[PATCH net-next v22 01/14] virtio_pci: Remove supported_caps cache and build assert

[Shahar Shitrit <shshitrit@nvidia.com>]

From: Daniel Jurgens <danielj@nvidia.com>

Following patches introduce capability IDs above 63 (e.g. 0x800),
making the capability ID list larger than a single u64. Remove the
cached supported_caps field so the code uses data->supported_caps
directly, transparently handling a bitmap of any size. Remove the
build assert that enforced the list fit in 64 bits.

Signed-off-by: Daniel Jurgens <danielj@nvidia.com>
Reviewed-by: Parav Pandit <parav@nvidia.com>
Reviewed-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Signed-off-by: Shahar Shitrit <shshitrit@nvidia.com>
---
 drivers/virtio/virtio_pci_common.h |  1 -
 drivers/virtio/virtio_pci_modern.c | 10 +++-------
 2 files changed, 3 insertions(+), 8 deletions(-)

diff --git a/drivers/virtio/virtio_pci_common.h b/drivers/virtio/virtio_pci_common.h
index 8cd01de27baf..fc26e035e7a6 100644
--- a/drivers/virtio/virtio_pci_common.h
+++ b/drivers/virtio/virtio_pci_common.h
@@ -48,7 +48,6 @@ struct virtio_pci_admin_vq {
 	/* Protects virtqueue access. */
 	spinlock_t lock;
 	u64 supported_cmds;
-	u64 supported_caps;
 	u8 max_dev_parts_objects;
 	struct ida dev_parts_ida;
 	/* Name of the admin queue: avq.$vq_index. */
diff --git a/drivers/virtio/virtio_pci_modern.c b/drivers/virtio/virtio_pci_modern.c
index 6d8ae2a6a8ca..ef4a64eb9982 100644
--- a/drivers/virtio/virtio_pci_modern.c
+++ b/drivers/virtio/virtio_pci_modern.c
@@ -304,10 +304,10 @@ virtio_pci_admin_cmd_dev_parts_objects_enable(struct virtio_device *virtio_dev)
 
 static void virtio_pci_admin_cmd_cap_init(struct virtio_device *virtio_dev)
 {
-	struct virtio_pci_device *vp_dev = to_vp_device(virtio_dev);
 	struct virtio_admin_cmd_query_cap_id_result *data;
 	struct virtio_admin_cmd cmd = {};
 	struct scatterlist result_sg;
+	u64 caps;
 	int ret;
 
 	data = kzalloc_obj(*data);
@@ -323,12 +323,8 @@ static void virtio_pci_admin_cmd_cap_init(struct virtio_device *virtio_dev)
 	if (ret)
 		goto end;
 
-	/* Max number of caps fits into a single u64 */
-	BUILD_BUG_ON(sizeof(data->supported_caps) > sizeof(u64));
-
-	vp_dev->admin_vq.supported_caps = le64_to_cpu(data->supported_caps[0]);
-
-	if (!(vp_dev->admin_vq.supported_caps & (1 << VIRTIO_DEV_PARTS_CAP)))
+	caps = le64_to_cpu(data->supported_caps[0]);
+	if (!(caps & BIT_ULL(VIRTIO_DEV_PARTS_CAP)))
 		goto end;
 
 	virtio_pci_admin_cmd_dev_parts_objects_enable(virtio_dev);
-- 
2.49.0