Signed-off-by: Daniele Di Proietto <diproiet...@vmware.com>
---
lib/dpif-netdev.c | 243 +++++++++++++++++++++++++++++++++++++++---------------
1 file changed, 175 insertions(+), 68 deletions(-)
diff --git a/lib/dpif-netdev.c b/lib/dpif-netdev.c
index 8c5893d..5d1cc43 100644
--- a/lib/dpif-netdev.c
+++ b/lib/dpif-netdev.c
@@ -185,6 +185,7 @@ static bool dpcls_lookup(const struct dpcls *cls,
*
* dp_netdev_mutex (global)
* port_mutex
+ * non_pmd_mutex
*/
struct dp_netdev {
const struct dpif_class *const class;
@@ -380,6 +381,13 @@ struct rxq_poll {
struct ovs_list node;
};
+/* Contained by struct dp_netdev_pmd_thread's 'port_cache' or 'tx_ports'. */
+struct tx_port {
+ odp_port_t port_no;
+ struct netdev *netdev;
+ struct hmap_node node;
+};
+
/* PMD: Poll modes drivers. PMD accesses devices via polling to eliminate
* the performance overhead of interrupt processing. Therefore netdev can
* not implement rx-wait for these devices. dpif-netdev needs to poll
@@ -436,10 +444,18 @@ struct dp_netdev_pmd_thread {
atomic_int tx_qid; /* Queue id used by this pmd thread to
* send packets on all netdevs */
- struct ovs_mutex poll_mutex; /* Mutex for poll_list. */
+ struct ovs_mutex port_mutex; /* Mutex for 'poll_list' and 'tx_ports'. */
/* List of rx queues to poll. */
struct ovs_list poll_list OVS_GUARDED;
- int poll_cnt; /* Number of elemints in poll_list. */
+ /* Number of elements in 'poll_list' */
+ int poll_cnt;
+ /* Map of 'tx_port's used for transmission. Written by the main thread,
+ * read by the pmd thread. */
+ struct hmap tx_ports OVS_GUARDED;
+
+ /* Map of 'tx_port' used in the fast path. This is a thread-local copy
+ * 'tx_ports'. */
+ struct hmap port_cache;
/* Only a pmd thread can write on its own 'cycles' and 'stats'.
* The main thread keeps 'stats_zero' and 'cycles_zero' as base
@@ -495,7 +511,7 @@ dp_netdev_pmd_get_next(struct dp_netdev *dp, struct
cmap_position *pos);
static void dp_netdev_destroy_all_pmds(struct dp_netdev *dp);
static void dp_netdev_del_pmds_on_numa(struct dp_netdev *dp, int numa_id);
static void dp_netdev_set_pmds_on_numa(struct dp_netdev *dp, int numa_id);
-static void dp_netdev_pmd_clear_poll_list(struct dp_netdev_pmd_thread *pmd);
+static void dp_netdev_pmd_clear_ports(struct dp_netdev_pmd_thread *pmd);
static void dp_netdev_del_port_from_all_pmds(struct dp_netdev *dp,
struct dp_netdev_port *port);
static void
@@ -509,6 +525,8 @@ static void dp_netdev_reset_pmd_threads(struct dp_netdev
*dp);
static bool dp_netdev_pmd_try_ref(struct dp_netdev_pmd_thread *pmd);
static void dp_netdev_pmd_unref(struct dp_netdev_pmd_thread *pmd);
static void dp_netdev_pmd_flow_flush(struct dp_netdev_pmd_thread *pmd);
+static void pmd_load_cached_ports(struct dp_netdev_pmd_thread *pmd)
+ OVS_REQUIRES(pmd->port_mutex);
static inline bool emc_entry_alive(struct emc_entry *ce);
static void emc_clear_entry(struct emc_entry *ce);
@@ -691,7 +709,7 @@ pmd_info_show_rxq(struct ds *reply, struct
dp_netdev_pmd_thread *pmd)
ds_put_format(reply, "pmd thread numa_id %d core_id %u:\n",
