Merge branch 'thunderx-new-features'

Sunil Goutham says:

====================
net: thunderx: Support for 80xx, RED, PFC e.t.c

This patch series adds support for SLM modules present on 80xx
silicon, enables ramdom early discard, backpressure generation,
PFC and some ethtool changes to display supported link modes e.t.c.
====================
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

drivers/net/ethernet/cavium/thunder/nic.h

@@ -149,6 +149,12 @@ struct nicvf_rss_info {
 	u64 key[RSS_HASH_KEY_SIZE];
 } ____cacheline_aligned_in_smp;
 
+struct nicvf_pfc {
+	u8    autoneg;
+	u8    fc_rx;
+	u8    fc_tx;
+};
+
 enum rx_stats_reg_offset {
 	RX_OCTS = 0x0,
 	RX_UCAST = 0x1,
@@ -292,11 +298,13 @@ struct nicvf {
 	u8			node;
 	u8			cpi_alg;
 	bool			link_up;
+	u8			mac_type;
 	u8			duplex;
 	u32			speed;
 	bool			tns_mode;
 	bool			loopback_supported;
 	struct nicvf_rss_info	rss_info;
+	struct nicvf_pfc	pfc;
 	struct tasklet_struct	qs_err_task;
 	struct work_struct	reset_task;
 
@@ -357,6 +365,7 @@ struct nicvf {
 #define	NIC_MBOX_MSG_SNICVF_PTR		0x15	/* Send sqet nicvf ptr to PVF */
 #define	NIC_MBOX_MSG_LOOPBACK		0x16	/* Set interface in loopback */
 #define	NIC_MBOX_MSG_RESET_STAT_COUNTER 0x17	/* Reset statistics counters */
+#define	NIC_MBOX_MSG_PFC		0x18	/* Pause frame control */
 #define	NIC_MBOX_MSG_CFG_DONE		0xF0	/* VF configuration done */
 #define	NIC_MBOX_MSG_SHUTDOWN		0xF1	/* VF is being shutdown */
 
@@ -446,6 +455,7 @@ struct bgx_stats_msg {
 /* Physical interface link status */
 struct bgx_link_status {
 	u8    msg;
+	u8    mac_type;
 	u8    link_up;
 	u8    duplex;
 	u32   speed;
@@ -498,6 +508,14 @@ struct reset_stat_cfg {
 	u16   sq_stat_mask;
 };
 
+struct pfc {
+	u8    msg;
+	u8    get; /* Get or set PFC settings */
+	u8    autoneg;
+	u8    fc_rx;
+	u8    fc_tx;
+};
+
 /* 128 bit shared memory between PF and each VF */
 union nic_mbx {
 	struct { u8 msg; }	msg;
@@ -516,6 +534,7 @@ union nic_mbx {
 	struct nicvf_ptr	nicvf;
 	struct set_loopback	lbk;
 	struct reset_stat_cfg	reset_stat;
+	struct pfc		pfc;
 };
 
 #define NIC_NODE_ID_MASK	0x03

drivers/net/ethernet/cavium/thunder/nic_main.c

@@ -809,6 +809,15 @@ static int nic_config_loopback(struct nicpf *nic, struct set_loopback *lbk)
 
 	bgx_lmac_internal_loopback(nic->node, bgx_idx, lmac_idx, lbk->enable);
 
+	/* Enable moving average calculation.
+	 * Keep the LVL/AVG delay to HW enforced minimum so that, not too many
+	 * packets sneek in between average calculations.
+	 */
+	nic_reg_write(nic, NIC_PF_CQ_AVG_CFG,
+		      (BIT_ULL(20) | 0x2ull << 14 | 0x1));
+	nic_reg_write(nic, NIC_PF_RRM_AVG_CFG,
+		      (BIT_ULL(20) | 0x3ull << 14 | 0x1));
+
 	return 0;
 }
 
@@ -889,6 +898,30 @@ static void nic_enable_vf(struct nicpf *nic, int vf, bool enable)
 	bgx_lmac_rx_tx_enable(nic->node, bgx, lmac, enable);
 }
 
