scsi: storvsc: Don't pass unused PFNs to Hyper-V host

[ Upstream commit 4e81a6cba517cb33584308a331f14f5e3fec369b ]

In a SCSI request, storvsc pre-allocates space for up to
MAX_PAGE_BUFFER_COUNT physical frame numbers to be passed to Hyper-V.  If
the size of the I/O request requires more PFNs, a separate memory area of
exactly the correct size is dynamically allocated.

But when the pre-allocated area is used, current code always passes
MAX_PAGE_BUFFER_COUNT PFNs to Hyper-V, even if fewer are needed.  While
this doesn't break anything because the additional PFNs are always zero,
more bytes than necessary are copied into the VMBus channel ring buffer.
This takes CPU cycles and wastes space in the ring buffer. For a typical 4
Kbyte I/O that requires only a single PFN, 248 unnecessary bytes are
copied.

Fix this by setting the payload_sz based on the actual number of PFNs
required, not the size of the pre-allocated space.

Reported-by: John Starks <jostarks@microsoft.com>
Fixes: 8f43710543ef ("scsi: storvsc: Support PAGE_SIZE larger than 4K")
Signed-off-by: Michael Kelley <mikelley@microsoft.com>
Link: https://lore.kernel.org/r/1684171241-16209-1-git-send-email-mikelley@microsoft.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index a0665bca54b99c3d6ef85146c58b0125112380db..5284f9a0b826e40a2e14ced59b97950ebcb35d74 100644 (file)
--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -1780,7 +1780,7 @@ static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd)
 
        length = scsi_bufflen(scmnd);
        payload = (struct vmbus_packet_mpb_array *)&cmd_request->mpb;
-       payload_sz = sizeof(cmd_request->mpb);
+       payload_sz = 0;
 
        if (scsi_sg_count(scmnd)) {
                unsigned long offset_in_hvpg = offset_in_hvpage(sgl->offset);
@@ -1789,10 +1789,10 @@ static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd)
                unsigned long hvpfn, hvpfns_to_add;
                int j, i = 0, sg_count;
 
-               if (hvpg_count > MAX_PAGE_BUFFER_COUNT) {
+               payload_sz = (hvpg_count * sizeof(u64) +
+                             sizeof(struct vmbus_packet_mpb_array));
 
-                       payload_sz = (hvpg_count * sizeof(u64) +
-                                     sizeof(struct vmbus_packet_mpb_array));
+               if (hvpg_count > MAX_PAGE_BUFFER_COUNT) {
                        payload = kzalloc(payload_sz, GFP_ATOMIC);
                        if (!payload)
                                return SCSI_MLQUEUE_DEVICE_BUSY;