Re: [dpdk-dev] [PATCH v5 06/11] sched: improve doxygen comments

["Dumitrescu, Cristian" <cristian.dumitrescu@intel.com>]

> -----Original Message-----
> From: Singh, Jasvinder
> Sent: Wednesday, July 17, 2019 4:43 PM
> To: dev@dpdk.org
> Cc: Dumitrescu, Cristian <cristian.dumitrescu@intel.com>; Tovar, AbrahamX
> <abrahamx.tovar@intel.com>; Krakowiak, LukaszX
> <lukaszx.krakowiak@intel.com>
> Subject: [PATCH v5 06/11] sched: improve doxygen comments
> 
> Improve doxygen comments.
> 
> Signed-off-by: Jasvinder Singh <jasvinder.singh@intel.com>
> Signed-off-by: Abraham Tovar <abrahamx.tovar@intel.com>
> Signed-off-by: Lukasz Krakowiak <lukaszx.krakowiak@intel.com>
> ---
>  lib/librte_sched/rte_sched.h | 151 +++++++++++++++++++++--------------
>  1 file changed, 93 insertions(+), 58 deletions(-)
> 
> diff --git a/lib/librte_sched/rte_sched.h b/lib/librte_sched/rte_sched.h
> index fb2688ff0..caf9fa406 100644
> --- a/lib/librte_sched/rte_sched.h
> +++ b/lib/librte_sched/rte_sched.h
> @@ -52,7 +52,7 @@ extern "C" {
>   *	    multiple connections of same traffic class belonging to
>   *	    the same user;
>   *           - Weighted Round Robin (WRR) is used to service the
> - *	    queues within same pipe traffic class.
> + *	    queues within same pipe lowest priority traffic class (best-effort).
>   *
>   */
> 
> @@ -83,7 +83,8 @@ extern "C" {
>  #define RTE_SCHED_BE_QUEUES_PER_PIPE    4
> 
>  /** Number of traffic classes per pipe (as well as subport).
> - * Cannot be changed.
> + * @see struct rte_sched_subport_params
> + * @see struct rte_sched_pipe_params
>   */
>  #define RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE    \
>  (RTE_SCHED_QUEUES_PER_PIPE - RTE_SCHED_BE_QUEUES_PER_PIPE + 1)
> @@ -109,6 +110,8 @@ extern "C" {
>   *
>   * The FCS is considered overhead only if not included in the packet
>   * length (field pkt_len of struct rte_mbuf).
> + *
> + * @see struct rte_sched_port_params
>   */
>  #ifndef RTE_SCHED_FRAME_OVERHEAD_DEFAULT
>  #define RTE_SCHED_FRAME_OVERHEAD_DEFAULT      24
> @@ -124,34 +127,36 @@ extern "C" {
>   * byte.
>   */
>  struct rte_sched_subport_params {
> -	/* Subport token bucket */
> -	uint32_t tb_rate;                /**< Rate (measured in bytes per second)
> */
> -	uint32_t tb_size;                /**< Size (measured in credits) */
> +	/** Token bucket rate (measured in bytes per second) */
> +	uint32_t tb_rate;
> +
> +	/** Token bucket size (measured in credits) */
> +	uint32_t tb_size;
> 
> -	/* Subport traffic classes */
> +	/** Traffic class rates (measured in bytes per second) */
>  	uint32_t tc_rate[RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE];
> -	/**< Traffic class rates (measured in bytes per second) */
> +
> +	/** Enforcement period for rates (measured in milliseconds) */
>  	uint32_t tc_period;
> -	/**< Enforcement period for rates (measured in milliseconds) */
>  };
> 
>  /** Subport statistics */
>  struct rte_sched_subport_stats {
> -	/* Packets */
> +	/** Number of packets successfully written */
>  	uint32_t n_pkts_tc[RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE];
> -	/**< Number of packets successfully written */
> +
> +	/** Number of packets dropped */
>  	uint32_t
> n_pkts_tc_dropped[RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE];
> -	/**< Number of packets dropped */
> 
> -	/* Bytes */
> +	/** Number of bytes successfully written for each traffic class */
>  	uint32_t n_bytes_tc[RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE];
> -	/**< Number of bytes successfully written for each traffic class */
> +
> +	/** Number of bytes dropped for each traffic class */
>  	uint32_t
> n_bytes_tc_dropped[RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE];
> -	/**< Number of bytes dropped for each traffic class */
> 
>  #ifdef RTE_SCHED_RED
> +	/** Number of packets dropped by red */
>  	uint32_t
> n_pkts_red_dropped[RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE];
> -	/**< Number of packets dropped by red */
>  #endif
>  };
> 
> @@ -165,61 +170,90 @@ struct rte_sched_subport_stats {
>   * byte.
>   */
>  struct rte_sched_pipe_params {
> -	/* Pipe token bucket */
> -	uint32_t tb_rate;                /**< Rate (measured in bytes per second)
> */
> -	uint32_t tb_size;                /**< Size (measured in credits) */
> +	/** Token bucket rate (measured in bytes per second) */
> +	uint32_t tb_rate;
> 
> -	/* Pipe traffic classes */
> +	/** Token bucket size (measured in credits) */
> +	uint32_t tb_size;
> +
> +	/** Traffic class rates (measured in bytes per second) */
