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authorStefano Brivio <sbrivio@redhat.com>2022-03-18 12:18:19 +0100
committerStefano Brivio <sbrivio@redhat.com>2022-03-29 15:35:38 +0200
commitbe5bbb9b06811b98f677460fd2b89001db580582 (patch)
tree51bdd9b9e918649776806605436fc2bde3878810 /passt.h
parent3eb19cfd8a7c03920aeecae6692048429288af88 (diff)
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tcp: Rework timers to use timerfd instead of periodic bitmap scan
With a lot of concurrent connections, the bitmap scan approach is not really sustainable. Switch to per-connection timerfd timers, set based on events and on two new flags, ACK_FROM_TAP_DUE and ACK_TO_TAP_DUE. Timers are added to the common epoll list, and implement the existing timeouts. While at it, drop the CONN_ prefix from flag names, otherwise they get quite long, and fix the logic to decide if a connection has a local, possibly unreachable endpoint: we shouldn't go through the rest of tcp_conn_from_tap() if we reset the connection due to a successful bind(2), and we'll get EACCES if the port number is low. Suggested by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
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