From: Slava Ovsiienko <viacheslavo@nvidia.com> To: Andrew Rybchenko <arybchenko@solarflare.com>, "dev@dpdk.org" <dev@dpdk.org> Cc: Thomas Monjalon <thomasm@mellanox.com>, "stephen@networkplumber.org" <stephen@networkplumber.org>, "ferruh.yigit@intel.com" <ferruh.yigit@intel.com>, Shahaf Shuler <shahafs@nvidia.com>, "olivier.matz@6wind.com" <olivier.matz@6wind.com>, "jerinjacobk@gmail.com" <jerinjacobk@gmail.com>, "maxime.coquelin@redhat.com" <maxime.coquelin@redhat.com>, "david.marchand@redhat.com" <david.marchand@redhat.com>, Asaf Penso <asafp@nvidia.com> Subject: Re: [dpdk-dev] [RFC] ethdev: introduce Rx buffer split Date: Thu, 1 Oct 2020 08:54:08 +0000 Message-ID: <MWHPR12MB136043614F2547739FE799ABDF300@MWHPR12MB1360.namprd12.prod.outlook.com> (raw) In-Reply-To: <1870d31a-0ec1-4198-fcee-03646c009458@solarflare.com> Hi, Andrew Thank you for the comments, please see my replies below. > -----Original Message----- > From: Andrew Rybchenko <arybchenko@solarflare.com> > Sent: Thursday, September 17, 2020 19:55 > To: Slava Ovsiienko <viacheslavo@nvidia.com>; dev@dpdk.org > Cc: Thomas Monjalon <thomasm@mellanox.com>; > stephen@networkplumber.org; ferruh.yigit@intel.com; Shahaf Shuler > <shahafs@nvidia.com>; olivier.matz@6wind.com; jerinjacobk@gmail.com; > maxime.coquelin@redhat.com; david.marchand@redhat.com; Asaf Penso > <asafp@nvidia.com> > Subject: Re: [dpdk-dev] [RFC] ethdev: introduce Rx buffer split > [snip] > > > > For example, let's suppose we configured the Rx queue with the > > following segments: > > seg0 - pool0, len0=14B, off0=RTE_PKTMBUF_HEADROOM > > seg1 - pool1, len1=20B, off1=0B > > seg2 - pool2, len2=20B, off2=0B > > seg3 - pool3, len3=512B, off3=0B > > > > The packet 46 bytes long will look like the following: > > seg0 - 14B long @ RTE_PKTMBUF_HEADROOM in mbuf from pool0 > > seg1 - 20B long @ 0 in mbuf from pool1 > > seg2 - 12B long @ 0 in mbuf from pool2 > > > > The packet 1500 bytes long will look like the following: > > seg0 - 14B @ RTE_PKTMBUF_HEADROOM in mbuf from pool0 > > seg1 - 20B @ 0 in mbuf from pool1 > > seg2 - 20B @ 0 in mbuf from pool2 > > seg3 - 512B @ 0 in mbuf from pool3 > > seg4 - 512B @ 0 in mbuf from pool3 > > seg5 - 422B @ 0 in mbuf from pool3 > > The behaviour is logical, but what to do if HW can't do it, i.e. use the last > segment many times. Should it reject configuration if provided segments are > insufficient to fit MTU packet? How to report the limitation? > (I'm still trying to convince that SCATTER and BUFFER_SPLIT should be > independent). BUFFER_SPLIT is rather the way to tune SCATTER. Currently scattering happens on unconditional mbuf data buffer boundaries (we have reserved HEAD space in the first mbuf and fill this one to the buffer end, the next mbuf buffers might be filled completely). BUFFER_SPLIT provides the way to specify the desired points to split packet, not just blindly follow buffer boundaries. There is the check inplemented in common part if each