* kernel, by Linus Torvalds and others.
*/
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
#include <linux/dcache.h>
#include <linux/etherdevice.h>
#include <linux/if.h>
#include <linux/percpu.h>
#include <linux/rtnetlink.h>
#include <linux/compat.h>
+#include <linux/version.h>
#include "vport.h"
#include "vport-internal_dev.h"
&internal_vport_ops,
&patch_vport_ops,
&gre_vport_ops,
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,26)
+ &capwap_vport_ops,
+#endif
};
static const struct vport_ops **vport_ops_list;
static struct hlist_head *dev_table;
#define VPORT_HASH_BUCKETS 1024
-/* We limit the number of times that we pass through vport_send() to
- * avoid blowing out the stack in the event that we have a loop. There is
- * a separate counter for each CPU for both interrupt and non-interrupt
- * context in order to keep the limit deterministic for a given packet. */
-struct percpu_loop_counter {
- int count[2];
-};
-
-static DEFINE_PER_CPU(struct percpu_loop_counter, vport_loop_counter);
-#define VPORT_MAX_LOOPS 5
-
/* Both RTNL lock and vport_mutex need to be held when updating dev_table.
*
* If you use vport_locate and then perform some operations, you need to hold
mutex_unlock(&vport_mutex);
}
-#define ASSERT_VPORT() do { \
- if (unlikely(!mutex_is_locked(&vport_mutex))) { \
- printk(KERN_ERR "openvswitch: vport lock not held at %s (%d)\n", \
- __FILE__, __LINE__); \
- dump_stack(); \
- } \
-} while(0)
+#define ASSERT_VPORT() \
+do { \
+ if (unlikely(!mutex_is_locked(&vport_mutex))) { \
+ pr_err("vport lock not held at %s (%d)\n", \
+ __FILE__, __LINE__); \
+ dump_stack(); \
+ } \
+} while (0)
/**
* vport_init - initialize vport subsystem
struct hlist_node *node;
if (unlikely(!mutex_is_locked(&vport_mutex) && !rtnl_is_locked())) {
- printk(KERN_ERR "openvswitch: neither RTNL nor vport lock held in vport_locate\n");
+ pr_err("neither RTNL nor vport lock held in vport_locate\n");
dump_stack();
}
if (vport->ops->flags & VPORT_F_GEN_STATS) {
spin_lock_bh(&vport->stats_lock);
- memcpy(&vport->offset_stats, stats, sizeof(struct odp_vport_stats));
+ vport->offset_stats = *stats;
spin_unlock_bh(&vport->stats_lock);
return 0;
spin_lock_bh(&vport->stats_lock);
- memcpy(stats, &vport->offset_stats, sizeof(struct odp_vport_stats));
+ *stats = vport->offset_stats;
stats->rx_errors += vport->err_stats.rx_errors
+ vport->err_stats.rx_frame_err
for_each_possible_cpu(i) {
const struct vport_percpu_stats *percpu_stats;
+ struct vport_percpu_stats local_stats;
+ unsigned seqcount;
percpu_stats = per_cpu_ptr(vport->percpu_stats, i);
- stats->rx_bytes += percpu_stats->rx_bytes;
- stats->rx_packets += percpu_stats->rx_packets;
- stats->tx_bytes += percpu_stats->tx_bytes;
- stats->tx_packets += percpu_stats->tx_packets;
+
+ do {
+ seqcount = read_seqcount_begin(&percpu_stats->seqlock);
+ local_stats = *percpu_stats;
+ } while (read_seqcount_retry(&percpu_stats->seqlock, seqcount));
+
+ stats->rx_bytes += local_stats.rx_bytes;
+ stats->rx_packets += local_stats.rx_packets;
+ stats->tx_bytes += local_stats.tx_bytes;
+ stats->tx_packets += local_stats.tx_packets;
}
err = 0;
struct vport_percpu_stats *stats;
local_bh_disable();
-
stats = per_cpu_ptr(vport->percpu_stats, smp_processor_id());
+
+ write_seqcount_begin(&stats->seqlock);
stats->rx_packets++;
stats->rx_bytes += skb->len;
+ write_seqcount_end(&stats->seqlock);
local_bh_enable();
}
+ if (!(vport->ops->flags & VPORT_F_FLOW))
+ OVS_CB(skb)->flow = NULL;
+
if (!(vport->ops->flags & VPORT_F_TUN_ID))
OVS_CB(skb)->tun_id = 0;
*/
int vport_send(struct vport *vport, struct sk_buff *skb)
{
- int *loop_count;
int mtu;
int sent;
- loop_count = &get_cpu_var(vport_loop_counter).count[!!in_interrupt()];
- (*loop_count)++;
-
- if (unlikely(*loop_count > VPORT_MAX_LOOPS)) {
- if (net_ratelimit())
- printk(KERN_WARNING "%s: dropping packet that has looped more than %d times\n",
- dp_name(vport_get_dp_port(vport)->dp), VPORT_MAX_LOOPS);
- goto error;
- }
-
mtu = vport_get_mtu(vport);
if (unlikely(packet_length(skb) > mtu && !skb_is_gso(skb))) {
if (net_ratelimit())
- printk(KERN_WARNING "%s: dropped over-mtu packet: %d > %d\n",
- dp_name(vport_get_dp_port(vport)->dp), packet_length(skb), mtu);
+ pr_warn("%s: dropped over-mtu packet: %d > %d\n",
+ dp_name(vport_get_dp_port(vport)->dp),
+ packet_length(skb), mtu);
goto error;
}
struct vport_percpu_stats *stats;
local_bh_disable();
-
stats = per_cpu_ptr(vport->percpu_stats, smp_processor_id());
+
+ write_seqcount_begin(&stats->seqlock);
stats->tx_packets++;
stats->tx_bytes += sent;
+ write_seqcount_end(&stats->seqlock);
local_bh_enable();
}
- goto out;
+ return sent;
error:
- sent = 0;
kfree_skb(skb);
vport_record_error(vport, VPORT_E_TX_DROPPED);
-out:
- (*loop_count)--;
- put_cpu_var(vport_loop_counter);
-
- return sent;
+ return 0;
}
/**