Subject: [PATCH iwl-next v7 15/15] ice: add API for parser profile initialization

From: Junfeng Guo <[email-masked]>
Date: Wed, 23 Aug 2023 17:31:58 +0800

Add API ice_parser_profile_init to init a parser profile base on
a parser result and a mask buffer. The ice_parser_profile can feed to
low level FXP engine to create HW profile / field vector directly.

Signed-off-by: Junfeng Guo <[email-masked]>
---
 drivers/net/ethernet/intel/ice/ice_parser.c | 114 ++++++++++++++++++++
 drivers/net/ethernet/intel/ice/ice_parser.h |  27 +++++
 2 files changed, 141 insertions(+)

diff --git a/drivers/net/ethernet/intel/ice/ice_parser.c b/drivers/net/ethernet/intel/ice/ice_parser.c
index 85a2833ffc58..7a4cf7e9da57 100644
--- a/drivers/net/ethernet/intel/ice/ice_parser.c
+++ b/drivers/net/ethernet/intel/ice/ice_parser.c
@@ -446,3 +446,117 @@ int ice_parser_ecpri_tunnel_set(struct ice_parser *psr,
 {
 	return _ice_tunnel_port_set(psr, "TNL_UDP_ECPRI", udp_port, on);
 }
+
+static bool _ice_nearest_proto_id(struct ice_parser_result *rslt, u16 offset,
+				  u8 *proto_id, u16 *proto_off)
+{
+	u16 dist = U16_MAX;
+	u8 proto = 0;
+	int i;
+
+	for (i = 0; i < rslt->po_num; i++) {
+		if (offset < rslt->po[i].offset)
+			continue;
+		if (offset - rslt->po[i].offset < dist) {
+			proto	= rslt->po[i].proto_id;
+			dist	= offset - rslt->po[i].offset;
+		}
+	}
+
+	if (dist % 2)
+		return false;
+
+	*proto_id = proto;
+	*proto_off = dist;
+
+	return true;
+}
+
+/** default flag mask to cover GTP_EH_PDU, GTP_EH_PDU_LINK and TUN2
+ * In future, the flag masks should learn from DDP
+ */
+#define ICE_KEYBUILD_FLAG_MASK_DEFAULT_SW	0x4002
+#define ICE_KEYBUILD_FLAG_MASK_DEFAULT_ACL	0x0000
+#define ICE_KEYBUILD_FLAG_MASK_DEFAULT_FD	0x6080
+#define ICE_KEYBUILD_FLAG_MASK_DEFAULT_RSS	0x6010
+
+/**
+ * ice_parser_profile_init  - initialize a FXP profile base on parser result
+ * @rslt: a instance of a parser result
+ * @pkt_buf: packet data buffer
+ * @msk_buf: packet mask buffer
+ * @buf_len: packet length
+ * @blk: FXP pipeline stage
+ * @prefix_match: match protocol stack exactly or only prefix
+ * @prof: input/output parameter to save the profile
+ */
+int ice_parser_profile_init(struct ice_parser_result *rslt,
+			    const u8 *pkt_buf, const u8 *msk_buf,
+			    int buf_len, enum ice_block blk,
+			    bool prefix_match,
+			    struct ice_parser_profile *prof)
+{
+	u8 proto_id = U8_MAX;
+	u16 proto_off = 0;
+	u16 off;
+
+	memset(prof, 0, sizeof(*prof));
+	set_bit(rslt->ptype, prof->ptypes);
+	if (blk == ICE_BLK_SW) {
+		prof->flags	= rslt->flags_sw;
+		prof->flags_msk	= ICE_KEYBUILD_FLAG_MASK_DEFAULT_SW;
+	} else if (blk == ICE_BLK_ACL) {
+		prof->flags	= rslt->flags_acl;
+		prof->flags_msk	= ICE_KEYBUILD_FLAG_MASK_DEFAULT_ACL;
+	} else if (blk == ICE_BLK_FD) {
+		prof->flags	= rslt->flags_fd;
+		prof->flags_msk	= ICE_KEYBUILD_FLAG_MASK_DEFAULT_FD;
+	} else if (blk == ICE_BLK_RSS) {
+		prof->flags	= rslt->flags_rss;
+		prof->flags_msk	= ICE_KEYBUILD_FLAG_MASK_DEFAULT_RSS;
+	} else {
+		return -EINVAL;
+	}
+
+	for (off = 0; off < buf_len - 1; off++) {
+		if (msk_buf[off] == 0 && msk_buf[off + 1] == 0)
+			continue;
+		if (!_ice_nearest_proto_id(rslt, off, &proto_id, &proto_off))
+			continue;
+		if (prof->fv_num >= ICE_PARSER_FV_MAX)
+			return -EINVAL;
+
+		prof->fv[prof->fv_num].proto_id	= proto_id;
+		prof->fv[prof->fv_num].offset	= proto_off;
+		prof->fv[prof->fv_num].spec	= *(const u16 *)&pkt_buf[off];
+		prof->fv[prof->fv_num].msk	= *(const u16 *)&msk_buf[off];
+		prof->fv_num++;
+	}
+
+	return 0;
+}
+
+/**
+ * ice_parser_profile_dump - dump an FXP profile info
+ * @hw: pointer to the hardware structure
+ * @prof: profile info to dump
+ */
+void ice_parser_profile_dump(struct ice_hw *hw,
+			     struct ice_parser_profile *prof)
+{
+	u16 i;
+
+	dev_info(ice_hw_to_dev(hw), "ptypes:\n");
+	for (i = 0; i < ICE_FLOW_PTYPE_MAX; i++)
+		if (test_bit(i, prof->ptypes))
+			dev_info(ice_hw_to_dev(hw), "\t%d\n", i);
+
+	for (i = 0; i < prof->fv_num; i++)
+		dev_info(ice_hw_to_dev(hw),
+			 "proto = %d, offset = %2d; spec = 0x%04x, mask = 0x%04x\n",
+			 prof->fv[i].proto_id, prof->fv[i].offset,
+			 prof->fv[i].spec, prof->fv[i].msk);
+
+	dev_info(ice_hw_to_dev(hw), "flags = 0x%04x\n", prof->flags);
+	dev_info(ice_hw_to_dev(hw), "flags_msk = 0x%04x\n", prof->flags_msk);
+}
diff --git a/drivers/net/ethernet/intel/ice/ice_parser.h b/drivers/net/ethernet/intel/ice/ice_parser.h
index 3cfcec4dc477..503c610b5c92 100644
--- a/drivers/net/ethernet/intel/ice/ice_parser.h
+++ b/drivers/net/ethernet/intel/ice/ice_parser.h
@@ -33,6 +33,8 @@
 #define ICE_SID_LBL_ENTRY_SIZE				66
 
