net: ethernet: mtk_eth_soc: ppe: add support for multiple PPEs

Add the missing pieces to allow multiple PPEs units, one for each GMAC.
mtk_gdm_config has been modified to work on targted mac ID,
the inner loop moved outside of the function to allow unrelated
operations like setting the MAC's PPE index.
Introduce a sanity check in flow_offload_replace to account for
non-MTK ingress devices.
Additional field 'ppe_idx' was added to struct mtk_mac in order
to keep track on the assigned PPE unit.

Signed-off-by: Elad Yifee <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

drivers/net/ethernet/mediatek/mtk_eth_soc.c

···
 		.fq_blen	= 0x1b2c,
 	},
 	.gdm1_cnt		= 0x2400,
-	.gdma_to_ppe		= 0x4444,
+	.gdma_to_ppe	= {
+		[0]		= 0x4444,
+	},
 	.ppe_base		= 0x0c00,
 	.wdma_base = {
 		[0]		= 0x2800,
···
 		.tx_sch_rate	= 0x4798,
 	},
 	.gdm1_cnt		= 0x1c00,
-	.gdma_to_ppe		= 0x3333,
+	.gdma_to_ppe	= {
+		[0]		= 0x3333,
+		[1]		= 0x4444,
+	},
 	.ppe_base		= 0x2000,
 	.wdma_base = {
 		[0]		= 0x4800,
···
 		.tx_sch_rate	= 0x4798,
 	},
 	.gdm1_cnt		= 0x1c00,
-	.gdma_to_ppe		= 0x3333,
+	.gdma_to_ppe	= {
+		[0]		= 0x3333,
+		[1]		= 0x4444,
+		[2]		= 0xcccc,
+	},
 	.ppe_base		= 0x2000,
 	.wdma_base = {
 		[0]		= 0x4800,
···
 	struct mtk_rx_dma_v2 *rxd, trxd;
 	int done = 0, bytes = 0;
 	dma_addr_t dma_addr = DMA_MAPPING_ERROR;
+	int ppe_idx = 0;
 
 	while (done < budget) {
 		unsigned int pktlen, *rxdcsum;
···
 			goto release_desc;
 
 		netdev = eth->netdev[mac];
+		ppe_idx = eth->mac[mac]->ppe_idx;
 
 		if (unlikely(test_bit(MTK_RESETTING, &eth->state)))
 			goto release_desc;
···
 		}
 
 		if (reason == MTK_PPE_CPU_REASON_HIT_UNBIND_RATE_REACHED)
-			mtk_ppe_check_skb(eth->ppe[0], skb, hash);
+			mtk_ppe_check_skb(eth->ppe[ppe_idx], skb, hash);
 
 		skb_record_rx_queue(skb, 0);
 		napi_gro_receive(napi, skb);
···
 	return 0;
 }
 
-static void mtk_gdm_config(struct mtk_eth *eth, u32 config)
+static void mtk_gdm_config(struct mtk_eth *eth, u32 id, u32 config)
 {
-	int i;
+	u32 val;
 
 	if (MTK_HAS_CAPS(eth->soc->caps, MTK_SOC_MT7628))
 		return;
 
-	for (i = 0; i < MTK_MAX_DEVS; i++) {
-		u32 val;
+	val = mtk_r32(eth, MTK_GDMA_FWD_CFG(id));
 
-		if (!eth->netdev[i])
-			continue;
+	/* default setup the forward port to send frame to PDMA */
+	val &= ~0xffff;
 
-		val = mtk_r32(eth, MTK_GDMA_FWD_CFG(i));
+	/* Enable RX checksum */
+	val |= MTK_GDMA_ICS_EN | MTK_GDMA_TCS_EN | MTK_GDMA_UCS_EN;
 
-		/* default setup the forward port to send frame to PDMA */
-		val &= ~0xffff;
+	val |= config;
 
-		/* Enable RX checksum */
-		val |= MTK_GDMA_ICS_EN | MTK_GDMA_TCS_EN | MTK_GDMA_UCS_EN;
+	if (eth->netdev[id] && netdev_uses_dsa(eth->netdev[id]))
+		val |= MTK_GDMA_SPECIAL_TAG;
 
-		val |= config;
-
-		if (netdev_uses_dsa(eth->netdev[i]))
-			val |= MTK_GDMA_SPECIAL_TAG;
-
-		mtk_w32(eth, val, MTK_GDMA_FWD_CFG(i));
-	}
-	/* Reset and enable PSE */
-	mtk_w32(eth, RST_GL_PSE, MTK_RST_GL);
-	mtk_w32(eth, 0, MTK_RST_GL);
+	mtk_w32(eth, val, MTK_GDMA_FWD_CFG(id));
 }
 
