netdev - Re: [PATCH 11/12 -Rev2] IPoIB xmit API addition

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Date:	Mon, 23 Jul 2007 14:48:26 +0400
From:	Evgeniy Polyakov <johnpol@....mipt.ru>
To:	Krishna Kumar <krkumar2@...ibm.com>
Cc:	davem@...emloft.net, rdreier@...co.com, Robert.Olsson@...a.slu.se,
	rick.jones2@...com, herbert@...dor.apana.org.au, gaagaan@...il.com,
	kumarkr@...ux.ibm.com, peter.p.waskiewicz.jr@...el.com,
	mcarlson@...adcom.com, jagana@...ibm.com,
	general@...ts.openfabrics.org, netdev@...r.kernel.org,
	tgraf@...g.ch, jeff@...zik.org, sri@...ibm.com, hadi@...erus.ca,
	kaber@...sh.net, mchan@...adcom.com, xma@...ibm.com
Subject: Re: [PATCH 11/12 -Rev2] IPoIB xmit API addition

On Sun, Jul 22, 2007 at 02:36:49PM +0530, Krishna Kumar (krkumar2@...ibm.com) wrote:
> diff -ruNp org/drivers/infiniband/ulp/ipoib/ipoib_ib.c rev2/drivers/infiniband/ulp/ipoib/ipoib_ib.c
> --- org/drivers/infiniband/ulp/ipoib/ipoib_ib.c	2007-07-20 07:49:28.000000000 +0530
> +++ rev2/drivers/infiniband/ulp/ipoib/ipoib_ib.c	2007-07-22 00:08:37.000000000 +0530
> @@ -242,8 +242,9 @@ repost:
>  static void ipoib_ib_handle_tx_wc(struct net_device *dev, struct ib_wc *wc)
>  {
>  	struct ipoib_dev_priv *priv = netdev_priv(dev);
> +	int i = 0, num_completions;
> +	int tx_ring_index = priv->tx_tail & (ipoib_sendq_size - 1);
>  	unsigned int wr_id = wc->wr_id;
> -	struct ipoib_tx_buf *tx_req;
>  	unsigned long flags;
>  
>  	ipoib_dbg_data(priv, "send completion: id %d, status: %d\n",
> @@ -255,23 +256,57 @@ static void ipoib_ib_handle_tx_wc(struct
>  		return;
>  	}
>  
> -	tx_req = &priv->tx_ring[wr_id];
> +	num_completions = wr_id - tx_ring_index + 1;
> +	if (num_completions <= 0)
> +		num_completions += ipoib_sendq_size;

Can this still be less than zero?

-- 
	Evgeniy Polyakov
-
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