From: "Morten Brørup" <mb@smartsharesystems.com>
To: <jerinj@marvell.com>, <dev@dpdk.org>,
"Thomas Monjalon" <thomas@monjalon.net>,
"Ferruh Yigit" <ferruh.yigit@amd.com>,
"Andrew Rybchenko" <andrew.rybchenko@oktetlabs.ru>
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<cristian.dumitrescu@intel.com>
Subject: RE: [dpdk-dev] [v1] ethdev: support Tx queue used count
Date: Thu, 11 Jan 2024 17:20:21 +0100 [thread overview]
Message-ID: <98CBD80474FA8B44BF855DF32C47DC35E9F12B@smartserver.smartshare.dk> (raw)
In-Reply-To: <20240111151745.3800170-1-jerinj@marvell.com>
> From: jerinj@marvell.com [mailto:jerinj@marvell.com]
> Sent: Thursday, 11 January 2024 16.18
>
> 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.
>
> Signed-off-by: Jerin Jacob <jerinj@marvell.com>
> ---
Generally looks good.
Only some minor suggestions/comments regarding rte_eth_tx_queue_count():
uint16_t tx_queue_id -> uint16_t queue_id
Everywhere, also in rte_ethdev_trace_fp.h.
Similarly in the log messages:
"Invalid Tx queue_id" -> "Invalid queue_id"
I don't like that rc = -EINVAL is reused instead of set explicitly for each error case.
Also, the return value -ENOTSUP is not traced.
Consider using an "out" label for a common return path to include trace, e.g.:
/**
* @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).
*
* Since it's a fast-path function, no check is performed on port_id and
* queue_id. The caller must therefore ensure that the port is enabled
* and the queue is configured and running.
*
* @param port_id
* The port identifier of the device.
* @param queue_id
* The index of the transmit queue.
* The value must be in the range [0, nb_tx_queue - 1] previously supplied
* to rte_eth_dev_configure().
* @return
* The number of used descriptors in the specific queue, or:
* - (-ENODEV) if *port_id* is invalid. Enabled only when RTE_ETHDEV_DEBUG_TX is enabled
* - (-EINVAL) if *queue_id* is invalid. Enabled only when RTE_ETHDEV_DEBUG_TX is enabled
* - (-ENOTSUP) if the device does not support this function.
*
* @note This function is designed for fast-path use.
*/
__rte_experimental
static inline int
rte_eth_tx_queue_count(uint16_t port_id, uint16_t queue_id)
{
struct rte_eth_fp_ops *fops;
void *qd;
int rc;
#ifdef RTE_ETHDEV_DEBUG_TX
if (port_id >= RTE_MAX_ETHPORTS || !rte_eth_dev_is_valid_port(port_id)) {
RTE_ETHDEV_LOG_LINE(ERR, "Invalid port_id=%u", port_id);
rc = -ENODEV;
goto out;
}
if (queue_id >= RTE_MAX_QUEUES_PER_PORT) {
RTE_ETHDEV_LOG_LINE(ERR, "Invalid queue_id=%u for port_id=%u",
queue_id, port_id);
rc = -EINVAL;
goto out;
}
#endif
/* Fetch pointer to Tx queue data */
fops = &rte_eth_fp_ops[port_id];
qd = fops->txq.data[queue_id];
#ifdef RTE_ETHDEV_DEBUG_TX
if (qd == NULL) {
RTE_ETHDEV_LOG_LINE(ERR, "Invalid queue_id=%u for port_id=%u",
queue_id, port_id);
rc = -EINVAL;
goto out;
}
#endif
if (fops->tx_queue_count == NULL) {
rc = -ENOTSUP;
goto out;
}
rc = fops->tx_queue_count(qd);
out:
rte_eth_trace_tx_queue_count(port_id, queue_id, rc);
return rc;
}
With or without suggested changes:
Acked-by: Morten Brørup <mb@smartsharesystems.com>
next prev parent reply other threads:[~2024-01-11 16:20 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 [this message]
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
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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