Signed-off-by: Alex Wang <[email protected]>
---
lib/dpif-netdev.c | 190 ++++++++++++++++++++++++++++++++++-------------------
lib/flow.c | 18 +++++
lib/flow.h | 1 +
3 files changed, 143 insertions(+), 66 deletions(-)
diff --git a/lib/dpif-netdev.c b/lib/dpif-netdev.c
index ee8be43..62a775f 100644
--- a/lib/dpif-netdev.c
+++ b/lib/dpif-netdev.c
@@ -73,7 +73,6 @@ enum { MAX_FLOWS = 65536 }; /* Maximum number of flows in
flow table. */
enum { DP_NETDEV_HEADROOM = 2 + VLAN_HEADER_LEN };
/* Queues. */
-enum { N_QUEUES = 2 }; /* Number of queues for dpif_recv(). */
enum { MAX_QUEUE_LEN = 128 }; /* Maximum number of packets per queue. */
enum { QUEUE_MASK = MAX_QUEUE_LEN - 1 };
BUILD_ASSERT_DECL(IS_POW2(MAX_QUEUE_LEN));
@@ -90,14 +89,17 @@ struct dp_netdev_upcall {
struct ofpbuf buf; /* ofpbuf instance for upcall.packet. */
};
-/* A queue passing packets from a struct dp_netdev to its clients.
+/* A queue passing packets from a struct dp_netdev to its clients (handlers).
*
*
* Thread-safety
* =============
*
- * Any access at all requires the owning 'dp_netdev''s queue_mutex. */
+ * Any access at all requires the owning 'dp_netdev''s queue_rwlock and
+ * its own mutex. */
struct dp_netdev_queue {
+ struct ovs_mutex mutex;
+ struct seq *seq; /* Incremented whenever a packet is queued. */
struct dp_netdev_upcall upcalls[MAX_QUEUE_LEN] OVS_GUARDED;
unsigned int head OVS_GUARDED;
unsigned int tail OVS_GUARDED;
@@ -118,7 +120,7 @@ struct dp_netdev_queue {
* port_rwlock
* flow_mutex
* cls.rwlock
- * queue_mutex
+ * queue_rwlock
*/
struct dp_netdev {
const struct dpif_class *const class;
@@ -140,10 +142,12 @@ struct dp_netdev {
/* Queues.
*
- * Everything in 'queues' is protected by 'queue_mutex'. */
- struct ovs_mutex queue_mutex;
- struct dp_netdev_queue queues[N_QUEUES];
- struct seq *queue_seq; /* Incremented whenever a packet is queued. */
+ * 'queue_rwlock' protects the modification of 'handler_queues' and
+ * 'n_handlers'. The queue elements are protected by its
+ * 'handler_queues''s mutex. */
+ struct fat_rwlock queue_rwlock;
+ struct dp_netdev_queue *handler_queues;
+ uint32_t n_handlers;
/* Statistics.
*
@@ -317,12 +321,15 @@ static int do_add_port(struct dp_netdev *dp, const char
*devname,
OVS_REQ_WRLOCK(dp->port_rwlock);
static int do_del_port(struct dp_netdev *dp, odp_port_t port_no)
OVS_REQ_WRLOCK(dp->port_rwlock);
+static void dp_netdev_destroy_all_queues(struct dp_netdev *dp)
+ OVS_EXCLUDED(dp->queue_rwlock);
static int dpif_netdev_open(const struct dpif_class *, const char *name,
bool create, struct dpif **);
static int dp_netdev_output_userspace(struct dp_netdev *dp, struct ofpbuf *,
- int queue_no, const struct flow *,
- const struct nlattr *userdata)
- OVS_EXCLUDED(dp->queue_mutex);
+ int queue_no, int type,
+ const struct flow *,
+ const struct nlattr *userdata)
+ OVS_EXCLUDED(dp->queue_rwlock);
static void dp_netdev_execute_actions(struct dp_netdev *dp,
const struct flow *, struct ofpbuf *,
struct pkt_metadata *,
@@ -440,7 +447,6 @@ create_dp_netdev(const char *name, const struct dpif_class
*class,
{
