octeontx2-af: Add support for stripping STAG/CTAG

This works by shadowing existing UCAST MCAM entry
with a new one additionally matching either NPC_LT_LB_CTAG
or NPC_LT_LB_STAG. For this to fully work one needs to
send properly configured NIX_VTAG_CFG message afterwards i.e with
strip and capture enabled and type set to 0.

On receiving tagged packet NIX will remove outer VLAN and capture
TCI in NIX_RX_PARSE_S.

Also simplified RX Vtag configuration flow
With this setting STRIP/CAPTURE VTAG actions separately would be
possible. Following combinations are possible: STRIP,
STRIP and CAPTURE, CAPTURE or nothing (0 disables respective actions).
Signed-off-by: Tomasz Duszynski <tduszynski@marvell.com>
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

@@ -197,7 +197,8 @@ 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_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)
+M(NIX_LF_STOP_RX,	0x800e, nix_lf_stop_rx, msg_req, msg_rsp)	\
+M(NIX_RXVLAN_ALLOC,	0x8012, nix_rxvlan_alloc, msg_req, msg_rsp)
 
 /* Messages initiated by AF (range 0xC00 - 0xDFF) */
 #define MBOX_UP_CGX_MESSAGES						\
@@ -515,6 +516,7 @@ struct nix_txschq_config {
 
 struct nix_vtag_config {
 	struct mbox_msghdr hdr;
+	/* '0' for 4 octet VTAG, '1' for 8 octet VTAG */
 	u8 vtag_size;
 	/* cfg_type is '0' for tx vlan cfg
 	 * cfg_type is '1' for rx vlan cfg
@@ -535,7 +537,7 @@ struct nix_vtag_config {
 
 		/* valid when cfg_type is '1' */
 		struct {
-			/* rx vtag type index */
+			/* rx vtag type index, valid values are in 0..7 range */
 			u8 vtag_type;
 			/* rx vtag strip */
 			u8 strip_vtag :1;

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

@@ -259,4 +259,10 @@ struct nix_rx_action {
 #endif
 };
 
+/* NIX Receive Vtag Action Structure */
+#define VTAG0_VALID_BIT		BIT_ULL(15)
+#define VTAG0_TYPE_MASK		GENMASK_ULL(14, 12)
+#define VTAG0_LID_MASK		GENMASK_ULL(10, 8)
+#define VTAG0_RELPTR_MASK	GENMASK_ULL(7, 0)
+
 #endif /* NPC_H */

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

@@ -142,6 +142,11 @@ struct rvu_pfvf {
 	/* Broadcast pkt replication info */
 	u16			bcast_mce_idx;
 	struct nix_mce_list	bcast_mce_list;
+
+	/* VLAN offload */
+	struct mcam_entry entry;
+	int rxvlan_index;
+	bool rxvlan;
 };
 
 struct nix_txsch {
@@ -356,6 +361,8 @@ int rvu_mbox_handler_nix_stats_rst(struct rvu *rvu, struct msg_req *req,
 int rvu_mbox_handler_nix_vtag_cfg(struct rvu *rvu,
 				  struct nix_vtag_config *req,
 				  struct msg_rsp *rsp);
+int rvu_mbox_handler_nix_rxvlan_alloc(struct rvu *rvu, struct msg_req *req,
+				      struct msg_rsp *rsp);
 int rvu_mbox_handler_nix_rss_flowkey_cfg(struct rvu *rvu,
 					 struct nix_rss_flowkey_cfg *req,
 					 struct msg_rsp *rsp);
@@ -384,6 +391,7 @@ 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);
+int rvu_npc_update_rxvlan(struct rvu *rvu, u16 pcifunc, int nixlf);
 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);

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

@@ -192,6 +192,7 @@ static void nix_interface_deinit(struct rvu *rvu, u16 pcifunc, u8 nixlf)
 
 	pfvf->maxlen = 0;
 	pfvf->minlen = 0;
+	pfvf->rxvlan = false;
 
 	/* Remove this PF_FUNC from bcast pkt replication list */
 	err = nix_update_bcast_mce_list(rvu, pcifunc, false);
@@ -1209,28 +1210,15 @@ int rvu_mbox_handler_nix_txschq_cfg(struct rvu *rvu,
 static int nix_rx_vtag_cfg(struct rvu *rvu, int nixlf, int blkaddr,
 			   struct nix_vtag_config *req)
 {
-	u64 regval = 0;
+	u64 regval = req->vtag_size;
 
