[dpdk-dev] [PATCH v3 3/8] net/virtio: move backend type selection to ethdev

[Adrian Moreno]

Hi Yinan,

Still testing, but submitting for early review:
https://patches.dpdk.org/patch/81431/

Thanks,

On 10/20/20 9:11 AM, Maxime Coquelin wrote:
> Hi Yinan,
> 
> On 10/20/20 3:52 AM, Wang, Yinan wrote:
>> Hi Adrian/Maxime,
>>
>> Could you help to take a look at this issue? Most of automated regression cases will be blocked due to this issue in 20.11 RC1 test.
> 
> We are working on it. Adrian managed to reproduce it, and fixed one
> part of the issue. We''l continue the debugging today.
> 

> BTW, you are mentionning automated regression tests, any chances these
> test land in the Intel functionnal CI at some point? I would be great to
> catch these issues before the series are merged.
> 
> Thanks!
> Maxime
> 
>> Thanks in advance!
>>
>> BR,
>> Yinan
>>
>>> -----Original Message-----
>>> From: Wang, Yinan
>>> Sent: 2020?10?16? 13:42
>>> To: Maxime Coquelin <maxime.coquelin at redhat.com>; dev at dpdk.org; Xia,
>>> Chenbo <Chenbo.Xia at intel.com>; Fu, Patrick <patrick.fu at intel.com>;
>>> amorenoz at redhat.com
>>> Subject: RE: [dpdk-dev] [PATCH v3 3/8] net/virtio: move backend type selection
>>> to ethdev
>>>
>>> Hi Adrian,
>>>
>>> This patch introduce a regression issue that vhost-user can't launch with server
>>> mode, details in https://bugs.dpdk.org/show_bug.cgi?id=559.
>>> This issue blocked amount of regression cases, could you help to take a look?
>>> Thanks in advance!
>>>
>>>
>>> BR,
>>> Yinan
>>>
>>>
>>>> -----Original Message-----
>>>> From: dev <dev-bounces at dpdk.org> On Behalf Of Maxime Coquelin
>>>> Sent: 2020?9?30? 0:14
>>>> To: dev at dpdk.org; Xia, Chenbo <chenbo.xia at intel.com>; Fu, Patrick
>>>> <patrick.fu at intel.com>; amorenoz at redhat.com
>>>> Cc: Maxime Coquelin <maxime.coquelin at redhat.com>
>>>> Subject: [dpdk-dev] [PATCH v3 3/8] net/virtio: move backend type selection to
>>>> ethdev
>>>>
>>>> From: Adrian Moreno <amorenoz at redhat.com>
>>>>
>>>> This is a preparation patch with no functional change.
>>>>
>>>> Use an enum instead of a boolean for the backend type.
>>>> Move the detection logic to the ethdev layer (where it is needed for the
>>>> first time).
>>>> The virtio_user_dev stores the backend type in the virtio_user_dev
>>>> struct so the type is only determined once
>>>>
>>>> Signed-off-by: Maxime Coquelin <maxime.coquelin at redhat.com>
>>>> Signed-off-by: Adrian Moreno <amorenoz at redhat.com>
>>>> ---
>>>>  .../net/virtio/virtio_user/virtio_user_dev.c  | 37 ++++++++-----------
>>>>  .../net/virtio/virtio_user/virtio_user_dev.h  | 11 +++++-
>>>>  drivers/net/virtio/virtio_user_ethdev.c       | 28 +++++++++++++-
>>>>  3 files changed, 50 insertions(+), 26 deletions(-)
>>>>
>>>> diff --git a/drivers/net/virtio/virtio_user/virtio_user_dev.c
