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=-19.2 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 7B45CC433DB for ; Tue, 19 Jan 2021 20:39:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3254D23108 for ; Tue, 19 Jan 2021 20:39:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730759AbhASUio (ORCPT ); Tue, 19 Jan 2021 15:38:44 -0500 Received: from mail.kernel.org ([198.145.29.99]:55858 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729133AbhASUVO (ORCPT ); Tue, 19 Jan 2021 15:21:14 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 6A16C2310B; Tue, 19 Jan 2021 20:20:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1611087633; bh=zRvnC+rMpVuGdnEf78Q53RzlvyZSgmNFdlCLTFG2m8c=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qdOM4oU8k+LMMJRotRJ4X+pHTmLhkfTL2iHyvV5JI8/Hp2i2G+GgBciWY4ae4XKog cbYCVZbX7H4oZXD5/niOFF8beLgbCyMtOhvicTQ8MNi7BGpOylGi5sGzqiajKWZfLW UuSAlQRpG7kU84j2hRdI83WXjbECUn8XjKd4JyluRuFA9I0kbvhxO+FTaQG68Gmtb5 PwAtcYVssNHtwb3eJB8pbEiV+ToXFvUX96i2OkzcZjJ0SBB+f9wXOySFHnzW8D5VU2 2A+66gVYn5eYwI5my0NoOfEle9Xp2dpgXSkW9EvLZ/z41N9p3AME0WB5UGdcWg9ZLm GhkLlC5WYs//A== 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, sameehj@amazon.com Subject: [PATCH v6 bpf-next 1/8] xdp: introduce mb in xdp_buff/xdp_frame Date: Tue, 19 Jan 2021 21:20:07 +0100 Message-Id: <6e92b9194558d7251bba5405b3138daaa8a1a950.1611086134.git.lorenzo@kernel.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org Introduce multi-buffer bit (mb) in xdp_frame/xdp_buffer data structure in order to specify if this is a linear buffer (mb = 0) or a multi-buffer frame (mb = 1). In the latter case the shared_info area at the end of the first buffer will be properly initialized to link together subsequent buffers. Signed-off-by: Lorenzo Bianconi --- include/net/xdp.h | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/include/net/xdp.h b/include/net/xdp.h index c4bfdc9a8b79..945767813fdd 100644 --- a/include/net/xdp.h +++ b/include/net/xdp.h @@ -73,7 +73,8 @@ struct xdp_buff { void *data_hard_start; struct xdp_rxq_info *rxq; struct xdp_txq_info *txq; - u32 frame_sz; /* frame size to deduce data_hard_end/reserved tailroom*/ + u32 frame_sz:31; /* frame size to deduce data_hard_end/reserved tailroom*/ + u32 mb:1; /* xdp non-linear buffer */ }; static __always_inline void @@ -81,6 +82,7 @@ xdp_init_buff(struct xdp_buff *xdp, u32 frame_sz, struct xdp_rxq_info *rxq) { xdp->frame_sz = frame_sz; xdp->rxq = rxq; + xdp->mb = 0; } static __always_inline void @@ -116,7 +118,8 @@ struct xdp_frame { u16 len; u16 headroom; u32 metasize:8; - u32 frame_sz:24; + u32 frame_sz:23; + u32 mb:1; /* xdp non-linear frame */ /* Lifetime of xdp_rxq_info is limited to NAPI/enqueue time, * while mem info is valid on remote CPU. */ @@ -178,6 +181,7 @@ 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->mb = frame->mb; } static inline @@ -204,6 +208,7 @@ 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->mb = xdp->mb; return 0; } -- 2.29.2