Subject: Re: [PATCH 1/1] make network DMA usable for non-tcp drivers

From: Andrew Morton <[email-masked]>
Date: Fri, 8 Jun 2007 12:07:16 -0700

On Fri, 8 Jun 2007 10:30:53 -0400
"Ed L. Cashin" <[email-masked]> wrote:

> Here is a patch against the netdev-2.6 git tree that makes the net DMA
> feature usable for drivers like the ATA over Ethernet block driver,
> which can use dma_skb_copy_datagram_iovec when receiving data from the
> network.
> 
> The change was suggested on kernelnewbies.
> 
>   http://article.gmane.org/gmane.linux.kernel.kernelnewbies/21663
> 
> Signed-off-by: Ed L. Cashin <[email-masked]>
> ---
>  drivers/dma/Kconfig |    2 +-
>  net/core/user_dma.c |    2 ++
>  2 files changed, 3 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
> index 72be6c6..270d23e 100644
> --- a/drivers/dma/Kconfig
> +++ b/drivers/dma/Kconfig
> @@ -14,7 +14,7 @@ config DMA_ENGINE
>  comment "DMA Clients"
>  
>  config NET_DMA
> -	bool "Network: TCP receive copy offload"
> +	bool "Network: receive copy offload"
>  	depends on DMA_ENGINE && NET
>  	default y
>  	---help---
> diff --git a/net/core/user_dma.c b/net/core/user_dma.c
> index 0ad1cd5..69d0b15 100644
> --- a/net/core/user_dma.c
> +++ b/net/core/user_dma.c
> @@ -130,3 +130,5 @@ end:
>  fault:
>  	return -EFAULT;
>  }
> +
> +EXPORT_SYMBOL(dma_skb_copy_datagram_iovec);

We wouldn't want to merge this until code which actually uses the export is
also merged.