RE: [PATCH v6 03/16] vhost: add vhost msg support

["Xia, Chenbo" <chenbo.xia@intel.com>]

> -----Original Message-----
> From: Pei, Andy <andy.pei@intel.com>
> Sent: Tuesday, April 26, 2022 4:56 PM
> To: Xia, Chenbo <chenbo.xia@intel.com>; dev@dpdk.org
> Cc: maxime.coquelin@redhat.com; Cao, Gang <gang.cao@intel.com>; Liu,
> Changpeng <changpeng.liu@intel.com>
> Subject: RE: [PATCH v6 03/16] vhost: add vhost msg support
> 
> HI Chenbo,
> 
> Thanks for your reply.
> My reply is inline.
> 
> > -----Original Message-----
> > From: Xia, Chenbo <chenbo.xia@intel.com>
> > Sent: Monday, April 25, 2022 8:42 PM
> > To: Pei, Andy <andy.pei@intel.com>; dev@dpdk.org
> > Cc: maxime.coquelin@redhat.com; Cao, Gang <gang.cao@intel.com>; Liu,
> > Changpeng <changpeng.liu@intel.com>
> > Subject: RE: [PATCH v6 03/16] vhost: add vhost msg support
> >
> > Hi Andy,
> >
> > > -----Original Message-----
> > > From: Pei, Andy <andy.pei@intel.com>
> > > Sent: Thursday, April 21, 2022 4:34 PM
> > > To: dev@dpdk.org
> > > Cc: Xia, Chenbo <chenbo.xia@intel.com>; maxime.coquelin@redhat.com;
> > > Cao, Gang <gang.cao@intel.com>; Liu, Changpeng
> > > <changpeng.liu@intel.com>
> > > Subject: [PATCH v6 03/16] vhost: add vhost msg support
> > >
> > > Add support for VHOST_USER_GET_CONFIG and
> > VHOST_USER_SET_CONFIG.
> > > VHOST_USER_GET_CONFIG and VHOST_USER_SET_CONFIG message is only
> > > supported by virtio blk VDPA device.
> > >
> > > Signed-off-by: Andy Pei <andy.pei@intel.com>
> > > ---
> > >  lib/vhost/vhost_user.c | 69
> > > ++++++++++++++++++++++++++++++++++++++++++++++++++
> > >  lib/vhost/vhost_user.h | 13 ++++++++++
> > >  2 files changed, 82 insertions(+)
> > >
> > > diff --git a/lib/vhost/vhost_user.c b/lib/vhost/vhost_user.c index
> > > 1d39067..3780804 100644
> > > --- a/lib/vhost/vhost_user.c
> > > +++ b/lib/vhost/vhost_user.c
> > > @@ -80,6 +80,8 @@
> > >  [VHOST_USER_NET_SET_MTU]  = "VHOST_USER_NET_SET_MTU",
> > >  [VHOST_USER_SET_SLAVE_REQ_FD]  =
> > "VHOST_USER_SET_SLAVE_REQ_FD",
> > >  [VHOST_USER_IOTLB_MSG]  = "VHOST_USER_IOTLB_MSG",
> > > +[VHOST_USER_GET_CONFIG]  = "VHOST_USER_GET_CONFIG",
> > > +[VHOST_USER_SET_CONFIG]  = "VHOST_USER_SET_CONFIG",
> > >  [VHOST_USER_CRYPTO_CREATE_SESS] =
> > "VHOST_USER_CRYPTO_CREATE_SESS",
> > >  [VHOST_USER_CRYPTO_CLOSE_SESS] =
> > "VHOST_USER_CRYPTO_CLOSE_SESS",
> > >  [VHOST_USER_POSTCOPY_ADVISE]  =
> > "VHOST_USER_POSTCOPY_ADVISE", @@
> > > -2542,6 +2544,71 @@ static int is_vring_iotlb(struct virtio_net *dev,
> > > }
> > >
> > >  static int
> > > +vhost_user_get_config(struct virtio_net **pdev,
> > > +struct vhu_msg_context *ctx,
> > > +int main_fd __rte_unused)
> > > +{
> > > +struct virtio_net *dev = *pdev;
> > > +struct rte_vdpa_device *vdpa_dev = dev->vdpa_dev;
> > > +int ret = 0;
> > > +
> > > +if (vdpa_dev->ops->get_config) {
> > > +ret = vdpa_dev->ops->get_config(dev->vid,
> > > +   ctx->msg.payload.cfg.region,
> > > +   ctx->msg.payload.cfg.size);
> > > +if (ret != 0) {
> > > +ctx->msg.size = 0;
> > > +VHOST_LOG_CONFIG(ERR,
> > > + "(%s) get_config() return error!\n",
> > > + dev->ifname);
> > > +}
> > > +} else {
> > > +VHOST_LOG_CONFIG(ERR, "(%s) get_config() not
> > supportted!\n",
> >
> > Supported
> >
> I will send out a new version to fix this.
> > > + dev->ifname);
> > > +}
> > > +
> > > +return RTE_VHOST_MSG_RESULT_REPLY;
> > > +}
> > > +
> > > +static int
> > > +vhost_user_set_config(struct virtio_net **pdev,
> > > +struct vhu_msg_context *ctx,
> > > +int main_fd __rte_unused)
> > > +{
> > > +struct virtio_net *dev = *pdev;
> > > +struct rte_vdpa_device *vdpa_dev = dev->vdpa_dev;
> > > +int ret = 0;
> > > +
> > > +if (ctx->msg.size != sizeof(struct vhost_user_config)) {
> >
> > I think you should do sanity check on payload.cfg.size and make sure
> it's
> > smaller than VHOST_USER_MAX_CONFIG_SIZE
> >
> > and same check for offset
> >
> I think payload.cfg.size can be smaller than or equal to
> VHOST_USER_MAX_CONFIG_SIZE.
> payload.cfg.ofset can be smaller than or equal to
> VHOST_USER_MAX_CONFIG_SIZE as well

