94 lines
3.7 KiB
Diff
94 lines
3.7 KiB
Diff
|
Path: news.gmane.org!not-for-mail
|
||
|
|
From: Anton Blanchard <anton@samba.org>
|
||
|
|
Newsgroups: gmane.linux.network
|
||
|
|
Subject: [PATCH 2/4] ibmveth: Fix issue with DMA mapping failure
|
||
|
|
Date: Thu, 08 Sep 2011 10:41:04 +1000
|
||
|
|
Lines: 47
|
||
|
|
Approved: news@gmane.org
|
||
|
|
Message-ID: <20110908004121.669225190@samba.org>
|
||
|
|
References: <20110908004102.355674129@samba.org>
|
||
|
|
NNTP-Posting-Host: lo.gmane.org
|
||
|
|
X-Trace: dough.gmane.org 1315442760 18037 80.91.229.12 (8 Sep 2011 00:46:00 GMT)
|
||
|
|
X-Complaints-To: usenet@dough.gmane.org
|
||
|
|
NNTP-Posting-Date: Thu, 8 Sep 2011 00:46:00 +0000 (UTC)
|
||
|
|
Cc: netdev@vger.kernel.org
|
||
|
|
To: Santiago Leon <santil@linux.vnet.ibm.com>,
|
||
|
|
brking@linux.vnet.ibm.com, rcj@linux.vnet.ibm.com
|
||
|
|
Original-X-From: netdev-owner@vger.kernel.org Thu Sep 08 02:45:55 2011
|
||
|
|
Return-path: <netdev-owner@vger.kernel.org>
|
||
|
|
Envelope-to: linux-netdev-2@lo.gmane.org
|
||
|
|
Original-Received: from vger.kernel.org ([209.132.180.67])
|
||
|
|
by lo.gmane.org with esmtp (Exim 4.69)
|
||
|
|
(envelope-from <netdev-owner@vger.kernel.org>)
|
||
|
|
id 1R1Ska-0001cA-M3
|
||
|
|
for linux-netdev-2@lo.gmane.org; Thu, 08 Sep 2011 02:45:53 +0200
|
||
|
|
Original-Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
|
||
|
|
id S1757665Ab1IHApa (ORCPT <rfc822;linux-netdev-2@m.gmane.org>);
|
||
|
|
Wed, 7 Sep 2011 20:45:30 -0400
|
||
|
|
Original-Received: from ozlabs.org ([203.10.76.45]:60840 "EHLO ozlabs.org"
|
||
|
|
rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
|
||
|
|
id S1757659Ab1IHAp1 (ORCPT <rfc822;netdev@vger.kernel.org>);
|
||
|
|
Wed, 7 Sep 2011 20:45:27 -0400
|
||
|
|
Original-Received: from localhost (ppp121-44-79-234.lns20.syd6.internode.on.net [121.44.79.234])
|
||
|
|
(using TLSv1 with cipher DHE-RSA-AES128-SHA (128/128 bits))
|
||
|
|
(Client did not present a certificate)
|
||
|
|
by ozlabs.org (Postfix) with ESMTPSA id 56E01B6F97;
|
||
|
|
Thu, 8 Sep 2011 10:45:25 +1000 (EST)
|
||
|
|
X-Mailbox-Line: From anton@samba.org Thu Sep 8 10:41:21 2011
|
||
|
|
User-Agent: quilt/0.48-1
|
||
|
|
Content-Disposition: inline; filename=ibmveth_dma_mapping_error.patch
|
||
|
|
Original-Sender: netdev-owner@vger.kernel.org
|
||
|
|
Precedence: bulk
|
||
|
|
List-ID: <netdev.vger.kernel.org>
|
||
|
|
X-Mailing-List: netdev@vger.kernel.org
|
||
|
|
Xref: news.gmane.org gmane.linux.network:205931
|
||
|
|
Archived-At: <http://permalink.gmane.org/gmane.linux.network/205931>
|
||
|
|
|
||
|
|
descs[].fields.address is 32bit which truncates any dma mapping
|
||
|
|
errors so dma_mapping_error() fails to catch it.
|
||
|
|
|
||
|
|
Use a dma_addr_t to do the comparison. With this patch I was able
|
||
|
|
to transfer many gigabytes of data with IOMMU fault injection set
|
||
|
|
at 10% probability.
|
||
|
|
|
||
|
|
Signed-off-by: Anton Blanchard <anton@samba.org>
|
||
|
|
Cc: <stable@kernel.org> # v2.6.37+
|
||
|
|
---
|
||
|
|
|
||
|
|
Index: linux-build/drivers/net/ibmveth.c
|
||
|
|
===================================================================
|
||
|
|
--- linux-build.orig/drivers/net/ibmveth.c 2011-09-01 15:01:18.066844039 +1000
|
||
|
|
+++ linux-build/drivers/net/ibmveth.c 2011-09-01 15:03:34.299079796 +1000
|
||
|
|
@@ -930,6 +930,7 @@ static netdev_tx_t ibmveth_start_xmit(st
|
||
|
|
union ibmveth_buf_desc descs[6];
|
||
|
|
int last, i;
|
||
|
|
int force_bounce = 0;
|
||
|
|
+ dma_addr_t dma_addr;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* veth handles a maximum of 6 segments including the header, so
|
||
|
|
@@ -994,17 +995,16 @@ retry_bounce:
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Map the header */
|
||
|
|
- descs[0].fields.address = dma_map_single(&adapter->vdev->dev, skb->data,
|
||
|
|
- skb_headlen(skb),
|
||
|
|
- DMA_TO_DEVICE);
|
||
|
|
- if (dma_mapping_error(&adapter->vdev->dev, descs[0].fields.address))
|
||
|
|
+ dma_addr = dma_map_single(&adapter->vdev->dev, skb->data,
|
||
|
|
+ skb_headlen(skb), DMA_TO_DEVICE);
|
||
|
|
+ if (dma_mapping_error(&adapter->vdev->dev, dma_addr))
|
||
|
|
goto map_failed;
|
||
|
|
|
||
|
|
descs[0].fields.flags_len = desc_flags | skb_headlen(skb);
|
||
|
|
+ descs[0].fields.address = dma_addr;
|
||
|
|
|
||
|
|
/* Map the frags */
|
||
|
|
for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
|
||
|
|
- unsigned long dma_addr;
|
||
|
|
skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
|
||
|
|
|
||
|
|
dma_addr = dma_map_page(&adapter->vdev->dev, frag->page,
|
||
|
|
|
||
|
|
|