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/* SPDX-License-Identifier: GPL-2.0-or-later
 * Copyright Red Hat
 * Author: David Gibson <david@gibson.dropbear.id.au>
 *
 * Tracking for logical "flows" of packets.
 */
#ifndef FLOW_H
#define FLOW_H

/**
 * enum flow_type - Different types of packet flows we track
 */
enum flow_type {
	/* Represents an invalid or unused flow */
	FLOW_TYPE_NONE = 0,
	/* A TCP connection between a socket and tap interface */
	FLOW_TCP,
	/* A TCP connection between a host socket and ns socket */
	FLOW_TCP_SPLICE,

	FLOW_TYPE_MAX = FLOW_TCP_SPLICE,
};

extern const char *flow_type_str[];
#define FLOW_TYPE(f)							\
        ((f)->type <= FLOW_TYPE_MAX ? flow_type_str[(f)->type] : "?")

/**
 * struct flow_common - Common fields for packet flows
 * @type:	Type of packet flow
 */
struct flow_common {
	uint8_t		type;
};

#define FLOW_INDEX_BITS		17	/* 128k - 1 */
#define FLOW_MAX		MAX_FROM_BITS(FLOW_INDEX_BITS)

#define FLOW_TABLE_PRESSURE		30	/* % of FLOW_MAX */
#define FLOW_FILE_PRESSURE		30	/* % of c->nofile */

/**
 * struct flow_sidx - ID for one side of a specific flow
 * @side:	Side referenced (0 or 1)
 * @flow:	Index of flow referenced
 */
typedef struct flow_sidx {
	unsigned	side :1;
	unsigned	flow :FLOW_INDEX_BITS;
} flow_sidx_t;
static_assert(sizeof(flow_sidx_t) <= sizeof(uint32_t));

#define FLOW_SIDX_NONE ((flow_sidx_t){ .flow = FLOW_MAX })

union flow;

void flow_table_compact(struct ctx *c, union flow *hole);

void flow_log_(const struct flow_common *f, int pri, const char *fmt, ...)
	__attribute__((format(printf, 3, 4)));

#define flow_log(f_, pri, ...)	flow_log_(&(f_)->f, (pri), __VA_ARGS__)

#define flow_dbg(f, ...)	flow_log((f), LOG_DEBUG, __VA_ARGS__)
#define flow_err(f, ...)	flow_log((f), LOG_ERR, __VA_ARGS__)

#define flow_trace(f, ...)						\
	do {								\
		if (log_trace)						\
			flow_dbg((f), __VA_ARGS__);			\
	} while (0)

#endif /* FLOW_H */

debug log:

solving 75e2115 ...
found 75e2115 in https://archives.passt.top/passt-dev/20231126233348.1599864-12-david@gibson.dropbear.id.au/
found 3c90bbd in https://archives.passt.top/passt-dev/20231126233348.1599864-8-david@gibson.dropbear.id.au/
found b6da516 in https://archives.passt.top/passt-dev/20231126233348.1599864-7-david@gibson.dropbear.id.au/ ||
	https://archives.passt.top/passt-dev/20231123023629.2024938-7-david@gibson.dropbear.id.au/
found 9f49195 in https://archives.passt.top/passt-dev/20231123023629.2024938-6-david@gibson.dropbear.id.au/ ||
	https://archives.passt.top/passt-dev/20231126233348.1599864-6-david@gibson.dropbear.id.au/
found 57289a8 in https://archives.passt.top/passt-dev/20231123023629.2024938-4-david@gibson.dropbear.id.au/ ||
	https://archives.passt.top/passt-dev/20231126233348.1599864-3-david@gibson.dropbear.id.au/
found 88e6f0b in https://archives.passt.top/passt-dev/20231123023629.2024938-3-david@gibson.dropbear.id.au/ ||
	https://archives.passt.top/passt-dev/20231126233348.1599864-2-david@gibson.dropbear.id.au/

applying [1/6] https://archives.passt.top/passt-dev/20231123023629.2024938-3-david@gibson.dropbear.id.au/
diff --git a/flow.h b/flow.h
new file mode 100644
index 0000000..88e6f0b

Checking patch flow.h...
Applied patch flow.h cleanly.

skipping https://archives.passt.top/passt-dev/20231126233348.1599864-2-david@gibson.dropbear.id.au/ for 88e6f0b
index at:
100644 88e6f0b53cfaaf01bcf58ccd07ca6b6188d3dfb0	flow.h

applying [2/6] https://archives.passt.top/passt-dev/20231123023629.2024938-4-david@gibson.dropbear.id.au/
diff --git a/flow.h b/flow.h
index 88e6f0b..57289a8 100644

Checking patch flow.h...
Applied patch flow.h cleanly.

skipping https://archives.passt.top/passt-dev/20231126233348.1599864-3-david@gibson.dropbear.id.au/ for 57289a8
index at:
100644 57289a8ad2b697beff8a58ebbd11daa95142249b	flow.h

applying [3/6] https://archives.passt.top/passt-dev/20231123023629.2024938-6-david@gibson.dropbear.id.au/
diff --git a/flow.h b/flow.h
index 57289a8..9f49195 100644

Checking patch flow.h...
Applied patch flow.h cleanly.

skipping https://archives.passt.top/passt-dev/20231126233348.1599864-6-david@gibson.dropbear.id.au/ for 9f49195
index at:
100644 9f49195f6df856ce5069d3952c89444ab042e8a9	flow.h

applying [4/6] https://archives.passt.top/passt-dev/20231126233348.1599864-7-david@gibson.dropbear.id.au/
diff --git a/flow.h b/flow.h
index 9f49195..b6da516 100644

Checking patch flow.h...
Applied patch flow.h cleanly.

skipping https://archives.passt.top/passt-dev/20231123023629.2024938-7-david@gibson.dropbear.id.au/ for b6da516
index at:
100644 b6da516ee659fac906d20aa79cb94ef37b95cf72	flow.h

applying [5/6] https://archives.passt.top/passt-dev/20231126233348.1599864-8-david@gibson.dropbear.id.au/
diff --git a/flow.h b/flow.h
index b6da516..3c90bbd 100644


applying [6/6] https://archives.passt.top/passt-dev/20231126233348.1599864-12-david@gibson.dropbear.id.au/
diff --git a/flow.h b/flow.h
index 3c90bbd..75e2115 100644

Checking patch flow.h...
Applied patch flow.h cleanly.
Checking patch flow.h...
Applied patch flow.h cleanly.

index at:
100644 75e211534f4490b6edefd7362c554b03f31deb60	flow.h

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