[ovs-dev] [PATCH 3/3] dpif-netdev: Use cmap for ports.
Jarno Rajahalme
jrajahalme at nicira.com
Wed May 21 19:47:04 UTC 2014
Acked-by: Jarno Rajahalme <jrajahalme at nicira.com>
On May 20, 2014, at 5:11 PM, Ben Pfaff <blp at nicira.com> wrote:
> Signed-off-by: Ben Pfaff <blp at nicira.com>
> Acked-by: Jarno Rajahalme <jrajahalme at nicira.com>
> ---
> lib/dpif-netdev.c | 171 +++++++++++++++++++++++++++--------------------------
> 1 file changed, 87 insertions(+), 84 deletions(-)
>
> diff --git a/lib/dpif-netdev.c b/lib/dpif-netdev.c
> index a8e6a55..df62912 100644
> --- a/lib/dpif-netdev.c
> +++ b/lib/dpif-netdev.c
> @@ -32,6 +32,7 @@
> #include <unistd.h>
>
> #include "classifier.h"
> +#include "cmap.h"
> #include "csum.h"
> #include "dpif.h"
> #include "dpif-provider.h"
> @@ -120,7 +121,7 @@ struct dp_netdev_queue {
> * Acquisition order is, from outermost to innermost:
> *
> * dp_netdev_mutex (global)
> - * port_rwlock
> + * port_mutex
> * flow_mutex
> * cls.rwlock
> * queue_rwlock
> @@ -159,10 +160,9 @@ struct dp_netdev {
>
> /* Ports.
> *
> - * Any lookup into 'ports' or any access to the dp_netdev_ports found
> - * through 'ports' requires taking 'port_rwlock'. */
> - struct ovs_rwlock port_rwlock;
> - struct hmap ports OVS_GUARDED;
> + * Protected by RCU. Take the mutex to add or remove ports. */
> + struct ovs_mutex port_mutex;
> + struct cmap ports;
> struct seq *port_seq; /* Incremented whenever a port changes. */
>
> /* Forwarding threads. */
> @@ -173,8 +173,7 @@ struct dp_netdev {
> };
>
> static struct dp_netdev_port *dp_netdev_lookup_port(const struct dp_netdev *dp,
> - odp_port_t)
> - OVS_REQ_RDLOCK(dp->port_rwlock);
> + odp_port_t);
>
> enum dp_stat_type {
> DP_STAT_HIT, /* Packets that matched in the flow table. */
> @@ -194,7 +193,7 @@ struct dp_netdev_stats {
>
> /* A port in a netdev-based datapath. */
> struct dp_netdev_port {
> - struct hmap_node node; /* Node in dp_netdev's 'ports'. */
> + struct cmap_node node; /* Node in dp_netdev's 'ports'. */
> odp_port_t port_no;
> struct netdev *netdev;
> struct netdev_saved_flags *sf;
> @@ -317,19 +316,17 @@ struct dpif_netdev {
> };
>
> static int get_port_by_number(struct dp_netdev *dp, odp_port_t port_no,
> - struct dp_netdev_port **portp)
> - OVS_REQ_RDLOCK(dp->port_rwlock);
> + struct dp_netdev_port **portp);
> static int get_port_by_name(struct dp_netdev *dp, const char *devname,
> - struct dp_netdev_port **portp)
> - OVS_REQ_RDLOCK(dp->port_rwlock);
> + struct dp_netdev_port **portp);
> static void dp_netdev_free(struct dp_netdev *)
> OVS_REQUIRES(dp_netdev_mutex);
> static void dp_netdev_flow_flush(struct dp_netdev *);
> static int do_add_port(struct dp_netdev *dp, const char *devname,
> const char *type, odp_port_t port_no)
> - OVS_REQ_WRLOCK(dp->port_rwlock);
> + OVS_REQUIRES(dp->port_mutex);
> static int do_del_port(struct dp_netdev *dp, odp_port_t port_no)
> - OVS_REQ_WRLOCK(dp->port_rwlock);
> + OVS_REQUIRES(dp->port_mutex);
> static void dp_netdev_destroy_all_queues(struct dp_netdev *dp)
> OVS_REQ_WRLOCK(dp->queue_rwlock);
> static int dpif_netdev_open(const struct dpif_class *, const char *name,