pmd->numa_id, pmd->core_id);
- ovs_mutex_lock(&pmd->poll_mutex);
+ ovs_mutex_lock(&pmd->port_mutex);
LIST_FOR_EACH (poll, node, &pmd->poll_list) {
const char *name = netdev_get_name(poll->port->netdev);
@@ -705,7 +723,7 @@ pmd_info_show_rxq(struct ds *reply, struct
dp_netdev_pmd_thread *pmd)
ds_put_format(reply, " %d", netdev_rxq_get_queue_id(poll->rx));
prev_name = name;
}
- ovs_mutex_unlock(&pmd->poll_mutex);
+ ovs_mutex_unlock(&pmd->port_mutex);
ds_put_cstr(reply, "\n");
}
}
@@ -1078,6 +1096,11 @@ dp_netdev_reload_pmd__(struct dp_netdev_pmd_thread *pmd)
int old_seq;
if (pmd->core_id == NON_PMD_CORE_ID) {
+ ovs_mutex_lock(&pmd->dp->non_pmd_mutex);
+ ovs_mutex_lock(&pmd->port_mutex);
+ pmd_load_cached_ports(pmd);
+ ovs_mutex_unlock(&pmd->port_mutex);
+ ovs_mutex_unlock(&pmd->dp->non_pmd_mutex);
return;
}
@@ -1200,9 +1223,7 @@ do_add_port(struct dp_netdev *dp, const char *devname,
const char *type,
cmap_insert(&dp->ports, &port->node, hash_port_no(port_no));
- if (netdev_is_pmd(port->netdev)) {
- dp_netdev_add_port_to_pmds(dp, port);
- }
+ dp_netdev_add_port_to_pmds(dp, port);
seq_change(dp->port_seq);
return 0;
@@ -1371,6 +1392,9 @@ do_del_port(struct dp_netdev *dp, struct dp_netdev_port
*port)
{
cmap_remove(&dp->ports, &port->node, hash_odp_port(port->port_no));
seq_change(dp->port_seq);
+
+ dp_netdev_del_port_from_all_pmds(dp, port);
+
if (netdev_is_pmd(port->netdev)) {
int numa_id = netdev_get_numa_id(port->netdev);
@@ -1380,8 +1404,6 @@ do_del_port(struct dp_netdev *dp, struct dp_netdev_port
*port)
* for that numa. Else, deletes the queues from polling lists. */
if (!has_pmd_port_for_numa(dp, numa_id)) {
dp_netdev_del_pmds_on_numa(dp, numa_id);
- } else {
- dp_netdev_del_port_from_all_pmds(dp, port);
}
}
@@ -2378,7 +2400,6 @@ dpif_netdev_execute(struct dpif *dpif, struct
dpif_execute *execute)
* the 'non_pmd_mutex'. */
if (pmd->core_id == NON_PMD_CORE_ID) {
ovs_mutex_lock(&dp->non_pmd_mutex);
- ovs_mutex_lock(&dp->port_mutex);
}
pp = execute->packet;
@@ -2386,7 +2407,6 @@ dpif_netdev_execute(struct dpif *dpif, struct
dpif_execute *execute)
execute->actions_len);
if (pmd->core_id == NON_PMD_CORE_ID) {
dp_netdev_pmd_unref(pmd);
- ovs_mutex_unlock(&dp->port_mutex);
ovs_mutex_unlock(&dp->non_pmd_mutex);
}
@@ -2650,21 +2670,53 @@ dpif_netdev_wait(struct dpif *dpif)
seq_wait(tnl_conf_seq, dp->last_tnl_conf_seq);
}
+static void
+pmd_free_cached_ports(struct dp_netdev_pmd_thread *pmd)
+{
+ struct tx_port *tx_port_cached;
+
+ HMAP_FOR_EACH_POP (tx_port_cached, node, &pmd->port_cache) {
+ free(tx_port_cached);
+ }
+}
+
+/* Copies ports from 'pmd->tx_ports' (shared with the main thread) to
+ * 'pmd->port_cache' (thread local) */
+static void
+pmd_load_cached_ports(struct dp_netdev_pmd_thread *pmd)
+ OVS_REQUIRES(pmd->port_mutex)
+{
+ struct tx_port *tx_port, *tx_port_cached;
+
+ pmd_free_cached_ports(pmd);
+ hmap_shrink(&pmd->port_cache);
+
+ HMAP_FOR_EACH (tx_port, node, &pmd->tx_ports) {
+ tx_port_cached = xmemdup(tx_port, sizeof *tx_port_cached);
