netxen: async link event handling

Add support for asynchronous events from firmware,
received over one of the rx rings.

Add support for event based phy interrupts, enhanced links
status reporting from firmware.
Signed-off-by: Dhananjay Phadke <dhananjay@netxen.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/netxen/netxen_nic.h

@@ -354,6 +354,7 @@ struct rcv_desc {
 /* opcode field in status_desc */
 #define NETXEN_NIC_RXPKT_DESC  0x04
 #define NETXEN_OLD_RXPKT_DESC  0x3f
+#define NETXEN_NIC_RESPONSE_DESC 0x05
 
 /* for status field in status_desc */
 #define STATUS_NEED_CKSUM	(1)
@@ -363,8 +364,11 @@ struct rcv_desc {
 #define STATUS_OWNER_HOST	(0x1ULL << 56)
 #define STATUS_OWNER_PHANTOM	(0x2ULL << 56)
 
-/* Note: sizeof(status_desc) should always be a mutliple of 2 */
-
+/* Status descriptor:
+   0-3 port, 4-7 status, 8-11 type, 12-27 total_length
+   28-43 reference_handle, 44-47 protocol, 48-52 pkt_offset
+   53-55 desc_cnt, 56-57 owner, 58-63 opcode
+ */
 #define netxen_get_sts_port(sts_data)	\
 	((sts_data) & 0x0F)
 #define netxen_get_sts_status(sts_data)	\
@@ -379,35 +383,13 @@ struct rcv_desc {
 	(((sts_data) >> 44) & 0x0F)
 #define netxen_get_sts_pkt_offset(sts_data)	\
 	(((sts_data) >> 48) & 0x1F)
+#define netxen_get_sts_desc_cnt(sts_data)	\
+	(((sts_data) >> 53) & 0x7)
 #define netxen_get_sts_opcode(sts_data)	\
 	(((sts_data) >> 58) & 0x03F)
 
 struct status_desc {
-	/* Bit pattern: 0-3 port, 4-7 status, 8-11 type, 12-27 total_length
-	   28-43 reference_handle, 44-47 protocol, 48-52 pkt_offset
-	   53-55 desc_cnt, 56-57 owner, 58-63 opcode
-	 */
-	__le64 status_desc_data;
-	union {
-		struct {
-			__le32 hash_value;
-			u8 hash_type;
-			u8 msg_type;
-			u8 unused;
-			union {
-				/* Bit pattern: 0-6 lro_count indicates frag
-				 * sequence, 7 last_frag indicates last frag
-				 */
-				u8 lro;
-
-				/* chained buffers */
-				u8 nr_frags;
-			};
-		};
-		struct {
-			__le16 frag_handles[4];
-		};
-	};
+	__le64 status_desc_data[2];
 } __attribute__ ((aligned(16)));
 
 /* The version of the main data structure */
@@ -1114,6 +1096,66 @@ typedef struct {
 #define VPORT_MISS_MODE_ACCEPT_ALL	1 /* accept all packets */
 #define VPORT_MISS_MODE_ACCEPT_MULTI	2 /* accept unmatched multicast */
 
+#define NX_FW_CAPABILITY_LINK_NOTIFICATION	(1 << 5)
+#define NX_FW_CAPABILITY_SWITCHING		(1 << 6)
+
+/* module types */
+#define LINKEVENT_MODULE_NOT_PRESENT			1
+#define LINKEVENT_MODULE_OPTICAL_UNKNOWN		2
+#define LINKEVENT_MODULE_OPTICAL_SRLR			3
+#define LINKEVENT_MODULE_OPTICAL_LRM			4
+#define LINKEVENT_MODULE_OPTICAL_SFP_1G			5
+#define LINKEVENT_MODULE_TWINAX_UNSUPPORTED_CABLE	6
+#define LINKEVENT_MODULE_TWINAX_UNSUPPORTED_CABLELEN	7
+#define LINKEVENT_MODULE_TWINAX				8
+
+#define LINKSPEED_10GBPS	10000
+#define LINKSPEED_1GBPS		1000
+#define LINKSPEED_100MBPS	100
+#define LINKSPEED_10MBPS	10
+
+#define LINKSPEED_ENCODED_10MBPS	0
+#define LINKSPEED_ENCODED_100MBPS	1
+#define LINKSPEED_ENCODED_1GBPS		2
+
+#define LINKEVENT_AUTONEG_DISABLED	0
+#define LINKEVENT_AUTONEG_ENABLED	1
+
+#define LINKEVENT_HALF_DUPLEX		0
+#define LINKEVENT_FULL_DUPLEX		1
+
+#define LINKEVENT_LINKSPEED_MBPS	0
+#define LINKEVENT_LINKSPEED_ENCODED	1
+
+/* firmware response header:
+ *	63:58 - message type
+ *	57:56 - owner
+ *	55:53 - desc count
+ *	52:48 - reserved
+ *	47:40 - completion id
+ *	39:32 - opcode
+ *	31:16 - error code
+ *	15:00 - reserved
+ */
+#define netxen_get_nic_msgtype(msg_hdr)	\
+	((msg_hdr >> 58) & 0x3F)
+#define netxen_get_nic_msg_compid(msg_hdr)	\
+	((msg_hdr >> 40) & 0xFF)
+#define netxen_get_nic_msg_opcode(msg_hdr)	\
+	((msg_hdr >> 32) & 0xFF)
+#define netxen_get_nic_msg_errcode(msg_hdr)	\
+	((msg_hdr >> 16) & 0xFFFF)
+
+typedef struct {
+	union {
+		struct {
+			u64 hdr;
+			u64 body[7];
+		};
+		u64 words[8];
+	};
+} nx_fw_msg_t;
+
 typedef struct {
 	__le64 qhdr;
 	__le64 req_hdr;
@@ -1177,15 +1219,21 @@ struct netxen_adapter {
 
