netdev - Re: Face some error after applying commit 7dfa4b414d4(net/mlx4

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Date:	Sun, 09 Nov 2014 18:46:14 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Wei Yang <weiyang@...ux.vnet.ibm.com>
Cc:	Eric Dumazet <edumazet@...gle.com>,
	Amir Vadai <amirv@...lanox.com>,
	David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: Face some error after applying commit 7dfa4b414d4(net/mlx4_en:
 Code cleanups in tx path)

On Mon, 2014-11-10 at 09:59 +0800, Wei Yang wrote:
> On Fri, Nov 07, 2014 at 07:38:15PM -0800, Eric Dumazet wrote:
> >On Fri, Nov 7, 2014 at 6:57 PM, Wei Yang <weiyang@...ux.vnet.ibm.com> wrote:
> >> Eric and Amir
> >>
> >> I am testing the VF on PowerNV platform with 3.18-rc2.
> >> After applying this patch I face some errors.
> >>
> >> First is the compiling error.
> >>
> >>     drivers/net/ethernet/mellanox/mlx4//en_tx.c: In function ‘mlx4_en_xmit’:
> >>     drivers/net/ethernet/mellanox/mlx4//en_tx.c:802:8: error: ‘shinfo’ undeclared (first use in this function)
> >>             shinfo->tx_flags & SKBTX_HW_TSTAMP)) {
> >>             ^
> >>     include/linux/compiler.h:160:42: note: in definition of macro ‘unlikely’
> >>      # define unlikely(x) __builtin_expect(!!(x), 0)
> >>                                               ^
> >>     drivers/net/ethernet/mellanox/mlx4//en_tx.c:802:8: note: each undeclared identifier is reported only once for each function it appears in
> >>             shinfo->tx_flags & SKBTX_HW_TSTAMP)) {
> >>             ^
> >>     include/linux/compiler.h:160:42: note: in definition of macro ‘unlikely’
> >>      # define unlikely(x) __builtin_expect(!!(x), 0)
> >>                                               ^
> >>     make[1]: *** [drivers/net/ethernet/mellanox/mlx4//en_tx.o] Error 1
> >>     make: *** [_module_drivers/net/ethernet/mellanox/mlx4/] Error 2
> >>
> >
> >
> >This compilation error seems strange.
> >
> >Are you sure your tree is pristine, not corrupted in any way ?
> 
> I believe I did the revert one by one with git revert.
> 
> >
> >
> >> I tried to fix this with following change:
> >>
> >>     [root@...n-lp1 3.18]# git diff
> >>     diff --git a/drivers/net/ethernet/mellanox/mlx4/en_tx.c b/drivers/net/ethernet/m
> >>     index eaf23eb..d2f06a7 100644
> >>     --- a/drivers/net/ethernet/mellanox/mlx4/en_tx.c
> >>     +++ b/drivers/net/ethernet/mellanox/mlx4/en_tx.c
> >>     @@ -799,8 +799,8 @@ netdev_tx_t mlx4_en_xmit(struct sk_buff *skb, struct net_dev
> >>              * set flag for further reference
> >>              */
> >>             if (unlikely(ring->hwtstamp_tx_type == HWTSTAMP_TX_ON &&
> >>     -                    shinfo->tx_flags & SKBTX_HW_TSTAMP)) {
> >>     -               shinfo->tx_flags |= SKBTX_IN_PROGRESS;
> >>     +                    skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP)) {
> >>     +               skb_shinfo(skb)->tx_flags |= SKBTX_IN_PROGRESS;
> >>                     tx_info->ts_requested = 1;
> >>             }
> >>
> >> But seems to face another error.
> >>
> >
> >I suspect your tree is not the official tree, I do not see how you got
> >this compilation error.
> 
> 
> I checked the upstream git tree again, and find this commit:
> 
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=7dfa4b414d4eec8da56e44fb2b4aea3e549b092f
> 
> 
> And I want to say the shinfo local variable is introduced in commit:
> 
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b9d8839a44092cb4268ef2813c34d5dbf3363603
> 
> And in my log tree, also checked the upstream, this one is applyed after the
> first one. And the compiling error will disappear untill I apply this one.
> 
> So this compiling issue can't reproduced at your side? You have reset --hard
> to the "Code cleanup" one, and can't see the error? That is strange.
> 

Okay, your message was not clear : I thought you had a compilation error
on current tree.

The true story of these patches is that Mellanox split an initial big
chunk [1] I gave into multiple patches.

Maybe they missed that one patch did not actually compile.

[1] https://patchwork.ozlabs.org/patch/394256/

Now, it is done, there is nothing we can do.

I'll let Mellanox comment, but it looks like your hardware does not like
something.

Have you tried to disable Blue Frame ?


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