[net PATCH] octeontx2-pf: Fix resource leakage in VF driver unbind

[net PATCH] octeontx2-pf: Fix resource leakage in VF driver unbind

[Hariprasad Kelam]

resources allocated like mcam entries to support the Ntuple feature
and hash tables for the tc feature are not getting freed in driver
unbind. This patch fixes the issue.

Fixes: 2da489432747 ("octeontx2-pf: devlink params support to set mcam entry count")
Signed-off-by: Hariprasad Kelam <hkelam@marvell.com>
Signed-off-by: Sunil Kovvuri Goutham <sgoutham@marvell.com>
---
 drivers/net/ethernet/marvell/octeontx2/nic/otx2_vf.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_vf.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_vf.c
index 86653bb8e403..7f8ffbf79cf7 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_vf.c
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_vf.c
@@ -758,6 +758,8 @@ static void otx2vf_remove(struct pci_dev *pdev)
 	if (vf->otx2_wq)
 		destroy_workqueue(vf->otx2_wq);
 	otx2_ptp_destroy(vf);
+	otx2_mcam_flow_del(vf);
+	otx2_shutdown_tc(vf);
 	otx2vf_disable_mbox_intr(vf);
 	otx2_detach_resources(&vf->mbox);
 	if (test_bit(CN10K_LMTST, &vf->hw.cap_flag))
-- 
2.17.1

Re: [net PATCH] octeontx2-pf: Fix resource leakage in VF driver unbind

[Leon Romanovsky]

On Mon, Jan 09, 2023 at 11:43:25AM +0530, Hariprasad Kelam wrote:
> resources allocated like mcam entries to support the Ntuple feature
> and hash tables for the tc feature are not getting freed in driver
> unbind. This patch fixes the issue.

It is not clear where in otx2vf_probe() these resource are allocated.
Please add the stack trace to the commit message.

Thanks

> 
> Fixes: 2da489432747 ("octeontx2-pf: devlink params support to set mcam entry count")
> Signed-off-by: Hariprasad Kelam <hkelam@marvell.com>
> Signed-off-by: Sunil Kovvuri Goutham <sgoutham@marvell.com>
> ---
>  drivers/net/ethernet/marvell/octeontx2/nic/otx2_vf.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_vf.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_vf.c
> index 86653bb8e403..7f8ffbf79cf7 100644
> --- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_vf.c
> +++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_vf.c
> @@ -758,6 +758,8 @@ static void otx2vf_remove(struct pci_dev *pdev)
>  	if (vf->otx2_wq)
>  		destroy_workqueue(vf->otx2_wq);
>  	otx2_ptp_destroy(vf);
> +	otx2_mcam_flow_del(vf);
> +	otx2_shutdown_tc(vf);
>  	otx2vf_disable_mbox_intr(vf);
>  	otx2_detach_resources(&vf->mbox);
>  	if (test_bit(CN10K_LMTST, &vf->hw.cap_flag))
> -- 
> 2.17.1
> 

Re: [net PATCH] octeontx2-pf: Fix resource leakage in VF driver unbind

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net.git (master)
by Paolo Abeni <pabeni@redhat.com>:

On Mon, 9 Jan 2023 11:43:25 +0530 you wrote:
> resources allocated like mcam entries to support the Ntuple feature
> and hash tables for the tc feature are not getting freed in driver
> unbind. This patch fixes the issue.
> 
> Fixes: 2da489432747 ("octeontx2-pf: devlink params support to set mcam entry count")
> Signed-off-by: Hariprasad Kelam <hkelam@marvell.com>
> Signed-off-by: Sunil Kovvuri Goutham <sgoutham@marvell.com>
> 
> [...]

Here is the summary with links:
  - [net] octeontx2-pf: Fix resource leakage in VF driver unbind
    https://git.kernel.org/netdev/net/c/53da7aec3298

You are awesome, thank you!
-- 
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html

Re: [net PATCH] octeontx2-pf: Fix resource leakage in VF driver unbind

[Leon Romanovsky]

On Tue, Jan 10, 2023 at 10:20:15AM +0000, patchwork-bot+netdevbpf@kernel.org wrote:
> Hello:
> 
> This patch was applied to netdev/net.git (master)
> by Paolo Abeni <pabeni@redhat.com>:
> 
> On Mon, 9 Jan 2023 11:43:25 +0530 you wrote:
> > resources allocated like mcam entries to support the Ntuple feature
> > and hash tables for the tc feature are not getting freed in driver
> > unbind. This patch fixes the issue.
> > 
> > Fixes: 2da489432747 ("octeontx2-pf: devlink params support to set mcam entry count")
> > Signed-off-by: Hariprasad Kelam <hkelam@marvell.com>
> > Signed-off-by: Sunil Kovvuri Goutham <sgoutham@marvell.com>
> > 
> > [...]
> 
> Here is the summary with links:
>   - [net] octeontx2-pf: Fix resource leakage in VF driver unbind
>     https://git.kernel.org/netdev/net/c/53da7aec3298

Paolo,

I don't think that this patch should be applied.