 #define ICE_PARSER_PROTO_OFF_PAIR_SIZE			16
+#define ICE_PARSER_FV_SIZE				48
+#define ICE_PARSER_FV_MAX				24
 #define ICE_BT_TUN_PORT_OFF_H				16
 #define ICE_BT_TUN_PORT_OFF_L				15
 #define ICE_UDP_PORT_OFF_H				1
@@ -110,4 +112,29 @@ struct ice_parser_result {
 int ice_parser_run(struct ice_parser *psr, const u8 *pkt_buf,
 		   int pkt_len, struct ice_parser_result *rslt);
 void ice_parser_result_dump(struct ice_hw *hw, struct ice_parser_result *rslt);
+
+struct ice_parser_fv {
+	u8 proto_id;	/* hardware protocol ID */
+	u16 offset;	/* offset from the start of the protocol header */
+	u16 spec;	/* 16 bits pattern to match */
+	u16 msk;	/* 16 bits pattern mask */
+};
+
+struct ice_parser_profile {
+	/* array of field vectors */
+	struct ice_parser_fv fv[ICE_PARSER_FV_SIZE];
+	int fv_num;		/* # of field vectors must <= 48 */
+	u16 flags;		/* 16 bits key builder flags */
+	u16 flags_msk;		/* key builder flag mask */
+
+	DECLARE_BITMAP(ptypes, ICE_FLOW_PTYPE_MAX); /* PTYPE bitmap */
+};
+
+int ice_parser_profile_init(struct ice_parser_result *rslt,
+			    const u8 *pkt_buf, const u8 *msk_buf,
+					int buf_len, enum ice_block blk,
+					bool prefix_match,
+					struct ice_parser_profile *prof);
+void ice_parser_profile_dump(struct ice_hw *hw,
+			     struct ice_parser_profile *prof);
 #endif /* _ICE_PARSER_H_ */
-- 
2.25.1