Hello,
On Mon, Mar 13, 2023 at 10:35 AM Volodymyr Fialko <vfia...@marvell.com> wrote:
>
> It's possible to initialize reorder buffer with user allocated memory via
> rte_reorder_init() function. In such case rte_reorder_create() not required
> and reorder dynamic field in rte_mbuf will be not registered.
Good catch.
>
> Fixes: 01f3496695b5 ("reorder: switch sequence number to dynamic mbuf field")
It seems worth backporting.
Cc: sta...@dpdk.org
>
> Signed-off-by: Volodymyr Fialko <vfia...@marvell.com>
> ---
> lib/reorder/rte_reorder.c | 40 ++++++++++++++++++++++++++++++---------
> 1 file changed, 31 insertions(+), 9 deletions(-)
>
> diff --git a/lib/reorder/rte_reorder.c b/lib/reorder/rte_reorder.c
> index 6e029c9e02..a759a9c434 100644
> --- a/lib/reorder/rte_reorder.c
> +++ b/lib/reorder/rte_reorder.c
> @@ -54,6 +54,28 @@ struct rte_reorder_buffer {
> static void
> rte_reorder_free_mbufs(struct rte_reorder_buffer *b);
>
> +static int
> +rte_reorder_dynf_register(void)
> +{
> + int ret;
> +
> + static const struct rte_mbuf_dynfield reorder_seqn_dynfield_desc = {
> + .name = RTE_REORDER_SEQN_DYNFIELD_NAME,
> + .size = sizeof(rte_reorder_seqn_t),
> + .align = __alignof__(rte_reorder_seqn_t),
> + };
> +
> + if (rte_reorder_seqn_dynfield_offset > 0)
> + return 0;
> +
> + ret = rte_mbuf_dynfield_register(&reorder_seqn_dynfield_desc);
> + if (ret < 0)
> + return ret;
> + rte_reorder_seqn_dynfield_offset = ret;
> +
> + return 0;
> +}
We don't need this helper (see my comment below, for
rte_reorder_create), you can simply move this block to
rte_reorder_init().
> +
> struct rte_reorder_buffer *
> rte_reorder_init(struct rte_reorder_buffer *b, unsigned int bufsize,
> const char *name, unsigned int size)
> @@ -85,6 +107,12 @@ rte_reorder_init(struct rte_reorder_buffer *b, unsigned
> int bufsize,
> rte_errno = EINVAL;
> return NULL;
> }
> + if (rte_reorder_dynf_register()) {
> + RTE_LOG(ERR, REORDER, "Failed to register mbuf field for
> reorder sequence"
> + " number\n");
> + rte_errno = ENOMEM;
I think returning this new errno code is fine from a ABI pov.
An application would have to check for NULL return code in any case
and can't act differently based on rte_errno value.
However, this is a small change to the rte_reorder_init API, so it
needs some update, see:
* @return
* The initialized reorder buffer instance, or NULL on error
* On error case, rte_errno will be set appropriately:
* - EINVAL - invalid parameters
> + return NULL;
> + }
>
> memset(b, 0, bufsize);
> strlcpy(b->name, name, sizeof(b->name));
> @@ -106,11 +134,6 @@ rte_reorder_create(const char *name, unsigned socket_id,
> unsigned int size)
> struct rte_reorder_list *reorder_list;
> const unsigned int bufsize = sizeof(struct rte_reorder_buffer) +
> (2 * size * sizeof(struct rte_mbuf
> *));
> - static const struct rte_mbuf_dynfield reorder_seqn_dynfield_desc = {
> - .name = RTE_REORDER_SEQN_DYNFIELD_NAME,
> - .size = sizeof(rte_reorder_seqn_t),
> - .align = __alignof__(rte_reorder_seqn_t),
> - };
>
> reorder_list = RTE_TAILQ_CAST(rte_reorder_tailq.head,
> rte_reorder_list);
>
> @@ -128,10 +151,9 @@ rte_reorder_create(const char *name, unsigned socket_id,
> unsigned int size)
> return NULL;
> }
>
> - rte_reorder_seqn_dynfield_offset =
> - rte_mbuf_dynfield_register(&reorder_seqn_dynfield_desc);
> - if (rte_reorder_seqn_dynfield_offset < 0) {
> - RTE_LOG(ERR, REORDER, "Failed to register mbuf field for
> reorder sequence number\n");
> + if (rte_reorder_dynf_register()) {
> + RTE_LOG(ERR, REORDER, "Failed to register mbuf field for
> reorder sequence"
> + " number\n");
All rte_reorder_buffer objects need to go through rte_reorder_init().
You can check rte_reorder_init() return code.
> rte_errno = ENOMEM;
> return NULL;
> }
> --
> 2.34.1
>
--
David Marchand
