qed/qede: Multi CoS support.

This patch adds support for tc mqprio offload,
using this different traffic classes on the adapter
can be utilized based on configured priority to tc map.

For example -

tc qdisc add dev eth0 root mqprio num_tc 4 map 0 1 2 3

This will cause SKBs with priority 0,1,2,3 to transmit
over tc 0,1,2,3 hardware queues respectively.

Signed-off-by: Manish Chopra <manish.chopra@cavium.com>
Signed-off-by: Ariel Elior <ariel.elior@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 114 insertions, 25 deletions

diff --git a/drivers/net/ethernet/qlogic/qede/qede_main.c b/drivers/net/ethernet/qlogic/qede/qede_main.c
index 6a796040a32c..d7299afa902c 100644
--- a/drivers/net/ethernet/qlogic/qede/qede_main.c
+++ b/drivers/net/ethernet/qlogic/qede/qede_main.c
@@ -536,6 +536,43 @@ static int qede_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 	return 0;
 }
 
+int qede_setup_tc(struct net_device *ndev, u8 num_tc)
+{
+	struct qede_dev *edev = netdev_priv(ndev);
+	int cos, count, offset;
+
+	if (num_tc > edev->dev_info.num_tc)
+		return -EINVAL;
+
+	netdev_reset_tc(ndev);
+	netdev_set_num_tc(ndev, num_tc);
+
+	for_each_cos_in_txq(edev, cos) {
+		count = QEDE_TSS_COUNT(edev);
+		offset = cos * QEDE_TSS_COUNT(edev);
+		netdev_set_tc_queue(ndev, cos, count, offset);
+	}
+
+	return 0;
+}
+
+static int
+qede_setup_tc_offload(struct net_device *dev, enum tc_setup_type type,
+		      void *type_data)
+{
+	struct tc_mqprio_qopt *mqprio;
+
+	switch (type) {
+	case TC_SETUP_QDISC_MQPRIO:
+		mqprio = type_data;
+
+		mqprio->hw = TC_MQPRIO_HW_OFFLOAD_TCS;
+		return qede_setup_tc(dev, mqprio->num_tc);
+	default:
+		return -EOPNOTSUPP;
+	}
+}
+
 static const struct net_device_ops qede_netdev_ops = {
 	.ndo_open = qede_open,
 	.ndo_stop = qede_close,
@@ -568,6 +605,7 @@ static const struct net_device_ops qede_netdev_ops = {
 #ifdef CONFIG_RFS_ACCEL
 	.ndo_rx_flow_steer = qede_rx_flow_steer,
 #endif
+	.ndo_setup_tc = qede_setup_tc_offload,
 };
 
 static const struct net_device_ops qede_netdev_vf_ops = {
@@ -621,7 +659,8 @@ static struct qede_dev *qede_alloc_etherdev(struct qed_dev *cdev,
 	struct qede_dev *edev;
 
 	ndev = alloc_etherdev_mqs(sizeof(*edev),
-				  info->num_queues, info->num_queues);
+				  info->num_queues * info->num_tc,
+				  info->num_queues);
 	if (!ndev) {
 		pr_err("etherdev allocation failed\n");
 		return NULL;
@@ -830,7 +869,8 @@ static int qede_alloc_fp_array(struct qede_dev *edev)
 		}
 
 		if (fp->type & QEDE_FASTPATH_TX) {
-			fp->txq = kzalloc(sizeof(*fp->txq), GFP_KERNEL);
+			fp->txq = kcalloc(edev->dev_info.num_tc,
+					  sizeof(*fp->txq), GFP_KERNEL);
 			if (!fp->txq)
 				goto err;
 		}
@@ -879,10 +919,15 @@ static void qede_sp_task(struct work_struct *work)
 static void qede_update_pf_params(struct qed_dev *cdev)
 {
 	struct qed_pf_params pf_params;
+	u16 num_cons;
 
