linux-kernel - [PATCH v2] scsi: storvsc: Correct reporting of Hyper-V I/O size limits

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Message-Id: <1655142096-3591-1-git-send-email-ssengar@linux.microsoft.com>
Date:   Mon, 13 Jun 2022 10:41:36 -0700
From:   Saurabh Sengar <ssengar@...ux.microsoft.com>
To:     kys@...rosoft.com, haiyangz@...rosoft.com, sthemmin@...rosoft.com,
        wei.liu@...nel.org, decui@...rosoft.com, jejb@...ux.ibm.com,
        martin.petersen@...cle.com, linux-hyperv@...r.kernel.org,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        ssengar@...rosoft.com, mikelley@...rosoft.com
Subject: [PATCH v2] scsi: storvsc: Correct reporting of Hyper-V I/O size limits

Current code is based on the idea that the max number of SGL entries
also determines the max size of an I/O request.  While this idea was
true in older versions of the storvsc driver when SGL entry length
was limited to 4 Kbytes, commit 3d9c3dcc58e9 ("scsi: storvsc: Enable
scatterlist entry lengths > 4Kbytes") removed that limitation. It's
now theoretically possible for the block layer to send requests that
exceed the maximum size supported by Hyper-V. This problem doesn't
currently happen in practice because the block layer defaults to a
512 Kbyte maximum, while Hyper-V in Azure supports 2 Mbyte I/O sizes.
But some future configuration of Hyper-V could have a smaller max I/O
size, and the block layer could exceed that max.

Fix this by correctly setting max_sectors as well as sg_tablesize to
reflect the maximum I/O size that Hyper-V reports. While allowing
I/O sizes larger than the block layer default of 512 Kbytes doesn’t
provide any noticeable performance benefit in the tests we ran, it's
still appropriate to report the correct underlying Hyper-V capabilities
to the Linux block layer.

Also tweak the virt_boundary_mask to reflect that the required
alignment derives from Hyper-V communication using a 4 Kbyte page size,
and not on the guest page size, which might be bigger (eg. ARM64).

Fixes: '3d9c3dcc58e9 ("scsi: storvsc: Enable scatter list entry lengths > 4Kbytes")'
Signed-off-by: Saurabh Sengar <ssengar@...ux.microsoft.com>
---
V2
 - More descriptive commit subject and message
 - Better logic by considering max_transfer_bytes aligning to HV_HYP_PAGE_SIZE

 drivers/scsi/storvsc_drv.c | 26 +++++++++++++++++++++-----
 1 file changed, 21 insertions(+), 5 deletions(-)

diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index ca3530982e52..99d3be1b6089 100644
--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -1844,7 +1844,7 @@ static struct scsi_host_template scsi_driver = {
 	.cmd_per_lun =		2048,
 	.this_id =		-1,
 	/* Ensure there are no gaps in presented sgls */
-	.virt_boundary_mask =	PAGE_SIZE-1,
+	.virt_boundary_mask =	HV_HYP_PAGE_SIZE - 1,
 	.no_write_same =	1,
 	.track_queue_depth =	1,
 	.change_queue_depth =	storvsc_change_queue_depth,
@@ -1895,6 +1895,7 @@ static int storvsc_probe(struct hv_device *device,
 	int target = 0;
 	struct storvsc_device *stor_device;
 	int max_sub_channels = 0;
+	u32 max_tx_bytes;
 
 	/*
 	 * We support sub-channels for storage on SCSI and FC controllers.
@@ -1968,12 +1969,27 @@ static int storvsc_probe(struct hv_device *device,
 	}
 	/* max cmd length */
 	host->max_cmd_len = STORVSC_MAX_CMD_LEN;
-
+	/* Any reasonable Hyper-V configuration should provide
+	 * max_transfer_bytes value aligning to HV_HYP_PAGE_SIZE,
+	 * protecting it from any weird value.
+	 */
+	max_tx_bytes = round_down(stor_device->max_transfer_bytes, HV_HYP_PAGE_SIZE);
+	/* max_hw_sectors_kb */
+	host->max_sectors = max_tx_bytes >> 9;
 	/*
-	 * set the table size based on the info we got
-	 * from the host.
+	 * There are 2 requirements for Hyper-V storvsc sgl segments,
+	 * based on which the below calculation for max segments is
+	 * done:
+	 *
+	 * 1. Except for the first and last sgl segment, all sgl segments
+	 *    should be align to HV_HYP_PAGE_SIZE, that also means the
+	 *    maximum number of segments in a sgl can be calculated by
+	 *    dividing the total max transfer length by HV_HYP_PAGE_SIZE.
+	 *
+	 * 2. Except for the first and last, each entry in the SGL must
+	 *    have an offset that is a multiple of HV_HYP_PAGE_SIZE.
 	 */
-	host->sg_tablesize = (stor_device->max_transfer_bytes >> PAGE_SHIFT);
+	host->sg_tablesize = (max_tx_bytes >> HV_HYP_PAGE_SHIFT) + 1;
 	/*
 	 * For non-IDE disks, the host supports multiple channels.
 	 * Set the number of HW queues we are supporting.
-- 
2.25.1