From patchwork Wed Jul 11 18:23:33 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Lam, Tiago" X-Patchwork-Id: 942623 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=openvswitch.org (client-ip=140.211.169.12; helo=mail.linuxfoundation.org; envelope-from=ovs-dev-bounces@openvswitch.org; receiver=) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=intel.com Received: from mail.linuxfoundation.org (mail.linuxfoundation.org [140.211.169.12]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 41QnbF6ZB6z9s0n for ; Thu, 12 Jul 2018 04:26:49 +1000 (AEST) Received: from mail.linux-foundation.org (localhost [127.0.0.1]) by mail.linuxfoundation.org (Postfix) with ESMTP id 18506EE7; Wed, 11 Jul 2018 18:23:59 +0000 (UTC) X-Original-To: ovs-dev@openvswitch.org Delivered-To: ovs-dev@mail.linuxfoundation.org Received: from smtp1.linuxfoundation.org (smtp1.linux-foundation.org [172.17.192.35]) by mail.linuxfoundation.org (Postfix) with ESMTPS id 2A0DDEE4 for ; Wed, 11 Jul 2018 18:23:57 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.7.6 Received: from mga05.intel.com (mga05.intel.com [192.55.52.43]) by smtp1.linuxfoundation.org (Postfix) with ESMTPS id 88E456B7 for ; Wed, 11 Jul 2018 18:23:56 +0000 (UTC) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga105.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 11 Jul 2018 11:23:56 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.51,338,1526367600"; d="scan'208";a="71504434" Received: from silpixa00399125.ir.intel.com ([10.237.223.34]) by fmsmga001.fm.intel.com with ESMTP; 11 Jul 2018 11:23:55 -0700 From: Tiago Lam To: ovs-dev@openvswitch.org Date: Wed, 11 Jul 2018 19:23:33 +0100 Message-Id: <1531333421-235225-7-git-send-email-tiago.lam@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1531333421-235225-1-git-send-email-tiago.lam@intel.com> References: <1531333421-235225-1-git-send-email-tiago.lam@intel.com> X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on smtp1.linux-foundation.org Cc: i.maximets@samsung.com Subject: [ovs-dev] [PATCH v5 06/14] dp-packet: Handle multi-seg mbufs in helper funcs. X-BeenThere: ovs-dev@openvswitch.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: ovs-dev-bounces@openvswitch.org Errors-To: ovs-dev-bounces@openvswitch.org Most helper functions in dp-packet assume that the data held by a dp_packet is contiguous, and perform operations such as pointer arithmetic under that assumption. However, with the introduction of multi-segment mbufs, where data is non-contiguous, such assumptions are no longer possible. Some examples of Such helper functions are dp_packet_tail(), dp_packet_tailroom(), dp_packet_end(), dp_packet_get_allocated() and dp_packet_at(). Thus, instead of assuming contiguous data in dp_packet, they now iterate over the (non-contiguous) data in mbufs to perform their calculations. Finally, dp_packet_use__() has also been modified to perform the initialisation of the packet (and setting the source) before continuing to set its size and data length, which now depends on the type of packet. Co-authored-by: Mark Kavanagh Signed-off-by: Mark Kavanagh Signed-off-by: Tiago Lam Acked-by: Eelco Chaudron --- lib/dp-packet.c | 4 +- lib/dp-packet.h | 114 +++++++++++++++++++++++++++++++++++++++++++++++++++++--- 2 files changed, 111 insertions(+), 7 deletions(-) diff --git a/lib/dp-packet.c b/lib/dp-packet.c index 782e7c2..2aaeaae 100644 --- a/lib/dp-packet.c +++ b/lib/dp-packet.c @@ -41,11 +41,11 @@ static void dp_packet_use__(struct dp_packet *b, void *base, size_t allocated, enum dp_packet_source source) { + dp_packet_init__(b, allocated, source); + dp_packet_set_base(b, base); dp_packet_set_data(b, base); dp_packet_set_size(b, 0); - - dp_packet_init__(b, allocated, source); } /* Initializes 'b' as an empty dp_packet that contains the 'allocated' bytes of diff --git a/lib/dp-packet.h b/lib/dp-packet.h index d2803af..14e2551 100644 --- a/lib/dp-packet.h +++ b/lib/dp-packet.h @@ -185,9 +185,25 @@ dp_packet_delete(struct dp_packet *b) static inline void * dp_packet_at(const struct dp_packet *b, size_t offset, size_t size) { - return offset + size <= dp_packet_size(b) - ? (char *) dp_packet_data(b) + offset - : NULL; + if (offset + size > dp_packet_size(b)) { + return NULL; + } + +#ifdef DPDK_NETDEV + if (b->source == DPBUF_DPDK) { + struct rte_mbuf *buf = CONST_CAST(struct rte_mbuf *, &b->mbuf); + + while (buf && offset > buf->data_len) { + offset -= buf->data_len; + + buf = buf->next; + } + + return buf ? rte_pktmbuf_mtod_offset(buf, char *, offset) : NULL; + } +#endif + + return (char *) dp_packet_data(b) + offset; } /* Returns a pointer to byte 'offset' in 'b', which must contain at least @@ -196,13 +212,23 @@ static inline void * dp_packet_at_assert(const struct dp_packet *b, size_t offset, size_t size) { ovs_assert(offset + size <= dp_packet_size(b)); - return ((char *) dp_packet_data(b)) + offset; + return dp_packet_at(b, offset, size); } /* Returns a pointer to byte following the last byte of data in use in 'b'. */ static inline void * dp_packet_tail(const struct dp_packet *b) { +#ifdef DPDK_NETDEV + if (b->source == DPBUF_DPDK) { + struct rte_mbuf *buf = CONST_CAST(struct rte_mbuf *, &b->mbuf); + /* Find last segment where data ends, meaning the tail of the chained + * mbufs must be there */ + buf = rte_pktmbuf_lastseg(buf); + + return rte_pktmbuf_mtod_offset(buf, void *, buf->data_len); + } +#endif return (char *) dp_packet_data(b) + dp_packet_size(b); } @@ -211,6 +237,15 @@ dp_packet_tail(const struct dp_packet *b) static inline void * dp_packet_end(const struct dp_packet *b) { +#ifdef DPDK_NETDEV + if (b->source == DPBUF_DPDK) { + struct rte_mbuf *buf = CONST_CAST(struct rte_mbuf *, &(b->mbuf)); + + buf = rte_pktmbuf_lastseg(buf); + + return (char *) buf->buf_addr + buf->buf_len; + } +#endif return (char *) dp_packet_base(b) + dp_packet_get_allocated(b); } @@ -236,6 +271,15 @@ dp_packet_tailroom(const struct dp_packet *b) static inline void dp_packet_clear(struct dp_packet *b) { +#ifdef DPDK_NETDEV + if (b->source == DPBUF_DPDK) { + /* sets pkt_len and data_len to zero and frees unused mbufs */ + dp_packet_set_size(b, 0); + rte_pktmbuf_reset(&b->mbuf); + + return; + } +#endif dp_packet_set_data(b, dp_packet_base(b)); dp_packet_set_size(b, 0); } @@ -252,12 +296,33 @@ dp_packet_pull(struct dp_packet *b, size_t size) return data; } +#ifdef DPDK_NETDEV +/* Similar to dp_packet_try_pull() but doesn't actually pull any data, only + * checks if it could and returns true or false accordingly. + * + * Valid for dp_packets carrying mbufs only. */ +static inline bool +dp_packet_mbuf_may_pull(const struct dp_packet *b, size_t size) { + if (size > b->mbuf.data_len) { + return false; + } + + return true; +} +#endif + /* If 'b' has at least 'size' bytes of data, removes that many bytes from the * head end of 'b' and returns the first byte removed. Otherwise, returns a * null pointer without modifying 'b'. */ static inline void * dp_packet_try_pull(struct dp_packet *b, size_t size) { +#ifdef DPDK_NETDEV + if (!dp_packet_mbuf_may_pull(b, size)) { + return NULL; + } +#endif + return dp_packet_size(b) - dp_packet_l2_pad_size(b) >= size ? dp_packet_pull(b, size) : NULL; } @@ -311,6 +376,12 @@ dp_packet_set_l2_pad_size(struct dp_packet *b, uint8_t pad_size) static inline void * dp_packet_l2_5(const struct dp_packet *b) { +#ifdef DPDK_NETDEV + if (!dp_packet_mbuf_may_pull(b, b->l2_5_ofs)) { + return NULL; + } +#endif + return b->l2_5_ofs != UINT16_MAX ? (char *) dp_packet_data(b) + b->l2_5_ofs : NULL; @@ -327,6 +398,12 @@ dp_packet_set_l2_5(struct dp_packet *b, void *l2_5) static inline void * dp_packet_l3(const struct dp_packet *b) { +#ifdef DPDK_NETDEV + if (!dp_packet_mbuf_may_pull(b, b->l3_ofs)) { + return NULL; + } +#endif + return b->l3_ofs != UINT16_MAX ? (char *) dp_packet_data(b) + b->l3_ofs : NULL; @@ -341,6 +418,12 @@ dp_packet_set_l3(struct dp_packet *b, void *l3) static inline void * dp_packet_l4(const struct dp_packet *b) { +#ifdef DPDK_NETDEV + if (!dp_packet_mbuf_may_pull(b, b->l4_ofs)) { + return NULL; + } +#endif + return b->l4_ofs != UINT16_MAX ? (char *) dp_packet_data(b) + b->l4_ofs : NULL; @@ -355,6 +438,27 @@ dp_packet_set_l4(struct dp_packet *b, void *l4) static inline size_t dp_packet_l4_size(const struct dp_packet *b) { +#ifdef DPDK_NETDEV + if (b->source == DPBUF_DPDK) { + if (!dp_packet_mbuf_may_pull(b, b->l4_ofs)) { + return 0; + } + + struct rte_mbuf *mbuf = CONST_CAST(struct rte_mbuf *, &b->mbuf); + size_t l4_size = mbuf->data_len - b->l4_ofs; + + mbuf = mbuf->next; + while (mbuf) { + l4_size += mbuf->data_len; + + mbuf = mbuf->next; + } + + l4_size -= dp_packet_l2_pad_size(b); + + return l4_size; + } +#endif return b->l4_ofs != UINT16_MAX ? (const char *)dp_packet_tail(b) - (const char *)dp_packet_l4(b) - dp_packet_l2_pad_size(b) @@ -509,7 +613,7 @@ __packet_set_data(struct dp_packet *b, uint16_t v) static inline uint16_t dp_packet_get_allocated(const struct dp_packet *b) { - return b->mbuf.buf_len; + return b->mbuf.nb_segs * b->mbuf.buf_len; } static inline void