From: "Xueming(Steven) Li" <xuemingl@mellanox.com>
To: Yongseok Koh <yskoh@mellanox.com>
Cc: Wenzhuo Lu <wenzhuo.lu@intel.com>,
Jingjing Wu <jingjing.wu@intel.com>,
Thomas Monjalon <thomas@monjalon.net>,
Olivier MATZ <olivier.matz@6wind.com>,
Shahaf Shuler <shahafs@mellanox.com>,
Ferruh Yigit <ferruh.yigit@intel.com>,
"dev@dpdk.org" <dev@dpdk.org>
Subject: Re: [dpdk-dev] [PATCH v3 1/7] ethdev: introduce Tx generic tunnel L3/L4 offload
Date: Thu, 22 Mar 2018 13:55:05 +0000 [thread overview]
Message-ID: <VI1PR05MB1678315ECD5E9B85FD936670ACA90@VI1PR05MB1678.eurprd05.prod.outlook.com> (raw)
In-Reply-To: <20180321014046.GA49883@yongseok-MBP.local>
> -----Original Message-----
> From: Yongseok Koh
> Sent: Wednesday, March 21, 2018 9:41 AM
> To: Xueming(Steven) Li <xuemingl@mellanox.com>
> Cc: Wenzhuo Lu <wenzhuo.lu@intel.com>; Jingjing Wu <jingjing.wu@intel.com>;
> Thomas Monjalon <thomas@monjalon.net>; Olivier MATZ
> <olivier.matz@6wind.com>; Shahaf Shuler <shahafs@mellanox.com>; Ferruh
> Yigit <ferruh.yigit@intel.com>; dev@dpdk.org
> Subject: Re: [PATCH v3 1/7] ethdev: introduce Tx generic tunnel L3/L4
> offload
>
> On Mon, Mar 05, 2018 at 10:51:15PM +0800, Xueming Li wrote:
> > This patch introduce new TX offload flags for device that supports
> > tunnel agnostic L3/L4 checksum and TSO offload.
> >
> > The support from the device is for inner and outer checksums on
> > IPV4/TCP/UDP and TSO for *any packet with the following format*:
> >
> > < some headers > / [optional IPv4/IPv6] / [optional TCP/UDP] / <some
> > headers> / [optional inner IPv4/IPv6] / [optional TCP/UDP]
> >
> > For example the following packets can use this feature:
> >
> > 1. eth / ipv4 / udp / VXLAN / ip / tcp 2. eth / ipv4 / GRE / MPLS /
> > ipv4 / udp
> >
> > Signed-off-by: Xueming Li <xuemingl@mellanox.com>
> > ---
> > lib/librte_ether/rte_ethdev.h | 24 ++++++++++++++++++++++++
> > lib/librte_mbuf/rte_mbuf.c | 5 +++++
> > lib/librte_mbuf/rte_mbuf.h | 18 ++++++++++++++++--
> > 3 files changed, 45 insertions(+), 2 deletions(-)
> >
> > diff --git a/lib/librte_ether/rte_ethdev.h
> > b/lib/librte_ether/rte_ethdev.h index 036153306..66d12d3e0 100644
> > --- a/lib/librte_ether/rte_ethdev.h
> > +++ b/lib/librte_ether/rte_ethdev.h
> > @@ -980,6 +980,30 @@ struct rte_eth_conf {
> > * the same mempool and has refcnt = 1.
> > */
> > #define DEV_TX_OFFLOAD_SECURITY 0x00020000
> > +/**< Generic tunnel L3/L4 checksum offload. To enable this offload
> > +feature
> > + * for a packet to be transmitted on hardware supporting generic
> > +tunnel L3/L4
> > + * checksum offload:
> > + * - fill outer_l2_len and outer_l3_len in mbuf
> > + * - fill l2_len and l3_len in mbuf
> > + * - set the flags PKT_TX_TUNNEL_xxx (use PKT_TX_TUNNEL_UNKNOWN if
> > +undefined)
> > + * - set the flags PKT_TX_OUTER_IP_CKSUM
> > + * - set the flags PKT_TX_IP_CKSUM
> > + * - set the flags PKT_TX_TCP_CKSUM, PKT_TX_SCTP_CKSUM or
> > +PKT_TX_UDP_CKSUM */
> > +#define DEV_TX_OFFLOAD_GENERIC_TNL_CKSUM 0x00040000
>
> It looks redundant to me. Isn't it same as having DEV_TX_OFFLOAD_*_CKSUM?
