Re: Are "skb->data" physically continuous?

[Shmulik Hen (shmulik.hen@intel.com)]

On Sunday 14 September 2003 01:41 am, Nick Patavalis wrote:
> this assumption, but I have also heard that "zero-copy" networking
> was added to the kernel at some point. Zero-copy indicates that
> data come directly for user-space and, hence, they might be
> non-continuous.
>

You may want to take a look at e100_main.c in one of the latest 2.4.x 
kernels. There you should be able to see how to deal with 
dev->features and the flags NETIF_F_SG for scatter-gather 
capabilities and NETIF_F_*_CSUM for checksum offloading capabilities.
Zero-copy was added in 2.4.4, and is a combination of the above. Also, 
take a look at skbuff.h for MAX_SKB_FRAGS and struct skb_shared_info 
and their use in the kernel code.

-- 
| Shmulik Hen   Advanced Network Services  |
| Israel Design Center, Jerusalem          |
| LAN Access Division, Platform Networking |
| Intel Communications Group, Intel corp.  |

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