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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] Fix netfront receive path for auto_translate_physmap mode.
# HG changeset patch
# User kaf24@xxxxxxxxxxxxxxxxxxxx
# Node ID 3dde684846837f45f83bb254b755bf2632e8cbcf
# Parent 066ac36725f3993967425f4d5114605fab8e96c2
Fix netfront receive path for auto_translate_physmap mode.
Signed-off-by: Steven Smith <sos22@xxxxxxxxx>
Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>
diff -r 066ac36725f3 -r 3dde68484683
linux-2.6-xen-sparse/drivers/xen/core/gnttab.c
--- a/linux-2.6-xen-sparse/drivers/xen/core/gnttab.c Thu Feb 23 13:50:00 2006
+++ b/linux-2.6-xen-sparse/drivers/xen/core/gnttab.c Thu Feb 23 14:22:12 2006
@@ -222,25 +222,22 @@
}
int
-gnttab_grant_foreign_transfer(domid_t domid)
+gnttab_grant_foreign_transfer(domid_t domid, unsigned long pfn)
{
int ref;
if (unlikely((ref = get_free_entry()) == -1))
return -ENOSPC;
-
- shared[ref].frame = 0;
- shared[ref].domid = domid;
- wmb();
- shared[ref].flags = GTF_accept_transfer;
+ gnttab_grant_foreign_transfer_ref(ref, domid, pfn);
return ref;
}
void
-gnttab_grant_foreign_transfer_ref(grant_ref_t ref, domid_t domid)
-{
- shared[ref].frame = 0;
+gnttab_grant_foreign_transfer_ref(grant_ref_t ref, domid_t domid,
+ unsigned long pfn)
+{
+ shared[ref].frame = pfn;
shared[ref].domid = domid;
wmb();
shared[ref].flags = GTF_accept_transfer;
diff -r 066ac36725f3 -r 3dde68484683
linux-2.6-xen-sparse/drivers/xen/netfront/netfront.c
--- a/linux-2.6-xen-sparse/drivers/xen/netfront/netfront.c Thu Feb 23
13:50:00 2006
+++ b/linux-2.6-xen-sparse/drivers/xen/netfront/netfront.c Thu Feb 23
14:22:12 2006
@@ -587,25 +587,23 @@
BUG_ON((signed short)ref < 0);
np->grant_rx_ref[id] = ref;
gnttab_grant_foreign_transfer_ref(ref,
- np->xbdev->otherend_id);
+ np->xbdev->otherend_id,
+ __pa(skb->head) >>
PAGE_SHIFT);
RING_GET_REQUEST(&np->rx, req_prod + i)->gref = ref;
rx_pfn_array[i] = virt_to_mfn(skb->head);
- /* Remove this page from map before passing back to Xen. */
- set_phys_to_machine(__pa(skb->head) >> PAGE_SHIFT,
- INVALID_P2M_ENTRY);
-
- MULTI_update_va_mapping(rx_mcl+i, (unsigned long)skb->head,
- __pte(0), 0);
- }
-
- /* After all PTEs have been zapped we blow away stale TLB entries. */
- rx_mcl[i-1].args[MULTI_UVMFLAGS_INDEX] = UVMF_TLB_FLUSH|UVMF_ALL;
-
- /* Give away a batch of pages. */
- rx_mcl[i].op = __HYPERVISOR_memory_op;
- rx_mcl[i].args[0] = XENMEM_decrease_reservation;
- rx_mcl[i].args[1] = (unsigned long)&reservation;
+ if (!xen_feature(XENFEAT_auto_translated_physmap)) {
+ /* Remove this page before passing back to Xen. */
+ set_phys_to_machine(__pa(skb->head) >> PAGE_SHIFT,
+ INVALID_P2M_ENTRY);
+ MULTI_update_va_mapping(rx_mcl+i,
+ (unsigned long)skb->head,
+ __pte(0), 0);
+ }
+ }
+
+ /* Tell the ballon driver what is going on. */
+ balloon_update_driver_allowance(i);
reservation.extent_start = rx_pfn_array;
reservation.nr_extents = i;
@@ -613,15 +611,27 @@
reservation.address_bits = 0;
reservation.domid = DOMID_SELF;
- /* Tell the ballon driver what is going on. */
- balloon_update_driver_allowance(i);
-
