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Diffstat (limited to 'net/core/dev.c')
-rw-r--r--net/core/dev.c158
1 files changed, 62 insertions, 96 deletions
diff --git a/net/core/dev.c b/net/core/dev.c
index c29f3e1db3ca..69a3e544676c 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -758,29 +758,43 @@ struct net_device *dev_get_by_name_rcu(struct net *net, const char *name)
}
EXPORT_SYMBOL(dev_get_by_name_rcu);
+/* Deprecated for new users, call netdev_get_by_name() instead */
+struct net_device *dev_get_by_name(struct net *net, const char *name)
+{
+ struct net_device *dev;
+
+ rcu_read_lock();
+ dev = dev_get_by_name_rcu(net, name);
+ dev_hold(dev);
+ rcu_read_unlock();
+ return dev;
+}
+EXPORT_SYMBOL(dev_get_by_name);
+
/**
- * dev_get_by_name - find a device by its name
+ * netdev_get_by_name() - find a device by its name
* @net: the applicable net namespace
* @name: name to find
+ * @tracker: tracking object for the acquired reference
+ * @gfp: allocation flags for the tracker
*
* Find an interface by name. This can be called from any
* context and does its own locking. The returned handle has
- * the usage count incremented and the caller must use dev_put() to
+ * the usage count incremented and the caller must use netdev_put() to
* release it when it is no longer needed. %NULL is returned if no
* matching device is found.
*/
-
-struct net_device *dev_get_by_name(struct net *net, const char *name)
+struct net_device *netdev_get_by_name(struct net *net, const char *name,
+ netdevice_tracker *tracker, gfp_t gfp)
{
struct net_device *dev;
- rcu_read_lock();
- dev = dev_get_by_name_rcu(net, name);
- dev_hold(dev);
- rcu_read_unlock();
+ dev = dev_get_by_name(net, name);
+ if (dev)
+ netdev_tracker_alloc(dev, tracker, gfp);
return dev;
}
-EXPORT_SYMBOL(dev_get_by_name);
+EXPORT_SYMBOL(netdev_get_by_name);
/**
* __dev_get_by_index - find a device by its ifindex
@@ -831,29 +845,42 @@ struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex)
}
EXPORT_SYMBOL(dev_get_by_index_rcu);
+/* Deprecated for new users, call netdev_get_by_index() instead */
+struct net_device *dev_get_by_index(struct net *net, int ifindex)
+{
+ struct net_device *dev;
+
+ rcu_read_lock();
+ dev = dev_get_by_index_rcu(net, ifindex);
+ dev_hold(dev);
+ rcu_read_unlock();
+ return dev;
+}
+EXPORT_SYMBOL(dev_get_by_index);
/**
- * dev_get_by_index - find a device by its ifindex
+ * netdev_get_by_index() - find a device by its ifindex
* @net: the applicable net namespace
* @ifindex: index of device
+ * @tracker: tracking object for the acquired reference
+ * @gfp: allocation flags for the tracker
*
* Search for an interface by index. Returns NULL if the device
* is not found or a pointer to the device. The device returned has
* had a reference added and the pointer is safe until the user calls
- * dev_put to indicate they have finished with it.
+ * netdev_put() to indicate they have finished with it.
*/
-
-struct net_device *dev_get_by_index(struct net *net, int ifindex)
+struct net_device *netdev_get_by_index(struct net *net, int ifindex,
+ netdevice_tracker *tracker, gfp_t gfp)
{
struct net_device *dev;
- rcu_read_lock();
- dev = dev_get_by_index_rcu(net, ifindex);
- dev_hold(dev);
- rcu_read_unlock();
+ dev = dev_get_by_index(net, ifindex);
+ if (dev)
+ netdev_tracker_alloc(dev, tracker, gfp);
return dev;
}
-EXPORT_SYMBOL(dev_get_by_index);
+EXPORT_SYMBOL(netdev_get_by_index);
/**
* dev_get_by_napi_id - find a device by napi_id
@@ -3209,7 +3236,7 @@ static u16 skb_tx_hash(const struct net_device *dev,
return (u16) reciprocal_scale(skb_get_hash(skb), qcount) + qoffset;
}
-static void skb_warn_bad_offload(const struct sk_buff *skb)
+void skb_warn_bad_offload(const struct sk_buff *skb)
{
static const netdev_features_t null_features;
struct net_device *dev = skb->dev;
@@ -3338,74 +3365,6 @@ __be16 skb_network_protocol(struct sk_buff *skb, int *depth)
return vlan_get_protocol_and_depth(skb, type, depth);
}
-/* openvswitch calls this on rx path, so we need a different check.
- */
-static inline bool skb_needs_check(struct sk_buff *skb, bool tx_path)
-{
- if (tx_path)
- return skb->ip_summed != CHECKSUM_PARTIAL &&
- skb->ip_summed != CHECKSUM_UNNECESSARY;
-
- return skb->ip_summed == CHECKSUM_NONE;
-}
-
-/**
- * __skb_gso_segment - Perform segmentation on skb.
