mptcp: drop unneeded checks

After the previous patch subflow->conn is always != NULL and
is never changed. We can drop a bunch of now unneeded checks.

v1 -> v2:
 - rebased on top of commit 2398e3991bda ("mptcp: always
   include dack if possible.")

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Reviewed-by: Matthieu Baerts <matthieu.baerts@tessares.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/mptcp/options.c b/net/mptcp/options.c
index 9c71f42..63c8ee4 100644 (file)
--- a/net/mptcp/options.c
+++ b/net/mptcp/options.c
@@ -336,7 +336,6 @@ static bool mptcp_established_options_dss(struct sock *sk, struct sk_buff *skb,
        unsigned int ack_size;
        bool ret = false;
        bool can_ack;
-       u64 ack_seq;
        u8 tcp_fin;
 
        if (skb) {
@@ -368,16 +367,7 @@ static bool mptcp_established_options_dss(struct sock *sk, struct sk_buff *skb,
        can_ack = true;
        opts->ext_copy.use_ack = 0;
        msk = mptcp_sk(subflow->conn);
-       if (likely(msk && READ_ONCE(msk->can_ack))) {
-               ack_seq = msk->ack_seq;
-       } else if (subflow->can_ack) {
-               mptcp_crypto_key_sha(subflow->remote_key, NULL, &ack_seq);
-               ack_seq++;
-       } else {
-               can_ack = false;
-       }
-
-       if (unlikely(!can_ack)) {
+       if (!READ_ONCE(msk->can_ack)) {
                *size = ALIGN(dss_size, 4);
                return ret;
        }
@@ -390,7 +380,7 @@ static bool mptcp_established_options_dss(struct sock *sk, struct sk_buff *skb,
 
        dss_size += ack_size;
 
-       opts->ext_copy.data_ack = ack_seq;
+       opts->ext_copy.data_ack = msk->ack_seq;
        opts->ext_copy.ack64 = 1;
        opts->ext_copy.use_ack = 1;
 

diff --git a/net/mptcp/subflow.c b/net/mptcp/subflow.c
index 047b088..8434c7f 100644 (file)
--- a/net/mptcp/subflow.c
+++ b/net/mptcp/subflow.c
@@ -112,7 +112,7 @@ static void subflow_finish_connect(struct sock *sk, const struct sk_buff *skb)
 
        subflow->icsk_af_ops->sk_rx_dst_set(sk, skb);
 
-       if (subflow->conn && !subflow->conn_finished) {
+       if (!subflow->conn_finished) {
                pr_debug("subflow=%p, remote_key=%llu", mptcp_subflow_ctx(sk),
                         subflow->remote_key);
                mptcp_finish_connect(sk);
@@ -439,9 +439,6 @@ static bool subflow_check_data_avail(struct sock *ssk)
        if (subflow->data_avail)
                return true;
 
-       if (!subflow->conn)
-               return false;
-
        msk = mptcp_sk(subflow->conn);
        for (;;) {
                u32 map_remaining;
@@ -561,11 +558,10 @@ static void subflow_data_ready(struct sock *sk)
        struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
        struct sock *parent = subflow->conn;
 
-       if (!parent || !subflow->mp_capable) {
+       if (!subflow->mp_capable) {
                subflow->tcp_data_ready(sk);
 
-               if (parent)
-                       parent->sk_data_ready(parent);
+               parent->sk_data_ready(parent);
                return;
        }
 
@@ -579,7 +575,7 @@ static void subflow_write_space(struct sock *sk)
        struct sock *parent = subflow->conn;
 
        sk_stream_write_space(sk);
-       if (parent && sk_stream_is_writeable(sk)) {
+       if (sk_stream_is_writeable(sk)) {
                set_bit(MPTCP_SEND_SPACE, &mptcp_sk(parent)->flags);
                smp_mb__after_atomic();
                /* set SEND_SPACE before sk_stream_write_space clears NOSPACE */
@@ -694,7 +690,7 @@ static bool subflow_is_done(const struct sock *sk)
 static void subflow_state_change(struct sock *sk)
 {
        struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(sk);
-       struct sock *parent = READ_ONCE(subflow->conn);
+       struct sock *parent = subflow->conn;
 
        __subflow_state_change(sk);
 
@@ -702,10 +698,10 @@ static void subflow_state_change(struct sock *sk)
         * a fin packet carrying a DSS can be unnoticed if we don't trigger
         * the data available machinery here.
         */
-       if (parent && subflow->mp_capable && mptcp_subflow_data_available(sk))
+       if (subflow->mp_capable && mptcp_subflow_data_available(sk))
                mptcp_data_ready(parent, sk);
 
-       if (parent && !(parent->sk_shutdown & RCV_SHUTDOWN) &&
+       if (!(parent->sk_shutdown & RCV_SHUTDOWN) &&
            !subflow->rx_eof && subflow_is_done(sk)) {
                subflow->rx_eof = 1;
                parent->sk_shutdown |= RCV_SHUTDOWN;