Move xen patchset to new version's subdir.

[people/teissler/ipfire-2.x.git] / src / patches / suse-2.6.27.31 / patches.xen / 764-netback-foreign-pages.patch

diff --git a/src/patches/suse-2.6.27.31/patches.xen/764-netback-foreign-pages.patch b/src/patches/suse-2.6.27.31/patches.xen/764-netback-foreign-pages.patch
new file mode 100644 (file)
index 0000000..58db1f6
--- /dev/null
+++ b/src/patches/suse-2.6.27.31/patches.xen/764-netback-foreign-pages.patch
@@ -0,0 +1,96 @@
+From: http://xenbits.xensource.com/linux-2.6.18-xen.hg?rev/618fc299e2f1
+# HG changeset 764 patch
+# User Keir Fraser <keir.fraser@citrix.com>
+# Date 1229601096 0
+# Node ID 618fc299e2f1e222686bc234c48ac70e1104e18d
+# Parent  ff9683032b76f533509191bb9532df10cbb9830b
+Subject: netback: handle non-netback foreign pages
+Patch-mainline: obsolete
+
+An SKB can contain pages which are foreign but not tracked by netback,
+such as those created by gnttab_copy_grant_page when in
+NETBK_DELAYED_COPY_SKB mode. These pages do not have a mapping field
+which points to a valid offset in the pending_tx_info array.
+
+Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
+Acked-by: jbeulich@novell.com
+
+--- head-2008-12-23.orig/drivers/xen/netback/netback.c 2008-12-01 11:25:57.000000000 +0100
++++ head-2008-12-23/drivers/xen/netback/netback.c      2008-12-23 09:31:07.000000000 +0100
+@@ -40,9 +40,6 @@
+ 
+ /*define NETBE_DEBUG_INTERRUPT*/
+ 
+-/* extra field used in struct page */
+-#define netif_page_index(pg) (*(long *)&(pg)->mapping)
+-
+ struct netbk_rx_meta {
+       skb_frag_t frag;
+       int id;
+@@ -89,6 +86,25 @@ static inline unsigned long idx_to_kaddr
+       return (unsigned long)pfn_to_kaddr(idx_to_pfn(idx));
+ }
+ 
++/* extra field used in struct page */
++static inline void netif_set_page_index(struct page *pg, unsigned int index)
++{
++      *(unsigned long *)&pg->mapping = index;
++}
++
++static inline int netif_page_index(struct page *pg)
++{
++      unsigned long idx = (unsigned long)pg->mapping;
++
++      if (!PageForeign(pg))
++              return -1;
++
++      if ((idx >= MAX_PENDING_REQS) || (mmap_pages[idx] != pg))
++              return -1;
++
++      return idx;
++}
++
+ #define PKT_PROT_LEN 64
+ 
+ static struct pending_tx_info {
+@@ -370,6 +386,7 @@ static u16 netbk_gop_frag(netif_t *netif
+       multicall_entry_t *mcl;
+       netif_rx_request_t *req;
+       unsigned long old_mfn, new_mfn;
++      int idx = netif_page_index(page);
+ 
+       old_mfn = virt_to_mfn(page_address(page));
+ 
+@@ -380,9 +397,8 @@ static u16 netbk_gop_frag(netif_t *netif
+               meta->copy = 1;
+               copy_gop = npo->copy + npo->copy_prod++;
+               copy_gop->flags = GNTCOPY_dest_gref;
+-              if (PageForeign(page)) {
+-                      struct pending_tx_info *src_pend =
+-                              &pending_tx_info[netif_page_index(page)];
++              if (idx > -1) {
++                      struct pending_tx_info *src_pend = &pending_tx_info[idx];
+                       copy_gop->source.domid = src_pend->netif->domid;
+                       copy_gop->source.u.ref = src_pend->req.gref;
+                       copy_gop->flags |= GNTCOPY_source_gref;
+@@ -1437,8 +1453,10 @@ static void netif_idx_release(u16 pendin
+ 
+ static void netif_page_release(struct page *page, unsigned int order)
+ {
++      int idx = netif_page_index(page);
+       BUG_ON(order);
+-      netif_idx_release(netif_page_index(page));
++      BUG_ON(idx < 0);
++      netif_idx_release(idx);
+ }
+ 
+ irqreturn_t netif_be_int(int irq, void *dev_id, struct pt_regs *regs)
+@@ -1572,7 +1590,7 @@ static int __init netback_init(void)
+       for (i = 0; i < MAX_PENDING_REQS; i++) {
+               page = mmap_pages[i];
+               SetPageForeign(page, netif_page_release);
+-              netif_page_index(page) = i;
++              netif_set_page_index(page, i);
+               INIT_LIST_HEAD(&pending_inuse[i].list);
+       }
+