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authorMohsin Kazmi <sykazmi@cisco.com>2020-09-28 10:26:33 +0000
committerBeno�t Ganne <bganne@cisco.com>2020-09-28 16:47:30 +0000
commite347acbc31111504c015531e8ad764a86d489309 (patch)
tree3a72d961fd97b9ce7985865d89b0c45d27cab2fc /src/vnet/devices/virtio/pci.c
parent7741afaf5c66a5d7ed1d2d76ae36a81ec24fdaaa (diff)
virtio: add packet buffering on tx
Type: feature This patch adds packet buffering on tx for slow backend which have some jitter/delays in freeing the vrings. There are some limitations to the current design: 1) It only works in poll mode. 2) Atleast 1 rx queue of an interface (with buffering enabled) should be placed on each worker and main thread. Signed-off-by: Mohsin Kazmi <sykazmi@cisco.com> Change-Id: Ib93c350298b228e80426e58ac77f3bbc93b8be27
Diffstat (limited to 'src/vnet/devices/virtio/pci.c')
-rw-r--r--src/vnet/devices/virtio/pci.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/src/vnet/devices/virtio/pci.c b/src/vnet/devices/virtio/pci.c
index df8e2bdaf68..71d813abfd7 100644
--- a/src/vnet/devices/virtio/pci.c
+++ b/src/vnet/devices/virtio/pci.c
@@ -1154,6 +1154,19 @@ virtio_pci_create_if (vlib_main_t * vm, virtio_pci_create_if_args_t * args)
vnet_hw_interface_t *hw = vnet_get_hw_interface (vnm, vif->hw_if_index);
hw->flags |= VNET_HW_INTERFACE_FLAG_SUPPORTS_INT_MODE;
+
+ if (args->virtio_flags & VIRTIO_FLAG_BUFFERING)
+ {
+ error = virtio_set_packet_buffering (vif, args->buffering_size);
+ if (error)
+ {
+ args->rv = VNET_API_ERROR_INIT_FAILED;
+ virtio_log_error (vif,
+ "error encountered during packet buffering init");
+ goto error;
+ }
+ }
+
vnet_hw_interface_set_input_node (vnm, vif->hw_if_index,
virtio_input_node.index);
u32 i = 0;