>  	uint32_t tc_rate[RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE];
> -	/**< Traffic class rates (measured in bytes per second) */
> +
> +	/** Enforcement period (measured in milliseconds) */
>  	uint32_t tc_period;
> -	/**< Enforcement period (measured in milliseconds) */
> -	uint8_t tc_ov_weight;		 /**< Weight Traffic class 3
> oversubscription */
> 
> -	/* Pipe queues */
> -	uint8_t  wrr_weights[RTE_SCHED_BE_QUEUES_PER_PIPE]; /**<
> WRR weights */
> +	/** Best-effort traffic class oversubscription weight */
> +	uint8_t tc_ov_weight;
> +
> +	/** WRR weights of best-effort traffic class queues */
> +	uint8_t wrr_weights[RTE_SCHED_BE_QUEUES_PER_PIPE];
>  };
> 
>  /** Queue statistics */
>  struct rte_sched_queue_stats {
> -	/* Packets */
> -	uint32_t n_pkts;                 /**< Packets successfully written */
> -	uint32_t n_pkts_dropped;         /**< Packets dropped */
> +	/** Packets successfully written */
> +	uint32_t n_pkts;
> +
> +	/** Packets dropped */
> +	uint32_t n_pkts_dropped;
> +
>  #ifdef RTE_SCHED_RED
> -	uint32_t n_pkts_red_dropped;	 /**< Packets dropped by RED */
> +	/** Packets dropped by RED */
> +	uint32_t n_pkts_red_dropped;
>  #endif
> 
> -	/* Bytes */
> -	uint32_t n_bytes;                /**< Bytes successfully written */
> -	uint32_t n_bytes_dropped;        /**< Bytes dropped */
> +	/** Bytes successfully written */
> +	uint32_t n_bytes;
> +
> +	/** Bytes dropped */
> +	uint32_t n_bytes_dropped;
>  };
> 
>  /** Port configuration parameters. */
>  struct rte_sched_port_params {
> -	const char *name;                /**< String to be associated */
> -	int socket;                      /**< CPU socket ID */
> -	uint32_t rate;                   /**< Output port rate
> -					  * (measured in bytes per second) */
> -	uint32_t mtu;                    /**< Maximum Ethernet frame size
> -					  * (measured in bytes).
> -					  * Should not include the framing
> overhead. */
> -	uint32_t frame_overhead;         /**< Framing overhead per packet
> -					  * (measured in bytes) */
> -	uint32_t n_subports_per_port;    /**< Number of subports */
> -	uint32_t n_pipes_per_subport;    /**< Number of pipes per subport
> */
> +	/** Name of the port to be associated */
> +	const char *name;
> +
> +	/** CPU socket ID */
> +	int socket;
> +
> +	/** Output port rate (measured in bytes per second) */
> +	uint32_t rate;
> +
> +	/** Maximum Ethernet frame size (measured in bytes).
> +	 * Should not include the framing overhead.
> +	 */
> +	uint32_t mtu;
> +
> +	/** Framing overhead per packet (measured in bytes) */
> +	uint32_t frame_overhead;
> +
> +	/** Number of subports */
> +	uint32_t n_subports_per_port;
> +
> +	/** Number of subport_pipes */
> +	uint32_t n_pipes_per_subport;
> +
> +	/** Packet queue size for each traffic class.
> +	 * All the pipes within the same subport share the similar
> +	 * configuration for the queues.
> +	 */
>  	uint16_t qsize[RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE];
> -	/**< Packet queue size for each traffic class.
> -	 * All queues within the same pipe traffic class have the same
> -	 * size. Queues from different pipes serving the same traffic
> -	 * class have the same size. */
> +
> +	/** Pipe profile table.
> +	 * Every pipe is configured using one of the profiles from this table.
> +	 */
>  	struct rte_sched_pipe_params *pipe_profiles;
> -	/**< Pipe profile table.
> -	 * Every pipe is configured using one of the profiles from this table.
> */
> -	uint32_t n_pipe_profiles;        /**< Profiles in the pipe profile table */
> +
> +	/** Profiles in the pipe profile table */
> +	uint32_t n_pipe_profiles;
> +
> +	/** Max profiles allowed in the pipe profile table */
>  	uint32_t n_max_pipe_profiles;
> -	/**< Max profiles allowed in the pipe profile table */
> +
>  #ifdef RTE_SCHED_RED
> -	struct rte_red_params
> red_params[RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE][RTE_COLORS]; /**<
> RED parameters */
> +	/** RED parameters */
> +	struct rte_red_params
> red_params[RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE][RTE_COLORS];
>  #endif
>  };
> 
> @@ -333,8 +367,8 @@ rte_sched_port_get_memory_footprint(struct
> rte_sched_port_params *params);
>   *   Pointer to pre-allocated subport statistics structure where the statistics
>   *   counters should be stored
>   * @param tc_ov
> - *   Pointer to pre-allocated 4-entry array where the oversubscription status
> for
> - *   each of the 4 subport traffic classes should be stored.
> + *   Pointer to pre-allocated 13-entry array where the oversubscription

