netdev - Re: [PATCH net-next v2 10/14] octeontx2-pf: ipsec: Handle NPA threshold interrupt

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Message-ID: <aG98_m30GHBGtLIt@optiplex>
Date: Thu, 10 Jul 2025 14:12:38 +0530
From: Tanmay Jagdale <tanmay@...vell.com>
To: Simon Horman <horms@...nel.org>
CC: <davem@...emloft.net>, <leon@...nel.org>, <sgoutham@...vell.com>,
        <bbhushan2@...vell.com>, <herbert@...dor.apana.org.au>,
        <linux-crypto@...r.kernel.org>, <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next v2 10/14] octeontx2-pf: ipsec: Handle NPA
 threshold interrupt

Hi Simon,

On 2025-06-20 at 16:30:38, Simon Horman (horms@...nel.org) wrote:
> On Wed, Jun 18, 2025 at 05:00:04PM +0530, Tanmay Jagdale wrote:
> > The NPA Aura pool that is dedicated for 1st pass inline IPsec flows
> > raises an interrupt when the buffers of that aura_id drop below a
> > threshold value.
> > 
> > Add the following changes to handle this interrupt
> > - Increase the number of MSIX vectors requested for the PF/VF to
> >   include NPA vector.
> > - Create a workqueue (refill_npa_inline_ipsecq) to allocate and
> >   refill buffers to the pool.
> > - When the interrupt is raised, schedule the workqueue entry,
> >   cn10k_ipsec_npa_refill_inb_ipsecq(), where the current count of
> >   consumed buffers is determined via NPA_LF_AURA_OP_CNT and then
> >   replenished.
> > 
> > Signed-off-by: Tanmay Jagdale <tanmay@...vell.com>
> > ---
> > Changes in V2:
> > - Fixed sparse warnings
> > 
> > V1 Link: https://lore.kernel.org/netdev/20250502132005.611698-12-tanmay@marvell.com/
> > 
> >  .../marvell/octeontx2/nic/cn10k_ipsec.c       | 94 ++++++++++++++++++-
> >  .../marvell/octeontx2/nic/cn10k_ipsec.h       |  1 +
> >  .../ethernet/marvell/octeontx2/nic/otx2_pf.c  |  4 +
> >  .../ethernet/marvell/octeontx2/nic/otx2_reg.h |  2 +
> >  .../ethernet/marvell/octeontx2/nic/otx2_vf.c  |  4 +
> >  5 files changed, 104 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/cn10k_ipsec.c b/drivers/net/ethernet/marvell/octeontx2/nic/cn10k_ipsec.c
> 
> ...
> 
> >  static int cn10k_inb_cpt_init(struct net_device *netdev)
> >  {
> >  	struct otx2_nic *pfvf = netdev_priv(netdev);
> > -	int ret = 0;
> > +	int ret = 0, vec;
> > +	char *irq_name;
> > +	void *ptr;
> > +	u64 val;
> >  
> >  	ret = cn10k_ipsec_setup_nix_rx_hw_resources(pfvf);
> >  	if (ret) {
> > @@ -528,6 +587,34 @@ static int cn10k_inb_cpt_init(struct net_device *netdev)
> >  		return ret;
> >  	}
> >  
> > +	/* Work entry for refilling the NPA queue for ingress inline IPSec */
> > +	INIT_WORK(&pfvf->ipsec.refill_npa_inline_ipsecq,
> > +		  cn10k_ipsec_npa_refill_inb_ipsecq);
> > +
> > +	/* Register NPA interrupt */
> > +	vec = pfvf->hw.npa_msixoff;
> > +	irq_name = &pfvf->hw.irq_name[vec * NAME_SIZE];
> > +	snprintf(irq_name, NAME_SIZE, "%s-npa-qint", pfvf->netdev->name);
> > +
> > +	ret = request_irq(pci_irq_vector(pfvf->pdev, vec),
> > +			  cn10k_ipsec_npa_inb_ipsecq_intr_handler, 0,
> > +			  irq_name, pfvf);
> > +	if (ret) {
> > +		dev_err(pfvf->dev,
> > +			"RVUPF%d: IRQ registration failed for NPA QINT\n",
> > +			rvu_get_pf(pfvf->pdev, pfvf->pcifunc));
> > +		return ret;
> > +	}
> > +
> > +	/* Enable NPA threshold interrupt */
> > +	ptr = otx2_get_regaddr(pfvf, NPA_LF_AURA_OP_INT);
> 
> Hi Tanmay,
Hi Simon,

> 
> ptr is set but otherwise unused in this function.
> Probably it should be removed.
ACK. ptr is unused and I have removed it for the next version.

> 
> Flagged by clang and gcc with -Wunused-but-set-variable
> 
> Also, Sparse warns that the return type of otx2_get_regaddr()
> is  void __iomem *, but ptr does not have an __iomem annotation.
> 

With Regards,
Tanmay
> > +	val = BIT_ULL(43) | BIT_ULL(17);
> > +	otx2_write64(pfvf, NPA_LF_AURA_OP_INT,
> > +		     ((u64)pfvf->ipsec.inb_ipsec_pool << 44) | val);
> > +
> > +	/* Enable interrupt */
> > +	otx2_write64(pfvf, NPA_LF_QINTX_ENA_W1S(0), BIT_ULL(0));
> > +
> >  	return ret;
> >  }
> >