From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga05.intel.com (mga05.intel.com [192.55.52.43]) by dpdk.org (Postfix) with ESMTP id 61AC3374 for ; Tue, 20 Jun 2017 05:21:12 +0200 (CEST) Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by fmsmga105.fm.intel.com with ESMTP; 19 Jun 2017 20:21:11 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.39,363,1493708400"; d="scan'208";a="116938240" Received: from unknown (HELO localhost.localdomain) ([10.239.128.239]) by fmsmga006.fm.intel.com with ESMTP; 19 Jun 2017 20:21:10 -0700 Date: Tue, 20 Jun 2017 11:22:20 +0800 From: Jiayu Hu To: "Tan, Jianfeng" Cc: dev@dpdk.org, konstantin.ananyev@intel.com, yliu@fridaylinux.org, keith.wiles@intel.com, tiwei.bie@intel.com, lei.a.yao@intel.com Message-ID: <20170620032220.GB12728@localhost.localdomain> References: <1496833731-53653-1-git-send-email-jiayu.hu@intel.com> <1497770469-16661-1-git-send-email-jiayu.hu@intel.com> <1497770469-16661-3-git-send-email-jiayu.hu@intel.com> <20fd3a2c-9b61-2732-5a34-5acb8fc639a0@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20fd3a2c-9b61-2732-5a34-5acb8fc639a0@intel.com> User-Agent: Mutt/1.7.1 (2016-10-04) Subject: Re: [dpdk-dev] [PATCH v5 2/3] lib/gro: add TCP/IPv4 GRO support X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 20 Jun 2017 03:21:13 -0000 Hi Jianfeng, On Mon, Jun 19, 2017 at 11:43:20PM +0800, Tan, Jianfeng wrote: > > > On 6/18/2017 3:21 PM, Jiayu Hu wrote: > > In this patch, we introduce six APIs to support TCP/IPv4 GRO. > > Those functions are not used outside of this library. Don't make it as > extern visible. But they are called by functions in rte_gro.c, which are in the different file. If we define these functions with static, how can they be called by other functions in the different file? > > > - gro_tcp_tbl_create: create a TCP reassembly table, which is used to > > merge packets. > > Will tcp6 shares the same function with tcp4? If no, please rename it to > gro_tcp4_tlb_create In TCP GRO design, TCP4 and TCP6 will share a same table structure, but they will have different reassembly function. Therefore, I use gro_tcp_tlb_create instead of gro_tcp4_tlb_create here. > > > - gro_tcp_tbl_destroy: free memory space of a TCP reassembly table. > > - gro_tcp_tbl_flush: flush packets in the TCP reassembly table. > > - gro_tcp_tbl_timeout_flush: flush timeout packets in the TCP > > reassembly table. > > - gro_tcp4_reassemble: merge an inputted packet. > > - gro_tcp4_tbl_cksum_update: update TCP and IPv4 header checksums for > > all merged packets in the TCP reassembly table. > > > > In TCP GRO, we use a table structure, called TCP reassembly table, to > > reassemble packets. Both TCP/IPv4 and TCP/IPv6 GRO use the same table > > structure. A TCP reassembly table includes a flow array and a item array, > > where the flow array is used to record flow information and the item > > array is used to record packets information. > > > > Each element in the flow array records the information of one flow, > > which includes two parts: > > - key: the criteria of the same flow. If packets have the same key > > value, they belong to the same flow. > > - start_index: the index of the first incoming packet of this flow in > > the item array. With start_index, we can locate the first incoming > > packet of this flow. > > Each element in the item array records one packet information. It mainly > > includes two parts: > > - pkt: packet address > > - next_pkt_index: index of the next packet of the same flow in the item > > array. All packets of the same flow are chained by