>>>> b/drivers/net/virtio/virtio_user/virtio_user_dev.c
>>>> index 2a0c861085..b79a9f84aa 100644
>>>> --- a/drivers/net/virtio/virtio_user/virtio_user_dev.c
>>>> +++ b/drivers/net/virtio/virtio_user/virtio_user_dev.c
>>>> @@ -111,17 +111,6 @@ virtio_user_queue_setup(struct virtio_user_dev *dev,
>>>>  	return 0;
>>>>  }
>>>>
>>>> -int
>>>> -is_vhost_user_by_type(const char *path)
>>>> -{
>>>> -	struct stat sb;
>>>> -
>>>> -	if (stat(path, &sb) == -1)
>>>> -		return 0;
>>>> -
>>>> -	return S_ISSOCK(sb.st_mode);
>>>> -}
>>>> -
>>>>  int
>>>>  virtio_user_start_device(struct virtio_user_dev *dev)
>>>>  {
>>>> @@ -144,7 +133,8 @@ virtio_user_start_device(struct virtio_user_dev *dev)
>>>>  	rte_mcfg_mem_read_lock();
>>>>  	pthread_mutex_lock(&dev->mutex);
>>>>
>>>> -	if (is_vhost_user_by_type(dev->path) && dev->vhostfd < 0)
>>>> +	if (dev->backend_type == VIRTIO_USER_BACKEND_VHOST_USER &&
>>>> +			dev->vhostfd < 0)
>>>>  		goto error;
>>>>
>>>>  	/* Step 0: tell vhost to create queues */
>>>> @@ -360,16 +350,16 @@ virtio_user_dev_setup(struct virtio_user_dev *dev)
>>>>  	dev->tapfds = NULL;
>>>>
>>>>  	if (dev->is_server) {
>>>> -		if (access(dev->path, F_OK) == 0 &&
>>>> -		    !is_vhost_user_by_type(dev->path)) {
>>>> -			PMD_DRV_LOG(ERR, "Server mode doesn't support
>>>> vhost-kernel!");
>>>> +		if (dev->backend_type !=
>>>> VIRTIO_USER_BACKEND_VHOST_USER) {
>>>> +			PMD_DRV_LOG(ERR, "Server mode only supports
>>>> vhost-user!");
>>>>  			return -1;
>>>>  		}
>>>>  		dev->ops = &virtio_ops_user;
>>>>  	} else {
>>>> -		if (is_vhost_user_by_type(dev->path)) {
>>>> +		if (dev->backend_type ==
>>>> VIRTIO_USER_BACKEND_VHOST_USER) {
>>>>  			dev->ops = &virtio_ops_user;
>>>> -		} else {
>>>> +		} else if (dev->backend_type ==
>>>> +
>>>> 	VIRTIO_USER_BACKEND_VHOST_KERNEL) {
>>>>  			dev->ops = &virtio_ops_kernel;
>>>>
>>>>  			dev->vhostfds = malloc(dev->max_queue_pairs *
>>>> @@ -430,7 +420,8 @@ virtio_user_dev_setup(struct virtio_user_dev *dev)
>>>>  int
>>>>  virtio_user_dev_init(struct virtio_user_dev *dev, char *path, int queues,
>>>>  		     int cq, int queue_size, const char *mac, char **ifname,
>>>> -		     int server, int mrg_rxbuf, int in_order, int packed_vq)
>>>> +		     int server, int mrg_rxbuf, int in_order, int packed_vq,
>>>> +		     enum virtio_user_backend_type backend_type)
>>>>  {
>>>>  	uint64_t protocol_features = 0;
>>>>
>>>> @@ -445,6 +436,8 @@ virtio_user_dev_init(struct virtio_user_dev *dev, char
>>>> *path, int queues,
>>>>  	dev->frontend_features = 0;
>>>>  	dev->unsupported_features = ~VIRTIO_USER_SUPPORTED_FEATURES;
>>>>  	dev->protocol_features =
>>>> VIRTIO_USER_SUPPORTED_PROTOCOL_FEATURES;
>>>> +	dev->backend_type = backend_type;
>>>> +
>>>>  	parse_mac(dev, mac);
>>>>
>>>>  	if (*ifname) {
>>>> @@ -457,7 +450,7 @@ virtio_user_dev_init(struct virtio_user_dev *dev, char
