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From: Andrew Rybchenko <arybchenko@solarflare.com>
To: Viacheslav Ovsiienko <viacheslavo@mellanox.com>, <dev@dpdk.org>
Cc: <matan@mellanox.com>, <rasland@mellanox.com>,
	<thomas@monjalon.net>, <ferruh.yigit@intel.com>,
	<jerinjacobk@gmail.com>, <stephen@networkplumber.org>,
	<ajit.khaparde@broadcom.com>, <maxime.coquelin@redhat.com>,
	<olivier.matz@6wind.com>, <david.marchand@redhat.com>
Subject: Re: [dpdk-dev] [PATCH v2] doc: announce changes to ethdev rxconf structure
Date: Wed, 5 Aug 2020 14:14:43 +0300
Message-ID: <5fc9b97b-3b02-1f9f-9acd-333a92585d58@solarflare.com> (raw)
In-Reply-To: <1596617395-29271-1-git-send-email-viacheslavo@mellanox.com>

On 8/5/20 11:49 AM, Viacheslav Ovsiienko wrote:
> The DPDK datapath in the transmit direction is very flexible.
> The applications can build multi-segment packets and manages
> almost all data aspects - the memory pools where segments
> are allocated from, the segment lengths, the memory attributes
> like external, registered, etc.
> 
> In the receiving direction, the datapath is much less flexible,
> the applications can only specify the memory pool to configure
> the receiving queue and nothing more. The packet being received
> can only be pushed to the chain of the mbufs of the same data
> buffer size and allocated from the same pool. In order to extend
> the receiving datapath buffer description it is proposed to add
> the new fields into rte_eth_rxconf structure:
> 
> struct rte_eth_rxconf {
>     ...
>     uint16_t rx_split_num; /* number of segments to split */
>     uint16_t *rx_split_len; /* array of segment lengths */
>     struct rte_mempool **mp; /* array of segment memory pools */
>     ...
> };
> 
> The non-zero value of rx_split_num field configures the receiving
> queue to split ingress packets into multiple segments to the mbufs
> allocated from various memory pools according to the specified
> lengths. The zero value of rx_split_num field provides the
> backward compatibility and queue should be configured in a regular
> way (with single/multiple mbufs of the same data buffer length
> allocated from the single memory pool).
> 
> The new approach would allow splitting the ingress packets into
> multiple parts pushed to the memory with different attributes.
> For example, the packet headers can be pushed to the embedded data
> buffers within mbufs and the application data into the external
> buffers attached to mbufs allocated from the different memory
> pools. The memory attributes for the split parts may differ
> either - for example the application data may be pushed into
> the external memory located on the dedicated physical device,
> say GPU or NVMe. This would improve the DPDK receiving datapath
> flexibility preserving compatibility with existing API.
> 
> The proposed extended description of receiving buffers might be
> considered by other vendors to be involved into similar features
> support, it is the subject for the further discussion.
> 
> Signed-off-by: Viacheslav Ovsiienko <viacheslavo@mellanox.com>
> Acked-by: Jerin Jacob <jerinjacobk@gmail.com>

I"m OK with the idea in general and we'll work on details
in the next release cycle.

Acked-by: Andrew Rybchenko <arybchenko@solarflare.com>

  reply	other threads:[~2020-08-05 11:15 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-03 10:58 [dpdk-dev] [PATCH] " Viacheslav Ovsiienko
2020-08-03 11:56 ` Jerin Jacob
2020-08-03 13:06   ` Slava Ovsiienko
2020-08-04 13:32     ` Jerin Jacob
2020-08-05  6:35       ` Slava Ovsiienko
2020-08-06 15:58       ` Ferruh Yigit
2020-08-06 16:25         ` Stephen Hemminger
2020-08-06 16:41           ` Jerin Jacob
2020-08-06 17:03           ` Slava Ovsiienko
2020-08-06 18:10             ` Stephen Hemminger
2020-08-07 11:23               ` Slava Ovsiienko
2020-08-03 14:31 ` [dpdk-dev] ***Spam*** " Andrew Rybchenko
2020-08-06 16:15   ` [dpdk-dev] " Ferruh Yigit
2020-08-06 16:29     ` Slava Ovsiienko
2020-08-06 16:37       ` Ferruh Yigit
2020-08-06 16:39         ` Slava Ovsiienko
2020-08-06 16:43           ` Ferruh Yigit
2020-08-06 16:48             ` Slava Ovsiienko
2020-08-05  8:49 ` [dpdk-dev] [PATCH v2] " Viacheslav Ovsiienko
2020-08-05 11:14   ` Andrew Rybchenko [this message]
2020-08-06 12:39     ` Thomas Monjalon
2020-08-06 21:42       ` Thomas Monjalon
2020-08-06 16:31   ` Ferruh Yigit
2020-08-06 17:00     ` Slava Ovsiienko
2020-08-06 16:55   ` [dpdk-dev] [PATCH v2] doc: fix the release notes for Mellanox PMD Viacheslav Ovsiienko
2020-08-06 17:12     ` Asaf Penso
2020-08-06 22:37       ` Thomas Monjalon

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