From: Olivier Matz <olivier.matz@6wind.com>
To: Shahaf Shuler <shahafs@mellanox.com>
Cc: "Xueming(Steven) Li" <xuemingl@mellanox.com>,
Thomas Monjalon <thomas@monjalon.net>,
Jingjing Wu <jingjing.wu@intel.com>,
Yongseok Koh <yskoh@mellanox.com>, "dev@dpdk.org" <dev@dpdk.org>
Subject: Re: [dpdk-dev] [PATCH 4/6] ethdev: introduce TX common tunnel offloads
Date: Mon, 22 Jan 2018 13:46:38 +0100 [thread overview]
Message-ID: <20180122124638.pybfffk4iqjohouy@platinum> (raw)
In-Reply-To: <VI1PR05MB31493028BE46D455344D5449C3EA0@VI1PR05MB3149.eurprd05.prod.outlook.com>
Hi,
On Tue, Jan 16, 2018 at 07:06:15PM +0000, Shahaf Shuler wrote:
> Hi Oliver, Xueming,
>
> Tuesday, January 16, 2018 7:29 PM, Xueming(Steven) Li:
> > > Hi Xueming,
> > >
> > > On Tue, Jan 09, 2018 at 10:11:08PM +0800, Xueming Li wrote:
> > > > */
> > > > #define DEV_TX_OFFLOAD_SECURITY 0x00020000
> > > > +/**< Device supports arbitrary tunnel chksum and tso offloading w/o
> > > knowing
> > > > + * tunnel detail. Checksum and TSO are calculated based on mbuf
> > > fields:
> > > > + * l*_len, outer_l*_len
> > > > + * PKT_TX_OUTER_IPV6, PKT_TX_IPV6
> > > > + * PKT_TX_IP_CKSUM, PKT_TX_TCP_CKSUM, PKT_TX_UDP_CKSUM
> > > > + * When set application must guarantee correct header fields, no need
> > > to
> > > > + * specify tunnel type PKT_TX_TUNNEL_* for HW.
> > > > + */
>
> I think some documentation is missing here.
> What the NIC needs to know to support the generic tunnel TSO and checksum offloads is:
> 1. the length of each header
> 2. the type of the outer/inner l3/l4. Meaning is it IPv4/IPv6 and whether it is UDP/TCP.
>
> The outer IPv6 seems covered. The inner L4 seems missing.
>
> More details about this offload below.
>
> > > > +#define DEV_TX_OFFLOAD_GENERIC_TNL_CKSUM_TSO 0x00040000
> > > >
> > > > struct rte_pci_device;
> > > >
> > >
> > > I'd like to have more details about this flag and its meaning.
> > >
> > > Let's say we want to do TSO on the following vxlan packet:
> > > Ether / IP1 / UDP / VXLAN / Ether / IP2 / TCP / Data
> > >
> > > With the current API, we need to pass the tunnel type to the hardware
> > > with the flag PKT_TX_TUNNEL_VXLAN. Thanks to that, the driver can
> > > forward this information to the hardware so it knows that the
> > > ip1->length, udp->length and optionally the udp->chksum have to be
> > > updated for each generated segment.
> > >
> > > With your proposal, if I understand properly, it is not expected to
> > > pass the tunnel type in the mbuf. So how can the hardware know if some
> > > fields have to be updated in the outer header?
> >
> > I'm not expert on hardware, the driver has to supply outer and inner
> > L3/L4 offsets, types and which field(s) to fill checksum, no length update as
> > far as I know.
>
> Mellanox HW is capable to parse the packet according to hints from the driver.
>
> If you think about it, to calculate the IP checksum all you need to do is know the inner/outer IP offset, and the fact it is an IPv4.
> To calculate the inner TCP/UDP checksum it is the same. all that after the L4 is counted as payload and the pseudo header can be done with the information about the IP.
>
> About TSO - just need to get the offset till the inner header so that the NIC can append the full headers to every segment and update the inner/outer L3 and L4 fields accordingly (which their location is known).
I think that's partially true. Let me try to clarify:
- in case of VXLAN (my previous example), the hw needs to update the
outer L3 (ip length) and L4 (udp length and optionnally checksum)
- in case of GRE, an update of the checksum is required if present. The
sequence number may also be increased (I don't know how widely it is
used).
