Re: [net PATCH v2 3/7] octeontx2-af: Add validation for lmac type

[Sai Krishna Gajula]

Please see inline,

> -----Original Message-----
> From: Leon Romanovsky <leon@xxxxxxxxxx>
> Sent: Sunday, April 9, 2023 11:00 PM
> To: Sai Krishna Gajula <saikrishnag@xxxxxxxxxxx>
> Cc: davem@xxxxxxxxxxxxx; edumazet@xxxxxxxxxx; kuba@xxxxxxxxxx;
> pabeni@xxxxxxxxxx; netdev@xxxxxxxxxxxxxxx; linux-
> kernel@xxxxxxxxxxxxxxx; Sunil Kovvuri Goutham <sgoutham@xxxxxxxxxxx>;
> Geethasowjanya Akula <gakula@xxxxxxxxxxx>; richardcochran@xxxxxxxxx;
> Linu Cherian <lcherian@xxxxxxxxxxx>; Jerin Jacob Kollanukkaran
> <jerinj@xxxxxxxxxxx>; Hariprasad Kelam <hkelam@xxxxxxxxxxx>;
> Subbaraya Sundeep Bhatta <sbhatta@xxxxxxxxxxx>
> Subject: Re: [net PATCH v2 3/7] octeontx2-af: Add validation for lmac
> type

> On Fri, Apr 07, 2023 at 05:53:40PM +0530, Sai Krishna wrote:
> > From: Hariprasad Kelam <hkelam@xxxxxxxxxxx>
> >
> > Upon physical link change, firmware reports to the kernel about the
> > change along with the details like speed, lmac_type_id, etc.
> > Kernel derives lmac_type based on lmac_type_id received from firmware.
> >
> > In a few scenarios, firmware returns an invalid lmac_type_id, which is
> > resulting in below kernel panic. This patch adds the missing
> > validation of the lmac_type_id field.
> >
> > Internal error: Oops: 96000005 [#1] PREEMPT SMP
> > [   35.321595] Modules linked in:
> > [   35.328982] CPU: 0 PID: 31 Comm: kworker/0:1 Not tainted
> > 5.4.210-g2e3169d8e1bc-dirty #17
> > [   35.337014] Hardware name: Marvell CN103XX board (DT)
> > [   35.344297] Workqueue: events work_for_cpu_fn
> > [   35.352730] pstate: 40400089 (nZcv daIf +PAN -UAO)
> > [   35.360267] pc : strncpy+0x10/0x30
> > [   35.366595] lr : cgx_link_change_handler+0x90/0x180
> >
> > Fixes: 61071a871ea6 ("octeontx2-af: Forward CGX link notifications to
> > PFs")
> > Signed-off-by: Hariprasad Kelam <hkelam@xxxxxxxxxxx>
> > Signed-off-by: Sunil Kovvuri Goutham <sgoutham@xxxxxxxxxxx>
> > Signed-off-by: Sai Krishna <saikrishnag@xxxxxxxxxxx>
> >
> 
> Your patch missing --- trailers and probably won't apply correctly.
> 
We will fix trailers errors in V3 patch.

Thanks,
Sai
> Thanks
> 
> >  drivers/net/ethernet/marvell/octeontx2/af/cgx.c | 8 ++++++++
> >  1 file changed, 8 insertions(+)
> >
> > diff --git a/drivers/net/ethernet/marvell/octeontx2/af/cgx.c
> > b/drivers/net/ethernet/marvell/octeontx2/af/cgx.c
> > index 724df6398bbe..bd77152bb8d7 100644
> > --- a/drivers/net/ethernet/marvell/octeontx2/af/cgx.c
> > +++ b/drivers/net/ethernet/marvell/octeontx2/af/cgx.c
> > @@ -1231,6 +1231,14 @@ static inline void link_status_user_format(u64
> lstat,
> >  	linfo->an = FIELD_GET(RESP_LINKSTAT_AN, lstat);
> >  	linfo->fec = FIELD_GET(RESP_LINKSTAT_FEC, lstat);
> >  	linfo->lmac_type_id = FIELD_GET(RESP_LINKSTAT_LMAC_TYPE,
> lstat);
> > +
> > +	if (linfo->lmac_type_id >= LMAC_MODE_MAX) {
> > +		dev_err(&cgx->pdev->dev, "Unknown lmac_type_id %d
> reported by firmware on cgx port%d:%d",
> > +			linfo->lmac_type_id, cgx->cgx_id, lmac_id);
> > +		strncpy(linfo->lmac_type, "Unknown", LMACTYPE_STR_LEN -
> 1);
> > +		return;
> > +	}
> > +
> >  	lmac_string = cgx_lmactype_string[linfo->lmac_type_id];
> >  	strncpy(linfo->lmac_type, lmac_string, LMACTYPE_STR_LEN - 1);  }
> > --
> > 2.25.1
> >