linux-kernel - Re: [PATCH net-next] octeontx2-pf: Add support for page pool

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Date:   Tue, 16 May 2023 11:01:12 +0200
From:   Paolo Abeni <pabeni@...hat.com>
To:     Ratheesh Kannoth <rkannoth@...vell.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     sgoutham@...vell.com, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org
Subject: Re: [PATCH net-next] octeontx2-pf: Add support for page pool

On Mon, 2023-05-15 at 11:26 +0530, Ratheesh Kannoth wrote:
> diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_txrx.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_txrx.c
> index 7045fedfd73a..df5f45aa6980 100644
> --- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_txrx.c
> +++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_txrx.c
> @@ -217,9 +217,10 @@ static bool otx2_skb_add_frag(struct otx2_nic *pfvf, struct sk_buff *skb,
>  		skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page,
>  				va - page_address(page) + off,
>  				len - off, pfvf->rbsize);
> -
> +#ifndef CONFIG_PAGE_POOL
>  		otx2_dma_unmap_page(pfvf, iova - OTX2_HEAD_ROOM,
>  				    pfvf->rbsize, DMA_FROM_DEVICE);
> +#endif

Don't you need to do the same even when CONFIG_PAGE_POOL and !pool-
>page_pool ?

>  		return true;
>  	}
>  
> @@ -382,6 +383,8 @@ static void otx2_rcv_pkt_handler(struct otx2_nic *pfvf,
>  	if (pfvf->netdev->features & NETIF_F_RXCSUM)
>  		skb->ip_summed = CHECKSUM_UNNECESSARY;
>  
> +	skb_mark_for_recycle(skb);

Don't you need to set the recycle only when pool->page_pool?

Overall it looks like that having both the pool->page_pool and
CONFIG_PAGE_POOL checks in place add a few possible sources of bugs.

Cheers,

Paolo