4d51afb5cd
Add new statistic to keep track of drops due to RED. Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
456 lines
15 KiB
C
456 lines
15 KiB
C
/*-
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* BSD LICENSE
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*
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* Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Intel Corporation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef __INCLUDE_RTE_SCHED_H__
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#define __INCLUDE_RTE_SCHED_H__
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @file
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* RTE Hierarchical Scheduler
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*
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* The hierarchical scheduler prioritizes the transmission of packets
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* from different users and traffic classes according to the Service
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* Level Agreements (SLAs) defined for the current network node.
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*
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* The scheduler supports thousands of packet queues grouped under a
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* 5-level hierarchy:
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* 1. Port:
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* - Typical usage: output Ethernet port;
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* - Multiple ports are scheduled in round robin order with
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* equal priority;
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* 2. Subport:
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* - Typical usage: group of users;
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* - Traffic shaping using the token bucket algorithm
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* (one bucket per subport);
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* - Upper limit enforced per traffic class at subport level;
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* - Lower priority traffic classes able to reuse subport
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* bandwidth currently unused by higher priority traffic
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* classes of the same subport;
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* - When any subport traffic class is oversubscribed
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* (configuration time event), the usage of subport member
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* pipes with high demand for thattraffic class pipes is
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* truncated to a dynamically adjusted value with no
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* impact to low demand pipes;
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* 3. Pipe:
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* - Typical usage: individual user/subscriber;
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* - Traffic shaping using the token bucket algorithm
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* (one bucket per pipe);
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* 4. Traffic class:
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* - Traffic classes of the same pipe handled in strict
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* priority order;
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* - Upper limit enforced per traffic class at the pipe level;
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* - Lower priority traffic classes able to reuse pipe
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* bandwidth currently unused by higher priority traffic
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* classes of the same pipe;
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* 5. Queue:
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* - Typical usage: queue hosting packets from one or
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* multiple connections of same traffic class belonging to
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* the same user;
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* - Weighted Round Robin (WRR) is used to service the
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* queues within same pipe traffic class.
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*
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*/
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#include <sys/types.h>
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#include <rte_mbuf.h>
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#include <rte_meter.h>
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/** Random Early Detection (RED) */
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#ifdef RTE_SCHED_RED
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#include "rte_red.h"
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#endif
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/** Number of traffic classes per pipe (as well as subport).
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* Cannot be changed.
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*/
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#define RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE 4
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/** Number of queues per pipe traffic class. Cannot be changed. */
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#define RTE_SCHED_QUEUES_PER_TRAFFIC_CLASS 4
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/** Number of queues per pipe. */
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#define RTE_SCHED_QUEUES_PER_PIPE \
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(RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE * \
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RTE_SCHED_QUEUES_PER_TRAFFIC_CLASS)
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/** Maximum number of pipe profiles that can be defined per port.
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* Compile-time configurable.
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*/
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#ifndef RTE_SCHED_PIPE_PROFILES_PER_PORT
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#define RTE_SCHED_PIPE_PROFILES_PER_PORT 256
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#endif
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/*
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* Ethernet framing overhead. Overhead fields per Ethernet frame:
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* 1. Preamble: 7 bytes;
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* 2. Start of Frame Delimiter (SFD): 1 byte;
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* 3. Frame Check Sequence (FCS): 4 bytes;
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* 4. Inter Frame Gap (IFG): 12 bytes.
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*
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* The FCS is considered overhead only if not included in the packet
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* length (field pkt_len of struct rte_mbuf).
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*/
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#ifndef RTE_SCHED_FRAME_OVERHEAD_DEFAULT
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#define RTE_SCHED_FRAME_OVERHEAD_DEFAULT 24
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#endif
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/*
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* Subport configuration parameters. The period and credits_per_period
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* parameters are measured in bytes, with one byte meaning the time
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* duration associated with the transmission of one byte on the
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* physical medium of the output port, with pipe or pipe traffic class
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* rate (measured as percentage of output port rate) determined as
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* credits_per_period divided by period. One credit represents one
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* byte.
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*/
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struct rte_sched_subport_params {
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/* Subport token bucket */
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uint32_t tb_rate; /**< Rate (measured in bytes per second) */
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uint32_t tb_size; /**< Size (measured in credits) */
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/* Subport traffic classes */
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uint32_t tc_rate[RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE];
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/**< Traffic class rates (measured in bytes per second) */
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uint32_t tc_period;
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/**< Enforcement period for rates (measured in milliseconds) */
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};
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/** Subport statistics */
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struct rte_sched_subport_stats {
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/* Packets */
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uint32_t n_pkts_tc[RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE];
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/**< Number of packets successfully written */
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uint32_t n_pkts_tc_dropped[RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE];
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/**< Number of packets dropped */
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/* Bytes */
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uint32_t n_bytes_tc[RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE];
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/**< Number of bytes successfully written for each traffic class */
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uint32_t n_bytes_tc_dropped[RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE];
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/**< Number of bytes dropped for each traffic class */
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#ifdef RTE_SCHED_RED
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uint32_t n_pkts_red_dropped[RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE];
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/**< Number of packets dropped by red */
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#endif
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};
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/*
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* Pipe configuration parameters. The period and credits_per_period
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* parameters are measured in bytes, with one byte meaning the time
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* duration associated with the transmission of one byte on the
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* physical medium of the output port, with pipe or pipe traffic class
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* rate (measured as percentage of output port rate) determined as
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* credits_per_period divided by period. One credit represents one
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* byte.
