static int read_xenbus_vif_flags(struct backend_info *be)
{
struct xenvif *vif = be->vif;
struct xenbus_device *dev = be->dev;
unsigned int rx_copy;
int err;
err = xenbus_scanf(XBT_NIL, dev->otherend, "request-rx-copy", "%u",
&rx_copy);
if (err == -ENOENT) {
err = 0;
rx_copy = 0;
}
if (err < 0) {
xenbus_dev_fatal(dev, err, "reading %s/request-rx-copy",
dev->otherend);
return err;
}
if (!rx_copy)
return -EOPNOTSUPP;
if (!xenbus_read_unsigned(dev->otherend, "feature-rx-notify", 0)) {
/* - Reduce drain timeout to poll more frequently for
* Rx requests.
* - Disable Rx stall detection.
*/
be->vif->drain_timeout = msecs_to_jiffies(30);
be->vif->stall_timeout = 0;
}
vif->can_sg = !!xenbus_read_unsigned(dev->otherend, "feature-sg", 0);
vif->gso_mask = 0;
if (xenbus_read_unsigned(dev->otherend, "feature-gso-tcpv4", 0))
vif->gso_mask |= GSO_BIT(TCPV4);
if (xenbus_read_unsigned(dev->otherend, "feature-gso-tcpv6", 0))
vif->gso_mask |= GSO_BIT(TCPV6);
vif->ip_csum = !xenbus_read_unsigned(dev->otherend,
"feature-no-csum-offload", 0);
vif->ipv6_csum = !!xenbus_read_unsigned(dev->otherend,
"feature-ipv6-csum-offload", 0);
return 0;
}
static netdev_features_t xenvif_fix_features(struct net_device *dev,
netdev_features_t features)
{
struct xenvif *vif = netdev_priv(dev);
if (!vif->can_sg)
features &= ~NETIF_F_SG;
if (~(vif->gso_mask) & GSO_BIT(TCPV4))
features &= ~NETIF_F_TSO;
if (~(vif->gso_mask) & GSO_BIT(TCPV6))
features &= ~NETIF_F_TSO6;
if (!vif->ip_csum)
features &= ~NETIF_F_IP_CSUM;
if (!vif->ipv6_csum)
features &= ~NETIF_F_IPV6_CSUM;
return features;
}
static int read_xenbus_vif_flags(struct backend_info *be)
{
struct xenvif *vif = be->vif;
struct xenbus_device *dev = be->dev;
unsigned int rx_copy;
int err, val;
err = xenbus_scanf(XBT_NIL, dev->otherend, "request-rx-copy", "%u",
&rx_copy);
if (err == -ENOENT) {
err = 0;
rx_copy = 0;
}
if (err < 0) {
xenbus_dev_fatal(dev, err, "reading %s/request-rx-copy",
dev->otherend);
return err;
}
if (!rx_copy)
return -EOPNOTSUPP;
if (xenbus_scanf(XBT_NIL, dev->otherend,
"feature-rx-notify", "%d", &val) < 0 || val == 0) {
xenbus_dev_fatal(dev, -EINVAL, "feature-rx-notify is mandatory");
return -EINVAL;
}
if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-sg",
"%d", &val) < 0)
val = 0;
vif->can_sg = !!val;
vif->gso_mask = 0;
vif->gso_prefix_mask = 0;
if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-gso-tcpv4",
"%d", &val) < 0)
val = 0;
if (val)
vif->gso_mask |= GSO_BIT(TCPV4);
if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-gso-tcpv4-prefix",
"%d", &val) < 0)
val = 0;
if (val)
vif->gso_prefix_mask |= GSO_BIT(TCPV4);
if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-gso-tcpv6",
"%d", &val) < 0)
val = 0;
if (val)
vif->gso_mask |= GSO_BIT(TCPV6);
if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-gso-tcpv6-prefix",
"%d", &val) < 0)
val = 0;
if (val)
vif->gso_prefix_mask |= GSO_BIT(TCPV6);
if (vif->gso_mask & vif->gso_prefix_mask) {
xenbus_dev_fatal(dev, err,
"%s: gso and gso prefix flags are not "
"mutually exclusive",
dev->otherend);
return -EOPNOTSUPP;
}
if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-no-csum-offload",
"%d", &val) < 0)
val = 0;
vif->ip_csum = !val;
if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-ipv6-csum-offload",
"%d", &val) < 0)
val = 0;
vif->ipv6_csum = !!val;
return 0;
}
static int connect_rings(struct backend_info *be)
{
struct xenvif *vif = be->vif;
struct xenbus_device *dev = be->dev;
unsigned long tx_ring_ref, rx_ring_ref;
unsigned int tx_evtchn, rx_evtchn, rx_copy;
int err;
int val;
err = xenbus_gather(XBT_NIL, dev->otherend,
"tx-ring-ref", "%lu", &tx_ring_ref,
"rx-ring-ref", "%lu", &rx_ring_ref, NULL);
if (err) {
xenbus_dev_fatal(dev, err,
"reading %s/ring-ref",
dev->otherend);
return err;
}
/* Try split event channels first, then single event channel. */
err = xenbus_gather(XBT_NIL, dev->otherend,
"event-channel-tx", "%u", &tx_evtchn,
"event-channel-rx", "%u", &rx_evtchn, NULL);
if (err < 0) {
err = xenbus_scanf(XBT_NIL, dev->otherend,
"event-channel", "%u", &tx_evtchn);
