octeontx2-af: Verify MCAM entry channel and PF_FUNC

This patch adds support to verify the channel number sent by
mailbox requester before writing MCAM entry for Ingress packets.
Similarly for Egress packets, verifying the PF_FUNC sent by the
mailbox user.

Signed-off-by: Subbaraya Sundeep <sbhatta@marvell.com>
Signed-off-by: Kiran Kumar K <kirankumark@marvell.com>
Signed-off-by: Sunil Goutham <sgoutham@marvell.com>
Signed-off-by: Naveen Mamindlapalli <naveenm@marvell.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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

@@ -2642,7 +2642,7 @@ static void rvu_enable_afvf_intr(struct rvu *rvu)
 
 #define PCI_DEVID_OCTEONTX2_LBK 0xA061
 
-static int lbk_get_num_chans(void)
+int rvu_get_num_lbk_chans(void)
 {
 	struct pci_dev *pdev;
 	void __iomem *base;
@@ -2677,7 +2677,7 @@ static int rvu_enable_sriov(struct rvu *rvu)
 		return 0;
 	}
 
-	chans = lbk_get_num_chans();
+	chans = rvu_get_num_lbk_chans();
 	if (chans < 0)
 		return chans;
 

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

@@ -445,6 +445,7 @@ int rvu_get_lf(struct rvu *rvu, struct rvu_block *block, u16 pcifunc, u16 slot);
 int rvu_lf_reset(struct rvu *rvu, struct rvu_block *block, int lf);
 int rvu_get_blkaddr(struct rvu *rvu, int blktype, u16 pcifunc);
 int rvu_poll_reg(struct rvu *rvu, u64 block, u64 offset, u64 mask, bool zero);
+int rvu_get_num_lbk_chans(void);
 
 /* RVU HW reg validation */
 enum regmap_block {
@@ -535,6 +536,7 @@ bool is_npc_intf_tx(u8 intf);
 bool is_npc_intf_rx(u8 intf);
 bool is_npc_interface_valid(struct rvu *rvu, u8 intf);
 int rvu_npc_get_tx_nibble_cfg(struct rvu *rvu, u64 nibble_ena);
+int npc_mcam_verify_channel(struct rvu *rvu, u16 pcifunc, u8 intf, u16 channel);
 
 #ifdef CONFIG_DEBUG_FS
 void rvu_dbg_init(struct rvu *rvu);

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

@@ -28,6 +28,8 @@
 
 #define NPC_PARSE_RESULT_DMAC_OFFSET	8
 #define NPC_HW_TSTAMP_OFFSET		8
+#define NPC_KEX_CHAN_MASK		0xFFFULL
+#define NPC_KEX_PF_FUNC_MASK		0xFFFFULL
 
 static const char def_pfl_name[] = "default";
 
@@ -63,6 +65,54 @@ int rvu_npc_get_tx_nibble_cfg(struct rvu *rvu, u64 nibble_ena)
 	return 0;
 }
 
