This is a note to let you know that I've just added the patch titled
net: sh_eth: fix incorrect RX length error if R8A7740
to the 3.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
net-sh_eth-fix-incorrect-rx-length-error-if-r8a7740.patch
and it can be found in the queue-3.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 6f4f1077b6801410a3af4d3523a82823bdfdfc18 Mon Sep 17 00:00:00 2001
From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
Date: Thu, 13 Jun 2013 10:15:45 +0900
Subject: net: sh_eth: fix incorrect RX length error if R8A7740
From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
[ Upstream commit dd019897358b815f7828dab90b51d51df4d3658d ]
This patch fixes an issue that the driver increments the "RX length error"
on every buffer in sh_eth_rx() if the R8A7740.
This patch also adds a description about the Receive Frame Status bits.
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/ethernet/renesas/sh_eth.c | 15 +++++++++++----
1 file changed, 11 insertions(+), 4 deletions(-)
--- a/drivers/net/ethernet/renesas/sh_eth.c
+++ b/drivers/net/ethernet/renesas/sh_eth.c
@@ -1100,16 +1100,23 @@ static int sh_eth_rx(struct net_device *
desc_status = edmac_to_cpu(mdp, rxdesc->status);
pkt_len = rxdesc->frame_length;
-#if defined(CONFIG_ARCH_R8A7740)
- desc_status >>= 16;
-#endif
-
if (--boguscnt < 0)
break;
if (!(desc_status & RDFEND))
ndev->stats.rx_length_errors++;
+#if defined(CONFIG_ARCH_R8A7740)
+ /*
+ * In case of almost all GETHER/ETHERs, the Receive Frame State
+ * (RFS) bits in the Receive Descriptor 0 are from bit 9 to
+ * bit 0. However, in case of the R8A7740's GETHER, the RFS
+ * bits are from bit 25 to bit 16. So, the driver needs right
+ * shifting by 16.
+ */
+ desc_status >>= 16;
+#endif
+
if (desc_status & (RD_RFS1 | RD_RFS2 | RD_RFS3 | RD_RFS4 |
RD_RFS5 | RD_RFS6 | RD_RFS10)) {
ndev->stats.rx_errors++;
Patches currently in stable-queue which might be from yoshihiro.shimoda.uh@xxxxxxxxxxx are
queue-3.9/net-sh_eth-fix-incorrect-rx-length-error-if-r8a7740.patch
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