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team: remove synchronize_rcu() called during queue override change 

This patch removes synchronize_rcu() from function
__team_queue_override_port_del(). That can be done because it is ok to
do list_del_rcu() and list_add_tail_rcu() on the same list_head member
without calling synchronize_rcu() in between. A bit of refactoring
needed to be done because INIT_LIST_HEAD needed to be removed (to not
kill the forward pointer) as well.

Signed-off-by: Jiri Pirko <jiri@resnulli.us>
Acked-by: Flavio Leitner <fbl@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jiri Pirko 2013-06-10 17:42:23 +02:00 committed by David S. Miller
parent dffebd2c5c
commit 6c31ff366c
1 changed files with 47 additions and 16 deletions
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63
drivers/net/team/team.c
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@ -725,9 +725,9 @@ static bool team_queue_override_transmit(struct team *team, struct sk_buff *skb)
static void __team_queue_override_port_del(struct team *team,
struct team_port *port)
{
if (!port->queue_id)
return;
list_del_rcu(&port->qom_list);
synchronize_rcu();
INIT_LIST_HEAD(&port->qom_list);
}
static bool team_queue_override_port_has_gt_prio_than(struct team_port *port,
@ -749,9 +749,8 @@ static void __team_queue_override_port_add(struct team *team,
struct list_head *qom_list;
struct list_head *node;
if (!port->queue_id || !team_port_enabled(port))
if (!port->queue_id)
return;
qom_list = __team_get_qom_list(team, port->queue_id);
node = qom_list;
list_for_each_entry(cur, qom_list, qom_list) {
@ -768,7 +767,7 @@ static void __team_queue_override_enabled_check(struct team *team)
bool enabled = false;
list_for_each_entry(port, &team->port_list, list) {
if (!list_empty(&port->qom_list)) {
if (port->queue_id) {
enabled = true;
break;
}
@ -780,14 +779,44 @@ static void __team_queue_override_enabled_check(struct team *team)
team->queue_override_enabled = enabled;
}
static void team_queue_override_port_refresh(struct team *team,
struct team_port *port)
static void team_queue_override_port_prio_changed(struct team *team,
struct team_port *port)
{
if (!port->queue_id || team_port_enabled(port))
return;
__team_queue_override_port_del(team, port);
__team_queue_override_port_add(team, port);
__team_queue_override_enabled_check(team);
}
static void team_queue_override_port_change_queue_id(struct team *team,
struct team_port *port,
u16 new_queue_id)
{
if (team_port_enabled(port)) {
__team_queue_override_port_del(team, port);
port->queue_id = new_queue_id;
__team_queue_override_port_add(team, port);
__team_queue_override_enabled_check(team);
} else {
port->queue_id = new_queue_id;
}
}
static void team_queue_override_port_add(struct team *team,
struct team_port *port)
{
__team_queue_override_port_add(team, port);
__team_queue_override_enabled_check(team);
}
static void team_queue_override_port_del(struct team *team,
struct team_port *port)
{
__team_queue_override_port_del(team, port);
__team_queue_override_enabled_check(team);
}
/****************
* Port handling
@ -819,7 +848,7 @@ static void team_port_enable(struct team *team,
hlist_add_head_rcu(&port->hlist,
team_port_index_hash(team, port->index));
team_adjust_ops(team);
team_queue_override_port_refresh(team, port);
team_queue_override_port_add(team, port);
if (team->ops.port_enabled)
team->ops.port_enabled(team, port);
}
@ -848,7 +877,7 @@ static void team_port_disable(struct team *team,
hlist_del_rcu(&port->hlist);
__reconstruct_port_hlist(team, port->index);
port->index = -1;
team_queue_override_port_refresh(team, port);
team_queue_override_port_del(team, port);
__team_adjust_ops(team, team->en_port_count - 1);
/*
* Wait until readers see adjusted ops. This ensures that
@ -1259,9 +1288,12 @@ static int team_priority_option_set(struct team *team,
struct team_gsetter_ctx *ctx)
{
struct team_port *port = ctx->info->port;
s32 priority = ctx->data.s32_val;
port->priority = ctx->data.s32_val;
team_queue_override_port_refresh(team, port);
if (port->priority == priority)
return 0;
port->priority = priority;
team_queue_override_port_prio_changed(team, port);
return 0;
}
@ -1278,17 +1310,16 @@ static int team_queue_id_option_set(struct team *team,
struct team_gsetter_ctx *ctx)
{
struct team_port *port = ctx->info->port;
u16 new_queue_id = ctx->data.u32_val;
if (port->queue_id == ctx->data.u32_val)
if (port->queue_id == new_queue_id)
return 0;
if (ctx->data.u32_val >= team->dev->real_num_tx_queues)
if (new_queue_id >= team->dev->real_num_tx_queues)
return -EINVAL;
port->queue_id = ctx->data.u32_val;
team_queue_override_port_refresh(team, port);
team_queue_override_port_change_queue_id(team, port, new_queue_id);
return 0;
}
static const struct team_option team_options[] = {
{
.name = "mode",