From patchwork Tue Apr 18 13:30:47 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jesper Dangaard Brouer X-Patchwork-Id: 13215724 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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0B7C6C6FD18 for ; Tue, 18 Apr 2023 13:31:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231816AbjDRNbj (ORCPT ); Tue, 18 Apr 2023 09:31:39 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50070 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229535AbjDRNbh (ORCPT ); Tue, 18 Apr 2023 09:31:37 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0272915478 for ; Tue, 18 Apr 2023 06:30:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1681824653; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=s+Y/+d2DHAvX2dx/BnZZeyLeqZ6PrSxKqotJvAsNqb8=; b=flpDeeAmZjwerzOVPgr6nVXME+CmVc4McYEHLXc9gZcv+/KOXbRjGBrdYjfg0vPeBkvEJh +PeTT/fPNAwr3khsMa+LUPh8ELm3zGylVSiZqKnGKjKbfuGWZl8w4fdNUMPMQ8kW82YF9m J5XQKVDoIXQck+Ug3Yv9d/Jn4keP4r8= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-648-M3qm-VqHPhe-2EZbfBelfg-1; Tue, 18 Apr 2023 09:30:49 -0400 X-MC-Unique: M3qm-VqHPhe-2EZbfBelfg-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.rdu2.redhat.com [10.11.54.2]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id BCAD93850546; Tue, 18 Apr 2023 13:30:48 +0000 (UTC) Received: from firesoul.localdomain (unknown [10.45.242.22]) by smtp.corp.redhat.com (Postfix) with ESMTP id 7708F40C6E70; Tue, 18 Apr 2023 13:30:48 +0000 (UTC) Received: from [10.1.1.1] (localhost [IPv6:::1]) by firesoul.localdomain (Postfix) with ESMTP id CCEBD307372E8; Tue, 18 Apr 2023 15:30:47 +0200 (CEST) Subject: [PATCH bpf-next V2 2/5] igc: add igc_xdp_buff wrapper for xdp_buff in driver From: Jesper Dangaard Brouer To: bpf@vger.kernel.org, Stanislav Fomichev , =?utf-8?q?Toke?= =?utf-8?q?_H=C3=B8iland-J=C3=B8rgensen?= Cc: Jesper Dangaard Brouer , netdev@vger.kernel.org, martin.lau@kernel.org, ast@kernel.org, daniel@iogearbox.net, alexandr.lobakin@intel.com, larysa.zaremba@intel.com, xdp-hints@xdp-project.net, yoong.siang.song@intel.com, intel-wired-lan@lists.osuosl.org, pabeni@redhat.com, jesse.brandeburg@intel.com, kuba@kernel.org, edumazet@google.com, john.fastabend@gmail.com, hawk@kernel.org, davem@davemloft.net Date: Tue, 18 Apr 2023 15:30:47 +0200 Message-ID: <168182464779.616355.3761989884165609387.stgit@firesoul> In-Reply-To: <168182460362.616355.14591423386485175723.stgit@firesoul> References: <168182460362.616355.14591423386485175723.stgit@firesoul> User-Agent: StGit/1.4 MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.2 Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net Driver specific metadata data for XDP-hints kfuncs are propagated via tail extending the struct xdp_buff with a locally scoped driver struct. Zero-Copy AF_XDP/XSK does similar tricks via struct xdp_buff_xsk. This xdp_buff_xsk struct contains a CB area (24 bytes) that can be used for extending the locally scoped driver into. The XSK_CHECK_PRIV_TYPE define catch size violations build time. The changes needed for AF_XDP zero-copy in igc_clean_rx_irq_zc() is done in next patch, because the member rx_desc isn't available at this point. Signed-off-by: Jesper Dangaard Brouer --- drivers/net/ethernet/intel/igc/igc.h | 5 +++++ drivers/net/ethernet/intel/igc/igc_main.c | 16 +++++++++------- 2 files changed, 14 insertions(+), 7 deletions(-) diff --git a/drivers/net/ethernet/intel/igc/igc.h b/drivers/net/ethernet/intel/igc/igc.h index f7f9e217e7b4..76a5115aefc8 100644 --- a/drivers/net/ethernet/intel/igc/igc.h +++ b/drivers/net/ethernet/intel/igc/igc.h @@ -499,6 +499,11 @@ struct igc_rx_buffer { }; }; +/* context wrapper around xdp_buff to provide access to descriptor metadata */ +struct igc_xdp_buff { + struct xdp_buff xdp; +}; + struct igc_q_vector { struct igc_adapter *adapter; /* backlink */ void __iomem *itr_register; diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c index bfa9768d447f..6a4c7cd706bd 100644 --- a/drivers/net/ethernet/intel/igc/igc_main.c +++ b/drivers/net/ethernet/intel/igc/igc_main.c @@ -2236,6 +2236,8 @@ static bool igc_alloc_rx_buffers_zc(struct igc_ring *ring, u16 count) if (!count) return ok; + XSK_CHECK_PRIV_TYPE(struct igc_xdp_buff); + desc = IGC_RX_DESC(ring, i); bi = &ring->rx_buffer_info[i]; i -= ring->count; @@ -2520,8 +2522,8 @@ static int igc_clean_rx_irq(struct igc_q_vector *q_vector, const int budget) union igc_adv_rx_desc *rx_desc; struct igc_rx_buffer *rx_buffer; unsigned int size, truesize; + struct igc_xdp_buff ctx; ktime_t timestamp = 0; - struct xdp_buff xdp; int pkt_offset = 0; void *pktbuf; @@ -2555,13 +2557,13 @@ static int igc_clean_rx_irq(struct igc_q_vector *q_vector, const int budget) } if (!skb) { - xdp_init_buff(&xdp, truesize, &rx_ring->xdp_rxq); - xdp_prepare_buff(&xdp, pktbuf - igc_rx_offset(rx_ring), + xdp_init_buff(&ctx.xdp, truesize, &rx_ring->xdp_rxq); + xdp_prepare_buff(&ctx.xdp, pktbuf - igc_rx_offset(rx_ring), igc_rx_offset(rx_ring) + pkt_offset, size, true); - xdp_buff_clear_frags_flag(&xdp); + xdp_buff_clear_frags_flag(&ctx.xdp); - skb = igc_xdp_run_prog(adapter, &xdp); + skb = igc_xdp_run_prog(adapter, &ctx.xdp); } if (IS_ERR(skb)) { @@ -2583,9 +2585,9 @@ static int igc_clean_rx_irq(struct igc_q_vector *q_vector, const int budget) } else if (skb) igc_add_rx_frag(rx_ring, rx_buffer, skb, size); else if (ring_uses_build_skb(rx_ring)) - skb = igc_build_skb(rx_ring, rx_buffer, &xdp); + skb = igc_build_skb(rx_ring, rx_buffer, &ctx.xdp); else - skb = igc_construct_skb(rx_ring, rx_buffer, &xdp, + skb = igc_construct_skb(rx_ring, rx_buffer, &ctx.xdp, timestamp); /* exit if we failed to retrieve a buffer */