+static void nic_pause_frame(struct nicpf *nic, int vf, struct pfc *cfg)
+{
+	int bgx, lmac;
+	struct pfc pfc;
+	union nic_mbx mbx = {};
+
+	if (vf >= nic->num_vf_en)
+		return;
+	bgx = NIC_GET_BGX_FROM_VF_LMAC_MAP(nic->vf_lmac_map[vf]);
+	lmac = NIC_GET_LMAC_FROM_VF_LMAC_MAP(nic->vf_lmac_map[vf]);
+
+	if (cfg->get) {
+		bgx_lmac_get_pfc(nic->node, bgx, lmac, &pfc);
+		mbx.pfc.msg = NIC_MBOX_MSG_PFC;
+		mbx.pfc.autoneg = pfc.autoneg;
+		mbx.pfc.fc_rx = pfc.fc_rx;
+		mbx.pfc.fc_tx = pfc.fc_tx;
+		nic_send_msg_to_vf(nic, vf, &mbx);
+	} else {
+		bgx_lmac_set_pfc(nic->node, bgx, lmac, cfg);
+		nic_mbx_send_ack(nic, vf);
+	}
+}
+
 /* Interrupt handler to handle mailbox messages from VFs */
 static void nic_handle_mbx_intr(struct nicpf *nic, int vf)
 {
@@ -1028,6 +1061,9 @@ static void nic_handle_mbx_intr(struct nicpf *nic, int vf)
 	case NIC_MBOX_MSG_RESET_STAT_COUNTER:
 		ret = nic_reset_stat_counters(nic, vf, &mbx.reset_stat);
 		break;
+	case NIC_MBOX_MSG_PFC:
+		nic_pause_frame(nic, vf, &mbx.pfc);
+		goto unlock;
 	default:
 		dev_err(&nic->pdev->dev,
 			"Invalid msg from VF%d, msg 0x%x\n", vf, mbx.msg.msg);
@@ -1258,6 +1294,7 @@ static void nic_poll_for_link(struct work_struct *work)
 			mbx.link_status.link_up = link.link_up;
 			mbx.link_status.duplex = link.duplex;
 			mbx.link_status.speed = link.speed;
+			mbx.link_status.mac_type = link.mac_type;
 			nic_send_msg_to_vf(nic, vf, &mbx);
 		}
 	}

drivers/net/ethernet/cavium/thunder/nicvf_ethtool.c

@@ -130,12 +130,42 @@ static int nicvf_get_settings(struct net_device *netdev,
 		return 0;
 	}
 
-	if (nic->speed <= 1000) {
-		cmd->port = PORT_MII;
+	switch (nic->speed) {
+	case SPEED_1000:
+		cmd->port = PORT_MII | PORT_TP;
 		cmd->autoneg = AUTONEG_ENABLE;
-	} else {
+		cmd->supported |= SUPPORTED_MII | SUPPORTED_TP;
+		cmd->supported |= SUPPORTED_1000baseT_Full |
+				  SUPPORTED_1000baseT_Half |
+				  SUPPORTED_100baseT_Full  |
+				  SUPPORTED_100baseT_Half  |
+				  SUPPORTED_10baseT_Full   |
+				  SUPPORTED_10baseT_Half;
+		cmd->supported |= SUPPORTED_Autoneg;
+		cmd->advertising |= ADVERTISED_1000baseT_Full |
+				    ADVERTISED_1000baseT_Half |
+				    ADVERTISED_100baseT_Full  |
+				    ADVERTISED_100baseT_Half  |
+				    ADVERTISED_10baseT_Full   |
+				    ADVERTISED_10baseT_Half;
+		break;
+	case SPEED_10000:
+		if (nic->mac_type == BGX_MODE_RXAUI) {
+			cmd->port = PORT_TP;
+			cmd->supported |= SUPPORTED_TP;
+		} else {
+			cmd->port = PORT_FIBRE;
+			cmd->supported |= SUPPORTED_FIBRE;
+		}
+		cmd->autoneg = AUTONEG_DISABLE;
+		cmd->supported |= SUPPORTED_10000baseT_Full;
+		break;
+	case SPEED_40000:
 		cmd->port = PORT_FIBRE;
 		cmd->autoneg = AUTONEG_DISABLE;
+		cmd->supported |= SUPPORTED_FIBRE;
+		cmd->supported |= SUPPORTED_40000baseCR4_Full;
+		break;
 	}
 	cmd->duplex = nic->duplex;
 	ethtool_cmd_speed_set(cmd, nic->speed);
@@ -690,6 +720,55 @@ static int nicvf_set_channels(struct net_device *dev,
 	return err;
 }
 
