Create helper functions for grant copy operations and use them in netback.
Signed-off-by: Zoltan Kiss <[email protected]>
---
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)
{
> -----Original Message-----
> From: Zoltan Kiss
> Sent: 02 April 2014 18:06
> To: Ian Campbell; Wei Liu; [email protected];
> [email protected]; [email protected]; David Vrabel
> Cc: Stefano Stabellini; Paul Durrant; [email protected]; linux-
> [email protected]; Jonathan Davies; Zoltan Kiss
> 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 <[email protected]>
> ---
> 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);
Can't you lose the flags here (and in the other variants)? Since they are implied by the variant of the function they could just be hardcoded there, couldn't they?
Paul
> } 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)
> {
On 03/04/14 09:12, Paul Durrant wrote:
> Zoltan Kiss wrote:
>>
>> Create helper functions for grant copy operations and use them in netback.
>>
[...]
>> --- 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);
>
> Can't you lose the flags here (and in the other variants)? Since
> they are implied by the variant of the function they could just be hardcoded
> there, couldn't they?
Even with that change these are still functions with 7 or 8 parameters
with no obvious order. That's just awful. The open-coded struct
initialization is better.
David
On Thu, 2014-04-03 at 10:48 +0100, David Vrabel wrote:
> On 03/04/14 09:12, Paul Durrant wrote:
> > Zoltan Kiss wrote:
> >>
> >> Create helper functions for grant copy operations and use them in netback.
> >>
> [...]
> >> --- 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);
> >
> > Can't you lose the flags here (and in the other variants)? Since
> > they are implied by the variant of the function they could just be hardcoded
> > there, couldn't they?
>
> Even with that change these are still functions with 7 or 8 parameters
> with no obvious order. That's just awful. The open-coded struct
> initialization is better.
Yes, I think this was a failed experiment.
The original code would likely still be improvable by using a temporary
variable to hold "vif->tx_copy_ops[*copy_ops]", basically the way the
mapping ops are via mop->.
Ian.