[Xen-changelog] [xen-unstable] [NET] back: Fix inter-domain networking when using rx-copy path.

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User kfraser@xxxxxxxxxxxxxxxxxxxxx
# Node ID bd2be8a8fc7286f44d9fbde172e4a1bacf5cc739
# Parent  fe54ba10e9ef8f1e7e7c8013e19c83e5c8b10c7d
[NET] back: Fix inter-domain networking when using rx-copy path.
Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>
---
 linux-2.6-xen-sparse/drivers/xen/netback/netback.c |   16 ++++++++++++----
 1 files changed, 12 insertions(+), 4 deletions(-)

diff -r fe54ba10e9ef -r bd2be8a8fc72 
linux-2.6-xen-sparse/drivers/xen/netback/netback.c
--- a/linux-2.6-xen-sparse/drivers/xen/netback/netback.c        Thu Oct 12 
10:38:45 2006 +0100
+++ b/linux-2.6-xen-sparse/drivers/xen/netback/netback.c        Thu Oct 12 
10:56:41 2006 +0100
@@ -78,7 +78,7 @@ static inline unsigned long idx_to_kaddr
 
 #define PKT_PROT_LEN 64
 
-static struct {
+static struct pending_tx_info {
        netif_tx_request_t req;
        netif_t *netif;
 } pending_tx_info[MAX_PENDING_REQS];
@@ -374,14 +374,22 @@ static u16 netbk_gop_frag(netif_t *netif
                   flipped. */
                meta->copy = 1;
                copy_gop = npo->copy + npo->copy_prod++;
-               copy_gop->source.domid = DOMID_SELF;
+               copy_gop->flags = GNTCOPY_dest_gref;
+               if (PageForeign(page)) {
+                       struct pending_tx_info *src_pend =
+                               &pending_tx_info[page->index];
+                       copy_gop->source.domid = src_pend->netif->domid;
+                       copy_gop->source.u.ref = src_pend->req.gref;
+                       copy_gop->flags |= GNTCOPY_source_gref;
+               } else {
+                       copy_gop->source.domid = DOMID_SELF;
+                       copy_gop->source.u.gmfn = old_mfn;
+               }
                copy_gop->source.offset = offset;
-               copy_gop->source.u.gmfn = old_mfn;
                copy_gop->dest.domid = netif->domid;
                copy_gop->dest.offset = 0;
                copy_gop->dest.u.ref = req->gref;
                copy_gop->len = size;
-               copy_gop->flags = GNTCOPY_dest_gref;
        } else {
                meta->copy = 0;
                if (!xen_feature(XENFEAT_auto_translated_physmap)) {

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