netdev - Re: [PATCH 3/3] chelsio: more receive cleanup

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Date:	Fri, 15 Dec 2006 21:10:19 +0100
From:	Francois Romieu <romieu@...zoreil.com>
To:	Stephen Hemminger <shemminger@...l.org>
Cc:	Jeff Garzik <jgarzik@...ox.com>, netdev@...r.kernel.org
Subject: Re: [PATCH 3/3] chelsio: more receive cleanup

Stephen Hemminger <shemminger@...l.org> :
[...]
> --- linux-2.6.20-rc1.orig/drivers/net/chelsio/sge.c
> +++ linux-2.6.20-rc1/drivers/net/chelsio/sge.c
[...]
> @@ -1059,37 +1062,33 @@ static void recycle_fl_buf(struct freelQ
>   *	threshold and the packet is too big to copy, or (b) the packet should
>   *	be copied but there is no memory for the copy.
>   */
> -static inline struct sk_buff *get_packet(struct pci_dev *pdev,
> -					 struct freelQ *fl, unsigned int len,
> -					 int dma_pad, int skb_pad,
> -					 unsigned int copy_thres,
> -					 unsigned int drop_thres)
> +static inline struct sk_buff *get_packet(struct pci_dev *pdev, struct freelQ *fl,
> +					 unsigned int len)
>  {
>  	struct sk_buff *skb;
> -	struct freelQ_ce *ce = &fl->centries[fl->cidx];
> +	const struct freelQ_ce *ce = &fl->centries[fl->cidx];
> +
> +	if (len < copybreak) {

If you are into cleanups, maybe add likely/unlikely (and remove the inline) ?

> +		skb = alloc_skb(len + 2, GFP_ATOMIC);
> +		if (!skb)
> +			goto use_orig_buf;
>  
> -	if (len < copy_thres) {
> -		skb = alloc_skb(len + skb_pad, GFP_ATOMIC);
> -		if (likely(skb != NULL)) {
> -			skb_reserve(skb, skb_pad);
> -			skb_put(skb, len);
> -			pci_dma_sync_single_for_cpu(pdev,
> +		skb_reserve(skb, 2);	/* align IP header */

s/2/NET_IP_ALIGN/

Btw, since the driver supports netpoll, its blind enabling of interrupts
in t1_poll() seems old-fashoined (see thread starting at
http://lkml.org/lkml/2006/12/12/86)

-- 
Ueimor
-
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