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From: David Marchand <david.marchand@redhat.com>
To: "Wang, Yinan" <yinan.wang@intel.com>
Cc: "dev@dpdk.org" <dev@dpdk.org>,
	"maxime.coquelin@redhat.com" <maxime.coquelin@redhat.com>,
	 "olivier.matz@6wind.com" <olivier.matz@6wind.com>,
	"fbl@sysclose.org" <fbl@sysclose.org>,
	 "i.maximets@ovn.org" <i.maximets@ovn.org>,
	"Xia, Chenbo" <chenbo.xia@intel.com>,
	"Stokes, Ian" <ian.stokes@intel.com>,
	"stable@dpdk.org" <stable@dpdk.org>,
	 Jijiang Liu <jijiang.liu@intel.com>,
	Yuanhan Liu <yuanhan.liu@linux.intel.com>
Subject: Re: [dpdk-dev] [PATCH v4 3/3] vhost: fix offload flags in Rx path
Date: Wed, 12 May 2021 17:20:21 +0200
Message-ID: <CAJFAV8zengeneG17vjHNA=Twtwp=zeZjF5=a_vUXtbv98PrwBQ@mail.gmail.com> (raw)
In-Reply-To: <BYAPR11MB2648F122110B5226E2994FAE8F529@BYAPR11MB2648.namprd11.prod.outlook.com>

On Wed, May 12, 2021 at 5:30 AM Wang, Yinan <yinan.wang@intel.com> wrote:
>
> Hi David,
>
> Since vhost tx offload can’t work now, we report a Bugzilla as below, could you help to take a look?
> https://bugs.dpdk.org/show_bug.cgi?id=702

(I discovered your mail from 05/08 only today, now that I got a new
mail, might be a pebcak from me, sorry...)


- Looking at the bz, there is a first issue/misconception.
testpmd only does TSO or any kind of tx offloading with the csum forward engine.
The iofwd engine won't make TSO possible.


- Let's say we use the csum fwd engine, testpmd configures drivers
through the ethdev API.
The ethdev API states that no offloading is enabled unless requested
by the application.
TSO, l3/l4 checksums offloading are documented as:
https://doc.dpdk.org/guides/nics/features.html#l3-checksum-offload
https://doc.dpdk.org/guides/nics/features.html#lro

But the vhost pmd does not report such capabilities.
https://git.dpdk.org/dpdk/tree/drivers/net/vhost/rte_eth_vhost.c#n1276

So we can't expect testpmd to have tso working with net/vhost pmd.


- The csum offloading engine swaps mac addresses.
I would expect issues with inter vm traffic.


In summary, I think this is a bad test.
If it worked with the commands in the bugzilla before my change (which
I doubt), it was wrong.


> We also tried vhost example with VM2VM iperf test, large pkts also can't forwarding.

"large pkts", can you give details?

I tried to use this example, without/with my change, but:

When I try to start this example with a physical port and two vhosts,
I get a crash (division by 0 on vdmq stuff).
When I start it without a physical port, I get a complaint about no
port being enabled.
Passing a portmask 0x1 seems to work, the example starts but, next, no
traffic is forwarded (not even arp).
Hooking gdb, I never get packet dequeued from vhost.


-- 
David Marchand


  reply	other threads:[~2021-05-12 15:20 UTC|newest]

