Commit e016cf5f authored Mar 11, 2025 by Jakub Kicinski

netdevsim: 'support' multi-buf XDP



Don't error out on large MTU if XDP is multi-buf.
The ping test now tests ping with XDP and high MTU.
netdevsim doesn't actually run the prog (yet?) so
it doesn't matter if the prog was multi-buf..

Reviewed-by: Michal Kubiak <michal.kubiak@intel.com>
Link: https://patch.msgid.link/20250311092820.542148-1-kuba@kernel.org


Signed-off-by: Jakub Kicinski <kuba@kernel.org>

parent 3552138a

drivers/net/netdevsim/bpf.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -296,7 +296,8 @@ static int nsim_setup_prog_checks(struct netdevsim ns, struct netdev_bpf bpf)
		NSIM_EA(bpf->extack, "attempt to load offloaded prog to drv");
		return -EINVAL;
		}
		if (ns->netdev->mtu > NSIM_XDP_MAX_MTU) {
		if (bpf->prog && !bpf->prog->aux->xdp_has_frags &&
		ns->netdev->mtu > NSIM_XDP_MAX_MTU) {
		NSIM_EA(bpf->extack, "MTU too large w/ XDP enabled");
		return -EINVAL;
		}

drivers/net/netdevsim/netdev.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -116,7 +116,8 @@ static int nsim_change_mtu(struct net_device *dev, int new_mtu)
		{
		struct netdevsim *ns = netdev_priv(dev);

		if (ns->xdp.prog && new_mtu > NSIM_XDP_MAX_MTU)
		if (ns->xdp.prog && !ns->xdp.prog->aux->xdp_has_frags &&
		new_mtu > NSIM_XDP_MAX_MTU)
		return -EBUSY;

		WRITE_ONCE(dev->mtu, new_mtu);