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SubjectRe: [net-next PATCH 2/3] octeontx2-af: Add devlink health reporters for NPA
Date
Hi Willem,

Thanks for the review.

> -----Original Message-----
> From: Willem de Bruijn <willemdebruijn.kernel@gmail.com>
> Sent: Monday, November 2, 2020 7:12 PM
> To: George Cherian <gcherian@marvell.com>
> Cc: Network Development <netdev@vger.kernel.org>; linux-kernel <linux-
> kernel@vger.kernel.org>; Jakub Kicinski <kuba@kernel.org>; David Miller
> <davem@davemloft.net>; Sunil Kovvuri Goutham
> <sgoutham@marvell.com>; Linu Cherian <lcherian@marvell.com>;
> Geethasowjanya Akula <gakula@marvell.com>; masahiroy@kernel.org
> Subject: Re: [net-next PATCH 2/3] octeontx2-af: Add devlink health
> reporters for NPA
>
> On Mon, Nov 2, 2020 at 12:07 AM George Cherian
> <george.cherian@marvell.com> wrote:
> >
> > Add health reporters for RVU NPA block.
> > Only reporter dump is supported
> >
> > Output:
> > # devlink health
> > pci/0002:01:00.0:
> > reporter npa
> > state healthy error 0 recover 0
> > # devlink health dump show pci/0002:01:00.0 reporter npa
> > NPA_AF_GENERAL:
> > Unmap PF Error: 0
> > Free Disabled for NIX0 RX: 0
> > Free Disabled for NIX0 TX: 0
> > Free Disabled for NIX1 RX: 0
> > Free Disabled for NIX1 TX: 0
> > Free Disabled for SSO: 0
> > Free Disabled for TIM: 0
> > Free Disabled for DPI: 0
> > Free Disabled for AURA: 0
> > Alloc Disabled for Resvd: 0
> > NPA_AF_ERR:
> > Memory Fault on NPA_AQ_INST_S read: 0
> > Memory Fault on NPA_AQ_RES_S write: 0
> > AQ Doorbell Error: 0
> > Poisoned data on NPA_AQ_INST_S read: 0
> > Poisoned data on NPA_AQ_RES_S write: 0
> > Poisoned data on HW context read: 0
> > NPA_AF_RVU:
> > Unmap Slot Error: 0
> >
> > Signed-off-by: Sunil Kovvuri Goutham <sgoutham@marvell.com>
> > Signed-off-by: Jerin Jacob <jerinj@marvell.com>
> > Signed-off-by: George Cherian <george.cherian@marvell.com>
>
>
> > +static bool rvu_npa_af_request_irq(struct rvu *rvu, int blkaddr, int offset,
> > + const char *name, irq_handler_t fn)
> > +{
> > + struct rvu_devlink *rvu_dl = rvu->rvu_dl;
> > + int rc;
> > +
> > + WARN_ON(rvu->irq_allocated[offset]);
>
> Please use WARN_ON sparingly for important unrecoverable events. This
> seems like a basic precondition. If it can happen at all, can probably catch in a
> normal branch with a netdev_err. The stacktrace in the oops is not likely to
> point at the source of the non-zero value, anyway.
Okay, will fix it in v2.
>
> > + rvu->irq_allocated[offset] = false;
>
> Why initialize this here? Are these fields not zeroed on alloc? Is this here only
> to safely call rvu_npa_unregister_interrupts on partial alloc? Then it might be
> simpler to just have jump labels in this function to free the successfully
> requested irqs.

It shouldn't be initialized like this; it is zeroed on alloc.
Will fix in v2.
>
> > + sprintf(&rvu->irq_name[offset * NAME_SIZE], name);
> > + rc = request_irq(pci_irq_vector(rvu->pdev, offset), fn, 0,
> > + &rvu->irq_name[offset * NAME_SIZE], rvu_dl);
> > + if (rc)
> > + dev_warn(rvu->dev, "Failed to register %s irq\n", name);
> > + else
> > + rvu->irq_allocated[offset] = true;
> > +
> > + return rvu->irq_allocated[offset]; }
>
> > +static int rvu_npa_health_reporters_create(struct rvu_devlink
> > +*rvu_dl) {
> > + struct devlink_health_reporter *rvu_npa_health_reporter;
> > + struct rvu_npa_event_cnt *npa_event_count;
> > + struct rvu *rvu = rvu_dl->rvu;
> > +
> > + npa_event_count = kzalloc(sizeof(*npa_event_count), GFP_KERNEL);
> > + if (!npa_event_count)
> > + return -ENOMEM;
> > +
> > + rvu_dl->npa_event_cnt = npa_event_count;
> > + rvu_npa_health_reporter = devlink_health_reporter_create(rvu_dl-
> >dl,
> > + &rvu_npa_hw_fault_reporter_ops,
> > + 0, rvu);
> > + if (IS_ERR(rvu_npa_health_reporter)) {
> > + dev_warn(rvu->dev, "Failed to create npa reporter, err =%ld\n",
> > + PTR_ERR(rvu_npa_health_reporter));
> > + return PTR_ERR(rvu_npa_health_reporter);
> > + }
> > +
> > + rvu_dl->rvu_npa_health_reporter = rvu_npa_health_reporter;
> > + return 0;
> > +}
> > +
> > +static void rvu_npa_health_reporters_destroy(struct rvu_devlink
> > +*rvu_dl) {
> > + if (!rvu_dl->rvu_npa_health_reporter)
> > + return;
> > +
> > +
> > +devlink_health_reporter_destroy(rvu_dl->rvu_npa_health_reporter);
> > +}
> > +
> > +static int rvu_health_reporters_create(struct rvu *rvu) {
> > + struct rvu_devlink *rvu_dl;
> > +
> > + if (!rvu->rvu_dl)
> > + return -EINVAL;
> > +
> > + rvu_dl = rvu->rvu_dl;
> > + return rvu_npa_health_reporters_create(rvu_dl);
>
> No need for local var rvu_dl. Here and below.
>
> Without that, the entire helper is probably not needed.

This helper is needed as we add support for more HW blocks.

>
> > +}
> > +
> > +static void rvu_health_reporters_destroy(struct rvu *rvu) {
> > + struct rvu_devlink *rvu_dl;
> > +
> > + if (!rvu->rvu_dl)
> > + return;
> > +
> > + rvu_dl = rvu->rvu_dl;
> > + rvu_npa_health_reporters_destroy(rvu_dl);
> > +}
> > +
> > static int rvu_devlink_info_get(struct devlink *devlink, struct
> devlink_info_req *req,
> > struct netlink_ext_ack *extack) { @@
> > -53,7 +483,8 @@ int rvu_register_dl(struct rvu *rvu)
> > rvu_dl->dl = dl;
> > rvu_dl->rvu = rvu;
> > rvu->rvu_dl = rvu_dl;
> > - return 0;
> > +
> > + return rvu_health_reporters_create(rvu);
>
> when would this be called with rvu->rvu_dl == NULL?

During initialization.

Regards,
-George
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