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iwlwifi: add FreeBSD specific debugging

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"Invalid TXQ id" and "Queue <n> is stuck <x> <y>" are two errors seen
more commonly by FreeBSD users.  Try to gather some extra data the
"easy way" adding more error logging for these situations in the hope
to find a clue or at least do more targetd debugging in the future.
Note that for one of the errors the Linux Intel driver has a TODO to
print register data.  If that will show up in future versions of the
driver this may also help.

Sponsored by:	The FreeBSD Foundation
MFC after:	3 days
This commit is contained in:
Bjoern A. Zeeb 2022-08-17 16:11:47 +00:00
parent 489482e276
commit e674ddec0b
2 changed files with 18 additions and 0 deletions
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5
sys/contrib/dev/iwlwifi/mvm/tx.c
View file

@ -1139,6 +1139,11 @@ static int iwl_mvm_tx_mpdu(struct iwl_mvm *mvm, struct sk_buff *skb,
WARN_ON_ONCE(info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM);
if (WARN_ONCE(txq_id == IWL_MVM_INVALID_QUEUE, "Invalid TXQ id")) {
#if defined(__FreeBSD__)
IWL_ERR(mvm, "fc %#06x sta_id %u tid %u txq_id %u mvm %p "
"skb %p { len %u } info %p sta %p\n", fc, mvmsta->sta_id,
tid, txq_id, mvm, skb, skb->len, info, sta);
#endif
iwl_trans_free_tx_cmd(mvm->trans, dev_cmd);
spin_unlock(&mvmsta->lock);
return -1;

13
sys/contrib/dev/iwlwifi/queue/tx.c
View file

@ -988,6 +988,19 @@ void iwl_txq_log_scd_error(struct iwl_trans *trans, struct iwl_txq *txq)
if (trans->trans_cfg->use_tfh) {
IWL_ERR(trans, "Queue %d is stuck %d %d\n", txq_id,
txq->read_ptr, txq->write_ptr);
#if defined(__FreeBSD__)
/*
* Dump some more queue and timer information to rule
* out a LinuxKPI issues and gather some extra data.
*/
IWL_ERR(trans, " need_update %d frozen %d ampdu %d "
"now %ju stuck_timer.expires %ju "
"frozen_expiry_remainder %ju wd_timeout %ju\n",
txq->need_update, txq->frozen, txq->ampdu,
(uintmax_t)jiffies, (uintmax_t)txq->stuck_timer.expires,
(uintmax_t)txq->frozen_expiry_remainder,
(uintmax_t)txq->wd_timeout);
#endif
/* TODO: access new SCD registers and dump them */
return;
}