next_pkt_index. > > With next_pkt_index, we can locate all packets of the same flow > > one by one. > > > > To process an incoming packet, we need three steps: > > a. check if the packet should be processed. Packets with the following > > properties won't be processed: > > - packets without data; > > - packets with wrong checksums; > > Why do we care to check this kind of error? Can we just suppose the > applications have already dropped the packets with wrong cksum? Indeed, if we assume all inputted packets are correct, we can avoid checksum checking overhead. But as a library, I think a more flexible way is to enable applications to tell GRO API if checksum checking is needed. For example, we can add a flag to struct rte_gro_tbl and struct rte_gro_param, which indicates if the checksum checking is needed. If applications set this flag, reassembly function won't check packet checksum. Otherwise, we check the checksum. How do you think? > > > - fragmented packets. > > IP fragmented? I don't think we need to check it here either. It's the > application's responsibility to call librte_ip_frag firstly to reassemble > IP-fragmented packets, and then call this gro library to merge TCP packets. > And this procedure should be shown in an example for other users to refer. > > > b. traverse the flow array to find a flow which the packet belongs to. > > If not find, insert a new flow and store the packet into the item > > array. > > You do not store the packet now. "store the packet into the item array" -> > "then go to step c". Thanks, I will update it in next patch. > > > c. locate the first packet of this flow in the item array via > > start_index. Then traverse all packets of this flow one by one via > > next_pkt_index. If find one packet to merge with the incoming packet, > > merge them but without updating checksums. If not, allocate one item > > in the item array to store the incoming packet and update > > next_pkt_index value. > > > > For better performance, we don't update header checksums once two > > packets are merged. The header checksums are updated only when packets > > are flushed from TCP reassembly tables. > > Why do we care to recalculate the L4 checksum when flushing? How about Just > keeping the wrong cksum, and letting the applications to handle that? Not all applications want GROed packets with wrong checksum. So I think a more reasonable way is to give a flag to applications to tell GRO API if they need calculate checksum when flush them from GRO table. How do you think? > > > > > > Signed-off-by: Jiayu Hu > > --- > > lib/librte_gro/Makefile | 1 + > > lib/librte_gro/rte_gro.c | 154 +++++++++++-- > > lib/librte_gro/rte_gro.h | 34 +-- > > lib/librte_gro/rte_gro_tcp.c | 527 +++++++++++++++++++++++++++++++++++++++++++ > > lib/librte_gro/rte_gro_tcp.h | 210 +++++++++++++++++ > > 5 files changed, 895 insertions(+), 31 deletions(-) > > create mode 100644 lib/librte_gro/rte_gro_tcp.c > > create mode 100644 lib/librte_gro/rte_gro_tcp.h > > > > diff --git a/lib/librte_gro/Makefile b/lib/librte_gro/Makefile > > index 9f4063a..3495dfc 100644 > > --- a/lib/librte_gro/Makefile > > +++ b/lib/librte_gro/Makefile > > @@ -43,6 +43,7 @@ LIBABIVER := 1 > > # source files > > SRCS-$(CONFIG_RTE_LIBRTE_GRO) += rte_gro.c > > +SRCS-$(CONFIG_RTE_LIBRTE_GRO) += rte_gro_tcp.c > > Again, if it's just for tcp4, please use the name rte_gro_tcp4.c. TCP4 and TCP6 reassembly functions will be placed in the same file, rte_gro_tcp.c. But currently, we don't support TCP6 GRO. > > > # install this header file > > SYMLINK-$(CONFIG_RTE_LIBRTE_GRO)-include += rte_gro.h > > diff --git a/lib/librte_gro/rte_gro.c b/lib/librte_gro/rte_gro.c > > index 1bc53a2..2620ef6 100644 > > --- a/lib/librte_gro/rte_gro.c > > +++ b/lib/librte_gro/rte_gro.c > > @@ -32,11 +32,17 @@ > > #include > > #include > > +#include > > +#include > > +#include > > #include "rte_gro.h" > > +#include "rte_gro_tcp.h" > > -static gro_tbl_create_fn tbl_create_functions[GRO_TYPE_MAX_NB]; > > -static gro_tbl_destroy_fn tbl_destroy_functions[GRO_TYPE_MAX_NB]; > > +static gro_tbl_create_fn tbl_create_functions[GRO_TYPE_MAX_NB] = { > > + gro_tcp_tbl_create, NULL}; > > +static gro_tbl_destroy_fn tbl_destroy_functions[GRO_TYPE_MAX_NB] = { > > + gro_tcp_tbl_destroy, NULL}; > > struct rte_gro_tbl *rte_gro_tbl_create(uint16_t socket_id, > > uint16_t max_flow_num, > > @@ -94,33 +100,149 @@ void rte_gro_tbl_destroy(struct rte_gro_tbl *gro_tbl) > > } > > uint16_t > > -rte_gro_reassemble_burst(struct rte_mbuf **pkts __rte_unused, > > +rte_gro_reassemble_burst(struct rte_mbuf **pkts, > > const uint16_t nb_pkts, > > - const struct rte_gro_param param __rte_unused) > > + const struct rte_gro_param param) > > { > > - return nb_pkts; > > + struct ether_hdr *eth_hdr; > > + struct ipv4_hdr *ipv4_hdr; > > + uint16_t l3proc_type, i; > > I did not catch the variable definition here: l3proc_type -> l3_proto? You can see it in line 158 and line 159. > > > + uint16_t nb_after_gro = nb_pkts; > > + uint16_t flow_num = nb_pkts < param.max_flow_num ? > > + nb_pkts : param.max_flow_num; > > + uint32_t item_num = nb_pkts < > > + flow_num * param.max_item_per_flow ? > > + nb_pkts : > > + flow_num * param.max_item_per_flow; > > + > > + /* allocate a reassembly table for TCP/IPv4 GRO */ > > + uint16_t tcp_flow_num = flow_num <= GRO_TCP_TBL_MAX_FLOW_NUM ? > > + flow_num : GRO_TCP_TBL_MAX_FLOW_NUM; > > + uint32_t tcp_item_num = item_num <= GRO_TCP_TBL_MAX_ITEM_NUM ? > > + item_num : GRO_TCP_TBL_MAX_ITEM_NUM; > > Below tcpv4-specific logic should be in rte_gro_tcp4.c; here, as my previous > comment, we iterate all ptypes of this packets to iterate all supported GRO > engine. Sorry, I don't get the point. The table which is created here is used by gro_tcp4_reassemble when merges packets. If we don't create table here, what does gro_tcp4_reassemble use to merge packets? > > > + struct gro_tcp_tbl tcp_tbl; > > + struct gro_tcp_flow tcp_flows[tcp_flow_num]; > > + struct gro_tcp_item tcp_items[tcp_item_num]; > > + struct gro_tcp_rule tcp_rule; > > + > > + struct rte_mbuf *unprocess_pkts[nb_pkts]; > > + uint16_t unprocess_num = 0; > > + int32_t ret; > > + > > + if (unlikely(nb_pkts <= 1)) > > + return nb_pkts; > > + > > + memset(tcp_flows, 0, sizeof(struct gro_tcp_flow) * > > + tcp_flow_num); > > + memset(tcp_items, 0, sizeof(struct gro_tcp_item) * > > + tcp_item_num); > > + tcp_tbl.flows = tcp_flows; > > + tcp_tbl.items = tcp_items; > > + tcp_tbl.flow_num = 0; > > + tcp_tbl.item_num = 0; > > + tcp_tbl.max_flow_num = tcp_flow_num; > > + tcp_tbl.max_item_num = tcp_item_num; > > + tcp_rule.max_packet_size = param.max_packet_size; > > + > > + for (i = 0; i < nb_pkts; i++) { > > + eth_hdr = rte_pktmbuf_mtod(pkts[i], struct ether_hdr *); > > + l3proc_type = rte_be_to_cpu_16(eth_hdr->ether_type); > > + if (l3proc_type == ETHER_TYPE_IPv4) { > > + ipv4_hdr = (struct ipv4_hdr *)(eth_hdr + 1); > > + if (ipv4_hdr->next_proto_id == IPPROTO_TCP && > > + (param.desired_gro_types & > > + GRO_TCP_IPV4)) { > > + ret = gro_tcp4_reassemble(pkts[i], > > + &tcp_tbl, > > + &tcp_rule); > > + if (ret > 0) > > + nb_after_gro--; > > + else if (ret < 