Commit 358008f4 authored by Jakub Kicinski's avatar Jakub Kicinski
Browse files

netdevsim: add loopback support 



Support device loopback. Apparently this mode has been historically
supported by the toeplitz test and I don't have any HW which lets
me test the conversion..

Reviewed-by: default avatarPetr Machata <petrm@nvidia.com>
Reviewed-by: default avatarWillem de Bruijn <willemb@google.com>
Link: https://patch.msgid.link/20251120021024.2944527-12-kuba@kernel.org


Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent 9cf9aa77

drivers/net/netdevsim/netdev.c

+12 −5
Original line number Diff line number Diff line
@@ -133,15 +133,21 @@ static netdev_tx_t nsim_start_xmit(struct sk_buff *skb, struct net_device *dev) 
	if (!nsim_ipsec_tx(ns, skb))

		goto out_drop_any;



	/* Check if loopback mode is enabled */

	if (dev->features & NETIF_F_LOOPBACK) {

		peer_ns = ns;

		peer_dev = dev;

	} else {

		peer_ns = rcu_dereference(ns->peer);

		if (!peer_ns)

			goto out_drop_any;

		peer_dev = peer_ns->netdev;

	}



	dr = nsim_do_psp(skb, ns, peer_ns, &psp_ext);

	if (dr)

		goto out_drop_free;



	peer_dev = peer_ns->netdev;

	rxq = skb_get_queue_mapping(skb);

	if (rxq >= peer_dev->num_rx_queues)

		rxq = rxq % peer_dev->num_rx_queues;
@@ -976,7 +982,8 @@ static void nsim_setup(struct net_device *dev) 
			    NETIF_F_FRAGLIST |

			    NETIF_F_HW_CSUM |

			    NETIF_F_LRO |

			    NETIF_F_TSO;

			    NETIF_F_TSO |

			    NETIF_F_LOOPBACK;

	dev->pcpu_stat_type = NETDEV_PCPU_STAT_DSTATS;

	dev->max_mtu = ETH_MAX_MTU;

	dev->xdp_features = NETDEV_XDP_ACT_BASIC | NETDEV_XDP_ACT_HW_OFFLOAD;