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authorPaolo Abeni <pabeni@redhat.com>2022-09-30 08:59:34 -0700
committerDavid S. Miller <davem@davemloft.net>2022-10-03 11:18:53 +0100
commitd89e3ed76b6efd1a4fd213feebedd01337a16b5a (patch)
treecf284e0bc9d9ff4b14030dedb26c4fbc993ae858 /net
parent6bf41020b72b1c5ab96acc309a135153abbe20c8 (diff)
downloadlinux-d89e3ed76b6efd1a4fd213feebedd01337a16b5a.tar.bz2
mptcp: update misleading comments.
The MPTCP data path is quite complex and hard to understend even without some foggy comments referring to modified code and/or completely misleading from the beginning. Update a few of them to more accurately describing the current status. Reviewed-by: Mat Martineau <mathew.j.martineau@linux.intel.com> 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>
Diffstat (limited to 'net')
-rw-r--r--net/mptcp/protocol.c14
1 files changed, 7 insertions, 7 deletions
diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index acf44075ba40..f599ad44ed24 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -662,9 +662,9 @@ static bool __mptcp_move_skbs_from_subflow(struct mptcp_sock *msk,
skb = skb_peek(&ssk->sk_receive_queue);
if (!skb) {
- /* if no data is found, a racing workqueue/recvmsg
- * already processed the new data, stop here or we
- * can enter an infinite loop
+ /* With racing move_skbs_to_msk() and __mptcp_move_skbs(),
+ * a different CPU can have already processed the pending
+ * data, stop here or we can enter an infinite loop
*/
if (!moved)
done = true;
@@ -672,9 +672,9 @@ static bool __mptcp_move_skbs_from_subflow(struct mptcp_sock *msk,
}
if (__mptcp_check_fallback(msk)) {
- /* if we are running under the workqueue, TCP could have
- * collapsed skbs between dummy map creation and now
- * be sure to adjust the size
+ /* Under fallback skbs have no MPTCP extension and TCP could
+ * collapse them between the dummy map creation and the
+ * current dequeue. Be sure to adjust the map size.
*/
map_remaining = skb->len;
subflow->map_data_len = skb->len;
@@ -3768,7 +3768,7 @@ static __poll_t mptcp_poll(struct file *file, struct socket *sock,
if (sk->sk_shutdown & RCV_SHUTDOWN)
mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP;
- /* This barrier is coupled with smp_wmb() in tcp_reset() */
+ /* This barrier is coupled with smp_wmb() in __mptcp_error_report() */
smp_rmb();
if (sk->sk_err)
mask |= EPOLLERR;