This patch introduces a transport specific methods to set or get the
coalescing parameters and implement the pci methods.
Signed-off-by: Jason Wang <jasowang@xxxxxxxxxx>
---
drivers/virtio/virtio_pci_modern.c | 15 +++++++++++++++
include/linux/virtio_config.h | 8 ++++++++
include/uapi/linux/virtio_pci.h | 4 ++++
3 files changed, 27 insertions(+)
diff --git a/drivers/virtio/virtio_pci_modern.c b/drivers/virtio/virtio_pci_modern.c
index e88e099..ce801ae 100644
--- a/drivers/virtio/virtio_pci_modern.c
+++ b/drivers/virtio/virtio_pci_modern.c
@@ -266,6 +266,16 @@ static void vp_set_status(struct virtio_device *vdev, u8 status)
vp_iowrite8(status, &vp_dev->common->device_status);
}
+static void vp_set_coalesce(struct virtio_device *vdev, int n,
+ u32 coalesce_count, u32 coalesce_us)
+{
+ struct virtio_pci_device *vp_dev = to_vp_device(vdev);
+
+ iowrite16(n, &vp_dev->common->queue_select);
+ iowrite32(coalesce_count, &vp_dev->common->queue_coalesce_count);
+ iowrite32(coalesce_us, &vp_dev->common->queue_coalesce_us);
+}
+
static void vp_reset(struct virtio_device *vdev)
{
struct virtio_pci_device *vp_dev = to_vp_device(vdev);
@@ -481,6 +491,7 @@ static const struct virtio_config_ops virtio_pci_config_ops = {
.generation = vp_generation,
.get_status = vp_get_status,
.set_status = vp_set_status,
+ .set_coalesce = vp_set_coalesce,
.reset = vp_reset,
.find_vqs = vp_modern_find_vqs,
.del_vqs = vp_del_vqs,
@@ -588,6 +599,10 @@ static inline void check_offsets(void)
offsetof(struct virtio_pci_common_cfg, queue_used_lo));
BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_USEDHI !=
offsetof(struct virtio_pci_common_cfg, queue_used_hi));
+ BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_COALESCE_C !=
+ offsetof(struct virtio_pci_common_cfg, queue_coalesce_count));
+ BUILD_BUG_ON(VIRTIO_PCI_COMMON_Q_COALESCE_U !=
+ offsetof(struct virtio_pci_common_cfg, queue_coalesce_us));
}
/* the PCI probing function */
diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
index 1e306f7..d100c32 100644
--- a/include/linux/virtio_config.h
+++ b/include/linux/virtio_config.h
@@ -28,6 +28,12 @@
* @set_status: write the status byte
* vdev: the virtio_device
* status: the new status byte
+ * @set_coalesce: set coalescing parameters
+ * vdev: the virtio_device
+ * n: the queue index
+ * coalesce_count: maximum coalesced count before issuing interrupt
+ * coalesce_count: maximum micro seconds to wait if there's a
+ * pending buffer
* @reset: reset the device
* vdev: the virtio device
* After this, status and feature negotiation must be done again
@@ -66,6 +72,8 @@ struct virtio_config_ops {
u32 (*generation)(struct virtio_device *vdev);
u8 (*get_status)(struct virtio_device *vdev);
void (*set_status)(struct virtio_device *vdev, u8 status);
+ void (*set_coalesce)(struct virtio_device *vdev, int n,
+ u32 coalesce_count, u32 coalesce_us);
void (*reset)(struct virtio_device *vdev);
int (*find_vqs)(struct virtio_device *, unsigned nvqs,
struct virtqueue *vqs[],
diff --git a/include/uapi/linux/virtio_pci.h b/include/uapi/linux/virtio_pci.h
index 7530146..3396026 100644
--- a/include/uapi/linux/virtio_pci.h
+++ b/include/uapi/linux/virtio_pci.h
@@ -155,6 +155,8 @@ struct virtio_pci_common_cfg {
__le32 queue_avail_hi; /* read-write */
__le32 queue_used_lo; /* read-write */
__le32 queue_used_hi; /* read-write */
+ __le32 queue_coalesce_count; /* read-write */
+ __le32 queue_coalesce_us; /* read-write */
};
/* Macro versions of offsets for the Old Timers! */
@@ -187,6 +189,8 @@ struct virtio_pci_common_cfg {
#define VIRTIO_PCI_COMMON_Q_AVAILHI 44
#define VIRTIO_PCI_COMMON_Q_USEDLO 48
#define VIRTIO_PCI_COMMON_Q_USEDHI 52
+#define VIRTIO_PCI_COMMON_Q_COALESCE_C 56
+#define VIRTIO_PCI_COMMON_Q_COALESCE_U 60
#endif /* VIRTIO_PCI_NO_MODERN */
--
1.8.3.1
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