bnxt_en: Introduce rss ctx structure, alloc/free functions

Add struct bnxt_rss_ctx, related storage lists, required
defines, and its alloc/free functions.

Later patches will use them in order to support multiple
RSS contexts.
Reviewed-by: Kalesh AP <kalesh-anakkur.purayil@broadcom.com>
Signed-off-by: Pavan Chebbi <pavan.chebbi@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Link: https://lore.kernel.org/r/20240325222902.220712-6-michael.chan@broadcom.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/broadcom/bnxt/bnxt.c

@@ -9925,6 +9925,53 @@ static int bnxt_alloc_rfs_vnics(struct bnxt *bp)
 	return rc;
 }
 
+void bnxt_del_one_rss_ctx(struct bnxt *bp, struct bnxt_rss_ctx *rss_ctx,
+			  bool all)
+{
+	if (!all)
+		return;
+
+	list_del(&rss_ctx->list);
+	bp->num_rss_ctx--;
+	clear_bit(rss_ctx->index, bp->rss_ctx_bmap);
+	kfree(rss_ctx);
+}
+
+struct bnxt_rss_ctx *bnxt_alloc_rss_ctx(struct bnxt *bp)
+{
+	struct bnxt_rss_ctx *rss_ctx = NULL;
+
+	rss_ctx = kzalloc(sizeof(*rss_ctx), GFP_KERNEL);
+	if (rss_ctx) {
+		rss_ctx->vnic.rss_ctx = rss_ctx;
+		list_add_tail(&rss_ctx->list, &bp->rss_ctx_list);
+		bp->num_rss_ctx++;
+	}
+	return rss_ctx;
+}
+
+void bnxt_clear_rss_ctxs(struct bnxt *bp, bool all)
+{
+	struct bnxt_rss_ctx *rss_ctx, *tmp;
+
+	list_for_each_entry_safe(rss_ctx, tmp, &bp->rss_ctx_list, list)
+		bnxt_del_one_rss_ctx(bp, rss_ctx, all);
+
+	if (all)
+		bitmap_free(bp->rss_ctx_bmap);
+}
+
+static void bnxt_init_multi_rss_ctx(struct bnxt *bp)
+{
+	bp->rss_ctx_bmap = bitmap_zalloc(BNXT_RSS_CTX_BMAP_LEN, GFP_KERNEL);
+	if (bp->rss_ctx_bmap) {
+		/* burn index 0 since we cannot have context 0 */
+		__set_bit(0, bp->rss_ctx_bmap);
+		INIT_LIST_HEAD(&bp->rss_ctx_list);
+		bp->rss_cap |= BNXT_RSS_CAP_MULTI_RSS_CTX;
+	}
+}
+
 /* Allow PF, trusted VFs and VFs with default VLAN to be in promiscuous mode */
 static bool bnxt_promisc_ok(struct bnxt *bp)
 {
@@ -14612,6 +14659,8 @@ static void bnxt_remove_one(struct pci_dev *pdev)
 	unregister_netdev(dev);
 	bnxt_free_l2_filters(bp, true);
 	bnxt_free_ntp_fltrs(bp, true);
+	if (BNXT_SUPPORTS_MULTI_RSS_CTX(bp))
+		bnxt_clear_rss_ctxs(bp, true);
 	clear_bit(BNXT_STATE_IN_FW_RESET, &bp->state);
 	/* Flush any pending tasks */
 	cancel_work_sync(&bp->sp_task);
@@ -15223,6 +15272,9 @@ static int bnxt_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 
 	INIT_LIST_HEAD(&bp->usr_fltr_list);
 
+	if (BNXT_SUPPORTS_NTUPLE_VNIC(bp))
+		bnxt_init_multi_rss_ctx(bp);
+
 	rc = register_netdev(dev);
 	if (rc)
 		goto init_err_cleanup;
@@ -15243,6 +15295,8 @@ static int bnxt_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 	bnxt_clear_int_mode(bp);
 
 init_err_pci_clean:
+	if (BNXT_SUPPORTS_MULTI_RSS_CTX(bp))
+		bnxt_clear_rss_ctxs(bp, true);
 	bnxt_hwrm_func_drv_unrgtr(bp);
 	bnxt_free_hwrm_resources(bp);
 	bnxt_hwmon_uninit(bp);

drivers/net/ethernet/broadcom/bnxt/bnxt.h

@@ -1256,9 +1256,21 @@ struct bnxt_vnic_info {
 #define BNXT_VNIC_UCAST_FLAG	8
 #define BNXT_VNIC_RFS_NEW_RSS_FLAG	0x10
 #define BNXT_VNIC_NTUPLE_FLAG		0x20
+#define BNXT_VNIC_RSSCTX_FLAG		0x40
+	struct bnxt_rss_ctx	*rss_ctx;
 	u32		vnic_id;
 };
 
