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Wed, 1 Feb 2023 10:25:26 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 567CEC4339B; Wed, 1 Feb 2023 10:25:25 +0000 (UTC) From: Lorenzo Bianconi To: bpf@vger.kernel.org Date: Wed, 1 Feb 2023 11:24:22 +0100 Message-Id: <26a94c33520c0bfba021b3fbb2cb8c1e69bf53b8.1675245258.git.lorenzo@kernel.org> X-Mailer: git-send-email 2.39.1 In-Reply-To: References: MIME-Version: 1.0 X-Mailman-Original-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1675247125; bh=Ur+dLWlKQ0otG4UFn7VvD0yALdMNMxBFLSE1HP4Alw4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=dcVkFCJWZqoYillgHv7GVddudYbtkThBfIt+p5QrYjqpdPCI/ia0V4CijeoFR1anq NdiebpjpS2QGgbo/eSa5UpUTZkb/r7GR6FZw7saATqSyyV9DWPPUKh/qQBrvDQQ82w XBzZoVlvuz9YL66nU0DLLruiiTcDBX7fkWVsP2IpsnjdvesW5w5o7QRztvoRlNtP+u A04NYkppwLzkh22bz5UIP2G9agv949A21JL1Uez2Rh99PWvKgvOlLd2LN5m4zBCl7U TVux6ZoNjyV7/RE21qvhai/t/bkBlMGI1a7hsUNbuQBumoC2Ys7lrCGTOgjmFWo/XR KI1/V9NT4xj3A== X-Mailman-Original-Authentication-Results: smtp1.osuosl.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20201202 header.b=dcVkFCJW Subject: [Intel-wired-lan] [PATCH v5 bpf-next 6/8] bpf: devmap: check XDP features in __xdp_enqueue routine X-BeenThere: intel-wired-lan@osuosl.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel Wired Ethernet Linux Kernel Driver Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mst@redhat.com, vladimir.oltean@nxp.com, ast@kernel.org, edumazet@google.com, anthony.l.nguyen@intel.com, sdf@google.com, gerhard@engleder-embedded.com, daniel@iogearbox.net, andrii@kernel.org, intel-wired-lan@lists.osuosl.org, simon.horman@corigine.com, kuba@kernel.org, pabeni@redhat.com, aelior@marvell.com, hawk@kernel.org, christophe.jaillet@wanadoo.fr, memxor@gmail.com, john@phrozen.org, bjorn@kernel.org, magnus.karlsson@intel.com, leon@kernel.org, netdev@vger.kernel.org, toke@redhat.com, martin.lau@linux.dev, ecree.xilinx@gmail.com, alardam@gmail.com, gospo@broadcom.com, saeedm@nvidia.com, davem@davemloft.net, nbd@nbd.name Errors-To: intel-wired-lan-bounces@osuosl.org Sender: "Intel-wired-lan" Check if the destination device implements ndo_xdp_xmit callback relying on NETDEV_XDP_ACT_NDO_XMIT flags. Moreover, check if the destination device supports XDP non-linear frame in __xdp_enqueue and is_valid_dst routines. This patch allows to perform XDP_REDIRECT on non-linear XDP buffers. Acked-by: Jesper Dangaard Brouer Co-developed-by: Kumar Kartikeya Dwivedi Signed-off-by: Kumar Kartikeya Dwivedi Signed-off-by: Lorenzo Bianconi --- kernel/bpf/devmap.c | 16 +++++++++++++--- net/core/filter.c | 13 +++++-------- 2 files changed, 18 insertions(+), 11 deletions(-) diff --git a/kernel/bpf/devmap.c b/kernel/bpf/devmap.c index d01e4c55b376..2675fefc6cb6 100644 --- a/kernel/bpf/devmap.c +++ b/kernel/bpf/devmap.c @@ -474,7 +474,11 @@ static inline int __xdp_enqueue(struct net_device *dev, struct xdp_frame *xdpf, { int err; - if (!dev->netdev_ops->ndo_xdp_xmit) + if (!(dev->xdp_features & NETDEV_XDP_ACT_NDO_XMIT)) + return -EOPNOTSUPP; + + if (unlikely(!(dev->xdp_features & NETDEV_XDP_ACT_NDO_XMIT_SG) && + xdp_frame_has_frags(xdpf))) return -EOPNOTSUPP; err = xdp_ok_fwd_dev(dev, xdp_get_frame_len(xdpf)); @@ -532,8 +536,14 @@ int dev_map_enqueue(struct bpf_dtab_netdev *dst, struct xdp_frame *xdpf, static bool is_valid_dst(struct bpf_dtab_netdev *obj, struct xdp_frame *xdpf) { - if (!obj || - !obj->dev->netdev_ops->ndo_xdp_xmit) + if (!obj) + return false; + + if (!(obj->dev->xdp_features & NETDEV_XDP_ACT_NDO_XMIT)) + return false; + + if (unlikely(!(obj->dev->xdp_features & NETDEV_XDP_ACT_NDO_XMIT_SG) && + xdp_frame_has_frags(xdpf))) return false; if (xdp_ok_fwd_dev(obj->dev, xdp_get_frame_len(xdpf))) diff --git a/net/core/filter.c b/net/core/filter.c index 0039cf16713e..2ce06a72a5ba 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -4318,16 +4318,13 @@ int xdp_do_redirect(struct net_device *dev, struct xdp_buff *xdp, struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); enum bpf_map_type map_type = ri->map_type; - /* XDP_REDIRECT is not fully supported yet for xdp frags since - * not all XDP capable drivers can map non-linear xdp_frame in - * ndo_xdp_xmit. - */ - if (unlikely(xdp_buff_has_frags(xdp) && - map_type != BPF_MAP_TYPE_CPUMAP)) - return -EOPNOTSUPP; + if (map_type == BPF_MAP_TYPE_XSKMAP) { + /* XDP_REDIRECT is not supported AF_XDP yet. */ + if (unlikely(xdp_buff_has_frags(xdp))) + return -EOPNOTSUPP; - if (map_type == BPF_MAP_TYPE_XSKMAP) return __xdp_do_redirect_xsk(ri, dev, xdp, xdp_prog); + } return __xdp_do_redirect_frame(ri, dev, xdp_convert_buff_to_frame(xdp), xdp_prog);