+static void nicvf_get_pauseparam(struct net_device *dev,
+				 struct ethtool_pauseparam *pause)
+{
+	struct nicvf *nic = netdev_priv(dev);
+	union nic_mbx mbx = {};
+
+	/* Supported only for 10G/40G interfaces */
+	if ((nic->mac_type == BGX_MODE_SGMII) ||
+	    (nic->mac_type == BGX_MODE_QSGMII) ||
+	    (nic->mac_type == BGX_MODE_RGMII))
+		return;
+
+	mbx.pfc.msg = NIC_MBOX_MSG_PFC;
+	mbx.pfc.get = 1;
+	if (!nicvf_send_msg_to_pf(nic, &mbx)) {
+		pause->autoneg = nic->pfc.autoneg;
+		pause->rx_pause = nic->pfc.fc_rx;
+		pause->tx_pause = nic->pfc.fc_tx;
+	}
+}
+
+static int nicvf_set_pauseparam(struct net_device *dev,
+				struct ethtool_pauseparam *pause)
+{
+	struct nicvf *nic = netdev_priv(dev);
+	union nic_mbx mbx = {};
+
+	/* Supported only for 10G/40G interfaces */
+	if ((nic->mac_type == BGX_MODE_SGMII) ||
+	    (nic->mac_type == BGX_MODE_QSGMII) ||
+	    (nic->mac_type == BGX_MODE_RGMII))
+		return -EOPNOTSUPP;
+
+	if (pause->autoneg)
+		return -EOPNOTSUPP;
+
+	mbx.pfc.msg = NIC_MBOX_MSG_PFC;
+	mbx.pfc.get = 0;
+	mbx.pfc.fc_rx = pause->rx_pause;
+	mbx.pfc.fc_tx = pause->tx_pause;
+	if (nicvf_send_msg_to_pf(nic, &mbx))
+		return -EAGAIN;
+
+	nic->pfc.fc_rx = pause->rx_pause;
+	nic->pfc.fc_tx = pause->tx_pause;
+
+	return 0;
+}
+
 static const struct ethtool_ops nicvf_ethtool_ops = {
 	.get_settings		= nicvf_get_settings,
 	.get_link		= nicvf_get_link,
@@ -711,6 +790,8 @@ static const struct ethtool_ops nicvf_ethtool_ops = {
 	.set_rxfh		= nicvf_set_rxfh,
 	.get_channels		= nicvf_get_channels,
 	.set_channels		= nicvf_set_channels,
+	.get_pauseparam         = nicvf_get_pauseparam,
+	.set_pauseparam         = nicvf_set_pauseparam,
 	.get_ts_info		= ethtool_op_get_ts_info,
 };
 

drivers/net/ethernet/cavium/thunder/nicvf_main.c

@@ -221,6 +221,7 @@ static void  nicvf_handle_mbx_intr(struct nicvf *nic)
 		nic->link_up = mbx.link_status.link_up;
 		nic->duplex = mbx.link_status.duplex;
 		nic->speed = mbx.link_status.speed;
+		nic->mac_type = mbx.link_status.mac_type;
 		if (nic->link_up) {
 			netdev_info(nic->netdev, "%s: Link is Up %d Mbps %s\n",
 				    nic->netdev->name, nic->speed,
@@ -255,6 +256,12 @@ static void  nicvf_handle_mbx_intr(struct nicvf *nic)
 		nic->pnicvf = (struct nicvf *)mbx.nicvf.nicvf;
 		nic->pf_acked = true;
 		break;
+	case NIC_MBOX_MSG_PFC:
+		nic->pfc.autoneg = mbx.pfc.autoneg;
+		nic->pfc.fc_rx = mbx.pfc.fc_rx;
+		nic->pfc.fc_tx = mbx.pfc.fc_tx;
+		nic->pf_acked = true;
+		break;
 	default:
 		netdev_err(nic->netdev,
 			   "Invalid message from PF, msg 0x%x\n", mbx.msg.msg);

drivers/net/ethernet/cavium/thunder/nicvf_queues.c

@@ -544,14 +544,18 @@ static void nicvf_rcv_queue_config(struct nicvf *nic, struct queue_set *qs,
 	nicvf_send_msg_to_pf(nic, &mbx);
 
 	mbx.rq.msg = NIC_MBOX_MSG_RQ_BP_CFG;
-	mbx.rq.cfg = (1ULL << 63) | (1ULL << 62) | (qs->vnic_id << 0);
+	mbx.rq.cfg = BIT_ULL(63) | BIT_ULL(62) |
+		     (RQ_PASS_RBDR_LVL << 16) | (RQ_PASS_CQ_LVL << 8) |
+		     (qs->vnic_id << 0);
 	nicvf_send_msg_to_pf(nic, &mbx);
 
