From 2a892c7858883769188152a6140a955615da6bf8 Mon Sep 17 00:00:00 2001
From: Marcus Glocker <mglocker@cvs.openbsd.org>
Date: Sun, 31 Dec 2023 08:42:34 +0000
Subject: Add TCP Segmentation Offload (TSO) support for em(4).  Following
 chip-sets are currently known to support TSO;  82575, 82576, 82580, I350, and
 I210.

Suggested by claudio@.  Feedback and testing from many on tech@.

OK bluhm@
---
 sys/dev/pci/if_em.h | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to 'sys/dev/pci/if_em.h')

diff --git a/sys/dev/pci/if_em.h b/sys/dev/pci/if_em.h
index e79b46f3900..2115e9fd3d6 100644
--- a/sys/dev/pci/if_em.h
+++ b/sys/dev/pci/if_em.h
@@ -32,7 +32,7 @@ POSSIBILITY OF SUCH DAMAGE.
 ***************************************************************************/
 
 /* $FreeBSD: if_em.h,v 1.26 2004/09/01 23:22:41 pdeuskar Exp $ */
-/* $OpenBSD: if_em.h,v 1.80 2022/01/09 05:42:50 jsg Exp $ */
+/* $OpenBSD: if_em.h,v 1.81 2023/12/31 08:42:33 mglocker Exp $ */
 
 #ifndef _EM_H_DEFINED_
 #define _EM_H_DEFINED_
@@ -55,11 +55,14 @@ POSSIBILITY OF SUCH DAMAGE.
 
 #include <net/if.h>
 #include <net/if_media.h>
+#include <net/route.h>
 
 #include <netinet/in.h>
 #include <netinet/ip.h>
 #include <netinet/if_ether.h>
 #include <netinet/tcp.h>
+#include <netinet/tcp_timer.h>
+#include <netinet/tcp_var.h>
 #include <netinet/udp.h>
 
 #if NBPFILTER > 0
@@ -269,6 +272,7 @@ typedef int	boolean_t;
 
 #define EM_MAX_SCATTER		64
 #define EM_TSO_SIZE		65535
+#define EM_TSO_SEG_SIZE		4096	/* Max dma segment size */
 
 struct em_packet {
 	int		 pkt_eop;	/* Index of the desc to watch */
-- 
cgit v1.2.3