Hi. Attached is a patch which enables jumbo frames on DS2104x based boards. The maximum supported MTU is 4066 bytes (but see below). Room for a VLAN tag is included. The maximum supported MTU is about twice as large as in my first jumbo frame patch because both buffers of RX and TX descriptors are used (just like the winbond-840 driver on TX). The media tables have been adjusted to disable the RX watchdog and TX jabber timers. Tested with a DS21041 and an MTU of 3544 on BNC media with an NE3200 board at the other end without problems. Known bugs and problems: 1. Although the DS21143 manual says that the RX frame descriptor size field is 14 bits wide, the DS21041 seems to use only 11 bits. This means that frames larger than 1518+2048 bytes can not be told apart from frames larger than 1518 bytes but smaller than 2048 bytes. As a result, setting the MTU larger than 3544 will cause problems. Please report success or failure with this patch. -- Regards, Rask Ingemann Lambertsen - : send the line "unsubscribe linux-net" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