+ hmap_insert(&pmd->port_cache, &tx_port_cached->node,
+ hash_port_no(tx_port_cached->port_no));
+ }
+}
+
static int
-pmd_load_queues(struct dp_netdev_pmd_thread *pmd, struct rxq_poll **ppoll_list)
+pmd_load_queues_and_ports(struct dp_netdev_pmd_thread *pmd,
+ struct rxq_poll **ppoll_list)
{
struct rxq_poll *poll_list = *ppoll_list;
struct rxq_poll *poll;
int i;
- ovs_mutex_lock(&pmd->poll_mutex);
+ ovs_mutex_lock(&pmd->port_mutex);
poll_list = xrealloc(poll_list, pmd->poll_cnt * sizeof *poll_list);
i = 0;
LIST_FOR_EACH (poll, node, &pmd->poll_list) {
poll_list[i++] = *poll;
}
- ovs_mutex_unlock(&pmd->poll_mutex);
+
+ pmd_load_cached_ports(pmd);
+
+ ovs_mutex_unlock(&pmd->port_mutex);
*ppoll_list = poll_list;
return i;
@@ -2686,7 +2738,7 @@ pmd_thread_main(void *f_)
/* Stores the pmd thread's 'pmd' to 'per_pmd_key'. */
ovsthread_setspecific(pmd->dp->per_pmd_key, pmd);
pmd_thread_setaffinity_cpu(pmd->core_id);
- poll_cnt = pmd_load_queues(pmd, &poll_list);
+ poll_cnt = pmd_load_queues_and_ports(pmd, &poll_list);
reload:
emc_cache_init(&pmd->flow_cache);
@@ -2719,7 +2771,7 @@ reload:
}
}
- poll_cnt = pmd_load_queues(pmd, &poll_list);
+ poll_cnt = pmd_load_queues_and_ports(pmd, &poll_list);
/* Signal here to make sure the pmd finishes
* reloading the updated configuration. */
dp_netdev_pmd_reload_done(pmd);
@@ -2731,6 +2783,7 @@ reload:
}
free(poll_list);
+ pmd_free_cached_ports(pmd);
return NULL;
}
@@ -2857,10 +2910,12 @@ dp_netdev_configure_pmd(struct dp_netdev_pmd_thread
*pmd, struct dp_netdev *dp,
xpthread_cond_init(&pmd->cond, NULL);
ovs_mutex_init(&pmd->cond_mutex);
ovs_mutex_init(&pmd->flow_mutex);
- ovs_mutex_init(&pmd->poll_mutex);
+ ovs_mutex_init(&pmd->port_mutex);
dpcls_init(&pmd->cls);
cmap_init(&pmd->flow_table);
ovs_list_init(&pmd->poll_list);
+ hmap_init(&pmd->tx_ports);
+ hmap_init(&pmd->port_cache);
/* init the 'flow_cache' since there is no
* actual thread created for NON_PMD_CORE_ID. */
if (core_id == NON_PMD_CORE_ID) {
@@ -2875,12 +2930,14 @@ dp_netdev_destroy_pmd(struct dp_netdev_pmd_thread *pmd)
{
dp_netdev_pmd_flow_flush(pmd);
dpcls_destroy(&pmd->cls);
+ hmap_destroy(&pmd->port_cache);
+ hmap_destroy(&pmd->tx_ports);
cmap_destroy(&pmd->flow_table);
ovs_mutex_destroy(&pmd->flow_mutex);
latch_destroy(&pmd->exit_latch);
xpthread_cond_destroy(&pmd->cond);
ovs_mutex_destroy(&pmd->cond_mutex);
- ovs_mutex_destroy(&pmd->poll_mutex);
+ ovs_mutex_destroy(&pmd->port_mutex);
free(pmd);
}
@@ -2889,10 +2946,11 @@ dp_netdev_destroy_pmd(struct dp_netdev_pmd_thread *pmd)
static void
dp_netdev_del_pmd(struct dp_netdev *dp, struct dp_netdev_pmd_thread *pmd)
{
- /* Uninit the 'flow_cache' since there is
- * no actual thread uninit it for NON_PMD_CORE_ID. */
+ /* NON_PMD_CORE_ID doesn't have a thread, so we don't have to synchronize,
+ * but extra cleanup is necessary */
if (pmd->core_id == NON_PMD_CORE_ID) {
emc_cache_uninit(&pmd->flow_cache);
+ pmd_free_cached_ports(pmd);
} else {
latch_set(&pmd->exit_latch);
dp_netdev_reload_pmd__(pmd);
