From patchwork Mon Dec 7 16:32:30 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lorenzo Bianconi X-Patchwork-Id: 339532 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 BD5FEC4167B for ; Mon, 7 Dec 2020 16:33:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8481A238E7 for ; Mon, 7 Dec 2020 16:33:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726938AbgLGQdk (ORCPT ); Mon, 7 Dec 2020 11:33:40 -0500 Received: from mail.kernel.org ([198.145.29.99]:60604 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726249AbgLGQdj (ORCPT ); Mon, 7 Dec 2020 11:33:39 -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, shayagr@amazon.com, sameehj@amazon.com, john.fastabend@gmail.com, dsahern@kernel.org, brouer@redhat.com, echaudro@redhat.com, lorenzo.bianconi@redhat.com, jasowang@redhat.com Subject: [PATCH v5 bpf-next 01/14] xdp: introduce mb in xdp_buff/xdp_frame Date: Mon, 7 Dec 2020 17:32:30 +0100 Message-Id: <7e7dbe0c739640b053c930d3cd22ab7588d6aa3c.1607349924.git.lorenzo@kernel.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@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 is been properly initialized to link together subsequent buffers. Signed-off-by: Lorenzo Bianconi --- include/net/xdp.h | 8 ++++++-- net/core/xdp.c | 1 + 2 files changed, 7 insertions(+), 2 deletions(-) diff --git a/include/net/xdp.h b/include/net/xdp.h index 700ad5db7f5d..70559720ff44 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 */ }; /* Reserve memory area at end-of data area. @@ -97,7 +98,8 @@ 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. */ @@ -154,6 +156,7 @@ 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 @@ -180,6 +183,7 @@ 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; } diff --git a/net/core/xdp.c b/net/core/xdp.c index 17ffd33c6b18..79dd45234e4d 100644 --- a/net/core/xdp.c +++ b/net/core/xdp.c @@ -509,6 +509,7 @@ struct xdp_frame *xdp_convert_zc_to_xdp_frame(struct xdp_buff *xdp) xdpf->headroom = 0; xdpf->metasize = metasize; xdpf->frame_sz = PAGE_SIZE; + xdpf->mb = xdp->mb; xdpf->mem.type = MEM_TYPE_PAGE_ORDER0; xsk_buff_free(xdp);