struct dp_netdev *dp;
int error;
- int i;
dp = xzalloc(sizeof *dp);
shash_add(&dp_netdevs, name, dp);
@@ -454,13 +460,7 @@ create_dp_netdev(const char *name, const struct dpif_class
*class,
classifier_init(&dp->cls, NULL);
hmap_init(&dp->flow_table);
- ovs_mutex_init(&dp->queue_mutex);
- ovs_mutex_lock(&dp->queue_mutex);
- for (i = 0; i < N_QUEUES; i++) {
- dp->queues[i].head = dp->queues[i].tail = 0;
- }
- ovs_mutex_unlock(&dp->queue_mutex);
- dp->queue_seq = seq_create();
+ fat_rwlock_init(&dp->queue_rwlock);
dp->n_hit = ovsthread_counter_create();
dp->n_missed = ovsthread_counter_create();
@@ -510,20 +510,21 @@ dpif_netdev_open(const struct dpif_class *class, const
char *name,
static void
dp_netdev_purge_queues(struct dp_netdev *dp)
+ OVS_REQ_WRLOCK(dp->queue_rwlock)
{
int i;
- ovs_mutex_lock(&dp->queue_mutex);
- for (i = 0; i < N_QUEUES; i++) {
- struct dp_netdev_queue *q = &dp->queues[i];
+ for (i = 0; i < dp->n_handlers; i++) {
+ struct dp_netdev_queue *q = &dp->handler_queues[i];
+ ovs_mutex_lock(&q->mutex);
while (q->tail != q->head) {
struct dp_netdev_upcall *u = &q->upcalls[q->tail++ & QUEUE_MASK];
ofpbuf_uninit(&u->upcall.packet);
ofpbuf_uninit(&u->buf);
}
+ ovs_mutex_unlock(&q->mutex);
}
- ovs_mutex_unlock(&dp->queue_mutex);
}
/* Requires dp_netdev_mutex so that we can't get a new reference to 'dp'
@@ -549,9 +550,8 @@ dp_netdev_free(struct dp_netdev *dp)
ovsthread_counter_destroy(dp->n_missed);
ovsthread_counter_destroy(dp->n_lost);
- dp_netdev_purge_queues(dp);
- seq_destroy(dp->queue_seq);
- ovs_mutex_destroy(&dp->queue_mutex);
+ dp_netdev_destroy_all_queues(dp);
+ fat_rwlock_destroy(&dp->queue_rwlock);
classifier_destroy(&dp->cls);
hmap_destroy(&dp->flow_table);
@@ -1430,18 +1430,73 @@ dpif_netdev_execute(struct dpif *dpif, struct
dpif_execute *execute)
return 0;
}
+static void
+dp_netdev_init_queue(struct dp_netdev_queue *q)
+{
+ ovs_mutex_init(&q->mutex);
+ q->seq = seq_create();
+}
+
+static void
+dp_netdev_uninit_queue(struct dp_netdev_queue *q)
+{
+ ovs_mutex_destroy(&q->mutex);
+ seq_destroy(q->seq);
+}
+
+static void
+dp_netdev_destroy_all_queues(struct dp_netdev *dp)
+ OVS_EXCLUDED(dp->queue_rwlock)
+{
+ size_t i;
+
+ fat_rwlock_wrlock(&dp->queue_rwlock);
+ dp_netdev_purge_queues(dp);
+
+ for (i = 0; i < dp->n_handlers; i++) {
+ dp_netdev_uninit_queue(&dp->handler_queues[i]);
+ }
+ free(dp->handler_queues);
+ dp->handler_queues = NULL;
+ dp->n_handlers = 0;
+ fat_rwlock_unlock(&dp->queue_rwlock);
+}
+
+static void
+dp_netdev_refresh_queues(struct dp_netdev *dp, uint32_t n_handlers)
+ OVS_EXCLUDED(dp->queue_rwlock)
+{
+ if (dp->n_handlers != n_handlers) {
+ size_t i;
+
+ dp_netdev_destroy_all_queues(dp);
+
+ fat_rwlock_wrlock(&dp->queue_rwlock);
+ dp->n_handlers = n_handlers;
+ dp->handler_queues = xzalloc(n_handlers * sizeof *dp->handler_queues);
+
+ for (i = 0; i < n_handlers; i++) {
+ dp_netdev_init_queue(&dp->handler_queues[i]);
+ }
+ fat_rwlock_unlock(&dp->queue_rwlock);
+ }
+}
+
static int
-dpif_netdev_recv_set(struct dpif *dpif OVS_UNUSED, bool enable OVS_UNUSED,
- uint32_t n_handlers OVS_UNUSED)