 	u8 mc_enabled;
 	u8 max_mc_count;
+	u16 resv2;
+	u32 resv3;
+
+	u8 has_link_events;
+	u8 resv1;
 	u16 tx_context_id;
 	u16 mtu;
 	u16 is_up;
+
 	u16 link_speed;
 	u16 link_duplex;
 	u16 link_autoneg;
-	u16 resv1;
+	u16 module_type;
 
-	u32 resv2;
+	u32 capabilities;
 	u32 flags;
 	u32 irq;
 	u32 temp;
@@ -1398,6 +1446,8 @@ void netxen_p3_free_mac_list(struct netxen_adapter *adapter);
 int netxen_p3_nic_set_promisc(struct netxen_adapter *adapter, u32);
 int netxen_config_intr_coalesce(struct netxen_adapter *adapter);
 int netxen_config_rss(struct netxen_adapter *adapter, int enable);
+int netxen_linkevent_request(struct netxen_adapter *adapter, int enable);
+void netxen_advert_link_change(struct netxen_adapter *adapter, int linkup);
 
 int nx_fw_cmd_set_mtu(struct netxen_adapter *adapter, int mtu);
 int netxen_nic_change_mtu(struct net_device *netdev, int new_mtu);

drivers/net/netxen/netxen_nic_ethtool.c

@@ -110,6 +110,7 @@ static int
 netxen_nic_get_settings(struct net_device *dev, struct ethtool_cmd *ecmd)
 {
 	struct netxen_adapter *adapter = netdev_priv(dev);
+	int check_sfp_module = 0;
 
 	/* read which mode */
 	if (adapter->ahw.port_type == NETXEN_NIC_GBE) {
@@ -143,6 +144,13 @@ netxen_nic_get_settings(struct net_device *dev, struct ethtool_cmd *ecmd)
 			ecmd->advertising = ADVERTISED_10000baseT_Full;
 		}
 
+		if (netif_running(dev) && adapter->has_link_events) {
+			ecmd->speed = adapter->link_speed;
+			ecmd->autoneg = adapter->link_autoneg;
+			ecmd->duplex = adapter->link_duplex;
+			goto skip;
+		}
+
 		ecmd->port = PORT_TP;
 
 		if (NX_IS_REVISION_P3(adapter->ahw.revision_id)) {
@@ -160,6 +168,7 @@ netxen_nic_get_settings(struct net_device *dev, struct ethtool_cmd *ecmd)
 	} else
 		return -EIO;
 
+skip:
 	ecmd->phy_address = adapter->physical_port;
 	ecmd->transceiver = XCVR_EXTERNAL;
 
