queues.h says:

  * @get_desc must be a formula or a function call, it must always
  * return up-to-date information when evaluated!

which I obviously failed to do, so I'm pretty sure I got this wrong.