split segment fits the mbuf allocated from appropriate pool. PMD should do extra check internally whether it supports the requested split settings, if not - call will be rejected. [snip] > > I dislike the idea to introduce new device operation. > rte_eth_rxconf has reserved space and BUFFER_SPLIT offload will mean that > PMD looks at the split configuration location there. > We considered the approach of pushing split setting to the rxconf structure. [http://patches.dpdk.org/patch/75205/] But it seems there are some issues: - the split configuration description requires the variable length array (due to variations in number of segments), so rte_eth_rxconf structure would have the variable length (not nice, IMO). We could push pointers to the array of rte_eth_rxseg, but we would lost the single structure (and contiguous memory) simplicity, this approach has no advantages over the specifying the split configuration as parameters of setup_ex(). - it would introduces the ambiguity, rte_eth_rx_queue_setup() specifies the single mbuf pool as parameter. What should we do with it? Set to NULL? Treat as the first pool? I would prefer to specify all split segments in uniform fashion, i.e. as array or rte_eth_rxseg structures (and it can be easily updated with some extra segment attributes if needed). So, in my opinion, we should remove/replace the pool parameter in rx_queue_setup (by introducing new func). - specifying the new extended setup roiutine has an advantage that we should not update any PMDs code in part of existing implementations of rte_eth_rx_queue_setup(). If PMD supports BUFFER_SPLIT (or other related feature) it just should provide rte_eth_rx_queue_setup_ex() and check the DEV_RX_OFFLOAD_BUFFER_SPLIT (or HEADER_SPLIT, or ever feature) it supports. The common code does not check the feature flags - it is on PMDs' own. In order to configure PMD to perfrom arbitrary desired Rx spliting the application should check DEV_RX_OFFLOAD_BUFFER_SPLIT in port capabilites, if found - set DEV_RX_OFFLOAD_BUFFER_SPLIT in configuration and call rte_eth_rx_queue_setup_ex(). And this approach can be followed for any other split related feature. With best regards, Slava
next prev parent reply other threads:[~2020-10-01 8:54 UTC|newest] Thread overview: 172+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-08-17 17:49 Slava Ovsiienko 2020-09-17 16:55 ` Andrew Rybchenko 2020-10-01 8:54 ` Slava Ovsiienko [this message] 2020-10-12 8:45 ` Andrew Rybchenko 2020-10-12 9:56 ` Slava Ovsiienko 2020-10-12 15:14 ` Thomas Monjalon 2020-10-12 15:28 ` Ananyev, Konstantin 2020-10-12 15:34 ` Slava Ovsiienko 2020-10-12 15:56 ` Ananyev, Konstantin 2020-10-12 15:59 ` Slava Ovsiienko 2020-10-12 16:52 ` Thomas Monjalon 2020-10-12 16:03 ` Andrew Rybchenko 2020-10-12 16:10 ` Slava Ovsiienko 2020-10-13 21:59 ` Ferruh Yigit 2020-10-14 7:17 ` Thomas Monjalon 2020-10-14 7:37 ` Slava Ovsiienko 2020-10-05 6:26 ` [dpdk-dev] [PATCH 0/5] " Viacheslav