On 20/10/2020 10:11, Maxime Coquelin wrote: > > > On 10/20/20 11:01 AM, Kevin Traynor wrote: >> On 20/10/2020 08:16, Adrian Moreno wrote: >>> If stat fails it means the backend must be vhost-user in server mode >>> >>> Bugzilla ID: 559 >>> Fixes: f908b22ea47a ("net/virtio: move backend type selection to ethdev") >>> Cc: sta...@dpdk.org >>> >>> Signed-off-by: Adrian Moreno <amore...@redhat.com> >>> --- >>> drivers/net/virtio/virtio_user_ethdev.c | 5 +++-- >>> 1 file changed, 3 insertions(+), 2 deletions(-) >>> >>> diff --git a/drivers/net/virtio/virtio_user_ethdev.c >>> b/drivers/net/virtio/virtio_user_ethdev.c >>> index 042665bc0..ce74d08ab 100644 >>> --- a/drivers/net/virtio/virtio_user_ethdev.c >>> +++ b/drivers/net/virtio/virtio_user_ethdev.c >>> @@ -560,9 +560,10 @@ virtio_user_backend_type(const char *path) >>> struct stat sb; >>> >>> if (stat(path, &sb) == -1) { >>> - PMD_INIT_LOG(ERR, "Stat fails: %s (%s)\n", path, >>> + PMD_INIT_LOG(INFO, "Stat fails: %s (%s)\n", path, >>> strerror(errno)); >> >> It may be accurate, but a 'fail' in the logs can be confusing for users >> when it is an INFO log and normal operation. Suggest to reword to >> something softer like 'Unable to stat' or 'Not able to get file status' > > > We may want to: > - only return VIRTIO_USER_BACKEND_VHOST_USER if -ENOENT, and log that > we assume this is Vhost-user backend in server mode at INFO level.
It will mean that sometimes the backend type is logged and sometimes not, but maybe you make a distinction because there is an assumption being made in this case? > - return VIRTIO_USER_BACKEND_UNKNOWN otherwise and print an error > message with the strerror(errno). > yes, it seems better like that. > What do you think? > >>> - return VIRTIO_USER_BACKEND_UNKNOWN; >>> + /* Must be vhost-user in server mode */ >>> + return VIRTIO_USER_BACKEND_VHOST_USER; >>> } >>> >>> if (S_ISSOCK(sb.st_mode)) { >>> >>