From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8C987299954; Thu, 20 Nov 2025 02:10:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763604649; cv=none; b=lAEzMrRBwpvRm86X75nbJtMrIlOJ3UoQ80mMqYz6IntRuU/rLOzuIqDZd5wGw7kl4wSr0lsWe36V0EruT1wofIYdBIN/1rxz5tqcsErU8IzohK5DDcwJR4AWAwMlUzxNKjJOU/WT6Yb/o0pkl3H7+merqhqgZtdADvXZbsQFOr8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763604649; c=relaxed/simple; bh=GGPnlgX2iQobN3wb/SWRFZZFbrk4oYQx4oWmCoBkq4s=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=sssKhhHeHhpj+fiwXBNiiVy8hejBrXPXhS+4IMjOZflLEvV+oH/Yrt5Kh0jhIMcz67h7LoaRodvyu2FVqjGej48cXlW//ms5DaVUtC/eYarRnkKGKDq3d3Hm5lsoip7Bppg34kNrRZOURKaqF16MbVZ8PXlZRFjThENqTR6NNxk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=kac52/W6; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="kac52/W6" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D3D3FC116D0; Thu, 20 Nov 2025 02:10:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1763604649; bh=GGPnlgX2iQobN3wb/SWRFZZFbrk4oYQx4oWmCoBkq4s=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=kac52/W6mgBiHc9NFId0xxz5cfGnHiW8meKwe/7PlRmP0vn/n1X5OSpssDAeN3p6K kIem53IIoWqCkq+GwGcbWPivfqujamcae8V1yHw4NO2EhuJ8nioySIjG74jw8w88zX JoQ8Odv0OUWK/dC/8wuRPxyBl5kuntyfXvMwEh3xZhUMedHV6kSbZJnUvLwrXL4UiV 2AWuzrYKFCGj8jf71ubI6V9EjB/mX1Ax0id5fN1JWzSfFd0tvYTKlJgJEgWF2wRlQb Ek4+2zXqkGo6sMNTnTkPiomZQOp0j3UV0Dzz5KlZq7DzG+XIoeop/nwsr6ru5zE3qG /nz8q7xBlqNlw== From: Jakub Kicinski To: davem@davemloft.net Cc: netdev@vger.kernel.org, edumazet@google.com, pabeni@redhat.com, andrew+netdev@lunn.ch, horms@kernel.org, willemdebruijn.kernel@gmail.com, shuah@kernel.org, sdf@fomichev.me, krakauer@google.com, linux-kselftest@vger.kernel.org, petrm@nvidia.com, matttbe@kernel.org, Jakub Kicinski , Willem de Bruijn Subject: [PATCH net-next v3 11/12] netdevsim: add loopback support Date: Wed, 19 Nov 2025 18:10:23 -0800 Message-ID: <20251120021024.2944527-12-kuba@kernel.org> X-Mailer: git-send-email 2.51.1 In-Reply-To: <20251120021024.2944527-1-kuba@kernel.org> References: <20251120021024.2944527-1-kuba@kernel.org> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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 Reviewed-by: Willem de Bruijn Signed-off-by: Jakub Kicinski --- drivers/net/netdevsim/netdev.c | 17 ++++++++++++----- 1 file changed, 12 insertions(+), 5 deletions(-) diff --git a/drivers/net/netdevsim/netdev.c b/drivers/net/netdevsim/netdev.c index 2b713db16cd0..6927c1962277 100644 --- a/drivers/net/netdevsim/netdev.c +++ b/drivers/net/netdevsim/netdev.c @@ -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; -- 2.51.1