Re: [dpdk-dev] [PATCH v2 3/6] app/test: add basic dmadev copy tests

[Jerin Jacob <jerinjacobk@gmail.com>]

On Wed, Sep 1, 2021 at 10:02 PM Bruce Richardson
<bruce.richardson@intel.com> wrote:
>
> For each dmadev instance, perform some basic copy tests to validate that
> functionality.
>
> Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
> ---
>  app/test/test_dmadev.c | 174 +++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 174 insertions(+)
>
> diff --git a/app/test/test_dmadev.c b/app/test/test_dmadev.c
> index 12f7c69629..261f45db71 100644
> --- a/app/test/test_dmadev.c
> +++ b/app/test/test_dmadev.c
> @@ -2,12 +2,15 @@
>   * Copyright(c) 2021 HiSilicon Limited.
>   * Copyright(c) 2021 Intel Corporation.
>   */
> +#include <unistd.h>
>  #include <inttypes.h>
>
>  #include <rte_common.h>
>  #include <rte_dev.h>
>  #include <rte_dmadev.h>
>  #include <rte_bus_vdev.h>
> +#include <rte_mbuf.h>
> +#include <rte_random.h>
>
>  #include "test.h"
>
> @@ -16,6 +19,11 @@ extern int test_dmadev_api(uint16_t dev_id);
>
>  #define PRINT_ERR(...) print_err(__func__, __LINE__, __VA_ARGS__)
>
> +#define COPY_LEN 1024
> +
> +static struct rte_mempool *pool;
> +static uint16_t id_count;
> +
>  static inline int
>  __rte_format_printf(3, 4)
>  print_err(const char *func, int lineno, const char *format, ...)
> @@ -31,6 +39,134 @@ print_err(const char *func, int lineno, const char *format, ...)
>         return ret;
>  }
>
> +static inline void
> +await_hw(int dev_id, uint16_t vchan)
> +{
> +       int idle = rte_dmadev_vchan_idle(dev_id, vchan);
> +       if (idle < 0) {
> +               /* for drivers that don't support this op, just sleep for 25 microseconds */
> +               usleep(25);
> +               return;
> +       }

Can following model eliminate the need for rte_dmadev_vchan_idle() API. Right?

static inline bool
await_hw(int dev_id, uint16_t vchan, uint16_t  nb_req, uint16_t *last_idx)
{
             const uint64_t tmo =   rte_get_timer_hz();
             bool has_error  = false;

             const uint64_t end_cycles = rte_get_timer_cycles() + tmo;
              while (rte_get_timer_cycles() < end_cycles && nb_req > 0
&& has_error  == false) {
                           rte_pause();
                           nb_req -= rte_dmadev_completed(dev_id,
nb_req, last_idx, &has_error);
              }

              return has_error ;
}



> +
> +       /* for those that do, *max* end time is one second from now, but all should be faster */
> +       const uint64_t end_cycles = rte_get_timer_cycles() + rte_get_timer_hz();
> +       while (!idle && rte_get_timer_cycles() < end_cycles) {
> +               rte_pause();
> +               idle = rte_dmadev_vchan_idle(dev_id, vchan);
> +       }
> +}