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04190bf894
SOCK_SNDBUF_LOCK and SOCK_RCVBUF_LOCK flags disable automatic socket
buffers adjustment done by kernel (see tcp_fixup_rcvbuf() and
tcp_sndbuf_expand()). If we've just created a new socket this adjustment
is enabled on it, but if one changes the socket buffer size by
setsockopt(SO_{SND,RCV}BUF*) it becomes disabled.
CRIU needs to call setsockopt(SO_{SND,RCV}BUF*) on each socket on
restore as it first needs to increase buffer sizes for packet queues
restore and second it needs to restore back original buffer sizes. So
after CRIU restore all sockets become non-auto-adjustable, which can
decrease network performance of restored applications significantly.
CRIU need to be able to restore sockets with enabled/disabled adjustment
to the same state it was before dump, so let's add special setsockopt
for it.
Let's also export SOCK_SNDBUF_LOCK and SOCK_RCVBUF_LOCK flags to uAPI so
that using these interface one can reenable automatic socket buffer
adjustment on their sockets.
Signed-off-by: Pavel Tikhomirov <ptikhomirov@virtuozzo.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
34 lines
955 B
C
34 lines
955 B
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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#ifndef _UAPI_LINUX_SOCKET_H
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#define _UAPI_LINUX_SOCKET_H
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/*
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* Desired design of maximum size and alignment (see RFC2553)
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*/
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#define _K_SS_MAXSIZE 128 /* Implementation specific max size */
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typedef unsigned short __kernel_sa_family_t;
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/*
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* The definition uses anonymous union and struct in order to control the
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* default alignment.
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*/
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struct __kernel_sockaddr_storage {
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union {
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struct {
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__kernel_sa_family_t ss_family; /* address family */
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/* Following field(s) are implementation specific */
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char __data[_K_SS_MAXSIZE - sizeof(unsigned short)];
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/* space to achieve desired size, */
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/* _SS_MAXSIZE value minus size of ss_family */
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};
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void *__align; /* implementation specific desired alignment */
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};
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};
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#define SOCK_SNDBUF_LOCK 1
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#define SOCK_RCVBUF_LOCK 2
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#define SOCK_BUF_LOCK_MASK (SOCK_SNDBUF_LOCK | SOCK_RCVBUF_LOCK)
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#endif /* _UAPI_LINUX_SOCKET_H */
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