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*/
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struct rte_sched_pipe_params {
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/* Pipe token bucket */
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uint32_t tb_rate; /**< Rate (measured in bytes per second) */
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uint32_t tb_size; /**< Size (measured in credits) */
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/* Pipe traffic classes */
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uint32_t tc_rate[RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE];
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/**< Traffic class rates (measured in bytes per second) */
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uint32_t tc_period;
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/**< Enforcement period (measured in milliseconds) */
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#ifdef RTE_SCHED_SUBPORT_TC_OV
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uint8_t tc_ov_weight; /**< Weight Traffic class 3 oversubscription */
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#endif
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/* Pipe queues */
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uint8_t wrr_weights[RTE_SCHED_QUEUES_PER_PIPE]; /**< WRR weights */
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};
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/** Queue statistics */
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struct rte_sched_queue_stats {
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/* Packets */
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uint32_t n_pkts; /**< Packets successfully written */
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uint32_t n_pkts_dropped; /**< Packets dropped */
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#ifdef RTE_SCHED_RED
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uint32_t n_pkts_red_dropped; /**< Packets dropped by RED */
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#endif
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/* Bytes */
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uint32_t n_bytes; /**< Bytes successfully written */
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uint32_t n_bytes_dropped; /**< Bytes dropped */
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};
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/** Port configuration parameters. */
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struct rte_sched_port_params {
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const char *name; /**< String to be associated */
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int socket; /**< CPU socket ID */
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uint32_t rate; /**< Output port rate
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* (measured in bytes per second) */
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uint32_t mtu; /**< Maximum Ethernet frame size
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* (measured in bytes).
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* Should not include the framing overhead. */
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uint32_t frame_overhead; /**< Framing overhead per packet
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* (measured in bytes) */
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uint32_t n_subports_per_port; /**< Number of subports */
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uint32_t n_pipes_per_subport; /**< Number of pipes per subport */
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uint16_t qsize[RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE];
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/**< Packet queue size for each traffic class.
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* All queues within the same pipe traffic class have the same
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* size. Queues from different pipes serving the same traffic
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* class have the same size. */
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struct rte_sched_pipe_params *pipe_profiles;
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/**< Pipe profile table.
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* Every pipe is configured using one of the profiles from this table. */
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uint32_t n_pipe_profiles; /**< Profiles in the pipe profile table */
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#ifdef RTE_SCHED_RED
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struct rte_red_params red_params[RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE][e_RTE_METER_COLORS]; /**< RED parameters */
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#endif
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};
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/*
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* Configuration
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*
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***/
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/**
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* Hierarchical scheduler port configuration
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*
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* @param params
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* Port scheduler configuration parameter structure
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* @return
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* Handle to port scheduler instance upon success or NULL otherwise.
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*/
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struct rte_sched_port *
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rte_sched_port_config(struct rte_sched_port_params *params);
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/**
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* Hierarchical scheduler port free
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*
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* @param port
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* Handle to port scheduler instance
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*/
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void
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rte_sched_port_free(struct rte_sched_port *port);
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/**
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* Hierarchical scheduler subport configuration
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*
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* @param port
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* Handle to port scheduler instance
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* @param subport_id
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* Subport ID
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* @param params
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* Subport configuration parameters
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* @return
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* 0 upon success, error code otherwise
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*/
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int
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rte_sched_subport_config(struct rte_sched_port *port,
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uint32_t subport_id,
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struct rte_sched_subport_params *params);
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/**
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* Hierarchical scheduler pipe configuration
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*
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* @param port
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* Handle to port scheduler instance
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* @param subport_id
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* Subport ID
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* @param pipe_id
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* Pipe ID within subport
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* @param pipe_profile
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* ID of port-level pre-configured pipe profile
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* @return
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* 0 upon success, error code otherwise
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*/
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int
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rte_sched_pipe_config(struct rte_sched_port *port,
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uint32_t subport_id,
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uint32_t pipe_id,
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int32_t pipe_profile);
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/**
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* Hierarchical scheduler memory footprint size per port
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*
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* @param params
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* Port scheduler configuration parameter structure
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* @return
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* Memory footprint size in bytes upon success, 0 otherwise
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*/
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uint32_t
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rte_sched_port_get_memory_footprint(struct rte_sched_port_params *params);
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/*
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* Statistics
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*
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***/
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/**
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* Hierarchical scheduler subport statistics read
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*
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* @param port
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* Handle to port scheduler instance
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* @param subport_id
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* Subport ID
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* @param stats
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* Pointer to pre-allocated subport statistics structure where the statistics
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* counters should be stored
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* @param tc_ov
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* Pointer to pre-allocated 4-entry array where the oversubscription status for
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* each of the 4 subport traffic classes should be stored.