@@ -2900,8 +2958,7 @@ dp_netdev_del_pmd(struct dp_netdev *dp, struct
dp_netdev_pmd_thread *pmd)
xpthread_join(pmd->thread, NULL);
}
- /* Unref all ports and free poll_list. */
- dp_netdev_pmd_clear_poll_list(pmd);
+ dp_netdev_pmd_clear_ports(pmd);
/* Purges the 'pmd''s flows after stopping the thread, but before
* destroying the flows, so that the flow stats can be collected. */
@@ -2984,30 +3041,51 @@ dp_netdev_del_pmds_on_numa(struct dp_netdev *dp, int
numa_id)
free(free_idx);
}
-/* Deletes all rx queues from pmd->poll_list. */
+/* Deletes all rx queues from pmd->poll_list and all the ports from
+ * pmd->tx_ports. */
static void
-dp_netdev_pmd_clear_poll_list(struct dp_netdev_pmd_thread *pmd)
+dp_netdev_pmd_clear_ports(struct dp_netdev_pmd_thread *pmd)
{
struct rxq_poll *poll;
+ struct tx_port *port;
- ovs_mutex_lock(&pmd->poll_mutex);
+ ovs_mutex_lock(&pmd->port_mutex);
LIST_FOR_EACH_POP (poll, node, &pmd->poll_list) {
free(poll);
}
pmd->poll_cnt = 0;
- ovs_mutex_unlock(&pmd->poll_mutex);
+ HMAP_FOR_EACH_POP (port, node, &pmd->tx_ports) {
+ free(port);
+ }
+ ovs_mutex_unlock(&pmd->port_mutex);
}
-/* Deletes all rx queues of 'port' from poll_list of pmd thread. Returns true
- * if 'port' was found in 'pmd' (therefore a restart is required). */
+static struct tx_port *
+tx_port_lookup(const struct hmap *hmap, odp_port_t port_no)
+{
+ struct tx_port *tx;
+
+ HMAP_FOR_EACH_IN_BUCKET (tx, node, hash_port_no(port_no), hmap) {
+ if (tx->port_no == port_no) {
+ return tx;
+ }
+ }
+
+ return NULL;
+}
+
+/* Deletes all rx queues of 'port' from 'poll_list', and the 'port' from
+ * 'tx_ports' of 'pmd' thread. Returns true if 'port' was found in 'pmd'
+ * (therefore a restart is required). */
static bool
dp_netdev_del_port_from_pmd__(struct dp_netdev_port *port,
struct dp_netdev_pmd_thread *pmd)
{
struct rxq_poll *poll, *next;
+ struct tx_port *tx;
bool found = false;
- ovs_mutex_lock(&pmd->poll_mutex);
+ ovs_mutex_lock(&pmd->port_mutex);
LIST_FOR_EACH_SAFE (poll, next, node, &pmd->poll_list) {
if (poll->port == port) {
found = true;
@@ -3016,36 +3094,41 @@ dp_netdev_del_port_from_pmd__(struct dp_netdev_port
*port,
free(poll);
}
}
- ovs_mutex_unlock(&pmd->poll_mutex);
+
+ tx = tx_port_lookup(&pmd->tx_ports, port->port_no);
+ if (tx) {
+ hmap_remove(&pmd->tx_ports, &tx->node);
+ free(tx);
+ found = true;
+ }
+ ovs_mutex_unlock(&pmd->port_mutex);
return found;
}
-/* Deletes all rx queues of 'port' from all pmd threads. The pmd threads that
- * need to be restarted are inserted in 'to_reload'. */
+/* Deletes 'port' from the 'poll_list' and from the 'tx_ports' of all the pmd
+ * threads. The pmd threads that need to be restarted are inserted in
+ * 'to_reload'. */
static void
dp_netdev_del_port_from_all_pmds__(struct dp_netdev *dp,
struct dp_netdev_port *port,
struct hmapx *to_reload)
{
- int numa_id = netdev_get_numa_id(port->netdev);
struct dp_netdev_pmd_thread *pmd;
CMAP_FOR_EACH (pmd, node, &dp->poll_threads) {
- if (pmd->numa_id == numa_id) {
- bool found;
+ bool found;
