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net: netdevsim: hook in XDP handling

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

Signed-off-by: Mohsin Bashir <mohsin.bashr@gmail.com>
Link: https://patch.msgid.link/20250719083059.3209169-2-mohsin.bashr@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jakub Kicinski
2025-07-19 01:30:55 -07:00
parent 391daec35b
commit be09f0d1ac
1 changed files with 20 additions and 1 deletions
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21
drivers/net/netdevsim/netdev.c
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@@ -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)