+dpif_netdev_recv_set(struct dpif *dpif, bool enable OVS_UNUSED,
+ uint32_t n_handlers)
{
+ struct dp_netdev *dp = get_dp_netdev(dpif);
+
+ dp_netdev_refresh_queues(dp, n_handlers);
+
return 0;
}
static int
-dpif_netdev_handlers_set(struct dpif *dpif OVS_UNUSED,
- uint32_t n_handlers OVS_UNUSED)
+dpif_netdev_handlers_set(struct dpif *dpif, uint32_t n_handlers)
{
- return 0;
+ return dpif_netdev_recv_set(dpif, true, n_handlers);
}
static int
@@ -1452,32 +1507,18 @@ dpif_netdev_queue_to_priority(const struct dpif *dpif
OVS_UNUSED,
return 0;
}
-static struct dp_netdev_queue *
-find_nonempty_queue(struct dp_netdev *dp)
- OVS_REQUIRES(dp->queue_mutex)
-{
- int i;
-
- for (i = 0; i < N_QUEUES; i++) {
- struct dp_netdev_queue *q = &dp->queues[i];
- if (q->head != q->tail) {
- return q;
- }
- }
- return NULL;
-}
-
static int
-dpif_netdev_recv(struct dpif *dpif, uint32_t n_handlers OVS_UNUSED,
+dpif_netdev_recv(struct dpif *dpif, uint32_t handler_id,
struct dpif_upcall *upcall, struct ofpbuf *buf)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
struct dp_netdev_queue *q;
int error;
- ovs_mutex_lock(&dp->queue_mutex);
- q = find_nonempty_queue(dp);
- if (q) {
+ fat_rwlock_rdlock(&dp->queue_rwlock);
+ q = &dp->handler_queues[handler_id];
+ ovs_mutex_lock(&q->mutex);
+ if (q->head != q->tail) {
struct dp_netdev_upcall *u = &q->upcalls[q->tail++ & QUEUE_MASK];
*upcall = u->upcall;
@@ -1489,25 +1530,32 @@ dpif_netdev_recv(struct dpif *dpif, uint32_t n_handlers
OVS_UNUSED,
} else {
error = EAGAIN;
}
- ovs_mutex_unlock(&dp->queue_mutex);
+ ovs_mutex_unlock(&q->mutex);
+ fat_rwlock_unlock(&dp->queue_rwlock);
return error;
}
static void
-dpif_netdev_recv_wait(struct dpif *dpif, uint32_t handler_id OVS_UNUSED)
+dpif_netdev_recv_wait(struct dpif *dpif, uint32_t handler_id)
{
struct dp_netdev *dp = get_dp_netdev(dpif);
+ struct dp_netdev_queue *q;
uint64_t seq;
- ovs_mutex_lock(&dp->queue_mutex);
- seq = seq_read(dp->queue_seq);
- if (find_nonempty_queue(dp)) {
+ fat_rwlock_rdlock(&dp->queue_rwlock);
+
+ q = &dp->handler_queues[handler_id];
+ ovs_mutex_lock(&q->mutex);
+ seq = seq_read(q->seq);
+ if (q->head != q->tail) {
poll_immediate_wake();
} else {
- seq_wait(dp->queue_seq, seq);
+ seq_wait(q->seq, seq);
}
- ovs_mutex_unlock(&dp->queue_mutex);
+
+ ovs_mutex_unlock(&q->mutex);
+ fat_rwlock_unlock(&dp->queue_rwlock);
}
static void
@@ -1515,7 +1563,9 @@ dpif_netdev_recv_purge(struct dpif *dpif)
{
struct dpif_netdev *dpif_netdev = dpif_netdev_cast(dpif);
+ fat_rwlock_wrlock(&dpif_netdev->dp->queue_rwlock);
dp_netdev_purge_queues(dpif_netdev->dp);
+ fat_rwlock_unlock(&dpif_netdev->dp->queue_rwlock);
}
/* Creates and returns a new 'struct dp_netdev_actions', with a reference count
@@ -1719,27 +1769,31 @@ dp_netdev_port_input(struct dp_netdev *dp, struct
ofpbuf *packet,
ovsthread_counter_inc(dp->n_hit, 1);
} else {
ovsthread_counter_inc(dp->n_missed, 1);
- dp_netdev_output_userspace(dp, packet, DPIF_UC_MISS, &key, NULL);
+ dp_netdev_output_userspace(dp, packet,
+ flow_hash_5tuple(&key, 0) % dp->n_handlers,
+ DPIF_UC_MISS, &key, NULL);
