DPDK patches and discussions
 help / color / mirror / Atom feed
From: Maxime Coquelin <maxime.coquelin@redhat.com>
To: Adrian Moreno <amorenoz@redhat.com>,
	"Xia, Chenbo" <chenbo.xia@intel.com>,
	"dev@dpdk.org" <dev@dpdk.org>,
	"olivier.matz@6wind.com" <olivier.matz@6wind.com>,
	"david.marchand@redhat.com" <david.marchand@redhat.com>
Subject: Re: [dpdk-dev] [PATCH 25/40] net/virtio: add Virtio-user features ops
Date: Wed, 13 Jan 2021 14:54:53 +0100
Message-ID: <4277cc0a-d0cd-49ec-148d-d7d6a5645279@redhat.com> (raw)
In-Reply-To: <6b3ee0bc-1e26-0b48-6f84-90c4948e228b@redhat.com>



On 1/13/21 2:43 PM, Adrian Moreno wrote:
> Hi Chenbo
> 
> On 1/6/21 12:54 PM, Xia, Chenbo wrote:
>> Hi Maxime,
>>
>>> -----Original Message-----
>>> From: Maxime Coquelin <maxime.coquelin@redhat.com>
>>> Sent: Monday, December 21, 2020 5:14 AM
>>> To: dev@dpdk.org; Xia, Chenbo <chenbo.xia@intel.com>; olivier.matz@6wind.com;
>>> amorenoz@redhat.com; david.marchand@redhat.com
>>> Cc: Maxime Coquelin <maxime.coquelin@redhat.com>
>>> Subject: [PATCH 25/40] net/virtio: add Virtio-user features ops
>>>
>>> This patch introduce new callbacks for getting
>>
>> s/introduce/introduces
>>
>>> and setting Virtio features, and implements them
>>> for the different backend types.
>>>
>>> Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
>>> ---
>>>  drivers/net/virtio/virtio_user/vhost.h        |   2 +
>>>  drivers/net/virtio/virtio_user/vhost_kernel.c | 150 +++++++++---------
>>>  .../net/virtio/virtio_user/vhost_kernel_tap.c |  23 +++
>>>  .../net/virtio/virtio_user/vhost_kernel_tap.h |   1 +
>>>  drivers/net/virtio/virtio_user/vhost_user.c   |  63 +++++++-
>>>  drivers/net/virtio/virtio_user/vhost_vdpa.c   |  38 +++--
>>>  .../net/virtio/virtio_user/virtio_user_dev.c  |   5 +-
>>>  drivers/net/virtio/virtio_user_ethdev.c       |   3 +-
>>>  8 files changed, 188 insertions(+), 97 deletions(-)
>>>
>>> diff --git a/drivers/net/virtio/virtio_user/vhost.h
>>> b/drivers/net/virtio/virtio_user/vhost.h
>>> index 8e819ecfb8..16978e27ed 100644
>>> --- a/drivers/net/virtio/virtio_user/vhost.h
>>> +++ b/drivers/net/virtio/virtio_user/vhost.h
>>> @@ -102,6 +102,8 @@ struct virtio_user_dev;
>>>  struct virtio_user_backend_ops {
>>>  	int (*setup)(struct virtio_user_dev *dev);
>>>  	int (*set_owner)(struct virtio_user_dev *dev);
>>> +	int (*get_features)(struct virtio_user_dev *dev, uint64_t *features);
>>> +	int (*set_features)(struct virtio_user_dev *dev, uint64_t features);
>>>  	int (*send_request)(struct virtio_user_dev *dev,
>>>  			    enum vhost_user_request req,
>>>  			    void *arg);
>>> diff --git a/drivers/net/virtio/virtio_user/vhost_kernel.c
>>> b/drivers/net/virtio/virtio_user/vhost_kernel.c
>>> index b79dcad179..f44df8ef1f 100644
>>> --- a/drivers/net/virtio/virtio_user/vhost_kernel.c
>>> +++ b/drivers/net/virtio/virtio_user/vhost_kernel.c
>>> @@ -38,6 +38,28 @@ struct vhost_memory_kernel {
>>>  #define VHOST_SET_VRING_ERR _IOW(VHOST_VIRTIO, 0x22, struct vhost_vring_file)
>>>  #define VHOST_NET_SET_BACKEND _IOW(VHOST_VIRTIO, 0x30, struct
>>> vhost_vring_file)
>>>
>>> +/* with below features, vhost kernel does not need to do the checksum and TSO,
>>> + * these info will be passed to virtio_user through virtio net header.
>>> + */
>>> +#define VHOST_KERNEL_GUEST_OFFLOADS_MASK	\
