bng_en: Introduce VNIC

Add the VNIC-specific structures and DMA memory necessary to support
UC/MC and RSS functionality.

Signed-off-by: Bhargava Marreddy <[email protected]>
Reviewed-by: Vikas Gupta <[email protected]>
Reviewed-by: Rajashekar Hudumula <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

Author: bmarreddy

drivers/net/ethernet/broadcom/bnge/bnge_netdev.c

@@ -439,12 +439,122 @@ static int bnge_alloc_tx_rings(struct bnge_net *bn)
 	return rc;
 }
 
+static void bnge_free_vnic_attributes(struct bnge_net *bn)
+{
+	struct pci_dev *pdev = bn->bd->pdev;
+	struct bnge_vnic_info *vnic;
+	int i;
+
+	if (!bn->vnic_info)
+		return;
+
+	for (i = 0; i < bn->nr_vnics; i++) {
+		vnic = &bn->vnic_info[i];
+
+		kfree(vnic->uc_list);
+		vnic->uc_list = NULL;
+
+		if (vnic->mc_list) {
+			dma_free_coherent(&pdev->dev, vnic->mc_list_size,
+					  vnic->mc_list, vnic->mc_list_mapping);
+			vnic->mc_list = NULL;
+		}
+
+		if (vnic->rss_table) {
+			dma_free_coherent(&pdev->dev, vnic->rss_table_size,
+					  vnic->rss_table,
+					  vnic->rss_table_dma_addr);
+			vnic->rss_table = NULL;
+		}
+
+		vnic->rss_hash_key = NULL;
+		vnic->flags = 0;
+	}
+}
+
+static int bnge_alloc_vnic_attributes(struct bnge_net *bn)
+{
+	struct bnge_dev *bd = bn->bd;
+	struct bnge_vnic_info *vnic;
+	int i, size;
+
+	for (i = 0; i < bn->nr_vnics; i++) {
+		vnic = &bn->vnic_info[i];
+
+		if (vnic->flags & BNGE_VNIC_UCAST_FLAG) {
+			int mem_size = (BNGE_MAX_UC_ADDRS - 1) * ETH_ALEN;
+
+			vnic->uc_list = kmalloc(mem_size, GFP_KERNEL);
+			if (!vnic->uc_list)
+				goto err_free_vnic_attributes;
+		}
+
+		if (vnic->flags & BNGE_VNIC_MCAST_FLAG) {
+			vnic->mc_list_size = BNGE_MAX_MC_ADDRS * ETH_ALEN;
+			vnic->mc_list =
+				dma_alloc_coherent(bd->dev,
+						   vnic->mc_list_size,
+						   &vnic->mc_list_mapping,
+						   GFP_KERNEL);
+			if (!vnic->mc_list)
+				goto err_free_vnic_attributes;
+		}
+
+		/* Allocate rss table and hash key */
+		size = L1_CACHE_ALIGN(BNGE_MAX_RSS_TABLE_SIZE);
+
+		vnic->rss_table_size = size + HW_HASH_KEY_SIZE;
+		vnic->rss_table = dma_alloc_coherent(bd->dev,
+						     vnic->rss_table_size,
+						     &vnic->rss_table_dma_addr,
+						     GFP_KERNEL);
+		if (!vnic->rss_table)
+			goto err_free_vnic_attributes;
+
+		vnic->rss_hash_key = ((void *)vnic->rss_table) + size;
+		vnic->rss_hash_key_dma_addr = vnic->rss_table_dma_addr + size;
+	}
+	return 0;
+
+err_free_vnic_attributes:
+	bnge_free_vnic_attributes(bn);
+	return -ENOMEM;
+}
+
+static int bnge_alloc_vnics(struct bnge_net *bn)
+{
+	int num_vnics;
+
+	/* Allocate only 1 VNIC for now
+	 * Additional VNICs will be added based on RFS/NTUPLE in future patches
+	 */
+	num_vnics = 1;
+
+	bn->vnic_info = kcalloc(num_vnics, sizeof(struct bnge_vnic_info),
+				GFP_KERNEL);
+	if (!bn->vnic_info)
+		return -ENOMEM;
+
+	bn->nr_vnics = num_vnics;
+
+	return 0;
+}
+
+static void bnge_free_vnics(struct bnge_net *bn)
+{
+	kfree(bn->vnic_info);
+	bn->vnic_info = NULL;
+	bn->nr_vnics = 0;
+}
+
 static void bnge_free_core(struct bnge_net *bn)
 {
+	bnge_free_vnic_attributes(bn);
 	bnge_free_tx_rings(bn);
 	bnge_free_rx_rings(bn);
 	bnge_free_nq_tree(bn);
 	bnge_free_nq_arrays(bn);
+	bnge_free_vnics(bn);
 	kfree(bn->tx_ring_map);
 	bn->tx_ring_map = NULL;
 	kfree(bn->tx_ring);
@@ -531,6 +641,10 @@ static int bnge_alloc_core(struct bnge_net *bn)
 		txr->bnapi = bnapi2;
 	}
 
