[Minios-devel] [UNIKRAFT PATCH v4 4/8] plat/drivers: Configuring the transmit queue

[Sharan Santhanam <sharan.santhanam@xxxxxxxxx>]

The patch introduces the virtio net device implementation for
configuring the transmit queue

Signed-off-by: Sharan Santhanam <sharan.santhanam@xxxxxxxxx>
Signed-off-by: Razvan Cojocaru <razvan.cojocaru93@xxxxxxxxx>
Reviewed-by: Simon Kuenzer <simon.kuenzer@xxxxxxxxx>
---
 plat/drivers/virtio/virtio_net.c | 42 +++++++++++++++++++++++++++++++++++++++-
 1 file changed, 41 insertions(+), 1 deletion(-)

diff --git a/plat/drivers/virtio/virtio_net.c b/plat/drivers/virtio/virtio_net.c
index 99698f3..3a749aa 100644
--- a/plat/drivers/virtio/virtio_net.c
+++ b/plat/drivers/virtio/virtio_net.c
@@ -363,9 +363,32 @@ static struct uk_netdev_tx_queue 
*virtio_netdev_tx_queue_setup(
                                struct uk_netdev_txqueue_conf *conf __unused)
 {
        struct uk_netdev_tx_queue *txq = NULL;
+       struct virtio_net_device *vndev;
+       int rc = 0;
 
        UK_ASSERT(n);
+       vndev = to_virtionetdev(n);
+       if (queue_id >= vndev->max_vqueue_pairs) {
+               uk_pr_err("Invalid virtqueue identifier: %"__PRIu16"\n",
+                         queue_id);
+               rc = -EINVAL;
+               goto err_exit;
+       }
+       /* Setup the virtqueue */
+       rc = virtio_netdev_vqueue_setup(vndev, queue_id, nb_desc, VNET_TX,
+                                       conf->a);
+       if (rc < 0) {
+               uk_pr_err("Failed to set up virtqueue %"__PRIu16": %d\n",
+                         queue_id, rc);
+               goto err_exit;
+       }
+       txq = &vndev->txqs[rc];
+exit:
        return txq;
+
+err_exit:
+       txq = ERR2PTR(rc);
+       goto exit;
 }
 
 static int virtio_netdev_rxq_info_get(struct uk_netdev *dev,
@@ -398,9 +421,26 @@ static int virtio_netdev_txq_info_get(struct uk_netdev 
*dev,
                                      __u16 queue_id __unused,
                                      struct uk_netdev_queue_info *qinfo)
 {
+       struct virtio_net_device *vndev;
+       struct uk_netdev_tx_queue *txq;
+       int rc = 0;
+
        UK_ASSERT(dev);
        UK_ASSERT(qinfo);
-       return 0;
+
+       vndev = to_virtionetdev(dev);
+       if (unlikely(queue_id >= vndev->max_vqueue_pairs)) {
+               uk_pr_err("Invalid queue_id %"__PRIu16"\n", queue_id);
+               rc = -EINVAL;
+               goto exit;
+       }
+       txq = &vndev->txqs[queue_id];
+       qinfo->nb_min = 1;
+       qinfo->nb_max = txq->max_nb_desc;
+       qinfo->nb_is_power_of_two = 1;
+
+exit:
+       return rc;
 }
 
 static unsigned virtio_net_promisc_get(struct uk_netdev *n)
-- 
2.7.4


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