>>> +	((1ULL << VIRTIO_NET_F_GUEST_CSUM) |	\
>>> +	 (1ULL << VIRTIO_NET_F_GUEST_TSO4) |	\
>>> +	 (1ULL << VIRTIO_NET_F_GUEST_TSO6) |	\
>>> +	 (1ULL << VIRTIO_NET_F_GUEST_ECN)  |	\
>>> +	 (1ULL << VIRTIO_NET_F_GUEST_UFO))
>>> +
>>> +/* with below features, when flows from virtio_user to vhost kernel
>>> + * (1) if flows goes up through the kernel networking stack, it does not need
>>> + * to verify checksum, which can save CPU cycles;
>>> + * (2) if flows goes through a Linux bridge and outside from an interface
>>> + * (kernel driver), checksum and TSO will be done by GSO in kernel or even
>>> + * offloaded into real physical device.
>>> + */
>>> +#define VHOST_KERNEL_HOST_OFFLOADS_MASK		\
>>> +	((1ULL << VIRTIO_NET_F_HOST_TSO4) |	\
>>> +	 (1ULL << VIRTIO_NET_F_HOST_TSO6) |	\
>>> +	 (1ULL << VIRTIO_NET_F_CSUM))
>>> +
>>>  static uint64_t max_regions = 64;
>>>
>>>  static void
>>> @@ -77,10 +99,57 @@ vhost_kernel_set_owner(struct virtio_user_dev *dev)
>>>  	return vhost_kernel_ioctl(dev->vhostfds[0], VHOST_SET_OWNER, NULL);
>>>  }
>>>
>>> +static int
>>> +vhost_kernel_get_features(struct virtio_user_dev *dev, uint64_t *features)
>>> +{
>>> +	int ret;
>>> +	unsigned int tap_features;
>>> +
>>> +	ret = vhost_kernel_ioctl(dev->vhostfds[0], VHOST_GET_FEATURES, features);
>>> +	if (ret < 0) {
>>> +		PMD_DRV_LOG(ERR, "Failed to get features");
>>> +		return -1;
>>> +	}
>>> +
>>> +	ret = tap_support_features(&tap_features);
>>> +	if (ret < 0) {
>>> +		PMD_DRV_LOG(ERR, "Failed to get TAP features)");
>>
>> should delete ')' after 'features'?
>>
>>> +		return -1;
>>> +	}
>>> +
>>> +	/* with tap as the backend, all these features are supported
>>> +	 * but not claimed by vhost-net, so we add them back when
>>> +	 * reporting to upper layer.
>>> +	 */
>>
>> <snip>
>>
>>>  	.dma_map = vhost_vdpa_dma_map,
>>> diff --git a/drivers/net/virtio/virtio_user/virtio_user_dev.c
>>> b/drivers/net/virtio/virtio_user/virtio_user_dev.c
>>> index f8e4581951..0a85d058a8 100644
>>> --- a/drivers/net/virtio/virtio_user/virtio_user_dev.c
>>> +++ b/drivers/net/virtio/virtio_user/virtio_user_dev.c
>>> @@ -141,7 +141,7 @@ virtio_user_dev_set_features(struct virtio_user_dev *dev)
>>>  	/* Strip VIRTIO_NET_F_CTRL_VQ, as devices do not really need to know */
>>>  	features &= ~(1ull << VIRTIO_NET_F_CTRL_VQ);
>>>  	features &= ~(1ull << VIRTIO_NET_F_STATUS);
>>> -	ret = dev->ops->send_request(dev, VHOST_USER_SET_FEATURES, &features);
>>> +	ret = dev->ops->set_features(dev, features);
>>
>> I noticed that virtio_user_dev_set_features is called by virtio_user_set_status.
>> The former may fail but the latter will ignore the failure. So this will happen:
>> setting features already failed but virtio-user still continue to do things. IMHO, 
>> this is not very good (similar things may happen for virtio_user_start_device).
>> What do you think?
>>
> You're right. Although  set_status(features_ok) should be followed by
> get_status() to check if device has set feature_ok bit, the problem is that
> set_status is called on device initialization, which would happen even when the
> vhost backed is not yet connected (server-mode). Failing there would tear down
> the ethdev which would make the future "hotplug" fail. Hopefully this will all
> be fixed by Maxime's refactoring :)
> So +1 to reconsider improving error propagation here.