 	/* RQ drop config
 	 * Enable CQ drop to reserve sufficient CQEs for all tx packets
 	 */
 	mbx.rq.msg = NIC_MBOX_MSG_RQ_DROP_CFG;
-	mbx.rq.cfg = (1ULL << 62) | (RQ_CQ_DROP << 8);
+	mbx.rq.cfg = BIT_ULL(63) | BIT_ULL(62) |
+		     (RQ_PASS_RBDR_LVL << 40) | (RQ_DROP_RBDR_LVL << 32) |
+		     (RQ_PASS_CQ_LVL << 16) | (RQ_DROP_CQ_LVL << 8);
 	nicvf_send_msg_to_pf(nic, &mbx);
 
 	if (!nic->sqs_mode && (qidx == 0)) {
@@ -650,6 +654,7 @@ static void nicvf_snd_queue_config(struct nicvf *nic, struct queue_set *qs,
 	sq_cfg.ldwb = 0;
 	sq_cfg.qsize = SND_QSIZE;
 	sq_cfg.tstmp_bgx_intf = 0;
+	sq_cfg.cq_limit = 0;
 	nicvf_queue_reg_write(nic, NIC_QSET_SQ_0_7_CFG, qidx, *(u64 *)&sq_cfg);
 
 	/* Set threshold value for interrupt generation */

drivers/net/ethernet/cavium/thunder/nicvf_queues.h

@@ -85,12 +85,26 @@
 
 #define MAX_CQES_FOR_TX		((SND_QUEUE_LEN / MIN_SQ_DESC_PER_PKT_XMIT) * \
 				 MAX_CQE_PER_PKT_XMIT)
-/* Calculate number of CQEs to reserve for all SQEs.
- * Its 1/256th level of CQ size.
- * '+ 1' to account for pipelining
+
+/* RED and Backpressure levels of CQ for pkt reception
+ * For CQ, level is a measure of emptiness i.e 0x0 means full
+ * eg: For CQ of size 4K, and for pass/drop levels of 128/96
+ * HW accepts pkt if unused CQE >= 2048
+ * RED accepts pkt if unused CQE < 2048 & >= 1536
+ * DROPs pkts if unused CQE < 1536
+ */
+#define RQ_PASS_CQ_LVL		128ULL
+#define RQ_DROP_CQ_LVL		96ULL
+
+/* RED and Backpressure levels of RBDR for pkt reception
+ * For RBDR, level is a measure of fullness i.e 0x0 means empty
+ * eg: For RBDR of size 8K, and for pass/drop levels of 4/0
+ * HW accepts pkt if unused RBs >= 256
+ * RED accepts pkt if unused RBs < 256 & >= 0
+ * DROPs pkts if unused RBs < 0
  */
-#define RQ_CQ_DROP		((256 / (CMP_QUEUE_LEN / \
-				 (CMP_QUEUE_LEN - MAX_CQES_FOR_TX))) + 1)
+#define RQ_PASS_RBDR_LVL	8ULL
+#define RQ_DROP_RBDR_LVL	0ULL
 