+struct bnxt_rss_ctx {
+	struct list_head list;
+	struct bnxt_vnic_info vnic;
+	u16	*rss_indir_tbl;
+	u8	index;
+};
+
+#define BNXT_MAX_ETH_RSS_CTX	32
+#define BNXT_RSS_CTX_BMAP_LEN	(BNXT_MAX_ETH_RSS_CTX + 1)
+
 struct bnxt_hw_rings {
 	int tx;
 	int rx;
@@ -2228,6 +2240,9 @@ struct bnxt {
 	/* grp_info indexed by completion ring index */
 	struct bnxt_ring_grp_info	*grp_info;
 	struct bnxt_vnic_info	*vnic_info;
+	struct list_head	rss_ctx_list;
+	unsigned long		*rss_ctx_bmap;
+	u32			num_rss_ctx;
 	int			nr_vnics;
 	u16			*rss_indir_tbl;
 	u16			rss_indir_tbl_entries;
@@ -2242,6 +2257,7 @@ struct bnxt {
 #define BNXT_RSS_CAP_AH_V6_RSS_CAP		BIT(5)
 #define BNXT_RSS_CAP_ESP_V4_RSS_CAP		BIT(6)
 #define BNXT_RSS_CAP_ESP_V6_RSS_CAP		BIT(7)
+#define BNXT_RSS_CAP_MULTI_RSS_CTX		BIT(8)
 
 	u8			rss_hash_key[HW_HASH_KEY_SIZE];
 	u8			rss_hash_key_valid:1;
@@ -2341,6 +2357,10 @@ struct bnxt {
 #define BNXT_SUPPORTS_NTUPLE_VNIC(bp)	\
 	(BNXT_PF(bp) && ((bp)->fw_cap & BNXT_FW_CAP_CFA_RFS_RING_TBL_IDX_V3))
 
+#define BNXT_SUPPORTS_MULTI_RSS_CTX(bp)				\
+	(BNXT_PF(bp) && BNXT_SUPPORTS_NTUPLE_VNIC(bp) &&	\
+	 ((bp)->rss_cap & BNXT_RSS_CAP_MULTI_RSS_CTX))
+
 	u32			hwrm_spec_code;
 	u16			hwrm_cmd_seq;
 	u16                     hwrm_cmd_kong_seq;
@@ -2723,6 +2743,10 @@ int bnxt_hwrm_func_resc_qcaps(struct bnxt *bp, bool all);
 int bnxt_hwrm_func_qcaps(struct bnxt *bp);
 int bnxt_hwrm_fw_set_time(struct bnxt *);
 int bnxt_hwrm_vnic_rss_cfg_p5(struct bnxt *bp, struct bnxt_vnic_info *vnic);
+void bnxt_del_one_rss_ctx(struct bnxt *bp, struct bnxt_rss_ctx *rss_ctx,
+			  bool all);
+struct bnxt_rss_ctx *bnxt_alloc_rss_ctx(struct bnxt *bp);
+void bnxt_clear_rss_ctxs(struct bnxt *bp, bool all);
 int bnxt_open_nic(struct bnxt *, bool, bool);
 int bnxt_half_open_nic(struct bnxt *bp);
 void bnxt_half_close_nic(struct bnxt *bp);

drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c

@@ -969,6 +969,8 @@ static int bnxt_set_channels(struct net_device *dev,
 	}
 
 	bnxt_clear_usr_fltrs(bp, true);
+	if (BNXT_SUPPORTS_MULTI_RSS_CTX(bp))
+		bnxt_clear_rss_ctxs(bp, false);
 	if (netif_running(dev)) {
 		if (BNXT_PF(bp)) {
 			/* TODO CHIMP_FW: Send message to all VF's