octeontx2-af: Install TC filter rules in hardware based on priority

As of today, hardware does not support installing tc filter
rules based on priority. This patch adds support to install
the hardware rules based on priority. The final hardware rules
will not be dependent on rule installation order, it will be strictly
priority based, same as software.
Signed-off-by: Suman Ghosh <sumang@marvell.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Link: https://lore.kernel.org/r/20230721043925.2627806-1-sumang@marvell.comSigned-off-by: Paolo Abeni <pabeni@redhat.com>

drivers/net/ethernet/marvell/octeontx2/af/mbox.h

@@ -235,7 +235,7 @@ M(NPC_GET_KEX_CFG,	  0x600c, npc_get_kex_cfg,			\
 M(NPC_INSTALL_FLOW,	  0x600d, npc_install_flow,			       \
 				  npc_install_flow_req, npc_install_flow_rsp)  \
 M(NPC_DELETE_FLOW,	  0x600e, npc_delete_flow,			\
-				  npc_delete_flow_req, msg_rsp)		\
+				  npc_delete_flow_req, npc_delete_flow_rsp)		\
 M(NPC_MCAM_READ_ENTRY,	  0x600f, npc_mcam_read_entry,			\
 				  npc_mcam_read_entry_req,		\
 				  npc_mcam_read_entry_rsp)		\
@@ -1491,6 +1491,8 @@ struct npc_install_flow_req {
 	u8  vtag0_op;
 	u16 vtag1_def;
 	u8  vtag1_op;
+	/* old counter value */
+	u16 cntr_val;
 };
 
 struct npc_install_flow_rsp {
@@ -1506,6 +1508,11 @@ struct npc_delete_flow_req {
 	u8 all; /* PF + VFs */
 };
 
+struct npc_delete_flow_rsp {
+	struct mbox_msghdr hdr;
+	u16 cntr_val;
+};
+
 struct npc_mcam_read_entry_req {
 	struct mbox_msghdr hdr;
 	u16 entry;	 /* MCAM entry to read */

drivers/net/ethernet/marvell/octeontx2/af/rvu_npc_fs.c

@@ -1192,7 +1192,7 @@ static int npc_install_flow(struct rvu *rvu, int blkaddr, u16 target,
 	write_req.enable_entry = (u8)enable;
 	/* if counter is available then clear and use it */
 	if (req->set_cntr && rule->has_cntr) {
-		rvu_write64(rvu, blkaddr, NPC_AF_MATCH_STATX(rule->cntr), 0x00);
+		rvu_write64(rvu, blkaddr, NPC_AF_MATCH_STATX(rule->cntr), req->cntr_val);
 		write_req.set_cntr = 1;
 		write_req.cntr = rule->cntr;
 	}
@@ -1407,12 +1407,13 @@ static int npc_delete_flow(struct rvu *rvu, struct rvu_npc_mcam_rule *rule,
 
 int rvu_mbox_handler_npc_delete_flow(struct rvu *rvu,
 				     struct npc_delete_flow_req *req,
-				     struct msg_rsp *rsp)
+				     struct npc_delete_flow_rsp *rsp)
 {
 	struct npc_mcam *mcam = &rvu->hw->mcam;
 	struct rvu_npc_mcam_rule *iter, *tmp;
 	u16 pcifunc = req->hdr.pcifunc;
 	struct list_head del_list;
+	int blkaddr;
 
 	INIT_LIST_HEAD(&del_list);
 
@@ -1428,6 +1429,10 @@ int rvu_mbox_handler_npc_delete_flow(struct rvu *rvu,
 				list_move_tail(&iter->list, &del_list);
 			/* single rule */
 			} else if (req->entry == iter->entry) {
+				blkaddr = rvu_get_blkaddr(rvu, BLKTYPE_NPC, 0);
+				if (blkaddr)
+					rsp->cntr_val = rvu_read64(rvu, blkaddr,
+								   NPC_AF_MATCH_STATX(iter->cntr));
 				list_move_tail(&iter->list, &del_list);
 				break;
 			}