> According to the API document, when PKT_TX_*_CKSUM is set, all the
> necessary length fields should be filled in (e.g. mbuf->outer_l?_len and
> mbuf->l?_len). It doesn't need to specify any tunnel type for checksum.
> For example, in order to request checksum offload for an unknown tunnel
> type which is similar to VxLAN, what should app do? Even without defining
> this new offload flag, it is currently possible by setting
> (PKT_TX_OUTER_IP_CKSUM | PKT_TX_OUTER_IPV4 | PKT_TX_IP_CKSUM |
> PKT_TX_IPV4 | PKT_TX_UDP_CKSUM)
> along with various length fields.
Agree it almost same as existing checksum offloading requirement, besides:
1. it does not demand pseudo checksum
2. no need to clear IP checksum
I guess the requirement on API doc is a super set and differences could be
documented on PMD doc.
For mlx5 original chksum offloading, hw will parse everything w/o demanding
mbuf headers, a little better performance than SWP. The question is how to
choose between SWP and HW checksum offloading - assuming PKT_TX_TUNNEL_UNKNOWN
is the key. Take L3 VXLAN(no inner L2 header) as example, only SWP could
offload it correctly and PKT_TX_TUNNEL_UNKOWN should be used here, not
PKT_TX_TUNNEL_VXLAN, make sense?
Another question, how does user app know the NIC capability of generic tunnel
checksum offload?
>
> > +/**< Generic tunnel segmentation offload. To enable it, the user needs
> to:
> > + * - fill outer_l2_len and outer_l3_len in mbuf
> > + * - fill l2_len and l3_len in mbuf
> > + * - set the flags PKT_TX_TUNNEL_xxx (use PKT_TX_TUNNEL_UNKNOWN if
> > +undefined)
> > + * - set the flags PKT_TX_OUTER_IPV4 or PKT_TX_OUTER_IPV6
> > + * - if it's UDP tunnel, set the flags PKT_TX_OUTER_UDP
> > + * - set the flags PKT_TX_IPV4 or PKT_TX_IPV6
> > + * - set the PKT_TX_TCP_SEG flag in mbuf->ol_flags (this flag implies
> > + * PKT_TX_OUTER_IP_CKSUM, PKT_TX_IP_CKSUM and PKT_TX_TCP_CKSUM)
> > + * Hardware that supports generic tunnel TSO offload only update
> > +outer/inner
> > + * L3/L4 fields, tunnel fields are not touched.
> > + */
> > +#define DEV_TX_OFFLOAD_GENERIC_TNL_TSO 0x00080000
>
> Practically, for the existing TSO offloads for tunneled packets, tunnel
> type
> (PKT_TX_TUNNEL_*) is needed for knowing if transport is UDP-based or IP-
> based because the length field of UDP header should be updated for TSO.
> AFAIK, there's no TCP-based tunnel. For PKT_TX_TUNNEL_UNKNOWN, the only
> thing _unknown_ seems to be the type of transport and by defining
> PKT_TX_OUTER_UDP, you seem to recognize the type of transport between UDP
> and IP (it's not non-UDP). Given that, the new flags still look redundant
> and ambiguous. If PKT_TX_TUNNEL_VXLAN is set, there's no need to set
> PKT_TX_OUTER_UDP redundantly.
>
> Instead, I think defining PKT_TX_TUNNEL_UDP_UNKNOWN and
> PKT_TX_TUNNEL_IP_UNKNOWN could be a good alternative. It is only my humble
> two cents and I'd like to hear from more people regarding this.
>
This flag looks more like a feature notification. Current tunnel offloading
capability like "DEV_TX_OFFLOAD_VXLAN_TNL_TSO" ties to VXLAN tunnel type,
DEV_TX_OFFLOAD_GENERIC_TNL_TSO should be able to let users know that NIC's
capability of offloading generic tunnel type like MPLS-in-UDP that not defined
yet. PKT_TX_OUTER_UDP is something must to have to flag an exists of outer UDP
in such case.
>
> Thanks,
> Yongseok
next prev parent reply other threads:[~2018-03-22 13:55 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 [this message]
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
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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