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chardev: add nodelay option

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The "delay" option was introduced as a way to enable Nagle's algorithm
with ",nodelay".  Since the short form for boolean options has now been
deprecated, introduce a more properly named "nodelay" option.  The "delay"
option remains as an undocumented option.

"delay" and "nodelay" are mutually exclusive.  Because the check is
done at consumption time, the code also rejects them if one of the
two is specified via -set.

Based-on: <20210226080526.651705-1-pbonzini@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2021-02-25 11:47:52 +01:00
parent 9f34101db0
commit a9b1315f86
4 changed files with 22 additions and 10 deletions
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13
chardev/char-socket.c
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@ -1472,8 +1472,17 @@ static void qemu_chr_parse_socket(QemuOpts *opts, ChardevBackend *backend,
sock = backend->u.socket.data = g_new0(ChardevSocket, 1);
qemu_chr_parse_common(opts, qapi_ChardevSocket_base(sock));
sock->has_nodelay = qemu_opt_get(opts, "delay");
sock->nodelay = !qemu_opt_get_bool(opts, "delay", true);
if (qemu_opt_get(opts, "delay") && qemu_opt_get(opts, "nodelay")) {
error_setg(errp, "'delay' and 'nodelay' are mutually exclusive");
return;
}
sock->has_nodelay =
qemu_opt_get(opts, "delay") ||
qemu_opt_get(opts, "nodelay");
sock->nodelay =
!qemu_opt_get_bool(opts, "delay", true) ||
qemu_opt_get_bool(opts, "nodelay", false);
/*
* We have different default to QMP for 'server', hence
* we can't just check for existence of 'server'