Yes, makes sense.
Sorry for not replying earlier, I'm rebasing the series and than will
look at all your comments one by one.

Thanks,
Maxime

>> Thanks,
>> Chenbo
>>
>>>  	if (ret < 0)
>>>  		goto error;
>>>  	PMD_DRV_LOG(INFO, "set features: %" PRIx64, features);
>>> @@ -488,8 +488,7 @@ virtio_user_dev_init(struct virtio_user_dev *dev, char
>>> *path, int queues,
>>>  			return -1;
>>>  		}
>>>
>>> -		if (dev->ops->send_request(dev, VHOST_USER_GET_FEATURES,
>>> -					   &dev->device_features) < 0) {
>>> +		if (dev->ops->get_features(dev, &dev->device_features) < 0) {
>>>  			PMD_INIT_LOG(ERR, "get_features failed: %s",
>>>  				     strerror(errno));
>>>  			return -1;
>>> diff --git a/drivers/net/virtio/virtio_user_ethdev.c
>>> b/drivers/net/virtio/virtio_user_ethdev.c
>>> index 283f5c7a36..4d2635c8aa 100644
>>> --- a/drivers/net/virtio/virtio_user_ethdev.c
>>> +++ b/drivers/net/virtio/virtio_user_ethdev.c
>>> @@ -85,8 +85,7 @@ virtio_user_server_reconnect(struct virtio_user_dev *dev)
>>>
>>>  	virtio_set_status(hw, VIRTIO_CONFIG_STATUS_DRIVER);
>>>
>>> -	if (dev->ops->send_request(dev, VHOST_USER_GET_FEATURES,
>>> -				   &dev->device_features) < 0) {
>>> +	if (dev->ops->get_features(dev, &dev->device_features) < 0) {
>>>  		PMD_INIT_LOG(ERR, "get_features failed: %s",
>>>  			     strerror(errno));
>>>  		return -1;
>>> --
>>> 2.29.2
>>
> 


  reply	other threads:[~2021-01-13 13:55 UTC|newest]

