[PATCH net-next 1/1] net: stmmac: Add option for VLAN filter fail queue enable

[Wong Vee Khee <vee.khee.wong@intel.com>]

From: "Chuah, Kim Tatt" <kim.tatt.chuah@intel.com>

Add option in plat_stmmacenet_data struct to enable VLAN Filter Fail
Queuing. This option allows packets that fail VLAN filter to be routed
to a specific Rx queue when Receive All is also set.

When this option is enabled:
- Enable VFFQ only when entering promiscuous mode, because Receive All
  will pass up all rx packets that failed address filtering (similar to
  promiscuous mode).
- VLAN-promiscuous mode is never entered to allow rx packet to fail VLAN
  filters and get routed to selected VFFQ Rx queue.

Reviewed-by: Voon Weifeng <weifeng.voon@intel.com>
Reviewed-by: Ong Boon Leong <boon.leong.ong@intel.com>
Signed-off-by: Chuah, Kim Tatt <kim.tatt.chuah@intel.com>
Signed-off-by: Ong Boon Leong <boon.leong.ong@intel.com>
---
 drivers/net/ethernet/stmicro/stmmac/common.h      |  2 ++
 drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c |  5 +++++
 drivers/net/ethernet/stmicro/stmmac/dwmac4.h      |  1 +
 drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c | 15 +++++++++++++--
 drivers/net/ethernet/stmicro/stmmac/dwmac5.h      |  6 ++++++
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c |  3 +++
 include/linux/stmmac.h                            |  2 ++
 7 files changed, 32 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/common.h b/drivers/net/ethernet/stmicro/stmmac/common.h
index cafa8e3c3573..df7de50497a0 100644
--- a/drivers/net/ethernet/stmicro/stmmac/common.h
+++ b/drivers/net/ethernet/stmicro/stmmac/common.h
@@ -481,6 +481,8 @@ struct mac_device_info {
 	unsigned int num_vlan;
 	u32 vlan_filter[32];
 	unsigned int promisc;
+	bool vlan_fail_q_en;
+	u8 vlan_fail_q;
 };
 
 struct stmmac_rx_routing {
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c
index 2ac9dfb3462c..ab0a81e0fea1 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-intel.c
@@ -321,6 +321,11 @@ static int intel_mgbe_common_data(struct pci_dev *pdev,
 	/* Set the maxmtu to a default of JUMBO_LEN */
 	plat->maxmtu = JUMBO_LEN;
 
+	plat->vlan_fail_q_en = true;
+
+	/* Use the last Rx queue */
+	plat->vlan_fail_q = plat->rx_queues_to_use - 1;
+
 	return 0;
 }
 
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4.h b/drivers/net/ethernet/stmicro/stmmac/dwmac4.h
index 61f3249bd724..592b043f9676 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac4.h
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4.h
@@ -76,6 +76,7 @@
 #define GMAC_PACKET_FILTER_HPF		BIT(10)
 #define GMAC_PACKET_FILTER_VTFE		BIT(16)
 #define GMAC_PACKET_FILTER_IPFE		BIT(20)
+#define GMAC_PACKET_FILTER_RA		BIT(31)
 
 #define GMAC_MAX_PERFECT_ADDRESSES	128
 
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c b/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
index ecd834e0e121..002791b77356 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_core.c
@@ -618,7 +618,18 @@ static void dwmac4_set_filter(struct mac_device_info *hw,
 	value &= ~GMAC_PACKET_FILTER_PM;
 	value &= ~GMAC_PACKET_FILTER_PR;
 	if (dev->flags & IFF_PROMISC) {
-		value = GMAC_PACKET_FILTER_PR | GMAC_PACKET_FILTER_PCF;
+		/* VLAN Tag Filter Fail Packets Queuing */
+		if (hw->vlan_fail_q_en) {
+			value = readl(ioaddr + GMAC_RXQ_CTRL4);
+			value &= ~GMAC_RXQCTRL_VFFQ_MASK;
+			value |= GMAC_RXQCTRL_VFFQE |
+				 (hw->vlan_fail_q << GMAC_RXQCTRL_VFFQ_SHIFT);
+			writel(value, ioaddr + GMAC_RXQ_CTRL4);
+			value = GMAC_PACKET_FILTER_PR | GMAC_PACKET_FILTER_RA;
+		} else {
+			value = GMAC_PACKET_FILTER_PR | GMAC_PACKET_FILTER_PCF;
+		}
+
 	} else if ((dev->flags & IFF_ALLMULTI) ||
 		   (netdev_mc_count(dev) > hw->multicast_filter_bins)) {
 		/* Pass all multi */
@@ -680,7 +691,7 @@ static void dwmac4_set_filter(struct mac_device_info *hw,
 
 	writel(value, ioaddr + GMAC_PACKET_FILTER);
 
-	if (dev->flags & IFF_PROMISC) {
+	if (dev->flags & IFF_PROMISC && !hw->vlan_fail_q_en) {
 		if (!hw->promisc) {
 			hw->promisc = 1;
 			dwmac4_vlan_promisc_enable(dev, hw);
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac5.h b/drivers/net/ethernet/stmicro/stmmac/dwmac5.h
index 3e8faa96b4d4..56b0762c1276 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac5.h
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac5.h
@@ -92,6 +92,12 @@
 #define TCEIE				BIT(0)
 #define DMA_ECC_INT_STATUS		0x00001088
 
+/* EQoS version 5.xx VLAN Tag Filter Fail Packets Queuing */
+#define GMAC_RXQ_CTRL4			0x00000094
+#define GMAC_RXQCTRL_VFFQ_MASK		GENMASK(19, 17)
+#define GMAC_RXQCTRL_VFFQ_SHIFT		17
+#define GMAC_RXQCTRL_VFFQE		BIT(16)
+
 int dwmac5_safety_feat_config(void __iomem *ioaddr, unsigned int asp);
 int dwmac5_safety_feat_irq_status(struct net_device *ndev,
 		void __iomem *ioaddr, unsigned int asp,
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index df2c74bbfcff..269da57c99f6 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -4709,6 +4709,9 @@ static int stmmac_hw_init(struct stmmac_priv *priv)
 	if (priv->dma_cap.tsoen)
 		dev_info(priv->device, "TSO supported\n");
 
+	priv->hw->vlan_fail_q_en = priv->plat->vlan_fail_q_en;
+	priv->hw->vlan_fail_q = priv->plat->vlan_fail_q;
+
 	/* Run HW quirks, if any */
 	if (priv->hwif_quirks) {
 		ret = priv->hwif_quirks(priv);
diff --git a/include/linux/stmmac.h b/include/linux/stmmac.h
index bd964c31d333..00e83c877496 100644
--- a/include/linux/stmmac.h
+++ b/include/linux/stmmac.h
@@ -198,5 +198,7 @@ struct plat_stmmacenet_data {
 	int mac_port_sel_speed;
 	bool en_tx_lpi_clockgating;
 	int has_xgmac;
+	bool vlan_fail_q_en;
+	u8 vlan_fail_q;
 };
 #endif
-- 
2.17.0