+	rc = bnge_alloc_vnics(bn);
+	if (rc)
+		goto err_free_core;
+
 	rc = bnge_alloc_nq_arrays(bn);
 	if (rc)
 		goto err_free_core;
@@ -546,6 +660,13 @@ static int bnge_alloc_core(struct bnge_net *bn)
 		goto err_free_core;
 
 	rc = bnge_alloc_nq_tree(bn);
+	if (rc)
+		goto err_free_core;
+
+	bn->vnic_info[BNGE_VNIC_DEFAULT].flags |= BNGE_VNIC_RSS_FLAG |
+						  BNGE_VNIC_MCAST_FLAG |
+						  BNGE_VNIC_UCAST_FLAG;
+	rc = bnge_alloc_vnic_attributes(bn);
 	if (rc)
 		goto err_free_core;
 	return 0;

drivers/net/ethernet/broadcom/bnge/bnge_netdev.h

@@ -176,6 +176,8 @@ struct bnge_net {
 	u16				*tx_ring_map;
 	enum dma_data_direction		rx_dir;
 
+	struct bnge_vnic_info		*vnic_info;
+	int				nr_vnics;
 	int				total_irqs;
 };
 
@@ -300,4 +302,32 @@ struct bnge_napi {
 	struct bnge_tx_ring_info	*tx_ring[BNGE_MAX_TXR_PER_NAPI];
 };
 
+#define INVALID_STATS_CTX_ID	-1
+#define BNGE_VNIC_DEFAULT	0
+#define BNGE_MAX_UC_ADDRS	4
+
+struct bnge_vnic_info {
+	u8		*uc_list;
+	dma_addr_t	rss_table_dma_addr;
+	__le16		*rss_table;
+	dma_addr_t	rss_hash_key_dma_addr;
+	u64		*rss_hash_key;
+	int		rss_table_size;
+#define BNGE_RSS_TABLE_ENTRIES		64
+#define BNGE_RSS_TABLE_SIZE		(BNGE_RSS_TABLE_ENTRIES * 4)
+#define BNGE_RSS_TABLE_MAX_TBL		8
+#define BNGE_MAX_RSS_TABLE_SIZE			\
+	(BNGE_RSS_TABLE_SIZE * BNGE_RSS_TABLE_MAX_TBL)
+
+	u8		*mc_list;
+	int		mc_list_size;
+	int		mc_list_count;
+	dma_addr_t	mc_list_mapping;
+#define BNGE_MAX_MC_ADDRS	16
+
+	u32		flags;
+#define BNGE_VNIC_RSS_FLAG	1
+#define BNGE_VNIC_MCAST_FLAG	4
+#define BNGE_VNIC_UCAST_FLAG	8
+};
 #endif /* _BNGE_NETDEV_H_ */