It looks like wrong Fixes to me and I don't see clearly how structures
were allocated on VF which were cleared in this patch.

Thanks

> 
> You are awesome, thank you!
> -- 
> Deet-doot-dot, I am a bot.
> https://korg.docs.kernel.org/patchwork/pwbot.html
> 
> 

Re: [net PATCH] octeontx2-pf: Fix resource leakage in VF driver unbind

[Paolo Abeni]

Hello,

On Tue, 2023-01-10 at 12:29 +0200, Leon Romanovsky wrote:
> On Tue, Jan 10, 2023 at 10:20:15AM +0000, patchwork-bot+netdevbpf@kernel.org wrote:
> > Hello:
> > 
> > This patch was applied to netdev/net.git (master)
> > by Paolo Abeni <pabeni@redhat.com>:
> > 
> > On Mon, 9 Jan 2023 11:43:25 +0530 you wrote:
> > > resources allocated like mcam entries to support the Ntuple feature
> > > and hash tables for the tc feature are not getting freed in driver
> > > unbind. This patch fixes the issue.
> > > 
> > > Fixes: 2da489432747 ("octeontx2-pf: devlink params support to set mcam entry count")
> > > Signed-off-by: Hariprasad Kelam <hkelam@marvell.com>
> > > Signed-off-by: Sunil Kovvuri Goutham <sgoutham@marvell.com>
> > > 
> > > [...]
> > 
> > Here is the summary with links:
> >   - [net] octeontx2-pf: Fix resource leakage in VF driver unbind
> >     https://git.kernel.org/netdev/net/c/53da7aec3298
> 
> I don't think that this patch should be applied.
> 
> It looks like wrong Fixes to me and I don't see clearly how structures
> were allocated on VF which were cleared in this patch.

My understanding is that the resource allocation happens via:

otx2_dl_mcam_count_set()

which is registered as the devlink parameter write operation on the vf
by the fixes commit - the patch looks legit to me.

Did I miss something?

Thanks!

Paolo

Re: [net PATCH] octeontx2-pf: Fix resource leakage in VF driver unbind

[Leon Romanovsky]

On Tue, Jan 10, 2023 at 11:43:28AM +0100, Paolo Abeni wrote:
> Hello,
> 
> On Tue, 2023-01-10 at 12:29 +0200, Leon Romanovsky wrote:
> > On Tue, Jan 10, 2023 at 10:20:15AM +0000, patchwork-bot+netdevbpf@kernel.org wrote:
> > > Hello:
> > > 
> > > This patch was applied to netdev/net.git (master)
> > > by Paolo Abeni <pabeni@redhat.com>:
> > > 
> > > On Mon, 9 Jan 2023 11:43:25 +0530 you wrote:
> > > > resources allocated like mcam entries to support the Ntuple feature
> > > > and hash tables for the tc feature are not getting freed in driver
> > > > unbind. This patch fixes the issue.
> > > > 
> > > > Fixes: 2da489432747 ("octeontx2-pf: devlink params support to set mcam entry count")
> > > > Signed-off-by: Hariprasad Kelam <hkelam@marvell.com>
> > > > Signed-off-by: Sunil Kovvuri Goutham <sgoutham@marvell.com>
> > > > 
> > > > [...]
> > > 
> > > Here is the summary with links:
> > >   - [net] octeontx2-pf: Fix resource leakage in VF driver unbind
> > >     https://git.kernel.org/netdev/net/c/53da7aec3298
> > 
> > I don't think that this patch should be applied.
> > 
> > It looks like wrong Fixes to me and I don't see clearly how structures
> > were allocated on VF which were cleared in this patch.
> 
> My understanding is that the resource allocation happens via:
> 
> otx2_dl_mcam_count_set()
> 
> which is registered as the devlink parameter write operation on the vf
> by the fixes commit - the patch looks legit to me.
> 
> Did I miss something?

No, you are right. I'm not sure if I would be able to see that OTX2_FLAG_MCAM_ENTRIES_ALLOC
flag without your hint.

Thanks