netdev - Re: [PATCH net-next v3 08/23] eth: bnxt: set page pool page order based on rx_page

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Message-ID: <CAHS8izOs_m9nzeqC5yXiW9c1etDug4NUoGowPzzPRbB4UFL_bQ@mail.gmail.com>
Date: Tue, 19 Aug 2025 12:43:43 -0700
From: Mina Almasry <almasrymina@...gle.com>
To: Pavel Begunkov <asml.silence@...il.com>
Cc: Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org, 
	Eric Dumazet <edumazet@...gle.com>, Willem de Bruijn <willemb@...gle.com>, 
	Paolo Abeni <pabeni@...hat.com>, andrew+netdev@...n.ch, horms@...nel.org, 
	davem@...emloft.net, sdf@...ichev.me, dw@...idwei.uk, 
	michael.chan@...adcom.com, dtatulea@...dia.com, ap420073@...il.com, 
	linux-kernel@...r.kernel.org, io-uring@...r.kernel.org
Subject: Re: [PATCH net-next v3 08/23] eth: bnxt: set page pool page order
 based on rx_page_size

On Mon, Aug 18, 2025 at 6:56 AM Pavel Begunkov <asml.silence@...il.com> wrote:
>
> From: Jakub Kicinski <kuba@...nel.org>
>
> If user decides to increase the buffer size for agg ring
> we need to ask the page pool for higher order pages.
> There is no need to use larger pages for header frags,
> if user increase the size of agg ring buffers switch
> to separate header page automatically.
>
> Signed-off-by: Jakub Kicinski <kuba@...nel.org>
> [pavel: calculate adjust max_len]
> Signed-off-by: Pavel Begunkov <asml.silence@...il.com>
> ---
>  drivers/net/ethernet/broadcom/bnxt/bnxt.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
> index 5307b33ea1c7..d3d9b72ef313 100644
> --- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
> +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
> @@ -3824,11 +3824,13 @@ static int bnxt_alloc_rx_page_pool(struct bnxt *bp,
>         pp.pool_size = bp->rx_agg_ring_size / agg_size_fac;
>         if (BNXT_RX_PAGE_MODE(bp))
>                 pp.pool_size += bp->rx_ring_size / rx_size_fac;
> +
> +       pp.order = get_order(bp->rx_page_size);
>         pp.nid = numa_node;
>         pp.netdev = bp->dev;
>         pp.dev = &bp->pdev->dev;
>         pp.dma_dir = bp->rx_dir;
> -       pp.max_len = PAGE_SIZE;
> +       pp.max_len = PAGE_SIZE << pp.order;

nit: I assume this could be `pp.max_len = bp->rx_ring_size;` if you
wanted, since bnxt is not actually using the full compound page in the
case that bp->rx_ring_size is not a power of 2. Though doesn't matter
much, either way:

Reviewed-by: Mina Almasry <almasrymina@...gle.com>

-- 
Thanks,
Mina