diff options
Diffstat (limited to 'drivers/net/xen-netback/xenbus.c')
| -rw-r--r-- | drivers/net/xen-netback/xenbus.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/drivers/net/xen-netback/xenbus.c b/drivers/net/xen-netback/xenbus.c index 286054b60d47..7e62a6ee7622 100644 --- a/drivers/net/xen-netback/xenbus.c +++ b/drivers/net/xen-netback/xenbus.c @@ -393,6 +393,24 @@ static void set_backend_state(struct backend_info *be, } } +static void read_xenbus_frontend_xdp(struct backend_info *be, + struct xenbus_device *dev) +{ + struct xenvif *vif = be->vif; + u16 headroom; + int err; + + err = xenbus_scanf(XBT_NIL, dev->otherend, + "xdp-headroom", "%hu", &headroom); + if (err != 1) { + vif->xdp_headroom = 0; + return; + } + if (headroom > XEN_NETIF_MAX_XDP_HEADROOM) + headroom = XEN_NETIF_MAX_XDP_HEADROOM; + vif->xdp_headroom = headroom; +} + /** * Callback received when the frontend's state changes. */ @@ -417,6 +435,11 @@ static void frontend_changed(struct xenbus_device *dev, set_backend_state(be, XenbusStateConnected); break; + case XenbusStateReconfiguring: + read_xenbus_frontend_xdp(be, dev); + xenbus_switch_state(dev, XenbusStateReconfigured); + break; + case XenbusStateClosing: set_backend_state(be, XenbusStateClosing); break; @@ -947,6 +970,8 @@ static int read_xenbus_vif_flags(struct backend_info *be) vif->ipv6_csum = !!xenbus_read_unsigned(dev->otherend, "feature-ipv6-csum-offload", 0); + read_xenbus_frontend_xdp(be, dev); + return 0; } @@ -1036,6 +1061,15 @@ static int netback_probe(struct xenbus_device *dev, goto abort_transaction; } + /* we can adjust a headroom for netfront XDP processing */ + err = xenbus_printf(xbt, dev->nodename, + "feature-xdp-headroom", "%d", + provides_xdp_headroom); + if (err) { + message = "writing feature-xdp-headroom"; + goto abort_transaction; + } + /* We don't support rx-flip path (except old guests who * don't grok this feature flag). */ |