Ovsiienko 2020-10-05 6:26 ` [dpdk-dev] [PATCH 1/5] " Viacheslav Ovsiienko 2020-10-05 6:26 ` [dpdk-dev] [PATCH 2/5] app/testpmd: add multiple pools per core creation Viacheslav Ovsiienko 2020-10-05 6:26 ` [dpdk-dev] [PATCH 3/5] app/testpmd: add buffer split offload configuration Viacheslav Ovsiienko 2020-10-05 6:26 ` [dpdk-dev] [PATCH 4/5] app/testpmd: add rxpkts commands and parameters Viacheslav Ovsiienko 2020-10-05 6:26 ` [dpdk-dev] [PATCH 5/5] app/testpmd: add extended Rx queue setup Viacheslav Ovsiienko 2020-10-07 15:06 ` [dpdk-dev] [PATCH v2 0/9] ethdev: introduce Rx buffer split Viacheslav Ovsiienko 2020-10-07 15:06 ` [dpdk-dev] [PATCH v2 1/9] " Viacheslav Ovsiienko 2020-10-11 22:17 ` Thomas Monjalon 2020-10-12 9:40 ` Slava Ovsiienko 2020-10-12 10:09 ` Thomas Monjalon 2020-10-07 15:06 ` [dpdk-dev] [PATCH v2 2/9] app/testpmd: add multiple pools per core creation Viacheslav Ovsiienko 2020-10-07 15:06 ` [dpdk-dev] [PATCH v2 3/9] app/testpmd: add buffer split offload configuration Viacheslav Ovsiienko 2020-10-07 15:06 ` [dpdk-dev] [PATCH v2 4/9] app/testpmd: add rxpkts commands and parameters Viacheslav Ovsiienko 2020-10-07 15:06 ` [dpdk-dev] [PATCH v2 5/9] app/testpmd: add extended Rx queue setup Viacheslav Ovsiienko 2020-10-07 15:06 ` [dpdk-dev] [PATCH v2 6/9] net/mlx5: add extended Rx queue setup routine Viacheslav Ovsiienko 2020-10-07 15:06 ` [dpdk-dev] [PATCH v2 7/9] net/mlx5: configure Rx queue to support split Viacheslav Ovsiienko 2020-10-07 15:06 ` [dpdk-dev] [PATCH v2 8/9] net/mlx5: register multiple pool for Rx queue Viacheslav Ovsiienko 2020-10-07 15:06 ` [dpdk-dev] [PATCH v2 9/9] net/mlx5: update Rx datapath to support split Viacheslav Ovsiienko 2020-10-12 16:19 ` [dpdk-dev] [PATCH v3 0/9] ethdev: introduce Rx buffer split Viacheslav Ovsiienko 2020-10-12 16:19 ` [dpdk-dev] [PATCH v3 1/9] " Viacheslav Ovsiienko 2020-10-12 16:38 ` Andrew Rybchenko 2020-10-12 17:03 ` Thomas Monjalon 2020-10-12 17:11 ` Andrew Rybchenko 2020-10-12 20:22 ` Slava Ovsiienko 2020-10-12 17:11 ` Slava Ovsiienko 2020-10-12 16:19 ` [dpdk-dev] [PATCH v3 2/9] app/testpmd: add multiple pools per core creation Viacheslav Ovsiienko 2020-10-12 16:19 ` [dpdk-dev] [PATCH v3 3/9] app/testpmd: add buffer split offload configuration Viacheslav Ovsiienko 2020-10-12 16:19 ` [dpdk-dev] [PATCH v3 4/9] app/testpmd: add rxpkts commands and parameters Viacheslav Ovsiienko 2020-10-12 16:19 ` [dpdk-dev] [PATCH v3 5/9] app/testpmd: add extended Rx queue setup Viacheslav Ovsiienko 2020-10-12 16:19 ` [dpdk-dev] [PATCH v3 6/9] net/mlx5: add extended Rx queue setup routine Viacheslav Ovsiienko 2020-10-12 16:19 ` [dpdk-dev] [PATCH v3 7/9] net/mlx5: configure Rx queue to support split Viacheslav Ovsiienko 2020-10-12 16:19 ` [dpdk-dev] [PATCH v3 8/9] net/mlx5: register multiple pool for Rx queue Viacheslav Ovsiienko 2020-10-12 16:19 ` [dpdk-dev] [PATCH v3 9/9] net/mlx5: update Rx datapath to support split Viacheslav Ovsiienko 2020-10-12 20:09 ` [dpdk-dev] [PATCH v4 0/9] ethdev: introduce Rx buffer split Viacheslav Ovsiienko 2020-10-12 20:09 ` [dpdk-dev] [PATCH v4 1/9] " Viacheslav Ovsiienko 2020-10-12 20:09 ` [dpdk-dev] [PATCH v4 2/9] app/testpmd: add multiple pools per core creation Viacheslav Ovsiienko 2020-10-12 20:09 ` [dpdk-dev] [PATCH v4 3/9] app/testpmd: add buffer split offload configuration Viacheslav Ovsiienko 2020-10-12 20:09 ` [dpdk-dev] [PATCH v4 4/9] app/testpmd: add rxpkts commands and parameters Viacheslav Ovsiienko 2020-10-12 20:09 ` [dpdk-dev] [PATCH v4 5/9] app/testpmd: add extended Rx queue setup Viacheslav Ovsiienko 2020-10-12 20:09 ` [dpdk-dev] [PATCH v4 6/9] net/mlx5: add extended Rx queue setup routine Viacheslav Ovsiienko 2020-10-12 20:10 ` [dpdk-dev] [PATCH v4 7/9] net/mlx5: configure Rx queue to support split Viacheslav Ovsiienko 2020-10-12 20:10 ` [dpdk-dev] [PATCH v4 8/9] net/mlx5: register multiple pool for Rx queue Viacheslav Ovsiienko 2020-10-12 20:10 ` [dpdk-dev] [PATCH v4 9/9] net/mlx5: update Rx datapath to support split Viacheslav Ovsiienko 2020-10-13 19:21 ` [dpdk-dev] [PATCH v5 0/6] ethdev: introduce Rx buffer split Viacheslav Ovsiienko 2020-10-13 19:21 ` [dpdk-dev] [PATCH v5 1/6] " Viacheslav Ovsiienko 2020-10-13 22:34 ` Ferruh Yigit 2020-10-14 13:31 ` Olivier Matz 2020-10-14 14:42 ` Slava Ovsiienko 2020-10-13 19:21 ` [dpdk-dev] [PATCH v5 2/6] app/testpmd: add multiple pools per core creation Viacheslav Ovsiienko 2020-10-13 19:21 ` [dpdk-dev] [PATCH v5 3/6] app/testpmd: add buffer split offload configuration Viacheslav Ovsiienko 2020-10-13 19:21 ` [dpdk-dev] [PATCH v5 4/6] app/testpmd: add rxpkts commands and parameters Viacheslav Ovsiienko 2020-10-13 19:21 ` [dpdk-dev] [PATCH v5 5/6] app/testpmd: add rxoffs " Viacheslav Ovsiienko 2020-10-13 19:21 ` [dpdk-dev] [PATCH v5 6/6] app/testpmd: add extended Rx queue setup Viacheslav Ovsiienko 2020-10-14 18:11 ` [dpdk-dev] [PATCH v6 0/6] ethdev: introduce Rx buffer split Viacheslav Ovsiienko 2020-10-14 18:11 ` [dpdk-dev] [PATCH v6 1/6] " Viacheslav Ovsiienko 2020-10-14 18:57 ` Jerin Jacob 2020-10-15 7:43 ` Slava Ovsiienko 2020-10-15 9:27 ` Jerin Jacob 2020-10-15 10:27 ` Jerin Jacob 2020-10-15 10:51 ` Slava Ovsiienko 2020-10-15 11:26 ` Jerin Jacob 2020-10-15 11:36 ` Ferruh Yigit 2020-10-15 11:49 ` Slava Ovsiienko 2020-10-15 12:49 ` Thomas Monjalon 2020-10-15 13:07 ` Andrew Rybchenko 2020-10-15 13:57 ` Slava Ovsiienko 2020-10-15 20:22 ` Slava Ovsiienko 2020-10-15 9:49 ` Andrew Rybchenko 2020-10-15 10:34 ` Slava Ovsiienko 2020-10-15 11:09 ` Andrew Rybchenko 2020-10-15 14:39 ` Slava Ovsiienko 2020-10-14 22:13 ` Thomas Monjalon 2020-10-14 22:50 ` Ajit Khaparde 2020-10-15 10:11 ` Andrew Rybchenko 2020-10-15 10:19 ` Thomas Monjalon 2020-10-14 18:11 ` [dpdk-dev] [PATCH v6 2/6] app/testpmd: add multiple pools per core creation Viacheslav Ovsiienko 2020-10-14 18:11 ` [dpdk-dev] [PATCH v6 3/6] app/testpmd: add buffer split offload configuration Viacheslav Ovsiienko 2020-10-14 