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tcp: annotate sk->sk_rcvbuf lockless reads
For the sake of tcp_poll(), there are few places where we fetch sk->sk_rcvbuf while this field can change from IRQ or other cpu. We need to add READ_ONCE() annotations, and also make sure write sides use corresponding WRITE_ONCE() to avoid store-tearing. Note that other transports probably need similar fixes. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -1380,14 +1380,14 @@ static inline int tcp_win_from_space(const struct sock *sk, int space)
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/* Note: caller must be prepared to deal with negative returns */
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static inline int tcp_space(const struct sock *sk)
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{
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return tcp_win_from_space(sk, sk->sk_rcvbuf -
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return tcp_win_from_space(sk, READ_ONCE(sk->sk_rcvbuf) -
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READ_ONCE(sk->sk_backlog.len) -
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atomic_read(&sk->sk_rmem_alloc));
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}
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static inline int tcp_full_space(const struct sock *sk)
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{
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return tcp_win_from_space(sk, sk->sk_rcvbuf);
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return tcp_win_from_space(sk, READ_ONCE(sk->sk_rcvbuf));
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}
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extern void tcp_openreq_init_rwin(struct request_sock *req,
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@ -82,7 +82,7 @@ TRACE_EVENT(sock_rcvqueue_full,
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TP_fast_assign(
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__entry->rmem_alloc = atomic_read(&sk->sk_rmem_alloc);
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__entry->truesize = skb->truesize;
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__entry->sk_rcvbuf = sk->sk_rcvbuf;
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__entry->sk_rcvbuf = READ_ONCE(sk->sk_rcvbuf);
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),
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TP_printk("rmem_alloc=%d truesize=%u sk_rcvbuf=%d",
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@ -4252,7 +4252,8 @@ BPF_CALL_5(bpf_setsockopt, struct bpf_sock_ops_kern *, bpf_sock,
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case SO_RCVBUF:
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val = min_t(u32, val, sysctl_rmem_max);
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sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
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sk->sk_rcvbuf = max_t(int, val * 2, SOCK_MIN_RCVBUF);
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WRITE_ONCE(sk->sk_rcvbuf,
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max_t(int, val * 2, SOCK_MIN_RCVBUF));
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break;
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case SO_SNDBUF:
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val = min_t(u32, val, sysctl_wmem_max);
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@ -4415,7 +4415,7 @@ static void skb_set_err_queue(struct sk_buff *skb)
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int sock_queue_err_skb(struct sock *sk, struct sk_buff *skb)
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{
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if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >=
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(unsigned int)sk->sk_rcvbuf)
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(unsigned int)READ_ONCE(sk->sk_rcvbuf))
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return -ENOMEM;
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skb_orphan(skb);
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@ -831,7 +831,8 @@ set_rcvbuf:
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* returning the value we actually used in getsockopt
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* is the most desirable behavior.
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*/
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sk->sk_rcvbuf = max_t(int, val * 2, SOCK_MIN_RCVBUF);
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WRITE_ONCE(sk->sk_rcvbuf,
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max_t(int, val * 2, SOCK_MIN_RCVBUF));
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break;
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case SO_RCVBUFFORCE:
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@ -3204,7 +3205,7 @@ void sk_get_meminfo(const struct sock *sk, u32 *mem)
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memset(mem, 0, sizeof(*mem) * SK_MEMINFO_VARS);
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mem[SK_MEMINFO_RMEM_ALLOC] = sk_rmem_alloc_get(sk);
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mem[SK_MEMINFO_RCVBUF] = sk->sk_rcvbuf;
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mem[SK_MEMINFO_RCVBUF] = READ_ONCE(sk->sk_rcvbuf);
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mem[SK_MEMINFO_WMEM_ALLOC] = sk_wmem_alloc_get(sk);
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mem[SK_MEMINFO_SNDBUF] = sk->sk_sndbuf;
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mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc;
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@ -451,7 +451,7 @@ void tcp_init_sock(struct sock *sk)
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icsk->icsk_sync_mss = tcp_sync_mss;
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sk->sk_sndbuf = sock_net(sk)->ipv4.sysctl_tcp_wmem[1];
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sk->sk_rcvbuf = sock_net(sk)->ipv4.sysctl_tcp_rmem[1];
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WRITE_ONCE(sk->sk_rcvbuf, sock_net(sk)->ipv4.sysctl_tcp_rmem[1]);
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sk_sockets_allocated_inc(sk);
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sk->sk_route_forced_caps = NETIF_F_GSO;
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@ -1711,7 +1711,7 @@ int tcp_set_rcvlowat(struct sock *sk, int val)
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val <<= 1;
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if (val > sk->sk_rcvbuf) {
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sk->sk_rcvbuf = val;
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WRITE_ONCE(sk->sk_rcvbuf, val);
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tcp_sk(sk)->window_clamp = tcp_win_from_space(sk, val);
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}
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return 0;
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@ -483,8 +483,9 @@ static void tcp_clamp_window(struct sock *sk)
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!(sk->sk_userlocks & SOCK_RCVBUF_LOCK) &&
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!tcp_under_memory_pressure(sk) &&
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sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0)) {
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sk->sk_rcvbuf = min(atomic_read(&sk->sk_rmem_alloc),
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net->ipv4.sysctl_tcp_rmem[2]);
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WRITE_ONCE(sk->sk_rcvbuf,
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min(atomic_read(&sk->sk_rmem_alloc),
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net->ipv4.sysctl_tcp_rmem[2]));
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}
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if (atomic_read(&sk->sk_rmem_alloc) > sk->sk_rcvbuf)
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tp->rcv_ssthresh = min(tp->window_clamp, 2U * tp->advmss);
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@ -648,7 +649,7 @@ void tcp_rcv_space_adjust(struct sock *sk)
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rcvbuf = min_t(u64, rcvwin * rcvmem,
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sock_net(sk)->ipv4.sysctl_tcp_rmem[2]);
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if (rcvbuf > sk->sk_rcvbuf) {
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sk->sk_rcvbuf = rcvbuf;
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WRITE_ONCE(sk->sk_rcvbuf, rcvbuf);
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/* Make the window clamp follow along. */
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tp->window_clamp = tcp_win_from_space(sk, rcvbuf);
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