qlcnic: Support atomic commands

o VFs might get scheduled out after sending a command to a PF
  and scheduled in after receiving a response. Implement a
  worker thread to handle atomic commands.

Signed-off-by: Manish Chopra <manish.chopra@qlogic.com>
Signed-off-by: Rajesh Borundia <rajesh.borundia@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/qlogic/qlcnic/qlcnic.h

@@ -1013,6 +1013,7 @@ struct qlcnic_adapter {
 
 	struct qlcnic_filter_hash fhash;
 	struct qlcnic_filter_hash rx_fhash;
+	struct list_head vf_mc_list;
 
 	spinlock_t tx_clean_lock;
 	spinlock_t mac_learn_lock;
@@ -1443,6 +1444,7 @@ void qlcnic_post_rx_buffers(struct qlcnic_adapter *adapter,
 		struct qlcnic_host_rds_ring *rds_ring, u8 ring_id);
 int qlcnic_process_rcv_ring(struct qlcnic_host_sds_ring *sds_ring, int max);
 void qlcnic_set_multi(struct net_device *netdev);
+void __qlcnic_set_multi(struct net_device *netdev);
 int qlcnic_nic_add_mac(struct qlcnic_adapter *, const u8 *);
 int qlcnic_nic_del_mac(struct qlcnic_adapter *, const u8 *);
 void qlcnic_free_mac_list(struct qlcnic_adapter *adapter);
@@ -1527,6 +1529,8 @@ void qlcnic_add_lb_filter(struct qlcnic_adapter *, struct sk_buff *, int,
 int qlcnic_83xx_configure_opmode(struct qlcnic_adapter *adapter);
 int qlcnic_read_mac_addr(struct qlcnic_adapter *);
 int qlcnic_setup_netdev(struct qlcnic_adapter *, struct net_device *, int);
+void qlcnic_sriov_vf_schedule_multi(struct net_device *);
+void qlcnic_vf_add_mc_list(struct net_device *);
 
 /*
  * QLOGIC Board information

drivers/net/ethernet/qlogic/qlcnic/qlcnic_hw.c

@@ -496,7 +496,7 @@ int qlcnic_nic_add_mac(struct qlcnic_adapter *adapter, const u8 *addr)
 	return 0;
 }
 
-void qlcnic_set_multi(struct net_device *netdev)
+void __qlcnic_set_multi(struct net_device *netdev)
 {
 	struct qlcnic_adapter *adapter = netdev_priv(netdev);
 	struct netdev_hw_addr *ha;
@@ -508,6 +508,7 @@ void qlcnic_set_multi(struct net_device *netdev)
 	if (!test_bit(__QLCNIC_FW_ATTACHED, &adapter->state))
 		return;
 
+	if (!qlcnic_sriov_vf_check(adapter))
 		qlcnic_nic_add_mac(adapter, adapter->mac_addr);
 	qlcnic_nic_add_mac(adapter, bcast_addr);
 
@@ -523,23 +524,53 @@ void qlcnic_set_multi(struct net_device *netdev)
 		goto send_fw_cmd;
 	}
 
-	if (!netdev_mc_empty(netdev)) {
+	if (!netdev_mc_empty(netdev) && !qlcnic_sriov_vf_check(adapter)) {
 		netdev_for_each_mc_addr(ha, netdev) {
 			qlcnic_nic_add_mac(adapter, ha->addr);
 		}
 	}
 
+	if (qlcnic_sriov_vf_check(adapter))
+		qlcnic_vf_add_mc_list(netdev);
+
 send_fw_cmd:
-	if (mode == VPORT_MISS_MODE_ACCEPT_ALL && !adapter->fdb_mac_learn) {
+	if (!qlcnic_sriov_vf_check(adapter)) {
+		if (mode == VPORT_MISS_MODE_ACCEPT_ALL &&
+		    !adapter->fdb_mac_learn) {
 			qlcnic_alloc_lb_filters_mem(adapter);
 			adapter->drv_mac_learn = true;
 		} else {
 			adapter->drv_mac_learn = false;
 		}
+	}
 