- * @skb: buffer to segment
- * @features: features for the output path (see dev->features)
- * @tx_path: whether it is called in TX path
- *
- * This function segments the given skb and returns a list of segments.
- *
- * It may return NULL if the skb requires no segmentation. This is
- * only possible when GSO is used for verifying header integrity.
- *
- * Segmentation preserves SKB_GSO_CB_OFFSET bytes of previous skb cb.
- */
-struct sk_buff *__skb_gso_segment(struct sk_buff *skb,
- netdev_features_t features, bool tx_path)
-{
- struct sk_buff *segs;
-
- if (unlikely(skb_needs_check(skb, tx_path))) {
- int err;
-
- /* We're going to init ->check field in TCP or UDP header */
- err = skb_cow_head(skb, 0);
- if (err < 0)
- return ERR_PTR(err);
- }
-
- /* Only report GSO partial support if it will enable us to
- * support segmentation on this frame without needing additional
- * work.
- */
- if (features & NETIF_F_GSO_PARTIAL) {
- netdev_features_t partial_features = NETIF_F_GSO_ROBUST;
- struct net_device *dev = skb->dev;
-
- partial_features |= dev->features & dev->gso_partial_features;
- if (!skb_gso_ok(skb, features | partial_features))
- features &= ~NETIF_F_GSO_PARTIAL;
- }
-
- BUILD_BUG_ON(SKB_GSO_CB_OFFSET +
- sizeof(*SKB_GSO_CB(skb)) > sizeof(skb->cb));
-
- SKB_GSO_CB(skb)->mac_offset = skb_headroom(skb);
- SKB_GSO_CB(skb)->encap_level = 0;
-
- skb_reset_mac_header(skb);
- skb_reset_mac_len(skb);
-
- segs = skb_mac_gso_segment(skb, features);
-
- if (segs != skb && unlikely(skb_needs_check(skb, tx_path) && !IS_ERR(segs)))
- skb_warn_bad_offload(skb);
-
- return segs;
-}
-EXPORT_SYMBOL(__skb_gso_segment);
/* Take action when hardware reception checksum errors are detected. */
#ifdef CONFIG_BUG
@@ -6199,7 +6158,8 @@ restart:
if (!napi)
goto out;
- preempt_disable();
+ if (!IS_ENABLED(CONFIG_PREEMPT_RT))
+ preempt_disable();
for (;;) {
int work = 0;
@@ -6241,7 +6201,8 @@ count:
if (unlikely(need_resched())) {
if (napi_poll)
busy_poll_stop(napi, have_poll_lock, prefer_busy_poll, budget);
- preempt_enable();
+ if (!IS_ENABLED(CONFIG_PREEMPT_RT))
+ preempt_enable();
rcu_read_unlock();
cond_resched();
if (loop_end(loop_end_arg, start_time))
@@ -6252,7 +6213,8 @@ count:
}
if (napi_poll)
busy_poll_stop(napi, have_poll_lock, prefer_busy_poll, budget);
- preempt_enable();
+ if (!IS_ENABLED(CONFIG_PREEMPT_RT))
+ preempt_enable();
out:
rcu_read_unlock();
}
@@ -8822,9 +8784,11 @@ int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa,
err = dev_pre_changeaddr_notify(dev, sa->sa_data, extack);
if (err)
return err;
- err = ops->ndo_set_mac_address(dev, sa);
- if (err)
- return err;
+ if (memcmp(dev->dev_addr, sa->sa_data, dev->addr_len)) {
+ err = ops->ndo_set_mac_address(dev, sa);
+ if (err)
+ return err;
+ }
dev->addr_assign_type = NET_ADDR_SET;
call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
add_device_randomness(dev->dev_addr, dev->addr_len);
@@ -10570,8 +10534,10 @@ void netdev_sw_irq_coalesce_default_on(struct net_device *dev)
{
WARN_ON(dev->reg_state == NETREG_REGISTERED);
- dev->gro_flush_timeout = 20000;
- dev->napi_defer_hard_irqs = 1;
+ if (!IS_ENABLED(CONFIG_PREEMPT_RT)) {
+ dev->gro_flush_timeout = 20000;
+ dev->napi_defer_hard_irqs = 1;
+ }
}
EXPORT_SYMBOL_GPL(netdev_sw_irq_coalesce_default_on);
@@ -10632,7 +10598,7 @@ struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
dev = PTR_ALIGN(p, NETDEV_ALIGN);
dev->padded = (char *)dev - (char *)p;
- ref_tracker_dir_init(&dev->refcnt_tracker, 128);
+ ref_tracker_dir_init(&dev->refcnt_tracker, 128, name);
#ifdef CONFIG_PCPU_DEV_REFCNT
dev->pcpu_refcnt = alloc_percpu(int);
if (!dev->pcpu_refcnt)
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