0) > > + unprocess_pkts[unprocess_num++] = > > + pkts[i]; > > + } else > > + unprocess_pkts[unprocess_num++] = > > + pkts[i]; > > + } else > > + unprocess_pkts[unprocess_num++] = > > + pkts[i]; > > + } > > + > > + if (nb_after_gro < nb_pkts) { > > + /* update packets headers and re-arrange GROed packets */ > > + if (param.desired_gro_types & GRO_TCP_IPV4) { > > + gro_tcp4_tbl_cksum_update(&tcp_tbl); > > + for (i = 0; i < tcp_tbl.item_num; i++) > > + pkts[i] = tcp_tbl.items[i].pkt; > > + } > > + if (unprocess_num > 0) { > > + memcpy(&pkts[i], unprocess_pkts, > > + sizeof(struct rte_mbuf *) * > > + unprocess_num); > > + i += unprocess_num; > > + } > > + if (nb_pkts > i) > > + memset(&pkts[i], 0, > > + sizeof(struct rte_mbuf *) * > > + (nb_pkts - i)); > > + } > > + return nb_after_gro; > > } > > -int rte_gro_reassemble(struct rte_mbuf *pkt __rte_unused, > > - struct rte_gro_tbl *gro_tbl __rte_unused) > > +int rte_gro_reassemble(struct rte_mbuf *pkt, > > + struct rte_gro_tbl *gro_tbl) > > { > > + struct ether_hdr *eth_hdr; > > + struct ipv4_hdr *ipv4_hdr; > > + uint16_t l3proc_type; > > + struct gro_tcp_rule tcp_rule; > > + > > + if (pkt == NULL) > > + return -1; > > + tcp_rule.max_packet_size = gro_tbl->max_packet_size; > > + eth_hdr = rte_pktmbuf_mtod(pkt, struct ether_hdr *); > > + l3proc_type = rte_be_to_cpu_16(eth_hdr->ether_type); > > + if (l3proc_type == ETHER_TYPE_IPv4) { > > + ipv4_hdr = (struct ipv4_hdr *)(eth_hdr + 1); > > + if (ipv4_hdr->next_proto_id == IPPROTO_TCP && > > + (gro_tbl->desired_gro_types & GRO_TCP_IPV4)) { > > + return gro_tcp4_reassemble(pkt, > > + gro_tbl->tbls[GRO_TCP_IPV4_INDEX], > > + &tcp_rule); > > + } > > + } > > return -1; > > } > > -uint16_t rte_gro_flush(struct rte_gro_tbl *gro_tbl __rte_unused, > > - uint64_t desired_gro_types __rte_unused, > > - uint16_t flush_num __rte_unused, > > - struct rte_mbuf **out __rte_unused, > > - const uint16_t max_nb_out __rte_unused) > > +uint16_t rte_gro_flush(struct rte_gro_tbl *gro_tbl, > > + uint64_t desired_gro_types, > > + uint16_t flush_num, > > + struct rte_mbuf **out, > > + const uint16_t max_nb_out) > > { > > Ditto. > > > + desired_gro_types = desired_gro_types & > > + gro_tbl->desired_gro_types; > > + if (desired_gro_types & GRO_TCP_IPV4) > > + return gro_tcp_tbl_flush( > > + gro_tbl->tbls[GRO_TCP_IPV4_INDEX], > > + flush_num, > > + out, > > + max_nb_out); > > return 0; > > } > > uint16_t > > -rte_gro_timeout_flush(struct rte_gro_tbl *gro_tbl __rte_unused, > > - uint64_t desired_gro_types __rte_unused, > > - struct rte_mbuf **out __rte_unused, > > - const uint16_t max_nb_out __rte_unused) > > +rte_gro_timeout_flush(struct rte_gro_tbl *gro_tbl, > > + uint64_t desired_gro_types, > > + struct rte_mbuf **out, > > + const uint16_t max_nb_out) > > { > > + desired_gro_types = desired_gro_types & > > + gro_tbl->desired_gro_types; > > + if (desired_gro_types & GRO_TCP_IPV4) > > + return gro_tcp_tbl_timeout_flush( > > + gro_tbl->tbls[GRO_TCP_IPV4_INDEX], > > + gro_tbl->max_timeout_cycles, > > + out, max_nb_out); > > return 0; > > } > > diff --git a/lib/librte_gro/rte_gro.h b/lib/librte_gro/rte_gro.h > > index 67bd90d..e26aa5b 100644 > > --- a/lib/librte_gro/rte_gro.h > > +++ b/lib/librte_gro/rte_gro.h > > @@ -35,7 +35,11 @@ > > /* maximum number of supported GRO types */ > > #define GRO_TYPE_MAX_NB 64 > > -#define GRO_TYPE_SUPPORT_NB 0 /**< current supported GRO num */ > > +#define GRO_TYPE_SUPPORT_NB 1 /**< supported GRO types number */ > > + > > +/* TCP/IPv4 GRO flag */ > > +#define GRO_TCP_IPV4_INDEX 0 > > +#define GRO_TCP_IPV4 (1ULL << GRO_TCP_IPV4_INDEX) > > /** > > * GRO