 	/* 64 rx + 64 tx + 64 XDP */
 	memset(&pf_params, 0, sizeof(struct qed_pf_params));
-	pf_params.eth_pf_params.num_cons = (MAX_SB_PER_PF_MIMD - 1) * 3;
+
+	/* 1 rx + 1 xdp + max tx cos */
+	num_cons = QED_MIN_L2_CONS;
+
+	pf_params.eth_pf_params.num_cons = (MAX_SB_PER_PF_MIMD - 1) * num_cons;
 
 	/* Same for VFs - make sure they'll have sufficient connections
 	 * to support XDP Tx queues.
@@ -1363,8 +1408,12 @@ static void qede_free_mem_fp(struct qede_dev *edev, struct qede_fastpath *fp)
 	if (fp->type & QEDE_FASTPATH_XDP)
 		qede_free_mem_txq(edev, fp->xdp_tx);
 
-	if (fp->type & QEDE_FASTPATH_TX)
-		qede_free_mem_txq(edev, fp->txq);
+	if (fp->type & QEDE_FASTPATH_TX) {
+		int cos;
+
+		for_each_cos_in_txq(edev, cos)
+			qede_free_mem_txq(edev, &fp->txq[cos]);
+	}
 }
 
 /* This function allocates all memory needed for a single fp (i.e. an entity
@@ -1391,9 +1440,13 @@ static int qede_alloc_mem_fp(struct qede_dev *edev, struct qede_fastpath *fp)
 	}
 
 	if (fp->type & QEDE_FASTPATH_TX) {
-		rc = qede_alloc_mem_txq(edev, fp->txq);
-		if (rc)
-			goto out;
+		int cos;
+
+		for_each_cos_in_txq(edev, cos) {
+			rc = qede_alloc_mem_txq(edev, &fp->txq[cos]);
+			if (rc)
+				goto out;
+		}
 	}
 
 out:
@@ -1466,10 +1519,23 @@ static void qede_init_fp(struct qede_dev *edev)
 		}
 
 		if (fp->type & QEDE_FASTPATH_TX) {
-			fp->txq->index = txq_index++;
-			if (edev->dev_info.is_legacy)
-				fp->txq->is_legacy = 1;
-			fp->txq->dev = &edev->pdev->dev;
+			int cos;
+
+			for_each_cos_in_txq(edev, cos) {
+				struct qede_tx_queue *txq = &fp->txq[cos];
+				u16 ndev_tx_id;
+
+				txq->cos = cos;
+				txq->index = txq_index;
+				ndev_tx_id = QEDE_TXQ_TO_NDEV_TXQ_ID(edev, txq);
+				txq->ndev_txq_id = ndev_tx_id;
+
+				if (edev->dev_info.is_legacy)
+					txq->is_legacy = 1;
+				txq->dev = &edev->pdev->dev;
+			}
+
+			txq_index++;
 		}
 
 		snprintf(fp->name, sizeof(fp->name), "%s-fp-%d",
@@ -1483,7 +1549,9 @@ static int qede_set_real_num_queues(struct qede_dev *edev)
 {
 	int rc = 0;
 
-	rc = netif_set_real_num_tx_queues(edev->ndev, QEDE_TSS_COUNT(edev));
+	rc = netif_set_real_num_tx_queues(edev->ndev,
+					  QEDE_TSS_COUNT(edev) *
+					  edev->dev_info.num_tc);
 	if (rc) {
 		DP_NOTICE(edev, "Failed to set real number of Tx queues\n");
 		return rc;
@@ -1685,9 +1753,13 @@ static int qede_stop_queues(struct qede_dev *edev)
 		fp = &edev->fp_array[i];
 
 		if (fp->type & QEDE_FASTPATH_TX) {
-			rc = qede_drain_txq(edev, fp->txq, true);
-			if (rc)
-				return rc;
+			int cos;
+
+			for_each_cos_in_txq(edev, cos) {
+				rc = qede_drain_txq(edev, &fp->txq[cos], true);
+				if (rc)
+					return rc;
+			}
 		}
 
 		if (fp->type & QEDE_FASTPATH_XDP) {
@@ -1703,9 +1775,13 @@ static int qede_stop_queues(struct qede_dev *edev)
 
