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File 0004-e1000-secrc-support.patch of Package xen

From: "Michael S. Tsirkin" <mst@redhat.com>
Date: Mon, 12 Jul 2010 20:41:02 +0300
Subject: e1000: secrc support
Patch-mainline: v0.13.0-rc0
Git-commit: 55e8d1ce6b09300cc5f3adcd9a705156d168381d
References: bnc#840196

Add support for secrc field. Reportedly needed by old RHEL guests.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Michal Kubecek <mkubecek@suse.cz>
---
 tools/qemu-xen-traditional-dir-remote/hw/e1000.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/tools/qemu-xen-traditional-dir-remote/hw/e1000.c b/tools/qemu-xen-traditional-dir-remote/hw/e1000.c
index 9b062db..07e681d 100644
--- a/tools/qemu-xen-traditional-dir-remote/hw/e1000.c
+++ b/tools/qemu-xen-traditional-dir-remote/hw/e1000.c
@@ -338,6 +338,15 @@ is_vlan_txd(uint32_t txd_lower)
     return ((txd_lower & E1000_TXD_CMD_VLE) != 0);
 }
 
+/* FCS aka Ethernet CRC-32. We don't get it from backends and can't
+ * fill it in, just pad descriptor length by 4 bytes unless guest
+ * told us to trip it off the packet. */
+static inline int
+fcs_len(E1000State *s)
+{
+    return (s->mac_reg[RCTL] & E1000_RCTL_SECRC) ? 0 : 4;
+}
+
 static void
 xmit_seg(E1000State *s)
 {
@@ -672,7 +681,7 @@ e1000_receive(void *opaque, const uint8_t *buf, int size)
         if (desc.buffer_addr) {
             cpu_physical_memory_write(le64_to_cpu(desc.buffer_addr),
                                       (void *)(buf + vlan_offset), size);
-            desc.length = cpu_to_le16(size + 4 /* for FCS */);
+            desc.length = cpu_to_le16(size + fcs_len(s));
             desc.status |= E1000_RXD_STAT_EOP|E1000_RXD_STAT_IXSM;
         } else // as per intel docs; skip descriptors with null buf addr
             DBGOUT(RX, "Null RX descriptor!!\n");
-- 
1.8.1.4