netdev - Re: [PATCH net-next] net: marvell: return csum computation result from mvneta_rx_csum/mvpp2_rx

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Date:   Tue, 22 Jun 2021 10:22:27 +0200
From:   Lorenzo Bianconi <lorenzo.bianconi@...hat.com>
To:     netdev@...r.kernel.org
Cc:     mcroce@...ux.microsoft.com, davem@...emloft.net, kuba@...nel.org,
        sgoutham@...vell.com, sbhatta@...vell.com, stefanc@...vell.com,
        brouer@...hat.com, thomas.petazzoni@...tlin.com,
        linux@...linux.org.uk, mw@...ihalf.com
Subject: Re: [PATCH net-next] net: marvell: return csum computation result
 from mvneta_rx_csum/mvpp2_rx_csum

> This is a preliminary patch to add hw csum hint support to
> mvneta/mvpp2 xdp implementation
> 
> Tested-by: Matteo Croce <mcroce@...ux.microsoft.com>
> Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>

Hi Dave and Jakub,

I have just noticed this patch is marked as "Not Applicable" in patchwork. I
tried to rebase it on top of net-next and it applies and compiles so I am
wondering why it is "not applicable". Am I missing something?

Regards,
Lorenzo

> ---
>  drivers/net/ethernet/marvell/mvneta.c         | 19 +++++++------------
>  .../net/ethernet/marvell/mvpp2/mvpp2_main.c   | 14 +++++---------
>  2 files changed, 12 insertions(+), 21 deletions(-)
> 
> diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c
> index c15ce06427d0..88a755034c39 100644
> --- a/drivers/net/ethernet/marvell/mvneta.c
> +++ b/drivers/net/ethernet/marvell/mvneta.c
> @@ -1805,18 +1805,14 @@ static void mvneta_rx_error(struct mvneta_port *pp,
>  }
>  
>  /* Handle RX checksum offload based on the descriptor's status */
> -static void mvneta_rx_csum(struct mvneta_port *pp, u32 status,
> -			   struct sk_buff *skb)
> +static int mvneta_rx_csum(struct mvneta_port *pp, u32 status)
>  {
>  	if ((pp->dev->features & NETIF_F_RXCSUM) &&
>  	    (status & MVNETA_RXD_L3_IP4) &&
> -	    (status & MVNETA_RXD_L4_CSUM_OK)) {
> -		skb->csum = 0;
> -		skb->ip_summed = CHECKSUM_UNNECESSARY;
> -		return;
> -	}
> +	    (status & MVNETA_RXD_L4_CSUM_OK))
> +		return CHECKSUM_UNNECESSARY;
>  
> -	skb->ip_summed = CHECKSUM_NONE;
> +	return CHECKSUM_NONE;
>  }
>  
>  /* Return tx queue pointer (find last set bit) according to <cause> returned
> @@ -2335,7 +2331,7 @@ mvneta_swbm_build_skb(struct mvneta_port *pp, struct page_pool *pool,
>  
>  	skb_reserve(skb, xdp->data - xdp->data_hard_start);
>  	skb_put(skb, xdp->data_end - xdp->data);
> -	mvneta_rx_csum(pp, desc_status, skb);
> +	skb->ip_summed = mvneta_rx_csum(pp, desc_status);
>  
>  	for (i = 0; i < num_frags; i++) {
>  		skb_frag_t *frag = &sinfo->frags[i];
> @@ -2535,7 +2531,7 @@ static int mvneta_rx_hwbm(struct napi_struct *napi,
>  				     rx_bytes);
>  
>  			skb->protocol = eth_type_trans(skb, dev);
> -			mvneta_rx_csum(pp, rx_status, skb);
> +			skb->ip_summed = mvneta_rx_csum(pp, rx_status);
>  			napi_gro_receive(napi, skb);
>  
>  			rcvd_pkts++;
> @@ -2584,8 +2580,7 @@ static int mvneta_rx_hwbm(struct napi_struct *napi,
>  		skb_put(skb, rx_bytes);
>  
>  		skb->protocol = eth_type_trans(skb, dev);
> -
> -		mvneta_rx_csum(pp, rx_status, skb);
> +		skb->ip_summed = mvneta_rx_csum(pp, rx_status);
>  
>  		napi_gro_receive(napi, skb);
>  	}
> diff --git a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
> index 9bca8c8f9f8d..01f6078bc859 100644
> --- a/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
> +++ b/drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c
> @@ -3543,21 +3543,17 @@ static void mvpp2_rx_error(struct mvpp2_port *port,
>  }
>  
>  /* Handle RX checksum offload */
> -static void mvpp2_rx_csum(struct mvpp2_port *port, u32 status,
> -			  struct sk_buff *skb)
> +static int mvpp2_rx_csum(struct mvpp2_port *port, u32 status)
>  {
>  	if (((status & MVPP2_RXD_L3_IP4) &&
>  	     !(status & MVPP2_RXD_IP4_HEADER_ERR)) ||
>  	    (status & MVPP2_RXD_L3_IP6))
>  		if (((status & MVPP2_RXD_L4_UDP) ||
>  		     (status & MVPP2_RXD_L4_TCP)) &&
> -		     (status & MVPP2_RXD_L4_CSUM_OK)) {
> -			skb->csum = 0;
> -			skb->ip_summed = CHECKSUM_UNNECESSARY;
> -			return;
> -		}
> +		     (status & MVPP2_RXD_L4_CSUM_OK))
> +			return CHECKSUM_UNNECESSARY;
>  
> -	skb->ip_summed = CHECKSUM_NONE;
> +	return CHECKSUM_NONE;
>  }
>  
>  /* Allocate a new skb and add it to BM pool */
> @@ -4012,7 +4008,7 @@ static int mvpp2_rx(struct mvpp2_port *port, struct napi_struct *napi,
>  
>  		skb_reserve(skb, MVPP2_MH_SIZE + MVPP2_SKB_HEADROOM);
>  		skb_put(skb, rx_bytes);
> -		mvpp2_rx_csum(port, rx_status, skb);
> +		skb->ip_summed = mvpp2_rx_csum(port, rx_status);
>  		skb->protocol = eth_type_trans(skb, dev);
>  
>  		napi_gro_receive(napi, skb);
> -- 
> 2.31.1
> 

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