[ovs-dev] [PATCH 2/2] netdev-dpdk: Add debug appctl to get mempool information.

Raymond Burkholder ray at oneunified.net
Tue Oct 31 11:41:03 UTC 2017


> 
> New appctl 'netdev-dpdk/get-mempool-info' implemented to get result of
> 'rte_mempool_list_dump()' function if no arguments passed and
> 'rte_mempool_dump()' if DPDK netdev passed as argument.
> 
> Could be used for debugging mbuf leaks and other mempool related issues.
> Most useful in pair with `grep -v "cache_count.*=0"`.

Pardon my ignorance, but do commands like these get put into the
documentation, command-line help at some point?

Looks like I should peruse source code and commits for other interesting
commands.



> 
> Signed-off-by: Ilya Maximets <i.maximets at samsung.com>
> ---
>  lib/netdev-dpdk.c | 54
> ++++++++++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 54 insertions(+)
> 
> diff --git a/lib/netdev-dpdk.c b/lib/netdev-dpdk.c index 4ec536d..0e4a08c
> 100644
> --- a/lib/netdev-dpdk.c
> +++ b/lib/netdev-dpdk.c
> @@ -2550,6 +2550,56 @@ error:
>      free(response);
>  }
> 
> +static void
> +netdev_dpdk_get_mempool_info(struct unixctl_conn *conn,
> +                             int argc, const char *argv[],
> +                             void *aux OVS_UNUSED) {
> +    size_t size;
> +    FILE *stream;
> +    char *response = NULL;
> +    struct netdev *netdev = NULL;
> +
> +    if (argc == 2) {
> +        netdev = netdev_from_name(argv[1]);
> +        if (!netdev || !is_dpdk_class(netdev->netdev_class)) {
> +            unixctl_command_reply_error(conn, "Not a DPDK Interface");
> +            goto out;
> +        }
> +    }
> +
> +    stream = open_memstream(&response, &size);
> +    if (!stream) {
> +        response = xasprintf("Unable to open memstream: %s.",
> +                             ovs_strerror(errno));
> +        unixctl_command_reply_error(conn, response);
> +        goto out;
> +    }
> +
> +    if (netdev) {
> +        struct netdev_dpdk *dev = netdev_dpdk_cast(netdev);
> +
> +        ovs_mutex_lock(&dev->mutex);
> +        ovs_mutex_lock(&dpdk_mp_mutex);
> +
> +        rte_mempool_dump(stream, dev->mp);
> +
> +        ovs_mutex_unlock(&dpdk_mp_mutex);
> +        ovs_mutex_unlock(&dev->mutex);
> +    } else {
> +        ovs_mutex_lock(&dpdk_mp_mutex);
> +        rte_mempool_list_dump(stream);
> +        ovs_mutex_unlock(&dpdk_mp_mutex);
> +    }
> +
> +    fclose(stream);
> +
> +    unixctl_command_reply(conn, response);
> +out:
> +    free(response);
> +    netdev_close(netdev);
> +}
> +
>  /*
>   * Set virtqueue flags so that we do not receive interrupts.
>   */
> @@ -2806,6 +2856,10 @@ netdev_dpdk_class_init(void)
>                                   "pci address of device", 1, 1,
>                                   netdev_dpdk_detach, NULL);
> 
> +        unixctl_command_register("netdev-dpdk/get-mempool-info",
> +                                 "[netdev]", 0, 1,
> +                                 netdev_dpdk_get_mempool_info, NULL);
> +
>          ovsthread_once_done(&once);
>      }
> 
> --
> 2.7.4


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