After double check: offset is the config space offset, so this should be checked
in vdpa driver. Size check on vhost lib layer should be just <= MAX_you_defined

Thanks,
Chenbo

> 
> > > +VHOST_LOG_CONFIG(ERR,
> > > +"(%s) invalid set config msg size: %"PRId32" != %d\n",
> > > +dev->ifname, ctx->msg.size,
> >
> > Based on you will change the log too, payload.cfg.size is uint32_t, so
> PRId32 ->
> > PRIu32
> >
> > > +(int)sizeof(struct vhost_user_config));
> >
> > So this can be %u
> >
> Sure.
> > > +goto OUT;
> > > +}
> > > +
> > > +if (vdpa_dev->ops->set_config) {
> > > +ret = vdpa_dev->ops->set_config(dev->vid,
> > > +ctx->msg.payload.cfg.region,
> > > +ctx->msg.payload.cfg.offset,
> > > +ctx->msg.payload.cfg.size,
> > > +ctx->msg.payload.cfg.flags);
> > > +if (ret)
> > > +VHOST_LOG_CONFIG(ERR,
> > > + "(%s) set_config() return error!\n",
> > > + dev->ifname);
> > > +} else {
> > > +VHOST_LOG_CONFIG(ERR, "(%s) set_config() not
> > supportted!\n",
> >
> > Supported
> >
> I will send out a new version to fix this.
> > > + dev->ifname);
> > > +}
> > > +
> > > +return RTE_VHOST_MSG_RESULT_OK;
> > > +
> > > +OUT:
> >
> > Lower case looks better
> >
> OK. I will send out a new version to fix this.
> > > +return RTE_VHOST_MSG_RESULT_ERR;
> > > +}
> >
> > Almost all handlers need check on expected fd num (this case is 0), so
> the
> > above new handlers should also do that. Please refer to validate_msg_fds
> in
> > other handlers.
> >
> > BTW, you can wait for review for other patches and send new versions
> later.
> >
> I will send out new patch after vhost: validate fds attached to messages
> from David Marchand is merged.
> > Thanks,
> > Chenbo
> >
> > > +
> > > +static int
> > >  vhost_user_iotlb_msg(struct virtio_net **pdev,
> > >  struct vhu_msg_context *ctx,
> > >  int main_fd __rte_unused)
> > > @@ -2782,6 +2849,8 @@ typedef int (*vhost_message_handler_t)(struct
> > > virtio_net **pdev,
> > >  [VHOST_USER_NET_SET_MTU] = vhost_user_net_set_mtu,
> > >  [VHOST_USER_SET_SLAVE_REQ_FD] = vhost_user_set_req_fd,
> > >  [VHOST_USER_IOTLB_MSG] = vhost_user_iotlb_msg,
> > > +[VHOST_USER_GET_CONFIG] = vhost_user_get_config,
> > > +[VHOST_USER_SET_CONFIG] = vhost_user_set_config,
> > >  [VHOST_USER_POSTCOPY_ADVISE] =
> > vhost_user_set_postcopy_advise,
> > >  [VHOST_USER_POSTCOPY_LISTEN] = vhost_user_set_postcopy_listen,
> > >  [VHOST_USER_POSTCOPY_END] = vhost_user_postcopy_end, diff --
> > git
> > > a/lib/vhost/vhost_user.h b/lib/vhost/vhost_user.h index
> > > c946cc2..97cfb2f 100644
> > > --- a/lib/vhost/vhost_user.h
> > > +++ b/lib/vhost/vhost_user.h
> > > @@ -50,6 +50,8 @@
> > >  VHOST_USER_NET_SET_MTU = 20,
> > >  VHOST_USER_SET_SLAVE_REQ_FD = 21,
> > >  VHOST_USER_IOTLB_MSG = 22,
> > > +VHOST_USER_GET_CONFIG = 24,
> > > +VHOST_USER_SET_CONFIG = 25,
> > >  VHOST_USER_CRYPTO_CREATE_SESS = 26,
> > >  VHOST_USER_CRYPTO_CLOSE_SESS = 27,
> > >  VHOST_USER_POSTCOPY_ADVISE = 28,
> > > @@ -125,6 +127,16 @@
> > >  uint16_t queue_size;
> > >  } VhostUserInflight;
> > >
> > > +#define VHOST_USER_MAX_CONFIG_SIZE256
> > > +
> > > +/** Get/set config msg payload */
> > > +struct vhost_user_config {
> > > +uint32_t offset;
> > > +uint32_t size;
> > > +uint32_t flags;
> > > +uint8_t region[VHOST_USER_MAX_CONFIG_SIZE];
> > > +};
> > > +
> > >  typedef struct VhostUserMsg {
> > >  union {
> > >  uint32_t master; /* a VhostUserRequest value */ @@ -148,6
> > +160,7 @@
> > >  VhostUserCryptoSessionParam crypto_session;
> > >  VhostUserVringArea area;
> > >  VhostUserInflight inflight;
> > > +struct vhost_user_config cfg;
> > >  } payload;
> > >  /* Nothing should be added after the payload */  } __rte_packed
> > > VhostUserMsg;
> > > --
> > > 1.8.3.1
> >
>