Re: [PATCH v2 net-next] net: core: use listified Rx for GRO_NORMAL in napi_gro_receive()

Edward Cree
2019-11-25T13:22:07Z

On 25/11/2019 12:02, Alexander Lobakin wrote:
> I'm not very familiar with iwlwifi, but as a work around manual
> napi_gro_flush() you can also manually flush napi->rx_list to
> prevent packets from stalling:
>
> diff -Naur a/drivers/net/wireless/intel/iwlwifi/pcie/rx.c b/drivers/net/wireless/intel/iwlwifi/pcie/rx.c
> --- a/drivers/net/wireless/intel/iwlwifi/pcie/rx.c    2019-11-25 14:55:03.610355230 +0300
> +++ b/drivers/net/wireless/intel/iwlwifi/pcie/rx.c    2019-11-25 14:57:29.399556868 +0300
> @@ -1526,8 +1526,16 @@
>      if (unlikely(emergency && count))
>          iwl_pcie_rxq_alloc_rbs(trans, GFP_ATOMIC, rxq);
>
> -    if (rxq->napi.poll)
> +    if (rxq->napi.poll) {
> +        if (rxq->napi.rx_count) {
> +            netif_receive_skb_list(&rxq->napi.rx_list);
> +
> +            INIT_LIST_HEAD(&rxq->napi.rx_list);
> +            rxq->napi.rx_count = 0;
> +        }
> +
>          napi_gro_flush(&rxq->napi, false);
> +    }
>
>      iwl_pcie_rxq_restock(trans, rxq);
>  }
... or we could export gro_normal_list(), instead of open-coding it
in the driver?

-Ed