 		/* Stop the Tx Queue(s) */
 		if (fp->type & QEDE_FASTPATH_TX) {
-			rc = qede_stop_txq(edev, fp->txq, i);
-			if (rc)
-				return rc;
+			int cos;
+
+			for_each_cos_in_txq(edev, cos) {
+				rc = qede_stop_txq(edev, &fp->txq[cos], i);
+				if (rc)
+					return rc;
+			}
 		}
 
 		/* Stop the Rx Queue */
@@ -1758,6 +1834,7 @@ static int qede_start_txq(struct qede_dev *edev,
 
 	params.p_sb = fp->sb_info;
 	params.sb_idx = sb_idx;
+	params.tc = txq->cos;
 
 	rc = edev->ops->q_tx_start(edev->cdev, rss_id, &params, phys_table,
 				   page_cnt, &ret_params);
@@ -1877,9 +1954,14 @@ static int qede_start_queues(struct qede_dev *edev, bool clear_stats)
 		}
 
 		if (fp->type & QEDE_FASTPATH_TX) {
-			rc = qede_start_txq(edev, fp, fp->txq, i, TX_PI(0));
-			if (rc)
-				goto out;
+			int cos;
+
+			for_each_cos_in_txq(edev, cos) {
+				rc = qede_start_txq(edev, fp, &fp->txq[cos], i,
+						    TX_PI(cos));
+				if (rc)
+					goto out;
+			}
 		}
 	}
 
@@ -1973,6 +2055,7 @@ static int qede_load(struct qede_dev *edev, enum qede_load_mode mode,
 		     bool is_locked)
 {
 	struct qed_link_params link_params;
+	u8 num_tc;
 	int rc;
 
 	DP_INFO(edev, "Starting qede load\n");
@@ -2019,6 +2102,10 @@ static int qede_load(struct qede_dev *edev, enum qede_load_mode mode,
 		goto err4;
 	DP_INFO(edev, "Start VPORT, RXQ and TXQ succeeded\n");
 
+	num_tc = netdev_get_num_tc(edev->ndev);
+	num_tc = num_tc ? num_tc : edev->dev_info.num_tc;
+	qede_setup_tc(edev->ndev, num_tc);
+
 	/* Program un-configured VLANs */
 	qede_configure_vlan_filters(edev);
 
@@ -2143,7 +2230,7 @@ static bool qede_is_txq_full(struct qede_dev *edev, struct qede_tx_queue *txq)
 {
 	struct netdev_queue *netdev_txq;
 
-	netdev_txq = netdev_get_tx_queue(edev->ndev, txq->index);
+	netdev_txq = netdev_get_tx_queue(edev->ndev, txq->ndev_txq_id);
 	if (netif_xmit_stopped(netdev_txq))
 		return true;
 
@@ -2208,9 +2295,11 @@ static void qede_get_eth_tlv_data(void *dev, void *data)
 	for_each_queue(i) {
 		fp = &edev->fp_array[i];
 		if (fp->type & QEDE_FASTPATH_TX) {
-			if (fp->txq->sw_tx_cons != fp->txq->sw_tx_prod)
+			struct qede_tx_queue *txq = QEDE_FP_TC0_TXQ(fp);
+
+			if (txq->sw_tx_cons != txq->sw_tx_prod)
 				etlv->txqs_empty = false;
-			if (qede_is_txq_full(edev, fp->txq))
+			if (qede_is_txq_full(edev, txq))
 				etlv->num_txqs_full++;
 		}
 		if (fp->type & QEDE_FASTPATH_RX) {