[v9,6/6] lib/eventdev: use custom element size ring for event rings

  Use custom element size ring APIs to replace event ring
implementation. This avoids code duplication.

Signed-off-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
Reviewed-by: Gavin Hu <gavin.hu@arm.com>
Reviewed-by: Ola Liljedahl <ola.liljedahl@arm.com>
---
 lib/librte_eventdev/rte_event_ring.c | 147 ++-------------------------
 lib/librte_eventdev/rte_event_ring.h |  45 ++++----
 2 files changed, 24 insertions(+), 168 deletions(-)
  

On Thu, Jan 16, 2020 at 10:56 AM Honnappa Nagarahalli
<honnappa.nagarahalli@arm.com> wrote:
>
> Use custom element size ring APIs to replace event ring
> implementation. This avoids code duplication.
>
> Signed-off-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
> Reviewed-by: Gavin Hu <gavin.hu@arm.com>
> Reviewed-by: Ola Liljedahl <ola.liljedahl@arm.com>

Please change the subject to eventdev: xxxxxx.

With the above change, LGTM

Reviewed-by: Jerin Jacob <jerinj@marvell.com>

> ---
>  lib/librte_eventdev/rte_event_ring.c | 147 ++-------------------------
>  lib/librte_eventdev/rte_event_ring.h |  45 ++++----
>  2 files changed, 24 insertions(+), 168 deletions(-)
>
> diff --git a/lib/librte_eventdev/rte_event_ring.c b/lib/librte_eventdev/rte_event_ring.c
> index 50190de01..d27e23901 100644
> --- a/lib/librte_eventdev/rte_event_ring.c
> +++ b/lib/librte_eventdev/rte_event_ring.c
> @@ -1,5 +1,6 @@
>  /* SPDX-License-Identifier: BSD-3-Clause
>   * Copyright(c) 2017 Intel Corporation
> + * Copyright(c) 2019 Arm Limited
>   */
>
>  #include <sys/queue.h>
> @@ -11,13 +12,6 @@
>  #include <rte_eal_memconfig.h>
>  #include "rte_event_ring.h"
>
> -TAILQ_HEAD(rte_event_ring_list, rte_tailq_entry);
> -
> -static struct rte_tailq_elem rte_event_ring_tailq = {
> -       .name = RTE_TAILQ_EVENT_RING_NAME,
> -};
> -EAL_REGISTER_TAILQ(rte_event_ring_tailq)
> -
>  int
>  rte_event_ring_init(struct rte_event_ring *r, const char *name,
>         unsigned int count, unsigned int flags)
> @@ -35,150 +29,21 @@ struct rte_event_ring *
>  rte_event_ring_create(const char *name, unsigned int count, int socket_id,
>                 unsigned int flags)
>  {
> -       char mz_name[RTE_MEMZONE_NAMESIZE];
> -       struct rte_event_ring *r;
> -       struct rte_tailq_entry *te;
> -       const struct rte_memzone *mz;
> -       ssize_t ring_size;
> -       int mz_flags = 0;
> -       struct rte_event_ring_list *ring_list = NULL;
> -       const unsigned int requested_count = count;
> -       int ret;
> -
> -       ring_list = RTE_TAILQ_CAST(rte_event_ring_tailq.head,
> -               rte_event_ring_list);
> -
> -       /* for an exact size ring, round up from count to a power of two */
> -       if (flags & RING_F_EXACT_SZ)
> -               count = rte_align32pow2(count + 1);
> -       else if (!rte_is_power_of_2(count)) {
> -               rte_errno = EINVAL;
> -               return NULL;
> -       }
> -
> -       ring_size = sizeof(*r) + (count * sizeof(struct rte_event));
> -
> -       ret = snprintf(mz_name, sizeof(mz_name), "%s%s",
> -               RTE_RING_MZ_PREFIX, name);
> -       if (ret < 0 || ret >= (int)sizeof(mz_name)) {
> -               rte_errno = ENAMETOOLONG;
> -               return NULL;
> -       }
> -
> -       te = rte_zmalloc("RING_TAILQ_ENTRY", sizeof(*te), 0);
> -       if (te == NULL) {
> -               RTE_LOG(ERR, RING, "Cannot reserve memory for tailq\n");
> -               rte_errno = ENOMEM;
> -               return NULL;
> -       }
> -
> -       rte_mcfg_tailq_write_lock();
> -
> -       /*
