From mboxrd@z Thu Jan 1 00:00:00 1970 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=-19.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,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 C2097C433F5 for ; Fri, 10 Sep 2021 16:15:12 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A1B136124D for ; Fri, 10 Sep 2021 16:15:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233654AbhIJQQW (ORCPT ); Fri, 10 Sep 2021 12:16:22 -0400 Received: from mail.kernel.org ([198.145.29.99]:41110 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232504AbhIJQQF (ORCPT ); Fri, 10 Sep 2021 12:16:05 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 6980161242; Fri, 10 Sep 2021 16:14:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1631290494; bh=BN3R5GyK+hWO2xbaXSoJqLzFw51s0h56OxTheJUc80I=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=d6H1pY2Bnzp4ZG1YmOdtkByS8fchBAQjEDVyfTGRgdBIdGtk9v0EQciZpzR0xkSjN MG+dXscD9ECpdpogy/pothcOYu6ro5Q2n4tEdSYutQ8+f4WH/d7ZTevkJg7xSvNQaw JhPPH37jOfnezYiJmbUXQxUOrlm8d6UDLJGVPz52/YpicP6O2h4zySTs9uUDbC7GkP FhV5RKmxOcA7u4Jw4fE8N2lwNMYE2HX/XmjwIj/r4oQRHWxBt5Q0tzIUhO2/MeC85V /Q69kMYZacoKOxJEQNjbfuF4gaK+0miS3p26u9CWCq30xEynTlF7T/lOXSAMWVtSva 2xTyXuX5rn0Uw== From: Lorenzo Bianconi To: bpf@vger.kernel.org, netdev@vger.kernel.org Cc: lorenzo.bianconi@redhat.com, davem@davemloft.net, kuba@kernel.org, ast@kernel.org, daniel@iogearbox.net, shayagr@amazon.com, john.fastabend@gmail.com, dsahern@kernel.org, brouer@redhat.com, echaudro@redhat.com, jasowang@redhat.com, alexander.duyck@gmail.com, saeed@kernel.org, maciej.fijalkowski@intel.com, magnus.karlsson@intel.com, tirthendu.sarkar@intel.com, toke@redhat.com Subject: [PATCH v14 bpf-next 02/18] xdp: introduce flags field in xdp_buff/xdp_frame Date: Fri, 10 Sep 2021 18:14:08 +0200 Message-Id: X-Mailer: git-send-email 2.31.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org Introduce flags field in xdp_frame and xdp_buffer data structures to define additional buffer features. At the moment the only supported buffer feature is multi-buffer bit (mb). Multi-buffer bit is used to specify if this is a linear buffer (mb = 0) or a multi-buffer frame (mb = 1). In the latter case the driver is expected to initialize the skb_shared_info structure at the end of the first buffer to link together subsequent buffers belonging to the same frame. Acked-by: John Fastabend Signed-off-by: Lorenzo Bianconi --- include/net/xdp.h | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) diff --git a/include/net/xdp.h b/include/net/xdp.h index ad5b02dcb6f4..fd31cc33aa4f 100644 --- a/include/net/xdp.h +++ b/include/net/xdp.h @@ -66,6 +66,10 @@ struct xdp_txq_info { struct net_device *dev; }; +enum xdp_buff_flags { + XDP_FLAGS_MULTI_BUFF = BIT(0), /* non-linear xdp buff */ +}; + struct xdp_buff { void *data; void *data_end; @@ -74,13 +78,30 @@ struct xdp_buff { struct xdp_rxq_info *rxq; struct xdp_txq_info *txq; u32 frame_sz; /* frame size to deduce data_hard_end/reserved tailroom*/ + u32 flags; /* supported values defined in xdp_buff_flags */ }; +static __always_inline bool xdp_buff_is_mb(struct xdp_buff *xdp) +{ + return !!(xdp->flags & XDP_FLAGS_MULTI_BUFF); +} + +static __always_inline void xdp_buff_set_mb(struct xdp_buff *xdp) +{ + xdp->flags |= XDP_FLAGS_MULTI_BUFF; +} + +static __always_inline void xdp_buff_clear_mb(struct xdp_buff *xdp) +{ + xdp->flags &= ~XDP_FLAGS_MULTI_BUFF; +} + static __always_inline void xdp_init_buff(struct xdp_buff *xdp, u32 frame_sz, struct xdp_rxq_info *rxq) { xdp->frame_sz = frame_sz; xdp->rxq = rxq; + xdp->flags = 0; } static __always_inline void @@ -122,8 +143,14 @@ struct xdp_frame { */ struct xdp_mem_info mem; struct net_device *dev_rx; /* used by cpumap */ + u32 flags; /* supported values defined in xdp_buff_flags */ }; +static __always_inline bool xdp_frame_is_mb(struct xdp_frame *frame) +{ + return !!(frame->flags & XDP_FLAGS_MULTI_BUFF); +} + #define XDP_BULK_QUEUE_SIZE 16 struct xdp_frame_bulk { int count; @@ -180,6 +207,7 @@ void xdp_convert_frame_to_buff(struct xdp_frame *frame, struct xdp_buff *xdp) xdp->data_end = frame->data + frame->len; xdp->data_meta = frame->data - frame->metasize; xdp->frame_sz = frame->frame_sz; + xdp->flags = frame->flags; } static inline @@ -206,6 +234,7 @@ int xdp_update_frame_from_buff(struct xdp_buff *xdp, xdp_frame->headroom = headroom - sizeof(*xdp_frame); xdp_frame->metasize = metasize; xdp_frame->frame_sz = xdp->frame_sz; + xdp_frame->flags = xdp->flags; return 0; } -- 2.31.1