[openwrt/openwrt] mvebu: backport mvneta basic MQPrio patch

[LEDE Commits]

hauke pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/4580516bfbb05fe5e78416155289bf75a51c4287

commit 4580516bfbb05fe5e78416155289bf75a51c4287
Author: Kabuli Chana <newtownBuild at gmail.com>
AuthorDate: Fri Nov 5 08:19:17 2021 -0600

    mvebu: backport mvneta basic MQPrio patch
    
    Implement a basic MQPrio support, inserting rules in RX that translate
    the TC to prio mapping into vlan prio to queues.
    
    Signed-off-by: Kabuli Chana <newtownBuild at gmail.com>
---
 ...1-v5.14-net-ethernet-marvell-mvnetaMQPrio.patch | 109 +++++++++++++++++++++
 1 file changed, 109 insertions(+)

diff --git a/target/linux/mvebu/patches-5.10/701-v5.14-net-ethernet-marvell-mvnetaMQPrio.patch b/target/linux/mvebu/patches-5.10/701-v5.14-net-ethernet-marvell-mvnetaMQPrio.patch
new file mode 100644
index 0000000000..36d4942f8b
--- /dev/null
+++ b/target/linux/mvebu/patches-5.10/701-v5.14-net-ethernet-marvell-mvnetaMQPrio.patch
@@ -0,0 +1,109 @@
+From 4906887a8ae5f1296f8079bcf4565a6092a8e402 Mon Sep 17 00:00:00 2001
+From: Maxime Chevallier <maxime.chevallier at bootlin.com>
+Date: Tue, 16 Feb 2021 10:25:36 +0100
+Subject: net: mvneta: Implement mqprio support
+
+Implement a basic MQPrio support, inserting rules in RX that translate
+the TC to prio mapping into vlan prio to queues.
+
+The TX logic stays the same as when we don't offload the qdisc.
+
+Signed-off-by: Maxime Chevallier <maxime.chevallier at bootlin.com>
+Signed-off-by: David S. Miller <davem at davemloft.net>
+---
+ drivers/net/ethernet/marvell/mvneta.c | 61 +++++++++++++++++++++++++++++++++++
+ 1 file changed, 61 insertions(+)
+
+(limited to 'drivers/net/ethernet/marvell/mvneta.c')
+
+--- a/drivers/net/ethernet/marvell/mvneta.c
++++ b/drivers/net/ethernet/marvell/mvneta.c
+@@ -102,6 +102,8 @@
+ #define      MVNETA_TX_NO_DATA_SWAP              BIT(5)
+ #define      MVNETA_DESC_SWAP                    BIT(6)
+ #define      MVNETA_TX_BRST_SZ_MASK(burst)       ((burst) << 22)
++#define	MVNETA_VLAN_PRIO_TO_RXQ			 0x2440
++#define      MVNETA_VLAN_PRIO_RXQ_MAP(prio, rxq) ((rxq) << ((prio) * 3))
+ #define MVNETA_PORT_STATUS                       0x2444
+ #define      MVNETA_TX_IN_PRGRS                  BIT(0)
+ #define      MVNETA_TX_FIFO_EMPTY                BIT(8)
+@@ -490,6 +492,7 @@ struct mvneta_port {
+ 	u8 mcast_count[256];
+ 	u16 tx_ring_size;
+ 	u16 rx_ring_size;
++	u8 prio_tc_map[8];
+ 
+ 	phy_interface_t phy_interface;
+ 	struct device_node *dn;
+@@ -4913,6 +4916,63 @@ static u16 mvneta_select_queue(struct ne
+ }
+ #endif
+ 
++static void mvneta_clear_rx_prio_map(struct mvneta_port *pp)
++{
++	mvreg_write(pp, MVNETA_VLAN_PRIO_TO_RXQ, 0);
++}
++
++static void mvneta_setup_rx_prio_map(struct mvneta_port *pp)
++{
++	u32 val = 0;
++	int i;
++
++	for (i = 0; i < rxq_number; i++)
++		val |= MVNETA_VLAN_PRIO_RXQ_MAP(i, pp->prio_tc_map[i]);
++
++	mvreg_write(pp, MVNETA_VLAN_PRIO_TO_RXQ, val);
++}
++
++static int mvneta_setup_mqprio(struct net_device *dev,
++			       struct tc_mqprio_qopt *qopt)
++{
++	struct mvneta_port *pp = netdev_priv(dev);
++	u8 num_tc;
++	int i;
++
++	qopt->hw = TC_MQPRIO_HW_OFFLOAD_TCS;
++	num_tc = qopt->num_tc;
++
++	if (num_tc > rxq_number)
++		return -EINVAL;
++
++	if (!num_tc) {
++		mvneta_clear_rx_prio_map(pp);
++		netdev_reset_tc(dev);
++		return 0;
++	}
++
++	memcpy(pp->prio_tc_map, qopt->prio_tc_map, sizeof(pp->prio_tc_map));
++
++	mvneta_setup_rx_prio_map(pp);
++
++	netdev_set_num_tc(dev, qopt->num_tc);
++	for (i = 0; i < qopt->num_tc; i++)
++		netdev_set_tc_queue(dev, i, qopt->count[i], qopt->offset[i]);
++
++	return 0;
++}
++
++static int mvneta_setup_tc(struct net_device *dev, enum tc_setup_type type,
++			   void *type_data)
++{
++	switch (type) {
++	case TC_SETUP_QDISC_MQPRIO:
++		return mvneta_setup_mqprio(dev, type_data);
++	default:
++		return -EOPNOTSUPP;
++	}
++}
++
+ static const struct net_device_ops mvneta_netdev_ops = {
+ 	.ndo_open            = mvneta_open,
+ 	.ndo_stop            = mvneta_stop,
+@@ -4928,6 +4988,7 @@ static const struct net_device_ops mvnet
+ #endif
+ 	.ndo_bpf	     = mvneta_xdp,
+ 	.ndo_xdp_xmit        = mvneta_xdp_xmit,
++	.ndo_setup_tc	     = mvneta_setup_tc,
+ };
+ 
+ static const struct ethtool_ops mvneta_eth_tool_ops = {