netdev - [PATCH net-next V5 1/5] net: netdevsim: hook in XDP handling

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Message-ID: <20250715210553.1568963-2-mohsin.bashr@gmail.com>
Date: Tue, 15 Jul 2025 14:05:49 -0700
From: Mohsin Bashir <mohsin.bashr@...il.com>
To: netdev@...r.kernel.org
Cc: kuba@...nel.org,
	andrew+netdev@...n.ch,
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Subject: [PATCH net-next V5 1/5] net: netdevsim: hook in XDP handling

From: Jakub Kicinski <kuba@...nel.org>

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

Signed-off-by: Jakub Kicinski <kuba@...nel.org>
Signed-off-by: Mohsin Bashir <mohsin.bashr@...il.com>
---
 drivers/net/netdevsim/netdev.c | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/drivers/net/netdevsim/netdev.c b/drivers/net/netdevsim/netdev.c
index 611e7f65291c..ba637bd0971a 100644
--- a/drivers/net/netdevsim/netdev.c
+++ b/drivers/net/netdevsim/netdev.c
@@ -387,15 +387,32 @@ 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;
+
+			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 +953,7 @@ 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)
-- 
2.47.1