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Date: Wed, 2 Apr 2014 18:05:49 +0100
From: Zoltan Kiss <zoltan.kiss@...rix.com>
To: <ian.campbell@...rix.com>, <wei.liu2@...rix.com>,
<xen-devel@...ts.xenproject.org>, <konrad.wilk@...cle.com>,
<boris.ostrovsky@...cle.com>, <david.vrabel@...rix.com>
CC: <stefano.stabellini@...citrix.com>, <paul.durrant@...rix.com>,
<netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<jonathan.davies@...rix.com>, Zoltan Kiss <zoltan.kiss@...rix.com>
Subject: [PATCH] grant-table, xen-netback: Introduce helper functions for grant copy operations
Create helper functions for grant copy operations and use them in netback.
Signed-off-by: Zoltan Kiss <zoltan.kiss@...rix.com>
---
diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c
index 8d3bb4a..874df60 100644
--- a/drivers/net/xen-netback/netback.c
+++ b/drivers/net/xen-netback/netback.c
@@ -275,23 +275,29 @@ static void xenvif_gop_frag_copy(struct xenvif *vif, struct sk_buff *skb,
bytes = MAX_BUFFER_OFFSET - npo->copy_off;
copy_gop = npo->copy + npo->copy_prod++;
- copy_gop->flags = GNTCOPY_dest_gref;
- copy_gop->len = bytes;
if (foreign_vif) {
- copy_gop->source.domid = foreign_vif->domid;
- copy_gop->source.u.ref = foreign_gref;
- copy_gop->flags |= GNTCOPY_source_gref;
+ gnttab_set_copy_op_ref_to_ref(copy_gop,
+ foreign_gref,
+ npo->copy_gref,
+ foreign_vif->domid,
+ offset,
+ vif->domid,
+ npo->copy_off,
+ bytes,
+ GNTCOPY_dest_gref |
+ GNTCOPY_source_gref);
} else {
- copy_gop->source.domid = DOMID_SELF;
- copy_gop->source.u.gmfn =
- virt_to_mfn(page_address(page));
+ gnttab_set_copy_op_gmfn_to_ref(copy_gop,
+ virt_to_mfn(page_address(page)),
+ npo->copy_gref,
+ DOMID_SELF,
+ offset,
+ vif->domid,
+ npo->copy_off,
+ bytes,
+ GNTCOPY_dest_gref);
}
- copy_gop->source.offset = offset;
-
- copy_gop->dest.domid = vif->domid;
- copy_gop->dest.offset = npo->copy_off;
- copy_gop->dest.u.ref = npo->copy_gref;
npo->copy_off += bytes;
meta->size += bytes;
@@ -1297,18 +1303,16 @@ static void xenvif_tx_build_gops(struct xenvif *vif,
XENVIF_TX_CB(skb)->pending_idx = pending_idx;
__skb_put(skb, data_len);
- vif->tx_copy_ops[*copy_ops].source.u.ref = txreq.gref;
- vif->tx_copy_ops[*copy_ops].source.domid = vif->domid;
- vif->tx_copy_ops[*copy_ops].source.offset = txreq.offset;
-
- vif->tx_copy_ops[*copy_ops].dest.u.gmfn =
- virt_to_mfn(skb->data);
- vif->tx_copy_ops[*copy_ops].dest.domid = DOMID_SELF;
- vif->tx_copy_ops[*copy_ops].dest.offset =
- offset_in_page(skb->data);
-
- vif->tx_copy_ops[*copy_ops].len = data_len;
- vif->tx_copy_ops[*copy_ops].flags = GNTCOPY_source_gref;
+
+ gnttab_set_copy_op_ref_to_gmfn(&vif->tx_copy_ops[*copy_ops],
+ txreq.gref,
+ virt_to_mfn(skb->data),
+ vif->domid,
+ txreq.offset,
+ DOMID_SELF,
+ offset_in_page(skb->data),
+ data_len,
+ GNTCOPY_source_gref);
(*copy_ops)++;
diff --git a/include/xen/grant_table.h b/include/xen/grant_table.h
index a5af2a2..90a2f4c 100644
--- a/include/xen/grant_table.h
+++ b/include/xen/grant_table.h
@@ -140,6 +140,59 @@ void gnttab_grant_foreign_transfer_ref(grant_ref_t, domid_t domid,
unsigned long pfn);
static inline void
+gnttab_set_copy_op_common(struct gnttab_copy *copy,
+ domid_t src_domid, uint16_t src_offset,
+ domid_t dst_domid, uint16_t dst_offset,
+ uint16_t len, uint16_t flags)
+{
+ copy->source.domid = src_domid;
+ copy->source.offset = src_offset;
+ copy->dest.domid = dst_domid;
+ copy->dest.offset = dst_offset;
+ copy->len = len;
+ copy->flags = flags;
+}
+
+static inline void
+gnttab_set_copy_op_gmfn_to_ref(struct gnttab_copy *copy,
+ xen_pfn_t src_gmfn, grant_ref_t dst_ref,
+ domid_t src_domid, uint16_t src_offset,
+ domid_t dst_domid, uint16_t dst_offset,
+ uint16_t len, uint16_t flags)
+{
+ copy->source.u.gmfn = src_gmfn;
+ copy->dest.u.ref = dst_ref;
+ gnttab_set_copy_op_common(copy, src_domid, src_offset, dst_domid,
+ dst_offset, len, flags);
+}
+
+static inline void
+gnttab_set_copy_op_ref_to_ref(struct gnttab_copy *copy,
+ grant_ref_t src_ref, grant_ref_t dst_ref,
+ domid_t src_domid, uint16_t src_offset,
+ domid_t dst_domid, uint16_t dst_offset,
+ uint16_t len, uint16_t flags)
+{
+ copy->source.u.ref = src_ref;
+ copy->dest.u.ref = dst_ref;
+ gnttab_set_copy_op_common(copy, src_domid, src_offset, dst_domid,
+ dst_offset, len, flags);
+}
+
+static inline void
+gnttab_set_copy_op_ref_to_gmfn(struct gnttab_copy *copy,
+ grant_ref_t src_ref, xen_pfn_t dst_gmfn,
+ domid_t src_domid, uint16_t src_offset,
+ domid_t dst_domid, uint16_t dst_offset,
+ uint16_t len, uint16_t flags)
+{
+ copy->source.u.ref = src_ref;
+ copy->dest.u.gmfn = dst_gmfn;
+ gnttab_set_copy_op_common(copy, src_domid, src_offset, dst_domid,
+ dst_offset, len, flags);
+}
+
+static inline void
gnttab_set_map_op(struct gnttab_map_grant_ref *map, phys_addr_t addr,
uint32_t flags, grant_ref_t ref, domid_t domid)
{
--
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