Make sure that if a feature flag is disabled by ethtool on netback
that we do not gratuitously re-enabled it when we check the frontend
features during ring connection.
Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx>
Cc: Ian Campbell <ian.campbell@xxxxxxxxxx>
---
drivers/xen/netback/common.h | 15 ++++++---
drivers/xen/netback/interface.c | 68 ++++++++++++++++++++++++++++++--------
drivers/xen/netback/netback.c | 2 +-
drivers/xen/netback/xenbus.c | 51 +++++++++++------------------
4 files changed, 83 insertions(+), 53 deletions(-)
diff --git a/drivers/xen/netback/common.h b/drivers/xen/netback/common.h
index 1cbc4ff..a673331 100644
--- a/drivers/xen/netback/common.h
+++ b/drivers/xen/netback/common.h
@@ -76,14 +76,18 @@ struct xen_netif {
struct vm_struct *tx_comms_area;
struct vm_struct *rx_comms_area;
- /* Set of features that can be turned on in dev->features. */
- int features;
+ /* Flags that must not be set in dev->features */
+ int features_disabled;
- int smart_poll;
+ /* Frontend feature information. */
+ u8 can_sg:1;
+ u8 gso:1;
+ u8 gso_prefix:1;
+ u8 csum:1;
+ u8 smart_poll:1;
/* Internal feature information. */
u8 can_queue:1; /* can queue packets for receiver? */
- u8 gso_prefix:1; /* use a prefix segment for GSO information */
/* Allow netif_be_start_xmit() to peek ahead in the rx request
* ring. This is a prediction of what rx_req_cons will be once
@@ -189,6 +193,7 @@ void netif_accel_init(void);
void netif_disconnect(struct xen_netif *netif);
+void netif_set_features(struct xen_netif *netif);
struct xen_netif *netif_alloc(struct device *parent, domid_t domid, unsigned
int handle);
int netif_map(struct xen_netif *netif, unsigned long tx_ring_ref,
unsigned long rx_ring_ref, unsigned int evtchn);
@@ -225,7 +230,7 @@ static inline int netbk_can_queue(struct net_device *dev)
static inline int netbk_can_sg(struct net_device *dev)
{
struct xen_netif *netif = netdev_priv(dev);
- return netif->features & NETIF_F_SG;
+ return netif->can_sg;
}
struct pending_tx_info {
diff --git a/drivers/xen/netback/interface.c b/drivers/xen/netback/interface.c
index 172ef4c..2e8508a 100644
--- a/drivers/xen/netback/interface.c
+++ b/drivers/xen/netback/interface.c
@@ -121,31 +121,69 @@ static int netbk_change_mtu(struct net_device *dev, int
mtu)
return 0;
}
-static int netbk_set_sg(struct net_device *dev, u32 data)
+void netif_set_features(struct xen_netif *netif)
{
- if (data) {
- struct xen_netif *netif = netdev_priv(dev);
+ struct net_device *dev = netif->dev;
+ int features = dev->features;
+
+ if (netif->can_sg)
+ features |= NETIF_F_SG;
+ if (netif->gso || netif->gso_prefix)
+ features |= NETIF_F_TSO;
+ if (netif->csum)
+ features |= NETIF_F_IP_CSUM;
+
+ features &= ~(netif->features_disabled);
- if (!(netif->features & NETIF_F_SG))
+ if (!(features & NETIF_F_SG) && dev->mtu > ETH_DATA_LEN)
+ dev->mtu = ETH_DATA_LEN;
+
+ dev->features = features;
+}
+
+static int netbk_set_tx_csum(struct net_device *dev, u32 data)
+{
+ struct xen_netif *netif = netdev_priv(dev);
+ if (data) {
+ if (!netif->csum)
return -ENOSYS;
+ netif->features_disabled &= ~NETIF_F_IP_CSUM;
+ } else {
+ netif->features_disabled |= NETIF_F_IP_CSUM;
}
- if (dev->mtu > ETH_DATA_LEN)
- dev->mtu = ETH_DATA_LEN;
+ netif_set_features(netif);
+ return 0;
+}
- return ethtool_op_set_sg(dev, data);
+static int netbk_set_sg(struct net_device *dev, u32 data)
+{
+ struct xen_netif *netif = netdev_priv(dev);
+ if (data) {
+ if (!netif->can_sg)
+ return -ENOSYS;
+ netif->features_disabled &= ~NETIF_F_SG;
+ } else {
+ netif->features_disabled |= NETIF_F_SG;
+ }
+
+ netif_set_features(netif);
+ return 0;
}
static int netbk_set_tso(struct net_device *dev, u32 data)
{
+ struct xen_netif *netif = netdev_priv(dev);
if (data) {
- struct xen_netif *netif = netdev_priv(dev);
-
- if (!(netif->features & NETIF_F_TSO))
+ if (!netif->gso && !netif->gso_prefix)
return -ENOSYS;
+ netif->features_disabled &= ~NETIF_F_TSO;
+ } else {
+ netif->features_disabled |= NETIF_F_TSO;
}
- return ethtool_op_set_tso(dev, data);
+ netif_set_features(netif);
+ return 0;
}
static void netbk_get_drvinfo(struct net_device *dev,