 
···
 {
 	struct mtk_mac *mac = netdev_priv(dev);
 	struct mtk_eth *eth = mac->hw;
-	int i, err;
+	struct mtk_mac *target_mac;
+	int i, err, ppe_num;
+
+	ppe_num = eth->soc->ppe_num;
 
 	err = phylink_of_phy_connect(mac->phylink, mac->of_node, 0);
 	if (err) {
···
 		for (i = 0; i < ARRAY_SIZE(eth->ppe); i++)
 			mtk_ppe_start(eth->ppe[i]);
 
-		gdm_config = soc->offload_version ? soc->reg_map->gdma_to_ppe
-						  : MTK_GDMA_TO_PDMA;
-		mtk_gdm_config(eth, gdm_config);
+		for (i = 0; i < MTK_MAX_DEVS; i++) {
+			if (!eth->netdev[i])
+				break;
+
+			target_mac = netdev_priv(eth->netdev[i]);
+			if (!soc->offload_version) {
+				target_mac->ppe_idx = 0;
+				gdm_config = MTK_GDMA_TO_PDMA;
+			} else if (ppe_num >= 3 && target_mac->id == 2) {
+				target_mac->ppe_idx = 2;
+				gdm_config = soc->reg_map->gdma_to_ppe[2];
+			} else if (ppe_num >= 2 && target_mac->id == 1) {
+				target_mac->ppe_idx = 1;
+				gdm_config = soc->reg_map->gdma_to_ppe[1];
+			} else {
+				target_mac->ppe_idx = 0;
+				gdm_config = soc->reg_map->gdma_to_ppe[0];
+			}
+			mtk_gdm_config(eth, target_mac->id, gdm_config);
+		}
+		/* Reset and enable PSE */
+		mtk_w32(eth, RST_GL_PSE, MTK_RST_GL);
+		mtk_w32(eth, 0, MTK_RST_GL);
 
 		napi_enable(&eth->tx_napi);
 		napi_enable(&eth->rx_napi);
 		mtk_tx_irq_enable(eth, MTK_TX_DONE_INT);
 		mtk_rx_irq_enable(eth, soc->rx.irq_done_mask);
 		refcount_set(&eth->dma_refcnt, 1);
-	}
-	else
+	} else {
 		refcount_inc(&eth->dma_refcnt);
+	}
 
 	phylink_start(mac->phylink);
 	netif_tx_start_all_queues(dev);
···
 	if (!refcount_dec_and_test(&eth->dma_refcnt))
 		return 0;
 
-	mtk_gdm_config(eth, MTK_GDMA_DROP_ALL);
+	for (i = 0; i < MTK_MAX_DEVS; i++)
+		mtk_gdm_config(eth, i, MTK_GDMA_DROP_ALL);
 
 	mtk_tx_irq_disable(eth, MTK_TX_DONE_INT);
 	mtk_rx_irq_disable(eth, eth->soc->rx.irq_done_mask);
···
 	}
 
 	if (eth->soc->offload_version) {
-		u32 num_ppe = mtk_is_netsys_v2_or_greater(eth) ? 2 : 1;
+		u8 ppe_num = eth->soc->ppe_num;
 
-		num_ppe = min_t(u32, ARRAY_SIZE(eth->ppe), num_ppe);
-		for (i = 0; i < num_ppe; i++) {
-			u32 ppe_addr = eth->soc->reg_map->ppe_base + i * 0x400;
+		ppe_num = min_t(u8, ARRAY_SIZE(eth->ppe), ppe_num);
+		for (i = 0; i < ppe_num; i++) {
+			u32 ppe_addr = eth->soc->reg_map->ppe_base;
 
+			ppe_addr += (i == 2 ? 0xc00 : i * 0x400);
 			eth->ppe[i] = mtk_ppe_init(eth, eth->base + ppe_addr, i);
 
 			if (!eth->ppe[i]) {
 				err = -ENOMEM;
 				goto err_deinit_ppe;
 			}
-		}
+			err = mtk_eth_offload_init(eth, i);
 
