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From: "Ananyev, Konstantin" <konstantin.ananyev@intel.com>
To: Flavio Leitner <fbl@sysclose.org>, Olivier Matz <olivier.matz@6wind.com>
Cc: David Marchand <david.marchand@redhat.com>,
	"dev@dpdk.org" <dev@dpdk.org>,
	 "maxime.coquelin@redhat.com" <maxime.coquelin@redhat.com>,
	"i.maximets@ovn.org" <i.maximets@ovn.org>,
	"Wiles, Keith" <keith.wiles@intel.com>
Subject: Re: [dpdk-dev] [PATCH 2/5] net/tap: do not touch Tx offload flags
Date: Thu, 8 Apr 2021 12:16:24 +0000
Message-ID: <DM6PR11MB449120D44289657A7A138F4A9A749@DM6PR11MB4491.namprd11.prod.outlook.com> (raw)
In-Reply-To: <YG7nVtJ+Ecxf8MNN@p50.lan>



> 
> On Thu, Apr 08, 2021 at 09:41:59AM +0200, Olivier Matz wrote:
> > On Wed, Apr 07, 2021 at 05:15:39PM -0300, Flavio Leitner wrote:
> > > On Thu, Apr 01, 2021 at 11:52:40AM +0200, David Marchand wrote:
> > > > Tx offload flags are of the application responsibility.
> > > > Leave the mbuf alone and check for TSO where needed.
> > > >
> > > > Signed-off-by: David Marchand <david.marchand@redhat.com>
> > > > ---
> > >
> > > The patch looks good, but maybe a better approach would be
> > > to change the documentation to require the TCP_CKSUM flag
> > > when TCP_SEG is used, otherwise this flag adjusting needs
> > > to be replicated every time TCP_SEG is used.
> > >
> > > The above could break existing applications, so perhaps doing
> > > something like below would be better and backwards compatible?
> > > Then we can remove those places tweaking the flags completely.
> >
> > As a first step, I suggest to document that:
> > - applications must set TCP_CKSUM when setting TCP_SEG
> 
> That's what I suggest above.
> 
> > - pmds must suppose that TCP_CKSUM is set when TCP_SEG is set
> 
> But that keeps the problem of implying the TCP_CKSUM flag in
> various places.
> 
> > This is clearer that what we have today, and I think it does not break
> > anything. This will guide apps in the correct direction, facilitating
> > an eventual future PMD change.
> >
> > > diff --git a/lib/librte_mbuf/rte_mbuf_core.h b/lib/librte_mbuf/rte_mbuf_core.h
> > > index c17dc95c5..6a0c2cdd9 100644
> > > --- a/lib/librte_mbuf/rte_mbuf_core.h
> > > +++ b/lib/librte_mbuf/rte_mbuf_core.h
> > > @@ -298,7 +298,7 @@ extern "C" {
> > >   *  - if it's IPv4, set the PKT_TX_IP_CKSUM flag
> > >   *  - fill the mbuf offload information: l2_len, l3_len, l4_len, tso_segsz
> > >   */
> > > -#define PKT_TX_TCP_SEG       (1ULL << 50)
> > > +#define PKT_TX_TCP_SEG       (1ULL << 50) | PKT_TX_TCP_CKSUM

I think that would be an ABI breakage.

> > >
> > >  /** TX IEEE1588 packet to timestamp. */
> > >  #define PKT_TX_IEEE1588_TMST (1ULL << 51)
> >
> > I'm afraid some applications or drivers use extended bit manipulations
> > to do the conversion from/to another domain (like hardware descriptors
> > or application-specific flags). They may expect this constant to be a
> > uniq flag.
> 
> Interesting, do you have an example? Because each flag still has an
> separate meaning.


 

  parent reply	other threads:[~2021-04-08 12:16 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 [this message]
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
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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