18:12 ` [dpdk-dev] [PATCH v6 4/6] app/testpmd: add rxpkts commands and parameters Viacheslav Ovsiienko 2020-10-14 18:12 ` [dpdk-dev] [PATCH v6 5/6] app/testpmd: add rxoffs " Viacheslav Ovsiienko 2020-10-14 18:12 ` [dpdk-dev] [PATCH v6 6/6] app/testpmd: add extended Rx queue setup Viacheslav Ovsiienko 2020-10-15 0:55 ` [dpdk-dev] [PATCH v2] eal/rte_malloc: add alloc_size() attribute to allocation functions Stephen Hemminger 2020-10-19 14:13 ` Thomas Monjalon 2020-10-19 14:22 ` Thomas Monjalon 2020-10-15 20:17 ` [dpdk-dev] [PATCH v7 0/6] ethdev: introduce Rx buffer split Viacheslav Ovsiienko 2020-10-15 20:17 ` [dpdk-dev] [PATCH v7 1/6] " Viacheslav Ovsiienko 2020-10-15 20:30 ` Jerin Jacob 2020-10-15 20:33 ` Thomas Monjalon 2020-10-15 22:01 ` Ajit Khaparde 2020-10-15 20:17 ` [dpdk-dev] [PATCH v7 2/6] app/testpmd: add multiple pools per core creation Viacheslav Ovsiienko 2020-10-15 20:17 ` [dpdk-dev] [PATCH v7 3/6] app/testpmd: add buffer split offload configuration Viacheslav Ovsiienko 2020-10-15 20:17 ` [dpdk-dev] [PATCH v7 4/6] app/testpmd: add rxpkts commands and parameters Viacheslav Ovsiienko 2020-10-15 20:17 ` [dpdk-dev] [PATCH v7 5/6] app/testpmd: add rxoffs " Viacheslav Ovsiienko 2020-10-15 20:17 ` [dpdk-dev] [PATCH v7 6/6] app/testpmd: add extended Rx queue setup Viacheslav Ovsiienko 2020-10-16 7:48 ` [dpdk-dev] [PATCH v8 0/6] ethdev: introduce Rx buffer split Viacheslav Ovsiienko 2020-10-16 7:48 ` [dpdk-dev] [PATCH v8 1/6] " Viacheslav Ovsiienko 2020-10-16 8:51 ` Andrew Rybchenko 2020-10-16 8:58 ` Andrew Rybchenko 2020-10-16 9:15 ` Slava Ovsiienko 2020-10-16 9:27 ` Andrew Rybchenko 2020-10-16 9:34 ` Slava Ovsiienko 2020-10-16 9:37 ` Thomas Monjalon 2020-10-16 9:38 ` Slava Ovsiienko 2020-10-16 9:19 ` Ferruh Yigit 2020-10-16 9:21 ` Andrew Rybchenko 2020-10-16 9:22 ` Slava Ovsiienko 2020-10-16 7:48 ` [dpdk-dev] [PATCH v8 2/6] app/testpmd: add multiple pools per core creation Viacheslav Ovsiienko 2020-10-16 7:48 ` [dpdk-dev] [PATCH v8 3/6] app/testpmd: add buffer split offload configuration Viacheslav Ovsiienko 2020-10-16 7:48 ` [dpdk-dev] [PATCH v8 4/6] app/testpmd: add rxpkts commands and parameters Viacheslav Ovsiienko 2020-10-16 7:48 ` [dpdk-dev] [PATCH v8 5/6] app/testpmd: add rxoffs " Viacheslav Ovsiienko 2020-10-16 7:48 ` [dpdk-dev] [PATCH v8 6/6] app/testpmd: add extended Rx queue setup Viacheslav Ovsiienko 2020-10-16 10:22 ` [dpdk-dev] [PATCH v9 0/6] ethdev: introduce Rx buffer split Viacheslav Ovsiienko 2020-10-16 10:22 ` [dpdk-dev] [PATCH v9 1/6] " Viacheslav Ovsiienko 2020-10-16 11:21 ` Ferruh Yigit 2020-10-16 13:08 ` Slava Ovsiienko 2020-10-16 10:22 ` [dpdk-dev] [PATCH v9 2/6] app/testpmd: add multiple pools per core creation Viacheslav Ovsiienko 2020-10-16 10:22 ` [dpdk-dev] [PATCH v9 3/6] app/testpmd: add buffer split offload configuration Viacheslav Ovsiienko 2020-10-16 10:22 ` [dpdk-dev] [PATCH v9 4/6] app/testpmd: add rxpkts commands and parameters Viacheslav Ovsiienko 2020-10-16 10:22 ` [dpdk-dev] [PATCH v9 5/6] app/testpmd: add rxoffs " Viacheslav Ovsiienko 2020-10-16 10:22 ` [dpdk-dev] [PATCH v9 6/6] app/testpmd: add extended Rx queue setup Viacheslav Ovsiienko 2020-10-16 12:41 ` [dpdk-dev] [PATCH v10 0/6] ethdev: introduce Rx buffer split Viacheslav Ovsiienko 2020-10-16 12:41 ` [dpdk-dev] [PATCH v10 1/6] " Viacheslav Ovsiienko 2020-10-16 12:41 ` [dpdk-dev] [PATCH v10 2/6] app/testpmd: add multiple pools per core creation Viacheslav Ovsiienko 2020-10-16 12:41 ` [dpdk-dev] [PATCH v10 3/6] app/testpmd: add buffer split offload configuration Viacheslav Ovsiienko 2020-10-16 12:41 ` [dpdk-dev] [PATCH v10 4/6] app/testpmd: add rxpkts commands and parameters Viacheslav Ovsiienko 2020-10-16 12:41 ` [dpdk-dev] [PATCH v10 5/6] app/testpmd: add rxoffs " Viacheslav Ovsiienko 2020-10-16 12:41 ` [dpdk-dev] [PATCH v10 6/6] app/testpmd: add extended Rx queue setup Viacheslav Ovsiienko 2020-10-16 13:39 ` [dpdk-dev] [PATCH v11 0/6] ethdev: introduce Rx buffer split Viacheslav Ovsiienko 2020-10-16 13:39 ` [dpdk-dev] [PATCH v11 1/6] " Viacheslav Ovsiienko 2020-10-16 15:14 ` Thomas Monjalon 2020-10-16 16:18 ` Slava Ovsiienko 2020-10-16 15:47 ` Ferruh Yigit 2020-10-16 16:05 ` Thomas Monjalon 2020-10-16 16:06 ` Ferruh Yigit 2020-10-16 13:39 ` [dpdk-dev] [PATCH v11 2/6] app/testpmd: add multiple pools per core creation Viacheslav Ovsiienko 2020-10-16 15:05 ` Ferruh Yigit 2020-10-16 15:38 ` Ferruh Yigit 2020-10-16 15:48 ` Slava Ovsiienko 2020-10-16 15:52 ` Ferruh Yigit 2020-10-16 15:55 ` Slava Ovsiienko 2020-10-16 15:57 ` Ferruh Yigit 2020-10-16 13:39 ` [dpdk-dev] [PATCH v11 3/6] app/testpmd: add buffer split offload configuration Viacheslav Ovsiienko 2020-10-16 13:39 ` [dpdk-dev] [PATCH v11 4/6] app/testpmd: add rxpkts commands and parameters Viacheslav Ovsiienko 2020-10-16 13:39 ` [dpdk-dev] [PATCH v11 5/6] app/testpmd: add rxoffs " Viacheslav Ovsiienko 2020-10-16 13:39 ` [dpdk-dev] [PATCH v11 6/6] app/testpmd: add extended Rx queue setup Viacheslav Ovsiienko 2020-10-16 16:44 ` [dpdk-dev] [PATCH v12 0/6] ethdev: introduce Rx buffer split Viacheslav Ovsiienko 2020-10-16 16:44 ` [dpdk-dev] [PATCH v12 1/6] " Viacheslav Ovsiienko 2020-10-16 19:22 ` Ferruh Yigit 2020-10-16 21:36 ` Ferruh Yigit 2020-10-16 16:44 ` [dpdk-dev] [PATCH v12 2/6] app/testpmd: add multiple pools per core creation Viacheslav Ovsiienko 2020-10-16 16:44 ` [dpdk-dev] [PATCH v12 3/6] app/testpmd: add buffer split offload configuration Viacheslav Ovsiienko 2020-10-16 16:44 ` [dpdk-dev] [PATCH v12 4/6] app/testpmd: add rxpkts commands and parameters Viacheslav Ovsiienko 2020-10-16 16:44 ` [dpdk-dev] [PATCH v12 5/6] app/testpmd: add rxoffs " Viacheslav Ovsiienko 2020-10-16 16:44 ` [dpdk-dev] [PATCH v12 6/6] app/testpmd: add extended Rx queue setup Viacheslav Ovsiienko 2020-10-16 17:05 ` [dpdk-dev] [PATCH v12 0/6] ethdev: introduce Rx buffer split Ferruh Yigit 2020-10-16 17:07 ` Slava Ovsiienko
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