netdev - Re: [PATCH iwl-next v3 12/13] iavf: refactor add/del FDIR filters

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Message-ID: <20240724163016.GB97837@kernel.org>
Date: Wed, 24 Jul 2024 17:30:16 +0100
From: Simon Horman <horms@...nel.org>
To: Ahmed Zaki <ahmed.zaki@...el.com>
Cc: intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
	anthony.l.nguyen@...el.com,
	Sridhar Samudrala <sridhar.samudrala@...el.com>,
	Marcin Szycik <marcin.szycik@...ux.intel.com>
Subject: Re: [PATCH iwl-next v3 12/13] iavf: refactor add/del FDIR filters

On Wed, Jul 24, 2024 at 10:14:19AM -0600, Ahmed Zaki wrote:

...

> > > +/**
> > > + * iavf_fdir_del_fltr - delete a flow director filter from the list
> > > + * @adapter: pointer to the VF adapter structure
> > > + * @loc: location to delete.
> > > + *
> > > + * Return: 0 on success or negative errno on failure.
> > > + */
> > > +int iavf_fdir_del_fltr(struct iavf_adapter *adapter, u32 loc)
> > > +{
> > > +	struct iavf_fdir_fltr *fltr = NULL;
> > > +	int err = 0;
> > > +
> > > +	spin_lock_bh(&adapter->fdir_fltr_lock);
> > > +	fltr = iavf_find_fdir_fltr(adapter, loc);
> > > +
> > > +	if (fltr) {
> > > +		if (fltr->state == IAVF_FDIR_FLTR_ACTIVE) {
> > > +			fltr->state = IAVF_FDIR_FLTR_DEL_REQUEST;
> > > +		} else if (fltr->state == IAVF_FDIR_FLTR_INACTIVE) {
> > > +			list_del(&fltr->list);
> > > +			kfree(fltr);
> > > +			adapter->fdir_active_fltr--;
> > > +			fltr = NULL;
> > > +		} else {
> > > +			err = -EBUSY;
> > > +		}
> > > +	} else if (adapter->fdir_active_fltr) {
> > > +		err = -EINVAL;
> > > +	}
> > > +
> > > +	if (fltr && fltr->state == IAVF_FDIR_FLTR_DEL_REQUEST)
> > > +		iavf_schedule_aq_request(adapter, IAVF_FLAG_AQ_DEL_FDIR_FILTER);
> > 
> > It seems that prior to this change the condition and call to
> > iavf_schedule_aq_request were not protected by fdir_fltr_lock, and now they
> > are. If so, is this change intentional.
> > 
> 
> yes it is, fltr is member of the list that should be protected by the
> spinlock.

Thanks,

I would suggest moving this into a separate patch: changing locking is a
bit different to refactoring.

Or, if not, at least mentioning it in the patch description.