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Since UDP has no built in knowledge of connections, the only way we
know when we're done with a UDP flow is a timeout with no activity.
To keep track of this struct udp_flow includes a timestamp to record
the last time we saw traffic on the flow.
For data from listening sockets and from tap, this is done implicitly via
udp_flow_from_{sock,tap}() but for reply sockets it's done explicitly.
However, that logic is duplicated between the vhost-user and "buf" paths.
Make it common in udp_reply_sock_handler() instead.
Technically this is a behavioural change: previously if we got an EPOLLIN
event, but there wasn't actually any data we wouldn't update the timestamp,
now we will. This should be harmless: if there's an EPOLLIN we expect
there to be data, and even if there isn't the worst we can do is mildly
delay the cleanup of a stale flow.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
13 lines
361 B
C
13 lines
361 B
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* Copyright Red Hat
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* Author: Laurent Vivier <lvivier@redhat.com>
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*/
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#ifndef UDP_VU_H
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#define UDP_VU_H
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void udp_vu_listen_sock_data(const struct ctx *c, union epoll_ref ref,
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const struct timespec *now);
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bool udp_vu_reply_sock_data(const struct ctx *c, int s, flow_sidx_t tosidx);
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#endif /* UDP_VU_H */
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