patches for DPDK stable branches
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From: Tiwei Bie <tiwei.bie@intel.com>
To: Olivier MATZ <olivier.matz@6wind.com>
Cc: maxime.coquelin@redhat.com, yliu@fridaylinux.org,
	stephen@networkplumber.org, dev@dpdk.org, stable@dpdk.org,
	antonio.fischetti@intel.com
Subject: Re: [dpdk-stable] [dpdk-dev] [PATCH v2 06/10] net/virtio: fix queue setup consistency
Date: Fri, 8 Dec 2017 10:17:44 +0800	[thread overview]
Message-ID: <20171208021744.7hoobdsao5xx4b2q@debian-xvivbkq> (raw)
In-Reply-To: <20171207141443.msbs6oqmwjav2lpk@glumotte.dev.6wind.com>

Hi Olivier,

On Thu, Dec 07, 2017 at 03:14:44PM +0100, Olivier MATZ wrote:
> On Wed, Dec 06, 2017 at 01:25:29PM +0800, Tiwei Bie wrote:
> > Hi Maxime and Olivier:
> > 
> > On Thu, Sep 07, 2017 at 02:13:43PM +0200, Olivier Matz wrote:
> > [...]
> > > diff --git a/drivers/net/virtio/virtio_ethdev.c b/drivers/net/virtio/virtio_ethdev.c
> > > index 8eee3ff80..c7888f103 100644
> > > --- a/drivers/net/virtio/virtio_ethdev.c
> > > +++ b/drivers/net/virtio/virtio_ethdev.c
> > > @@ -1737,6 +1737,19 @@ virtio_dev_start(struct rte_eth_dev *dev)
> > >  	struct virtnet_rx *rxvq;
> > >  	struct virtnet_tx *txvq __rte_unused;
> > >  	struct virtio_hw *hw = dev->data->dev_private;
> > > +	int ret;
> > > +
> > > +	/* Finish the initialization of the queues */
> > > +	for (i = 0; i < dev->data->nb_rx_queues; i++) {
> > > +		ret = virtio_dev_rx_queue_setup_finish(dev, i);
> > > +		if (ret < 0)
> > > +			return ret;
> > > +	}
> > 
> > I'm trying to fix an issue [1] reported by Antonio. And during
> > the debugging, I found that vector Rx of virtio PMD has been
> > broken (when doing port stop/start) since below two patches were
> > applied:
> > 
> > 25bf7a0b0936 ("vhost: make error handling consistent in Rx path")
> >    -- needed on the Tx side (testpmd/vhost-pmd in below test)
> > efc83a1e7fc3 ("net/virtio: fix queue setup consistency")
> >    -- needed on the Rx side (testpmd/virtio-user in below test)
> 
> Just to be sure I understand properly: each of these 2 patches
> break a different part your test case?
> 

Thank you for looking into this! ;-)

I mean the above test case won't pass when we have both
of them applied. And the first patch changes the Tx side,
and the second one changes the Rx side.

I haven't done thorough analysis on the first patch, so
I'm not sure what would be affected in the non-mergeable
Rx and vector Rx of virtio-PMD after changing the error
handling in vhost.

But I think there is something wrong with this patch (i.e.
the second patch). From my understanding, it seems that
virtio_rxq_rearm_vec() has an assumption that each time
it's called, the starting 'desc_idx' should be multiple
times of RTE_VIRTIO_VPMD_RX_REARM_THRESH (or 0). After
introducing virtio_dev_rx_queue_setup_finish() in device
start, the rxq will be fully refilled no matter where
the 'desc_idx' is after a device stop/start. And it could
break such assumption.

> I tried to reproduce your test case (the working case first):
> - on 0c4f909c17 (the commit before the efc83a1e7fc3)
> - without the patch disabling mergeable Rx
> 
> No packet is received. Am I doing something wrong? Please see the
> log:
> 
>    cd /root/dpdk.org
>    git checkout -b test 0c4f909c17
>    rm -rf build && make config T=x86_64-native-linuxapp-gcc && make -j32
>    insmod build/kmod/igb_uio.ko
>    echo 1000 > /sys/devices/system/node/node0/hugepages/hugepages-2048kB/nr_hugepages
>    echo 1000 > /sys/devices/system/node/node1/hugepages/hugepages-2048kB/nr_hugepages

