Re: [dpdk-dev] [PATCH] xenvirt: fix compilation after mempool changes

[Christian Ehrhardt <christian.ehrhardt@canonical.com>]

Hi Oliver,
thanks for the fast response!

It fixes the compilation issue and I totally agree to your argument of the
multi-chunk issues being out of scope for this as they never worked.
Unfortunately I lack an environment to actually test this in real-life if
we need any more follow up than this.

Acked-by: Christian Ehrhardt <christian.ehrhardt@canonical.com>



Christian Ehrhardt
Software Engineer, Ubuntu Server
Canonical Ltd

On Mon, Jun 13, 2016 at 10:22 AM, Olivier Matz <olivier.matz@6wind.com>
wrote:

> The field elt_va_start has been removed from the mempool structure,
> and it was not replaced in xenvirt.
>
> Fix this by getting the mempool objects address by using the address of
> the first memory chunk list.
>
> Note that it won't work with mempool composed of several chunks,
> but it was already the case before.
>
> Fixes: 84121f197187 ("mempool: store memory chunks in a list")
> Reported-by: Christian Ehrhard <christian.ehrhardt@canonical.com>
> Signed-off-by: Olivier Matz <olivier.matz@6wind.com>
> ---
>  drivers/net/xenvirt/rte_xen_lib.c | 10 +++++++++-
>  1 file changed, 9 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/xenvirt/rte_xen_lib.c
> b/drivers/net/xenvirt/rte_xen_lib.c
> index de63cd3..997e56e 100644
> --- a/drivers/net/xenvirt/rte_xen_lib.c
> +++ b/drivers/net/xenvirt/rte_xen_lib.c
> @@ -423,6 +423,7 @@ grant_gntalloc_mbuf_pool(struct rte_mempool *mpool,
> uint32_t pg_num, uint32_t *g
>  {
>         char key_str[PATH_MAX] = {0};
>         char val_str[PATH_MAX] = {0};
> +       void *mempool_obj_va;
>
>         if (grant_node_create(pg_num, gref_arr, pa_arr, val_str,
> sizeof(val_str))) {
>                 return -1;
> @@ -437,7 +438,14 @@ grant_gntalloc_mbuf_pool(struct rte_mempool *mpool,
> uint32_t pg_num, uint32_t *g
>         if (snprintf(key_str, sizeof(key_str),
>                 DPDK_XENSTORE_PATH"%d"MEMPOOL_VA_XENSTORE_STR,
> mempool_idx) == -1)
>                 return -1;
> -       if (snprintf(val_str, sizeof(val_str), "%"PRIxPTR,
> (uintptr_t)mpool->elt_va_start) == -1)
> +       if (mp->nb_mem_chunks != 1) {
> +               RTE_LOG(ERR, PMD,
> +                       "mempool with more than 1 chunk is not
> supported\n");
> +               return -1;
> +       }
> +       mempool_obj_va = STAILQ_FIRST(&mp->mem_list)->addr;
> +       if (snprintf(val_str, sizeof(val_str), "%"PRIxPTR,
> +                       (uintptr_t)mempool_obj_va) == -1)
>                 return -1;
>         if (xenstore_write(key_str, val_str) == -1)
>                 return -1;
> --
> 2.8.0.rc3
>
>