octeontx2-af: Support to enable/disable default MCAM entries

For a PF/VF with a NIXLF attached has default/reserved MCAM entries
for receiving Ucast/Bcast/Promisc traffic. Ideally traffic should be
forwarded to NIXLF only after it's contexts are initialized. This
patch keeps these default entries disabled and adds mbox messages
for a PF/VF to enable these once NPA/NIXLF initialization is done.
Likewise while PF/VF is being teared down, it can send the disable
mailbox message to stop receiving traffic.
Signed-off-by: Sunil Goutham <sgoutham@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -195,7 +195,9 @@ M(NIX_RSS_FLOWKEY_CFG,  0x8009, nix_rss_flowkey_cfg,			\
 				 nix_rss_flowkey_cfg, msg_rsp)		\
 M(NIX_SET_MAC_ADDR,	0x800a, nix_set_mac_addr, nix_set_mac_addr, msg_rsp) \
 M(NIX_SET_RX_MODE,	0x800b, nix_set_rx_mode, nix_rx_mode, msg_rsp)	\
-M(NIX_SET_HW_FRS,	0x800c, nix_set_hw_frs, nix_frs_cfg, msg_rsp)
+M(NIX_SET_HW_FRS,	0x800c, nix_set_hw_frs, nix_frs_cfg, msg_rsp)	\
+M(NIX_LF_START_RX,	0x800d, nix_lf_start_rx, msg_req, msg_rsp)	\
+M(NIX_LF_STOP_RX,	0x800e, nix_lf_stop_rx, msg_req, msg_rsp)
 
 /* Messages initiated by AF (range 0xC00 - 0xDFF) */
 #define MBOX_UP_CGX_MESSAGES						\

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

@@ -366,6 +366,10 @@ int rvu_mbox_handler_nix_set_rx_mode(struct rvu *rvu, struct nix_rx_mode *req,
 				     struct msg_rsp *rsp);
 int rvu_mbox_handler_nix_set_hw_frs(struct rvu *rvu, struct nix_frs_cfg *req,
 				    struct msg_rsp *rsp);
+int rvu_mbox_handler_nix_lf_start_rx(struct rvu *rvu, struct msg_req *req,
+				     struct msg_rsp *rsp);
+int rvu_mbox_handler_nix_lf_stop_rx(struct rvu *rvu, struct msg_req *req,
+				    struct msg_rsp *rsp);
 
 /* NPC APIs */
 int rvu_npc_init(struct rvu *rvu);
@@ -377,9 +381,12 @@ void rvu_npc_install_ucast_entry(struct rvu *rvu, u16 pcifunc,
 void rvu_npc_install_promisc_entry(struct rvu *rvu, u16 pcifunc,
 				   int nixlf, u64 chan, bool allmulti);
 void rvu_npc_disable_promisc_entry(struct rvu *rvu, u16 pcifunc, int nixlf);
+void rvu_npc_enable_promisc_entry(struct rvu *rvu, u16 pcifunc, int nixlf);
 void rvu_npc_install_bcast_match_entry(struct rvu *rvu, u16 pcifunc,
 				       int nixlf, u64 chan);
 void rvu_npc_disable_mcam_entries(struct rvu *rvu, u16 pcifunc, int nixlf);
+void rvu_npc_disable_default_entries(struct rvu *rvu, u16 pcifunc, int nixlf);
+void rvu_npc_enable_default_entries(struct rvu *rvu, u16 pcifunc, int nixlf);
 void rvu_npc_update_flowkey_alg_idx(struct rvu *rvu, u16 pcifunc, int nixlf,
 				    int group, int alg_idx, int mcam_index);
 int rvu_mbox_handler_npc_mcam_alloc_entry(struct rvu *rvu,

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

@@ -821,6 +821,9 @@ int rvu_mbox_handler_nix_lf_alloc(struct rvu *rvu,
 	if (err)
 		goto free_mem;
 
