iwlwifi: mvm: don't update quota in firmware too often
When updating quota in the firmware, it has to reset quite a bit
of internal state, which apparently can have an adverse impact on
its operation.
Avoid that by only updating the quota command when there are any
signification changes, i.e. added/removed bindings or changes in
quota that are bigger than 8 TU within a binding.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
diff --git a/drivers/net/wireless/iwlwifi/mvm/quota.c b/drivers/net/wireless/iwlwifi/mvm/quota.c
index 5fd502d..1eab2f2 100644
--- a/drivers/net/wireless/iwlwifi/mvm/quota.c
+++ b/drivers/net/wireless/iwlwifi/mvm/quota.c
@@ -175,12 +175,14 @@
struct ieee80211_vif *disabled_vif)
{
struct iwl_time_quota_cmd cmd = {};
- int i, idx, ret, num_active_macs, quota, quota_rem, n_non_lowlat;
+ int i, idx, err, num_active_macs, quota, quota_rem, n_non_lowlat;
struct iwl_mvm_quota_iterator_data data = {
.n_interfaces = {},
.colors = { -1, -1, -1, -1 },
.disabled_vif = disabled_vif,
};
+ struct iwl_time_quota_cmd *last = &mvm->last_quota_cmd;
+ bool send = false;
lockdep_assert_held(&mvm->mutex);
@@ -293,15 +295,34 @@
/* check that we have non-zero quota for all valid bindings */
for (i = 0; i < MAX_BINDINGS; i++) {
+ if (cmd.quotas[i].id_and_color != last->quotas[i].id_and_color)
+ send = true;
+ if (cmd.quotas[i].max_duration != last->quotas[i].max_duration)
+ send = true;
+ if (abs((int)le32_to_cpu(cmd.quotas[i].quota) -
+ (int)le32_to_cpu(last->quotas[i].quota))
+ > IWL_MVM_QUOTA_THRESHOLD)
+ send = true;
if (cmd.quotas[i].id_and_color == cpu_to_le32(FW_CTXT_INVALID))
continue;
WARN_ONCE(cmd.quotas[i].quota == 0,
"zero quota on binding %d\n", i);
}
- ret = iwl_mvm_send_cmd_pdu(mvm, TIME_QUOTA_CMD, 0,
- sizeof(cmd), &cmd);
- if (ret)
- IWL_ERR(mvm, "Failed to send quota: %d\n", ret);
- return ret;
+ if (send) {
+ err = iwl_mvm_send_cmd_pdu(mvm, TIME_QUOTA_CMD, 0,
+ sizeof(cmd), &cmd);
+ } else {
+ /* don't send a practically unchanged command, the firmware has
+ * to re-initialize a lot of state and that can have an adverse
+ * impact on it
+ */
+ err = 0;
+ }
+
+ if (err)
+ IWL_ERR(mvm, "Failed to send quota: %d\n", err);
+ else
+ mvm->last_quota_cmd = cmd;
+ return err;
}