linux-kernel - [PATCH v3 2/4] vdpa_sim_blk: make vdpasim_blk_check

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Date:   Thu, 11 Aug 2022 10:36:30 +0200
From:   Stefano Garzarella <sgarzare@...hat.com>
To:     virtualization@...ts.linux-foundation.org
Cc:     linux-kernel@...r.kernel.org,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Stefano Garzarella <sgarzare@...hat.com>
Subject: [PATCH v3 2/4] vdpa_sim_blk: make vdpasim_blk_check_range usable by other requests

Next patches will add handling of other requests, where will be
useful to reuse vdpasim_blk_check_range().
So let's make it more generic by adding the `max_sectors` parameter,
since different requests allow different numbers of maximum sectors.

Let's also print the messages directly in vdpasim_blk_check_range()
to avoid duplicate prints.

Signed-off-by: Stefano Garzarella <sgarzare@...hat.com>
---
 drivers/vdpa/vdpa_sim/vdpa_sim_blk.c | 38 +++++++++++++++++-----------
 1 file changed, 23 insertions(+), 15 deletions(-)

diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c b/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c
index 69c9f4f36f9a..24dd9cae6450 100644
--- a/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c
+++ b/drivers/vdpa/vdpa_sim/vdpa_sim_blk.c
@@ -42,18 +42,28 @@
 
 static char vdpasim_blk_id[VIRTIO_BLK_ID_BYTES] = "vdpa_blk_sim";
 
-static bool vdpasim_blk_check_range(u64 start_sector, size_t range_size)
+static bool vdpasim_blk_check_range(struct vdpasim *vdpasim, u64 start_sector,
+				    u64 num_sectors, u64 max_sectors)
 {
-	u64 range_sectors = range_size >> SECTOR_SHIFT;
-
-	if (range_size > VDPASIM_BLK_SIZE_MAX * VDPASIM_BLK_SEG_MAX)
-		return false;
+	if (start_sector > VDPASIM_BLK_CAPACITY) {
+		dev_dbg(&vdpasim->vdpa.dev,
+			"starting sector exceeds the capacity - start: 0x%llx capacity: 0x%x\n",
+			start_sector, VDPASIM_BLK_CAPACITY);
+	}
 
-	if (start_sector > VDPASIM_BLK_CAPACITY)
+	if (num_sectors > max_sectors) {
+		dev_dbg(&vdpasim->vdpa.dev,
+			"number of sectors exceeds the max allowed in a request - num: 0x%llx max: 0x%llx\n",
+			num_sectors, max_sectors);
 		return false;
+	}
 
-	if (range_sectors > VDPASIM_BLK_CAPACITY - start_sector)
+	if (num_sectors > VDPASIM_BLK_CAPACITY - start_sector) {
+		dev_dbg(&vdpasim->vdpa.dev,
+			"request exceeds the capacity - start: 0x%llx num: 0x%llx capacity: 0x%x\n",
+			start_sector, num_sectors, VDPASIM_BLK_CAPACITY);
 		return false;
+	}
 
 	return true;
 }
@@ -123,10 +133,9 @@ static bool vdpasim_blk_handle_req(struct vdpasim *vdpasim,
 
 	switch (type) {
 	case VIRTIO_BLK_T_IN:
-		if (!vdpasim_blk_check_range(sector, to_push)) {
-			dev_dbg(&vdpasim->vdpa.dev,
-				"reading over the capacity - offset: 0x%llx len: 0x%zx\n",
-				offset, to_push);
+		if (!vdpasim_blk_check_range(vdpasim, sector,
+					     to_push >> SECTOR_SHIFT,
+					     VDPASIM_BLK_SIZE_MAX * VDPASIM_BLK_SEG_MAX)) {
 			status = VIRTIO_BLK_S_IOERR;
 			break;
 		}
@@ -146,10 +155,9 @@ static bool vdpasim_blk_handle_req(struct vdpasim *vdpasim,
 		break;
 
 	case VIRTIO_BLK_T_OUT:
-		if (!vdpasim_blk_check_range(sector, to_pull)) {
-			dev_dbg(&vdpasim->vdpa.dev,
-				"writing over the capacity - offset: 0x%llx len: 0x%zx\n",
-				offset, to_pull);
+		if (!vdpasim_blk_check_range(vdpasim, sector,
+					     to_pull >> SECTOR_SHIFT,
+					     VDPASIM_BLK_SIZE_MAX * VDPASIM_BLK_SEG_MAX)) {
 			status = VIRTIO_BLK_S_IOERR;
 			break;
 		}
-- 
2.37.1