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Merge branch 'netkit-support-for-io_uring-zero-copy-and-af_xdp'

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Daniel Borkmann says:

====================
netkit: Support for io_uring zero-copy and AF_XDP

Containers use virtual netdevs to route traffic from a physical netdev
in the host namespace. They do not have access to the physical netdev
in the host and thus can't use memory providers or AF_XDP that require
reconfiguring/restarting queues in the physical netdev.

This patchset adds the concept of queue leasing to virtual netdevs that
allow containers to use memory providers and AF_XDP at native speed.
Leased queues are bound to a real queue in a physical netdev and act
as a proxy.

Memory providers and AF_XDP operations take an ifindex and queue id,
so containers would pass in an ifindex for a virtual netdev and a queue
id of a leased queue, which then gets proxied to the underlying real
queue.

We have implemented support for this concept in netkit and tested the
latter against Nvidia ConnectX-6 (mlx5) as well as Broadcom BCM957504
(bnxt_en) 100G NICs. For more details see the individual patches.
====================

Link: https://patch.msgid.link/20260402231031.447597-1-daniel@iogearbox.net
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jakub Kicinski
2026-04-09 18:24:34 -07:00
parent b6e39e4846 65d657d806
commit 1508922588
26 changed files with 2560 additions and 167 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
include/uapi/linux/if_link.h
View File

@@ -1296,6 +1296,11 @@ enum netkit_mode {
NETKIT_L3,
};
enum netkit_pairing {
NETKIT_DEVICE_PAIR,
NETKIT_DEVICE_SINGLE,
};
/* NETKIT_SCRUB_NONE leaves clearing skb->{mark,priority} up to
* the BPF program if attached. This also means the latter can
* consume the two fields if they were populated earlier.
@@ -1320,6 +1325,7 @@ enum {
IFLA_NETKIT_PEER_SCRUB,
IFLA_NETKIT_HEADROOM,
IFLA_NETKIT_TAILROOM,
IFLA_NETKIT_PAIRING,
__IFLA_NETKIT_MAX,
};
#define IFLA_NETKIT_MAX (__IFLA_NETKIT_MAX - 1)

11
include/uapi/linux/netdev.h
View File

@@ -160,6 +160,7 @@ enum {
NETDEV_A_QUEUE_DMABUF,
NETDEV_A_QUEUE_IO_URING,
NETDEV_A_QUEUE_XSK,
NETDEV_A_QUEUE_LEASE,
__NETDEV_A_QUEUE_MAX,
NETDEV_A_QUEUE_MAX = (__NETDEV_A_QUEUE_MAX - 1)
@@ -202,6 +203,15 @@ enum {
NETDEV_A_QSTATS_MAX = (__NETDEV_A_QSTATS_MAX - 1)
};
enum {
NETDEV_A_LEASE_IFINDEX = 1,
NETDEV_A_LEASE_QUEUE,
NETDEV_A_LEASE_NETNS_ID,
__NETDEV_A_LEASE_MAX,
NETDEV_A_LEASE_MAX = (__NETDEV_A_LEASE_MAX - 1)
};
enum {
NETDEV_A_DMABUF_IFINDEX = 1,
NETDEV_A_DMABUF_QUEUES,
@@ -228,6 +238,7 @@ enum {
NETDEV_CMD_BIND_RX,
NETDEV_CMD_NAPI_SET,
NETDEV_CMD_BIND_TX,
NETDEV_CMD_QUEUE_CREATE,
__NETDEV_CMD_MAX,
NETDEV_CMD_MAX = (__NETDEV_CMD_MAX - 1)