CVSROOT: /cvs
Module name: src
Changes by: d...@cvs.openbsd.org 2025/06/16 19:35:07
Modified files:
sys/netinet : tcp_var.h
Log message:
guard tcp stat updates with splnet now that interrupts can update them.
some tcp stack lso/tso statistics are now updated by drivers that
implement tso/lro, and this code can run from an interrupt handler.
eg, ifq_restart from a transmit completion interrupt can call a
drivers start routine, which can preempt the tcp stack running on
behalf of a system call.
the tcp stats are per cpu counters so they can be updated without
coordinating with each other, but, as per the counters manpage,
updates on a cpu have to be serialised. this is to prevent corruption
of at least the generation number each cpu uses to version the
counter updates. since all the tcp stats are a single set of counters,
any update has to prevent preemption.
ok claudio@ bluhm@