@@ -200,7 +238,7 @@ static struct ethtool_ops network_ethtool_ops =
.get_drvinfo = netbk_get_drvinfo,
.get_tx_csum = ethtool_op_get_tx_csum,
- .set_tx_csum = ethtool_op_set_tx_csum,
+ .set_tx_csum = netbk_set_tx_csum,
.get_sg = ethtool_op_get_sg,
.set_sg = netbk_set_sg,
.get_tso = ethtool_op_get_tso,
@@ -242,7 +280,8 @@ struct xen_netif *netif_alloc(struct device *parent,
domid_t domid, unsigned int
netif->domid = domid;
netif->group = -1;
netif->handle = handle;
- netif->features = NETIF_F_SG;
+ netif->can_sg = 1;
+ netif->csum = 1;
atomic_set(&netif->refcnt, 1);
init_waitqueue_head(&netif->waiting_to_free);
netif->dev = dev;
@@ -259,8 +298,7 @@ struct xen_netif *netif_alloc(struct device *parent,
domid_t domid, unsigned int
init_timer(&netif->tx_queue_timeout);
dev->netdev_ops = &netback_ops;
- dev->features = NETIF_F_IP_CSUM|NETIF_F_SG;
-
+ netif_set_features(netif);
SET_ETHTOOL_OPS(dev, &network_ethtool_ops);
dev->tx_queue_len = netbk_queue_length;
diff --git a/drivers/xen/netback/netback.c b/drivers/xen/netback/netback.c
index 93f0686..426aada 100644
--- a/drivers/xen/netback/netback.c
+++ b/drivers/xen/netback/netback.c
@@ -238,7 +238,7 @@ static struct sk_buff *netbk_copy_skb(struct sk_buff *skb)
static inline int netbk_max_required_rx_slots(struct xen_netif *netif)
{
- if (netif->features & (NETIF_F_SG|NETIF_F_TSO))
+ if (netif->can_sg || netif->gso || netif->gso_prefix)
return MAX_SKB_FRAGS + 2; /* header + extra_info + frags */
return 1; /* all in one */
}
diff --git a/drivers/xen/netback/xenbus.c b/drivers/xen/netback/xenbus.c
index 74c035b..81b3a96 100644
--- a/drivers/xen/netback/xenbus.c
+++ b/drivers/xen/netback/xenbus.c
@@ -412,6 +412,7 @@ static void connect(struct backend_info *be)
static int connect_rings(struct backend_info *be)
{
+ struct xen_netif *netif = be->netif;
struct xenbus_device *dev = be->dev;
unsigned long tx_ring_ref, rx_ring_ref;
unsigned int evtchn, rx_copy;
@@ -445,61 +446,47 @@ static int connect_rings(struct backend_info *be)
if (!rx_copy)
return -EOPNOTSUPP;
- if (be->netif->dev->tx_queue_len != 0) {
+ if (netif->dev->tx_queue_len != 0) {
if (xenbus_scanf(XBT_NIL, dev->otherend,
"feature-rx-notify", "%d", &val) < 0)
val = 0;
if (val)
- be->netif->can_queue = 1;
+ netif->can_queue = 1;
else
/* Must be non-zero for pfifo_fast to work. */
- be->netif->dev->tx_queue_len = 1;
+ netif->dev->tx_queue_len = 1;
}
- if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-sg", "%d", &val) < 0)
+ if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-sg",
+ "%d", &val) < 0)
val = 0;
- if (!val) {
- be->netif->features &= ~NETIF_F_SG;
- be->netif->dev->features &= ~NETIF_F_SG;
- if (be->netif->dev->mtu > ETH_DATA_LEN)
- be->netif->dev->mtu = ETH_DATA_LEN;
- }
+ netif->can_sg = !!val;
if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-gso-tcpv4",
- "%d", &val) < 0)
+ "%d", &val) < 0)
val = 0;
- if (val) {
- be->netif->features |= NETIF_F_TSO;
- be->netif->dev->features |= NETIF_F_TSO;
- }
+ netif->gso = !!val;
if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-gso-tcpv4-prefix",
- "%d", &val) < 0)
+ "%d", &val) < 0)
val = 0;
- if (val) {
- be->netif->features |= NETIF_F_TSO;
- be->netif->dev->features |= NETIF_F_TSO;
- be->netif->gso_prefix = 1;
- }
+ netif->gso_prefix = !!val;
if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-no-csum-offload",
- "%d", &val) < 0)
+ "%d", &val) < 0)
val = 0;
- if (val) {
- be->netif->features &= ~NETIF_F_IP_CSUM;
- be->netif->dev->features &= ~NETIF_F_IP_CSUM;
- }
+ netif->csum = !!val;
if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-smart-poll",
- "%d", &val) < 0)
+ "%d", &val) < 0)
val = 0;
- if (val)
- be->netif->smart_poll = 1;
- else
- be->netif->smart_poll = 0;
+ netif->smart_poll = !!val;
+
+ /* Set dev->features */
+ netif_set_features(netif);
/* Map the shared frame, irq etc. */
- err = netif_map(be->netif, tx_ring_ref, rx_ring_ref, evtchn);
+ err = netif_map(netif, tx_ring_ref, rx_ring_ref, evtchn);
if (err) {
xenbus_dev_fatal(dev, err,
"mapping shared-frames %lu/%lu port %u",
--
1.5.6.5
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