octeontx2-af: Enable LBK links only when switch mode is on.

Currently, all the TL3_TL2 nodes are being configured to enable
switch LBK channel 63 in them. Instead enable them only when switch
mode is enabled.
Signed-off-by: Subbaraya Sundeep <sbhatta@marvell.com>
Signed-off-by: Naveen Mamindlapalli <naveenm@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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

@@ -806,6 +806,8 @@ int rvu_get_nix_blkaddr(struct rvu *rvu, u16 pcifunc);
 int nix_get_dwrr_mtu_reg(struct rvu_hwinfo *hw, int smq_link_type);
 u32 convert_dwrr_mtu_to_bytes(u8 dwrr_mtu);
 u32 convert_bytes_to_dwrr_mtu(u32 bytes);
+void rvu_nix_tx_tl2_cfg(struct rvu *rvu, int blkaddr, u16 pcifunc,
+			struct nix_txsch *txsch, bool enable);
 
 /* NPC APIs */
 void rvu_npc_freemem(struct rvu *rvu);

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

@@ -2460,17 +2460,19 @@ static int nix_txschq_cfg_read(struct rvu *rvu, struct nix_hw *nix_hw,
 	return 0;
 }
 
-static void rvu_nix_tx_tl2_cfg(struct rvu *rvu, int blkaddr,
-			       u16 pcifunc, struct nix_txsch *txsch)
+void rvu_nix_tx_tl2_cfg(struct rvu *rvu, int blkaddr, u16 pcifunc,
+			struct nix_txsch *txsch, bool enable)
 {
 	struct rvu_hwinfo *hw = rvu->hw;
 	int lbk_link_start, lbk_links;
 	u8 pf = rvu_get_pf(pcifunc);
 	int schq;
+	u64 cfg;
 
 	if (!is_pf_cgxmapped(rvu, pf))
 		return;
 
+	cfg = enable ? (BIT_ULL(12) | RVU_SWITCH_LBK_CHAN) : 0;
 	lbk_link_start = hw->cgx_links;
 
 	for (schq = 0; schq < txsch->schq.max; schq++) {
@@ -2484,8 +2486,7 @@ static void rvu_nix_tx_tl2_cfg(struct rvu *rvu, int blkaddr,
 			rvu_write64(rvu, blkaddr,
 				    NIX_AF_TL3_TL2X_LINKX_CFG(schq,
 							      lbk_link_start +
-							      lbk_links),
-				    BIT_ULL(12) | RVU_SWITCH_LBK_CHAN);
+							      lbk_links), cfg);
 	}
 }
 
@@ -2591,8 +2592,6 @@ int rvu_mbox_handler_nix_txschq_cfg(struct rvu *rvu,
 		rvu_write64(rvu, blkaddr, reg, regval);
 	}
 
-	rvu_nix_tx_tl2_cfg(rvu, blkaddr, pcifunc,
-			   &nix_hw->txsch[NIX_TXSCH_LVL_TL2]);
 	return 0;
 }
 

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

@@ -8,6 +8,17 @@
 #include <linux/bitfield.h>
 #include "rvu.h"
 
+static void rvu_switch_enable_lbk_link(struct rvu *rvu, u16 pcifunc, bool enable)
+{
+	struct rvu_pfvf *pfvf = rvu_get_pfvf(rvu, pcifunc);
+	struct nix_hw *nix_hw;
+
+	nix_hw = get_nix_hw(rvu->hw, pfvf->nix_blkaddr);
+	/* Enable LBK links with channel 63 for TX MCAM rule */
+	rvu_nix_tx_tl2_cfg(rvu, pfvf->nix_blkaddr, pcifunc,
+			   &nix_hw->txsch[NIX_TXSCH_LVL_TL2], enable);
+}
+
 static int rvu_switch_install_rx_rule(struct rvu *rvu, u16 pcifunc,
 				      u16 chan_mask)
 {
@@ -52,6 +63,8 @@ static int rvu_switch_install_tx_rule(struct rvu *rvu, u16 pcifunc, u16 entry)
 	if (!test_bit(NIXLF_INITIALIZED, &pfvf->flags))
 		return 0;
 
+	rvu_switch_enable_lbk_link(rvu, pcifunc, true);
+
 	lbkid = pfvf->nix_blkaddr == BLKADDR_NIX0 ? 0 : 1;
 	ether_addr_copy(req.packet.dmac, pfvf->mac_addr);
 	eth_broadcast_addr((u8 *)&req.mask.dmac);
@@ -218,6 +231,9 @@ void rvu_switch_disable(struct rvu *rvu)
 				"Reverting RX rule for PF%d failed(%d)\n",
 				pf, err);
 
+		/* Disable LBK link */
+		rvu_switch_enable_lbk_link(rvu, pcifunc, false);
+
 		rvu_get_pf_numvfs(rvu, pf, &numvfs, NULL);
 		for (vf = 0; vf < numvfs; vf++) {
 			pcifunc = pf << 10 | ((vf + 1) & 0x3FF);
@@ -226,6 +242,8 @@ void rvu_switch_disable(struct rvu *rvu)
 				dev_err(rvu->dev,
 					"Reverting RX rule for PF%dVF%d failed(%d)\n",
 					pf, vf, err);
+
+			rvu_switch_enable_lbk_link(rvu, pcifunc, false);
 		}
 	}