xen: netfront: convert to SKB paged frag API.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Cc: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: xen-devel@lists.xensource.com
Cc: netdev@vger.kernel.org
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 19 insertions, 15 deletions

diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
index d7c8a98daff6..6e5d4c09e5d7 100644
--- a/drivers/net/xen-netfront.c
+++ b/drivers/net/xen-netfront.c
@@ -275,7 +275,7 @@ no_skb:
                         break;
                 }
 
-                skb_shinfo(skb)->frags[0].page = page;
+                __skb_fill_page_desc(skb, 0, page, 0, 0);
                 skb_shinfo(skb)->nr_frags = 1;
                 __skb_queue_tail(&np->rx_batch, skb);
         }
@@ -309,8 +309,8 @@ no_skb:
                 BUG_ON((signed short)ref < 0);
                 np->grant_rx_ref[id] = ref;
 
-                pfn = page_to_pfn(skb_shinfo(skb)->frags[0].page);
-                vaddr = page_address(skb_shinfo(skb)->frags[0].page);
+                pfn = page_to_pfn(skb_frag_page(&skb_shinfo(skb)->frags[0]));
+                vaddr = page_address(skb_frag_page(&skb_shinfo(skb)->frags[0]));
 
                 req = RING_GET_REQUEST(&np->rx, req_prod + i);
                 gnttab_grant_foreign_access_ref(ref,
@@ -461,7 +461,7 @@ static void xennet_make_frags(struct sk_buff *skb, struct net_device *dev,
                 ref = gnttab_claim_grant_reference(&np->gref_tx_head);
                 BUG_ON((signed short)ref < 0);
 
-                mfn = pfn_to_mfn(page_to_pfn(frag->page));
+                mfn = pfn_to_mfn(page_to_pfn(skb_frag_page(frag)));
                 gnttab_grant_foreign_access_ref(ref, np->xbdev->otherend_id,
                                                 mfn, GNTMAP_readonly);
 
@@ -762,23 +762,22 @@ static RING_IDX xennet_fill_frags(struct netfront_info *np,
         struct skb_shared_info *shinfo = skb_shinfo(skb);
         int nr_frags = shinfo->nr_frags;
         RING_IDX cons = np->rx.rsp_cons;
-        skb_frag_t *frag = shinfo->frags + nr_frags;
         struct sk_buff *nskb;
 
         while ((nskb = __skb_dequeue(list))) {
                 struct xen_netif_rx_response *rx =
                         RING_GET_RESPONSE(&np->rx, ++cons);
+                skb_frag_t *nfrag = &skb_shinfo(nskb)->frags[0];
 
-                frag->page = skb_shinfo(nskb)->frags[0].page;
-                frag->page_offset = rx->offset;
-                frag->size = rx->status;
+                __skb_fill_page_desc(skb, nr_frags,
+                                     skb_frag_page(nfrag),
+                                     rx->offset, rx->status);
 
                 skb->data_len += rx->status;
 
                 skb_shinfo(nskb)->nr_frags = 0;
                 kfree_skb(nskb);
 
-                frag++;
                 nr_frags++;
         }
 
@@ -873,7 +872,7 @@ static int handle_incoming_queue(struct net_device *dev,
                 memcpy(skb->data, vaddr + offset,
                        skb_headlen(skb));
 
-                if (page != skb_shinfo(skb)->frags[0].page)
+                if (page != skb_frag_page(&skb_shinfo(skb)->frags[0]))
                         __free_page(page);
 
                 /* Ethernet work: Delayed to here as it peeks the header. */
@@ -954,7 +953,8 @@ err:
                         }
                 }
 
-                NETFRONT_SKB_CB(skb)->page = skb_shinfo(skb)->frags[0].page;
+                NETFRONT_SKB_CB(skb)->page =
+                        skb_frag_page(&skb_shinfo(skb)->frags[0]);
                 NETFRONT_SKB_CB(skb)->offset = rx->offset;
 
                 len = rx->status;
@@ -968,7 +968,7 @@ err:
                         skb_shinfo(skb)->frags[0].size = rx->status - len;
                         skb->data_len = rx->status - len;
                 } else {
-                        skb_shinfo(skb)->frags[0].page = NULL;
+                        __skb_fill_page_desc(skb, 0, NULL, 0, 0);
                         skb_shinfo(skb)->nr_frags = 0;
                 }
 
@@ -1143,7 +1143,8 @@ static void xennet_release_rx_bufs(struct netfront_info *np)
 
                 if (!xen_feature(XENFEAT_auto_translated_physmap)) {
                         /* Remap the page. */
-                        struct page *page = skb_shinfo(skb)->frags[0].page;
+                        const struct page *page =
+                                skb_frag_page(&skb_shinfo(skb)->frags[0]);
                         unsigned long pfn = page_to_pfn(page);
                         void *vaddr = page_address(page);
 
@@ -1650,6 +1651,8 @@ static int xennet_connect(struct net_device *dev)
 
         /* Step 2: Rebuild the RX buffer freelist and the RX ring itself. */
         for (requeue_idx = 0, i = 0; i < NET_RX_RING_SIZE; i++) {
+                skb_frag_t *frag;
+                const struct page *page;
                 if (!np->rx_skbs[i])
                         continue;
 
@@ -1657,10 +1660,11 @@ static int xennet_connect(struct net_device *dev)
                 ref = np->grant_rx_ref[requeue_idx] = xennet_get_rx_ref(np, i);
                 req = RING_GET_REQUEST(&np->rx, requeue_idx);
 
+                frag = &skb_shinfo(skb)->frags[0];
+                page = skb_frag_page(frag);
                 gnttab_grant_foreign_access_ref(
                         ref, np->xbdev->otherend_id,
-                        pfn_to_mfn(page_to_pfn(skb_shinfo(skb)->
-                                               frags->page)),
+                        pfn_to_mfn(page_to_pfn(page)),
                         0);
                 req->gref = ref;
                 req->id   = requeue_idx;