>>>> *path, int queues,
>>>>  		return -1;
>>>>  	}
>>>>
>>>> -	if (!is_vhost_user_by_type(dev->path))
>>>> +	if (dev->backend_type != VIRTIO_USER_BACKEND_VHOST_USER)
>>>>  		dev->unsupported_features |=
>>>>  			(1ULL << VHOST_USER_F_PROTOCOL_FEATURES);
>>>>
>>>> @@ -539,7 +532,7 @@ virtio_user_dev_init(struct virtio_user_dev *dev, char
>>>> *path, int queues,
>>>>  	}
>>>>
>>>>  	/* The backend will not report this feature, we add it explicitly */
>>>> -	if (is_vhost_user_by_type(dev->path))
>>>> +	if (dev->backend_type == VIRTIO_USER_BACKEND_VHOST_USER)
>>>>  		dev->frontend_features |= (1ull << VIRTIO_NET_F_STATUS);
>>>>
>>>>  	/*
>>>> @@ -792,7 +785,7 @@ virtio_user_send_status_update(struct virtio_user_dev
>>>> *dev, uint8_t status)
>>>>  	uint64_t arg = status;
>>>>
>>>>  	/* Vhost-user only for now */
>>>> -	if (!is_vhost_user_by_type(dev->path))
>>>> +	if (dev->backend_type != VIRTIO_USER_BACKEND_VHOST_USER)
>>>>  		return 0;
>>>>
>>>>  	if (!(dev->protocol_features & (1ULL <<
>>>> VHOST_USER_PROTOCOL_F_STATUS)))
>>>> @@ -815,7 +808,7 @@ virtio_user_update_status(struct virtio_user_dev *dev)
>>>>  	int err;
>>>>
>>>>  	/* Vhost-user only for now */
>>>> -	if (!is_vhost_user_by_type(dev->path))
>>>> +	if (dev->backend_type != VIRTIO_USER_BACKEND_VHOST_USER)
>>>>  		return 0;
>>>>
>>>>  	if (!(dev->protocol_features & (1UL <<
>>>> VHOST_USER_PROTOCOL_F_STATUS)))
>>>> diff --git a/drivers/net/virtio/virtio_user/virtio_user_dev.h
>>>> b/drivers/net/virtio/virtio_user/virtio_user_dev.h
>>>> index 9377d5ba66..575bf430c0 100644
>>>> --- a/drivers/net/virtio/virtio_user/virtio_user_dev.h
>>>> +++ b/drivers/net/virtio/virtio_user/virtio_user_dev.h
>>>> @@ -10,6 +10,12 @@
>>>>  #include "../virtio_pci.h"
>>>>  #include "../virtio_ring.h"
>>>>
>>>> +enum virtio_user_backend_type {
>>>> +	VIRTIO_USER_BACKEND_UNKNOWN,
>>>> +	VIRTIO_USER_BACKEND_VHOST_USER,
>>>> +	VIRTIO_USER_BACKEND_VHOST_KERNEL,
>>>> +};
>>>> +
>>>>  struct virtio_user_queue {
>>>>  	uint16_t used_idx;
>>>>  	bool avail_wrap_counter;
>>>> @@ -17,6 +23,7 @@ struct virtio_user_queue {
>>>>  };
>>>>
>>>>  struct virtio_user_dev {
>>>> +	enum virtio_user_backend_type backend_type;
>>>>  	/* for vhost_user backend */
>>>>  	int		vhostfd;
>>>>  	int		listenfd;   /* listening fd */
>>>> @@ -60,13 +67,13 @@ struct virtio_user_dev {
>>>>  	bool		started;
>>>>  };
>>>>
>>>> -int is_vhost_user_by_type(const char *path);
>>>>  int virtio_user_start_device(struct virtio_user_dev *dev);
>>>>  int virtio_user_stop_device(struct virtio_user_dev *dev);
>>>>  int virtio_user_dev_init(struct virtio_user_dev *dev, char *path, int queues,
>>>>  			 int cq, int queue_size, const char *mac, char **ifname,
>>>>  			 int server, int mrg_rxbuf, int in_order,
>>>> -			 int packed_vq);
>>>> +			 int packed_vq,
>>>> +			 enum virtio_user_backend_type backend_type);
