Re: [PATCH 4/6] rte_sched: allow reading without clearing

[Thomas Monjalon <thomas.monjalon@6wind.com>]

2015-04-29 10:04, Stephen Hemminger:
> The rte_sched statistics API should allow reading statistics without
> clearing. Make auto-clear optional.
> 
> Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
> ---
>  app/test/test_sched.c        |  4 ++--
>  examples/qos_sched/stats.c   | 16 +++++++++++-----
>  lib/librte_sched/rte_sched.c | 44 ++++++++++++++++++++++----------------------
>  lib/librte_sched/rte_sched.h | 18 ++++++++++--------
[...]

This API change needs more adjustments in the example app:

examples/qos_sched/stats.c: In function ‘subport_stat’:
examples/qos_sched/stats.c:263:9: error: too few arguments to function ‘rte_sched_subport_read_stats’
         rte_sched_subport_read_stats(port, subport_id, &stats, tc_ov);
         ^
examples/qos_sched/stats.c: In function ‘pipe_stat’:
examples/qos_sched/stats.c:309:25: error: too few arguments to function ‘rte_sched_queue_read_stats’
                         rte_sched_queue_read_stats(port, queue_id + (i * RTE_SCHED_QUEUES_PER_TRAFFIC_CLASS + j), &stats, &qlen);
                         ^

[...]
> --- a/lib/librte_sched/rte_sched.h
> +++ b/lib/librte_sched/rte_sched.h
> @@ -308,14 +308,15 @@ rte_sched_port_get_memory_footprint(struct rte_sched_port_params *params);
>   * @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.
> + * @parm clear
> + *   Reset statistics after read
>   * @return
>   *   0 upon success, error code otherwise
>   */
>  int
> -rte_sched_subport_read_stats(struct rte_sched_port *port,
> -	uint32_t subport_id,
> -	struct rte_sched_subport_stats *stats,
> -	uint32_t *tc_ov);
> +rte_sched_subport_read_stats(struct rte_sched_port *port, uint32_t subport_id,
> +			     struct rte_sched_subport_stats *stats,
> +			     uint32_t *tc_ov, int clear);
>  
>  /**
>   * Hierarchical scheduler queue statistics read
> @@ -329,14 +330,15 @@ rte_sched_subport_read_stats(struct rte_sched_port *port,
>   *   counters should be stored
>   * @param qlen
>   *   Pointer to pre-allocated variable where the current queue length should be stored.
> + * @parm clear
> + *   Reset statistics after read
>   * @return
>   *   0 upon success, error code otherwise
>   */
>  int
> -rte_sched_queue_read_stats(struct rte_sched_port *port,
> -	uint32_t queue_id,
> -	struct rte_sched_queue_stats *stats,
> -	uint16_t *qlen);
> +rte_sched_queue_read_stats(struct rte_sched_port *port, uint32_t queue_id,
> +			   struct rte_sched_queue_stats *stats,
> +			   uint16_t *qlen, int clear);
>  
>  /*
>   * Run-time
> 

What about ABI versioning? compatibility?