netdev - [PATCH 2/2] e1000: Fix DMA mapping error handling on RX

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Message-ID: <20100121114420.GA11892@kryten>
Date:	Thu, 21 Jan 2010 22:44:20 +1100
From:	Anton Blanchard <anton@...ba.org>
To:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Bruce Allan <bruce.w.allan@...el.com>,
	PJ Waskiewicz <peter.p.waskiewicz.jr@...el.com>,
	John Ronciak <john.ronciak@...el.com>,
	Don Skidmore <donald.c.skidmore@...el.com>,
	Yi Zou <yi.zou@...el.com>,
	Alexander Duyck <alexander.h.duyck@...el.com>
Cc:	e1000-devel@...ts.sourceforge.net, netdev@...r.kernel.org
Subject: [PATCH 2/2] e1000: Fix DMA mapping error handling on RX


Check for error return from pci_map_single/pci_map_page and clean up.

With this and the previous patch the driver was able to handle a significant
percentage of errors (I set the fault injection rate to 10% and could still
download large files at a reasonable speed).

Signed-off-by: Anton Blanchard <anton@...ba.org>
---

I wasn't able to stress the jumbo frame path, so that part could do with some
more eyes.

Index: linux.trees.git/drivers/net/e1000/e1000_main.c
===================================================================
--- linux.trees.git.orig/drivers/net/e1000/e1000_main.c	2010-01-21 11:13:10.000000000 +1100
+++ linux.trees.git/drivers/net/e1000/e1000_main.c	2010-01-21 11:15:54.000000000 +1100
@@ -4014,11 +4014,21 @@ check_page:
 			}
 		}
 
-		if (!buffer_info->dma)
+		if (!buffer_info->dma) {
 			buffer_info->dma = pci_map_page(pdev,
 			                                buffer_info->page, 0,
 			                                buffer_info->length,
 			                                PCI_DMA_FROMDEVICE);
+			if (pci_dma_mapping_error(pdev, buffer_info->dma)) {
+				put_page(buffer_info->page);
+				dev_kfree_skb(skb);
+				buffer_info->page = NULL;
+				buffer_info->skb = NULL;
+				buffer_info->dma = 0;
+				adapter->alloc_rx_buff_failed++;
+				break; /* while !buffer_info->skb */
+			}
+		}
 
 		rx_desc = E1000_RX_DESC(*rx_ring, i);
 		rx_desc->buffer_addr = cpu_to_le64(buffer_info->dma);
@@ -4109,6 +4119,13 @@ map_skb:
 						  skb->data,
 						  buffer_info->length,
 						  PCI_DMA_FROMDEVICE);
+		if (pci_dma_mapping_error(pdev, buffer_info->dma)) {
+			dev_kfree_skb(skb);
+			buffer_info->skb = NULL;
+			buffer_info->dma = 0;
+			adapter->alloc_rx_buff_failed++;
+			break; /* while !buffer_info->skb */
+		}
 
 		/*
 		 * XXX if it was allocated cleanly it will never map to a
--
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