[PATCH] net: ethernet: xilinx: Mark XILINX_LL_TEMAC broken on 64-bit

[PATCH] net: ethernet: xilinx: Mark XILINX_LL_TEMAC broken on 64-bit

[Geert Uytterhoeven]

On 64-bit (e.g. powerpc64/allmodconfig):

    drivers/net/ethernet/xilinx/ll_temac_main.c: In function 'temac_start_xmit_done':
    drivers/net/ethernet/xilinx/ll_temac_main.c:633:22: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
	dev_kfree_skb_irq((struct sk_buff *)cur_p->app4);
			  ^

cdmac_bd.app4 is u32, so it is too small to hold a kernel pointer.

Note that several other fields in struct cdmac_bd are also too small to
hold physical addresses on 64-bit platforms.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
---
 drivers/net/ethernet/xilinx/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ethernet/xilinx/Kconfig b/drivers/net/ethernet/xilinx/Kconfig
index 6d68c8a8f4f2ac7f..da4ec575ccf9ba4a 100644
--- a/drivers/net/ethernet/xilinx/Kconfig
+++ b/drivers/net/ethernet/xilinx/Kconfig
@@ -34,6 +34,7 @@ config XILINX_AXI_EMAC
 config XILINX_LL_TEMAC
 	tristate "Xilinx LL TEMAC (LocalLink Tri-mode Ethernet MAC) driver"
 	depends on (PPC || MICROBLAZE)
+	depends on !64BIT || BROKEN
 	select PHYLIB
 	---help---
 	  This driver supports the Xilinx 10/100/1000 LocalLink TEMAC
-- 
2.7.4

Re: [PATCH] net: ethernet: xilinx: Mark XILINX_LL_TEMAC broken on 64-bit

[Michal Simek]

On 29.11.2017 11:01, Geert Uytterhoeven wrote:
> On 64-bit (e.g. powerpc64/allmodconfig):
> 
>     drivers/net/ethernet/xilinx/ll_temac_main.c: In function 'temac_start_xmit_done':
>     drivers/net/ethernet/xilinx/ll_temac_main.c:633:22: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
> 	dev_kfree_skb_irq((struct sk_buff *)cur_p->app4);
> 			  ^
> 
> cdmac_bd.app4 is u32, so it is too small to hold a kernel pointer.
> 
> Note that several other fields in struct cdmac_bd are also too small to
> hold physical addresses on 64-bit platforms.
> 
> Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
> ---
>  drivers/net/ethernet/xilinx/Kconfig | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/net/ethernet/xilinx/Kconfig b/drivers/net/ethernet/xilinx/Kconfig
> index 6d68c8a8f4f2ac7f..da4ec575ccf9ba4a 100644
> --- a/drivers/net/ethernet/xilinx/Kconfig
> +++ b/drivers/net/ethernet/xilinx/Kconfig
> @@ -34,6 +34,7 @@ config XILINX_AXI_EMAC
>  config XILINX_LL_TEMAC
>  	tristate "Xilinx LL TEMAC (LocalLink Tri-mode Ethernet MAC) driver"
>  	depends on (PPC || MICROBLAZE)
> +	depends on !64BIT || BROKEN
>  	select PHYLIB
>  	---help---
>  	  This driver supports the Xilinx 10/100/1000 LocalLink TEMAC
> 

Yes. This IP is available only on big endian 32bit systems.

Thanks,
Michal

Re: [PATCH] net: ethernet: xilinx: Mark XILINX_LL_TEMAC broken on 64-bit

[David Miller]

From: Geert Uytterhoeven <geert+renesas@glider.be>
Date: Wed, 29 Nov 2017 11:01:09 +0100

> On 64-bit (e.g. powerpc64/allmodconfig):
> 
>     drivers/net/ethernet/xilinx/ll_temac_main.c: In function 'temac_start_xmit_done':
>     drivers/net/ethernet/xilinx/ll_temac_main.c:633:22: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
> 	dev_kfree_skb_irq((struct sk_buff *)cur_p->app4);
> 			  ^
> 
> cdmac_bd.app4 is u32, so it is too small to hold a kernel pointer.
> 
> Note that several other fields in struct cdmac_bd are also too small to
> hold physical addresses on 64-bit platforms.
> 
> Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

Yeah, I can't see much value in implementing a hash table converting between
32-bit cookies and 64-bit points just for this if it'll never be actually
used.

Applied, thanks Geert.