if (err < 0) {
xenbus_dev_fatal(dev, err,
"reading %s/event-channel(-tx/rx)",
dev->otherend);
return err;
}
rx_evtchn = tx_evtchn;
}
err = xenbus_scanf(XBT_NIL, dev->otherend, "request-rx-copy", "%u",
&rx_copy);
if (err == -ENOENT) {
err = 0;
rx_copy = 0;
}
if (err < 0) {
xenbus_dev_fatal(dev, err, "reading %s/request-rx-copy",
dev->otherend);
return err;
}
if (!rx_copy)
return -EOPNOTSUPP;
if (vif->dev->tx_queue_len != 0) {
if (xenbus_scanf(XBT_NIL, dev->otherend,
"feature-rx-notify", "%d", &val) < 0)
val = 0;
if (val)
vif->can_queue = 1;
else
/* Must be non-zero for pfifo_fast to work. */
vif->dev->tx_queue_len = 1;
}
if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-sg",
"%d", &val) < 0)
val = 0;
vif->can_sg = !!val;
vif->gso_mask = 0;
vif->gso_prefix_mask = 0;
if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-gso-tcpv4",
"%d", &val) < 0)
val = 0;
if (val)
vif->gso_mask |= GSO_BIT(TCPV4);
if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-gso-tcpv4-prefix",
"%d", &val) < 0)
val = 0;
if (val)
vif->gso_prefix_mask |= GSO_BIT(TCPV4);
if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-gso-tcpv6",
"%d", &val) < 0)
val = 0;
if (val)
vif->gso_mask |= GSO_BIT(TCPV6);
if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-gso-tcpv6-prefix",
"%d", &val) < 0)
val = 0;
if (val)
vif->gso_prefix_mask |= GSO_BIT(TCPV6);
if (vif->gso_mask & vif->gso_prefix_mask) {
xenbus_dev_fatal(dev, err,
"%s: gso and gso prefix flags are not "
"mutually exclusive",
dev->otherend);
return -EOPNOTSUPP;
}
if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-no-csum-offload",
"%d", &val) < 0)
val = 0;
vif->ip_csum = !val;
if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-ipv6-csum-offload",
"%d", &val) < 0)
val = 0;
vif->ipv6_csum = !!val;
/* Map the shared frame, irq etc. */
err = xenvif_connect(vif, tx_ring_ref, rx_ring_ref,
tx_evtchn, rx_evtchn);
if (err) {
xenbus_dev_fatal(dev, err,
"mapping shared-frames %lu/%lu port tx %u rx %u",
tx_ring_ref, rx_ring_ref,
tx_evtchn, rx_evtchn);
return err;
}
return 0;
}
static int read_xenbus_vif_flags(struct backend_info *be)
{
struct xenvif *vif = be->vif;
struct xenbus_device *dev = be->dev;
unsigned int rx_copy;
int err, val;
err = xenbus_scanf(XBT_NIL, dev->otherend, "request-rx-copy", "%u",
&rx_copy);
if (err == -ENOENT) {
err = 0;
rx_copy = 0;
}
if (err < 0) {
xenbus_dev_fatal(dev, err, "reading %s/request-rx-copy",
dev->otherend);
return err;
}
if (!rx_copy)
return -EOPNOTSUPP;
if (xenbus_scanf(XBT_NIL, dev->otherend,
"feature-rx-notify", "%d", &val) < 0)
val = 0;
if (!val) {
/* - Reduce drain timeout to poll more frequently for
* Rx requests.
* - Disable Rx stall detection.
*/
be->vif->drain_timeout = msecs_to_jiffies(30);
be->vif->stall_timeout = 0;
}
if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-sg",
"%d", &val) < 0)
val = 0;
vif->can_sg = !!val;
vif->gso_mask = 0;
vif->gso_prefix_mask = 0;
if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-gso-tcpv4",
"%d", &val) < 0)
val = 0;
if (val)
vif->gso_mask |= GSO_BIT(TCPV4);
if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-gso-tcpv4-prefix",
"%d", &val) < 0)
val = 0;
if (val)
vif->gso_prefix_mask |= GSO_BIT(TCPV4);
if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-gso-tcpv6",
"%d", &val) < 0)
val = 0;
if (val)
vif->gso_mask |= GSO_BIT(TCPV6);
if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-gso-tcpv6-prefix",
"%d", &val) < 0)
val = 0;
if (val)
vif->gso_prefix_mask |= GSO_BIT(TCPV6);
if (vif->gso_mask & vif->gso_prefix_mask) {
xenbus_dev_fatal(dev, err,
"%s: gso and gso prefix flags are not "
"mutually exclusive",
dev->otherend);
return -EOPNOTSUPP;
}
if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-no-csum-offload",
"%d", &val) < 0)
val = 0;
vif->ip_csum = !val;
if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-ipv6-csum-offload",
"%d", &val) < 0)
val = 0;
vif->ipv6_csum = !!val;
if (xenbus_scanf(XBT_NIL, dev->otherend, "request-multicast-control",
"%d", &val) < 0)
val = 0;
vif->multicast_control = !!val;
return 0;
}