From: "Shimoda, Yoshihiro" <yoshihiro.shimoda.uh@renesas•com>
To: netdev@vger•kernel.org
Cc: SH-Linux <linux-sh@vger•kernel.org>,
Sergei Shtylyov <sergei.shtylyov@cogentembedded•com>
Subject: [PATCH net-next] net: sh_eth: fix incorrect RX length error if R8A7740
Date: Wed, 12 Jun 2013 10:33:47 +0900 [thread overview]
Message-ID: <51B7CFFB.7090801@renesas.com> (raw)
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@renesas•com>
---
This patch is based on the latest net-next.git.
drivers/net/ethernet/renesas/sh_eth.c | 15 +++++++++++----
1 files changed, 11 insertions(+), 4 deletions(-)
diff --git a/drivers/net/ethernet/renesas/sh_eth.c b/drivers/net/ethernet/renesas/sh_eth.c
index 43d8490..ab2f9c2 100644
--- a/drivers/net/ethernet/renesas/sh_eth.c
+++ b/drivers/net/ethernet/renesas/sh_eth.c
@@ -1260,16 +1260,23 @@ static int sh_eth_rx(struct net_device *ndev, u32 intr_status)
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 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++;
--
1.7.1
next reply other threads:[~2013-06-12 1:33 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-12 1:33 Shimoda, Yoshihiro [this message]
2013-06-12 14:15 ` [PATCH net-next] net: sh_eth: fix incorrect RX length error if R8A7740 Sergei Shtylyov
2013-06-12 19:13 ` Sergei Shtylyov
2013-06-12 19:55 ` David Miller
2013-06-12 20:03 ` Sergei Shtylyov
2013-06-12 19:25 ` Sergei Shtylyov
2013-06-13 0:57 ` Shimoda, Yoshihiro
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