Changeset b8ef198b in mainline for uspace/lib/virtio/virtio.c

Timestamp:

2018-06-20T18:58:44Z (7 years ago)

Author:

Jakub Jermar <jakub@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

9afd2a8

Parents:

3d135e9

Message:

Implement virtio-net interrupt handler

File:

• uspace/lib/virtio/virtio.c (modified) (2 diffs)

uspace/lib/virtio/virtio.c

@@ -71 +71 @@
 }
 
+bool virtio_virtq_consume_used(virtio_dev_t *vdev, uint16_t num,
+    uint16_t *descno, uint32_t *len)
+{
+        virtq_t *q = &vdev->queues[num];
+
+        uint16_t last_idx = q->used_last_idx % q->queue_size;
+        if (last_idx == (pio_read_le16(&q->used->idx) % q->queue_size))
+                return false;
+
+        *descno = (uint16_t) pio_read_le32(&q->used->ring[last_idx].id);
+        *len = pio_read_le32(&q->used->ring[last_idx].len);
+
+        q->used_last_idx++;
+
+        return true;
+}
+
 errno_t virtio_virtq_setup(virtio_dev_t *vdev, uint16_t num, uint16_t size)
 {
@@ -120 +137 @@
         q->avail = q->virt + avail_offset;
         q->used = q->virt + used_offset;
+        q->used_last_idx = 0;
 
         memset(q->virt, 0, q->size);