From: Jesse Gross <jesse@nicira.com>
Date: Thu, 1 Apr 2010 21:34:18 +0000 (-0400)
Subject: datapath: Add skb_csum_help compatibility function.
X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2d2a0e309f2464fd2cf77a328b15acc62cfc7c09;p=openvswitch

datapath: Add skb_csum_help compatibility function.

Later kernel versions remove the direction argument from
skb_checksum_help.  This provides a compatibility function so we
can have consistent syntax across versions.

Since CHECKSUM_PARTIAL is the same as CHECKSUM_HW on older kernels
this allows a unified code path for computing checksums.
---

diff --git a/datapath/datapath.c b/datapath/datapath.c
index 9b34fcc5..e1320f24 100644
--- a/datapath/datapath.c
+++ b/datapath/datapath.c
@@ -757,8 +757,9 @@ queue_control_packets(struct sk_buff *skb, struct sk_buff_head *queue,
 		err = vswitch_skb_checksum_setup(skb);
 		if (err)
 			goto err_kfree_skbs;
-#ifndef CHECKSUM_HW
+
 		if (skb->ip_summed == CHECKSUM_PARTIAL) {
+
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,22)
 			/* Until 2.6.22, the start of the transport header was
 			 * also the start of data to be checksummed.  Linux
@@ -769,17 +770,11 @@ queue_control_packets(struct sk_buff *skb, struct sk_buff_head *queue,
 			skb_set_transport_header(skb, skb->csum_start -
 						 skb_headroom(skb));
 #endif
+
 			err = skb_checksum_help(skb);
 			if (err)
 				goto err_kfree_skbs;
 		}
-#else
-		if (skb->ip_summed == CHECKSUM_HW) {
-			err = skb_checksum_help(skb, 0);
-			if (err)
-				goto err_kfree_skbs;
-		}
-#endif
 
 		err = skb_cow(skb, sizeof *header);
 		if (err)
diff --git a/datapath/linux-2.6/compat-2.6/include/linux/netdevice.h b/datapath/linux-2.6/compat-2.6/include/linux/netdevice.h
index 7080d012..b7fe8deb 100644
--- a/datapath/linux-2.6/compat-2.6/include/linux/netdevice.h
+++ b/datapath/linux-2.6/compat-2.6/include/linux/netdevice.h
@@ -85,4 +85,8 @@ dev_get_stats(struct net_device *dev)
 }
 #endif
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19)
+#define skb_checksum_help(skb) skb_checksum_help((skb), 0)
+#endif
+
 #endif