@@ -190,7 +199,7 @@ netxen_nic_get_settings(struct net_device *dev, struct ethtool_cmd *ecmd)
 	case NETXEN_BRDTYPE_P3_HMEZ:
 		ecmd->supported |= SUPPORTED_MII;
 		ecmd->advertising |= ADVERTISED_MII;
-		ecmd->port = PORT_FIBRE;
+		ecmd->port = PORT_MII;
 		ecmd->autoneg = AUTONEG_DISABLE;
 		break;
 	case NETXEN_BRDTYPE_P3_10G_SFP_PLUS:
@@ -198,6 +207,8 @@ netxen_nic_get_settings(struct net_device *dev, struct ethtool_cmd *ecmd)
 	case NETXEN_BRDTYPE_P3_10G_SFP_QT:
 		ecmd->advertising |= ADVERTISED_TP;
 		ecmd->supported |= SUPPORTED_TP;
+		check_sfp_module = netif_running(dev) &&
+			adapter->has_link_events;
 	case NETXEN_BRDTYPE_P2_SB31_10G:
 	case NETXEN_BRDTYPE_P3_10G_XFP:
 		ecmd->supported |= SUPPORTED_FIBRE;
@@ -212,6 +223,8 @@ netxen_nic_get_settings(struct net_device *dev, struct ethtool_cmd *ecmd)
 			ecmd->advertising |=
 				(ADVERTISED_FIBRE | ADVERTISED_TP);
 			ecmd->port = PORT_FIBRE;
+			check_sfp_module = netif_running(dev) &&
+				adapter->has_link_events;
 		} else {
 			ecmd->autoneg = AUTONEG_ENABLE;
 			ecmd->supported |= (SUPPORTED_TP |SUPPORTED_Autoneg);
@@ -226,6 +239,23 @@ netxen_nic_get_settings(struct net_device *dev, struct ethtool_cmd *ecmd)
 		return -EIO;
 	}
 
+	if (check_sfp_module) {
+		switch (adapter->module_type) {
+		case LINKEVENT_MODULE_OPTICAL_UNKNOWN:
+		case LINKEVENT_MODULE_OPTICAL_SRLR:
+		case LINKEVENT_MODULE_OPTICAL_LRM:
+		case LINKEVENT_MODULE_OPTICAL_SFP_1G:
+			ecmd->port = PORT_FIBRE;
+			break;
+		case LINKEVENT_MODULE_TWINAX_UNSUPPORTED_CABLE:
+		case LINKEVENT_MODULE_TWINAX_UNSUPPORTED_CABLELEN:
+		case LINKEVENT_MODULE_TWINAX:
+			ecmd->port = PORT_TP;
+		default:
+			ecmd->port = -1;
+		}
+	}
+
 	return 0;
 }
 

drivers/net/netxen/netxen_nic_hw.c

@@ -731,6 +731,28 @@ int netxen_config_rss(struct netxen_adapter *adapter, int enable)
 	return rv;
 }
 
+int netxen_linkevent_request(struct netxen_adapter *adapter, int enable)
+{
+	nx_nic_req_t req;
+	u64 word;
+	int rv;
+
+	memset(&req, 0, sizeof(nx_nic_req_t));
+	req.qhdr = cpu_to_le64(NX_HOST_REQUEST << 23);
+
+	word = NX_NIC_H2C_OPCODE_GET_LINKEVENT | ((u64)adapter->portnum << 16);
+	req.req_hdr = cpu_to_le64(word);
+	req.words[0] = cpu_to_le64(enable);
+
+	rv = netxen_send_cmd_descs(adapter, (struct cmd_desc_type0 *)&req, 1);
+	if (rv != 0) {
+		printk(KERN_ERR "%s: could not configure link notification\n",
+				adapter->netdev->name);
+	}
+
+	return rv;
+}
+
 /*
  * netxen_nic_change_mtu - Change the Maximum Transfer Unit
  * @returns 0 on success, negative on failure

drivers/net/netxen/netxen_nic_init.c

@@ -795,9 +795,81 @@ int netxen_init_firmware(struct netxen_adapter *adapter)
 	adapter->pci_write_normalize(adapter,
 			CRB_CMDPEG_STATE, PHAN_INITIALIZE_ACK);
 
+	if (adapter->fw_version >= NETXEN_VERSION_CODE(4, 0, 222)) {
+		adapter->capabilities = netxen_nic_reg_read(adapter,
+				CRB_FW_CAPABILITIES_1);
+	}
+
 	return err;
 }
 
