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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2010-2017 Intel Corporation
*/
#include "ethdev_profile.h"
/**
* This conditional block enables RX queues profiling by tracking wasted
* iterations, i.e. iterations which yielded no RX packets. Profiling is
* performed using the Instrumentation and Tracing Technology (ITT) API,
* employed by the Intel (R) VTune (TM) Amplifier.
*/
#ifdef RTE_ETHDEV_PROFILE_ITT_WASTED_RX_ITERATIONS
#include <ittnotify.h>
#define ITT_MAX_NAME_LEN (100)
/**
* Auxiliary ITT structure belonging to Ethernet device and using to:
* - track RX queue state to determine whether it is wasting loop iterations
* - begin or end ITT task using task domain and task name (handle)
*/
struct itt_profile_rx_data {
/**
* ITT domains for each queue.
*/
__itt_domain *domains[RTE_MAX_QUEUES_PER_PORT];
/**
* ITT task names for each queue.
*/
__itt_string_handle *handles[RTE_MAX_QUEUES_PER_PORT];
/**
* Flags indicating the queues state. Possible values:
* 1 - queue is wasting iterations,
* 0 - otherwise.
*/
uint8_t queue_state[RTE_MAX_QUEUES_PER_PORT];
};
/**
* The pool of *itt_profile_rx_data* structures.
*/
struct itt_profile_rx_data itt_rx_data[RTE_MAX_ETHPORTS];
/**
* This callback function manages ITT tasks collection on given port and queue.
* It must be registered with rte_eth_add_rx_callback() to be called from
* rte_eth_rx_burst(). To find more comments see rte_rx_callback_fn function
* type declaration.
*/
static uint16_t
collect_itt_rx_burst_cb(uint16_t port_id, uint16_t queue_id,
__rte_unused struct rte_mbuf *pkts[], uint16_t nb_pkts,
__rte_unused uint16_t max_pkts, __rte_unused void *user_param)
{
if (unlikely(nb_pkts == 0)) {
if (!itt_rx_data[port_id].queue_state[queue_id]) {
__itt_task_begin(
itt_rx_data[port_id].domains[queue_id],
__itt_null, __itt_null,
itt_rx_data[port_id].handles[queue_id]);
itt_rx_data[port_id].queue_state[queue_id] = 1;
}
} else {
if (unlikely(itt_rx_data[port_id].queue_state[queue_id])) {
__itt_task_end(
itt_rx_data[port_id].domains[queue_id]);
itt_rx_data[port_id].queue_state[queue_id] = 0;
}
}
return nb_pkts;
}
/**
* Initialization of itt_profile_rx_data for a given Ethernet device.
* This function must be invoked when ethernet device is being configured.
* Result will be stored in the global array *itt_rx_data*.
*
* @param port_id
* The port identifier of the Ethernet device.
* @param port_name
* The name of the Ethernet device.
* @param rx_queue_num
* The number of RX queues on specified port.
*
* @return
* - On success, zero.
* - On failure, a negative value.
*/
static inline int
itt_profile_rx_init(uint16_t port_id, char *port_name, uint8_t rx_queue_num)
{
uint16_t q_id;
for (q_id = 0; q_id < rx_queue_num; ++q_id) {
char domain_name[ITT_MAX_NAME_LEN];
snprintf(domain_name, sizeof(domain_name),
"RXBurst.WastedIterations.Port_%s.Queue_%d",
port_name, q_id);
itt_rx_data[port_id].domains[q_id]
= __itt_domain_create(domain_name);
char task_name[ITT_MAX_NAME_LEN];
snprintf(task_name, sizeof(task_name),
"port id: %d; queue id: %d",
port_id, q_id);
itt_rx_data[port_id].handles[q_id]
= __itt_string_handle_create(task_name);
itt_rx_data[port_id].queue_state[q_id] = 0;
if (!rte_eth_add_rx_callback(
port_id, q_id, collect_itt_rx_burst_cb, NULL)) {
return -rte_errno;
}
}
return 0;
}
#endif /* RTE_ETHDEV_PROFILE_ITT_WASTED_RX_ITERATIONS */
int
__rte_eth_profile_rx_init(__rte_unused uint16_t port_id,
__rte_unused struct rte_eth_dev *dev)
{
#ifdef RTE_ETHDEV_PROFILE_ITT_WASTED_RX_ITERATIONS
return itt_profile_rx_init(
port_id, dev->data->name, dev->data->nb_rx_queues);
#endif
return 0;
}
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