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Code Issues Releases Wiki Activity

mptcp: track some aggregate data counters

Browse Source 
Currently there are no data transfer counters accounting for all
the subflows used by a given MPTCP socket. The user-space can compute
such figures aggregating the subflow info, but that is inaccurate
if any subflow is closed before the MPTCP socket itself.

Add the new counters in the MPTCP socket itself and expose them
via the existing diag and sockopt. While touching mptcp_diag_fill_info(),
acquire the relevant locks before fetching the msk data, to ensure
better data consistency

Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/385
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Paolo Abeni 2023-06-20 18:30:15 +02:00 committed by Jakub Kicinski
parent c026d33b8f
commit 38967f424b
5 changed files with 47 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
include/uapi/linux/mptcp.h
View File

@ -123,6 +123,11 @@ struct mptcp_info {
__u8 mptcpi_local_addr_used;
__u8 mptcpi_local_addr_max;
__u8 mptcpi_csum_enabled;
__u32 mptcpi_retransmits;
__u64 mptcpi_bytes_retrans;
__u64 mptcpi_bytes_sent;
__u64 mptcpi_bytes_received;
__u64 mptcpi_bytes_acked;
};
/*

10
net/mptcp/options.c
View File

@ -1026,6 +1026,12 @@ u64 __mptcp_expand_seq(u64 old_seq, u64 cur_seq)
return cur_seq;
}
static void __mptcp_snd_una_update(struct mptcp_sock *msk, u64 new_snd_una)
{
msk->bytes_acked += new_snd_una - msk->snd_una;
msk->snd_una = new_snd_una;
}
static void ack_update_msk(struct mptcp_sock *msk,
struct sock *ssk,
struct mptcp_options_received *mp_opt)
@ -1057,7 +1063,7 @@ static void ack_update_msk(struct mptcp_sock *msk,
__mptcp_check_push(sk, ssk);
if (after64(new_snd_una, old_snd_una)) {
msk->snd_una = new_snd_una;
__mptcp_snd_una_update(msk, new_snd_una);
__mptcp_data_acked(sk);
}
mptcp_data_unlock(sk);
@ -1123,7 +1129,7 @@ bool mptcp_incoming_options(struct sock *sk, struct sk_buff *skb)
/* on fallback we just need to ignore the msk-level snd_una, as
* this is really plain TCP
*/
msk->snd_una = READ_ONCE(msk->snd_nxt);
__mptcp_snd_una_update(msk, READ_ONCE(msk->snd_nxt));
__mptcp_data_acked(subflow->conn);
mptcp_data_unlock(subflow->conn);

11
net/mptcp/protocol.c
View File

@ -377,6 +377,7 @@ static bool __mptcp_move_skb(struct mptcp_sock *msk, struct sock *ssk,
if (MPTCP_SKB_CB(skb)->map_seq == msk->ack_seq) {
/* in sequence */
msk->bytes_received += copy_len;
WRITE_ONCE(msk->ack_seq, msk->ack_seq + copy_len);
tail = skb_peek_tail(&sk->sk_receive_queue);
if (tail && mptcp_try_coalesce(sk, tail, skb))
@ -760,6 +761,7 @@ static bool __mptcp_ofo_queue(struct mptcp_sock *msk)
MPTCP_SKB_CB(skb)->map_seq += delta;
__skb_queue_tail(&sk->sk_receive_queue, skb);
}
msk->bytes_received += end_seq - msk->ack_seq;
msk->ack_seq = end_seq;
moved = true;
}
@ -1531,8 +1533,10 @@ static void mptcp_update_post_push(struct mptcp_sock *msk,
* that has been handed to the subflow for transmission
* and skip update in case it was old dfrag.
*/
if (likely(after64(snd_nxt_new, msk->snd_nxt)))
if (likely(after64(snd_nxt_new, msk->snd_nxt))) {
msk->bytes_sent += snd_nxt_new - msk->snd_nxt;
msk->snd_nxt = snd_nxt_new;
}
}
void mptcp_check_and_set_pending(struct sock *sk)
@ -2590,6 +2594,7 @@ static void __mptcp_retrans(struct sock *sk)
}
if (copied) {
dfrag->already_sent = max(dfrag->already_sent, info.sent);
msk->bytes_retrans += copied;
tcp_push(ssk, 0, info.mss_now, tcp_sk(ssk)->nonagle,
info.size_goal);
WRITE_ONCE(msk->allow_infinite_fallback, false);
@ -3102,6 +3107,10 @@ static int mptcp_disconnect(struct sock *sk, int flags)
WRITE_ONCE(msk->csum_enabled, mptcp_is_checksum_enabled(sock_net(sk)));
mptcp_pm_data_reset(msk);
mptcp_ca_reset(sk);
msk->bytes_acked = 0;
msk->bytes_received = 0;
msk->bytes_sent = 0;
msk->bytes_retrans = 0;
WRITE_ONCE(sk->sk_shutdown, 0);
sk_error_report(sk);