> @@ -410,7 +407,7 @@ create_dpif_netdev(struct dp_netdev *dp)
> * Return ODPP_NONE on failure. */
> static odp_port_t
> choose_port(struct dp_netdev *dp, const char *name)
> - OVS_REQ_RDLOCK(dp->port_rwlock)
> + OVS_REQUIRES(dp->port_mutex)
> {
> uint32_t port_no;
>
> @@ -472,14 +469,14 @@ create_dp_netdev(const char *name, const struct dpif_class *class,
>
> ovsthread_stats_init(&dp->stats);
>
> - ovs_rwlock_init(&dp->port_rwlock);
> - hmap_init(&dp->ports);
> + ovs_mutex_init(&dp->port_mutex);
> + cmap_init(&dp->ports);
> dp->port_seq = seq_create();
> latch_init(&dp->exit_latch);
>
> - ovs_rwlock_wrlock(&dp->port_rwlock);
> + ovs_mutex_lock(&dp->port_mutex);
> error = do_add_port(dp, name, "internal", ODPP_LOCAL);
> - ovs_rwlock_unlock(&dp->port_rwlock);
> + ovs_mutex_unlock(&dp->port_mutex);
> if (error) {
> dp_netdev_free(dp);
> return error;
> @@ -538,8 +535,9 @@ static void
> dp_netdev_free(struct dp_netdev *dp)
> OVS_REQUIRES(dp_netdev_mutex)
> {
> - struct dp_netdev_port *port, *next;
> + struct dp_netdev_port *port;
> struct dp_netdev_stats *bucket;
> + struct cmap_cursor cursor;
> int i;
>
> shash_find_and_delete(&dp_netdevs, dp->name);
> @@ -548,11 +546,11 @@ dp_netdev_free(struct dp_netdev *dp)
> free(dp->pmd_threads);
>
> dp_netdev_flow_flush(dp);
> - ovs_rwlock_wrlock(&dp->port_rwlock);
> - HMAP_FOR_EACH_SAFE (port, next, node, &dp->ports) {
> + ovs_mutex_lock(&dp->port_mutex);
> + CMAP_FOR_EACH (port, node, &cursor, &dp->ports) {
> do_del_port(dp, port->port_no);
> }
> - ovs_rwlock_unlock(&dp->port_rwlock);
> + ovs_mutex_unlock(&dp->port_mutex);
>
> OVSTHREAD_STATS_FOR_EACH_BUCKET (bucket, i, &dp->stats) {
> ovs_mutex_destroy(&bucket->mutex);
> @@ -570,7 +568,7 @@ dp_netdev_free(struct dp_netdev *dp)
> hmap_destroy(&dp->flow_table);
> ovs_mutex_destroy(&dp->flow_mutex);
> seq_destroy(dp->port_seq);
> - hmap_destroy(&dp->ports);
> + cmap_destroy(&dp->ports);
> latch_destroy(&dp->exit_latch);
> free(CONST_CAST(char *, dp->name));
> free(dp);
> @@ -652,10 +650,16 @@ dp_netdev_reload_pmd_threads(struct dp_netdev *dp)
> }
> }
>
> +static uint32_t
> +hash_port_no(odp_port_t port_no)
> +{
> + return hash_int(odp_to_u32(port_no), 0);
> +}
> +
> static int
> do_add_port(struct dp_netdev *dp, const char *devname, const char *type,
> odp_port_t port_no)
> - OVS_REQ_WRLOCK(dp->port_rwlock)
> + OVS_REQUIRES(dp->port_mutex)
> {
> struct netdev_saved_flags *sf;
> struct dp_netdev_port *port;
> @@ -717,7 +721,7 @@ do_add_port(struct dp_netdev *dp, const char *devname, const char *type,
> }
> ovs_refcount_init(&port->ref_cnt);
>
> - hmap_insert(&dp->ports, &port->node, hash_int(odp_to_u32(port_no), 0));
> + cmap_insert(&dp->ports, &port->node, hash_port_no(port_no));
> seq_change(dp->port_seq);
>
> return 0;
> @@ -733,7 +737,7 @@ dpif_netdev_port_add(struct dpif *dpif, struct netdev *netdev,
> odp_port_t port_no;
> int error;
>
> - ovs_rwlock_wrlock(&dp->port_rwlock);
> + ovs_mutex_lock(&dp->port_mutex);
> dpif_port = netdev_vport_get_dpif_port(netdev, namebuf, sizeof namebuf);
> if (*port_nop != ODPP_NONE) {
> port_no = *port_nop;
> @@ -746,7 +750,7 @@ dpif_netdev_port_add(struct dpif *dpif, struct netdev *netdev,
