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SubjectPATCH: Re: 2.6.0-test3+sk98lin driver with hardware bug make eth unusable
Date
On Tuesday 12 August 2003 13:54, Alan Cox shaped the electrons to shout:
> > There is a ASIC bug in several popular motherboards (including ASUS ones)
> > related to TX hardware checksum.
>
> The checksum comes off the SK hardware
>
> > For packets smaller that 56 bytes (payload), as UDP dns queries, the asic
> > generates a bad checksum making the drivers unusable for "normal"
> > Internet usage:
>
> Sounds like broken padding handling for small frames, if so let the sw
> checksum handle them.

Find enclosed the patch to make it a Kconfig option. Just tested,
at least it works as a workaround.

Regards,

--
ricardo galli GPG id C8114D34
http://mnm.uib.es/~gallir/


Patch against 2.6.0-test3

diff -r -u linux-2.6.0-test3/drivers/net/Kconfig linux-2.6.0-test3-new/drivers/net/Kconfig
--- linux-2.6.0-test3/drivers/net/Kconfig 2003-08-10 17:34:29.000000000 +0200
+++ linux-2.6.0-test3-new/drivers/net/Kconfig 2003-08-12 13:47:50.000000000 +0200
@@ -2107,6 +2107,13 @@
say M here and read Documentation/modules.txt. This is recommended.
The module will be called sk98lin.o.

+config SK98LIN_TX_CHECKSUM
+ bool "Use hardware TX checksum"
+ depends on SK98LIN
+ help
+ Some chips have a hardware bugs that generate wrong
+ checksums in small packets. If unsure, say No.
+
config CONFIG_SK98LIN_T1
bool "3Com 3C940/3C941 Gigabit Ethernet Adapter"
depends on SK98LIN
diff -r -u linux-2.6.0-test3/drivers/net/sk98lin/skge.c linux-2.6.0-test3-new/drivers/net/sk98lin/skge.c
--- linux-2.6.0-test3/drivers/net/sk98lin/skge.c 2003-08-10 17:33:18.000000000 +0200
+++ linux-2.6.0-test3-new/drivers/net/sk98lin/skge.c 2003-08-12 13:50:41.000000000 +0200
@@ -422,8 +422,12 @@
/* for debuging on x86 only */
/* #define BREAKPOINT() asm(" int $3"); */

+#ifdef CONFIG_SK98LIN_TX_CHECKSUM
/* use the transmit hw checksum driver functionality */
-#define USE_SK_TX_CHECKSUM
+ #define USE_SK_TX_CHECKSUM
+#else
+ #undef USE_SK_TX_CHECKSUM
+#endif

/* use the receive hw checksum driver functionality */
#define USE_SK_RX_CHECKSUM
-
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