-		err = mtk_eth_offload_init(eth);
-		if (err)
-			goto err_deinit_ppe;
+			if (err)
+				goto err_deinit_ppe;
+		}
 	}
 
 	for (i = 0; i < MTK_MAX_DEVS; i++) {
···
 	.required_pctl = false,
 	.version = 1,
 	.offload_version = 1,
+	.ppe_num = 1,
 	.hash_offset = 2,
 	.foe_entry_size = MTK_FOE_ENTRY_V1_SIZE,
 	.tx = {
···
 	.required_pctl = false,
 	.version = 1,
 	.offload_version = 2,
+	.ppe_num = 1,
 	.hash_offset = 2,
 	.has_accounting = true,
 	.foe_entry_size = MTK_FOE_ENTRY_V1_SIZE,
···
 	.required_pctl = true,
 	.version = 1,
 	.offload_version = 1,
+	.ppe_num = 1,
 	.hash_offset = 2,
 	.foe_entry_size = MTK_FOE_ENTRY_V1_SIZE,
 	.disable_pll_modes = true,
···
 	.required_pctl = false,
 	.version = 2,
 	.offload_version = 2,
+	.ppe_num = 2,
 	.hash_offset = 4,
 	.has_accounting = true,
 	.foe_entry_size = MTK_FOE_ENTRY_V2_SIZE,
···
 	.required_pctl = false,
 	.version = 2,
 	.offload_version = 2,
+	.ppe_num = 2,
 	.hash_offset = 4,
 	.has_accounting = true,
 	.foe_entry_size = MTK_FOE_ENTRY_V2_SIZE,
···
 	.required_pctl = false,
 	.version = 3,
 	.offload_version = 2,
+	.ppe_num = 3,
 	.hash_offset = 4,
 	.has_accounting = true,
 	.foe_entry_size = MTK_FOE_ENTRY_V3_SIZE,

drivers/net/ethernet/mediatek/mtk_eth_soc.h

···
 		u32	tx_sch_rate;	/* tx scheduler rate control registers */
 	} qdma;
 	u32	gdm1_cnt;
-	u32	gdma_to_ppe;
+	u32	gdma_to_ppe[3];
 	u32	ppe_base;
 	u32	wdma_base[3];
 	u32	pse_iq_sta;
···
 	u8		offload_version;
 	u8		hash_offset;
 	u8		version;
+	u8		ppe_num;
 	u16		foe_entry_size;
 	netdev_features_t hw_features;
 	bool		has_accounting;
···
 
 	struct metadata_dst		*dsa_meta[MTK_MAX_DSA_PORTS];
 
-	struct mtk_ppe			*ppe[2];
+	struct mtk_ppe			*ppe[3];
 	struct rhashtable		flow_table;
 
 	struct bpf_prog			__rcu *prog;
···
 struct mtk_mac {
 	int				id;
 	phy_interface_t			interface;
+	u8				ppe_idx;
 	int				speed;
 	struct device_node		*of_node;
 	struct phylink			*phylink;
···
 int mtk_gmac_gephy_path_setup(struct mtk_eth *eth, int mac_id);
 int mtk_gmac_rgmii_path_setup(struct mtk_eth *eth, int mac_id);
 
-int mtk_eth_offload_init(struct mtk_eth *eth);
+int mtk_eth_offload_init(struct mtk_eth *eth, u8 id);
 int mtk_eth_setup_tc(struct net_device *dev, enum tc_setup_type type,
 		     void *type_data);
 int mtk_flow_offload_cmd(struct mtk_eth *eth, struct flow_cls_offload *cls,

drivers/net/ethernet/mediatek/mtk_ppe_offload.c

···
 			 int ppe_index)
 {
 	struct flow_rule *rule = flow_cls_offload_flow_rule(f);
+	struct net_device *idev = NULL, *odev = NULL;
 	struct flow_action_entry *act;
 	struct mtk_flow_data data = {};
 	struct mtk_foe_entry foe;
-	struct net_device *odev = NULL;
 	struct mtk_flow_entry *entry;
 	int offload_type = 0;
 	int wed_index = -1;
···
 		struct flow_match_meta match;
 
 		flow_rule_match_meta(rule, &match);
+		if (mtk_is_netsys_v2_or_greater(eth)) {
+			idev = __dev_get_by_index(&init_net, match.key->ingress_ifindex);
+			if (idev) {
+				struct mtk_mac *mac = netdev_priv(idev);
+
+				if (WARN_ON(mac->ppe_idx >= eth->soc->ppe_num))
+					return -EINVAL;
+
+				ppe_index = mac->ppe_idx;
+			}
+		}
 	} else {
 		return -EOPNOTSUPP;
 	}
···
 	}
 }
 
-int mtk_eth_offload_init(struct mtk_eth *eth)
+int mtk_eth_offload_init(struct mtk_eth *eth, u8 id)
 {
+	if (!eth->ppe[id] || !eth->ppe[id]->foe_table)
+		return 0;
 	return rhashtable_init(&eth->flow_table, &mtk_flow_ht_params);
 }