Please replace "13" by RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE.
I also suggest moving the definition of RTE_SCHED_TRAFFIC_CLASS_BE to this file.

> status for
> + *   each of the subport traffic classes should be stored.
>   * @return
>   *   0 upon success, error code otherwise
>   */
> @@ -379,9 +413,10 @@ rte_sched_queue_read_stats(struct rte_sched_port
> *port,
>   * @param pipe
>   *   Pipe ID within subport
>   * @param traffic_class
> - *   Traffic class ID within pipe (0 .. 3)
> + *   Traffic class ID within pipe (0 .. RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE
> - 1)
>   * @param queue
> - *   Queue ID within pipe traffic class (0 .. 3)
> + *   Queue ID within pipe traffic class, 0 for high priority TCs, and
> + *   0 .. (RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE-1) for best-effort TC

This should be: 0 .. (RTE_SCHED_BE_QUEUES_PER_PIPE - 1) for the Best Effort traffic class.

>   * @param color
>   *   Packet color set
>   */
> @@ -406,10 +441,10 @@ rte_sched_port_pkt_write(struct rte_sched_port
> *port,
>   * @param pipe
>   *   Pipe ID within subport
>   * @param traffic_class
> - *   Traffic class ID within pipe (0 .. 3)
> + *   Traffic class ID within pipe (0 ..
> RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE-1)
>   * @param queue
> - *   Queue ID within pipe traffic class (0 .. 3)
> - *
> + *   Queue ID within pipe traffic class, 0 for high priority TCs, and
> + *   0 .. (RTE_SCHED_TRAFFIC_CLASSES_PER_PIPE-1) for best-effort TC

This should be: 0 .. (RTE_SCHED_BE_QUEUES_PER_PIPE - 1) for the Best Effort traffic class.

>   */
>  void
>  rte_sched_port_pkt_read_tree_path(struct rte_sched_port *port,
> --
> 2.21.0