- in case of a proprietary or unsupported tunnel, the hardware cannot
know which fields to update in the outer header. So I'm not sure
a "generic" flag is possible.
How can the application know which tunnels types are supported by the
hardware and which should be done in software?
Olivier
next prev parent reply other threads:[~2018-01-22 12:46 UTC|newest]
Thread overview: 80+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-09 14:11 [dpdk-dev] [PATCH 0/6] Support generic tunnel TX csum and TSO Xueming Li
2018-01-09 14:11 ` [dpdk-dev] [PATCH 1/6] net/mlx5: support tx swp tunnel offloading Xueming Li
2018-01-29 15:08 ` [dpdk-dev] [PATCH v2 1/5] ethdev: introduce Tx generic tunnel offloads Xueming Li
2018-01-29 16:49 ` Ananyev, Konstantin
2018-01-30 3:01 ` Xueming(Steven) Li
2018-01-30 13:28 ` Ananyev, Konstantin
2018-01-30 15:27 ` Xueming(Steven) Li
2018-01-30 15:33 ` Ananyev, Konstantin
2018-01-30 15:47 ` Xueming(Steven) Li
2018-01-30 16:02 ` Ananyev, Konstantin
2018-01-30 16:10 ` Xueming(Steven) Li
2018-01-30 17:04 ` Ananyev, Konstantin
2018-01-30 17:54 ` Xueming(Steven) Li
2018-01-30 20:21 ` Thomas Monjalon
2018-01-31 15:20 ` Xueming(Steven) Li
2018-01-31 15:17 ` Xueming(Steven) Li
2018-01-29 15:08 ` [dpdk-dev] [PATCH v2 2/5] app/testpmd: testpmd support " Xueming Li
2018-01-29 15:08 ` [dpdk-dev] [PATCH v2 3/5] net/mlx5: separate TSO function in Tx data path Xueming Li
2018-01-29 15:08 ` [dpdk-dev] [PATCH v2 4/5] net/mlx5: support generic tunnel offloading Xueming Li
2018-01-29 15:08 ` [dpdk-dev] [PATCH v2 5/5] net/mlx5: allow max 192B TSO inline header length Xueming Li
2018-03-05 14:51 ` [dpdk-dev] [PATCH v3 0/7] support generic tunnel Tx checksum and TSO Xueming Li
2018-03-05 14:51 ` [dpdk-dev] [PATCH v3 1/7] ethdev: introduce Tx generic tunnel L3/L4 offload Xueming Li
2018-03-21 1:40 ` Yongseok Koh
2018-03-22 13:55 ` Xueming(Steven) Li
2018-03-28 12:52 ` Olivier Matz
2018-04-04 8:20 ` Xueming(Steven) Li
2018-03-05 14:51 ` [dpdk-dev] [PATCH v3 2/7] app/testpmd: testpmd support Tx generic tunnel offloads Xueming Li
2018-03-05 14:51 ` [dpdk-dev] [PATCH v3 3/7] app/testpmd: add more GRE extension to csum engine Xueming Li
2018-03-05 14:51 ` [dpdk-dev] [PATCH v3 4/7] app/testpmd: introduce VXLAN GPE to csum forwarding engine Xueming Li
2018-03-05 14:51 ` [dpdk-dev] [PATCH v3 5/7] net/mlx5: separate TSO function in Tx data path Xueming Li
2018-03-05 14:51 ` [dpdk-dev] [PATCH v3 6/7] net/mlx5: support generic tunnel offloading Xueming Li
2018-03-05 14:51 ` [dpdk-dev] [PATCH v3 7/7] net/mlx5: allow max 192B TSO inline header length Xueming Li
2018-04-08 12:32 ` [dpdk-dev] [PATCH v4 0/4] support Tx generic tunnel checksum and TSO Xueming Li
2018-04-17 14:43 ` [dpdk-dev] [PATCH v5 0/2] " Xueming Li
2018-04-17 14:47 ` [dpdk-dev] [PATCH v5 1/2] ethdev: introduce generic IP/UDP " Xueming Li
