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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: Petr Machata <petrm@nvidia.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://patch.msgid.link/20251120021024.2944527-12-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jakub Kicinski 2025-11-19 18:10:23 -08:00
parent 9cf9aa77a1
commit 358008f41d
1 changed files with 12 additions and 5 deletions
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17
drivers/net/netdevsim/netdev.c
View File

@ -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;
peer_ns = rcu_dereference(ns->peer);
if (!peer_ns)
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;