WARNING - OLD ARCHIVES

This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-devel

[Xen-devel] [PATCH 3/6] net: xen-netback: use API provided by xenbus mod

To: xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-devel] [PATCH 3/6] net: xen-netback: use API provided by xenbus module to map rings
From: David Vrabel <david.vrabel@xxxxxxxxxx>
Date: Thu, 15 Sep 2011 13:40:08 +0100
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, David Vrabel <david.vrabel@xxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, Ian Campbell <ian.campbell@xxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Delivery-date: Thu, 15 Sep 2011 05:43:43 -0700
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to: <1316090411-22608-1-git-send-email-david.vrabel@xxxxxxxxxx>
List-help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id: Xen developer discussion <xen-devel.lists.xensource.com>
List-post: <mailto:xen-devel@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
References: <1316090411-22608-1-git-send-email-david.vrabel@xxxxxxxxxx>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
From: David Vrabel <david.vrabel@xxxxxxxxxx>

The xenbus module provides xenbus_map_ring_page() and
xenbus_map_ring_page().  Use these to map the ring pages granted by
the frontend.

Signed-off-by: David Vrabel <david.vrabel@xxxxxxxxxx>
Cc: Ian Campbell <ian.campbell@xxxxxxxxxx>
---
 drivers/net/xen-netback/common.h  |   13 +++---
 drivers/net/xen-netback/netback.c |   79 +++++++-----------------------------
 2 files changed, 23 insertions(+), 69 deletions(-)

diff --git a/drivers/net/xen-netback/common.h b/drivers/net/xen-netback/common.h
index 161f207..05e0a8e 100644
--- a/drivers/net/xen-netback/common.h
+++ b/drivers/net/xen-netback/common.h
@@ -58,10 +58,6 @@ struct xenvif {
        u8               fe_dev_addr[6];
 
        /* Physical parameters of the comms window. */
-       grant_handle_t   tx_shmem_handle;
-       grant_ref_t      tx_shmem_ref;
-       grant_handle_t   rx_shmem_handle;
-       grant_ref_t      rx_shmem_ref;
        unsigned int     irq;
 
        /* List of frontends to notify after a batch of frames sent. */
@@ -70,8 +66,8 @@ struct xenvif {
        /* The shared rings and indexes. */
        struct xen_netif_tx_back_ring tx;
        struct xen_netif_rx_back_ring rx;
-       struct vm_struct *tx_comms_area;
-       struct vm_struct *rx_comms_area;
+       struct page *tx_ring_page;
+       struct page *rx_ring_page;
 
        /* Frontend feature information. */
        u8 can_sg:1;
@@ -106,6 +102,11 @@ struct xenvif {
        wait_queue_head_t waiting_to_free;
 };
 
+static inline struct xenbus_device *xenvif_to_xenbus_device(struct xenvif *vif)
+{
+       return to_xenbus_device(vif->dev->dev.parent);
+}
+
 #define XEN_NETIF_TX_RING_SIZE __CONST_RING_SIZE(xen_netif_tx, PAGE_SIZE)
 #define XEN_NETIF_RX_RING_SIZE __CONST_RING_SIZE(xen_netif_rx, PAGE_SIZE)
 
diff --git a/drivers/net/xen-netback/netback.c 
b/drivers/net/xen-netback/netback.c
index fd00f25..2a017b28 100644
--- a/drivers/net/xen-netback/netback.c
+++ b/drivers/net/xen-netback/netback.c
@@ -1577,88 +1577,41 @@ static int xen_netbk_kthread(void *data)
 