Sorry, I forgot to mention that, 1G hugepage is required
to use virtio-user (2M hugepage won't work). For more
details about it, you could refer to the "Limitations"
section in below doc:

http://dpdk.org/doc/guides/howto/virtio_user_for_container_networking.html#limitations

Best regards,
Tiwei Bie

  reply	other threads:[~2017-12-08  2:18 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20170831134015.1383-1-olivier.matz@6wind.com>
2017-08-31 13:40 ` [dpdk-stable] [PATCH 1/9] net/virtio: revert "do not claim to support LRO" Olivier Matz
2017-08-31 13:40 ` [dpdk-stable] [PATCH 2/9] net/virtio: revert "do not falsely claim to do IP checksum" Olivier Matz
2017-08-31 13:47   ` [dpdk-stable] [dpdk-dev] " Olivier MATZ
2017-08-31 13:40 ` [dpdk-stable] [PATCH 3/9] doc: fix description of L4 Rx checksum offload Olivier Matz
2017-08-31 13:40 ` [dpdk-stable] [PATCH 4/9] net/virtio: fix log levels in configure Olivier Matz
2017-08-31 13:40 ` [dpdk-stable] [PATCH 5/9] net/virtio: fix mbuf port for simple Rx function Olivier Matz
2017-08-31 13:48   ` [dpdk-stable] [dpdk-dev] " Olivier MATZ
2017-08-31 13:40 ` [dpdk-stable] [PATCH 6/9] net/virtio: fix queue setup consistency Olivier Matz
2017-08-31 13:49   ` [dpdk-stable] [dpdk-dev] " Olivier MATZ
2017-08-31 13:40 ` [dpdk-stable] [PATCH 7/9] net/virtio: rationalize setting of Rx/Tx handlers Olivier Matz
2017-09-01  9:19   ` Yuanhan Liu
2017-09-01  9:52     ` Olivier MATZ
2017-09-01 12:31       ` Yuanhan Liu
2017-09-06 14:40         ` Olivier MATZ
2017-09-07  8:13           ` Yuanhan Liu
2017-08-31 13:40 ` [dpdk-stable] [PATCH 8/9] net/virtio: keep Rx handler whatever the Tx queue config Olivier Matz
2017-08-31 13:50   ` [dpdk-stable] [dpdk-dev] " Olivier MATZ
2017-09-01  9:25   ` [dpdk-stable] " Yuanhan Liu
2017-09-01  9:58     ` Olivier MATZ
2017-09-01 12:22       ` Yuanhan Liu
2017-08-31 13:40 ` [dpdk-stable] [PATCH 9/9] net/virtio: fix Rx handler when checksum is requested Olivier Matz
2017-08-31 13:51   ` [dpdk-stable] [dpdk-dev] " Olivier MATZ
     [not found] ` <20170907121347.16208-1-olivier.matz@6wind.com>
2017-09-07 12:13   ` [dpdk-stable] [PATCH v2 01/10] net/virtio: revert "do not claim to support LRO" Olivier Matz
2017-09-07 12:13   ` [dpdk-stable] [PATCH v2 02/10] net/virtio: revert "do not falsely claim to do IP checksum" Olivier Matz
2017-09-07 12:13   ` [dpdk-stable] [PATCH v2 03/10] doc: fix description of L4 Rx checksum offload Olivier Matz
2017-09-07 12:13   ` [dpdk-stable] [PATCH v2 04/10] net/virtio: fix log levels in configure Olivier Matz
2017-09-07 12:13   ` [dpdk-stable] [PATCH v2 05/10] net/virtio: fix mbuf port for simple Rx function Olivier Matz
2017-09-07 12:13   ` [dpdk-stable] [PATCH v2 06/10] net/virtio: fix queue setup consistency Olivier Matz
2017-12-06  5:25     ` [dpdk-stable] [dpdk-dev] " Tiwei Bie
2017-12-07 14:14       ` Olivier MATZ
2017-12-08  2:17         ` Tiwei Bie [this message]
2018-02-01  3:14     ` Yao, Lei A
2018-02-01  8:27       ` Olivier Matz
2018-02-07  8:31         ` Xu, Qian Q
2018-02-07 22:01           ` Olivier Matz
2018-02-09  5:44             ` Wang, Zhihong
2018-02-09  8:59               ` Maxime Coquelin
2018-02-09  9:40                 ` Maxime Coquelin

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