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Date: Thu, 1 Jun 2023 07:53:25 +0000
From: Bobby Eshleman <bobbyeshleman@...il.com>
To: Simon Horman <simon.horman@...igine.com>
Cc: Bobby Eshleman <bobby.eshleman@...edance.com>,
Stefan Hajnoczi <stefanha@...hat.com>,
Stefano Garzarella <sgarzare@...hat.com>,
"Michael S. Tsirkin" <mst@...hat.com>,
Jason Wang <jasowang@...hat.com>,
"David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
"K. Y. Srinivasan" <kys@...rosoft.com>,
Haiyang Zhang <haiyangz@...rosoft.com>,
Wei Liu <wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>,
Bryan Tan <bryantan@...are.com>, Vishnu Dasa <vdasa@...are.com>,
VMware PV-Drivers Reviewers <pv-drivers@...are.com>,
kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-hyperv@...r.kernel.org
Subject: Re: [PATCH RFC net-next v3 1/8] vsock/dgram: generalize recvmsg and
drop transport->dgram_dequeue
On Wed, May 31, 2023 at 05:56:48PM +0200, Simon Horman wrote:
> On Wed, May 31, 2023 at 12:35:05AM +0000, Bobby Eshleman wrote:
> > This commit drops the transport->dgram_dequeue callback and makes
> > vsock_dgram_recvmsg() generic. It also adds additional transport
> > callbacks for use by the generic vsock_dgram_recvmsg(), such as for
> > parsing skbs for CID/port which vary in format per transport.
> >
> > Signed-off-by: Bobby Eshleman <bobby.eshleman@...edance.com>
>
> ...
>
> > diff --git a/net/vmw_vsock/vmci_transport.c b/net/vmw_vsock/vmci_transport.c
> > index b370070194fa..b6a51afb74b8 100644
> > --- a/net/vmw_vsock/vmci_transport.c
> > +++ b/net/vmw_vsock/vmci_transport.c
> > @@ -1731,57 +1731,40 @@ static int vmci_transport_dgram_enqueue(
> > return err - sizeof(*dg);
> > }
> >
> > -static int vmci_transport_dgram_dequeue(struct vsock_sock *vsk,
> > - struct msghdr *msg, size_t len,
> > - int flags)
> > +int vmci_transport_dgram_get_cid(struct sk_buff *skb, unsigned int *cid)
> > {
> > - int err;
> > struct vmci_datagram *dg;
> > - size_t payload_len;
> > - struct sk_buff *skb;
> >
> > - if (flags & MSG_OOB || flags & MSG_ERRQUEUE)
> > - return -EOPNOTSUPP;
> > + dg = (struct vmci_datagram *)skb->data;
> > + if (!dg)
> > + return -EINVAL;
> >
> > - /* Retrieve the head sk_buff from the socket's receive queue. */
> > - err = 0;
> > - skb = skb_recv_datagram(&vsk->sk, flags, &err);
> > - if (!skb)
> > - return err;
> > + *cid = dg->src.context;
> > + return 0;
> > +}
>
> Hi Bobby,
>
> clang-16 with W=1 seems a bit unhappy about this.
>
> net/vmw_vsock/vmci_transport.c:1734:5: warning: no previous prototype for function 'vmci_transport_dgram_get_cid' [-Wmissing-prototypes]
> int vmci_transport_dgram_get_cid(struct sk_buff *skb, unsigned int *cid)
> ^
> net/vmw_vsock/vmci_transport.c:1734:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
> int vmci_transport_dgram_get_cid(struct sk_buff *skb, unsigned int *cid)
> ^
> static
> net/vmw_vsock/vmci_transport.c:1746:5: warning: no previous prototype for function 'vmci_transport_dgram_get_port' [-Wmissing-prototypes]
> int vmci_transport_dgram_get_port(struct sk_buff *skb, unsigned int *port)
> ^
> net/vmw_vsock/vmci_transport.c:1746:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
> int vmci_transport_dgram_get_port(struct sk_buff *skb, unsigned int *port)
> ^
> static
> net/vmw_vsock/vmci_transport.c:1758:5: warning: no previous prototype for function 'vmci_transport_dgram_get_length' [-Wmissing-prototypes]
> int vmci_transport_dgram_get_length(struct sk_buff *skb, size_t *len)
> ^
> net/vmw_vsock/vmci_transport.c:1758:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
> int vmci_transport_dgram_get_length(struct sk_buff *skb, size_t *len)
> ^
>
> I see similar warnings for net/vmw_vsock/af_vsock.c in patch 4/8.
>
> > +
> > +int vmci_transport_dgram_get_port(struct sk_buff *skb, unsigned int *port)
> > +{
> > + struct vmci_datagram *dg;
> >
> > dg = (struct vmci_datagram *)skb->data;
> > if (!dg)
> > - /* err is 0, meaning we read zero bytes. */
> > - goto out;
> > -
> > - payload_len = dg->payload_size;
> > - /* Ensure the sk_buff matches the payload size claimed in the packet. */
> > - if (payload_len != skb->len - sizeof(*dg)) {
> > - err = -EINVAL;
> > - goto out;
> > - }
> > + return -EINVAL;
> >
> > - if (payload_len > len) {
> > - payload_len = len;
> > - msg->msg_flags |= MSG_TRUNC;
> > - }
> > + *port = dg->src.resource;
> > + return 0;
> > +}
> >
> > - /* Place the datagram payload in the user's iovec. */
> > - err = skb_copy_datagram_msg(skb, sizeof(*dg), msg, payload_len);
> > - if (err)
> > - goto out;
> > +int vmci_transport_dgram_get_length(struct sk_buff *skb, size_t *len)
> > +{
> > + struct vmci_datagram *dg;
> >
> > - if (msg->msg_name) {
> > - /* Provide the address of the sender. */
> > - DECLARE_SOCKADDR(struct sockaddr_vm *, vm_addr, msg->msg_name);
> > - vsock_addr_init(vm_addr, dg->src.context, dg->src.resource);
> > - msg->msg_namelen = sizeof(*vm_addr);
> > - }
> > - err = payload_len;
> > + dg = (struct vmci_datagram *)skb->data;
> > + if (!dg)
> > + return -EINVAL;
> >
> > -out:
> > - skb_free_datagram(&vsk->sk, skb);
> > - return err;
> > + *len = dg->payload_size;
> > + return 0;
> > }
> >
> > static bool vmci_transport_dgram_allow(u32 cid, u32 port)
>
> ...
Thanks for the review! Your feedback from both emails will be
incorporated in the next rev (with C=1 and W=1 output clearing).
Thanks again,
Bobby
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