> -        * reserve a memory zone for this ring. If we can't get rte_config or
> -        * we are secondary process, the memzone_reserve function will set
> -        * rte_errno for us appropriately - hence no check in this this function
> -        */
> -       mz = rte_memzone_reserve(mz_name, ring_size, socket_id, mz_flags);
> -       if (mz != NULL) {
> -               r = mz->addr;
> -               /* Check return value in case rte_ring_init() fails on size */
> -               int err = rte_event_ring_init(r, name, requested_count, flags);
> -               if (err) {
> -                       RTE_LOG(ERR, RING, "Ring init failed\n");
> -                       if (rte_memzone_free(mz) != 0)
> -                               RTE_LOG(ERR, RING, "Cannot free memzone\n");
> -                       rte_free(te);
> -                       rte_mcfg_tailq_write_unlock();
> -                       return NULL;
> -               }
> -
> -               te->data = (void *) r;
> -               r->r.memzone = mz;
> -
> -               TAILQ_INSERT_TAIL(ring_list, te, next);
> -       } else {
> -               r = NULL;
> -               RTE_LOG(ERR, RING, "Cannot reserve memory\n");
> -               rte_free(te);
> -       }
> -       rte_mcfg_tailq_write_unlock();
> -
> -       return r;
> +       return (struct rte_event_ring *)rte_ring_create_elem(name,
> +                                               sizeof(struct rte_event),
> +                                               count, socket_id, flags);
>  }
>
>
>  struct rte_event_ring *
>  rte_event_ring_lookup(const char *name)
>  {
> -       struct rte_tailq_entry *te;
> -       struct rte_event_ring *r = NULL;
> -       struct rte_event_ring_list *ring_list;
> -
> -       ring_list = RTE_TAILQ_CAST(rte_event_ring_tailq.head,
> -                       rte_event_ring_list);
> -
> -       rte_mcfg_tailq_read_lock();
> -
> -       TAILQ_FOREACH(te, ring_list, next) {
> -               r = (struct rte_event_ring *) te->data;
> -               if (strncmp(name, r->r.name, RTE_RING_NAMESIZE) == 0)
> -                       break;
> -       }
> -
> -       rte_mcfg_tailq_read_unlock();
> -
> -       if (te == NULL) {
> -               rte_errno = ENOENT;
> -               return NULL;
> -       }
> -
> -       return r;
> +       return (struct rte_event_ring *)rte_ring_lookup(name);
>  }
>
>  /* free the ring */
>  void
>  rte_event_ring_free(struct rte_event_ring *r)
>  {
> -       struct rte_event_ring_list *ring_list = NULL;
> -       struct rte_tailq_entry *te;
> -
> -       if (r == NULL)
> -               return;
> -
> -       /*
> -        * Ring was not created with rte_event_ring_create,
> -        * therefore, there is no memzone to free.
> -        */
> -       if (r->r.memzone == NULL) {
> -               RTE_LOG(ERR, RING,
> -                       "Cannot free ring (not created with rte_event_ring_create()");
> -               return;
> -       }
> -
> -       if (rte_memzone_free(r->r.memzone) != 0) {
> -               RTE_LOG(ERR, RING, "Cannot free memory\n");
> -               return;
> -       }
> -
> -       ring_list = RTE_TAILQ_CAST(rte_event_ring_tailq.head,
> -                       rte_event_ring_list);
> -       rte_mcfg_tailq_write_lock();
> -
> -       /* find out tailq entry */
> -       TAILQ_FOREACH(te, ring_list, next) {
> -               if (te->data == (void *) r)
> -                       break;
> -       }
> -
> -       if (te == NULL) {
> -               rte_mcfg_tailq_write_unlock();
> -               return;
> -       }