> *port_nop = port_no;
> error = do_add_port(dp, dpif_port, netdev_get_type(netdev), port_no);
> }
> - ovs_rwlock_unlock(&dp->port_rwlock);
> + ovs_mutex_unlock(&dp->port_mutex);
>
> return error;
> }
> @@ -757,9 +761,9 @@ dpif_netdev_port_del(struct dpif *dpif, odp_port_t port_no)
> struct dp_netdev *dp = get_dp_netdev(dpif);
> int error;
>
> - ovs_rwlock_wrlock(&dp->port_rwlock);
> + ovs_mutex_lock(&dp->port_mutex);
> error = port_no == ODPP_LOCAL ? EINVAL : do_del_port(dp, port_no);
> - ovs_rwlock_unlock(&dp->port_rwlock);
> + ovs_mutex_unlock(&dp->port_mutex);
>
> return error;
> }
> @@ -772,12 +776,10 @@ is_valid_port_number(odp_port_t port_no)
>
> static struct dp_netdev_port *
> dp_netdev_lookup_port(const struct dp_netdev *dp, odp_port_t port_no)
> - OVS_REQ_RDLOCK(dp->port_rwlock)
> {
> struct dp_netdev_port *port;
>
> - HMAP_FOR_EACH_IN_BUCKET (port, node, hash_int(odp_to_u32(port_no), 0),
> - &dp->ports) {
> + CMAP_FOR_EACH_WITH_HASH (port, node, hash_port_no(port_no), &dp->ports) {
> if (port->port_no == port_no) {
> return port;
> }
> @@ -788,7 +790,6 @@ dp_netdev_lookup_port(const struct dp_netdev *dp, odp_port_t port_no)
> static int
> get_port_by_number(struct dp_netdev *dp,
> odp_port_t port_no, struct dp_netdev_port **portp)
> - OVS_REQ_RDLOCK(dp->port_rwlock)
> {
> if (!is_valid_port_number(port_no)) {
> *portp = NULL;
> @@ -808,33 +809,40 @@ port_ref(struct dp_netdev_port *port)
> }
>
> static void
> -port_unref(struct dp_netdev_port *port)
> +port_destroy__(struct dp_netdev_port *port)
> {
> - if (port && ovs_refcount_unref(&port->ref_cnt) == 1) {
> - int n_rxq;
> - int i;
> + int n_rxq;
> + int i;
>
> - netdev_close(port->netdev);
> - netdev_restore_flags(port->sf);
> + netdev_close(port->netdev);
> + netdev_restore_flags(port->sf);
>
> - n_rxq = netdev_n_rxq(port->netdev);
> - for (i = 0; i < n_rxq; i++) {
> - netdev_rxq_close(port->rxq[i]);
> - }
> - free(port->rxq);
> - free(port->type);
> - free(port);
> + n_rxq = netdev_n_rxq(port->netdev);
> + for (i = 0; i < n_rxq; i++) {
> + netdev_rxq_close(port->rxq[i]);
> + }
> + free(port->rxq);
> + free(port->type);
> + free(port);
> +}
> +
> +static void
> +port_unref(struct dp_netdev_port *port)
> +{
> + if (port && ovs_refcount_unref(&port->ref_cnt) == 1) {
> + ovsrcu_postpone(port_destroy__, port);
> }
> }
>
> static int
> get_port_by_name(struct dp_netdev *dp,
> const char *devname, struct dp_netdev_port **portp)
> - OVS_REQ_RDLOCK(dp->port_rwlock)
> + OVS_REQUIRES(dp->port_mutex)
> {
> struct dp_netdev_port *port;
> + struct cmap_cursor cursor;
>
> - HMAP_FOR_EACH (port, node, &dp->ports) {
> + CMAP_FOR_EACH (port, node, &cursor, &dp->ports) {
> if (!strcmp(netdev_get_name(port->netdev), devname)) {
> *portp = port;
> return 0;
> @@ -845,7 +853,7 @@ get_port_by_name(struct dp_netdev *dp,
>
> static int
> do_del_port(struct dp_netdev *dp, odp_port_t port_no)
> - OVS_REQ_WRLOCK(dp->port_rwlock)
> + OVS_REQUIRES(dp->port_mutex)
> {
> struct dp_netdev_port *port;
> int error;
> @@ -855,7 +863,7 @@ do_del_port(struct dp_netdev *dp, odp_port_t port_no)
> return error;
> }
>
