netdev - Re: [PATCH v1 3/4] net: netcp: rename {get/set}pad_info to {get/set}_sw

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Date:	Fri, 19 Feb 2016 15:37:51 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Murali Karicheri <m-karicheri2@...com>
Cc:	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	davem@...emloft.net
Subject: Re: [PATCH v1 3/4] net: netcp: rename {get/set}pad_info to {get/set}_sw_data

On Thursday 18 February 2016 14:46:16 Murali Karicheri wrote:
> Rename the helpers to match with the updated dma desc field sw_data.
> 
> Cc: Wingman Kwok <w-kwok2@...com>
> Cc: Mugunthan V N <mugunthanvnm@...com>
> CC: Arnd Bergmann <arnd@...db.de>
> CC: Grygorii Strashko <grygorii.strashko@...com>
> CC: David Laight <David.Laight@...LAB.COM>
> Signed-off-by: Murali Karicheri <m-karicheri2@...com>
> ---
>  v1 - new patch to based on discussion at
> 	https://patchwork.ozlabs.org/patch/580860/
>  drivers/net/ethernet/ti/netcp_core.c | 40 +++++++++++++++++++-----------------
>  1 file changed, 21 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/net/ethernet/ti/netcp_core.c b/drivers/net/ethernet/ti/netcp_core.c
> index 0b26e52..1d07cca 100644
> --- a/drivers/net/ethernet/ti/netcp_core.c
> +++ b/drivers/net/ethernet/ti/netcp_core.c
> @@ -117,10 +117,11 @@ static void get_pkt_info(dma_addr_t *buff, u32 *buff_len, dma_addr_t *ndesc,
>  	*ndesc = le32_to_cpu(desc->next_desc);
>  }
>  
> -static void get_pad_info(u32 *pad0, u32 *pad1, struct knav_dma_desc *desc)
> +static void get_sw_data(u32 *data0, u32 *data1, struct knav_dma_desc *desc)
>  {
> -	*pad0 = le32_to_cpu(desc->pad[0]);
> -	*pad1 = le32_to_cpu(desc->pad[1]);
> +	/* No Endian conversion needed as this data is untouched by hw */
> +	*data0 = desc->sw_data[0];
> +	*data1 = desc->sw_data[1];
>  }

Actually this needs to be done together with patch 2, or you
get a build failure if this one is not yet applied.

> @@ -1174,7 +1176,7 @@ static int netcp_tx_submit_skb(struct netcp_intf *netcp,
>  	}
>  
>  	set_words(&tmp, 1, &desc->packet_info);
> -	set_words((u32 *)&skb, 1, &desc->pad[0]);
> +	set_words((u32 *)&skb, 1, &desc->sw_data[0]);
>  
>  	if (tx_pipe->flags & SWITCH_TO_PORT_IN_TAGINFO) {
>  		tmp = tx_pipe->switch_to_port;
> 

This seems to introduce a bug, and should produce an "sparse" warning
about a u32 being passed into a function expecting a __le32.

The other bug I originally tried to address here is the way an indirect
pointer is converted to a 'u32' pointer, which won't work on 64-bit
architectures when pointers are wider than u32. Maybe at least put a
comment here that this is a known deficiency.

	Arnd