From: Jacob Keller <jacob.e.kel...@intel.com>
Date: Thu, 10 Jul 2025 15:43:20 -0700
>
>
> On 7/7/2025 4:36 PM, Jacob Keller wrote:
[...]
> I got this to work with the following diff:
>
> diff --git i/drivers/net/ethernet/intel/ice/ice_txrx.h
> w/drivers/net/ethernet/intel/ice/ice_txrx.h
> index 42e74925b9df..6b72608a20ab 100644
> --- i/drivers/net/ethernet/intel/ice/ice_txrx.h
> +++ w/drivers/net/ethernet/intel/ice/ice_txrx.h
> @@ -342,7 +342,6 @@ struct ice_rx_ring {
> struct ice_tx_ring *xdp_ring;
> struct ice_rx_ring *next; /* pointer to next ring in
> q_vector */
> struct xsk_buff_pool *xsk_pool;
> - u32 nr_frags;
> u16 rx_buf_len;
> dma_addr_t dma; /* physical address of ring */
> u8 dcb_tc; /* Traffic class of ring */
> diff --git i/drivers/net/ethernet/intel/ice/ice_txrx.c
> w/drivers/net/ethernet/intel/ice/ice_txrx.c
> index 062291dac99c..403b5c54fd2a 100644
> --- i/drivers/net/ethernet/intel/ice/ice_txrx.c
> +++ w/drivers/net/ethernet/intel/ice/ice_txrx.c
> @@ -831,8 +831,7 @@ static int ice_clean_rx_irq(struct ice_rx_ring
> *rx_ring, int budget)
>
> /* retrieve a buffer from the ring */
> rx_buf = &rx_ring->rx_fqes[ntc];
> - if (!libeth_xdp_process_buff(xdp, rx_buf, size))
> - break;
> + libeth_xdp_process_buff(xdp, rx_buf, size);
>
> if (++ntc == cnt)
> ntc = 0;
> @@ -852,25 +851,18 @@ static int ice_clean_rx_irq(struct ice_rx_ring
> *rx_ring, int budget)
>
> xdp->data = NULL;
> rx_ring->first_desc = ntc;
> - rx_ring->nr_frags = 0;
> continue;
> construct_skb:
> skb = xdp_build_skb_from_buff(&xdp->base);
> + xdp->data = NULL;
> + rx_ring->first_desc = ntc;
>
> /* exit if we failed to retrieve a buffer */
> if (!skb) {
> - rx_ring->ring_stats->rx_stats.alloc_page_failed++;
> - xdp_verdict = ICE_XDP_CONSUMED;
> - xdp->data = NULL;
> - rx_ring->first_desc = ntc;
> - rx_ring->nr_frags = 0;
> + rx_ring->ring_stats->rx_stats.alloc_buf_failed++;
> break;
> }
>
> - xdp->data = NULL;
> - rx_ring->first_desc = ntc;
> - rx_ring->nr_frags = 0;
> -
> stat_err_bits = BIT(ICE_RX_FLEX_DESC_STATUS0_RXE_S);
> if (unlikely(ice_test_staterr(rx_desc->wb.status_error0,
> stat_err_bits))) {
More or less. I'm taking over this series since Michał's on a vacation,
I'll double check everything (against iavf and idpf as well).
Anyway, thanks for the fix.
>
>
> --->8---
>
> The essential change is to not break if libeth_xdp_process_buff returns
> false, since we still need to move the ring forward in this case, and
> the usual reason it returns false is the zero-length descriptor we
> sometimes get when using larger MTUs.
>
> I also dropped some of the updates and re-ordered how we assign
> xdp->data, and fixed the bug with the ring stats using alloc_page_failed
> instead of alloc_buf_failed like we should have. I think this could be
> further improved or cleaned up, but might be better to wait until the
> full usage of the XDP helpers.
>
> Regardless, we need something like this to fix the issues with larger MTU.
Thanks,
Olek
