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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

30
net/mptcp/protocol.c
View file

@ -21,6 +21,7 @@
#endif
#include <net/mptcp.h>
#include "protocol.h"
#include "mib.h"
#define MPTCP_SAME_STATE TCP_MAX_STATES
@ -1032,6 +1033,7 @@ static void mptcp_worker(struct work_struct *work)
if (ret < 0)
break;
MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_RETRANSSEGS);
copied += ret;
dfrag->data_len -= ret;
dfrag->offset += ret;
@ -1081,17 +1083,22 @@ static int __mptcp_init_sock(struct sock *sk)
static int mptcp_init_sock(struct sock *sk)
{
int ret = __mptcp_init_sock(sk);
struct net *net = sock_net(sk);
int ret;
if (!mptcp_is_enabled(net))
return -ENOPROTOOPT;
if (unlikely(!net->mib.mptcp_statistics) && !mptcp_mib_alloc(net))
return -ENOMEM;
ret = __mptcp_init_sock(sk);
if (ret)
return ret;
sk_sockets_allocated_inc(sk);
sk->sk_sndbuf = sock_net(sk)->ipv4.sysctl_tcp_wmem[2];
if (!mptcp_is_enabled(sock_net(sk)))
return -ENOPROTOOPT;
return 0;
}
@ -1327,7 +1334,12 @@ static struct sock *mptcp_accept(struct sock *sk, int flags, int *err,
list_add(&subflow->node, &msk->conn_list);
bh_unlock_sock(new_mptcp_sock);
__MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_MPCAPABLEPASSIVEACK);
local_bh_enable();
} else {
MPTCP_INC_STATS(sock_net(sk),
MPTCP_MIB_MPCAPABLEPASSIVEFALLBACK);
}
return newsk;
@ -1448,13 +1460,15 @@ void mptcp_finish_connect(struct sock *ssk)
u64 ack_seq;
subflow = mptcp_subflow_ctx(ssk);
if (!subflow->mp_capable)
return;
sk = subflow->conn;
msk = mptcp_sk(sk);
if (!subflow->mp_capable) {
MPTCP_INC_STATS(sock_net(sk),
MPTCP_MIB_MPCAPABLEACTIVEFALLBACK);
return;
}
pr_debug("msk=%p, token=%u", sk, subflow->token);
mptcp_crypto_key_sha(subflow->remote_key, NULL, &ack_seq);