}
}
static int
dp_netdev_output_userspace(struct dp_netdev *dp, struct ofpbuf *packet,
- int queue_no, const struct flow *flow,
+ int queue_no, int type, const struct flow *flow,
const struct nlattr *userdata)
- OVS_EXCLUDED(dp->queue_mutex)
+ OVS_EXCLUDED(dp->queue_rwlock)
{
- struct dp_netdev_queue *q = &dp->queues[queue_no];
+ struct dp_netdev_queue *q;
int error;
- ovs_mutex_lock(&dp->queue_mutex);
+ fat_rwlock_rdlock(&dp->queue_rwlock);
+ q = &dp->handler_queues[queue_no];
+ ovs_mutex_lock(&q->mutex);
if (q->head - q->tail < MAX_QUEUE_LEN) {
struct dp_netdev_upcall *u = &q->upcalls[q->head++ & QUEUE_MASK];
struct dpif_upcall *upcall = &u->upcall;
struct ofpbuf *buf = &u->buf;
size_t buf_size;
- upcall->type = queue_no;
+ upcall->type = type;
/* Allocate buffer big enough for everything. */
buf_size = ODPUTIL_FLOW_KEY_BYTES;
@@ -1764,14 +1818,15 @@ dp_netdev_output_userspace(struct dp_netdev *dp, struct
ofpbuf *packet,
upcall->packet = *packet;
ofpbuf_use(packet, NULL, 0);
- seq_change(dp->queue_seq);
+ seq_change(q->seq);
error = 0;
} else {
ovsthread_counter_inc(dp->n_lost, 1);
error = ENOBUFS;
}
- ovs_mutex_unlock(&dp->queue_mutex);
+ ovs_mutex_unlock(&q->mutex);
+ fat_rwlock_unlock(&dp->queue_rwlock);
return error;
}
@@ -1808,7 +1863,10 @@ dp_execute_cb(void *aux_, struct ofpbuf *packet,
if (!may_steal) {
packet = ofpbuf_clone_with_headroom(packet, DP_NETDEV_HEADROOM);
}
- dp_netdev_output_userspace(aux->dp, packet, DPIF_UC_ACTION, aux->key,
+ dp_netdev_output_userspace(aux->dp, packet,
+ flow_hash_5tuple(aux->key, 0)
+ % aux->dp->n_handlers,
+ DPIF_UC_ACTION, aux->key,
userdata);
if (!may_steal) {
ofpbuf_uninit(packet);
diff --git a/lib/flow.c b/lib/flow.c
index e7fe4d3..7a36940 100644
--- a/lib/flow.c
+++ b/lib/flow.c
@@ -822,6 +822,24 @@ flow_wildcards_set_reg_mask(struct flow_wildcards *wc, int
idx, uint32_t mask)
wc->masks.regs[idx] = mask;
}
+/* Calculates the 5-tuple hash from the given flow. */
+uint32_t
+flow_hash_5tuple(const struct flow *flow, uint32_t basis)
+{
+ uint32_t hash;
+
+ if (!flow) {
+ return 0;
+ }
+
+ hash = (OVS_FORCE int) flow->nw_src
+ ^ (OVS_FORCE int) flow->nw_dst
+ ^ flow->nw_proto ^ (OVS_FORCE int) flow->tp_src
+ ^ (OVS_FORCE int) flow->tp_dst;
+
+ return jhash_bytes((void *) &hash, sizeof hash, basis);
+}
+
/* Hashes 'flow' based on its L2 through L4 protocol information. */
uint32_t
flow_hash_symmetric_l4(const struct flow *flow, uint32_t basis)
diff --git a/lib/flow.h b/lib/flow.h
index 3109a84..46ab481 100644
--- a/lib/flow.h
+++ b/lib/flow.h
@@ -323,6 +323,7 @@ void flow_wildcards_fold_minimask_range(struct
flow_wildcards *,
uint32_t flow_wildcards_hash(const struct flow_wildcards *, uint32_t basis);
bool flow_wildcards_equal(const struct flow_wildcards *,
const struct flow_wildcards *);
+uint32_t flow_hash_5tuple(const struct flow *flow, uint32_t basis);
uint32_t flow_hash_symmetric_l4(const struct flow *flow, uint32_t basis);
/* Initialize a flow with random fields that matter for nx_hash_fields. */
--
1.7.9.5
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