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mptcp: implement memory accounting for mptcp rtx queue 

Charge the data on the rtx queue to the master MPTCP socket, too.
Such memory in uncharged when the data is acked/dequeued.

Also account mptcp sockets inuse via a protocol specific pcpu
counter.

Co-developed-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
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:
Paolo Abeni 2020-03-27 14:48:45 -07:00 committed by David S. Miller
parent b51f9b80c0
commit d027236c41
1 changed files with 39 additions and 3 deletions
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42
net/mptcp/protocol.c
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@ -37,6 +37,8 @@ struct mptcp_skb_cb {
#define MPTCP_SKB_CB(__skb) ((struct mptcp_skb_cb *)&((__skb)->cb[0]))
static struct percpu_counter mptcp_sockets_allocated;
/* If msk has an initial subflow socket, and the MP_CAPABLE handshake has not
* completed yet or has failed, return the subflow socket.
* Otherwise return NULL.
@ -333,9 +335,17 @@ static bool mptcp_frag_can_collapse_to(const struct mptcp_sock *msk,
df->data_seq + df->data_len == msk->write_seq;
}
static void dfrag_clear(struct mptcp_data_frag *dfrag)
static void dfrag_uncharge(struct sock *sk, int len)
{
sk_mem_uncharge(sk, len);
}
static void dfrag_clear(struct sock *sk, struct mptcp_data_frag *dfrag)
{
int len = dfrag->data_len + dfrag->overhead;
list_del(&dfrag->list);
dfrag_uncharge(sk, len);
put_page(dfrag->page);
}
@ -344,12 +354,18 @@ static void mptcp_clean_una(struct sock *sk)
struct mptcp_sock *msk = mptcp_sk(sk);
struct mptcp_data_frag *dtmp, *dfrag;
u64 snd_una = atomic64_read(&msk->snd_una);
bool cleaned = false;
list_for_each_entry_safe(dfrag, dtmp, &msk->rtx_queue, list) {
if (after64(dfrag->data_seq + dfrag->data_len, snd_una))
break;
dfrag_clear(dfrag);
dfrag_clear(sk, dfrag);
cleaned = true;
}
if (cleaned) {
sk_mem_reclaim_partial(sk);
}
}
@ -461,6 +477,9 @@ static int mptcp_sendmsg_frag(struct sock *sk, struct sock *ssk,
if (!psize)
return -EINVAL;
if (!sk_wmem_schedule(sk, psize + dfrag->overhead))
return -ENOMEM;
/* tell the TCP stack to delay the push so that we can safely
* access the skb after the sendpages call
*/
@ -482,6 +501,11 @@ static int mptcp_sendmsg_frag(struct sock *sk, struct sock *ssk,
list_add_tail(&dfrag->list, &msk->rtx_queue);
}
/* charge data on mptcp rtx queue to the master socket
* Note: we charge such data both to sk and ssk
*/
sk->sk_forward_alloc -= frag_truesize;
/* if the tail skb extension is still the cached one, collapsing
* really happened. Note: we can't check for 'same skb' as the sk_buff
* hdr on tail can be transmitted, freed and re-allocated by the
@ -933,6 +957,8 @@ static int mptcp_init_sock(struct sock *sk)
if (ret)
return ret;
sk_sockets_allocated_inc(sk);
if (!mptcp_is_enabled(sock_net(sk)))
return -ENOPROTOOPT;
@ -947,7 +973,7 @@ static void __mptcp_clear_xmit(struct sock *sk)
sk_stop_timer(sk, &msk->sk.icsk_retransmit_timer);
list_for_each_entry_safe(dfrag, dtmp, &msk->rtx_queue, list)
dfrag_clear(dfrag);
dfrag_clear(sk, dfrag);
}
static void mptcp_cancel_work(struct sock *sk)
@ -1182,6 +1208,8 @@ static void mptcp_destroy(struct sock *sk)
if (msk->cached_ext)
__skb_ext_put(msk->cached_ext);
sk_sockets_allocated_dec(sk);
}
static int mptcp_setsockopt(struct sock *sk, int level, int optname,
@ -1391,7 +1419,12 @@ static struct proto mptcp_prot = {
.hash = inet_hash,
.unhash = inet_unhash,
.get_port = mptcp_get_port,
.sockets_allocated = &mptcp_sockets_allocated,
.memory_allocated = &tcp_memory_allocated,
.memory_pressure = &tcp_memory_pressure,
.stream_memory_free = mptcp_memory_free,
.sysctl_wmem_offset = offsetof(struct net, ipv4.sysctl_tcp_wmem),
.sysctl_mem = sysctl_tcp_mem,
.obj_size = sizeof(struct mptcp_sock),
.no_autobind = true,
};
@ -1680,6 +1713,9 @@ void mptcp_proto_init(void)
{
mptcp_prot.h.hashinfo = tcp_prot.h.hashinfo;
if (percpu_counter_init(&mptcp_sockets_allocated, 0, GFP_KERNEL))
panic("Failed to allocate MPTCP pcpu counter\n");
mptcp_subflow_init();
mptcp_pm_init();