Thread overview: 149+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-20 21:13 [dpdk-dev] [PATCH 00/40] net/virtio: Virtio PMD rework Maxime Coquelin
2020-12-20 21:13 ` [dpdk-dev] [PATCH 01/40] bus/vdev: add helper to get vdev from eth dev Maxime Coquelin
2020-12-30  3:02   ` Xia, Chenbo
2021-01-05 21:15   ` David Marchand
2020-12-20 21:13 ` [dpdk-dev] [PATCH 02/40] net/virtio: Introduce Virtio bus type Maxime Coquelin
2020-12-30  3:02   ` Xia, Chenbo
2021-01-05 21:15   ` David Marchand
2021-01-14  9:24     ` Maxime Coquelin
2021-01-14 10:54       ` Maxime Coquelin
2021-01-14 11:55         ` David Marchand
2020-12-20 21:13 ` [dpdk-dev] [PATCH 03/40] net/virtio: refactor virtio-user device Maxime Coquelin
2020-12-30  3:02   ` Xia, Chenbo
2021-01-05 21:16   ` David Marchand
2021-01-14  9:26     ` Maxime Coquelin
2020-12-20 21:13 ` [dpdk-dev] [PATCH 04/40] net/virtio: introduce PCI device metadata Maxime Coquelin
2020-12-30  3:02   ` Xia, Chenbo
2021-01-05 21:16   ` David Marchand
2021-01-14 11:05     ` Maxime Coquelin
2021-01-14 14:40       ` David Marchand
2021-01-14 14:44         ` Maxime Coquelin
2020-12-20 21:13 ` [dpdk-dev] [PATCH 05/40] net/virtio: move PCI device init in dedicated file Maxime Coquelin
2020-12-30  3:02   ` Xia, Chenbo
2021-01-05 21:19   ` David Marchand
2021-01-14 16:04     ` Maxime Coquelin
2021-01-14 16:14       ` David Marchand
2020-12-20 21:13 ` [dpdk-dev] [PATCH 06/40] net/virtio: move PCI specific dev init to PCI ethdev init Maxime Coquelin
2020-12-30  3:05   ` Xia, Chenbo
2021-01-06  8:58   ` David Marchand
2020-12-20 21:13 ` [dpdk-dev] [PATCH 07/40] net/virtio: move MSIX detection to PCI ethdev Maxime Coquelin
2020-12-30  3:05   ` Xia, Chenbo
2021-01-06  8:22   ` David Marchand
2021-01-14 17:19     ` Maxime Coquelin
2020-12-20 21:13 ` [dpdk-dev] [PATCH 08/40] net/virtio: force IOVA as VA mode for Virtio-user Maxime Coquelin
2020-12-30  3:06   ` Xia, Chenbo
2021-01-06  9:06   ` David Marchand
2021-01-06  9:11     ` Thomas Monjalon
2021-01-06  9:22       ` Maxime Coquelin
2021-01-06 16:37       ` Kinsella, Ray
2021-01-06  9:14     ` Maxime Coquelin
2020-12-20 21:13 ` [dpdk-dev] [PATCH 09/40] net/virtio: store PCI type in Virtio device metadata Maxime Coquelin
2020-12-30  3:07   ` Xia, Chenbo
2021-01-06  9:14   ` David Marchand
2020-12-20 21:13 ` [dpdk-dev] [PATCH 10/40] net/virtio: add callback for device closing Maxime Coquelin
2020-12-30  3:07   ` Xia, Chenbo
2021-01-06  9:33   ` David Marchand
2020-12-20 21:13 ` [dpdk-dev] [PATCH 11/40] net/virtio: validate features at bus level Maxime Coquelin
2020-12-30  3:08   ` Xia, Chenbo
2021-01-06  9:33   ` David Marchand
2021-01-15  9:20     ` Maxime Coquelin
2020-12-20 21:13 ` [dpdk-dev] [PATCH 12/40] net/virtio: remove bus type enum Maxime Coquelin
2020-12-30  3:08   ` Xia, Chenbo
2021-01-06  9:33   ` David Marchand
2020-12-20 21:13 ` [dpdk-dev] [PATCH 13/40] net/virtio: move PCI-specific fields to PCI device Maxime Coquelin
2020-12-30  3:08   ` Xia, Chenbo
2021-01-06  9:58   ` David Marchand