+static void
+netxen_handle_linkevent(struct netxen_adapter *adapter, nx_fw_msg_t *msg)
+{
+	u32 cable_OUI;
+	u16 cable_len;
+	u16 link_speed;
+	u8  link_status, module, duplex, autoneg;
+	struct net_device *netdev = adapter->netdev;
+
+	adapter->has_link_events = 1;
+
+	cable_OUI = msg->body[1] & 0xffffffff;
+	cable_len = (msg->body[1] >> 32) & 0xffff;
+	link_speed = (msg->body[1] >> 48) & 0xffff;
+
+	link_status = msg->body[2] & 0xff;
+	duplex = (msg->body[2] >> 16) & 0xff;
+	autoneg = (msg->body[2] >> 24) & 0xff;
+
+	module = (msg->body[2] >> 8) & 0xff;
+	if (module == LINKEVENT_MODULE_TWINAX_UNSUPPORTED_CABLE) {
+		printk(KERN_INFO "%s: unsupported cable: OUI 0x%x, length %d\n",
+				netdev->name, cable_OUI, cable_len);
+	} else if (module == LINKEVENT_MODULE_TWINAX_UNSUPPORTED_CABLELEN) {
+		printk(KERN_INFO "%s: unsupported cable length %d\n",
+				netdev->name, cable_len);
+	}
+
+	netxen_advert_link_change(adapter, link_status);
+
+	/* update link parameters */
+	if (duplex == LINKEVENT_FULL_DUPLEX)
+		adapter->link_duplex = DUPLEX_FULL;
+	else
+		adapter->link_duplex = DUPLEX_HALF;
+	adapter->module_type = module;
+	adapter->link_autoneg = autoneg;
+	adapter->link_speed = link_speed;
+}
+
+static void
+netxen_handle_fw_message(int desc_cnt, int index,
+		struct nx_host_sds_ring *sds_ring)
+{
+	nx_fw_msg_t msg;
+	struct status_desc *desc;
+	int i = 0, opcode;
+
+	while (desc_cnt > 0 && i < 8) {
+		desc = &sds_ring->desc_head[index];
+		msg.words[i++] = le64_to_cpu(desc->status_desc_data[0]);
+		msg.words[i++] = le64_to_cpu(desc->status_desc_data[1]);
+
+		index = get_next_index(index, sds_ring->num_desc);
+		desc_cnt--;
+	}
+
+	opcode = netxen_get_nic_msg_opcode(msg.body[0]);
+	switch (opcode) {
+	case NX_NIC_C2H_OPCODE_GET_LINKEVENT_RESPONSE:
+		netxen_handle_linkevent(sds_ring->adapter, &msg);
+		break;
+	default:
+		break;
+	}
+}
+
 static int
 netxen_alloc_rx_skb(struct netxen_adapter *adapter,
 		struct nx_host_rds_ring *rds_ring,
@@ -916,21 +988,35 @@ netxen_process_rcv_ring(struct nx_host_sds_ring *sds_ring, int max)
 
 	int count = 0;
 	u64 sts_data;
-	int opcode, ring, index, length, cksum, pkt_offset;
+	int opcode, ring, index, length, cksum, pkt_offset, desc_cnt;
 
 	while (count < max) {
 		desc = &sds_ring->desc_head[consumer];
-		sts_data = le64_to_cpu(desc->status_desc_data);
+		sts_data = le64_to_cpu(desc->status_desc_data[0]);
 
 		if (!(sts_data & STATUS_OWNER_HOST))
 			break;
 
+		desc_cnt = netxen_get_sts_desc_cnt(sts_data);
 		ring   = netxen_get_sts_type(sts_data);
+
 		if (ring > RCV_RING_JUMBO)
-			continue;
+			goto skip;
 
 		opcode = netxen_get_sts_opcode(sts_data);
 
+		switch (opcode) {
+		case NETXEN_NIC_RXPKT_DESC:
+		case NETXEN_OLD_RXPKT_DESC:
+			break;
+		case NETXEN_NIC_RESPONSE_DESC:
+			netxen_handle_fw_message(desc_cnt, consumer, sds_ring);
+		default:
+			goto skip;
+		}
+
+		WARN_ON(desc_cnt > 1);
+
 		index  = netxen_get_sts_refhandle(sts_data);
 		length = netxen_get_sts_totallength(sts_data);
 		cksum  = netxen_get_sts_status(sts_data);
@@ -942,9 +1028,13 @@ netxen_process_rcv_ring(struct nx_host_sds_ring *sds_ring, int max)
 		if (rxbuf)
 			list_add_tail(&rxbuf->list, &sds_ring->free_list[ring]);
 
-		desc->status_desc_data = cpu_to_le64(STATUS_OWNER_PHANTOM);
-
-		consumer = get_next_index(consumer, sds_ring->num_desc);
+skip:
+		for (; desc_cnt > 0; desc_cnt--) {
+			desc = &sds_ring->desc_head[consumer];
+			desc->status_desc_data[0] =
+				cpu_to_le64(STATUS_OWNER_PHANTOM);
+			consumer = get_next_index(consumer, sds_ring->num_desc);
+		}
 		count++;
 	}
 

drivers/net/netxen/netxen_nic_main.c

@@ -787,6 +787,9 @@ netxen_nic_up(struct netxen_adapter *adapter, struct net_device *netdev)
 	if (adapter->max_sds_rings > 1)
 		netxen_config_rss(adapter, 1);
 
