[SRU][Q/P/O/N:linux-azure][PATCH 5/5] Drivers: hv: vmbus: Remove vmbus_sendpacket_pagebuffer()

[John Cabaj]

From: Michael Kelley <mhklinux at outlook.com>

BugLink: https://bugs.launchpad.net/bugs/2112423

With the netvsc driver changed to use vmbus_sendpacket_mpb_desc()
instead of vmbus_sendpacket_pagebuffer(), the latter has no remaining
callers. Remove it.

Cc: <stable at vger.kernel.org> # 6.1.x
Signed-off-by: Michael Kelley <mhklinux at outlook.com>
Link: https://patch.msgid.link/20250513000604.1396-6-mhklinux@outlook.com
Signed-off-by: Jakub Kicinski <kuba at kernel.org>
(cherry picked from commit 45a442fe369e6c4e0b4aa9f63b31c3f2f9e2090e)
Signed-off-by: John Cabaj <john.cabaj at canonical.com>
---
 drivers/hv/channel.c   | 59 ------------------------------------------
 include/linux/hyperv.h |  7 -----
 2 files changed, 66 deletions(-)

diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c
index 4ffd5eaa7817..35f26fa1ffe7 100644
--- a/drivers/hv/channel.c
+++ b/drivers/hv/channel.c
@@ -1076,65 +1076,6 @@ int vmbus_sendpacket(struct vmbus_channel *channel, void *buffer,
 }
 EXPORT_SYMBOL(vmbus_sendpacket);
 
-/*
- * vmbus_sendpacket_pagebuffer - Send a range of single-page buffer
- * packets using a GPADL Direct packet type. This interface allows you
- * to control notifying the host. This will be useful for sending
- * batched data. Also the sender can control the send flags
- * explicitly.
- */
-int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel,
-				struct hv_page_buffer pagebuffers[],
-				u32 pagecount, void *buffer, u32 bufferlen,
-				u64 requestid)
-{
-	int i;
-	struct vmbus_channel_packet_page_buffer desc;
-	u32 descsize;
-	u32 packetlen;
-	u32 packetlen_aligned;
-	struct kvec bufferlist[3];
-	u64 aligned_data = 0;
-
-	if (pagecount > MAX_PAGE_BUFFER_COUNT)
-		return -EINVAL;
-
-	/*
-	 * Adjust the size down since vmbus_channel_packet_page_buffer is the
-	 * largest size we support
-	 */
-	descsize = sizeof(struct vmbus_channel_packet_page_buffer) -
-			  ((MAX_PAGE_BUFFER_COUNT - pagecount) *
-			  sizeof(struct hv_page_buffer));
-	packetlen = descsize + bufferlen;
-	packetlen_aligned = ALIGN(packetlen, sizeof(u64));
-
-	/* Setup the descriptor */
-	desc.type = VM_PKT_DATA_USING_GPA_DIRECT;
-	desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED;
-	desc.dataoffset8 = descsize >> 3; /* in 8-bytes granularity */
-	desc.length8 = (u16)(packetlen_aligned >> 3);
-	desc.transactionid = VMBUS_RQST_ERROR; /* will be updated in hv_ringbuffer_write() */
-	desc.reserved = 0;
-	desc.rangecount = pagecount;
-
-	for (i = 0; i < pagecount; i++) {
-		desc.range[i].len = pagebuffers[i].len;
-		desc.range[i].offset = pagebuffers[i].offset;
-		desc.range[i].pfn	 = pagebuffers[i].pfn;
-	}
-
-	bufferlist[0].iov_base = &desc;
-	bufferlist[0].iov_len = descsize;
-	bufferlist[1].iov_base = buffer;
-	bufferlist[1].iov_len = bufferlen;
-	bufferlist[2].iov_base = &aligned_data;
-	bufferlist[2].iov_len = (packetlen_aligned - packetlen);
-
-	return hv_ringbuffer_write(channel, bufferlist, 3, requestid, NULL);
-}
-EXPORT_SYMBOL_GPL(vmbus_sendpacket_pagebuffer);
-
 /*
  * vmbus_sendpacket_mpb_desc - Send one or more multi-page buffer packets
  * using a GPADL Direct packet type.
diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index 8eddebac68b0..dc6340032bd9 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -1218,13 +1218,6 @@ extern int vmbus_sendpacket(struct vmbus_channel *channel,
 				  enum vmbus_packet_type type,
 				  u32 flags);
 
-extern int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel,
-					    struct hv_page_buffer pagebuffers[],
-					    u32 pagecount,
-					    void *buffer,
-					    u32 bufferlen,
-					    u64 requestid);
-
 extern int vmbus_sendpacket_mpb_desc(struct vmbus_channel *channel,
 				     struct vmbus_packet_mpb_array *mpb,
 				     u32 desc_size,
-- 
2.43.0