netdev - Re: [PATCH intel-next v4 4/8] i40e: Change size to truesize when using i40e_rx_buffer

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Date:   Wed, 15 Feb 2023 15:11:32 -0800
From:   Tony Nguyen <anthony.l.nguyen@...el.com>
To:     Tirthendu Sarkar <tirthendu.sarkar@...el.com>,
        <intel-wired-lan@...ts.osuosl.org>
CC:     <jesse.brandeburg@...el.com>, <netdev@...r.kernel.org>,
        <bpf@...r.kernel.org>, <magnus.karlsson@...el.com>,
        <maciej.fijalkowski@...el.com>
Subject: Re: [PATCH intel-next v4 4/8] i40e: Change size to truesize when
 using i40e_rx_buffer_flip()

On 2/15/2023 4:43 AM, Tirthendu Sarkar wrote:
> Truesize is now passed directly to i40e_rx_buffer_flip() instead of size
> so that it does not need to recalculate truesize from size using
> i40e_rx_frame_truesize() before adjusting page offset.
> 
> With these change the function can now be used during skb building and
> adding frags. In later patches it will also be easier for adjusting
> page offsets for multi-buffers.
> 
> Signed-off-by: Tirthendu Sarkar <tirthendu.sarkar@...el.com>
> ---
>   drivers/net/ethernet/intel/i40e/i40e_txrx.c | 54 ++++++++-------------
>   1 file changed, 19 insertions(+), 35 deletions(-)
> 
> diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
> index a7fba294a8f4..019abd7273a2 100644
> --- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c
> +++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
> @@ -2018,6 +2018,21 @@ static bool i40e_can_reuse_rx_page(struct i40e_rx_buffer *rx_buffer,
>   	return true;
>   }
>   
> +/**
> + * i40e_rx_buffer_flip - adjusted rx_buffer to point to an unused region
> + * @rx_buffer: Rx buffer to adjust
> + * @size: Size of adjustment

s/size/truesize

> + **/
> +static void i40e_rx_buffer_flip(struct i40e_rx_buffer *rx_buffer,
> +				unsigned int truesize)
> +{
> +#if (PAGE_SIZE < 8192)
> +	rx_buffer->page_offset ^= truesize;
> +#else
> +	rx_buffer->page_offset += truesize;
> +#endif
> +}
> +
>   /**
>    * i40e_add_rx_frag - Add contents of Rx buffer to sk_buff
>    * @rx_ring: rx descriptor ring to transact packets on