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net: virtio_net: notifications coalescing support

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New VirtIO network feature: VIRTIO_NET_F_NOTF_COAL.

Control a Virtio network device notifications coalescing parameters
using the control virtqueue.

A device that supports this fetature can receive
VIRTIO_NET_CTRL_NOTF_COAL control commands.

- VIRTIO_NET_CTRL_NOTF_COAL_TX_SET:
  Ask the network device to change the following parameters:
  - tx_usecs: Maximum number of usecs to delay a TX notification.
  - tx_max_packets: Maximum number of packets to send before a
    TX notification.

- VIRTIO_NET_CTRL_NOTF_COAL_RX_SET:
  Ask the network device to change the following parameters:
  - rx_usecs: Maximum number of usecs to delay a RX notification.
  - rx_max_packets: Maximum number of packets to receive before a
    RX notification.

VirtIO spec. patch:
https://lists.oasis-open.org/archives/virtio-comment/202206/msg00100.html

Signed-off-by: Alvaro Karsz <alvaro.karsz@solid-run.com>
Message-Id: <20220718091102.498774-1-alvaro.karsz@solid-run.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Jakub Kicinski <kuba@kernel.org>
Acked-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Alvaro Karsz 2022-07-18 12:11:02 +03:00 • committed by Michael S. Tsirkin
parent 95bf979877
commit 699b045a8e
2 changed files with 129 additions and 16 deletions
Download patch file Download diff file Expand all files Collapse all files

34
include/uapi/linux/virtio_net.h
View file

@ -56,7 +56,7 @@
#define VIRTIO_NET_F_MQ 22 /* Device supports Receive Flow
* Steering */
#define VIRTIO_NET_F_CTRL_MAC_ADDR 23 /* Set MAC address */
#define VIRTIO_NET_F_NOTF_COAL 53 /* Guest can handle notifications coalescing */
#define VIRTIO_NET_F_HASH_REPORT 57 /* Supports hash report */
#define VIRTIO_NET_F_RSS 60 /* Supports RSS RX steering */
#define VIRTIO_NET_F_RSC_EXT 61 /* extended coalescing info */
@ -355,4 +355,36 @@ struct virtio_net_hash_config {
#define VIRTIO_NET_CTRL_GUEST_OFFLOADS 5
#define VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET 0
/*
* Control notifications coalescing.
*
* Request the device to change the notifications coalescing parameters.
*
* Available with the VIRTIO_NET_F_NOTF_COAL feature bit.
*/
#define VIRTIO_NET_CTRL_NOTF_COAL 6
/*
* Set the tx-usecs/tx-max-packets patameters.
* tx-usecs - Maximum number of usecs to delay a TX notification.
* tx-max-packets - Maximum number of packets to send before a TX notification.
*/
struct virtio_net_ctrl_coal_tx {
__le32 tx_max_packets;
__le32 tx_usecs;
};
#define VIRTIO_NET_CTRL_NOTF_COAL_TX_SET 0
/*
* Set the rx-usecs/rx-max-packets patameters.
* rx-usecs - Maximum number of usecs to delay a RX notification.
* rx-max-frames - Maximum number of packets to receive before a RX notification.
*/
struct virtio_net_ctrl_coal_rx {
__le32 rx_max_packets;
__le32 rx_usecs;
};
#define VIRTIO_NET_CTRL_NOTF_COAL_RX_SET 1
#endif /* _UAPI_LINUX_VIRTIO_NET_H */