> - hmap_remove(&dp->ports, &port->node);
> + cmap_remove(&dp->ports, &port->node, hash_odp_port(port_no));
> seq_change(dp->port_seq);
> if (netdev_is_pmd(port->netdev)) {
> dp_netdev_reload_pmd_threads(dp);
> @@ -882,12 +890,10 @@ dpif_netdev_port_query_by_number(const struct dpif *dpif, odp_port_t port_no,
> struct dp_netdev_port *port;
> int error;
>
> - ovs_rwlock_rdlock(&dp->port_rwlock);
> error = get_port_by_number(dp, port_no, &port);
> if (!error && dpif_port) {
> answer_port_query(port, dpif_port);
> }
> - ovs_rwlock_unlock(&dp->port_rwlock);
>
> return error;
> }
> @@ -900,12 +906,12 @@ dpif_netdev_port_query_by_name(const struct dpif *dpif, const char *devname,
> struct dp_netdev_port *port;
> int error;
>
> - ovs_rwlock_rdlock(&dp->port_rwlock);
> + ovs_mutex_lock(&dp->port_mutex);
> error = get_port_by_name(dp, devname, &port);
> if (!error && dpif_port) {
> answer_port_query(port, dpif_port);
> }
> - ovs_rwlock_unlock(&dp->port_rwlock);
> + ovs_mutex_unlock(&dp->port_mutex);
>
> return error;
> }
> @@ -964,8 +970,7 @@ dpif_netdev_flow_flush(struct dpif *dpif)
> }
>
> struct dp_netdev_port_state {
> - uint32_t bucket;
> - uint32_t offset;
> + struct cmap_position position;
> char *name;
> };
>
> @@ -982,11 +987,10 @@ dpif_netdev_port_dump_next(const struct dpif *dpif, void *state_,
> {
> struct dp_netdev_port_state *state = state_;
> struct dp_netdev *dp = get_dp_netdev(dpif);
> - struct hmap_node *node;
> + struct cmap_node *node;
> int retval;
>
> - ovs_rwlock_rdlock(&dp->port_rwlock);
> - node = hmap_at_position(&dp->ports, &state->bucket, &state->offset);
> + node = cmap_next_position(&dp->ports, &state->position);
> if (node) {
> struct dp_netdev_port *port;
>
> @@ -1002,7 +1006,6 @@ dpif_netdev_port_dump_next(const struct dpif *dpif, void *state_,
> } else {
> retval = EOF;
> }
> - ovs_rwlock_unlock(&dp->port_rwlock);
>
> return retval;
> }
> @@ -1530,10 +1533,8 @@ dpif_netdev_execute(struct dpif *dpif, struct dpif_execute *execute)
> miniflow_initialize(&key.flow, key.buf);
> miniflow_extract(execute->packet, md, &key.flow);
>
> - ovs_rwlock_rdlock(&dp->port_rwlock);
> dp_netdev_execute_actions(dp, &key.flow, execute->packet, false, md,
> execute->actions, execute->actions_len);
> - ovs_rwlock_unlock(&dp->port_rwlock);
>
> return 0;
> }
> @@ -1772,10 +1773,9 @@ dpif_netdev_run(struct dpif *dpif)
> {
> struct dp_netdev_port *port;
> struct dp_netdev *dp = get_dp_netdev(dpif);
> + struct cmap_cursor cursor;
>
> - ovs_rwlock_rdlock(&dp->port_rwlock);
> -
> - HMAP_FOR_EACH (port, node, &dp->ports) {
> + CMAP_FOR_EACH (port, node, &cursor, &dp->ports) {
> if (!netdev_is_pmd(port->netdev)) {
> int i;
>
> @@ -1784,8 +1784,6 @@ dpif_netdev_run(struct dpif *dpif)
> }
> }
> }
> -
> - ovs_rwlock_unlock(&dp->port_rwlock);
> }
>
> static void
> @@ -1793,10 +1791,10 @@ dpif_netdev_wait(struct dpif *dpif)
> {
> struct dp_netdev_port *port;
> struct dp_netdev *dp = get_dp_netdev(dpif);
> + struct cmap_cursor cursor;
>
> - ovs_rwlock_rdlock(&dp->port_rwlock);
> -
> - HMAP_FOR_EACH (port, node, &dp->ports) {
> + ovs_mutex_lock(&dp_netdev_mutex);
> + CMAP_FOR_EACH (port, node, &cursor, &dp->ports) {
