linux-kernel - Re: r8169 MTU greater than 1500 causes corruption for other controllers

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Message-ID: <20080820214350.GA18747@electric-eye.fr.zoreil.com>
Date:	Wed, 20 Aug 2008 23:43:50 +0200
From:	Francois Romieu <romieu@...zoreil.com>
To:	Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>
Cc:	Timothy J Fontaine <tjfontaine@...consulting.com>,
	Netdev <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: r8169 MTU greater than 1500 causes corruption for other
	controllers

Ilpo Järvinen <ilpo.jarvinen@...sinki.fi> :
[...]
> Hmm, there was no explanation why the tp->rx_buf_sz to pkt_size change
> was made in that commit (I have no idea whether those sizes have to match 
> to other places that use tp->rx_buf_sz)...

Because there is no need to sync data that has not been used ?

Timothy, could you check if the patch below does the job too ? It should
fix at least one pci_map / pci_unmap unbalance.

@@ -2789,10 +2789,10 @@ static int rtl8169_rx_interrupt(struct net_device *dev,
 
 			if (rtl8169_try_rx_copy(&skb, tp, pkt_size, addr)) {
 				pci_dma_sync_single_for_device(pdev, addr,
 					pkt_size, PCI_DMA_FROMDEVICE);
 				rtl8169_mark_to_asic(desc, tp->rx_buf_sz);
 			} else {
-				pci_unmap_single(pdev, addr, pkt_size,
+				pci_unmap_single(pdev, addr, tp->rx_buf_sz,
 						 PCI_DMA_FROMDEVICE);
 				tp->Rx_skbuff[entry] = NULL;
 			}

-- 
Ueimor
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