How to Enable Hardware Checksum on Intel 82546 GBE and e1000-4.4.19 driver

From: shesha bhushan (
Date: Thu Feb 13 2003 - 23:05:52 EST

Hi all,

I am attempting to simulate zerocopy on my machine and I am just learning
kernel hacking (very naive). I have Intel 82546 GBE and e1000-4.4.19
drivers for it.

I have commented out the calls to csum_and_copy_from_user() function in
both tcp_copy_to_page and skb_add_data functions in linux/net/ipv4/tcp.c,
which essentialy does the copy of data form the user space to kernel space
and calulates checksum.
Can any one tell me how to enable the hardware checksumming, so that
hardware calculates the correct checksum on the (Non relevant) data present
in the kernel buffer and the receiveing end should think that all went fine.
In addition to setting some parameter in the driver, I think I must set some
parameters at the tcp level so the driver realizes that checksum is not done
in the above layers and must be don by hardware when it reseives the skbuff.

Thanking You

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