 /* Descriptor size in bytes */
 #define SND_QUEUE_DESC_SIZE	16

drivers/net/ethernet/cavium/thunder/q_struct.h

@@ -624,7 +624,9 @@ struct cq_cfg {
 
 struct sq_cfg {
 #if defined(__BIG_ENDIAN_BITFIELD)
-	u64 reserved_20_63:44;
+	u64 reserved_32_63:32;
+	u64 cq_limit:8;
+	u64 reserved_20_23:4;
 	u64 ena:1;
 	u64 reserved_18_18:1;
 	u64 reset:1;
@@ -642,7 +644,9 @@ struct sq_cfg {
 	u64 reset:1;
 	u64 reserved_18_18:1;
 	u64 ena:1;
-	u64 reserved_20_63:44;
+	u64 reserved_20_23:4;
+	u64 cq_limit:8;
+	u64 reserved_32_63:32;
 #endif
 };
 

drivers/net/ethernet/cavium/thunder/thunder_bgx.c

@@ -161,6 +161,7 @@ void bgx_get_lmac_link_state(int node, int bgx_idx, int lmacid, void *status)
 		return;
 
 	lmac = &bgx->lmac[lmacid];
+	link->mac_type = lmac->lmac_type;
 	link->link_up = lmac->link_up;
 	link->duplex = lmac->last_duplex;
 	link->speed = lmac->last_speed;
@@ -211,6 +212,47 @@ void bgx_lmac_rx_tx_enable(int node, int bgx_idx, int lmacid, bool enable)
 }
 EXPORT_SYMBOL(bgx_lmac_rx_tx_enable);
 
+void bgx_lmac_get_pfc(int node, int bgx_idx, int lmacid, void *pause)
+{
+	struct pfc *pfc = (struct pfc *)pause;
+	struct bgx *bgx = bgx_vnic[(node * MAX_BGX_PER_CN88XX) + bgx_idx];
+	struct lmac *lmac;
+	u64 cfg;
+
+	if (!bgx)
+		return;
+	lmac = &bgx->lmac[lmacid];
+	if (lmac->is_sgmii)
+		return;
+
+	cfg = bgx_reg_read(bgx, lmacid, BGX_SMUX_CBFC_CTL);
+	pfc->fc_rx = cfg & RX_EN;
+	pfc->fc_tx = cfg & TX_EN;
+	pfc->autoneg = 0;
+}
+EXPORT_SYMBOL(bgx_lmac_get_pfc);
+
+void bgx_lmac_set_pfc(int node, int bgx_idx, int lmacid, void *pause)
+{
+	struct pfc *pfc = (struct pfc *)pause;
+	struct bgx *bgx = bgx_vnic[(node * MAX_BGX_PER_CN88XX) + bgx_idx];
+	struct lmac *lmac;
+	u64 cfg;
+
+	if (!bgx)
+		return;
+	lmac = &bgx->lmac[lmacid];
+	if (lmac->is_sgmii)
+		return;
+
+	cfg = bgx_reg_read(bgx, lmacid, BGX_SMUX_CBFC_CTL);
+	cfg &= ~(RX_EN | TX_EN);
+	cfg |= (pfc->fc_rx ? RX_EN : 0x00);
+	cfg |= (pfc->fc_tx ? TX_EN : 0x00);
+	bgx_reg_write(bgx, lmacid, BGX_SMUX_CBFC_CTL, cfg);
+}
+EXPORT_SYMBOL(bgx_lmac_set_pfc);
+
 static void bgx_sgmii_change_link_state(struct lmac *lmac)
 {
 	struct bgx *bgx = lmac->bgx;
@@ -524,6 +566,18 @@ static int bgx_lmac_xaui_init(struct bgx *bgx, struct lmac *lmac)
 	cfg |= SMU_TX_CTL_DIC_EN;
 	bgx_reg_write(bgx, lmacid, BGX_SMUX_TX_CTL, cfg);
 
+	/* Enable receive and transmission of pause frames */
+	bgx_reg_write(bgx, lmacid, BGX_SMUX_CBFC_CTL, ((0xffffULL << 32) |
+		      BCK_EN | DRP_EN | TX_EN | RX_EN));
+	/* Configure pause time and interval */
+	bgx_reg_write(bgx, lmacid,
+		      BGX_SMUX_TX_PAUSE_PKT_TIME, DEFAULT_PAUSE_TIME);
+	cfg = bgx_reg_read(bgx, lmacid, BGX_SMUX_TX_PAUSE_PKT_INTERVAL);
+	cfg &= ~0xFFFFull;
+	bgx_reg_write(bgx, lmacid, BGX_SMUX_TX_PAUSE_PKT_INTERVAL,
+		      cfg | (DEFAULT_PAUSE_TIME - 0x1000));
+	bgx_reg_write(bgx, lmacid, BGX_SMUX_TX_PAUSE_ZERO, 0x01);
+
 	/* take lmac_count into account */
 	bgx_reg_modify(bgx, lmacid, BGX_SMUX_TX_THRESH, (0x100 - 1));
 	/* max packet size */
@@ -970,11 +1024,25 @@ static void bgx_set_lmac_config(struct bgx *bgx, u8 idx)
 		lmac_set_training(bgx, lmac, lmac->lmacid);
 		lmac_set_lane2sds(bgx, lmac);
 