- found = dp_netdev_del_port_from_pmd__(port, pmd);
+ found = dp_netdev_del_port_from_pmd__(port, pmd);
- if (found) {
- hmapx_add(to_reload, pmd);
- }
- }
+ if (found) {
+ hmapx_add(to_reload, pmd);
+ }
}
}
-/* Deletes all rx queues of 'port' from all pmd threads of dp and
- * reloads them if needed. */
+/* Deletes 'port' from the 'poll_list' and from the 'tx_ports' of all the pmd
+ * threads. Reloads the threads if needed. */
static void
dp_netdev_del_port_from_all_pmds(struct dp_netdev *dp,
struct dp_netdev_port *port)
@@ -3089,7 +3172,7 @@ dp_netdev_less_loaded_pmd_on_numa(struct dp_netdev *dp,
int numa_id)
static void
dp_netdev_add_rxq_to_pmd(struct dp_netdev_pmd_thread *pmd,
struct dp_netdev_port *port, struct netdev_rxq *rx)
- OVS_REQUIRES(pmd->poll_mutex)
+ OVS_REQUIRES(pmd->port_mutex)
{
struct rxq_poll *poll = xmalloc(sizeof *poll);
@@ -3100,8 +3183,9 @@ dp_netdev_add_rxq_to_pmd(struct dp_netdev_pmd_thread *pmd,
pmd->poll_cnt++;
}
-/* Distributes all rx queues of 'port' between all PMD threads in 'dp'. The
- * pmd threads that need to be restarted are inserted in 'to_reload'. */
+/* Distributes all rx queues of 'port' between all PMD threads in 'dp' and
+ * inserts 'port' in the PMD threads 'tx_ports'. The pmd threads that need to
+ * be restarted are inserted in 'to_reload'. */
static void
dp_netdev_add_port_to_pmds__(struct dp_netdev *dp, struct dp_netdev_port *port,
struct hmapx *to_reload)
@@ -3110,27 +3194,41 @@ dp_netdev_add_port_to_pmds__(struct dp_netdev *dp,
struct dp_netdev_port *port,
struct dp_netdev_pmd_thread *pmd;
int i;
- /* Cannot create pmd threads for invalid numa node. */
- ovs_assert(ovs_numa_numa_id_is_valid(numa_id));
- dp_netdev_set_pmds_on_numa(dp, numa_id);
+ if (netdev_is_pmd(port->netdev)) {
+ /* Cannot create pmd threads for invalid numa node. */
+ ovs_assert(ovs_numa_numa_id_is_valid(numa_id));
+ dp_netdev_set_pmds_on_numa(dp, numa_id);
- for (i = 0; i < port->n_rxq; i++) {
- pmd = dp_netdev_less_loaded_pmd_on_numa(dp, numa_id);
- if (!pmd) {
- VLOG_WARN("There's no pmd thread on numa node %d", numa_id);
- break;
+ for (i = 0; i < port->n_rxq; i++) {
+ pmd = dp_netdev_less_loaded_pmd_on_numa(dp, numa_id);
+ if (!pmd) {
+ VLOG_WARN("There's no pmd thread on numa node %d", numa_id);
+ break;
+ }
+
+ ovs_mutex_lock(&pmd->port_mutex);
+ dp_netdev_add_rxq_to_pmd(pmd, port, port->rxq[i]);
+ ovs_mutex_unlock(&pmd->port_mutex);
+
+ hmapx_add(to_reload, pmd);
}
+ }
+
+ CMAP_FOR_EACH (pmd, node, &dp->poll_threads) {
+ struct tx_port *tx = xzalloc(sizeof *tx);
- ovs_mutex_lock(&pmd->poll_mutex);
- dp_netdev_add_rxq_to_pmd(pmd, port, port->rxq[i]);
- ovs_mutex_unlock(&pmd->poll_mutex);
+ tx->netdev = port->netdev;
+ tx->port_no = port->port_no;
+ ovs_mutex_lock(&pmd->port_mutex);
+ hmap_insert(&pmd->tx_ports, &tx->node, hash_port_no(tx->port_no));
+ ovs_mutex_unlock(&pmd->port_mutex);
hmapx_add(to_reload, pmd);
}
}
-/* Distributes all rx queues of 'port' between all PMD threads in 'dp' and
- * reloads them, if needed. */