- /* Zap PTEs and give away pages in one big multicall. */
- (void)HYPERVISOR_multicall(rx_mcl, i+1);
-
- /* Check return status of HYPERVISOR_memory_op(). */
- if (unlikely(rx_mcl[i].result != i))
- panic("Unable to reduce memory reservation\n");
+ if (!xen_feature(XENFEAT_auto_translated_physmap)) {
+ /* After all PTEs have been zapped, flush the TLB. */
+ rx_mcl[i-1].args[MULTI_UVMFLAGS_INDEX] =
+ UVMF_TLB_FLUSH|UVMF_ALL;
+
+ /* Give away a batch of pages. */
+ rx_mcl[i].op = __HYPERVISOR_memory_op;
+ rx_mcl[i].args[0] = XENMEM_decrease_reservation;
+ rx_mcl[i].args[1] = (unsigned long)&reservation;
+
+ /* Zap PTEs and give away pages in one big multicall. */
+ (void)HYPERVISOR_multicall(rx_mcl, i+1);
+
+ /* Check return status of HYPERVISOR_memory_op(). */
+ if (unlikely(rx_mcl[i].result != i))
+ panic("Unable to reduce memory reservation\n");
+ } else {
+ if (HYPERVISOR_memory_op(XENMEM_decrease_reservation,
+ &reservation) != i)
+ panic("Unable to reduce memory reservation\n");
+ }
/* Above is a suitable barrier to ensure backend will see requests. */
np->rx.req_prod_pvt = req_prod + i;
@@ -802,17 +812,19 @@
np->stats.rx_packets++;
np->stats.rx_bytes += rx->status;
- /* Remap the page. */
- MULTI_update_va_mapping(mcl, (unsigned long)skb->head,
- pfn_pte_ma(mfn, PAGE_KERNEL), 0);
- mcl++;
if (!xen_feature(XENFEAT_auto_translated_physmap)) {
+ /* Remap the page. */
+ MULTI_update_va_mapping(mcl, (unsigned long)skb->head,
+ pfn_pte_ma(mfn, PAGE_KERNEL),
+ 0);
+ mcl++;
mmu->ptr = ((maddr_t)mfn << PAGE_SHIFT)
| MMU_MACHPHYS_UPDATE;
mmu->val = __pa(skb->head) >> PAGE_SHIFT;
mmu++;
- set_phys_to_machine(__pa(skb->head) >> PAGE_SHIFT, mfn);
+ set_phys_to_machine(__pa(skb->head) >> PAGE_SHIFT,
+ mfn);
}
__skb_queue_tail(&rxq, skb);
@@ -1003,7 +1015,8 @@
if ((unsigned long)np->rx_skbs[i] < __PAGE_OFFSET)
continue;
gnttab_grant_foreign_transfer_ref(
- np->grant_rx_ref[i], np->xbdev->otherend_id);
+ np->grant_rx_ref[i], np->xbdev->otherend_id,
+ __pa(np->rx_skbs[i]->data) >> PAGE_SHIFT);
RING_GET_REQUEST(&np->rx, requeue_idx)->gref =
np->grant_rx_ref[i];
RING_GET_REQUEST(&np->rx, requeue_idx)->id = i;
diff -r 066ac36725f3 -r 3dde68484683 linux-2.6-xen-sparse/include/xen/gnttab.h
--- a/linux-2.6-xen-sparse/include/xen/gnttab.h Thu Feb 23 13:50:00 2006
+++ b/linux-2.6-xen-sparse/include/xen/gnttab.h Thu Feb 23 14:22:12 2006
@@ -71,7 +71,7 @@
void gnttab_end_foreign_access(grant_ref_t ref, int readonly,
unsigned long page);
-int gnttab_grant_foreign_transfer(domid_t domid);
+int gnttab_grant_foreign_transfer(domid_t domid, unsigned long pfn);
unsigned long gnttab_end_foreign_transfer_ref(grant_ref_t ref);
unsigned long gnttab_end_foreign_transfer(grant_ref_t ref);
@@ -98,7 +98,8 @@
void gnttab_grant_foreign_access_ref(grant_ref_t ref, domid_t domid,
unsigned long frame, int readonly);
-void gnttab_grant_foreign_transfer_ref(grant_ref_t, domid_t domid);
+void gnttab_grant_foreign_transfer_ref(grant_ref_t, domid_t domid,
+ unsigned long pfn);
#ifdef __ia64__
#define gnttab_map_vaddr(map) __va(map.dev_bus_addr)
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