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Sat, 19 Jul 2025 01:31:25 -0700 (PDT) From: Mohsin Bashir To: netdev@vger.kernel.org Cc: kuba@kernel.org, andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com, pabeni@redhat.com, shuah@kernel.org, horms@kernel.org, cratiu@nvidia.com, noren@nvidia.com, cjubran@nvidia.com, mbloch@nvidia.com, mohsin.bashr@gmail.com, jdamato@fastly.com, gal@nvidia.com, sdf@fomichev.me, ast@kernel.org, daniel@iogearbox.net, hawk@kernel.org, john.fastabend@gmail.com, nathan@kernel.org, nick.desaulniers+lkml@gmail.com, morbo@google.com, justinstitt@google.com, bpf@vger.kernel.org, linux-kselftest@vger.kernel.org, llvm@lists.linux.dev Subject: [PATCH net-next V6 1/5] net: netdevsim: hook in XDP handling Date: Sat, 19 Jul 2025 01:30:55 -0700 Message-ID: <20250719083059.3209169-2-mohsin.bashr@gmail.com> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20250719083059.3209169-1-mohsin.bashr@gmail.com> References: <20250719083059.3209169-1-mohsin.bashr@gmail.com> Precedence: bulk X-Mailing-List: llvm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Jakub Kicinski 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 Signed-off-by: Mohsin Bashir --- drivers/net/netdevsim/netdev.c | 21 ++++++++++++++++++++- 1 file changed, 20 insertions(+), 1 deletion(-) diff --git a/drivers/net/netdevsim/netdev.c b/drivers/net/netdevsim/netdev.c index 611e7f65291c..a7628f5c09af 100644 --- a/drivers/net/netdevsim/netdev.c +++ b/drivers/net/netdevsim/netdev.c @@ -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) -- 2.47.1