2020-12-20 21:13 ` [dpdk-dev] [PATCH 14/40] net/virtio: pack virtio HW struct Maxime Coquelin
2020-12-30  3:09   ` Xia, Chenbo
2021-01-06  9:58   ` David Marchand
2021-01-15  9:35     ` Maxime Coquelin
2020-12-20 21:13 ` [dpdk-dev] [PATCH 15/40] net/virtio: move legacy IO to Virtio PCI Maxime Coquelin
2020-12-30  3:09   ` Xia, Chenbo
2021-01-06 10:09   ` David Marchand
2020-12-20 21:13 ` [dpdk-dev] [PATCH 16/40] net/virtio: introduce generic virtio header Maxime Coquelin
2020-12-30  3:09   ` Xia, Chenbo
2021-01-06 10:08   ` David Marchand
2021-01-15  9:39     ` Maxime Coquelin
2020-12-20 21:13 ` [dpdk-dev] [PATCH 17/40] net/virtio: move features definition to generic header Maxime Coquelin
2020-12-30  3:14   ` Xia, Chenbo
2021-01-14  8:40     ` Maxime Coquelin
2020-12-20 21:13 ` [dpdk-dev] [PATCH 18/40] net/virtio: move virtqueue defines in " Maxime Coquelin
2020-12-30  3:14   ` Xia, Chenbo
2021-01-06 15:53   ` David Marchand
2021-01-15 10:55     ` Maxime Coquelin
2020-12-20 21:13 ` [dpdk-dev] [PATCH 19/40] net/virtio: move config definitions to " Maxime Coquelin
2020-12-30  3:15   ` Xia, Chenbo
2021-01-06 16:01   ` David Marchand
2021-01-15 11:01     ` Maxime Coquelin
2020-12-20 21:13 ` [dpdk-dev] [PATCH 20/40] net/virtio: make interrupt handling more generic Maxime Coquelin
2020-12-30  3:17   ` Xia, Chenbo
2021-01-14  8:43     ` Maxime Coquelin
2021-01-06 16:07   ` David Marchand
2020-12-20 21:13 ` [dpdk-dev] [PATCH 21/40] net/virtio: move vring alignment to generic header Maxime Coquelin
2020-12-30  3:18   ` Xia, Chenbo
2021-01-06 16:13   ` David Marchand
2020-12-20 21:13 ` [dpdk-dev] [PATCH 22/40] net/virtio: remove last PCI refs in non-PCI code Maxime Coquelin
2020-12-30  3:25   ` Xia, Chenbo
2021-01-14  8:46     ` Maxime Coquelin
2021-01-06 16:18   ` David Marchand
2021-01-15 11:10     ` Maxime Coquelin
2020-12-20 21:13 ` [dpdk-dev] [PATCH 23/40] net/virtio: make Vhost-user req sender consistent Maxime Coquelin
2021-01-06 11:50   ` Xia, Chenbo
2021-01-15  9:47     ` Maxime Coquelin
2020-12-20 21:13 ` [dpdk-dev] [PATCH 24/40] net/virtio: add Virtio-user ops to set owner Maxime Coquelin
2021-01-06 11:50   ` Xia, Chenbo
2020-12-20 21:13 ` [dpdk-dev] [PATCH 25/40] net/virtio: add Virtio-user features ops Maxime Coquelin
2021-01-06 11:54   ` Xia, Chenbo
2021-01-13 13:43     ` Adrian Moreno
2021-01-13 13:54       ` Maxime Coquelin [this message]
2021-01-15 14:19       ` Maxime Coquelin
2021-01-13 13:57   ` Adrian Moreno
2021-01-15 14:29     ` Maxime Coquelin
2020-12-20 21:13 ` [dpdk-dev] [PATCH 26/40] net/virtio: add Virtio-user protocol " Maxime Coquelin
2021-01-06 11:55   ` Xia, Chenbo
2020-12-20 21:13 ` [dpdk-dev] [PATCH 27/40] net/virtio: add Virtio-user memory tables ops Maxime Coquelin
2021-01-06 11:57   ` Xia, Chenbo
2021-01-15  9:57     ` Maxime Coquelin
2020-12-20 21:13 ` [dpdk-dev] [PATCH 28/40] net/virtio: add Virtio-user vring setting ops Maxime Coquelin
2021-01-05 21:24   ` David Marchand
2021-01-06 12:01   ` Xia, Chenbo
2021-01-15 10:12     ` Maxime Coquelin