2018-04-17 21:21 ` Thomas Monjalon
2018-04-17 14:49 ` [dpdk-dev] [PATCH v5 2/2] app/testpmd: testpmd support Tx generic tunnel offloads Xueming Li
2018-04-18 13:38 ` [dpdk-dev] [PATCH v6 0/2] support Tx generic tunnel checksum and TSO Xueming Li
2018-04-18 13:58 ` [dpdk-dev] [PATCH v6 1/2] ethdev: introduce generic IP/UDP " Xueming Li
2018-04-18 14:28 ` Thomas Monjalon
2018-04-18 16:45 ` Ananyev, Konstantin
2018-04-18 18:02 ` Thomas Monjalon
2018-04-23 9:55 ` Olivier Matz
2018-04-20 12:48 ` [dpdk-dev] [PATCH v7 0/2] support Tx generic " Xueming Li
2018-04-23 11:36 ` [dpdk-dev] [PATCH v8 " Xueming Li
2018-04-23 16:17 ` Ferruh Yigit
2018-04-23 11:36 ` [dpdk-dev] [PATCH v8 1/2] ethdev: introduce generic IP/UDP " Xueming Li
2018-04-23 11:49 ` Xueming Li
2018-04-23 11:36 ` [dpdk-dev] [PATCH v8 2/2] app/testpmd: testpmd support Tx generic tunnel offloads Xueming Li
2018-04-20 12:48 ` [dpdk-dev] [PATCH v7 1/2] ethdev: introduce generic IP/UDP tunnel checksum and TSO Xueming Li
2018-04-23 9:59 ` Olivier Matz
2018-04-20 12:48 ` [dpdk-dev] [PATCH v7 2/2] app/testpmd: testpmd support Tx generic tunnel offloads Xueming Li
2018-04-18 13:59 ` [dpdk-dev] [PATCH v6 " Xueming Li
2018-04-08 12:32 ` [dpdk-dev] [PATCH v4 1/4] ethdev: introduce generic IP/UDP tunnel checksum and TSO Xueming Li
2018-04-16 22:42 ` Thomas Monjalon
2018-04-17 7:53 ` Xueming(Steven) Li
2018-04-17 8:10 ` Thomas Monjalon
2018-04-08 12:32 ` [dpdk-dev] [PATCH v4 2/4] app/testpmd: testpmd support Tx generic tunnel offloads Xueming Li
2018-04-17 14:24 ` Iremonger, Bernard
2018-04-17 15:44 ` Xueming(Steven) Li
2018-04-08 12:32 ` [dpdk-dev] [PATCH v4 3/4] app/testpmd: add more GRE extension to csum engine Xueming Li
2018-04-16 22:45 ` Thomas Monjalon
2018-04-17 5:19 ` Xueming(Steven) Li
2018-04-08 12:32 ` [dpdk-dev] [PATCH v4 4/4] app/testpmd: introduce VXLAN GPE to csum forwarding engine Xueming Li
2018-04-16 22:46 ` Thomas Monjalon
2018-04-17 13:56 ` Iremonger, Bernard
2018-04-17 14:12 ` Xueming(Steven) Li
2018-01-09 14:11 ` [dpdk-dev] [PATCH 2/6] net/mlx5: allow max 192B WQE TSO inline header length Xueming Li
2018-01-09 14:11 ` [dpdk-dev] [PATCH 3/6] net/mlx5: add SWP PCI parameter for TX common tunnel offloads Xueming Li
2018-01-09 14:11 ` [dpdk-dev] [PATCH 4/6] ethdev: introduce " Xueming Li
2018-01-11 18:38 ` Ferruh Yigit
2018-01-16 17:10 ` Olivier Matz
2018-01-16 17:28 ` Xueming(Steven) Li
2018-01-16 19:06 ` Shahaf Shuler
2018-01-22 12:46 ` Olivier Matz [this message]
2018-01-22 20:06 ` Shahaf Shuler
2018-01-17 0:50 ` Yongseok Koh
2018-01-09 14:11 ` [dpdk-dev] [PATCH 5/6] net/mlx5: support " Xueming Li
2018-01-09 14:11 ` [dpdk-dev] [PATCH 6/6] app/testpmd: testpmd " Xueming Li
2018-01-16 3:09 ` Lu, Wenzhuo
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