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Currently TCP uses the 'flow' epoll_ref field for both connected sockets and timers, which consists of just the index of the relevant flow (connection). This is just fine for timers, for while it obviously works, it's subtly incomplete for sockets on spliced connections. In that case we want to know which side of the connection the event is occurring on as well as which connection. At present, we deduce that information by looking at the actual fd, and comparing it to the fds of the sockets on each side. When we use the flow table for more things, we expect more cases where something will need to know a specific side of a specific flow for an event, but nothing more. Therefore add a new 'flowside' epoll_ref field, with exactly that information. We use it for TCP connected sockets. This allows us to directly know the side for spliced connections. For "tap" connections, it's pretty meaningless, since the side is always the socket side. It still makes logical sense though, and it may become important for future flow table work. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
20 lines
553 B
C
20 lines
553 B
C
/* SPDX-License-Identifier: GPL-2.0-or-later
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* Copyright (c) 2022 Red Hat GmbH
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* Author: Stefano Brivio <sbrivio@redhat.com>
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*/
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#ifndef TCP_SPLICE_H
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#define TCP_SPLICE_H
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struct tcp_splice_conn;
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void tcp_splice_sock_handler(struct ctx *c, struct tcp_splice_conn *conn,
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int side, uint32_t events);
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bool tcp_splice_conn_from_sock(const struct ctx *c,
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union tcp_listen_epoll_ref ref,
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struct tcp_splice_conn *conn, int s,
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const struct sockaddr *sa);
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void tcp_splice_init(struct ctx *c);
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#endif /* TCP_SPLICE_H */
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