From patchwork Wed Dec 16 18:38:34 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lorenzo Bianconi X-Patchwork-Id: 11978495 X-Patchwork-Delegate: bpf@iogearbox.net Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-17.0 required=3.0 tests=BAYES_00,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4D968C2BBCD for ; Wed, 16 Dec 2020 19:33:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1333923102 for ; Wed, 16 Dec 2020 19:33:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388767AbgLPTdE (ORCPT ); Wed, 16 Dec 2020 14:33:04 -0500 Received: from mail.kernel.org ([198.145.29.99]:57262 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388753AbgLPTdD (ORCPT ); Wed, 16 Dec 2020 14:33:03 -0500 From: Lorenzo Bianconi Authentication-Results: mail.kernel.org; dkim=permerror (bad message/signature format) To: bpf@vger.kernel.org, netdev@vger.kernel.org Cc: davem@davemloft.net, kuba@kernel.org, ast@kernel.org, daniel@iogearbox.net, brouer@redhat.com, lorenzo.bianconi@redhat.com, toshiaki.makita1@gmail.com Subject: [PATCH bpf-next 2/2] net: xdp: introduce xdp_build_skb_from_frame utility routine Date: Wed, 16 Dec 2020 19:38:34 +0100 Message-Id: <9d24e4c90c91aa2d9de413ee38adc4e8e44fc81a.1608142960.git.lorenzo@kernel.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net Introduce xdp_build_skb_from_frame utility routine to build the skb from xdp_frame. Respect to __xdp_build_skb_from_frame, xdp_build_skb_from_frame will allocate the skb object. Rely on xdp_build_skb_from_frame in veth driver. Signed-off-by: Lorenzo Bianconi Reviewed-by: Toshiaki Makita Acked-by: Jesper Dangaard Brouer --- drivers/net/veth.c | 18 +++--------------- include/net/xdp.h | 2 ++ net/core/xdp.c | 15 +++++++++++++++ 3 files changed, 20 insertions(+), 15 deletions(-) diff --git a/drivers/net/veth.c b/drivers/net/veth.c index 02bfcdf50a7a..dbacf90df2b5 100644 --- a/drivers/net/veth.c +++ b/drivers/net/veth.c @@ -567,16 +567,10 @@ static struct sk_buff *veth_xdp_rcv_one(struct veth_rq *rq, struct veth_xdp_tx_bq *bq, struct veth_stats *stats) { - void *hard_start = frame->data - frame->headroom; - int len = frame->len, delta = 0; struct xdp_frame orig_frame; struct bpf_prog *xdp_prog; - unsigned int headroom; struct sk_buff *skb; - /* bpf_xdp_adjust_head() assures BPF cannot access xdp_frame area */ - hard_start -= sizeof(struct xdp_frame); - rcu_read_lock(); xdp_prog = rcu_dereference(rq->xdp_prog); if (likely(xdp_prog)) { @@ -590,8 +584,8 @@ static struct sk_buff *veth_xdp_rcv_one(struct veth_rq *rq, switch (act) { case XDP_PASS: - delta = frame->data - xdp.data; - len = xdp.data_end - xdp.data; + if (xdp_update_frame_from_buff(&xdp, frame)) + goto err_xdp; break; case XDP_TX: orig_frame = *frame; @@ -629,18 +623,12 @@ static struct sk_buff *veth_xdp_rcv_one(struct veth_rq *rq, } rcu_read_unlock(); - headroom = sizeof(struct xdp_frame) + frame->headroom - delta; - skb = veth_build_skb(hard_start, headroom, len, frame->frame_sz); + skb = xdp_build_skb_from_frame(frame, rq->dev); if (!skb) { xdp_return_frame(frame); stats->rx_drops++; - goto err; } - xdp_release_frame(frame); - xdp_scrub_frame(frame); - skb->protocol = eth_type_trans(skb, rq->dev); -err: return skb; err_xdp: rcu_read_unlock(); diff --git a/include/net/xdp.h b/include/net/xdp.h index da62fa20fa8a..11ec93f827c0 100644 --- a/include/net/xdp.h +++ b/include/net/xdp.h @@ -148,6 +148,8 @@ struct xdp_frame *xdp_convert_zc_to_xdp_frame(struct xdp_buff *xdp); struct sk_buff *__xdp_build_skb_from_frame(struct xdp_frame *xdpf, struct sk_buff *skb, struct net_device *dev); +struct sk_buff *xdp_build_skb_from_frame(struct xdp_frame *xdpf, + struct net_device *dev); static inline void xdp_convert_frame_to_buff(struct xdp_frame *frame, struct xdp_buff *xdp) diff --git a/net/core/xdp.c b/net/core/xdp.c index aeb09ed0704c..0d2630a35c3e 100644 --- a/net/core/xdp.c +++ b/net/core/xdp.c @@ -557,3 +557,18 @@ struct sk_buff *__xdp_build_skb_from_frame(struct xdp_frame *xdpf, return skb; } EXPORT_SYMBOL_GPL(__xdp_build_skb_from_frame); + +struct sk_buff *xdp_build_skb_from_frame(struct xdp_frame *xdpf, + struct net_device *dev) +{ + struct sk_buff *skb; + + skb = kmem_cache_alloc(skbuff_head_cache, GFP_ATOMIC); + if (unlikely(!skb)) + return NULL; + + memset(skb, 0, offsetof(struct sk_buff, tail)); + + return __xdp_build_skb_from_frame(xdpf, skb, dev); +} +EXPORT_SYMBOL_GPL(xdp_build_skb_from_frame);