> if (!netdev_is_pmd(port->netdev)) {
> int i;
>
> @@ -1805,7 +1803,7 @@ dpif_netdev_wait(struct dpif *dpif)
> }
> }
> }
> - ovs_rwlock_unlock(&dp->port_rwlock);
> + ovs_mutex_unlock(&dp_netdev_mutex);
> }
>
> struct rxq_poll {
> @@ -1820,12 +1818,12 @@ pmd_load_queues(struct pmd_thread *f,
> struct dp_netdev *dp = f->dp;
> struct rxq_poll *poll_list = *ppoll_list;
> struct dp_netdev_port *port;
> + struct cmap_cursor cursor;
> int id = f->id;
> int index;
> int i;
>
> /* Simple scheduler for netdev rx polling. */
> - ovs_rwlock_rdlock(&dp->port_rwlock);
> for (i = 0; i < poll_cnt; i++) {
> port_unref(poll_list[i].port);
> }
> @@ -1833,7 +1831,7 @@ pmd_load_queues(struct pmd_thread *f,
> poll_cnt = 0;
> index = 0;
>
> - HMAP_FOR_EACH (port, node, &f->dp->ports) {
> + CMAP_FOR_EACH (port, node, &cursor, &f->dp->ports) {
> if (netdev_is_pmd(port->netdev)) {
> int i;
>
> @@ -1851,7 +1849,6 @@ pmd_load_queues(struct pmd_thread *f,
> }
> }
>
> - ovs_rwlock_unlock(&dp->port_rwlock);
> *ppoll_list = poll_list;
> return poll_cnt;
> }
> @@ -1997,7 +1994,6 @@ dp_netdev_count_packet(struct dp_netdev *dp, enum dp_stat_type type)
> static void
> dp_netdev_input(struct dp_netdev *dp, struct ofpbuf *packet,
> struct pkt_metadata *md)
> - OVS_REQ_RDLOCK(dp->port_rwlock)
> {
> struct dp_netdev_flow *netdev_flow;
> struct {
> @@ -2035,7 +2031,6 @@ dp_netdev_input(struct dp_netdev *dp, struct ofpbuf *packet,
> static void
> dp_netdev_port_input(struct dp_netdev *dp, struct ofpbuf *packet,
> struct pkt_metadata *md)
> - OVS_REQ_RDLOCK(dp->port_rwlock)
> {
> uint32_t *recirc_depth = recirc_depth_get();
>
> @@ -2248,7 +2243,8 @@ static void
> dpif_dummy_change_port_number(struct unixctl_conn *conn, int argc OVS_UNUSED,
> const char *argv[], void *aux OVS_UNUSED)
> {
> - struct dp_netdev_port *port;
> + struct dp_netdev_port *old_port;
> + struct dp_netdev_port *new_port;
> struct dp_netdev *dp;
> odp_port_t port_no;
>
> @@ -2262,8 +2258,8 @@ dpif_dummy_change_port_number(struct unixctl_conn *conn, int argc OVS_UNUSED,
> ovs_refcount_ref(&dp->ref_cnt);
> ovs_mutex_unlock(&dp_netdev_mutex);
>
> - ovs_rwlock_wrlock(&dp->port_rwlock);
> - if (get_port_by_name(dp, argv[2], &port)) {
> + ovs_mutex_lock(&dp->port_mutex);
> + if (get_port_by_name(dp, argv[2], &old_port)) {
> unixctl_command_reply_error(conn, "unknown port");
> goto exit;
> }
> @@ -2277,14 +2273,21 @@ dpif_dummy_change_port_number(struct unixctl_conn *conn, int argc OVS_UNUSED,
> unixctl_command_reply_error(conn, "port number already in use");
> goto exit;
> }
> - hmap_remove(&dp->ports, &port->node);
> - port->port_no = port_no;
> - hmap_insert(&dp->ports, &port->node, hash_int(odp_to_u32(port_no), 0));
> +
> + /* Remove old port. */
> + cmap_remove(&dp->ports, &old_port->node, hash_port_no(old_port->port_no));
> + 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));
> +
> seq_change(dp->port_seq);
> unixctl_command_reply(conn, NULL);
>
> exit:
> - ovs_rwlock_unlock(&dp->port_rwlock);
> + ovs_mutex_unlock(&dp->port_mutex);
> dp_netdev_unref(dp);
> }
>
> --
> 1.7.10.4
>
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