 void xen_netbk_unmap_frontend_rings(struct xenvif *vif)
 {
-       struct gnttab_unmap_grant_ref op;
-
-       if (vif->tx.sring) {
-               gnttab_set_unmap_op(&op, (unsigned 
long)vif->tx_comms_area->addr,
-                                   GNTMAP_host_map, vif->tx_shmem_handle);
-
-               if (HYPERVISOR_grant_table_op(GNTTABOP_unmap_grant_ref, &op, 1))
-                       BUG();
-       }
-
-       if (vif->rx.sring) {
-               gnttab_set_unmap_op(&op, (unsigned 
long)vif->rx_comms_area->addr,
-                                   GNTMAP_host_map, vif->rx_shmem_handle);
-
-               if (HYPERVISOR_grant_table_op(GNTTABOP_unmap_grant_ref, &op, 1))
-                       BUG();
-       }
-       if (vif->rx_comms_area)
-               free_vm_area(vif->rx_comms_area);
-       if (vif->tx_comms_area)
-               free_vm_area(vif->tx_comms_area);
+       if (vif->tx.sring)
+               xenbus_unmap_ring_page(xenvif_to_xenbus_device(vif),
+                                      vif->tx_ring_page);
+       if (vif->rx.sring)
+               xenbus_unmap_ring_page(xenvif_to_xenbus_device(vif),
+                                      vif->rx_ring_page);
 }
 
 int xen_netbk_map_frontend_rings(struct xenvif *vif,
                                 grant_ref_t tx_ring_ref,
                                 grant_ref_t rx_ring_ref)
 {
-       struct gnttab_map_grant_ref op;
        struct xen_netif_tx_sring *txs;
        struct xen_netif_rx_sring *rxs;
 
        int err = -ENOMEM;
 
-       vif->tx_comms_area = alloc_vm_area(PAGE_SIZE);
-       if (vif->tx_comms_area == NULL)
+       err = xenbus_map_ring_page(xenvif_to_xenbus_device(vif),
+                                  tx_ring_ref, &vif->tx_ring_page);
+       if (err)
                goto err;
 
-       vif->rx_comms_area = alloc_vm_area(PAGE_SIZE);
-       if (vif->rx_comms_area == NULL)
-               goto err;
-
-       gnttab_set_map_op(&op, (unsigned long)vif->tx_comms_area->addr,
-                         GNTMAP_host_map, tx_ring_ref, vif->domid);
-
-       if (HYPERVISOR_grant_table_op(GNTTABOP_map_grant_ref, &op, 1))
-               BUG();
-
-       if (op.status) {
-               netdev_warn(vif->dev,
-                           "failed to map tx ring. err=%d status=%d\n",
-                           err, op.status);
-               err = op.status;
-               goto err;
-       }
-
-       vif->tx_shmem_ref    = tx_ring_ref;
-       vif->tx_shmem_handle = op.handle;
-
-       txs = (struct xen_netif_tx_sring *)vif->tx_comms_area->addr;
+       txs = page_address(vif->tx_ring_page);
        BACK_RING_INIT(&vif->tx, txs, PAGE_SIZE);
 
-       gnttab_set_map_op(&op, (unsigned long)vif->rx_comms_area->addr,
-                         GNTMAP_host_map, rx_ring_ref, vif->domid);
-
-       if (HYPERVISOR_grant_table_op(GNTTABOP_map_grant_ref, &op, 1))
-               BUG();
-
-       if (op.status) {
-               netdev_warn(vif->dev,
-                           "failed to map rx ring. err=%d status=%d\n",
-                           err, op.status);
-               err = op.status;
+       err = xenbus_map_ring_page(xenvif_to_xenbus_device(vif),
+                                  rx_ring_ref, &vif->rx_ring_page);
+       if (err)
                goto err;
-       }
-
-       vif->rx_shmem_ref     = rx_ring_ref;
-       vif->rx_shmem_handle  = op.handle;
-       vif->rx_req_cons_peek = 0;
 
-       rxs = (struct xen_netif_rx_sring *)vif->rx_comms_area->addr;
+       rxs = page_address(vif->rx_ring_page);
        BACK_RING_INIT(&vif->rx, rxs, PAGE_SIZE);
 
+       vif->rx_req_cons_peek = 0;
+
        return 0;
 
 err:
-- 
1.7.2.5


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel

<Prev in Thread] Current Thread [Next in Thread>