+	/* Disable NPC entries as NIXLF's contexts are not initialized yet */
+	rvu_npc_disable_default_entries(rvu, pcifunc, nixlf);
+
 	goto exit;
 
 free_mem:
@@ -2176,3 +2179,48 @@ void rvu_nix_freemem(struct rvu *rvu)
 		mutex_destroy(&mcast->mce_lock);
 	}
 }
+
+static int nix_get_nixlf(struct rvu *rvu, u16 pcifunc, int *nixlf)
+{
+	struct rvu_pfvf *pfvf = rvu_get_pfvf(rvu, pcifunc);
+	struct rvu_hwinfo *hw = rvu->hw;
+	int blkaddr;
+
+	blkaddr = rvu_get_blkaddr(rvu, BLKTYPE_NIX, pcifunc);
+	if (!pfvf->nixlf || blkaddr < 0)
+		return NIX_AF_ERR_AF_LF_INVALID;
+
+	*nixlf = rvu_get_lf(rvu, &hw->block[blkaddr], pcifunc, 0);
+	if (*nixlf < 0)
+		return NIX_AF_ERR_AF_LF_INVALID;
+
+	return 0;
+}
+
+int rvu_mbox_handler_nix_lf_start_rx(struct rvu *rvu, struct msg_req *req,
+				     struct msg_rsp *rsp)
+{
+	u16 pcifunc = req->hdr.pcifunc;
+	int nixlf, err;
+
+	err = nix_get_nixlf(rvu, pcifunc, &nixlf);
+	if (err)
+		return err;
+
+	rvu_npc_enable_default_entries(rvu, pcifunc, nixlf);
+	return 0;
+}
+
+int rvu_mbox_handler_nix_lf_stop_rx(struct rvu *rvu, struct msg_req *req,
+				    struct msg_rsp *rsp)
+{
+	u16 pcifunc = req->hdr.pcifunc;
+	int nixlf, err;
+
+	err = nix_get_nixlf(rvu, pcifunc, &nixlf);
+	if (err)
+		return err;
+
+	rvu_npc_disable_default_entries(rvu, pcifunc, nixlf);
+	return 0;
+}

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

@@ -384,7 +384,8 @@ void rvu_npc_install_promisc_entry(struct rvu *rvu, u16 pcifunc,
 			      NIX_INTF_RX, &entry, true);
 }
 
-void rvu_npc_disable_promisc_entry(struct rvu *rvu, u16 pcifunc, int nixlf)
+static void npc_enadis_promisc_entry(struct rvu *rvu, u16 pcifunc,
+				     int nixlf, bool enable)
 {
 	struct npc_mcam *mcam = &rvu->hw->mcam;
 	int blkaddr, index;
@@ -399,7 +400,17 @@ void rvu_npc_disable_promisc_entry(struct rvu *rvu, u16 pcifunc, int nixlf)
 
 	index = npc_get_nixlf_mcam_index(mcam, pcifunc,
 					 nixlf, NIXLF_PROMISC_ENTRY);
-	npc_enable_mcam_entry(rvu, mcam, blkaddr, index, false);
+	npc_enable_mcam_entry(rvu, mcam, blkaddr, index, enable);
+}
+
+void rvu_npc_disable_promisc_entry(struct rvu *rvu, u16 pcifunc, int nixlf)
+{
+	npc_enadis_promisc_entry(rvu, pcifunc, nixlf, false);
+}
+
+void rvu_npc_enable_promisc_entry(struct rvu *rvu, u16 pcifunc, int nixlf)
+{
+	npc_enadis_promisc_entry(rvu, pcifunc, nixlf, true);
 }
 
 void rvu_npc_install_bcast_match_entry(struct rvu *rvu, u16 pcifunc,
@@ -512,49 +523,75 @@ void rvu_npc_update_flowkey_alg_idx(struct rvu *rvu, u16 pcifunc, int nixlf,
 		    NPC_AF_MCAMEX_BANKX_ACTION(index, bank), *(u64 *)&action);
 }
 
-void rvu_npc_disable_mcam_entries(struct rvu *rvu, u16 pcifunc, int nixlf)
+static void npc_enadis_default_entries(struct rvu *rvu, u16 pcifunc,
+				       int nixlf, bool enable)
 {
 	struct npc_mcam *mcam = &rvu->hw->mcam;
 	struct nix_rx_action action;
-	int blkaddr, index, bank;
+	int index, bank, blkaddr;
 
 	blkaddr = rvu_get_blkaddr(rvu, BLKTYPE_NPC, 0);
 	if (blkaddr < 0)
 		return;
 
