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Subject: [PATCH v2 10/16] vhost-pci-net: send the negotiated feature bits to the master
The slave device actively sends the negotiated feature bits to the master. Signed-off-by: Wei Wang <wei.w.wang@intel.com> --- hw/net/vhost-pci-net.c | 18 ++++++++++++++++++ hw/virtio/vhost-pci-slave.c | 22 ++++++++++++++++++++++ include/hw/virtio/vhost-pci-slave.h | 2 ++ 3 files changed, 42 insertions(+) diff --git a/hw/net/vhost-pci-net.c b/hw/net/vhost-pci-net.c index 0235511..1379204 100644 --- a/hw/net/vhost-pci-net.c +++ b/hw/net/vhost-pci-net.c @@ -181,6 +181,24 @@ static uint64_t vpnet_get_features(VirtIODevice *vdev, uint64_t features, static void vpnet_set_features(VirtIODevice *vdev, uint64_t features) { + /* + * The implementation split the write of the 64-bit "features" into 2 + * 32-bit writes, so the function is called twice. need_send is used to + * detect the second write which finishes the write of "features", and + * need to send to the remote device. + */ + static bool need_send; + int ret; + + if (need_send) { + need_send = 0; + ret = vp_slave_send_feature_bits(features); + if (ret < 0) { + error_report("%s failed to send feature bits", __func__); + } + } else { + need_send = 1; + } } static void vpnet_get_config(VirtIODevice *vdev, uint8_t *config) diff --git a/hw/virtio/vhost-pci-slave.c b/hw/virtio/vhost-pci-slave.c index ab1d06b..6cc9c21 100644 --- a/hw/virtio/vhost-pci-slave.c +++ b/hw/virtio/vhost-pci-slave.c @@ -122,6 +122,28 @@ static void vp_slave_set_features(VhostUserMsg *msg) ~(1 << VHOST_USER_F_PROTOCOL_FEATURES); } +static int vp_slave_send_u64(int request, uint64_t u64) +{ + VhostUserMsg msg = { + .request = request, + .flags = VHOST_USER_VERSION, + .payload.u64 = u64, + .size = sizeof(msg.payload.u64), + }; + + if (vp_slave_write(&vp_slave->chr_be, &msg) < 0) { + error_report("%s: failed to send", __func__); + return -1; + } + + return 0; +} + +int vp_slave_send_feature_bits(uint64_t features) +{ + return vp_slave_send_u64(VHOST_USER_SET_FEATURES, features); +} + static void vp_slave_event(void *opaque, int event) { switch (event) { diff --git a/include/hw/virtio/vhost-pci-slave.h b/include/hw/virtio/vhost-pci-slave.h index b5bf02a..ab21e70 100644 --- a/include/hw/virtio/vhost-pci-slave.h +++ b/include/hw/virtio/vhost-pci-slave.h @@ -56,6 +56,8 @@ extern int vhost_pci_slave_init(QemuOpts *opts); extern int vhost_pci_slave_cleanup(void); +extern int vp_slave_send_feature_bits(uint64_t features); + VhostPCIDev *get_vhost_pci_dev(void); #endif -- 2.7.4
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