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
diff --git a/src/vnet/devices/virtio/virtio.h b/src/vnet/devices/virtio/virtio.h
index b00e1ec..acefc38 100644
--- a/src/vnet/devices/virtio/virtio.h
+++ b/src/vnet/devices/virtio/virtio.h
@@ -20,6 +20,7 @@
#include <vnet/devices/virtio/virtio_std.h>
#include <vnet/devices/virtio/vhost_std.h>
+#include <vnet/devices/virtio/virtio_buffering.h>
#include <vnet/gso/gro.h>
#define foreach_virtio_if_flag \
@@ -76,6 +77,7 @@
u16 last_used_idx;
u16 last_kick_avail_idx;
u32 call_file_index;
+ virtio_vring_buffering_t *buffering;
gro_flow_table_t *flow_table;
} virtio_vring_t;
@@ -123,6 +125,7 @@
CLIB_CACHE_LINE_ALIGN_MARK (cacheline1);
int packet_coalesce;
+ int packet_buffering;
u32 dev_instance;
u32 numa_node;
u64 remote_features;
@@ -203,6 +206,7 @@
extern void virtio_show (vlib_main_t * vm, u32 * hw_if_indices, u8 show_descr,
u32 type);
extern void virtio_set_packet_coalesce (virtio_if_t * vif);
+clib_error_t *virtio_set_packet_buffering (virtio_if_t * vif, u16 size);
extern void virtio_pci_legacy_notify_queue (vlib_main_t * vm,
virtio_if_t * vif, u16 queue_id);
extern void virtio_pci_modern_notify_queue (vlib_main_t * vm,