[DTrace-devel] [PATCH 35/61] Implement dt_bpf_map_next_key()

[Kris Van Hees]

On Fri, Jul 08, 2022 at 10:45:19AM -0400, eugene.loh--- via DTrace-devel wrote:
> From: Eugene Loh <eugene.loh at oracle.com>
> 
> Signed-off-by: Eugene Loh <eugene.loh at oracle.com>

Reviewed-by: Kris Van Hees <kris.van.hees at oracle.com>

... queued for dev

> ---
>  libdtrace/dt_bpf.c | 15 +++++++++++++++
>  libdtrace/dt_bpf.h |  1 +
>  2 files changed, 16 insertions(+)
> 
> diff --git a/libdtrace/dt_bpf.c b/libdtrace/dt_bpf.c
> index f0d1a99e..8a5149d4 100644
> --- a/libdtrace/dt_bpf.c
> +++ b/libdtrace/dt_bpf.c
> @@ -87,6 +87,21 @@ int dt_bpf_map_lookup(int fd, const void *key, void *val)
>  	return bpf(BPF_MAP_LOOKUP_ELEM, &attr);
>  }
>  
> +/*
> + * Find the next key after the given key in the map referenced by the given fd.
> + */
> +int dt_bpf_map_next_key(int fd, const void *key, void *nxt)
> +{
> +	union bpf_attr attr;
> +
> +	memset(&attr, 0, sizeof(attr));
> +	attr.map_fd = fd;
> +	attr.key = (uint64_t)(unsigned long)key;
> +	attr.next_key = (uint64_t)(unsigned long)nxt;
> +
> +	return bpf(BPF_MAP_GET_NEXT_KEY, &attr);
> +}
> +
>  /*
>   * Delete the given key from the map referenced by the given fd.
>   */
> diff --git a/libdtrace/dt_bpf.h b/libdtrace/dt_bpf.h
> index 40cbcf43..edf9c5d7 100644
> --- a/libdtrace/dt_bpf.h
> +++ b/libdtrace/dt_bpf.h
> @@ -44,6 +44,7 @@ extern int bpf(enum bpf_cmd cmd, union bpf_attr *attr);
>  
>  extern int dt_bpf_gmap_create(struct dtrace_hdl *);
>  extern int dt_bpf_map_lookup(int fd, const void *key, void *val);
> +extern int dt_bpf_map_next_key(int fd, const void *key, void *nxt);
>  extern int dt_bpf_map_update(int fd, const void *key, const void *val);
>  extern int dt_bpf_map_delete(int fd, const void *key);
>  extern int dt_bpf_func_id_in_range(int func_id);
> -- 
> 2.18.4
> 
> 
> _______________________________________________
> DTrace-devel mailing list
> DTrace-devel at oss.oracle.com
> https://oss.oracle.com/mailman/listinfo/dtrace-devel