4
net/mptcp/protocol.h
View File

@ -262,10 +262,13 @@ struct mptcp_sock {
u64 local_key;
u64 remote_key;
u64 write_seq;
u64 bytes_sent;
u64 snd_nxt;
u64 bytes_received;
u64 ack_seq;
atomic64_t rcv_wnd_sent;
u64 rcv_data_fin_seq;
u64 bytes_retrans;
int rmem_fwd_alloc;
struct sock *last_snd;
int snd_burst;
@ -274,6 +277,7 @@ struct mptcp_sock {
* recovery related fields are under data_lock
* protection
*/
u64 bytes_acked;
u64 snd_una;
u64 wnd_end;
unsigned long timer_ival;

25
net/mptcp/sockopt.c
View File

@ -889,7 +889,9 @@ out:
void mptcp_diag_fill_info(struct mptcp_sock *msk, struct mptcp_info *info)
{
struct sock *sk = (struct sock *)msk;
u32 flags = 0;
bool slow;
memset(info, 0, sizeof(*info));
@ -898,6 +900,9 @@ void mptcp_diag_fill_info(struct mptcp_sock *msk, struct mptcp_info *info)
info->mptcpi_add_addr_accepted = READ_ONCE(msk->pm.add_addr_accepted);
info->mptcpi_local_addr_used = READ_ONCE(msk->pm.local_addr_used);
if (inet_sk_state_load(sk) == TCP_LISTEN)
return;
/* The following limits only make sense for the in-kernel PM */
if (mptcp_pm_is_kernel(msk)) {
info->mptcpi_subflows_max =
@ -915,11 +920,21 @@ void mptcp_diag_fill_info(struct mptcp_sock *msk, struct mptcp_info *info)
if (READ_ONCE(msk->can_ack))
flags |= MPTCP_INFO_FLAG_REMOTE_KEY_RECEIVED;
info->mptcpi_flags = flags;
info->mptcpi_token = READ_ONCE(msk->token);
info->mptcpi_write_seq = READ_ONCE(msk->write_seq);
info->mptcpi_snd_una = READ_ONCE(msk->snd_una);
info->mptcpi_rcv_nxt = READ_ONCE(msk->ack_seq);
info->mptcpi_csum_enabled = READ_ONCE(msk->csum_enabled);
mptcp_data_lock(sk);
info->mptcpi_snd_una = msk->snd_una;
info->mptcpi_rcv_nxt = msk->ack_seq;
info->mptcpi_bytes_acked = msk->bytes_acked;
mptcp_data_unlock(sk);
slow = lock_sock_fast(sk);
info->mptcpi_csum_enabled = msk->csum_enabled;
info->mptcpi_token = msk->token;
info->mptcpi_write_seq = msk->write_seq;
info->mptcpi_retransmits = inet_csk(sk)->icsk_retransmits;
info->mptcpi_bytes_sent = msk->bytes_sent;
info->mptcpi_bytes_received = msk->bytes_received;
info->mptcpi_bytes_retrans = msk->bytes_retrans;
unlock_sock_fast(sk, slow);
}
EXPORT_SYMBOL_GPL(mptcp_diag_fill_info);