Patchwork [net,1/1] r8169: fix vlan tag read ordering.

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Submitter fran├žois romieu
Date Jan. 24, 2013, 11:30 p.m.
Message ID <20130124233006.GA7511@electric-eye.fr.zoreil.com>
Download mbox | patch
Permalink /patch/215510/
State Accepted
Delegated to: David Miller
Headers show

Comments

fran├žois romieu - Jan. 24, 2013, 11:30 p.m.
Control of receive descriptor must not be returned to ethernet chipset
before vlan tag processing is done.

VLAN tag receive word is now reset both in normal and error path.

Signed-off-by: Francois Romieu <romieu@fr.zoreil.com>
Spotted-by: Timo Teras <timo.teras@iki.fi>
Cc: Hayes Wang <hayeswang@realtek.com>
---
 drivers/net/ethernet/realtek/r8169.c | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)
David Miller - Jan. 28, 2013, 12:29 a.m.
From: Francois Romieu <romieu@fr.zoreil.com>
Date: Fri, 25 Jan 2013 00:30:06 +0100

> Control of receive descriptor must not be returned to ethernet chipset
> before vlan tag processing is done.
> 
> VLAN tag receive word is now reset both in normal and error path.
> 
> Signed-off-by: Francois Romieu <romieu@fr.zoreil.com>
> Spotted-by: Timo Teras <timo.teras@iki.fi>
> Cc: Hayes Wang <hayeswang@realtek.com>

Applied.
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Patch

diff --git a/drivers/net/ethernet/realtek/r8169.c b/drivers/net/ethernet/realtek/r8169.c
index c28bc31..1170232 100644
--- a/drivers/net/ethernet/realtek/r8169.c
+++ b/drivers/net/ethernet/realtek/r8169.c
@@ -1826,8 +1826,6 @@  static void rtl8169_rx_vlan_tag(struct RxDesc *desc, struct sk_buff *skb)
 
 	if (opts2 & RxVlanTag)
 		__vlan_hwaccel_put_tag(skb, swab16(opts2 & 0xffff));
-
-	desc->opts2 = 0;
 }
 
 static int rtl8169_gset_tbi(struct net_device *dev, struct ethtool_cmd *cmd)
@@ -6064,8 +6062,6 @@  static int rtl_rx(struct net_device *dev, struct rtl8169_private *tp, u32 budget
 			    !(status & (RxRWT | RxFOVF)) &&
 			    (dev->features & NETIF_F_RXALL))
 				goto process_pkt;
-
-			rtl8169_mark_to_asic(desc, rx_buf_sz);
 		} else {
 			struct sk_buff *skb;
 			dma_addr_t addr;
@@ -6086,16 +6082,14 @@  process_pkt:
 			if (unlikely(rtl8169_fragmented_frame(status))) {
 				dev->stats.rx_dropped++;
 				dev->stats.rx_length_errors++;
-				rtl8169_mark_to_asic(desc, rx_buf_sz);
-				continue;
+				goto release_descriptor;
 			}
 
 			skb = rtl8169_try_rx_copy(tp->Rx_databuff[entry],
 						  tp, pkt_size, addr);
-			rtl8169_mark_to_asic(desc, rx_buf_sz);
 			if (!skb) {
 				dev->stats.rx_dropped++;
-				continue;
+				goto release_descriptor;
 			}
 
 			rtl8169_rx_csum(skb, status);
@@ -6111,6 +6105,10 @@  process_pkt:
 			tp->rx_stats.bytes += pkt_size;
 			u64_stats_update_end(&tp->rx_stats.syncp);
 		}
+release_descriptor:
+		desc->opts2 = 0;
+		wmb();
+		rtl8169_mark_to_asic(desc, rx_buf_sz);
 	}
 
 	count = cur_rx - tp->cur_rx;