if stoeplitz is enabled, use it to provide a flowid for tcp packets.

drivers that implement rss and multiple rings depend on the symmetric
toeplitz code, and use it to generate a key that decides with rx
ring a packet lands on. if the toeplitz code is enabled, this diff
has the pcb and tcp layer use the toeplitz code to generate a flowid
for packets they send, which in turn is used to pick a tx ring.
because the nic and the stack use the same key, the tx and rx sides
end up with the same hash/flowid. at the very least this means that
the same rx and tx queue pair on a particular nic are used for both
sides of the connection. as the stack becomes more parallel, it
will also help keep both sides of the tcp connection processing in
the one place.

1 files changed, 2 insertions, 1 deletions

diff --git a/sys/netinet/in_pcb.h b/sys/netinet/in_pcb.h
index 4c7ae3fd18f..2f87c820f7f 100644
--- a/sys/netinet/in_pcb.h
+++ b/sys/netinet/in_pcb.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: in_pcb.h,v 1.120 2020/06/21 05:14:04 dlg Exp $	*/
+/*	$OpenBSD: in_pcb.h,v 1.121 2021/01/25 03:40:46 dlg Exp $	*/
 /*	$NetBSD: in_pcb.h,v 1.14 1996/02/13 23:42:00 christos Exp $	*/
 
 /*
@@ -148,6 +148,7 @@ struct inpcb {
 	void	*inp_upcall_arg;
 	u_int	inp_rtableid;
 	int	inp_pipex;		/* pipex indication */
+	uint16_t inp_flowid;
 };
 
 LIST_HEAD(inpcbhead, inpcb);