On 1/26/21 7:36 AM, Xia, Chenbo wrote:
> Hi Maxime,
>
>> -----Original Message-----
>> From: Maxime Coquelin <maxime.coque...@redhat.com>
>> Sent: Tuesday, January 26, 2021 1:15 AM
>> To: dev@dpdk.org; Xia, Chenbo <chenbo....@intel.com>; olivier.m...@6wind.com;
>> amore...@redhat.com; david.march...@redhat.com
>> Cc: Maxime Coquelin <maxime.coque...@redhat.com>
>> Subject: [PATCH v3 44/44] net/virtio: handle Virtio-user setup failure
>> properly
>>
>> This patch fixes virtio_user_dev_setup() error path,
>> by cleaning all resources it allocates. It introduces
>> virtio_user_dev_uninit_notify() that cleans all open
>> FDs. It implies assigning all FDs to -1 at init time.
>>
>> With these changes done, virtio_user_dev_init_notify()
>> can be simplified.
>>
>> Suggested-by: Adrian Moreno <amore...@redhat.com>
>> Signed-off-by: Maxime Coquelin <maxime.coque...@redhat.com>
>> ---
>> .../net/virtio/virtio_user/virtio_user_dev.c | 68 +++++++++++++------
>> 1 file changed, 47 insertions(+), 21 deletions(-)
>>
>> diff --git a/drivers/net/virtio/virtio_user/virtio_user_dev.c
>> b/drivers/net/virtio/virtio_user/virtio_user_dev.c
>> index a1e32158bb..7c60022a26 100644
>> --- a/drivers/net/virtio/virtio_user/virtio_user_dev.c
>> +++ b/drivers/net/virtio/virtio_user/virtio_user_dev.c
>> @@ -283,13 +283,7 @@ virtio_user_dev_init_notify(struct virtio_user_dev *dev)
>> int callfd;
>> int kickfd;
>>
>> - for (i = 0; i < VIRTIO_MAX_VIRTQUEUES; ++i) {
>> - if (i >= dev->max_queue_pairs * 2) {
>> - dev->kickfds[i] = -1;
>> - dev->callfds[i] = -1;
>> - continue;
>> - }
>> -
>> + for (i = 0; i < dev->max_queue_pairs * 2; i++) {
>> /* May use invalid flag, but some backend uses kickfd and
>> * callfd as criteria to judge if dev is alive. so finally we
>> * use real event_fd.
>> @@ -297,25 +291,48 @@ virtio_user_dev_init_notify(struct virtio_user_dev
>> *dev)
>> callfd = eventfd(0, EFD_CLOEXEC | EFD_NONBLOCK);
>> if (callfd < 0) {
>> PMD_DRV_LOG(ERR, "(%s) callfd error, %s", dev->path,
>> strerror(errno));
>> - break;
>> + goto err;
>> }
>> kickfd = eventfd(0, EFD_CLOEXEC | EFD_NONBLOCK);
>> if (kickfd < 0) {
>> close(callfd);
>> PMD_DRV_LOG(ERR, "(%s) kickfd error, %s", dev->path,
>> strerror(errno));
>> - break;
>> + goto err;
>> }
>> dev->callfds[i] = callfd;
>> dev->kickfds[i] = kickfd;
>> }
>>
>> - if (i < VIRTIO_MAX_VIRTQUEUES) {
>> - for (j = 0; j < i; ++j) {
>> - close(dev->callfds[j]);
>> + return 0;
>> +err:
>> + for (j = 0; j < i; j++) {
>> + if (dev->kickfds[j] >= 0) {
>> close(dev->kickfds[j]);
>> + dev->kickfds[j] = -1;
>> }
>> + if (dev->callfds[j] >= 0) {
>> + close(dev->callfds[j]);
>> + dev->callfds[j] = -1;
>> + }
>> + }
>>
>> - return -1;
>> + return -1;
>> +}
>> +
>> +static int
>
> Use void?
yes.
>> +virtio_user_dev_uninit_notify(struct virtio_user_dev *dev)
>> +{
>> + uint32_t i;
>> +
>> + for (i = 0; i < VIRTIO_MAX_VIRTQUEUES; ++i) {
>
> Do we need to loop for VIRTIO_MAX_VIRTQUEUES? Kick/call fds would only be set
> valid in virtio_user_dev_init_notify, and since virtio_user_dev_init_notify
> only
> loop for dev->max_queue_pairs * 2, this function will also loop for
> dev->max_queue_pairs * 2?
> Other fds should be -1, right?
Yes, given max_queue_pairs is never updated during the lifecycle, it is
safe to loop for max_queue_pairs.
I'll fix it in v4.
Thanks,
Maxime
> Thanks,
> Chenbo
>
>> + if (dev->kickfds[i] >= 0) {
>> + close(dev->kickfds[i]);
>> + dev->kickfds[i] = -1;
>> + }
>> + if (dev->callfds[i] >= 0) {
>> + close(dev->callfds[i]);
>> + dev->callfds[i] = -1;
>> + }
>> }
>>
>> return 0;
>> @@ -427,15 +444,22 @@ virtio_user_dev_setup(struct virtio_user_dev *dev)
>>
>> if (virtio_user_dev_init_notify(dev) < 0) {
>> PMD_INIT_LOG(ERR, "(%s) Failed to init notifiers\n", dev->path);
>> - return -1;
>> + goto destroy;
>> }
>>
>> if (virtio_user_fill_intr_handle(dev) < 0) {
>> PMD_INIT_LOG(ERR, "(%s) Failed to init interrupt handler\n",
>> dev-
>>> path);
>> - return -1;
>> + goto uninit;
>> }
>>
>> return 0;
>> +
>> +uninit:
>> + virtio_user_dev_uninit_notify(dev);
>> +destroy:
>> + dev->ops->destroy(dev);
>> +
>> + return -1;
>> }
>>
>> /* Use below macro to filter features from vhost backend */
>> @@ -466,9 +490,16 @@ virtio_user_dev_init(struct virtio_user_dev *dev, char
>> *path, int queues,
>> enum virtio_user_backend_type backend_type)
>> {
>> uint64_t backend_features;
>> + int i;
>>
>> pthread_mutex_init(&dev->mutex, NULL);
>> strlcpy(dev->path, path, PATH_MAX);
>> +
>> + for (i = 0; i < VIRTIO_MAX_VIRTQUEUES; i++) {
>> + dev->kickfds[i] = -1;
>> + dev->callfds[i] = -1;
>> + }
>> +
>> dev->started = 0;
>> dev->max_queue_pairs = queues;
>> dev->queue_pairs = 1; /* mq disabled by default */
>> @@ -565,16 +596,11 @@ virtio_user_dev_init(struct virtio_user_dev *dev, char
>> *path, int queues,
>> void
>> virtio_user_dev_uninit(struct virtio_user_dev *dev)
>> {
>> - uint32_t i;
>> -
>> virtio_user_stop_device(dev);
>>
>> rte_mem_event_callback_unregister(VIRTIO_USER_MEM_EVENT_CLB_NAME, dev);
>>
>> - for (i = 0; i < dev->max_queue_pairs * 2; ++i) {
>> - close(dev->callfds[i]);
>> - close(dev->kickfds[i]);
>> - }
>> + virtio_user_dev_uninit_notify(dev);
>>
>> free(dev->ifname);
>>
>> --
>> 2.29.2
>