-	mutex_lock(&mcam->lock);
-
-	/* Disable and free all MCAM entries mapped to this 'pcifunc' */
-	npc_mcam_free_all_entries(rvu, mcam, blkaddr, pcifunc);
-
-	/* Free all MCAM counters mapped to this 'pcifunc' */
-	npc_mcam_free_all_counters(rvu, mcam, pcifunc);
-
-	mutex_unlock(&mcam->lock);
-
-	/* Disable ucast MCAM match entry of this PF/VF */
+	/* Ucast MCAM match entry of this PF/VF */
 	index = npc_get_nixlf_mcam_index(mcam, pcifunc,
 					 nixlf, NIXLF_UCAST_ENTRY);
-	npc_enable_mcam_entry(rvu, mcam, blkaddr, index, false);
+	npc_enable_mcam_entry(rvu, mcam, blkaddr, index, enable);
 
-	/* For PF, disable promisc and bcast MCAM match entries */
-	if (!(pcifunc & RVU_PFVF_FUNC_MASK)) {
-		index = npc_get_nixlf_mcam_index(mcam, pcifunc,
-						 nixlf, NIXLF_BCAST_ENTRY);
-		/* For bcast, disable only if it's action is not
+	/* For PF, ena/dis promisc and bcast MCAM match entries */
+	if (pcifunc & RVU_PFVF_FUNC_MASK)
+		return;
+
+	/* For bcast, enable/disable only if it's action is not
 	 * packet replication, incase if action is replication
 	 * then this PF's nixlf is removed from bcast replication
 	 * list.
 	 */
+	index = npc_get_nixlf_mcam_index(mcam, pcifunc,
+					 nixlf, NIXLF_BCAST_ENTRY);
 	bank = npc_get_bank(mcam, index);
-		index &= (mcam->banksize - 1);
 	*(u64 *)&action = rvu_read64(rvu, blkaddr,
-				     NPC_AF_MCAMEX_BANKX_ACTION(index, bank));
+	     NPC_AF_MCAMEX_BANKX_ACTION(index & (mcam->banksize - 1), bank));
 	if (action.op != NIX_RX_ACTIONOP_MCAST)
-			npc_enable_mcam_entry(rvu, mcam, blkaddr, index, false);
-
+		npc_enable_mcam_entry(rvu, mcam,
+				      blkaddr, index, enable);
+	if (enable)
+		rvu_npc_enable_promisc_entry(rvu, pcifunc, nixlf);
+	else
 		rvu_npc_disable_promisc_entry(rvu, pcifunc, nixlf);
-	}
+}
+
+void rvu_npc_disable_default_entries(struct rvu *rvu, u16 pcifunc, int nixlf)
+{
+	npc_enadis_default_entries(rvu, pcifunc, nixlf, false);
+}
+
+void rvu_npc_enable_default_entries(struct rvu *rvu, u16 pcifunc, int nixlf)
+{
+	npc_enadis_default_entries(rvu, pcifunc, nixlf, true);
+}
+
+void rvu_npc_disable_mcam_entries(struct rvu *rvu, u16 pcifunc, int nixlf)
+{
+	struct npc_mcam *mcam = &rvu->hw->mcam;
+	int blkaddr;
+
+	blkaddr = rvu_get_blkaddr(rvu, BLKTYPE_NPC, 0);
+	if (blkaddr < 0)
+		return;
+
+	mutex_lock(&mcam->lock);
+
+	/* Disable and free all MCAM entries mapped to this 'pcifunc' */
+	npc_mcam_free_all_entries(rvu, mcam, blkaddr, pcifunc);
+
+	/* Free all MCAM counters mapped to this 'pcifunc' */
+	npc_mcam_free_all_counters(rvu, mcam, pcifunc);
+
+	mutex_unlock(&mcam->lock);
+
+	rvu_npc_disable_default_entries(rvu, pcifunc, nixlf);
 }
 
 #define SET_KEX_LD(intf, lid, ltype, ld, cfg)	\