Commit be09f0d1 authored by Jakub Kicinski's avatar Jakub Kicinski
Browse files

net: netdevsim: hook in XDP handling 



Add basic XDP support by hooking in do_xdp_generic().
This should be enough to validate most basic XDP tests.

Signed-off-by: default avatarMohsin Bashir <mohsin.bashr@gmail.com>
Link: https://patch.msgid.link/20250719083059.3209169-2-mohsin.bashr@gmail.com


Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent 391daec3

drivers/net/netdevsim/netdev.c

+20 −1
Original line number Diff line number Diff line
@@ -387,15 +387,34 @@ static int nsim_get_iflink(const struct net_device *dev) 
static int nsim_rcv(struct nsim_rq *rq, int budget)

{

	struct net_device *dev = rq->napi.dev;

	struct bpf_prog *xdp_prog;

	struct netdevsim *ns;

	struct sk_buff *skb;

	unsigned int skblen;

	int i, ret;



	ns = netdev_priv(dev);

	xdp_prog = READ_ONCE(ns->xdp.prog);



	for (i = 0; i < budget; i++) {

		if (skb_queue_empty(&rq->skb_queue))

			break;



		skb = skb_dequeue(&rq->skb_queue);



		if (xdp_prog) {

			/* skb might be freed directly by XDP, save the len */

			skblen = skb->len;



			if (skb->ip_summed == CHECKSUM_PARTIAL)

				skb_checksum_help(skb);

			ret = do_xdp_generic(xdp_prog, &skb);

			if (ret != XDP_PASS) {

				dev_dstats_rx_add(dev, skblen);

				continue;

			}

		}



		/* skb might be discard at netif_receive_skb, save the len */

		skblen = skb->len;

		skb_mark_napi_id(skb, &rq->napi);
@@ -936,7 +955,7 @@ static void nsim_setup(struct net_device *dev) 
			    NETIF_F_TSO;

	dev->pcpu_stat_type = NETDEV_PCPU_STAT_DSTATS;

	dev->max_mtu = ETH_MAX_MTU;

	dev->xdp_features = NETDEV_XDP_ACT_HW_OFFLOAD;

	dev->xdp_features = NETDEV_XDP_ACT_BASIC | NETDEV_XDP_ACT_HW_OFFLOAD;

}



static int nsim_queue_init(struct netdevsim *ns)