+/* Distributes all rx queues of 'port' between all PMD threads in 'dp', inserts
+ * 'port' in the PMD threads 'tx_ports' and reloads them, if needed. */
static void
dp_netdev_add_port_to_pmds(struct dp_netdev *dp, struct dp_netdev_port *port)
{
@@ -3704,6 +3802,13 @@ dpif_netdev_register_upcall_cb(struct dpif *dpif,
upcall_callback *cb,
dp->upcall_cb = cb;
}
+static struct tx_port *
+pmd_tx_port_cache_lookup(const struct dp_netdev_pmd_thread *pmd,
+ odp_port_t port_no)
+{
+ return tx_port_lookup(&pmd->port_cache, port_no);
+}
+
static void
dp_netdev_drop_packets(struct dp_packet **packets, int cnt, bool may_steal)
{
@@ -3717,16 +3822,16 @@ dp_netdev_drop_packets(struct dp_packet **packets, int
cnt, bool may_steal)
}
static int
-push_tnl_action(const struct dp_netdev *dp,
- const struct nlattr *attr,
- struct dp_packet **packets, int cnt)
+push_tnl_action(const struct dp_netdev_pmd_thread *pmd,
+ const struct nlattr *attr,
+ struct dp_packet **packets, int cnt)
{
- struct dp_netdev_port *tun_port;
+ struct tx_port *tun_port;
const struct ovs_action_push_tnl *data;
data = nl_attr_get(attr);
- tun_port = dp_netdev_lookup_port(dp, u32_to_odp(data->tnl_port));
+ tun_port = pmd_tx_port_cache_lookup(pmd, u32_to_odp(data->tnl_port));
if (!tun_port) {
return -EINVAL;
}
@@ -3756,12 +3861,12 @@ dp_execute_cb(void *aux_, struct dp_packet **packets,
int cnt,
struct dp_netdev_pmd_thread *pmd = aux->pmd;
struct dp_netdev *dp = pmd->dp;
int type = nl_attr_type(a);
- struct dp_netdev_port *p;
+ struct tx_port *p;
int i;
switch ((enum ovs_action_attr)type) {
case OVS_ACTION_ATTR_OUTPUT:
- p = dp_netdev_lookup_port(dp, u32_to_odp(nl_attr_get_u32(a)));
+ p = pmd_tx_port_cache_lookup(pmd, u32_to_odp(nl_attr_get_u32(a)));
if (OVS_LIKELY(p)) {
int tx_qid;
@@ -3782,7 +3887,7 @@ dp_execute_cb(void *aux_, struct dp_packet **packets, int
cnt,
packets = tnl_pkt;
}
- err = push_tnl_action(dp, a, packets, cnt);
+ err = push_tnl_action(pmd, a, packets, cnt);
if (!err) {
(*depth)++;
dp_netdev_recirculate(pmd, packets, cnt);
@@ -3798,7 +3903,7 @@ dp_execute_cb(void *aux_, struct dp_packet **packets, int
cnt,
if (*depth < MAX_RECIRC_DEPTH) {
odp_port_t portno = u32_to_odp(nl_attr_get_u32(a));
- p = dp_netdev_lookup_port(dp, portno);
+ p = pmd_tx_port_cache_lookup(pmd, portno);
if (p) {
struct dp_packet *tnl_pkt[NETDEV_MAX_BURST];
int err;
@@ -4001,12 +4106,14 @@ dpif_dummy_change_port_number(struct unixctl_conn
*conn, int argc OVS_UNUSED,
/* Remove old port. */
cmap_remove(&dp->ports, &old_port->node, hash_port_no(old_port->port_no));
+ dp_netdev_del_port_from_all_pmds(dp, old_port);
ovsrcu_postpone(free, old_port);
/* Insert new port (cmap semantics mean we cannot re-insert 'old_port'). */
new_port = xmemdup(old_port, sizeof *old_port);
new_port->port_no = port_no;
cmap_insert(&dp->ports, &new_port->node, hash_port_no(port_no));
+ dp_netdev_add_port_to_pmds(dp, new_port);
seq_change(dp->port_seq);
unixctl_command_reply(conn, NULL);
--
2.1.4
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