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hyperv: Add support for physically discontinuous receive buffer

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This will allow us to use bigger receive buffer, and prevent allocation failure
due to fragmented memory.

Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Reviewed-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Haiyang Zhang
2014-01-27 15:03:42 -08:00
zatwierdzone przez David S. Miller
rodzic 731073b9c9
commit b679ef73ed
3 zmienionych plików z 11 dodań i 12 usunięć
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14
drivers/hv/channel.c
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@@ -209,7 +209,6 @@ static int create_gpadl_header(void *kbuffer, u32 size,
{
int i;
int pagecount;
unsigned long long pfn;
struct vmbus_channel_gpadl_header *gpadl_header;
struct vmbus_channel_gpadl_body *gpadl_body;
struct vmbus_channel_msginfo *msgheader;
@@ -219,7 +218,6 @@ static int create_gpadl_header(void *kbuffer, u32 size,
int pfnsum, pfncount, pfnleft, pfncurr, pfnsize;
pagecount = size >> PAGE_SHIFT;
pfn = virt_to_phys(kbuffer) >> PAGE_SHIFT;
/* do we need a gpadl body msg */
pfnsize = MAX_SIZE_CHANNEL_MESSAGE -
@@ -248,7 +246,8 @@ static int create_gpadl_header(void *kbuffer, u32 size,
gpadl_header->range[0].byte_offset = 0;
gpadl_header->range[0].byte_count = size;
for (i = 0; i < pfncount; i++)
gpadl_header->range[0].pfn_array[i] = pfn+i;
gpadl_header->range[0].pfn_array[i] = slow_virt_to_phys(
kbuffer + PAGE_SIZE * i) >> PAGE_SHIFT;
*msginfo = msgheader;
*messagecount = 1;
@@ -301,7 +300,9 @@ static int create_gpadl_header(void *kbuffer, u32 size,
* so the hypervisor gurantees that this is ok.
*/
for (i = 0; i < pfncurr; i++)
gpadl_body->pfn[i] = pfn + pfnsum + i;
gpadl_body->pfn[i] = slow_virt_to_phys(
kbuffer + PAGE_SIZE * (pfnsum + i)) >>
PAGE_SHIFT;
/* add to msg header */
list_add_tail(&msgbody->msglistentry,
@@ -327,7 +328,8 @@ static int create_gpadl_header(void *kbuffer, u32 size,
gpadl_header->range[0].byte_offset = 0;
gpadl_header->range[0].byte_count = size;
for (i = 0; i < pagecount; i++)
gpadl_header->range[0].pfn_array[i] = pfn+i;
gpadl_header->range[0].pfn_array[i] = slow_virt_to_phys(
kbuffer + PAGE_SIZE * i) >> PAGE_SHIFT;
*msginfo = msgheader;
*messagecount = 1;
@@ -344,7 +346,7 @@ nomem:
* vmbus_establish_gpadl - Estabish a GPADL for the specified buffer
*
* @channel: a channel
* @kbuffer: from kmalloc
* @kbuffer: from kmalloc or vmalloc
* @size: page-size multiple
* @gpadl_handle: some funky thing
*/