From: "Morten Brørup" <mb@smartsharesystems.com>
To: "Ferruh Yigit" <ferruh.yigit@amd.com>, <jerinj@marvell.com>,
<dev@dpdk.org>, "Thomas Monjalon" <thomas@monjalon.net>,
"Andrew Rybchenko" <andrew.rybchenko@oktetlabs.ru>
Cc: <ferruh.yigit@xilinx.com>, <ajit.khaparde@broadcom.com>,
<aboyer@pensando.io>, <beilei.xing@intel.com>,
<bruce.richardson@intel.com>, <chas3@att.com>,
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<dsinghrawat@marvell.com>, <ed.czeck@atomicrules.com>,
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<hkalra@marvell.com>, <heinrich.kuhn@corigine.com>,
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<cristian.dumitrescu@intel.com>
Subject: RE: [dpdk-dev] [v1] ethdev: support Tx queue used count
Date: Fri, 12 Jan 2024 13:29:58 +0100 [thread overview]
Message-ID: <98CBD80474FA8B44BF855DF32C47DC35E9F13C@smartserver.smartshare.dk> (raw)
In-Reply-To: <5251f00a-a039-460d-805b-0325cfced32b@amd.com>
> From: Ferruh Yigit [mailto:ferruh.yigit@amd.com]
> Sent: Friday, 12 January 2024 12.34
>
> On 1/11/2024 3:17 PM, jerinj@marvell.com wrote:
> > From: Jerin Jacob <jerinj@marvell.com>
> >
> > Introduce a new API to retrieve the number of used descriptors
> > in a Tx queue. Applications can leverage this API in the fast path to
> > inspect the Tx queue occupancy and take appropriate actions based on
> the
> > available free descriptors.
> >
> > A notable use case could be implementing Random Early Discard (RED)
> > in software based on Tx queue occupancy.
[...]
> > +/**
> > + * @warning
> > + * @b EXPERIMENTAL: this API may change, or be removed, without
> prior notice
> > + *
> > + * Get the number of used descriptors of a Tx queue
> > + *
> > + * This function retrieves the number of used descriptors of a
> transmit queue.
> > + * Applications can use this API in the fast path to inspect Tx
> queue occupancy and take
> > + * appropriate actions based on the available free descriptors.
> > + * An example action could be implementing the Random Early Discard
> (RED).
> >
>
> Above is good, but do you think does it help to mention that intended
> usacase is QoS, to address the risk Bruce mentioned?
A better way to address the risk is to mention that:
1. there is no need to call this function before rte_eth_tx_burst(), and
2. tx_descriptor_status() has better performance for checking a threshold than this function.
> > /**
> > * @internal
> > * Structure used to hold opaque pointers to internal ethdev Rx/Tx
> > @@ -116,7 +119,9 @@ struct rte_eth_fp_ops {
> > eth_tx_descriptor_status_t tx_descriptor_status;
> > /** Copy used mbufs from Tx mbuf ring into Rx. */
> > eth_recycle_tx_mbufs_reuse_t recycle_tx_mbufs_reuse;
> > - uintptr_t reserved2[2];
> > + /** Get the number of used Tx descriptors. */
> > + eth_tx_queue_count_t tx_queue_count;
> >
>
> Similarly, can you please move it above 'tx_descriptor_status'?
No. I think struct rte_eth_fp_ops is part of the public API, so moving down tx_descriptor_status and recycle_tx_mbufs_reuse would break the API.
>
>
> > + uintptr_t reserved2[1];
> > /**@}*/
> >
> > } __rte_cache_aligned;
next prev parent reply other threads:[~2024-01-12 12:30 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-19 17:29 [dpdk-dev] [RFC] ethdev: support Tx queue free descriptor query jerinj
2024-01-04 13:16 ` Dumitrescu, Cristian
2024-01-04 13:35 ` Jerin Jacob
2024-01-04 14:21 ` Konstantin Ananyev
2024-01-04 18:29 ` Thomas Monjalon
2024-01-05 9:57 ` Jerin Jacob
2024-01-05 10:03 ` Thomas Monjalon
2024-01-05 11:12 ` Konstantin Ananyev
2024-01-08 20:54 ` Morten Brørup
2024-01-09 14:45 ` Jerin Jacob
2024-01-04 21:17 ` Thomas Monjalon
2024-01-05 9:54 ` Jerin Jacob
2024-01-05 10:02 ` Thomas Monjalon
2024-01-08 10:54 ` Bruce Richardson
2024-01-08 21:15 ` Morten Brørup
2024-01-09 8:47 ` Bruce Richardson
2024-01-12 10:56 ` Ferruh Yigit
2024-01-11 15:17 ` [dpdk-dev] [v1] ethdev: support Tx queue used count jerinj
2024-01-11 16:17 ` Andrew Rybchenko
2024-01-12 6:56 ` Jerin Jacob
2024-01-11 16:20 ` Morten Brørup
2024-01-12 6:59 ` Jerin Jacob
2024-01-11 17:00 ` Stephen Hemminger
2024-01-12 7:01 ` Jerin Jacob
2024-01-12 16:30 ` Stephen Hemminger
2024-01-12 8:02 ` David Marchand
2024-01-12 9:29 ` Jerin Jacob
2024-01-12 11:34 ` Ferruh Yigit
2024-01-12 12:11 ` David Marchand
2024-01-12 14:25 ` Ferruh Yigit
2024-01-12 12:29 ` Morten Brørup [this message]
2024-01-12 14:29 ` Ferruh Yigit
2024-01-18 9:06 ` Jerin Jacob
2024-01-12 12:33 ` Konstantin Ananyev
2024-01-16 6:37 ` Jerin Jacob
2024-01-18 10:17 ` Konstantin Ananyev
2024-01-18 11:21 ` Jerin Jacob
2024-01-18 13:36 ` Morten Brørup
2024-01-19 9:52 ` Konstantin Ananyev
2024-01-19 10:32 ` Morten Brørup
2024-01-12 16:52 ` Stephen Hemminger
2024-01-18 9:47 ` [dpdk-dev] [v2] " jerinj
2024-01-22 13:00 ` Konstantin Ananyev
2024-01-23 11:46 ` Ferruh Yigit
2024-02-07 20:30 ` Ferruh Yigit
2024-01-29 15:03 ` Ferruh Yigit
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