 	qlcnic_nic_set_promisc(adapter, mode);
 }
 
+void qlcnic_set_multi(struct net_device *netdev)
+{
+	struct qlcnic_adapter *adapter = netdev_priv(netdev);
+	struct netdev_hw_addr *ha;
+	struct qlcnic_mac_list_s *cur;
+
+	if (!test_bit(__QLCNIC_FW_ATTACHED, &adapter->state))
+		return;
+	if (qlcnic_sriov_vf_check(adapter)) {
+		if (!netdev_mc_empty(netdev)) {
+			netdev_for_each_mc_addr(ha, netdev) {
+				cur = kzalloc(sizeof(struct qlcnic_mac_list_s),
+					      GFP_ATOMIC);
+				memcpy(cur->mac_addr,
+				       ha->addr, ETH_ALEN);
+				list_add_tail(&cur->list, &adapter->vf_mc_list);
+			}
+		}
+		qlcnic_sriov_vf_schedule_multi(adapter->netdev);
+		return;
+	}
+	__qlcnic_set_multi(netdev);
+}
+
 int qlcnic_82xx_nic_set_promisc(struct qlcnic_adapter *adapter, u32 mode)
 {
 	struct qlcnic_nic_req req;

drivers/net/ethernet/qlogic/qlcnic/qlcnic_main.c

@@ -1425,6 +1425,8 @@ void __qlcnic_down(struct qlcnic_adapter *adapter, struct net_device *netdev)
 	if (!test_and_clear_bit(__QLCNIC_DEV_UP, &adapter->state))
 		return;
 
+	if (qlcnic_sriov_vf_check(adapter))
+		qlcnic_sriov_cleanup_async_list(&adapter->ahw->sriov->bc);
 	smp_mb();
 	spin_lock(&adapter->tx_clean_lock);
 	netif_carrier_off(netdev);

drivers/net/ethernet/qlogic/qlcnic/qlcnic_sriov.h

@@ -133,9 +133,17 @@ struct qlcnic_vf_info {
 	struct qlcnic_vport		*vp;
 };
 
+struct qlcnic_async_work_list {
+	struct list_head	list;
+	struct work_struct	work;
+	void			*ptr;
+};
+
 struct qlcnic_back_channel {
 	u16			trans_counter;
 	struct workqueue_struct *bc_trans_wq;
+	struct workqueue_struct *bc_async_wq;
+	struct list_head	async_list;
 };
 
 struct qlcnic_sriov {
@@ -156,6 +164,7 @@ int qlcnic_sriov_func_to_index(struct qlcnic_adapter *, u8);
 int qlcnic_sriov_channel_cfg_cmd(struct qlcnic_adapter *, u8);
 void qlcnic_sriov_handle_bc_event(struct qlcnic_adapter *, u32);
 int qlcnic_sriov_cfg_bc_intr(struct qlcnic_adapter *, u8);
+void qlcnic_sriov_cleanup_async_list(struct qlcnic_back_channel *);
 
 static inline bool qlcnic_sriov_enable_check(struct qlcnic_adapter *adapter)
 {

drivers/net/ethernet/qlogic/qlcnic/qlcnic_sriov_common.c

@@ -141,6 +141,16 @@ int qlcnic_sriov_init(struct qlcnic_adapter *adapter, int num_vfs)
 
 	bc->bc_trans_wq = wq;
 
+	wq = create_singlethread_workqueue("async");
+	if (wq == NULL) {
+		err = -ENOMEM;
+		dev_err(&adapter->pdev->dev, "Cannot create async workqueue\n");
+		goto qlcnic_destroy_trans_wq;
+	}
+
+	bc->bc_async_wq =  wq;
+	INIT_LIST_HEAD(&bc->async_list);
+
 	for (i = 0; i < num_vfs; i++) {
 		vf = &sriov->vf_info[i];
 		vf->adapter = adapter;
@@ -156,7 +166,7 @@ int qlcnic_sriov_init(struct qlcnic_adapter *adapter, int num_vfs)
 			vp = kzalloc(sizeof(struct qlcnic_vport), GFP_KERNEL);
 			if (!vp) {
 				err = -ENOMEM;
-				goto qlcnic_destroy_trans_wq;
+				goto qlcnic_destroy_async_wq;
 			}
 			sriov->vf_info[i].vp = vp;
 			random_ether_addr(vp->mac);
@@ -168,6 +178,9 @@ int qlcnic_sriov_init(struct qlcnic_adapter *adapter, int num_vfs)
 
 	return 0;
 
+qlcnic_destroy_async_wq:
+	destroy_workqueue(bc->bc_async_wq);
+
 qlcnic_destroy_trans_wq:
 	destroy_workqueue(bc->bc_trans_wq);
 
@@ -188,6 +201,8 @@ void __qlcnic_sriov_cleanup(struct qlcnic_adapter *adapter)
 	if (!qlcnic_sriov_enable_check(adapter))
 		return;
 