-#define NIX_VTAGTYPE_MAX 0x8ull
-#define NIX_VTAGSIZE_MASK 0x7ull
-#define NIX_VTAGSTRIP_CAP_MASK 0x30ull
-
-	if (req->rx.vtag_type >= NIX_VTAGTYPE_MAX ||
-	    req->vtag_size > VTAGSIZE_T8)
+	if (req->rx.vtag_type > 7 || req->vtag_size > VTAGSIZE_T8)
 		return -EINVAL;
 
-	regval = rvu_read64(rvu, blkaddr,
-			    NIX_AF_LFX_RX_VTAG_TYPEX(nixlf, req->rx.vtag_type));
-
-	if (req->rx.strip_vtag && req->rx.capture_vtag)
-		regval |= BIT_ULL(4) | BIT_ULL(5);
-	else if (req->rx.strip_vtag)
+	if (req->rx.capture_vtag)
+		regval |= BIT_ULL(5);
+	if (req->rx.strip_vtag)
 		regval |= BIT_ULL(4);
-	else
-		regval &= ~(BIT_ULL(4) | BIT_ULL(5));
-
-	regval &= ~NIX_VTAGSIZE_MASK;
-	regval |= req->vtag_size & NIX_VTAGSIZE_MASK;
 
 	rvu_write64(rvu, blkaddr,
 		    NIX_AF_LFX_RX_VTAG_TYPEX(nixlf, req->rx.vtag_type), regval);
@@ -1770,6 +1758,9 @@ int rvu_mbox_handler_nix_set_mac_addr(struct rvu *rvu,
 
 	rvu_npc_install_ucast_entry(rvu, pcifunc, nixlf,
 				    pfvf->rx_chan_base, req->mac_addr);
+
+	rvu_npc_update_rxvlan(rvu, pcifunc, nixlf);
+
 	return 0;
 }
 
@@ -1803,6 +1794,9 @@ int rvu_mbox_handler_nix_set_rx_mode(struct rvu *rvu, struct nix_rx_mode *req,
 	else
 		rvu_npc_install_promisc_entry(rvu, pcifunc, nixlf,
 					      pfvf->rx_chan_base, allmulti);
+
+	rvu_npc_update_rxvlan(rvu, pcifunc, nixlf);
+
 	return 0;
 }
 
@@ -1941,6 +1935,59 @@ int rvu_mbox_handler_nix_set_hw_frs(struct rvu *rvu, struct nix_frs_cfg *req,
 	return 0;
 }
 
+int rvu_mbox_handler_nix_rxvlan_alloc(struct rvu *rvu, struct msg_req *req,
+				      struct msg_rsp *rsp)
+{
+	struct npc_mcam_alloc_entry_req alloc_req = { };
+	struct npc_mcam_alloc_entry_rsp alloc_rsp = { };
+	struct npc_mcam_free_entry_req free_req = { };
+	u16 pcifunc = req->hdr.pcifunc;
+	int blkaddr, nixlf, err;
+	struct rvu_pfvf *pfvf;
+
+	pfvf = rvu_get_pfvf(rvu, pcifunc);
+	if (pfvf->rxvlan)
+		return 0;
+
+	/* alloc new mcam entry */
+	alloc_req.hdr.pcifunc = pcifunc;
+	alloc_req.count = 1;
+
+	err = rvu_mbox_handler_npc_mcam_alloc_entry(rvu, &alloc_req,
+						    &alloc_rsp);
+	if (err)
+		return err;
+
+	/* update entry to enable rxvlan offload */
+	blkaddr = rvu_get_blkaddr(rvu, BLKTYPE_NIX, pcifunc);
+	if (blkaddr < 0) {
+		err = NIX_AF_ERR_AF_LF_INVALID;
+		goto free_entry;
+	}
+
+	nixlf = rvu_get_lf(rvu, &rvu->hw->block[blkaddr], pcifunc, 0);
+	if (nixlf < 0) {
+		err = NIX_AF_ERR_AF_LF_INVALID;
+		goto free_entry;
+	}
+
+	pfvf->rxvlan_index = alloc_rsp.entry_list[0];
+	/* all it means is that rxvlan_index is valid */
+	pfvf->rxvlan = true;
+
+	err = rvu_npc_update_rxvlan(rvu, pcifunc, nixlf);
+	if (err)
+		goto free_entry;
+
+	return 0;
+free_entry:
+	free_req.hdr.pcifunc = pcifunc;
+	free_req.entry = alloc_rsp.entry_list[0];
+	rvu_mbox_handler_npc_mcam_free_entry(rvu, &free_req, rsp);
+	pfvf->rxvlan = false;
+	return err;
+}
+
 static void nix_link_config(struct rvu *rvu, int blkaddr)
 {
 	struct rvu_hwinfo *hw = rvu->hw;