-		/* Set LMAC type of other lmac on same DLM i.e LMAC 1/3 */
 		olmac = &bgx->lmac[idx + 1];
-		olmac->lmac_type = lmac->lmac_type;
+		/*  Check if other LMAC on the same DLM is already configured by
+		 *  firmware, if so use the same config or else set as same, as
+		 *  that of LMAC 0/2.
+		 *  This check is needed as on 80xx only one lane of each of the
+		 *  DLM of BGX0 is used, so have to rely on firmware for
+		 *  distingushing 80xx from 81xx.
+		 */
+		cmr_cfg = bgx_reg_read(bgx, idx + 1, BGX_CMRX_CFG);
+		lmac_type = (u8)((cmr_cfg >> 8) & 0x07);
+		lane_to_sds = (u8)(cmr_cfg & 0xFF);
+		if ((lmac_type == 0) && (lane_to_sds == 0xE4)) {
+			olmac->lmac_type = lmac->lmac_type;
+			lmac_set_lane2sds(bgx, olmac);
+		} else {
+			olmac->lmac_type = lmac_type;
+			olmac->lane_to_sds = lane_to_sds;
+		}
 		lmac_set_training(bgx, olmac, olmac->lmacid);
-		lmac_set_lane2sds(bgx, olmac);
 	}
 }
 

drivers/net/ethernet/cavium/thunder/thunder_bgx.h

@@ -27,6 +27,7 @@
 #define    MAX_BGX_CHANS_PER_LMAC		16
 #define    MAX_DMAC_PER_LMAC			8
 #define    MAX_FRAME_SIZE			9216
+#define    DEFAULT_PAUSE_TIME			0xFFFF
 
 #define	   BGX_ID_MASK				0x3
 
@@ -126,7 +127,10 @@
 #define  SMU_RX_CTL_STATUS			(3ull << 0)
 #define BGX_SMUX_TX_APPEND		0x20100
 #define  SMU_TX_APPEND_FCS_D			BIT_ULL(2)
+#define BGX_SMUX_TX_PAUSE_PKT_TIME	0x20110
 #define BGX_SMUX_TX_MIN_PKT		0x20118
+#define BGX_SMUX_TX_PAUSE_PKT_INTERVAL	0x20120
+#define BGX_SMUX_TX_PAUSE_ZERO		0x20138
 #define BGX_SMUX_TX_INT			0x20140
 #define BGX_SMUX_TX_CTL			0x20178
 #define  SMU_TX_CTL_DIC_EN			BIT_ULL(0)
@@ -136,6 +140,11 @@
 #define BGX_SMUX_CTL			0x20200
 #define  SMU_CTL_RX_IDLE			BIT_ULL(0)
 #define  SMU_CTL_TX_IDLE			BIT_ULL(1)
+#define	BGX_SMUX_CBFC_CTL		0x20218
+#define	RX_EN					BIT_ULL(0)
+#define	TX_EN					BIT_ULL(1)
+#define	BCK_EN					BIT_ULL(2)
+#define	DRP_EN					BIT_ULL(3)
 
 #define BGX_GMP_PCS_MRX_CTL		0x30000
 #define	 PCS_MRX_CTL_RST_AN			BIT_ULL(9)
@@ -207,6 +216,9 @@ void bgx_set_lmac_mac(int node, int bgx_idx, int lmacid, const u8 *mac);
 void bgx_get_lmac_link_state(int node, int bgx_idx, int lmacid, void *status);
 void bgx_lmac_internal_loopback(int node, int bgx_idx,
 				int lmac_idx, bool enable);
+void bgx_lmac_get_pfc(int node, int bgx_idx, int lmacid, void *pause);
+void bgx_lmac_set_pfc(int node, int bgx_idx, int lmacid, void *pause);
+
 void xcv_init_hw(void);
 void xcv_setup_link(bool link_up, int link_speed);