2021-01-06 12:03   ` Xia, Chenbo
2021-01-15 10:15     ` Maxime Coquelin
2020-12-20 21:13 ` [dpdk-dev] [PATCH 29/40] net/virtio: add Virtio-user vring file ops Maxime Coquelin
2021-01-05 21:24   ` David Marchand
2021-01-06 12:04   ` Xia, Chenbo
2021-01-15 10:17     ` Maxime Coquelin
2020-12-20 21:13 ` [dpdk-dev] [PATCH 30/40] net/virtio: add Virtio-user vring address ops Maxime Coquelin
2021-01-06 12:06   ` Xia, Chenbo
2021-01-15 10:19     ` Maxime Coquelin
2020-12-20 21:13 ` [dpdk-dev] [PATCH 31/40] net/virtio: add Virtio-user status ops Maxime Coquelin
2021-01-06 12:09   ` Xia, Chenbo
2021-01-15 10:48     ` Maxime Coquelin
2020-12-20 21:13 ` [dpdk-dev] [PATCH 32/40] net/virtio: remove useless request ops Maxime Coquelin
2020-12-20 21:13 ` [dpdk-dev] [PATCH 33/40] net/virtio: improve Virtio-user errors handling Maxime Coquelin
2021-01-07  2:26   ` Xia, Chenbo
2021-01-15 11:09     ` Maxime Coquelin
2020-12-20 21:13 ` [dpdk-dev] [PATCH 34/40] net/virtio: move Vhost-user reqs to Vhost-user backend Maxime Coquelin
2020-12-20 21:14 ` [dpdk-dev] [PATCH 35/40] net/virtio: make server mode blocking Maxime Coquelin
2021-01-07  3:20   ` Xia, Chenbo
2021-01-15 11:13     ` Maxime Coquelin
2020-12-20 21:14 ` [dpdk-dev] [PATCH 36/40] net/virtio: move protocol features to Vhost-user Maxime Coquelin
2020-12-20 21:14 ` [dpdk-dev] [PATCH 37/40] net/virtio: introduce backend data Maxime Coquelin
2021-01-05 21:26   ` David Marchand
2021-01-13 17:18   ` Adrian Moreno
2021-01-15 16:49     ` Maxime Coquelin
2020-12-20 21:14 ` [dpdk-dev] [PATCH 38/40] net/virtio: move Vhost-user specifics to its backend Maxime Coquelin
2021-01-07  6:32   ` Xia, Chenbo
2021-01-15 12:03     ` Maxime Coquelin
2020-12-20 21:14 ` [dpdk-dev] [PATCH 39/40] net/virtio: move Vhost-kernel data " Maxime Coquelin
2021-01-07  6:42   ` Xia, Chenbo
2021-01-11  8:02   ` Xia, Chenbo
2021-01-15 11:54     ` Maxime Coquelin
2021-01-18 20:36     ` Maxime Coquelin
2020-12-20 21:14 ` [dpdk-dev] [PATCH 40/40] net/virtio: move Vhost-vDPA " Maxime Coquelin
2020-12-22 15:20   ` Maxime Coquelin
2021-01-07  6:50   ` Xia, Chenbo
2021-01-15 12:08     ` Maxime Coquelin
2021-01-11  8:05   ` Xia, Chenbo
2020-12-21 10:58 ` [dpdk-dev] [PATCH 00/40] net/virtio: Virtio PMD rework Maxime Coquelin

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=4277cc0a-d0cd-49ec-148d-d7d6a5645279@redhat.com \
    --to=maxime.coquelin@redhat.com \
    --cc=amorenoz@redhat.com \
    --cc=chenbo.xia@intel.com \
    --cc=david.marchand@redhat.com \
    --cc=dev@dpdk.org \
    --cc=olivier.matz@6wind.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

DPDK patches and discussions

This inbox may be cloned and mirrored by anyone:

	git clone --mirror https://inbox.dpdk.org/dev/0 dev/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 dev dev/ https://inbox.dpdk.org/dev \
		dev@dpdk.org
	public-inbox-index dev

Example config snippet for mirrors.
Newsgroup available over NNTP:
	nntp://inbox.dpdk.org/inbox.dpdk.dev


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git