From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga09.intel.com (mga09.intel.com [134.134.136.24]) by dpdk.org (Postfix) with ESMTP id E12DDCE7 for ; Mon, 8 Dec 2014 07:22:15 +0100 (CET) Received: from orsmga003.jf.intel.com ([10.7.209.27]) by orsmga102.jf.intel.com with ESMTP; 07 Dec 2014 22:20:58 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.04,691,1406617200"; d="scan'208";a="495267708" Received: from shvmail01.sh.intel.com ([10.239.29.42]) by orsmga003.jf.intel.com with ESMTP; 07 Dec 2014 22:18:37 -0800 Received: from shecgisg004.sh.intel.com (shecgisg004.sh.intel.com [10.239.29.89]) by shvmail01.sh.intel.com with ESMTP id sB86MCAL019089; Mon, 8 Dec 2014 14:22:12 +0800 Received: from shecgisg004.sh.intel.com (localhost [127.0.0.1]) by shecgisg004.sh.intel.com (8.13.6/8.13.6/SuSE Linux 0.8) with ESMTP id sB86MANs005040; Mon, 8 Dec 2014 14:22:12 +0800 Received: (from couyang@localhost) by shecgisg004.sh.intel.com (8.13.6/8.13.6/Submit) id sB86MA4p005036; Mon, 8 Dec 2014 14:22:10 +0800 From: Ouyang Changchun To: dev@dpdk.org Date: Mon, 8 Dec 2014 14:21:44 +0800 Message-Id: <1418019716-4962-6-git-send-email-changchun.ouyang@intel.com> X-Mailer: git-send-email 1.7.12.2 In-Reply-To: <1418019716-4962-1-git-send-email-changchun.ouyang@intel.com> References: <1418019716-4962-1-git-send-email-changchun.ouyang@intel.com> Subject: [dpdk-dev] [RFC PATCH 05/17] ether: Add soft vlan encap/decap functions 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: Mon, 08 Dec 2014 06:22:16 -0000 It is helpful to allow device drivers that don't support hardware VLAN stripping to emulate this in software. This allows application to be device independent. Avoid discarding shared mbufs. Make a copy in rte_vlan_insert() of any packet to be tagged that has a reference count > 1. Signed-off-by: Changchun Ouyang Signed-off-by: Stephen Hemminger --- lib/librte_ether/rte_ether.h | 76 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 76 insertions(+) diff --git a/lib/librte_ether/rte_ether.h b/lib/librte_ether/rte_ether.h index 187608d..3b6ab4b 100644 --- a/lib/librte_ether/rte_ether.h +++ b/lib/librte_ether/rte_ether.h @@ -49,6 +49,8 @@ extern "C" { #include #include +#include +#include #define ETHER_ADDR_LEN 6 /**< Length of Ethernet address. */ #define ETHER_TYPE_LEN 2 /**< Length of Ethernet type field. */ @@ -332,6 +334,80 @@ struct vxlan_hdr { #define ETHER_VXLAN_HLEN (sizeof(struct udp_hdr) + sizeof(struct vxlan_hdr)) /**< VXLAN tunnel header length. */ +/** + * Extract VLAN tag information into mbuf + * + * Software version of VLAN stripping + * + * @param m + * The packet mbuf. + * @return + * - 0: Success + * - 1: not a vlan packet + */ +static inline int rte_vlan_strip(struct rte_mbuf *m) +{ + struct ether_hdr *eh + = rte_pktmbuf_mtod(m, struct ether_hdr *); + + if (eh->ether_type != ETHER_TYPE_VLAN) + return -1; + + struct vlan_hdr *vh = (struct vlan_hdr *)(eh + 1); + m->ol_flags |= PKT_RX_VLAN_PKT; + m->vlan_tci = rte_be_to_cpu_16(vh->vlan_tci); + + /* Copy ether header over rather than moving whole packet */ + memmove(rte_pktmbuf_adj(m, sizeof(struct vlan_hdr)), + eh, 2 * ETHER_ADDR_LEN); + + return 0; +} + +/** + * Insert VLAN tag into mbuf. + * + * Software version of VLAN unstripping + * + * @param m + * The packet mbuf. + * @return + * - 0: On success + * -EPERM: mbuf is is shared overwriting would be unsafe + * -ENOSPC: not enough headroom in mbuf + */ +static inline int rte_vlan_insert(struct rte_mbuf **m) +{ + struct ether_hdr *oh, *nh; + struct vlan_hdr *vh; + +#ifdef RTE_MBUF_REFCNT + /* Can't insert header if mbuf is shared */ + if (rte_mbuf_refcnt_read(*m) > 1) { + struct rte_mbuf *copy; + + copy = rte_pktmbuf_clone(*m, (*m)->pool); + if (unlikely(copy == NULL)) + return -ENOMEM; + rte_pktmbuf_free(*m); + *m = copy; + } +#endif + oh = rte_pktmbuf_mtod(*m, struct ether_hdr *); + nh = (struct ether_hdr *) + rte_pktmbuf_prepend(*m, sizeof(struct vlan_hdr)); + if (nh == NULL) + return -ENOSPC; + + memmove(nh, oh, 2 * ETHER_ADDR_LEN); + nh->ether_type = ETHER_TYPE_VLAN; + + vh = (struct vlan_hdr *) (nh + 1); + vh->vlan_tci = rte_cpu_to_be_16((*m)->vlan_tci); + + return 0; +} + #ifdef __cplusplus } #endif -- 1.8.4.2