From: ssmith@weybridge.uk.xensource.com <ssmith@weybridge.uk.xensource.com>
Date: Mon, 4 Sep 2006 15:38:24 +0000 (+0100)
Subject: Add support for netif frontends which don't support checksum offload.
X-Git-Tag: archive/raspbian/4.8.0-1+rpi1~1^2~15668^2~21
X-Git-Url: https://dgit.raspbian.org/%22http://www.example.com/cgi/success//%22http:/www.example.com/cgi/success/?a=commitdiff_plain;h=114411f240827cfc066e44e8255e44c9391bdb8b;p=xen.git

Add support for netif frontends which don't support checksum offload.

Signed-off-by: Steven Smith <sos22@cam.ac.uk>
---

diff --git a/linux-2.6-xen-sparse/drivers/xen/netback/xenbus.c b/linux-2.6-xen-sparse/drivers/xen/netback/xenbus.c
index a8b19a65be..6da614fc0c 100644
--- a/linux-2.6-xen-sparse/drivers/xen/netback/xenbus.c
+++ b/linux-2.6-xen-sparse/drivers/xen/netback/xenbus.c
@@ -427,6 +427,14 @@ static int connect_rings(struct backend_info *be)
 		be->netif->dev->features |= NETIF_F_TSO;
 	}
 
+	if (xenbus_scanf(XBT_NIL, dev->otherend, "feature-no-csum-offload",
+			 "%d", &val) < 0)
+		val = 0;
+	if (val) {
+		be->netif->features &= ~NETIF_F_IP_CSUM;
+		be->netif->dev->features &= ~NETIF_F_IP_CSUM;
+	}
+
 	/* Map the shared frame, irq etc. */
 	err = netif_map(be->netif, tx_ring_ref, rx_ring_ref, evtchn);
 	if (err) {