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iwlwifi: cleanup iwl_good_ack_health 

Make ack health code easies to read. Compared to previous
code, we do not print debug messages when expected_ack_cnt_delta == 0
and also do check against negative deltas.

Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Acked-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Stanislaw Gruszka 2011-02-08 09:31:57 +01:00 committed by John W. Linville
parent ca3d938964
commit f266526da4
1 changed files with 34 additions and 33 deletions
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67
drivers/net/wireless/iwlwifi/iwl-agn.c
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@ -1407,34 +1407,37 @@ static void iwl_irq_tasklet(struct iwl_priv *priv)
/**
* iwl_good_ack_health - checks for ACK count ratios, BA timeout retries.
*
* When the ACK count ratio is 0 and aggregated BA timeout retries exceeding
* When the ACK count ratio is low and aggregated BA timeout retries exceeding
* the BA_TIMEOUT_MAX, reload firmware and bring system back to normal
* operation state.
*/
bool iwl_good_ack_health(struct iwl_priv *priv,
struct iwl_rx_packet *pkt)
bool iwl_good_ack_health(struct iwl_priv *priv, struct iwl_rx_packet *pkt)
{
bool rc = true;
int actual_ack_cnt_delta, expected_ack_cnt_delta;
int ba_timeout_delta;
int actual_delta, expected_delta, ba_timeout_delta;
struct statistics_tx *cur, *old;
actual_ack_cnt_delta =
le32_to_cpu(pkt->u.stats.tx.actual_ack_cnt) -
le32_to_cpu(priv->_agn.statistics.tx.actual_ack_cnt);
expected_ack_cnt_delta =
le32_to_cpu(pkt->u.stats.tx.expected_ack_cnt) -
le32_to_cpu(priv->_agn.statistics.tx.expected_ack_cnt);
ba_timeout_delta =
le32_to_cpu(pkt->u.stats.tx.agg.ba_timeout) -
le32_to_cpu(priv->_agn.statistics.tx.agg.ba_timeout);
if ((priv->_agn.agg_tids_count > 0) &&
(expected_ack_cnt_delta > 0) &&
(((actual_ack_cnt_delta * 100) / expected_ack_cnt_delta)
< ACK_CNT_RATIO) &&
(ba_timeout_delta > BA_TIMEOUT_CNT)) {
IWL_DEBUG_RADIO(priv, "actual_ack_cnt delta = %d,"
" expected_ack_cnt = %d\n",
actual_ack_cnt_delta, expected_ack_cnt_delta);
if (priv->_agn.agg_tids_count)
return true;
cur = &pkt->u.stats.tx;
old = &priv->_agn.statistics.tx;
actual_delta = le32_to_cpu(cur->actual_ack_cnt) -
le32_to_cpu(old->actual_ack_cnt);
expected_delta = le32_to_cpu(cur->expected_ack_cnt) -
le32_to_cpu(old->expected_ack_cnt);
/* Values should not be negative, but we do not trust the firmware */
if (actual_delta <= 0 || expected_delta <= 0)
return true;
ba_timeout_delta = le32_to_cpu(cur->agg.ba_timeout) -
le32_to_cpu(old->agg.ba_timeout);
if ((actual_delta * 100 / expected_delta) < ACK_CNT_RATIO &&
ba_timeout_delta > BA_TIMEOUT_CNT) {
IWL_DEBUG_RADIO(priv, "deltas: actual %d expected %d ba_timeout %d\n",
actual_delta, expected_delta, ba_timeout_delta);
#ifdef CONFIG_IWLWIFI_DEBUGFS
/*
@ -1442,20 +1445,18 @@ bool iwl_good_ack_health(struct iwl_priv *priv,
* statistics aren't available. If DEBUGFS is set but
* DEBUG is not, these will just compile out.
*/
IWL_DEBUG_RADIO(priv, "rx_detected_cnt delta = %d\n",
IWL_DEBUG_RADIO(priv, "rx_detected_cnt delta %d\n",
priv->_agn.delta_statistics.tx.rx_detected_cnt);
IWL_DEBUG_RADIO(priv,
"ack_or_ba_timeout_collision delta = %d\n",
priv->_agn.delta_statistics.tx.
ack_or_ba_timeout_collision);
"ack_or_ba_timeout_collision delta %d\n",
priv->_agn.delta_statistics.tx.ack_or_ba_timeout_collision);
#endif
IWL_DEBUG_RADIO(priv, "agg ba_timeout delta = %d\n",
ba_timeout_delta);
if (!actual_ack_cnt_delta &&
(ba_timeout_delta >= BA_TIMEOUT_MAX))
rc = false;
if (ba_timeout_delta >= BA_TIMEOUT_MAX)
return false;
}
return rc;
return true;
}