+	if (NX_IS_REVISION_P3(adapter->ahw.revision_id))
+		netxen_linkevent_request(adapter, 1);
+
 	return 0;
 }
 
@@ -1493,26 +1496,9 @@ static int netxen_nic_check_temp(struct netxen_adapter *adapter)
 	return rv;
 }
 
-static void netxen_nic_handle_phy_intr(struct netxen_adapter *adapter)
+void netxen_advert_link_change(struct netxen_adapter *adapter, int linkup)
 {
 	struct net_device *netdev = adapter->netdev;
-	u32 val, port, linkup;
-
-	port = adapter->physical_port;
-
-	if (NX_IS_REVISION_P3(adapter->ahw.revision_id)) {
-		val = adapter->pci_read_normalize(adapter, CRB_XG_STATE_P3);
-		val = XG_LINK_STATE_P3(adapter->ahw.pci_func, val);
-		linkup = (val == XG_LINK_UP_P3);
-	} else {
-		val = adapter->pci_read_normalize(adapter, CRB_XG_STATE);
-		if (adapter->ahw.port_type == NETXEN_NIC_GBE)
-			linkup = (val >> port) & 1;
-		else {
-			val = (val >> port*8) & 0xff;
-			linkup = (val == XG_LINK_UP);
-		}
-	}
 
 	if (adapter->ahw.linkup && !linkup) {
 		printk(KERN_INFO "%s: %s NIC Link is down\n",
@@ -1523,7 +1509,9 @@ static void netxen_nic_handle_phy_intr(struct netxen_adapter *adapter)
 			netif_stop_queue(netdev);
 		}
 
-		netxen_nic_set_link_parameters(adapter);
+		if (!adapter->has_link_events)
+			netxen_nic_set_link_parameters(adapter);
+
 	} else if (!adapter->ahw.linkup && linkup) {
 		printk(KERN_INFO "%s: %s NIC Link is up\n",
 		       netxen_nic_driver_name, netdev->name);
@@ -1533,10 +1521,34 @@ static void netxen_nic_handle_phy_intr(struct netxen_adapter *adapter)
 			netif_wake_queue(netdev);
 		}
 
-		netxen_nic_set_link_parameters(adapter);
+		if (!adapter->has_link_events)
+			netxen_nic_set_link_parameters(adapter);
 	}
 }
 
+static void netxen_nic_handle_phy_intr(struct netxen_adapter *adapter)
+{
+	u32 val, port, linkup;
+
+	port = adapter->physical_port;
+
+	if (NX_IS_REVISION_P3(adapter->ahw.revision_id)) {
+		val = adapter->pci_read_normalize(adapter, CRB_XG_STATE_P3);
+		val = XG_LINK_STATE_P3(adapter->ahw.pci_func, val);
+		linkup = (val == XG_LINK_UP_P3);
+	} else {
+		val = adapter->pci_read_normalize(adapter, CRB_XG_STATE);
+		if (adapter->ahw.port_type == NETXEN_NIC_GBE)
+			linkup = (val >> port) & 1;
+		else {
+			val = (val >> port*8) & 0xff;
+			linkup = (val == XG_LINK_UP);
+		}
+	}
+
+	netxen_advert_link_change(adapter, linkup);
+}
+
 static void netxen_watchdog(unsigned long v)
 {
 	struct netxen_adapter *adapter = (struct netxen_adapter *)v;
@@ -1552,7 +1564,8 @@ void netxen_watchdog_task(struct work_struct *work)
 	if ((adapter->portnum  == 0) && netxen_nic_check_temp(adapter))
 		return;
 
-	netxen_nic_handle_phy_intr(adapter);
+	if (!adapter->has_link_events)
+		netxen_nic_handle_phy_intr(adapter);
 
 	if (netif_running(adapter->netdev))
 		mod_timer(&adapter->watchdog_timer, jiffies + 2 * HZ);

drivers/net/netxen/netxen_nic_phan_reg.h

@@ -134,6 +134,7 @@
 #define CRB_NIC_CAPABILITIES_FW	  	NETXEN_NIC_REG(0x1dc)
 #define CRB_NIC_MSI_MODE_HOST		NETXEN_NIC_REG(0x270)
 #define CRB_NIC_MSI_MODE_FW	  	NETXEN_NIC_REG(0x274)
+#define CRB_FW_CAPABILITIES_1		NETXEN_NIC_REG(0x128)
 
 #define INTR_SCHEME_PERPORT	      	0x1
 #define MSI_MODE_MULTIFUNC	      	0x1