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

@@ -8,6 +8,7 @@
  * published by the Free Software Foundation.
  */
 
+#include <linux/bitfield.h>
 #include <linux/module.h>
 #include <linux/pci.h>
 
@@ -306,6 +307,7 @@ static u64 npc_get_mcam_action(struct rvu *rvu, struct npc_mcam *mcam,
 void rvu_npc_install_ucast_entry(struct rvu *rvu, u16 pcifunc,
 				 int nixlf, u64 chan, u8 *mac_addr)
 {
+	struct rvu_pfvf *pfvf = rvu_get_pfvf(rvu, pcifunc);
 	struct npc_mcam *mcam = &rvu->hw->mcam;
 	struct mcam_entry entry = { {0} };
 	struct nix_rx_action action;
@@ -345,6 +347,17 @@ void rvu_npc_install_ucast_entry(struct rvu *rvu, u16 pcifunc,
 	entry.action = *(u64 *)&action;
 	npc_config_mcam_entry(rvu, mcam, blkaddr, index,
 			      NIX_INTF_RX, &entry, true);
+
+	/* add VLAN matching, setup action and save entry back for later */
+	entry.kw[0] |= (NPC_LT_LB_STAG | NPC_LT_LB_CTAG) << 20;
+	entry.kw_mask[0] |= (NPC_LT_LB_STAG & NPC_LT_LB_CTAG) << 20;
+
+	entry.vtag_action = VTAG0_VALID_BIT |
+			    FIELD_PREP(VTAG0_TYPE_MASK, 0) |
+			    FIELD_PREP(VTAG0_LID_MASK, NPC_LID_LA) |
+			    FIELD_PREP(VTAG0_RELPTR_MASK, 12);
+
+	memcpy(&pfvf->entry, &entry, sizeof(entry));
 }
 
 void rvu_npc_install_promisc_entry(struct rvu *rvu, u16 pcifunc,
@@ -352,7 +365,7 @@ void rvu_npc_install_promisc_entry(struct rvu *rvu, u16 pcifunc,
 {
 	struct npc_mcam *mcam = &rvu->hw->mcam;
 	struct mcam_entry entry = { {0} };
-	struct nix_rx_action action;
+	struct nix_rx_action action = { };
 	int blkaddr, index, kwi;
 
 	blkaddr = rvu_get_blkaddr(rvu, BLKTYPE_NPC, 0);
@@ -521,6 +534,8 @@ void rvu_npc_update_flowkey_alg_idx(struct rvu *rvu, u16 pcifunc, int nixlf,
 
 	rvu_write64(rvu, blkaddr,
 		    NPC_AF_MCAMEX_BANKX_ACTION(index, bank), *(u64 *)&action);
+
+	rvu_npc_update_rxvlan(rvu, pcifunc, nixlf);
 }
 
 static void npc_enadis_default_entries(struct rvu *rvu, u16 pcifunc,
@@ -560,6 +575,8 @@ static void npc_enadis_default_entries(struct rvu *rvu, u16 pcifunc,
 		rvu_npc_enable_promisc_entry(rvu, pcifunc, nixlf);
 	else
 		rvu_npc_disable_promisc_entry(rvu, pcifunc, nixlf);
+
+	rvu_npc_update_rxvlan(rvu, pcifunc, nixlf);
 }
 
 void rvu_npc_disable_default_entries(struct rvu *rvu, u16 pcifunc, int nixlf)
@@ -2018,3 +2035,27 @@ int rvu_mbox_handler_npc_get_kex_cfg(struct rvu *rvu, struct msg_req *req,
 	}
 	return 0;
 }
+
+int rvu_npc_update_rxvlan(struct rvu *rvu, u16 pcifunc, int nixlf)
+{
+	struct rvu_pfvf *pfvf = rvu_get_pfvf(rvu, pcifunc);
+	struct npc_mcam *mcam = &rvu->hw->mcam;
+	int blkaddr, index;
+	bool enable;
+
+	blkaddr = rvu_get_blkaddr(rvu, BLKTYPE_NPC, 0);
+	if (blkaddr < 0)
+		return NIX_AF_ERR_AF_LF_INVALID;
+
+	if (!pfvf->rxvlan)
+		return 0;
+
+	index = npc_get_nixlf_mcam_index(mcam, pcifunc, nixlf,
+					 NIXLF_UCAST_ENTRY);
+	pfvf->entry.action = npc_get_mcam_action(rvu, mcam, blkaddr, index);
+	enable = is_mcam_entry_enabled(rvu, mcam, blkaddr, index);
+	npc_config_mcam_entry(rvu, mcam, blkaddr, pfvf->rxvlan_index,
+			      NIX_INTF_RX, &pfvf->entry, enable);
+
+	return 0;
+}