CC'ing virtio-dev@xxxxxxxxxxxxxxxxxxxx On Mon, Aug 15, 2022 at 10:56:05AM -0700, Bobby Eshleman wrote: > This commit allows vsock implementations to return errors > to the socket layer other than -ENOMEM. One immediate effect > of this is that upon the sk_sndbuf threshold being reached -EAGAIN > will be returned and userspace may throttle appropriately. > > Resultingly, a known issue with uperf is resolved[1]. > > Additionally, to preserve legacy behavior for non-virtio > implementations, hyperv/vmci force errors to be -ENOMEM so that behavior > is unchanged. > > [1]: https://gitlab.com/vsock/vsock/-/issues/1 > > Signed-off-by: Bobby Eshleman <bobby.eshleman@xxxxxxxxxxxxx> > --- > include/linux/virtio_vsock.h | 3 +++ > net/vmw_vsock/af_vsock.c | 3 ++- > net/vmw_vsock/hyperv_transport.c | 2 +- > net/vmw_vsock/virtio_transport_common.c | 3 --- > net/vmw_vsock/vmci_transport.c | 9 ++++++++- > 5 files changed, 14 insertions(+), 6 deletions(-) > > diff --git a/include/linux/virtio_vsock.h b/include/linux/virtio_vsock.h > index 17ed01466875..9a37eddbb87a 100644 > --- a/include/linux/virtio_vsock.h > +++ b/include/linux/virtio_vsock.h > @@ -8,6 +8,9 @@ > #include <net/sock.h> > #include <net/af_vsock.h> > > +/* Threshold for detecting small packets to copy */ > +#define GOOD_COPY_LEN 128 > + > enum virtio_vsock_metadata_flags { > VIRTIO_VSOCK_METADATA_FLAGS_REPLY = BIT(0), > VIRTIO_VSOCK_METADATA_FLAGS_TAP_DELIVERED = BIT(1), > diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c > index e348b2d09eac..1893f8aafa48 100644 > --- a/net/vmw_vsock/af_vsock.c > +++ b/net/vmw_vsock/af_vsock.c > @@ -1844,8 +1844,9 @@ static int vsock_connectible_sendmsg(struct socket *sock, struct msghdr *msg, > written = transport->stream_enqueue(vsk, > msg, len - total_written); > } > + > if (written < 0) { > - err = -ENOMEM; > + err = written; > goto out_err; > } > > diff --git a/net/vmw_vsock/hyperv_transport.c b/net/vmw_vsock/hyperv_transport.c > index fd98229e3db3..e99aea571f6f 100644 > --- a/net/vmw_vsock/hyperv_transport.c > +++ b/net/vmw_vsock/hyperv_transport.c > @@ -687,7 +687,7 @@ static ssize_t hvs_stream_enqueue(struct vsock_sock *vsk, struct msghdr *msg, > if (bytes_written) > ret = bytes_written; > kfree(send_buf); > - return ret; > + return ret < 0 ? -ENOMEM : ret; > } > > static s64 hvs_stream_has_data(struct vsock_sock *vsk) > diff --git a/net/vmw_vsock/virtio_transport_common.c b/net/vmw_vsock/virtio_transport_common.c > index 920578597bb9..d5780599fe93 100644 > --- a/net/vmw_vsock/virtio_transport_common.c > +++ b/net/vmw_vsock/virtio_transport_common.c > @@ -23,9 +23,6 @@ > /* How long to wait for graceful shutdown of a connection */ > #define VSOCK_CLOSE_TIMEOUT (8 * HZ) > > -/* Threshold for detecting small packets to copy */ > -#define GOOD_COPY_LEN 128 > - > static const struct virtio_transport * > virtio_transport_get_ops(struct vsock_sock *vsk) > { > diff --git a/net/vmw_vsock/vmci_transport.c b/net/vmw_vsock/vmci_transport.c > index b14f0ed7427b..c927a90dc859 100644 > --- a/net/vmw_vsock/vmci_transport.c > +++ b/net/vmw_vsock/vmci_transport.c > @@ -1838,7 +1838,14 @@ static ssize_t vmci_transport_stream_enqueue( > struct msghdr *msg, > size_t len) > { > - return vmci_qpair_enquev(vmci_trans(vsk)->qpair, msg, len, 0); > + int err; > + > + err = vmci_qpair_enquev(vmci_trans(vsk)->qpair, msg, len, 0); > + > + if (err < 0) > + err = -ENOMEM; > + > + return err; > } > > static s64 vmci_transport_stream_has_data(struct vsock_sock *vsk) > -- > 2.35.1 >
