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bnx2x: protect different statistics flows

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Add locking to protect different statistics flows from
running simultaneously.
This in order to serialize statistics requests sent to FW,
otherwise two outstanding queries may cause FW assert.

Signed-off-by: Dmitry Kravkov <dmitry@broadcom.com>
Signed-off-by: Ariel Elior <ariele@broadcom.com>
Signed-off-by: Eilon Greenstein <eilong@broadcom.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dmitry Kravkov 2013-08-13 02:24:59 +03:00 committed by David S. Miller
parent 205057aeb3
commit 507393eb29
3 changed files with 57 additions and 12 deletions
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2
drivers/net/ethernet/broadcom/bnx2x/bnx2x.h
View File

@ -1830,6 +1830,8 @@ struct bnx2x {
int fp_array_size;
u32 dump_preset_idx;
bool stats_started;
struct semaphore stats_sema;
};
/* Tx queues may be less or equal to Rx queues */

1
drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c
View File

@ -11524,6 +11524,7 @@ static int bnx2x_init_bp(struct bnx2x *bp)
mutex_init(&bp->port.phy_mutex);
mutex_init(&bp->fw_mb_mutex);
spin_lock_init(&bp->stats_lock);
sema_init(&bp->stats_sema, 1);
INIT_DELAYED_WORK(&bp->sp_task, bnx2x_sp_task);
INIT_DELAYED_WORK(&bp->sp_rtnl_task, bnx2x_sp_rtnl_task);

66
drivers/net/ethernet/broadcom/bnx2x/bnx2x_stats.c
View File

@ -221,7 +221,8 @@ static int bnx2x_stats_comp(struct bnx2x *bp)
* Statistics service functions
*/
static void bnx2x_stats_pmf_update(struct bnx2x *bp)
/* should be called under stats_sema */
static void __bnx2x_stats_pmf_update(struct bnx2x *bp)
{
struct dmae_command *dmae;
u32 opcode;
@ -518,7 +519,8 @@ static void bnx2x_func_stats_init(struct bnx2x *bp)
*stats_comp = 0;
}
static void bnx2x_stats_start(struct bnx2x *bp)
/* should be called under stats_sema */
static void __bnx2x_stats_start(struct bnx2x *bp)
{
/* vfs travel through here as part of the statistics FSM, but no action
* is required
@ -534,13 +536,34 @@ static void bnx2x_stats_start(struct bnx2x *bp)
bnx2x_hw_stats_post(bp);
bnx2x_storm_stats_post(bp);
bp->stats_started = true;
}
static void bnx2x_stats_start(struct bnx2x *bp)
{
if (down_timeout(&bp->stats_sema, HZ/10))
BNX2X_ERR("Unable to acquire stats lock\n");
__bnx2x_stats_start(bp);
up(&bp->stats_sema);
}
static void bnx2x_stats_pmf_start(struct bnx2x *bp)
{
if (down_timeout(&bp->stats_sema, HZ/10))
BNX2X_ERR("Unable to acquire stats lock\n");
bnx2x_stats_comp(bp);
bnx2x_stats_pmf_update(bp);
bnx2x_stats_start(bp);
__bnx2x_stats_pmf_update(bp);
__bnx2x_stats_start(bp);
up(&bp->stats_sema);
}
static void bnx2x_stats_pmf_update(struct bnx2x *bp)
{
if (down_timeout(&bp->stats_sema, HZ/10))
BNX2X_ERR("Unable to acquire stats lock\n");
__bnx2x_stats_pmf_update(bp);
up(&bp->stats_sema);
}
static void bnx2x_stats_restart(struct bnx2x *bp)
@ -550,8 +573,11 @@ static void bnx2x_stats_restart(struct bnx2x *bp)
*/
if (IS_VF(bp))
return;
if (down_timeout(&bp->stats_sema, HZ/10))
BNX2X_ERR("Unable to acquire stats lock\n");
bnx2x_stats_comp(bp);
bnx2x_stats_start(bp);
__bnx2x_stats_start(bp);
up(&bp->stats_sema);
}
static void bnx2x_bmac_stats_update(struct bnx2x *bp)
@ -888,9 +914,7 @@ static int bnx2x_storm_stats_validate_counters(struct bnx2x *bp)
/* Make sure we use the value of the counter
* used for sending the last stats ramrod.
*/
spin_lock_bh(&bp->stats_lock);
cur_stats_counter = bp->stats_counter - 1;
spin_unlock_bh(&bp->stats_lock);
/* are storm stats valid? */
if (le16_to_cpu(counters->xstats_counter) != cur_stats_counter) {
@ -1227,12 +1251,18 @@ static void bnx2x_stats_update(struct bnx2x *bp)
{
u32 *stats_comp = bnx2x_sp(bp, stats_comp);
if (bnx2x_edebug_stats_stopped(bp))
/* we run update from timer context, so give up
* if somebody is in the middle of transition
*/
if (down_trylock(&bp->stats_sema))
return;
if (bnx2x_edebug_stats_stopped(bp) || !bp->stats_started)
goto out;
if (IS_PF(bp)) {
if (*stats_comp != DMAE_COMP_VAL)
return;
goto out;
if (bp->port.pmf)
bnx2x_hw_stats_update(bp);
@ -1242,7 +1272,7 @@ static void bnx2x_stats_update(struct bnx2x *bp)
BNX2X_ERR("storm stats were not updated for 3 times\n");
bnx2x_panic();
}
return;
goto out;
}
} else {
/* vf doesn't collect HW statistics, and doesn't get completions
@ -1256,7 +1286,7 @@ static void bnx2x_stats_update(struct bnx2x *bp)
/* vf is done */
if (IS_VF(bp))
return;
goto out;
if (netif_msg_timer(bp)) {
struct bnx2x_eth_stats *estats = &bp->eth_stats;
@ -1267,6 +1297,9 @@ static void bnx2x_stats_update(struct bnx2x *bp)
bnx2x_hw_stats_post(bp);
bnx2x_storm_stats_post(bp);
out:
up(&bp->stats_sema);
}
static void bnx2x_port_stats_stop(struct bnx2x *bp)
@ -1332,6 +1365,11 @@ static void bnx2x_stats_stop(struct bnx2x *bp)
{
int update = 0;
if (down_timeout(&bp->stats_sema, HZ/10))
BNX2X_ERR("Unable to acquire stats lock\n");
bp->stats_started = false;
bnx2x_stats_comp(bp);
if (bp->port.pmf)
@ -1348,6 +1386,8 @@ static void bnx2x_stats_stop(struct bnx2x *bp)
bnx2x_hw_stats_post(bp);
bnx2x_stats_comp(bp);
}
up(&bp->stats_sema);
}
static void bnx2x_stats_do_nothing(struct bnx2x *bp)
@ -1376,15 +1416,17 @@ static const struct {
void bnx2x_stats_handle(struct bnx2x *bp, enum bnx2x_stats_event event)
{
enum bnx2x_stats_state state;
void (*action)(struct bnx2x *bp);
if (unlikely(bp->panic))
return;
spin_lock_bh(&bp->stats_lock);
state = bp->stats_state;
bp->stats_state = bnx2x_stats_stm[state][event].next_state;
action = bnx2x_stats_stm[state][event].action;
spin_unlock_bh(&bp->stats_lock);
bnx2x_stats_stm[state][event].action(bp);
action(bp);
if ((event != STATS_EVENT_UPDATE) || netif_msg_timer(bp))
DP(BNX2X_MSG_STATS, "state %d -> event %d -> state %d\n",