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06ef64cdb7
Shuffle the fields just added by commitsa7775e9550("udp: support traceroute in direction tap-socket") and9725e79888("udp_flow: Don't discard packets that arrive between bind() and connect()"). On x86_64, as reported by pahole(1), before: struct udp_flow { struct flow_common f; /* 0 76 */ /* --- cacheline 1 boundary (64 bytes) was 12 bytes ago --- */ _Bool closed:1; /* 76: 0 1 */ /* XXX 7 bits hole, try to pack */ _Bool flush0; /* 77 1 */ _Bool flush1:1; /* 78: 0 1 */ /* XXX 7 bits hole, try to pack */ /* XXX 1 byte hole, try to pack */ time_t ts; /* 80 8 */ int s[2]; /* 88 8 */ uint8_t ttl[2]; /* 96 2 */ /* size: 104, cachelines: 2, members: 7 */ /* sum members: 95, holes: 1, sum holes: 1 */ /* sum bitfield members: 2 bits, bit holes: 2, sum bit holes: 14 bits */ /* padding: 6 */ /* last cacheline: 40 bytes */ }; and after: struct udp_flow { struct flow_common f; /* 0 76 */ /* --- cacheline 1 boundary (64 bytes) was 12 bytes ago --- */ uint8_t ttl[2]; /* 76 2 */ _Bool closed:1; /* 78: 0 1 */ _Bool flush0:1; /* 78: 1 1 */ _Bool flush1:1; /* 78: 2 1 */ /* XXX 5 bits hole, try to pack */ /* XXX 1 byte hole, try to pack */ time_t ts; /* 80 8 */ int s[2]; /* 88 8 */ /* size: 96, cachelines: 2, members: 7 */ /* sum members: 94, holes: 1, sum holes: 1 */ /* sum bitfield members: 3 bits, bit holes: 1, sum bit holes: 5 bits */ /* last cacheline: 32 bytes */ }; It doesn't matter much because anyway the typical storage for struct udp_flow is given by union flow: union flow { struct flow_common f; /* 0 76 */ struct flow_free_cluster free; /* 0 84 */ struct tcp_tap_conn tcp; /* 0 120 */ struct tcp_splice_conn tcp_splice; /* 0 120 */ struct icmp_ping_flow ping; /* 0 96 */ struct udp_flow udp; /* 0 96 */ }; but it still improves data locality somewhat, so let me fix this up now that commits are fresh. Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
49 lines
1.4 KiB
C
49 lines
1.4 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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* UDP flow tracking data structures
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*/
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#ifndef UDP_FLOW_H
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#define UDP_FLOW_H
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/**
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* struct udp_flow - Descriptor for a flow of UDP packets
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* @f: Generic flow information
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* @ttl: TTL or hop_limit for both sides
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* @closed: Flow is already closed
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* @flush0: @s[0] may have datagrams queued for other flows
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* @flush1: @s[1] may have datagrams queued for other flows
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* @ts: Activity timestamp
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* @s: Socket fd (or -1) for each side of the flow
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*/
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struct udp_flow {
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/* Must be first element */
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struct flow_common f;
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uint8_t ttl[SIDES];
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bool closed :1,
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flush0 :1,
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flush1 :1;
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time_t ts;
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int s[SIDES];
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};
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struct udp_flow *udp_at_sidx(flow_sidx_t sidx);
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flow_sidx_t udp_flow_from_sock(const struct ctx *c, uint8_t pif, in_port_t port,
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const union sockaddr_inany *s_in,
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const struct timespec *now);
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flow_sidx_t udp_flow_from_tap(const struct ctx *c,
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uint8_t pif, sa_family_t af,
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const void *saddr, const void *daddr,
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in_port_t srcport, in_port_t dstport,
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const struct timespec *now);
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void udp_flow_close(const struct ctx *c, struct udp_flow *uflow);
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bool udp_flow_defer(const struct ctx *c, struct udp_flow *uflow,
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const struct timespec *now);
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bool udp_flow_timer(const struct ctx *c, struct udp_flow *uflow,
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const struct timespec *now);
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#endif /* UDP_FLOW_H */
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