netdev - Re: [PATCH net-next 3/6] [BNX2]: Remove the rx_offset field from the bnx2 structure.

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Date:	Fri, 16 May 2008 21:29:43 +0100
From:	Ben Hutchings <bhutchings@...arflare.com>
To:	Michael Chan <mchan@...adcom.com>
Cc:	davem@...emloft.net, netdev@...r.kernel.org, andy@...yhouse.net,
	benli@...adcom.com
Subject: Re: [PATCH net-next 3/6] [BNX2]: Remove the rx_offset field from the bnx2 structure.

Michael Chan wrote:
> [BNX2]: Remove the rx_offset field from the bnx2 structure.
> 
> The rx_offset field is set to a constant value and initialized
> only once.  By replacing all references to the rx_offset field,
> we can eliminate rx_offset from the bnx2 structure.  This will
> save 4 bytes for every bnx2 instance.

Probably not, since slab will round it up.

[...]
>  	bp->rx_buf_use_size = rx_size;
>  	/* hw alignment */
>  	bp->rx_buf_size = bp->rx_buf_use_size + BNX2_RX_ALIGN;
> -	bp->rx_jumbo_thresh = rx_size - bp->rx_offset;
> +	bp->rx_jumbo_thresh = rx_size - BNX2_RX_OFFSET;
>  	bp->rx_ring_size = size;
>  	bp->rx_max_ring = bnx2_find_max_ring(size, MAX_RX_RINGS);
>  	bp->rx_max_ring_idx = (bp->rx_max_ring * RX_DESC_CNT) - 1;
[...]
> +#define BNX2_RX_OFFSET		sizeof(struct l2_fhdr) + 2

The definition needs parentheses around it.  You would get away this
except for this one place where BNX2_RX_OFFSET is subtracted.

Ben.

-- 
Ben Hutchings, Senior Software Engineer, Solarflare Communications
Not speaking for my employer; that's the marketing department's job.
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