drivers/net/ethernet/marvell/octeontx2/af/rvu_switch.c

@@ -158,6 +158,7 @@ void rvu_switch_enable(struct rvu *rvu)
 	struct npc_mcam_alloc_entry_req alloc_req = { 0 };
 	struct npc_mcam_alloc_entry_rsp alloc_rsp = { 0 };
 	struct npc_delete_flow_req uninstall_req = { 0 };
+	struct npc_delete_flow_rsp uninstall_rsp = { 0 };
 	struct npc_mcam_free_entry_req free_req = { 0 };
 	struct rvu_switch *rswitch = &rvu->rswitch;
 	struct msg_rsp rsp;
@@ -197,7 +198,7 @@ void rvu_switch_enable(struct rvu *rvu)
 uninstall_rules:
 	uninstall_req.start = rswitch->start_entry;
 	uninstall_req.end =  rswitch->start_entry + rswitch->used_entries - 1;
-	rvu_mbox_handler_npc_delete_flow(rvu, &uninstall_req, &rsp);
+	rvu_mbox_handler_npc_delete_flow(rvu, &uninstall_req, &uninstall_rsp);
 	kfree(rswitch->entry2pcifunc);
 free_entries:
 	free_req.all = 1;
@@ -209,6 +210,7 @@ void rvu_switch_enable(struct rvu *rvu)
 void rvu_switch_disable(struct rvu *rvu)
 {
 	struct npc_delete_flow_req uninstall_req = { 0 };
+	struct npc_delete_flow_rsp uninstall_rsp = { 0 };
 	struct npc_mcam_free_entry_req free_req = { 0 };
 	struct rvu_switch *rswitch = &rvu->rswitch;
 	struct rvu_hwinfo *hw = rvu->hw;
@@ -250,7 +252,7 @@ void rvu_switch_disable(struct rvu *rvu)
 	uninstall_req.start = rswitch->start_entry;
 	uninstall_req.end =  rswitch->start_entry + rswitch->used_entries - 1;
 	free_req.all = 1;
-	rvu_mbox_handler_npc_delete_flow(rvu, &uninstall_req, &rsp);
+	rvu_mbox_handler_npc_delete_flow(rvu, &uninstall_req, &uninstall_rsp);
 	rvu_mbox_handler_npc_mcam_free_entry(rvu, &free_req, &rsp);
 	rswitch->used_entries = 0;
 	kfree(rswitch->entry2pcifunc);

drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.h

@@ -361,13 +361,8 @@ struct otx2_flow_config {
 	struct list_head	flow_list;
 	u32			dmacflt_max_flows;
 	u16                     max_flows;
-};
-
-struct otx2_tc_info {
-	/* hash table to store TC offloaded flows */
-	struct rhashtable		flow_table;
-	struct rhashtable_params	flow_ht_params;
-	unsigned long			*tc_entries_bitmap;
+	struct list_head	flow_list_tc;
+	bool			ntuple;
 };
 
 struct dev_hw_ops {
@@ -492,7 +487,6 @@ struct otx2_nic {
 	/* NPC MCAM */
 	struct otx2_flow_config	*flow_cfg;
 	struct otx2_mac_table	*mac_table;
-	struct otx2_tc_info	tc_info;
 
 	u64			reset_count;
 	struct work_struct	reset_task;
@@ -1064,7 +1058,6 @@ int otx2_init_tc(struct otx2_nic *nic);
 void otx2_shutdown_tc(struct otx2_nic *nic);
 int otx2_setup_tc(struct net_device *netdev, enum tc_setup_type type,
 		  void *type_data);
-int otx2_tc_alloc_ent_bitmap(struct otx2_nic *nic);
 /* CGX/RPM DMAC filters support */
 int otx2_dmacflt_get_max_cnt(struct otx2_nic *pf);
 int otx2_dmacflt_add(struct otx2_nic *pf, const u8 *mac, u32 bit_pos);

drivers/net/ethernet/marvell/octeontx2/nic/otx2_devlink.c

@@ -41,7 +41,6 @@ static int otx2_dl_mcam_count_set(struct devlink *devlink, u32 id,
 		return 0;
 
 	otx2_alloc_mcam_entries(pfvf, ctx->val.vu16);
-	otx2_tc_alloc_ent_bitmap(pfvf);
 
 	return 0;
 }

drivers/net/ethernet/marvell/octeontx2/nic/otx2_ethtool.c

@@ -764,6 +764,7 @@ static int otx2_set_rxnfc(struct net_device *dev, struct ethtool_rxnfc *nfc)
 	struct otx2_nic *pfvf = netdev_priv(dev);
 	int ret = -EOPNOTSUPP;
 
+	pfvf->flow_cfg->ntuple = ntuple;
 	switch (nfc->cmd) {
 	case ETHTOOL_SRXFH:
 		ret = otx2_set_rss_hash_opts(pfvf, nfc);

drivers/net/ethernet/marvell/octeontx2/nic/otx2_flows.c

@@ -276,6 +276,7 @@ int otx2vf_mcam_flow_init(struct otx2_nic *pfvf)
 
 	flow_cfg = pfvf->flow_cfg;
 	INIT_LIST_HEAD(&flow_cfg->flow_list);
+	INIT_LIST_HEAD(&flow_cfg->flow_list_tc);
 	flow_cfg->max_flows = 0;
 
 	return 0;
@@ -298,6 +299,7 @@ int otx2_mcam_flow_init(struct otx2_nic *pf)
 		return -ENOMEM;
 
 	INIT_LIST_HEAD(&pf->flow_cfg->flow_list);
+	INIT_LIST_HEAD(&pf->flow_cfg->flow_list_tc);
 
 	/* Allocate bare minimum number of MCAM entries needed for
 	 * unicast and ntuple filters.