From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wg0-f45.google.com (mail-wg0-f45.google.com [74.125.82.45]) by dpdk.org (Postfix) with ESMTP id 69C67C3B0 for ; Tue, 21 Apr 2015 11:55:55 +0200 (CEST) Received: by wgsk9 with SMTP id k9so207127595wgs.3 for ; Tue, 21 Apr 2015 02:55:55 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=i9mHzkO5p+/l5gOV12vmQK/6/TOkjr6fFwyoncmSRJ0=; b=Q2jtjMylGOoENxW/ImdbXC18YTCoElwJt2pUgsoQkgFKMeAH1rWGKoseadzlA6D5jw g8LuTfLiyctCakRcP/mqmrN430KPVo2w7HuUB57ZjuqcKbpfaBMUNNAE/44aQRpqnZ/d Xyl4deozqzt2Oz6PZmy3vRXJtXfzg0UivXevO3faa9uqFag8ssBGPMwh5oKuuPPuLdxT 7opoudmMTHLKmTczfRa9guv+9bGToxWe7eDVTvMN3x3ujxusb4AuBgnSc42/fTbEu6BJ cLSh624JUA9iUtWU/ywHbxlt6OKEwL08Wl9HF0I6end5J7NHcUPj/hIch1ZMDDg7vOf8 ILDQ== X-Gm-Message-State: ALoCoQnP/PXS9M07GKPgJGkmFC6sAee6s/V/xylsZXGtDGUVXsw7n048+fl6PH+LG6ZhuFSqdIqw X-Received: by 10.180.215.101 with SMTP id oh5mr4381240wic.6.1429610155314; Tue, 21 Apr 2015 02:55:55 -0700 (PDT) Received: from glumotte.dev.6wind.com (6wind.net2.nerim.net. [213.41.180.237]) by mx.google.com with ESMTPSA id i6sm1855867wjf.29.2015.04.21.02.55.54 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Tue, 21 Apr 2015 02:55:54 -0700 (PDT) From: Olivier Matz To: dev@dpdk.org Date: Tue, 21 Apr 2015 11:55:19 +0200 Message-Id: <1429610122-30943-10-git-send-email-olivier.matz@6wind.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1429610122-30943-1-git-send-email-olivier.matz@6wind.com> References: <1429544496-22532-1-git-send-email-olivier.matz@6wind.com> <1429610122-30943-1-git-send-email-olivier.matz@6wind.com> Subject: [dpdk-dev] [PATCH v5 09/12] mbuf: allow to clone an indirect mbuf X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: patches and discussions about DPDK List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 21 Apr 2015 09:55:55 -0000 Remove one limitation of rte_pktmbuf_attach(): "mbuf we're attaching to must be direct". Now, when we attach to an indirect mbuf: - copy the all relevant fields (addr, len, offload, ...) as before - get the pointer to the mbuf that embeds the data buffer (direct mbuf), and increase the reference counter of this one. When detaching the mbuf, we can retrieve this direct mbuf as the pointer is determined from the buffer address. Signed-off-by: Olivier Matz --- lib/librte_mbuf/rte_mbuf.h | 46 ++++++++++++++++++++++++++-------------------- 1 file changed, 26 insertions(+), 20 deletions(-) diff --git a/lib/librte_mbuf/rte_mbuf.h b/lib/librte_mbuf/rte_mbuf.h index 5c01c5b..df54a46 100644 --- a/lib/librte_mbuf/rte_mbuf.h +++ b/lib/librte_mbuf/rte_mbuf.h @@ -799,43 +799,49 @@ static inline struct rte_mbuf *rte_pktmbuf_alloc(struct rte_mempool *mp) * After attachment we refer the mbuf we attached as 'indirect', * while mbuf we attached to as 'direct'. * Right now, not supported: - * - attachment to indirect mbuf (e.g. - md has to be direct). * - attachment for already indirect mbuf (e.g. - mi has to be direct). * - mbuf we trying to attach (mi) is used by someone else * e.g. it's reference counter is greater then 1. * * @param mi * The indirect packet mbuf. - * @param md - * The direct packet mbuf. + * @param m + * The packet mbuf we're attaching to. */ -static inline void rte_pktmbuf_attach(struct rte_mbuf *mi, struct rte_mbuf *md) +static inline void rte_pktmbuf_attach(struct rte_mbuf *mi, struct rte_mbuf *m) { - RTE_MBUF_ASSERT(RTE_MBUF_DIRECT(md) && - RTE_MBUF_DIRECT(mi) && + struct rte_mbuf *md; + + RTE_MBUF_ASSERT(RTE_MBUF_DIRECT(mi) && rte_mbuf_refcnt_read(mi) == 1); + /* if m is not direct, get the mbuf that embeds the data */ + if (RTE_MBUF_DIRECT(m)) + md = m; + else + md = rte_mbuf_from_indirect(m); + rte_mbuf_refcnt_update(md, 1); - mi->buf_physaddr = md->buf_physaddr; - mi->buf_addr = md->buf_addr; - mi->buf_len = md->buf_len; - - mi->next = md->next; - mi->data_off = md->data_off; - mi->data_len = md->data_len; - mi->port = md->port; - mi->vlan_tci = md->vlan_tci; - mi->tx_offload = md->tx_offload; - mi->hash = md->hash; + mi->buf_physaddr = m->buf_physaddr; + mi->buf_addr = m->buf_addr; + mi->buf_len = m->buf_len; + + mi->next = m->next; + mi->data_off = m->data_off; + mi->data_len = m->data_len; + mi->port = m->port; + mi->vlan_tci = m->vlan_tci; + mi->tx_offload = m->tx_offload; + mi->hash = m->hash; mi->next = NULL; mi->pkt_len = mi->data_len; mi->nb_segs = 1; - mi->ol_flags = md->ol_flags | IND_ATTACHED_MBUF; - mi->packet_type = md->packet_type; + mi->ol_flags = m->ol_flags | IND_ATTACHED_MBUF; + mi->packet_type = m->packet_type; __rte_mbuf_sanity_check(mi, 1); - __rte_mbuf_sanity_check(md, 0); + __rte_mbuf_sanity_check(m, 0); } /** -- 2.1.4