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mptcp: optimize release_cb for the common case

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The mptcp release callback checks several flags in atomic
context, but only MPTCP_CLEAN_UNA can be up frequently.

Reorganize the code to avoid multiple conditionals in the
most common scenarios.

Additional clarify a related comment.

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 2022-04-08 12:45:54 -07:00 • committed by David S. Miller
parent 4696ad36d7
commit 65a569b03c
1 changed files with 9 additions and 7 deletions
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8
net/mptcp/protocol.c
View file

@ -3092,15 +3092,17 @@ static void mptcp_release_cb(struct sock *sk)
spin_lock_bh(&sk->sk_lock.slock);
}
if (__test_and_clear_bit(MPTCP_CLEAN_UNA, &msk->cb_flags))
__mptcp_clean_una_wakeup(sk);
if (unlikely(&msk->cb_flags)) {
/* be sure to set the current sk state before tacking actions
* depending on sk_state
* depending on sk_state, that is processing MPTCP_ERROR_REPORT
*/
if (__test_and_clear_bit(MPTCP_CONNECTED, &msk->cb_flags))
__mptcp_set_connected(sk);
if (__test_and_clear_bit(MPTCP_CLEAN_UNA, &msk->cb_flags))
__mptcp_clean_una_wakeup(sk);
if (__test_and_clear_bit(MPTCP_ERROR_REPORT, &msk->cb_flags))
__mptcp_error_report(sk);
}
__mptcp_update_rmem(sk);
}