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Subject[PATCH v4 07/11] hv_netvsc: Use HV_HYP_PAGE_SIZE for Hyper-V communication
Date
When communicating with Hyper-V, HV_HYP_PAGE_SIZE should be used since
that's the page size used by Hyper-V and Hyper-V expects all
page-related data using the unit of HY_HYP_PAGE_SIZE, for example, the
"pfn" in hv_page_buffer is actually the HV_HYP_PAGE (i.e. the Hyper-V
page) number.

In order to support guest whose page size is not 4k, we need to make
hv_netvsc always use HV_HYP_PAGE_SIZE for Hyper-V communication.

Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
---
drivers/net/hyperv/netvsc.c | 2 +-
drivers/net/hyperv/netvsc_drv.c | 46 +++++++++++++++----------------
drivers/net/hyperv/rndis_filter.c | 13 ++++-----
3 files changed, 30 insertions(+), 31 deletions(-)

diff --git a/drivers/net/hyperv/netvsc.c b/drivers/net/hyperv/netvsc.c
index 41f5cf0bb997..1d6f2256da6b 100644
--- a/drivers/net/hyperv/netvsc.c
+++ b/drivers/net/hyperv/netvsc.c
@@ -794,7 +794,7 @@ static void netvsc_copy_to_send_buf(struct netvsc_device *net_device,
}

for (i = 0; i < page_count; i++) {
- char *src = phys_to_virt(pb[i].pfn << PAGE_SHIFT);
+ char *src = phys_to_virt(pb[i].pfn << HV_HYP_PAGE_SHIFT);
u32 offset = pb[i].offset;
u32 len = pb[i].len;

diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
index 64b0a74c1523..61ea568e1ddf 100644
--- a/drivers/net/hyperv/netvsc_drv.c
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -373,32 +373,29 @@ static u16 netvsc_select_queue(struct net_device *ndev, struct sk_buff *skb,
return txq;
}

-static u32 fill_pg_buf(struct page *page, u32 offset, u32 len,
+static u32 fill_pg_buf(unsigned long hvpfn, u32 offset, u32 len,
struct hv_page_buffer *pb)
{
int j = 0;

- /* Deal with compound pages by ignoring unused part
- * of the page.
- */
- page += (offset >> PAGE_SHIFT);
- offset &= ~PAGE_MASK;
+ hvpfn += offset >> HV_HYP_PAGE_SHIFT;
+ offset = offset & ~HV_HYP_PAGE_MASK;

while (len > 0) {
unsigned long bytes;

- bytes = PAGE_SIZE - offset;
+ bytes = HV_HYP_PAGE_SIZE - offset;
if (bytes > len)
bytes = len;
- pb[j].pfn = page_to_pfn(page);
+ pb[j].pfn = hvpfn;
pb[j].offset = offset;
pb[j].len = bytes;

offset += bytes;
len -= bytes;

- if (offset == PAGE_SIZE && len) {
- page++;
+ if (offset == HV_HYP_PAGE_SIZE && len) {
+ hvpfn++;
offset = 0;
j++;
}
@@ -421,23 +418,26 @@ static u32 init_page_array(void *hdr, u32 len, struct sk_buff *skb,
* 2. skb linear data
* 3. skb fragment data
*/
- slots_used += fill_pg_buf(virt_to_page(hdr),
- offset_in_page(hdr),
- len, &pb[slots_used]);
+ slots_used += fill_pg_buf(virt_to_hvpfn(hdr),
+ offset_in_hvpage(hdr),
+ len,
+ &pb[slots_used]);

packet->rmsg_size = len;
packet->rmsg_pgcnt = slots_used;

- slots_used += fill_pg_buf(virt_to_page(data),
- offset_in_page(data),
- skb_headlen(skb), &pb[slots_used]);
+ slots_used += fill_pg_buf(virt_to_hvpfn(data),
+ offset_in_hvpage(data),
+ skb_headlen(skb),
+ &pb[slots_used]);

for (i = 0; i < frags; i++) {
skb_frag_t *frag = skb_shinfo(skb)->frags + i;

- slots_used += fill_pg_buf(skb_frag_page(frag),
- skb_frag_off(frag),
- skb_frag_size(frag), &pb[slots_used]);
+ slots_used += fill_pg_buf(page_to_hvpfn(skb_frag_page(frag)),
+ skb_frag_off(frag),
+ skb_frag_size(frag),
+ &pb[slots_used]);
}
return slots_used;
}
@@ -453,8 +453,8 @@ static int count_skb_frag_slots(struct sk_buff *skb)
unsigned long offset = skb_frag_off(frag);

/* Skip unused frames from start of page */
- offset &= ~PAGE_MASK;
- pages += PFN_UP(offset + size);
+ offset &= ~HV_HYP_PAGE_MASK;
+ pages += HVPFN_UP(offset + size);
}
return pages;
}
@@ -462,12 +462,12 @@ static int count_skb_frag_slots(struct sk_buff *skb)
static int netvsc_get_slots(struct sk_buff *skb)
{
char *data = skb->data;
- unsigned int offset = offset_in_page(data);
+ unsigned int offset = offset_in_hvpage(data);
unsigned int len = skb_headlen(skb);
int slots;
int frag_slots;

- slots = DIV_ROUND_UP(offset + len, PAGE_SIZE);
+ slots = DIV_ROUND_UP(offset + len, HV_HYP_PAGE_SIZE);
frag_slots = count_skb_frag_slots(skb);
return slots + frag_slots;
}
diff --git a/drivers/net/hyperv/rndis_filter.c b/drivers/net/hyperv/rndis_filter.c
index b81ceba38218..1e2de8fb7fec 100644
--- a/drivers/net/hyperv/rndis_filter.c
+++ b/drivers/net/hyperv/rndis_filter.c
@@ -25,7 +25,7 @@

static void rndis_set_multicast(struct work_struct *w);

-#define RNDIS_EXT_LEN PAGE_SIZE
+#define RNDIS_EXT_LEN HV_HYP_PAGE_SIZE
struct rndis_request {
struct list_head list_ent;
struct completion wait_event;
@@ -215,18 +215,17 @@ static int rndis_filter_send_request(struct rndis_device *dev,
packet->page_buf_cnt = 1;

pb[0].pfn = virt_to_phys(&req->request_msg) >>
- PAGE_SHIFT;
+ HV_HYP_PAGE_SHIFT;
pb[0].len = req->request_msg.msg_len;
- pb[0].offset =
- (unsigned long)&req->request_msg & (PAGE_SIZE - 1);
+ pb[0].offset = offset_in_hvpage(&req->request_msg);

/* Add one page_buf when request_msg crossing page boundary */
- if (pb[0].offset + pb[0].len > PAGE_SIZE) {
+ if (pb[0].offset + pb[0].len > HV_HYP_PAGE_SIZE) {
packet->page_buf_cnt++;
- pb[0].len = PAGE_SIZE -
+ pb[0].len = HV_HYP_PAGE_SIZE -
pb[0].offset;
pb[1].pfn = virt_to_phys((void *)&req->request_msg
- + pb[0].len) >> PAGE_SHIFT;
+ + pb[0].len) >> HV_HYP_PAGE_SHIFT;
pb[1].offset = 0;
pb[1].len = req->request_msg.msg_len -
pb[0].len;
--
2.28.0
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