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* @return
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* 0 upon success, error code otherwise
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*/
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int
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rte_sched_subport_read_stats(struct rte_sched_port *port,
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uint32_t subport_id,
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struct rte_sched_subport_stats *stats,
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uint32_t *tc_ov);
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/**
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* Hierarchical scheduler queue statistics read
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*
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* @param port
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* Handle to port scheduler instance
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* @param queue_id
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* Queue ID within port scheduler
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* @param stats
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* Pointer to pre-allocated subport statistics structure where the statistics
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* counters should be stored
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* @param qlen
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* Pointer to pre-allocated variable where the current queue length
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* should be stored.
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* @return
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* 0 upon success, error code otherwise
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*/
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int
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rte_sched_queue_read_stats(struct rte_sched_port *port,
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uint32_t queue_id,
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struct rte_sched_queue_stats *stats,
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uint16_t *qlen);
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/**
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* Scheduler hierarchy path write to packet descriptor. Typically
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* called by the packet classification stage.
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*
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* @param pkt
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* Packet descriptor handle
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* @param subport
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* Subport ID
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* @param pipe
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* Pipe ID within subport
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* @param traffic_class
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* Traffic class ID within pipe (0 .. 3)
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* @param queue
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* Queue ID within pipe traffic class (0 .. 3)
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* @param color
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* Packet color set
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*/
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void
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rte_sched_port_pkt_write(struct rte_mbuf *pkt,
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uint32_t subport, uint32_t pipe, uint32_t traffic_class,
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uint32_t queue, enum rte_meter_color color);
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/**
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* Scheduler hierarchy path read from packet descriptor (struct
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* rte_mbuf). Typically called as part of the hierarchical scheduler
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* enqueue operation. The subport, pipe, traffic class and queue
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* parameters need to be pre-allocated by the caller.
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*
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* @param pkt
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* Packet descriptor handle
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* @param subport
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* Subport ID
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* @param pipe
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* Pipe ID within subport
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* @param traffic_class
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* Traffic class ID within pipe (0 .. 3)
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* @param queue
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* Queue ID within pipe traffic class (0 .. 3)
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*
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*/
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void
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rte_sched_port_pkt_read_tree_path(const struct rte_mbuf *pkt,
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uint32_t *subport, uint32_t *pipe,
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uint32_t *traffic_class, uint32_t *queue);
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enum rte_meter_color
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rte_sched_port_pkt_read_color(const struct rte_mbuf *pkt);
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/**
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* Hierarchical scheduler port enqueue. Writes up to n_pkts to port
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* scheduler and returns the number of packets actually written. For
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* each packet, the port scheduler queue to write the packet to is
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* identified by reading the hierarchy path from the packet
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* descriptor; if the queue is full or congested and the packet is not
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* written to the queue, then the packet is automatically dropped
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* without any action required from the caller.
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*
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* @param port
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* Handle to port scheduler instance
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* @param pkts
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* Array storing the packet descriptor handles
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* @param n_pkts
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* Number of packets to enqueue from the pkts array into the port scheduler
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* @return
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* Number of packets successfully enqueued
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*/
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int
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rte_sched_port_enqueue(struct rte_sched_port *port, struct rte_mbuf **pkts, uint32_t n_pkts);
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/**
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* Hierarchical scheduler port dequeue. Reads up to n_pkts from the
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* port scheduler and stores them in the pkts array and returns the
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* number of packets actually read. The pkts array needs to be
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* pre-allocated by the caller with at least n_pkts entries.
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*
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* @param port
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* Handle to port scheduler instance
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* @param pkts
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* Pre-allocated packet descriptor array where the packets dequeued
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* from the port
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* scheduler should be stored
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* @param n_pkts
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* Number of packets to dequeue from the port scheduler
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* @return
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* Number of packets successfully dequeued and placed in the pkts array
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*/
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int
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rte_sched_port_dequeue(struct rte_sched_port *port, struct rte_mbuf **pkts, uint32_t n_pkts);
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#ifdef __cplusplus
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}
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#endif
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#endif /* __INCLUDE_RTE_SCHED_H__ */
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