octeontx2-af: Configure AF VFs to talk over LBK channels

Configure AF VFs such that they are able to talk over consecutive
loopback channels.

If 8 VFs are attached to AF then communication will work as below:

TX      RX
lbk0 -> lbk1
lbk1 -> lbk0

lbk2 -> lbk3
lbk3 -> lbk2

lbk4 -> lbk5
lbk5 -> lbk4

lbk6 -> lbk7
lbk7 -> lbk6
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/common.h

@@ -174,7 +174,9 @@ enum nix_scheduler {
 
 #define MAX_LMAC_PKIND			12
 #define NIX_LINK_CGX_LMAC(a, b)		(0 + 4 * (a) + (b))
+#define NIX_LINK_LBK(a)			(12 + (a))
 #define NIX_CHAN_CGX_LMAC_CHX(a, b, c)	(0x800 + 0x100 * (a) + 0x10 * (b) + (c))
+#define NIX_CHAN_LBK_CHX(a, b)		(0 + 0x100 * (a) + (b))
 
 /* NIX LSO format indices.
  * As of now TSO is the only one using, so statically assigning indices.

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

@@ -258,6 +258,11 @@ static inline u64 rvupf_read64(struct rvu *rvu, u64 offset)
 /* Function Prototypes
  * RVU
  */
+static inline int is_afvf(u16 pcifunc)
+{
+	return !(pcifunc & ~RVU_PFVF_FUNC_MASK);
+}
+
 int rvu_alloc_bitmap(struct rsrc_bmap *rsrc);
 int rvu_alloc_rsrc(struct rsrc_bmap *rsrc);
 void rvu_free_rsrc(struct rsrc_bmap *rsrc, int id);

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

@@ -144,7 +144,7 @@ static int nix_interface_init(struct rvu *rvu, u16 pcifunc, int type, int nixlf)
 {
 	struct rvu_pfvf *pfvf = rvu_get_pfvf(rvu, pcifunc);
 	u8 cgx_id, lmac_id;
-	int pkind, pf;
+	int pkind, pf, vf;
 	int err;
 
 	pf = rvu_get_pf(pcifunc);
@@ -170,6 +170,14 @@ static int nix_interface_init(struct rvu *rvu, u16 pcifunc, int type, int nixlf)
 		rvu_npc_set_pkind(rvu, pkind, pfvf);
 		break;
 	case NIX_INTF_TYPE_LBK:
+		vf = (pcifunc & RVU_PFVF_FUNC_MASK) - 1;
+		pfvf->rx_chan_base = NIX_CHAN_LBK_CHX(0, vf);
+		pfvf->tx_chan_base = vf & 0x1 ? NIX_CHAN_LBK_CHX(0, vf - 1) :
+						NIX_CHAN_LBK_CHX(0, vf + 1);
+		pfvf->rx_chan_cnt = 1;
+		pfvf->tx_chan_cnt = 1;
+		rvu_npc_install_promisc_entry(rvu, pcifunc, nixlf,
+					      pfvf->rx_chan_base, false);
 		break;
 	}
 
@@ -684,7 +692,7 @@ int rvu_mbox_handler_nix_lf_alloc(struct rvu *rvu,
 				  struct nix_lf_alloc_req *req,
 				  struct nix_lf_alloc_rsp *rsp)
 {
-	int nixlf, qints, hwctx_size, err, rc = 0;
+	int nixlf, qints, hwctx_size, intf, err, rc = 0;
 	struct rvu_hwinfo *hw = rvu->hw;
 	u16 pcifunc = req->hdr.pcifunc;
 	struct rvu_block *block;
@@ -839,7 +847,8 @@ int rvu_mbox_handler_nix_lf_alloc(struct rvu *rvu,
 	/* Config Rx pkt length, csum checks and apad  enable / disable */
 	rvu_write64(rvu, blkaddr, NIX_AF_LFX_RX_CFG(nixlf), req->rx_cfg);
 
-	err = nix_interface_init(rvu, pcifunc, NIX_INTF_TYPE_CGX, nixlf);
+	intf = is_afvf(pcifunc) ? NIX_INTF_TYPE_LBK : NIX_INTF_TYPE_CGX;
+	err = nix_interface_init(rvu, pcifunc, intf, nixlf);
 	if (err)
 		goto free_mem;
 
@@ -1354,6 +1363,10 @@ static int nix_update_bcast_mce_list(struct rvu *rvu, u16 pcifunc, bool add)
 	struct rvu_pfvf *pfvf;
 	int blkaddr;
 
+	/* Broadcast pkt replication is not needed for AF's VFs, hence skip */
+	if (is_afvf(pcifunc))
+		return 0;
+
 	blkaddr = rvu_get_blkaddr(rvu, BLKTYPE_NIX, pcifunc);
 	if (blkaddr < 0)
 		return 0;
@@ -1966,6 +1979,12 @@ int rvu_mbox_handler_nix_rxvlan_alloc(struct rvu *rvu, struct msg_req *req,
 	int blkaddr, nixlf, err;
 	struct rvu_pfvf *pfvf;
 
+	/* LBK VFs do not have separate MCAM UCAST entry hence
+	 * skip allocating rxvlan for them
+	 */
+	if (is_afvf(pcifunc))
+		return 0;
+
 	pfvf = rvu_get_pfvf(rvu, pcifunc);
 	if (pfvf->rxvlan)
 		return 0;

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

@@ -314,6 +314,10 @@ void rvu_npc_install_ucast_entry(struct rvu *rvu, u16 pcifunc,
 	int blkaddr, index, kwi;
 	u64 mac = 0;
 
+	/* AF's VFs work in promiscuous mode */
+	if (is_afvf(pcifunc))
+		return;
+
 	blkaddr = rvu_get_blkaddr(rvu, BLKTYPE_NPC, 0);
 	if (blkaddr < 0)
 		return;
@@ -368,12 +372,12 @@ void rvu_npc_install_promisc_entry(struct rvu *rvu, u16 pcifunc,
 	struct nix_rx_action action = { };
 	int blkaddr, index, kwi;
 
-	blkaddr = rvu_get_blkaddr(rvu, BLKTYPE_NPC, 0);
-	if (blkaddr < 0)
+	/* Only PF or AF VF can add a promiscuous entry */
+	if ((pcifunc & RVU_PFVF_FUNC_MASK) && !is_afvf(pcifunc))
 		return;
 
-	/* Only PF or AF VF can add a promiscuous entry */
-	if (pcifunc & RVU_PFVF_FUNC_MASK)
+	blkaddr = rvu_get_blkaddr(rvu, BLKTYPE_NPC, 0);
+	if (blkaddr < 0)
 		return;
 
 	index = npc_get_nixlf_mcam_index(mcam, pcifunc,