>>>>  void virtio_user_dev_uninit(struct virtio_user_dev *dev);
>>>>  void virtio_user_handle_cq(struct virtio_user_dev *dev, uint16_t queue_idx);
>>>>  void virtio_user_handle_cq_packed(struct virtio_user_dev *dev,
>>>> diff --git a/drivers/net/virtio/virtio_user_ethdev.c
>>>> b/drivers/net/virtio/virtio_user_ethdev.c
>>>> index 60d17af888..38b49bad5f 100644
>>>> --- a/drivers/net/virtio/virtio_user_ethdev.c
>>>> +++ b/drivers/net/virtio/virtio_user_ethdev.c
>>>> @@ -6,6 +6,7 @@
>>>>  #include <sys/types.h>
>>>>  #include <unistd.h>
>>>>  #include <fcntl.h>
>>>> +#include <sys/stat.h>
>>>>  #include <sys/socket.h>
>>>>
>>>>  #include <rte_malloc.h>
>>>> @@ -518,6 +519,19 @@ get_integer_arg(const char *key __rte_unused,
>>>>  	return -errno;
>>>>  }
>>>>
>>>> +static enum virtio_user_backend_type
>>>> +virtio_user_backend_type(const char *path)
>>>> +{
>>>> +	struct stat sb;
>>>> +
>>>> +	if (stat(path, &sb) == -1)
>>>> +		return VIRTIO_USER_BACKEND_UNKNOWN;
>>>> +
>>>> +	return S_ISSOCK(sb.st_mode) ?
>>>> +		VIRTIO_USER_BACKEND_VHOST_USER :
>>>> +		VIRTIO_USER_BACKEND_VHOST_KERNEL;
>>>> +}
>>>> +
>>>>  static struct rte_eth_dev *
>>>>  virtio_user_eth_dev_alloc(struct rte_vdev_device *vdev)
>>>>  {
>>>> @@ -579,6 +593,7 @@ virtio_user_pmd_probe(struct rte_vdev_device *dev)
>>>>  	struct rte_kvargs *kvlist = NULL;
>>>>  	struct rte_eth_dev *eth_dev;
>>>>  	struct virtio_hw *hw;
>>>> +	enum virtio_user_backend_type backend_type =
>>>> VIRTIO_USER_BACKEND_UNKNOWN;
>>>>  	uint64_t queues = VIRTIO_USER_DEF_Q_NUM;
>>>>  	uint64_t cq = VIRTIO_USER_DEF_CQ_EN;
>>>>  	uint64_t queue_size = VIRTIO_USER_DEF_Q_SZ;
>>>> @@ -631,8 +646,17 @@ virtio_user_pmd_probe(struct rte_vdev_device *dev)
>>>>  		goto end;
>>>>  	}
>>>>
>>>> +	backend_type = virtio_user_backend_type(path);
>>>> +	if (backend_type == VIRTIO_USER_BACKEND_UNKNOWN) {
>>>> +		PMD_INIT_LOG(ERR,
>>>> +			     "unable to determine backend type for path %s",
>>>> +			path);
>>>> +		goto end;
>>>> +	}
>>>> +
>>>> +
>>>>  	if (rte_kvargs_count(kvlist, VIRTIO_USER_ARG_INTERFACE_NAME) == 1)
>>>> {
>>>> -		if (is_vhost_user_by_type(path)) {
>>>> +		if (backend_type != VIRTIO_USER_BACKEND_VHOST_KERNEL) {
>>>>  			PMD_INIT_LOG(ERR,
>>>>  				"arg %s applies only to vhost-kernel backend",
>>>>  				VIRTIO_USER_ARG_INTERFACE_NAME);
>>>> @@ -751,7 +775,7 @@ virtio_user_pmd_probe(struct rte_vdev_device *dev)
>>>>  	hw = eth_dev->data->dev_private;
>>>>  	if (virtio_user_dev_init(hw->virtio_user_dev, path, queues, cq,
>>>>  			 queue_size, mac_addr, &ifname, server_mode,
>>>> -			 mrg_rxbuf, in_order, packed_vq) < 0) {
>>>> +			 mrg_rxbuf, in_order, packed_vq, backend_type) < 0) {
>>>>  		PMD_INIT_LOG(ERR, "virtio_user_dev_init fails");
>>>>  		virtio_user_eth_dev_free(eth_dev);
>>>>  		goto end;
>>>> --
>>>> 2.26.2
>>
> 

-- 
Adrián Moreno