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mptcp: add and use MIB counter infrastructure

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Exported via same /proc file as the Linux TCP MIB counters, so "netstat -s"
or "nstat" will show them automatically.

The MPTCP MIB counters are allocated in a distinct pcpu area in order to
avoid bloating/wasting TCP pcpu memory.

Counters are allocated once the first MPTCP socket is created in a
network namespace and free'd on exit.

If no sockets have been allocated, all-zero mptcp counters are shown.

The MIB counter list is taken from the multipath-tcp.org kernel, but
only a few counters have been picked up so far.  The counter list can
be increased at any time later on.

v2 -> v3:
 - remove 'inline' in foo.c files (David S. Miller)

Co-developed-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Westphal
2020-03-27 14:48:50 -07:00
committed by David S. Miller
parent 5147dfb508
commit fc518953bc
9 changed files with 172 additions and 15 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
net/ipv4/proc.c
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@@ -32,6 +32,7 @@
#include <net/icmp.h>
#include <net/protocol.h>
#include <net/tcp.h>
#include <net/mptcp.h>
#include <net/udp.h>
#include <net/udplite.h>
#include <linux/bottom_half.h>
@@ -485,6 +486,7 @@ static int netstat_seq_show(struct seq_file *seq, void *v)
offsetof(struct ipstats_mib, syncp)));
seq_putc(seq, '\n');
mptcp_seq_show(seq);
return 0;
}