linux-kernel - Re: linux-next: Tree for Dec 3 (switchdev & TI_CPSW

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Date:   Wed, 4 Dec 2019 17:35:23 +0200
From:   Grygorii Strashko <grygorii.strashko@...com>
To:     Randy Dunlap <rdunlap@...radead.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Linux Next Mailing List <linux-next@...r.kernel.org>
CC:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Jiri Pirko <jiri@...nulli.us>,
        Ivan Vecera <ivecera@...hat.com>, <linux-omap@...r.kernel.org>
Subject: Re: linux-next: Tree for Dec 3 (switchdev & TI_CPSW_SWITCHDEV)



On 04/12/2019 01:43, Randy Dunlap wrote:
> On 12/2/19 8:54 PM, Stephen Rothwell wrote:
>> Hi all,
>>
>> Please do not add any material for v5.6 to your linux-next included
>> trees until after v5.5-rc1 has been released.
>>
>> Changes since 20191202:
> 
> I am seeing this (happens to be on i386; I doubt that it matters):
> CONFIG_COMPILE_TEST=y
> 
> 
> WARNING: unmet direct dependencies detected for NET_SWITCHDEV
>    Depends on [n]: NET [=y] && INET [=n]
>    Selected by [y]:
>    - TI_CPSW_SWITCHDEV [=y] && NETDEVICES [=y] && ETHERNET [=y] && NET_VENDOR_TI [=y] && (ARCH_DAVINCI || ARCH_OMAP2PLUS || COMPILE_TEST [=y])
> 
> because TI_CPSW_SWITCHDEV blindly selects NET_SWITCHDEV even though
> INET is not set/enabled, while NET_SWITCHDEV depends on INET.
> 
> However, the build succeeds, including net/switchdev/*.
> 
> So why does NET_SWITCHDEV depend on INET?
> 
> It looks like TI_CPSW_SWITCHDEV should depend on INET (based on the
> Kconfig rules), but in practice it doesn't seem to matter to the build.
> 

Thanks for reporting this. I'd like to ask for some advice of how to proceed?
a) change it to "depends on NET_SWITCHDEV" (as it's done in other drivers),
but this will require to add NET_SWITCHDEV in defconfig

b) change it to "imply NET_SWITCHDEV", but then NET_SWITCHDEV can be switched off
manually or by random build and cause build failure of cpsw_new.
To fix build below diff can be used, but TI_CPSW_SWITCHDEV will not be functional

---
diff --git a/drivers/net/ethernet/ti/cpsw_new.c b/drivers/net/ethernet/ti/cpsw_new.c
index 71215db7934b..22e8fc548d48 100644
--- a/drivers/net/ethernet/ti/cpsw_new.c
+++ b/drivers/net/ethernet/ti/cpsw_new.c
@@ -368,8 +368,9 @@ static void cpsw_rx_handler(void *token, int len, int status)
                 page_pool_recycle_direct(pool, page);
                 goto requeue;
         }
-
+#ifdef CONFIG_NET_SWITCHDEV
         skb->offload_fwd_mark = priv->offload_fwd_mark;
+#endif
         skb_reserve(skb, headroom);
         skb_put(skb, len);
         skb->dev = ndev;

Thank you.

-- 
Best regards,
grygorii