octeontx2-af: Support for changing RSS algorithm

This patch adds support for a RVU PF/VF to change
NIX Rx flowkey algorithm index in NPC RX RSS_ACTION.
eg: a ethtool command changing RSS algorithm for a netdev
interface would trigger this change in NPC.

If PF/VF doesn't specify any MCAM entry index then default
UCAST entry of the NIXLF attached to PF/VF will be updated
with RSS_ACTION and flowkey index.

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

@@ -157,7 +157,8 @@ M(NIX_TXSCH_ALLOC,	0x8004, nix_txsch_alloc_req, nix_txsch_alloc_rsp) \
 M(NIX_TXSCH_FREE,	0x8005, nix_txsch_free_req, msg_rsp)		\
 M(NIX_TXSCHQ_CFG,	0x8006, nix_txschq_config, msg_rsp)		\
 M(NIX_STATS_RST,	0x8007, msg_req, msg_rsp)			\
-M(NIX_VTAG_CFG,	0x8008, nix_vtag_config, msg_rsp)
+M(NIX_VTAG_CFG,	0x8008, nix_vtag_config, msg_rsp)		\
+M(NIX_RSS_FLOWKEY_CFG,  0x8009, nix_rss_flowkey_cfg, msg_rsp)
 
 /* Messages initiated by AF (range 0xC00 - 0xDFF) */
 #define MBOX_UP_CGX_MESSAGES						\
@@ -499,4 +500,11 @@ struct nix_vtag_config {
 	};
 };
 
+struct nix_rss_flowkey_cfg {
+	struct mbox_msghdr hdr;
+	int	mcam_index;  /* MCAM entry index to modify */
+	u32	flowkey_cfg; /* Flowkey types selected */
+	u8	group;       /* RSS context or group */
+};
+
 #endif /* MBOX_H */

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

@@ -341,6 +341,9 @@ 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_RSS_FLOWKEY_CFG(struct rvu *rvu,
+					 struct nix_rss_flowkey_cfg *req,
+					 struct msg_rsp *rsp);
 
 /* NPC APIs */
 int rvu_npc_init(struct rvu *rvu);
@@ -352,4 +355,6 @@ void rvu_npc_install_ucast_entry(struct rvu *rvu, u16 pcifunc,
 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_update_flowkey_alg_idx(struct rvu *rvu, u16 pcifunc, int nixlf,
+				    int group, int alg_idx, int mcam_index);
 #endif /* RVU_H */

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

@@ -1536,6 +1536,57 @@ int rvu_mbox_handler_NIX_STATS_RST(struct rvu *rvu, struct msg_req *req,
 	return 0;
 }
 
+/* Returns the ALG index to be set into NPC_RX_ACTION */
+static int get_flowkey_alg_idx(u32 flow_cfg)
+{
+	u32 ip_cfg;
+
+	flow_cfg &= ~FLOW_KEY_TYPE_PORT;
+	ip_cfg = FLOW_KEY_TYPE_IPV4 | FLOW_KEY_TYPE_IPV6;
+	if (flow_cfg == ip_cfg)
+		return FLOW_KEY_ALG_IP;
+	else if (flow_cfg == (ip_cfg | FLOW_KEY_TYPE_TCP))
+		return FLOW_KEY_ALG_TCP;
+	else if (flow_cfg == (ip_cfg | FLOW_KEY_TYPE_UDP))
+		return FLOW_KEY_ALG_UDP;
+	else if (flow_cfg == (ip_cfg | FLOW_KEY_TYPE_SCTP))
+		return FLOW_KEY_ALG_SCTP;
+	else if (flow_cfg == (ip_cfg | FLOW_KEY_TYPE_TCP | FLOW_KEY_TYPE_UDP))
+		return FLOW_KEY_ALG_TCP_UDP;
+	else if (flow_cfg == (ip_cfg | FLOW_KEY_TYPE_TCP | FLOW_KEY_TYPE_SCTP))
+		return FLOW_KEY_ALG_TCP_SCTP;
+	else if (flow_cfg == (ip_cfg | FLOW_KEY_TYPE_UDP | FLOW_KEY_TYPE_SCTP))
+		return FLOW_KEY_ALG_UDP_SCTP;
+	else if (flow_cfg == (ip_cfg | FLOW_KEY_TYPE_TCP |
+			      FLOW_KEY_TYPE_UDP | FLOW_KEY_TYPE_SCTP))
+		return FLOW_KEY_ALG_TCP_UDP_SCTP;
+
+	return FLOW_KEY_ALG_PORT;
+}
+
+int rvu_mbox_handler_NIX_RSS_FLOWKEY_CFG(struct rvu *rvu,
+					 struct nix_rss_flowkey_cfg *req,
+					 struct msg_rsp *rsp)
+{
+	struct rvu_hwinfo *hw = rvu->hw;
+	u16 pcifunc = req->hdr.pcifunc;
+	int alg_idx, nixlf, blkaddr;
+
+	blkaddr = rvu_get_blkaddr(rvu, BLKTYPE_NIX, pcifunc);
+	if (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;
+
+	alg_idx = get_flowkey_alg_idx(req->flowkey_cfg);
+
+	rvu_npc_update_flowkey_alg_idx(rvu, pcifunc, nixlf, req->group,
+				       alg_idx, req->mcam_index);
+	return 0;
+}
+
 static void set_flowkey_fields(struct nix_rx_flowkey_alg *alg, u32 flow_cfg)
 {
 	struct nix_rx_flowkey_alg *field = NULL;

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

@@ -358,6 +358,49 @@ void rvu_npc_install_bcast_match_entry(struct rvu *rvu, u16 pcifunc,
 			      NIX_INTF_RX, &entry, true);
 }
 
+void rvu_npc_update_flowkey_alg_idx(struct rvu *rvu, u16 pcifunc, int nixlf,
+				    int group, int alg_idx, int mcam_index)
+{
+	struct npc_mcam *mcam = &rvu->hw->mcam;
+	struct nix_rx_action action;
+	int blkaddr, index, bank;
+
+	blkaddr = rvu_get_blkaddr(rvu, BLKTYPE_NPC, 0);
+	if (blkaddr < 0)
+		return;
+
+	/* Check if this is for reserved default entry */
+	if (mcam_index < 0) {
+		if (group != DEFAULT_RSS_CONTEXT_GROUP)
+			return;
+		index = npc_get_nixlf_mcam_index(mcam, pcifunc,
+						 nixlf, NIXLF_UCAST_ENTRY);
+	} else {
+		/* TODO: validate this mcam index */
+		index = mcam_index;
+	}
+
+	if (index >= mcam->total_entries)
+		return;
+
+	bank = npc_get_bank(mcam, index);
+	index &= (mcam->banksize - 1);
+
+	*(u64 *)&action = rvu_read64(rvu, blkaddr,
+				     NPC_AF_MCAMEX_BANKX_ACTION(index, bank));
+	/* Ignore if no action was set earlier */
+	if (!*(u64 *)&action)
+		return;
+
+	action.op = NIX_RX_ACTIONOP_RSS;
+	action.pf_func = pcifunc;
+	action.index = group;
+	action.flow_key_alg = alg_idx;
+
+	rvu_write64(rvu, blkaddr,
+		    NPC_AF_MCAMEX_BANKX_ACTION(index, bank), *(u64 *)&action);
+}
+
 void rvu_npc_disable_mcam_entries(struct rvu *rvu, u16 pcifunc, int nixlf)
 {
 	struct npc_mcam *mcam = &rvu->hw->mcam;