> -
> -       TAILQ_REMOVE(ring_list, te, next);
> -
> -       rte_mcfg_tailq_write_unlock();
> -
> -       rte_free(te);
> +       rte_ring_free((struct rte_ring *)r);
>  }
> diff --git a/lib/librte_eventdev/rte_event_ring.h b/lib/librte_eventdev/rte_event_ring.h
> index 827a3209e..c0861b0ec 100644
> --- a/lib/librte_eventdev/rte_event_ring.h
> +++ b/lib/librte_eventdev/rte_event_ring.h
> @@ -1,5 +1,6 @@
>  /* SPDX-License-Identifier: BSD-3-Clause
>   * Copyright(c) 2016-2017 Intel Corporation
> + * Copyright(c) 2019 Arm Limited
>   */
>
>  /**
> @@ -19,6 +20,7 @@
>  #include <rte_memory.h>
>  #include <rte_malloc.h>
>  #include <rte_ring.h>
> +#include <rte_ring_elem.h>
>  #include "rte_eventdev.h"
>
>  #define RTE_TAILQ_EVENT_RING_NAME "RTE_EVENT_RING"
> @@ -88,22 +90,17 @@ rte_event_ring_enqueue_burst(struct rte_event_ring *r,
>                 const struct rte_event *events,
>                 unsigned int n, uint16_t *free_space)
>  {
> -       uint32_t prod_head, prod_next;
> -       uint32_t free_entries;
> +       unsigned int num;
> +       uint32_t space;
>
> -       n = __rte_ring_move_prod_head(&r->r, r->r.prod.single, n,
> -                       RTE_RING_QUEUE_VARIABLE,
> -                       &prod_head, &prod_next, &free_entries);
> -       if (n == 0)
> -               goto end;
> +       num = rte_ring_enqueue_burst_elem(&r->r, events,
> +                               sizeof(struct rte_event), n,
> +                               &space);
>
> -       ENQUEUE_PTRS(&r->r, &r[1], prod_head, events, n, struct rte_event);
> -
> -       update_tail(&r->r.prod, prod_head, prod_next, r->r.prod.single, 1);
> -end:
>         if (free_space != NULL)
> -               *free_space = free_entries - n;
> -       return n;
> +               *free_space = space;
> +
> +       return num;
>  }
>
>  /**
> @@ -129,23 +126,17 @@ rte_event_ring_dequeue_burst(struct rte_event_ring *r,
>                 struct rte_event *events,
>                 unsigned int n, uint16_t *available)
>  {
> -       uint32_t cons_head, cons_next;
> -       uint32_t entries;
> -
> -       n = __rte_ring_move_cons_head(&r->r, r->r.cons.single, n,
> -                       RTE_RING_QUEUE_VARIABLE,
> -                       &cons_head, &cons_next, &entries);
> -       if (n == 0)
> -               goto end;
> +       unsigned int num;
> +       uint32_t remaining;
>
> -       DEQUEUE_PTRS(&r->r, &r[1], cons_head, events, n, struct rte_event);
> +       num = rte_ring_dequeue_burst_elem(&r->r, events,
> +                               sizeof(struct rte_event), n,
> +                               &remaining);
>
> -       update_tail(&r->r.cons, cons_head, cons_next, r->r.cons.single, 0);
> -
> -end:
>         if (available != NULL)
> -               *available = entries - n;
> -       return n;
> +               *available = remaining;
> +
> +       return num;
>  }
>
>  /*
> --
> 2.17.1
>
  

On Fri, Jan 17, 2020 at 3:42 PM Jerin Jacob <jerinjacobk@gmail.com> wrote:
>
> On Thu, Jan 16, 2020 at 10:56 AM Honnappa Nagarahalli
> <honnappa.nagarahalli@arm.com> wrote:
> >
> > Use custom element size ring APIs to replace event ring
> > implementation. This avoids code duplication.
> >
> > Signed-off-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
> > Reviewed-by: Gavin Hu <gavin.hu@arm.com>
> > Reviewed-by: Ola Liljedahl <ola.liljedahl@arm.com>
>
> Please change the subject to eventdev: xxxxxx.

I can do while applying.

>
> With the above change, LGTM
>
> Reviewed-by: Jerin Jacob <jerinj@marvell.com>

Thanks Jerin.


--
David Marchand