+	qlcnic_sriov_cleanup_async_list(bc);
+	destroy_workqueue(bc->bc_async_wq);
 	destroy_workqueue(bc->bc_trans_wq);
 
 	for (i = 0; i < sriov->num_vfs; i++)
@@ -351,6 +366,7 @@ static int qlcnic_sriov_setup_vf(struct qlcnic_adapter *adapter,
 {
 	int err;
 
+	INIT_LIST_HEAD(&adapter->vf_mc_list);
 	if (!qlcnic_use_msi_x && !!qlcnic_use_msi)
 		dev_warn(&adapter->pdev->dev,
 			 "83xx adapter do not support MSI interrupts\n");
@@ -1167,3 +1183,115 @@ out:
 	qlcnic_free_mbx_args(&cmd);
 	return ret;
 }
+
+void qlcnic_vf_add_mc_list(struct net_device *netdev)
+{
+	struct qlcnic_adapter *adapter = netdev_priv(netdev);
+	struct qlcnic_mac_list_s *cur;
+	struct list_head *head, tmp_list;
+
+	INIT_LIST_HEAD(&tmp_list);
+	head = &adapter->vf_mc_list;
+	netif_addr_lock_bh(netdev);
+
+	while (!list_empty(head)) {
+		cur = list_entry(head->next, struct qlcnic_mac_list_s, list);
+		list_move(&cur->list, &tmp_list);
+	}
+
+	netif_addr_unlock_bh(netdev);
+
+	while (!list_empty(&tmp_list)) {
+		cur = list_entry((&tmp_list)->next,
+				 struct qlcnic_mac_list_s, list);
+		qlcnic_nic_add_mac(adapter, cur->mac_addr);
+		list_del(&cur->list);
+		kfree(cur);
+	}
+}
+
+void qlcnic_sriov_cleanup_async_list(struct qlcnic_back_channel *bc)
+{
+	struct list_head *head = &bc->async_list;
+	struct qlcnic_async_work_list *entry;
+
+	while (!list_empty(head)) {
+		entry = list_entry(head->next, struct qlcnic_async_work_list,
+				   list);
+		cancel_work_sync(&entry->work);
+		list_del(&entry->list);
+		kfree(entry);
+	}
+}
+
+static void qlcnic_sriov_vf_set_multi(struct net_device *netdev)
+{
+	struct qlcnic_adapter *adapter = netdev_priv(netdev);
+
+	if (!test_bit(__QLCNIC_FW_ATTACHED, &adapter->state))
+		return;
+
+	__qlcnic_set_multi(netdev);
+}
+
+static void qlcnic_sriov_handle_async_multi(struct work_struct *work)
+{
+	struct qlcnic_async_work_list *entry;
+	struct net_device *netdev;
+
+	entry = container_of(work, struct qlcnic_async_work_list, work);
+	netdev = (struct net_device *)entry->ptr;
+
+	qlcnic_sriov_vf_set_multi(netdev);
+	return;
+}
+
+static struct qlcnic_async_work_list *
+qlcnic_sriov_get_free_node_async_work(struct qlcnic_back_channel *bc)
+{
+	struct list_head *node;
+	struct qlcnic_async_work_list *entry = NULL;
+	u8 empty = 0;
+
+	list_for_each(node, &bc->async_list) {
+		entry = list_entry(node, struct qlcnic_async_work_list, list);
+		if (!work_pending(&entry->work)) {
+			empty = 1;
+			break;
+		}
+	}
+
+	if (!empty) {
+		entry = kzalloc(sizeof(struct qlcnic_async_work_list),
+				GFP_ATOMIC);
+		if (entry == NULL)
+			return NULL;
+		list_add_tail(&entry->list, &bc->async_list);
+	}
+
+	return entry;
+}
+
+static void qlcnic_sriov_schedule_bc_async_work(struct qlcnic_back_channel *bc,
+						work_func_t func, void *data)
+{
+	struct qlcnic_async_work_list *entry = NULL;
+
+	entry = qlcnic_sriov_get_free_node_async_work(bc);
+	if (!entry)
+		return;
+
+	entry->ptr = data;
+	INIT_WORK(&entry->work, func);
+	queue_work(bc->bc_async_wq, &entry->work);
+}
+
+void qlcnic_sriov_vf_schedule_multi(struct net_device *netdev)
+{
+
+	struct qlcnic_adapter *adapter = netdev_priv(netdev);
+	struct qlcnic_back_channel *bc = &adapter->ahw->sriov->bc;
+
+	qlcnic_sriov_schedule_bc_async_work(bc, qlcnic_sriov_handle_async_multi,
+					    netdev);
+}