+static int npc_mcam_verify_pf_func(struct rvu *rvu,
+				   struct mcam_entry *entry_data, u8 intf,
+				   u16 pcifunc)
+{
+	u16 pf_func, pf_func_mask;
+
+	if (is_npc_intf_rx(intf))
+		return 0;
+
+	pf_func_mask = (entry_data->kw_mask[0] >> 32) &
+		NPC_KEX_PF_FUNC_MASK;
+	pf_func = (entry_data->kw[0] >> 32) & NPC_KEX_PF_FUNC_MASK;
+
+	pf_func = be16_to_cpu((__force __be16)pf_func);
+	if (pf_func_mask != NPC_KEX_PF_FUNC_MASK ||
+	    ((pf_func & ~RVU_PFVF_FUNC_MASK) !=
+	     (pcifunc & ~RVU_PFVF_FUNC_MASK)))
+		return -EINVAL;
+
+	return 0;
+}
+
+int npc_mcam_verify_channel(struct rvu *rvu, u16 pcifunc, u8 intf, u16 channel)
+{
+	int pf = rvu_get_pf(pcifunc);
+	u8 cgx_id, lmac_id;
+	int base = 0, end;
+
+	if (is_npc_intf_tx(intf))
+		return 0;
+
+	if (is_afvf(pcifunc)) {
+		end = rvu_get_num_lbk_chans();
+		if (end < 0)
+			return -EINVAL;
+	} else {
+		rvu_get_cgx_lmac_id(rvu->pf2cgxlmac_map[pf], &cgx_id, &lmac_id);
+		base = NIX_CHAN_CGX_LMAC_CHX(cgx_id, lmac_id, 0x0);
+		/* CGX mapped functions has maximum of 16 channels */
+		end = NIX_CHAN_CGX_LMAC_CHX(cgx_id, lmac_id, 0xF);
+	}
+
+	if (channel < base || channel > end)
+		return -EINVAL;
+
+	return 0;
+}
+
 void rvu_npc_set_pkind(struct rvu *rvu, int pkind, struct rvu_pfvf *pfvf)
 {
 	int blkaddr;
@@ -1935,13 +1985,18 @@ int rvu_mbox_handler_npc_mcam_write_entry(struct rvu *rvu,
 	struct rvu_pfvf *pfvf = rvu_get_pfvf(rvu, req->hdr.pcifunc);
 	struct npc_mcam *mcam = &rvu->hw->mcam;
 	u16 pcifunc = req->hdr.pcifunc;
+	u16 channel, chan_mask;
 	int blkaddr, rc;
 	u8 nix_intf;
 
 	blkaddr = rvu_get_blkaddr(rvu, BLKTYPE_NPC, 0);
 	if (blkaddr < 0)
 		return NPC_MCAM_INVALID_REQ;
 
+	chan_mask = req->entry_data.kw_mask[0] & NPC_KEX_CHAN_MASK;
+	channel = req->entry_data.kw[0] & NPC_KEX_CHAN_MASK;
+	channel &= chan_mask;
+
 	mutex_lock(&mcam->lock);
 	rc = npc_mcam_verify_entry(mcam, pcifunc, req->entry);
 	if (rc)
@@ -1963,6 +2018,17 @@ int rvu_mbox_handler_npc_mcam_write_entry(struct rvu *rvu,
 	else
 		nix_intf = pfvf->nix_rx_intf;
 
+	if (npc_mcam_verify_channel(rvu, pcifunc, req->intf, channel)) {
+		rc = NPC_MCAM_INVALID_REQ;
+		goto exit;
+	}
+
+	if (npc_mcam_verify_pf_func(rvu, &req->entry_data, req->intf,
+				    pcifunc)) {
+		rc = NPC_MCAM_INVALID_REQ;
+		goto exit;
+	}
+
 	npc_config_mcam_entry(rvu, mcam, blkaddr, req->entry, nix_intf,
 			      &req->entry_data, req->enable_entry);
 
@@ -2299,6 +2365,7 @@ int rvu_mbox_handler_npc_mcam_alloc_and_write_entry(struct rvu *rvu,
 	struct npc_mcam *mcam = &rvu->hw->mcam;
 	u16 entry = NPC_MCAM_ENTRY_INVALID;
 	u16 cntr = NPC_MCAM_ENTRY_INVALID;
+	u16 channel, chan_mask;
 	int blkaddr, rc;
 	u8 nix_intf;
 
@@ -2309,6 +2376,17 @@ int rvu_mbox_handler_npc_mcam_alloc_and_write_entry(struct rvu *rvu,
 	if (!is_npc_interface_valid(rvu, req->intf))
 		return NPC_MCAM_INVALID_REQ;
 
+	chan_mask = req->entry_data.kw_mask[0] & NPC_KEX_CHAN_MASK;
+	channel = req->entry_data.kw[0] & NPC_KEX_CHAN_MASK;
+	channel &= chan_mask;
+
+	if (npc_mcam_verify_channel(rvu, req->hdr.pcifunc, req->intf, channel))
+		return NPC_MCAM_INVALID_REQ;
+
+	if (npc_mcam_verify_pf_func(rvu, &req->entry_data, req->intf,
+				    req->hdr.pcifunc))
+		return NPC_MCAM_INVALID_REQ;
+
 	/* Try to allocate a MCAM entry */
 	entry_req.hdr.pcifunc = req->hdr.pcifunc;
 	entry_req.contig = true;