netdev - [RFC net-next 2/5] net: airoha: Introduce ndo_select

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Message-ID: <a7d8ec3d70d7a0e2208909189e46a63e769f8f9d.1733930558.git.lorenzo@kernel.org>
Date: Wed, 11 Dec 2024 16:31:50 +0100
From: Lorenzo Bianconi <lorenzo@...nel.org>
To: netdev@...r.kernel.org
Cc: andrew@...n.ch,
	olteanv@...il.com,
	davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	horms@...nel.org,
	nbd@....name,
	sean.wang@...iatek.com,
	Mark-MC.Lee@...iatek.com,
	lorenzo.bianconi83@...il.com
Subject: [RFC net-next 2/5] net: airoha: Introduce ndo_select_queue callback

Airoha EN7581 SoC supports 32 Tx DMA rings used to feed packets to 32
QoS channels. Each channels supports 8 QoS queues where the user can
apply QoS scheduling policies. In a similar way, the user can configure
hw rate shaping for each QoS channel.
Introduce ndo_select_queue callback in order to select the tx queue
based on QoS channel and QoS queue. In particular, for dsa device select
QoS channel according to the dsa user port index, rely on port id
otherwise. Select QoS queue based on the skb priority.

Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
---
 drivers/net/ethernet/mediatek/airoha_eth.c | 28 ++++++++++++++++++++--
 1 file changed, 26 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mediatek/airoha_eth.c b/drivers/net/ethernet/mediatek/airoha_eth.c
index dd8d65a7e255..8b927bf310ed 100644
--- a/drivers/net/ethernet/mediatek/airoha_eth.c
+++ b/drivers/net/ethernet/mediatek/airoha_eth.c
@@ -23,6 +23,7 @@
 #define AIROHA_MAX_NUM_XSI_RSTS		5
 #define AIROHA_MAX_MTU			2000
 #define AIROHA_MAX_PACKET_SIZE		2048
+#define AIROHA_NUM_QOS_QUEUES		8
 #define AIROHA_NUM_TX_RING		32
 #define AIROHA_NUM_RX_RING		32
 #define AIROHA_FE_MC_MAX_VLAN_TABLE	64
@@ -2417,21 +2418,43 @@ static void airoha_dev_get_stats64(struct net_device *dev,
 	} while (u64_stats_fetch_retry(&port->stats.syncp, start));
 }
 
+static u16 airoha_dev_select_queue(struct net_device *dev, struct sk_buff *skb,
+				   struct net_device *sb_dev)
+{
+	struct airoha_gdm_port *port = netdev_priv(dev);
+	u16 queue;
+
+	/* For dsa device select QoS channel according to the dsa user port
+	 * index, rely on port id otherwise. Select QoS queue based on the
+	 * skb priority.
+	 */
+	queue = netdev_uses_dsa(dev) ? skb_get_queue_mapping(skb) : port->id;
+	queue = queue * AIROHA_NUM_QOS_QUEUES +		/* QoS channel */
+		skb->priority % AIROHA_NUM_QOS_QUEUES;	/* QoS queue */
+
+	return queue < dev->num_tx_queues ? queue : 0;
+}
+
 static netdev_tx_t airoha_dev_xmit(struct sk_buff *skb,
 				   struct net_device *dev)
 {
 	struct skb_shared_info *sinfo = skb_shinfo(skb);
 	struct airoha_gdm_port *port = netdev_priv(dev);
-	u32 msg0 = 0, msg1, len = skb_headlen(skb);
-	int i, qid = skb_get_queue_mapping(skb);
+	u32 msg0, msg1, len = skb_headlen(skb);
 	struct airoha_qdma *qdma = port->qdma;
 	u32 nr_frags = 1 + sinfo->nr_frags;
 	struct netdev_queue *txq;
 	struct airoha_queue *q;
 	void *data = skb->data;
+	int i, qid;
 	u16 index;
 	u8 fport;
 
+	qid = skb_get_queue_mapping(skb) % ARRAY_SIZE(qdma->q_tx);
+	msg0 = FIELD_PREP(QDMA_ETH_TXMSG_CHAN_MASK,
+			  qid / AIROHA_NUM_QOS_QUEUES) |
+	       FIELD_PREP(QDMA_ETH_TXMSG_QUEUE_MASK,
+			  qid % AIROHA_NUM_QOS_QUEUES);
 	if (skb->ip_summed == CHECKSUM_PARTIAL)
 		msg0 |= FIELD_PREP(QDMA_ETH_TXMSG_TCO_MASK, 1) |
 			FIELD_PREP(QDMA_ETH_TXMSG_UCO_MASK, 1) |
@@ -2605,6 +2628,7 @@ static const struct net_device_ops airoha_netdev_ops = {
 	.ndo_init		= airoha_dev_init,
 	.ndo_open		= airoha_dev_open,
 	.ndo_stop		= airoha_dev_stop,
+	.ndo_select_queue	= airoha_dev_select_queue,
 	.ndo_start_xmit		= airoha_dev_xmit,
 	.ndo_get_stats64        = airoha_dev_get_stats64,
 	.ndo_set_mac_address	= airoha_dev_set_macaddr,
-- 
2.47.1