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Date: Sun, 31 Jan 2010 13:58:19 +0100
From: Andreas Mohr <andi@...as.de>
To: David Miller <davem@...emloft.net>, Arnd Bergmann <arnd@...db.de>,
David Hollis <dhollis@...ehollis.com>,
Phil Chang <pchang23@...global.net>
Cc: netdev@...r.kernel.org, linux-usb@...r.kernel.org
Subject: [PATCH 1/4] MCS7830 USB-Ether: add Rx error support
ChangeLog:
- evaluate Rx error statistics from trailing Rx status byte
- add driver TODO list
- add myself to authors
Quilt series run-tested, based on 2.6.33-rc4 (net-2.6.git mcs7830 has idle history,
should be good to go).
Signed-off-by: Andreas Mohr <andi@...as.de>
Index: linux-2.6.33-rc4/drivers/net/usb/mcs7830.c
===================================================================
--- linux-2.6.33-rc4.orig/drivers/net/usb/mcs7830.c 2010-01-31 07:29:11.000000000 +0100
+++ linux-2.6.33-rc4/drivers/net/usb/mcs7830.c 2010-01-31 12:59:56.000000000 +0100
@@ -3,11 +3,27 @@
*
* based on usbnet.c, asix.c and the vendor provided mcs7830 driver
*
+ * Copyright (C) 2010 Andreas Mohr <andi@...as.de>
* Copyright (C) 2006 Arnd Bergmann <arnd@...db.de>
* Copyright (C) 2003-2005 David Hollis <dhollis@...ehollis.com>
* Copyright (C) 2005 Phil Chang <pchang23@...global.net>
* Copyright (c) 2002-2003 TiVo Inc.
*
+ * Definitions gathered from MOSCHIP, Data Sheet_7830DA.pdf (thanks!).
+ *
+ * TODO:
+ * - add .reset_resume support (iface is _gone_ after resume w/ power loss)
+ * - verify that mcs7830_get_regs() does have same output pre-/post-suspend
+ * - support HIF_REG_CONFIG_SLEEPMODE/HIF_REG_CONFIG_TXENABLE (via autopm?)
+ * - implement ethtool_ops get_pauseparam/set_pauseparam
+ * via HIF_REG_PAUSE_THRESHOLD (>= revision C only!)
+ * - implement get_eeprom/[set_eeprom]
+ * - switch PHY on/off on ifup/ifdown (perhaps in usbnet.c, via MII)
+ * - mcs7830_get_regs() handling is weird: for rev 2 we return 32 regs,
+ * can access only ~ 24, remaining user buffer is uninitialized garbage
+ * - anything else?
+ *
+ *
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
@@ -83,6 +99,17 @@
HIF_REG_PAUSE_THRESHOLD_DEFAULT = 0,
};
+/* Trailing status byte in Ethernet Rx frame */
+enum {
+ MCS7830_RX_SHORT_FRAME = 0x01, /* < 64 bytes */
+ MCS7830_RX_LENGTH_ERROR = 0x02, /* framelen != Ethernet length field */
+ MCS7830_RX_ALIGNMENT_ERROR = 0x04, /* non-even number of nibbles */
+ MCS7830_RX_CRC_ERROR = 0x08,
+ MCS7830_RX_LARGE_FRAME = 0x10, /* > 1518 bytes */
+ MCS7830_RX_FRAME_CORRECT = 0x20, /* frame is correct */
+ /* [7:6] reserved */
+};
+
struct mcs7830_data {
u8 multi_filter[8];
u8 config;
@@ -539,9 +566,23 @@
skb_trim(skb, skb->len - 1);
status = skb->data[skb->len];
- if (status != 0x20)
+ if (status != MCS7830_RX_FRAME_CORRECT) {
dev_dbg(&dev->udev->dev, "rx fixup status %x\n", status);
+ /* hmm, perhaps usbnet.c already sees a globally visible
+ frame error and increments rx_errors on its own already? */
+ dev->net->stats.rx_errors++;
+
+ if (status & (MCS7830_RX_SHORT_FRAME
+ |MCS7830_RX_LENGTH_ERROR
+ |MCS7830_RX_LARGE_FRAME))
+ dev->net->stats.rx_length_errors++;
+ if (status & MCS7830_RX_ALIGNMENT_ERROR)
+ dev->net->stats.rx_frame_errors++;
+ if (status & MCS7830_RX_CRC_ERROR)
+ dev->net->stats.rx_crc_errors++;
+ }
+
return skb->len > 0;
}
--
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