iwlwifi: pcie: properly implement NAPI

Instead of pretending to have NAPI and then relying entirely on
interrupts anyway, properly implement NAPI and schedule the poll
when we get an interrupt, re-enabling the interrupt only after
the poll completed.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Link: https://lore.kernel.org/r/iwlwifi.20210117130510.a5951ac4fc06.I9c84a147288fcfb1b019572c6758f2d92949f5d7@changeidSigned-off-by: Luca Coelho <luciano.coelho@intel.com>

drivers/net/wireless/intel/iwlwifi/pcie/internal.h

@@ -418,8 +418,7 @@ IWL_TRANS_GET_PCIE_TRANS(struct iwl_trans *trans)
 	return (void *)trans->trans_specific;
 }
 
-static inline void iwl_pcie_clear_irq(struct iwl_trans *trans,
-				      struct msix_entry *entry)
+static inline void iwl_pcie_clear_irq(struct iwl_trans *trans, int queue)
 {
 	/*
 	 * Before sending the interrupt the HW disables it to prevent
@@ -429,7 +428,7 @@ static inline void iwl_pcie_clear_irq(struct iwl_trans *trans,
 	 * write 1 clear (W1C) register, meaning that it's being clear
 	 * by writing 1 to the bit.
 	 */
-	iwl_write32(trans, CSR_MSIX_AUTOMASK_ST_AD, BIT(entry->entry));
+	iwl_write32(trans, CSR_MSIX_AUTOMASK_ST_AD, BIT(queue));
 }
 
 static inline struct iwl_trans *
@@ -462,7 +461,6 @@ int iwl_pcie_rx_stop(struct iwl_trans *trans);
 void iwl_pcie_rx_free(struct iwl_trans *trans);
 void iwl_pcie_free_rbs_pool(struct iwl_trans *trans);
 void iwl_pcie_rx_init_rxb_lists(struct iwl_rxq *rxq);
-int iwl_pcie_dummy_napi_poll(struct napi_struct *napi, int budget);
 void iwl_pcie_rxq_alloc_rbs(struct iwl_trans *trans, gfp_t priority,
 			    struct iwl_rxq *rxq);
 
@@ -569,9 +567,9 @@ static inline void iwl_disable_interrupts(struct iwl_trans *trans)
 {
 	struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
 
-	spin_lock(&trans_pcie->irq_lock);
+	spin_lock_bh(&trans_pcie->irq_lock);
 	_iwl_disable_interrupts(trans);
-	spin_unlock(&trans_pcie->irq_lock);
+	spin_unlock_bh(&trans_pcie->irq_lock);
 }
 
 static inline void _iwl_enable_interrupts(struct iwl_trans *trans)
@@ -601,9 +599,9 @@ static inline void iwl_enable_interrupts(struct iwl_trans *trans)
 {
 	struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
 
-	spin_lock(&trans_pcie->irq_lock);
+	spin_lock_bh(&trans_pcie->irq_lock);
 	_iwl_enable_interrupts(trans);
-	spin_unlock(&trans_pcie->irq_lock);
+	spin_unlock_bh(&trans_pcie->irq_lock);
 }
 static inline void iwl_enable_hw_int_msk_msix(struct iwl_trans *trans, u32 msk)
 {

drivers/net/wireless/intel/iwlwifi/pcie/trans-gen2.c

@@ -213,9 +213,9 @@ static int iwl_pcie_gen2_nic_init(struct iwl_trans *trans)
 			       trans->cfg->min_txq_size);
 
 	/* TODO: most of the logic can be removed in A0 - but not in Z0 */
-	spin_lock(&trans_pcie->irq_lock);
+	spin_lock_bh(&trans_pcie->irq_lock);
 	iwl_pcie_gen2_apm_init(trans);
-	spin_unlock(&trans_pcie->irq_lock);
+	spin_unlock_bh(&trans_pcie->irq_lock);
 
 	iwl_op_mode_nic_config(trans->op_mode);
 

drivers/net/wireless/intel/iwlwifi/pcie/trans.c

@@ -511,9 +511,9 @@ static int iwl_pcie_nic_init(struct iwl_trans *trans)
 	int ret;
 
 	/* nic_init */
-	spin_lock(&trans_pcie->irq_lock);
+	spin_lock_bh(&trans_pcie->irq_lock);
 	ret = iwl_pcie_apm_init(trans);
-	spin_unlock(&trans_pcie->irq_lock);
+	spin_unlock_bh(&trans_pcie->irq_lock);
 
 	if (ret)
 		return ret;

drivers/net/wireless/intel/iwlwifi/pcie/tx.c

@@ -393,7 +393,7 @@ static void iwl_pcie_tx_stop_fh(struct iwl_trans *trans)
 	int ch, ret;
 	u32 mask = 0;
 
-	spin_lock(&trans_pcie->irq_lock);
+	spin_lock_bh(&trans_pcie->irq_lock);
 
 	if (!iwl_trans_grab_nic_access(trans, &flags))
 		goto out;
@@ -414,7 +414,7 @@ static void iwl_pcie_tx_stop_fh(struct iwl_trans *trans)
 	iwl_trans_release_nic_access(trans, &flags);
 
 out:
-	spin_unlock(&trans_pcie->irq_lock);
+	spin_unlock_bh(&trans_pcie->irq_lock);
 }
 
 /*
@@ -571,7 +571,7 @@ int iwl_pcie_tx_init(struct iwl_trans *trans)
 		alloc = true;
 	}
 
-	spin_lock(&trans_pcie->irq_lock);
+	spin_lock_bh(&trans_pcie->irq_lock);
 
 	/* Turn off all Tx DMA fifos */
 	iwl_scd_deactivate_fifos(trans);
@@ -580,7 +580,7 @@ int iwl_pcie_tx_init(struct iwl_trans *trans)
 	iwl_write_direct32(trans, FH_KW_MEM_ADDR_REG,
 			   trans_pcie->kw.dma >> 4);
 
-	spin_unlock(&trans_pcie->irq_lock);
+	spin_unlock_bh(&trans_pcie->irq_lock);
 
 	/* Alloc and init all Tx queues, including the command queue (#4/#9) */
 	for (txq_id = 0; txq_id < trans->trans_cfg->base_params->num_of_queues;