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From: Simon Horman <simon.horman@netronome.com>
To: Jakub Kicinski <jakub.kicinski@netronome.com>
Cc: David Miller <davem@davemloft.net>,
	netdev@vger.kernel.org, oss-drivers@netronome.com,
	Pieter Jansen van Vuuren <pieter.jansenvanvuuren@netronome.com>
Subject: Re: [oss-drivers] Re: [PATCH net-next v2 7/9] nfp: add metadata to each flow offload
Date: Thu, 29 Jun 2017 13:22:14 +0200	[thread overview]
Message-ID: <20170629112213.GB24136@vergenet.net> (raw)
In-Reply-To: <20170629014250.3000597f@cakuba.netronome.com>

On Thu, Jun 29, 2017 at 01:42:50AM -0700, Jakub Kicinski wrote:
> On Thu, 29 Jun 2017 10:14:29 +0200, Simon Horman wrote:
> > > > +	/* Checking if buffer is empty. */
> > > > +	if (ring->head == ring->tail) {
> > > > +		*mask_id = freed_id;
> > > > +		return -ENOENT;
> > > > +	}
> > > > +
> > > > +	memcpy(&temp_id, &ring->buf[ring->tail], NFP_FLOWER_MASK_ELEMENT_RS);
> > > > +	*mask_id = temp_id;
> > > > +	memcpy(&ring->buf[ring->tail], &freed_id, NFP_FLOWER_MASK_ELEMENT_RS);
> > > > +	ring->tail = (ring->tail + NFP_FLOWER_MASK_ELEMENT_RS) %
> > > > +		     (NFP_FLOWER_MASK_ENTRY_RS * NFP_FLOWER_MASK_ELEMENT_RS);
> > > > +
> > > > +	getnstimeofday64(&now);
> > > > +	delta = timespec64_sub(now, priv->mask_ids.last_used[*mask_id]);
> > > > +
> > > > +	if (timespec64_to_ns(&delta) < NFP_FL_MASK_REUSE_TIME_NS) {
> > > > +		nfp_release_mask_id(app, *mask_id);  
> > > 
> > > nfp_release_mask_id() will reset the time stamp and put the mask at the
> > > end of the queue.  Is that OK?  
> > 
> > I discussed this with Pieter. He believes that it is ok as it would be too
> > early to use the entry and its better put it to the back of the list and
> > skip to the next one.
> 
> But we shouldn't update the "last use" time if the grace period haven't
> elapsed otherwise we can live lock (I know, unlikely).  Could we simply
> move the time check right after the:
> 
> 	*mask_id = temp_id;
> 
> line?  I.e. move the check before we actually pick the mask off the
> queue?

Thanks, we now have a solution along those lines working.

  reply	other threads:[~2017-06-29 11:22 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-06-28 20:29 [PATCH net-next v2 0/9] introduce flower offload capabilities Simon Horman
2017-06-28 20:29 ` [PATCH net-next v2 1/9] net: switchdev: add SET_SWITCHDEV_OPS helper Simon Horman
2017-06-28 20:29 ` [PATCH net-next v2 2/9] nfp: add phys_switch_id support Simon Horman
2017-06-28 20:29 ` [PATCH net-next v2 3/9] nfp: provide infrastructure for offloading flower based TC filters Simon Horman
2017-06-29  1:35   ` Jakub Kicinski
2017-06-29  5:41     ` Simon Horman
2017-06-29  1:53   ` Jakub Kicinski
2017-06-29  8:16     ` Simon Horman
2017-06-29 13:56   ` Or Gerlitz
2017-06-29 14:31     ` Simon Horman
2017-06-28 20:29 ` [PATCH net-next v2 4/9] nfp: extend flower add flow offload Simon Horman
2017-06-29  6:18   ` Yunsheng Lin
2017-06-29  6:48     ` Jakub Kicinski
2017-06-29 13:47       ` David Laight
2017-06-28 20:29 ` [PATCH net-next v2 5/9] nfp: extend flower matching capabilities Simon Horman
2017-06-29 14:31   ` Or Gerlitz
2017-06-29 15:01     ` Simon Horman
2017-06-29 14:33   ` Or Gerlitz
2017-06-29 15:00     ` Simon Horman
2017-06-28 20:29 ` [PATCH net-next v2 6/9] nfp: add basic action capabilities to flower offloads Simon Horman
2017-06-28 20:30 ` [PATCH net-next v2 7/9] nfp: add metadata to each flow offload Simon Horman
2017-06-29  2:33   ` Jakub Kicinski
2017-06-29  8:14     ` [oss-drivers] " Simon Horman
2017-06-29  8:42       ` Jakub Kicinski
2017-06-29 11:22         ` Simon Horman [this message]
2017-06-28 20:30 ` [PATCH net-next v2 8/9] nfp: add a stats handler for flower offloads Simon Horman
2017-06-29  1:28   ` Jakub Kicinski
2017-06-29  8:14     ` [oss-drivers] " Simon Horman
2017-06-29  2:55   ` Jakub Kicinski
2017-06-29  8:15     ` [oss-drivers] " Simon Horman
2017-06-29 14:39   ` Or Gerlitz
2017-06-29 14:53     ` Simon Horman
2017-06-29 15:16   ` Or Gerlitz
2017-06-29 15:27     ` Simon Horman
2017-06-28 20:30 ` [PATCH net-next v2 9/9] nfp: add control message passing capabilities to " Simon Horman
2017-06-29 13:46   ` Or Gerlitz
2017-06-29 14:45     ` David Laight
2017-06-29 15:21   ` Or Gerlitz
2017-06-29 15:30     ` Simon Horman
2017-06-29 15:59       ` Or Gerlitz
2017-06-29 17:35         ` Simon Horman

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