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Currently, flows are only evern finally freed (and the table compacted) from the deferred handlers. Some future ways we want to optimise managing the flow table will rely on this, so enforce it: rather than having the TCP code directly call flow_table_compact(), add a boolean return value to the per-flow deferred handlers. If true, this indicates that the flow code itself should free the flow. This forces all freeing of flows to occur during the flow code's scan of the table in flow_defer_handler() which opens possibilities for future optimisations. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
88 lines
2.2 KiB
C
88 lines
2.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later
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* Copyright Red Hat
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* Author: David Gibson <david@gibson.dropbear.id.au>
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*
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* Tracking for logical "flows" of packets.
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*/
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#ifndef FLOW_H
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#define FLOW_H
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#define FLOW_TIMER_INTERVAL 1000 /* ms */
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/**
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* enum flow_type - Different types of packet flows we track
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*/
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enum flow_type {
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/* Represents an invalid or unused flow */
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FLOW_TYPE_NONE = 0,
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/* A TCP connection between a socket and tap interface */
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FLOW_TCP,
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/* A TCP connection between a host socket and ns socket */
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FLOW_TCP_SPLICE,
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FLOW_NUM_TYPES,
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};
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extern const char *flow_type_str[];
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#define FLOW_TYPE(f) \
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((f)->type < FLOW_NUM_TYPES ? flow_type_str[(f)->type] : "?")
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/**
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* struct flow_common - Common fields for packet flows
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* @type: Type of packet flow
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*/
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struct flow_common {
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uint8_t type;
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};
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#define FLOW_INDEX_BITS 17 /* 128k - 1 */
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#define FLOW_MAX MAX_FROM_BITS(FLOW_INDEX_BITS)
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#define FLOW_TABLE_PRESSURE 30 /* % of FLOW_MAX */
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#define FLOW_FILE_PRESSURE 30 /* % of c->nofile */
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/**
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* struct flow_sidx - ID for one side of a specific flow
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* @side: Side referenced (0 or 1)
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* @flow: Index of flow referenced
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*/
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typedef struct flow_sidx {
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unsigned side :1;
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unsigned flow :FLOW_INDEX_BITS;
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} flow_sidx_t;
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static_assert(sizeof(flow_sidx_t) <= sizeof(uint32_t),
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"flow_sidx_t must fit within 32 bits");
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#define FLOW_SIDX_NONE ((flow_sidx_t){ .flow = FLOW_MAX })
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/**
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* flow_sidx_eq() - Test if two sidx values are equal
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* @a, @b: sidx values
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*
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* Return: true iff @a and @b refer to the same side of the same flow
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*/
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static inline bool flow_sidx_eq(flow_sidx_t a, flow_sidx_t b)
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{
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return (a.flow == b.flow) && (a.side == b.side);
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}
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union flow;
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void flow_defer_handler(const struct ctx *c, const struct timespec *now);
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void flow_log_(const struct flow_common *f, int pri, const char *fmt, ...)
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__attribute__((format(printf, 3, 4)));
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#define flow_log(f_, pri, ...) flow_log_(&(f_)->f, (pri), __VA_ARGS__)
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#define flow_dbg(f, ...) flow_log((f), LOG_DEBUG, __VA_ARGS__)
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#define flow_err(f, ...) flow_log((f), LOG_ERR, __VA_ARGS__)
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#define flow_trace(f, ...) \
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do { \
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if (log_trace) \
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flow_dbg((f), __VA_ARGS__); \
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} while (0)
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#endif /* FLOW_H */
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