netdev - Re: [PATCH net-next 2/3] net: add gro

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Date:	Fri, 28 Sep 2012 01:27:37 +0200
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	David Miller <davem@...emloft.net>, netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next 2/3] net: add gro_cells infrastructure

On Thu, 2012-09-27 at 14:47 +0200, Eric Dumazet wrote:
> From: Eric Dumazet <edumazet@...gle.com>
> 
> This adds a new include file (include/net/gro_cells.h), to bring GRO
> (Generic Receive Offload) capability to tunnels, in a modular way.
> 
> Because tunnels receive path is lockless, and GRO adds a serialization
> using a napi_struct, I chose to add an array of up to 8 cells,
> so that multi queue devices wont be slowed down because of GRO layer.
> 
> skb_get_rx_queue() is used as selector.
> 
> In the future, we might add optional fanout capabilities, using rxhash
> for example.
> 
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> ---
>  include/net/gro_cells.h |  103 ++++++++++++++++++++++++++++++++++++++
>  net/core/dev.c          |    2 
>  2 files changed, 105 insertions(+)
> 
> diff --git a/include/net/gro_cells.h b/include/net/gro_cells.h
> new file mode 100644
> index 0000000..ba93b1b
> --- /dev/null
> +++ b/include/net/gro_cells.h
[...]
> +static inline int gro_cells_init(struct gro_cells *gcells, struct net_device *dev)
> +{
> +	int i;
> +
> +	gcells->gro_cells_mask = roundup_pow_of_two(min_t(unsigned int, 8, nr_cpu_ids)) - 1;
[...]

Perhaps this ought to use netif_get_num_default_rss_queues() instead of
open-coding something similar.

Ben.

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.

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