Thread overview: 63+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-01  9:52 [dpdk-dev] [PATCH 0/5] Offload flags fixes David Marchand
2021-04-01  9:52 ` [dpdk-dev] [PATCH 1/5] mbuf: mark old offload flag as deprecated David Marchand
2021-04-07 20:14   ` Flavio Leitner
2021-04-08  7:23   ` Olivier Matz
2021-04-08  8:41     ` David Marchand
2021-04-01  9:52 ` [dpdk-dev] [PATCH 2/5] net/tap: do not touch Tx offload flags David Marchand
2021-04-07 20:15   ` Flavio Leitner
2021-04-08  7:41     ` Olivier Matz
2021-04-08 11:21       ` Flavio Leitner
2021-04-08 12:05         ` Olivier Matz
2021-04-08 12:58           ` Flavio Leitner
2021-04-09 13:30             ` Olivier Matz
2021-04-09 16:55               ` Flavio Leitner
2021-04-28 12:17               ` David Marchand
2021-04-08 12:16         ` Ananyev, Konstantin
2021-04-08  7:53   ` Olivier Matz
2021-04-28 12:12     ` David Marchand
2021-04-01  9:52 ` [dpdk-dev] [PATCH 3/5] net/virtio: " David Marchand
2021-04-13 14:17   ` Maxime Coquelin
2021-04-01  9:52 ` [dpdk-dev] [PATCH 4/5] net/virtio: refactor Tx offload helper David Marchand
2021-04-08 13:05   ` Flavio Leitner
2021-04-09  2:31   ` Ruifeng Wang
2021-04-01  9:52 ` [dpdk-dev] [PATCH 5/5] vhost: fix offload flags in Rx path David Marchand
2021-04-08  8:28   ` Olivier Matz
2021-04-08 18:38   ` Flavio Leitner
2021-04-13 15:27     ` Maxime Coquelin
2021-04-27 17:09       ` David Marchand
2021-04-27 17:19         ` David Marchand
2021-04-29  8:04 ` [dpdk-dev] [PATCH v2 0/4] Offload flags fixes David Marchand
2021-04-29  8:04   ` [dpdk-dev] [PATCH v2 1/4] mbuf: mark old offload flag as deprecated David Marchand
2021-04-29 12:14     ` Lance Richardson
2021-04-29 16:45     ` Ajit Khaparde
2021-04-29  8:04   ` [dpdk-dev] [PATCH v2 2/4] net/virtio: do not touch Tx offload flags David Marchand
2021-04-29 13:51     ` Flavio Leitner
2021-04-29  8:04   ` [dpdk-dev] [PATCH v2 3/4] net/virtio: refactor Tx offload helper David Marchand
2021-04-29 12:59     ` Maxime Coquelin
2021-04-29  8:04   ` [dpdk-dev] [PATCH v2 4/4] vhost: fix offload flags in Rx path David Marchand
2021-04-29 13:30     ` Maxime Coquelin
2021-04-29 13:31       ` Maxime Coquelin
2021-04-29 20:21         ` David Marchand
2021-04-30  8:38           ` Maxime Coquelin
2021-04-29 20:09       ` David Marchand
2021-04-29 18:39     ` Flavio Leitner
2021-04-29 19:18       ` David Marchand
2021-05-03 13:26 ` [dpdk-dev] [PATCH v3 0/4] Offload flags fixes David Marchand
2021-05-03 13:26   ` [dpdk-dev] [PATCH v3 1/4] mbuf: mark old offload flag as deprecated David Marchand
2021-05-03 14:02     ` Maxime Coquelin
2021-05-03 14:12     ` David Marchand
2021-05-03 13:26   ` [dpdk-dev] [PATCH v3 2/4] net/virtio: do not touch Tx offload flags David Marchand
2021-05-03 13:26   ` [dpdk-dev] [PATCH v3 3/4] net/virtio: refactor Tx offload helper David Marchand
2021-05-03 13:26   ` [dpdk-dev] [PATCH v3 4/4] vhost: fix offload flags in Rx path David Marchand
2021-05-03 15:24   ` [dpdk-dev] [PATCH v3 0/4] Offload flags fixes Maxime Coquelin
2021-05-03 16:21     ` David Marchand
2021-05-03 16:43 ` [dpdk-dev] [PATCH v4 0/3] " David Marchand
2021-05-03 16:43   ` [dpdk-dev] [PATCH v4 1/3] net/virtio: do not touch Tx offload flags David Marchand
2021-05-03 16:43   ` [dpdk-dev] [PATCH v4 2/3] net/virtio: refactor Tx offload helper David Marchand
2021-05-03 16:43   ` [dpdk-dev] [PATCH v4 3/3] vhost: fix offload flags in Rx path David Marchand
2021-05-04 11:07     ` Flavio Leitner
2021-05-08  6:24     ` Wang, Yinan
2021-05-12  3:29       ` Wang, Yinan
2021-05-12 15:20         ` David Marchand [this message]
2021-05-13  6:34           ` Wang, Yinan
2021-05-04  8:29   ` [dpdk-dev] [PATCH v4 0/3] Offload flags fixes Maxime Coquelin

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