table structure. DPDK GRO uses GRO table to reassemble > > @@ -139,9 +143,9 @@ void rte_gro_tbl_destroy(struct rte_gro_tbl *gro_tbl); > > * @return > > * the number of packets after GROed. > > */ > > -uint16_t rte_gro_reassemble_burst(struct rte_mbuf **pkts __rte_unused, > > - const uint16_t nb_pkts __rte_unused, > > - const struct rte_gro_param param __rte_unused); > > +uint16_t rte_gro_reassemble_burst(struct rte_mbuf **pkts, > > + const uint16_t nb_pkts, > > + const struct rte_gro_param param); > > /** > > * This is the main reassembly API used in heavyweight mode, which > > @@ -164,8 +168,8 @@ uint16_t rte_gro_reassemble_burst(struct rte_mbuf **pkts __rte_unused, > > * if merge the packet successfully, return a positive value. If fail > > * to merge, return zero. If errors happen, return a negative value. > > */ > > -int rte_gro_reassemble(struct rte_mbuf *pkt __rte_unused, > > - struct rte_gro_tbl *gro_tbl __rte_unused); > > +int rte_gro_reassemble(struct rte_mbuf *pkt, > > + struct rte_gro_tbl *gro_tbl); > > /** > > * This function flushed packets of desired GRO types from their > > @@ -184,11 +188,11 @@ int rte_gro_reassemble(struct rte_mbuf *pkt __rte_unused, > > * @return > > * the number of flushed packets. If no packets are flushed, return 0. > > */ > > -uint16_t rte_gro_flush(struct rte_gro_tbl *gro_tbl __rte_unused, > > - uint64_t desired_gro_types __rte_unused, > > - uint16_t flush_num __rte_unused, > > - struct rte_mbuf **out __rte_unused, > > - const uint16_t max_nb_out __rte_unused); > > +uint16_t rte_gro_flush(struct rte_gro_tbl *gro_tbl, > > + uint64_t desired_gro_types, > > + uint16_t flush_num, > > + struct rte_mbuf **out, > > + const uint16_t max_nb_out); > > /** > > * This function flushes the timeout packets from reassembly tables of > > @@ -206,8 +210,8 @@ uint16_t rte_gro_flush(struct rte_gro_tbl *gro_tbl __rte_unused, > > * @return > > * the number of flushed packets. If no packets are flushed, return 0. > > */ > > -uint16_t rte_gro_timeout_flush(struct rte_gro_tbl *gro_tbl __rte_unused, > > - uint64_t desired_gro_types __rte_unused, > > - struct rte_mbuf **out __rte_unused, > > - const uint16_t max_nb_out __rte_unused); > > +uint16_t rte_gro_timeout_flush(struct rte_gro_tbl *gro_tbl, > > + uint64_t desired_gro_types, > > + struct rte_mbuf **out, > > + const uint16_t max_nb_out); > > Do you have any cases to test this API? I don't see following example use > this API. That means we are exposing an API that are never tested. I don't > know if we can add some experimental flag on this API. Let's seek advice > from others. These flush APIs are used in heavyweight mode. But testpmd is not a good case to use heavyweight mode. How do you think if we use some unit tests to test them? > > > #endif > > diff --git a/lib/librte_gro/rte_gro_tcp.c b/lib/librte_gro/rte_gro_tcp.c > > new file mode 100644 > > index 0000000..86743cd > > --- /dev/null > > +++ b/lib/librte_gro/rte_gro_tcp.c > > @@ -0,0 +1,527 @@ > > +/*- > > + * BSD LICENSE > > + * > > + * Copyright(c) 2016-2017 Intel Corporation. All rights reserved. > > + * > > + * Redistribution and use in source and binary forms, with or without > > + * modification, are permitted provided that the following conditions > > + * are met: > > + * > > + * * Redistributions of source code must retain the above copyright > > + * notice, this list of conditions and the following disclaimer. > > + * * Redistributions in binary form must reproduce the above copyright > > + * notice, this list of conditions and the following disclaimer in > > + * the documentation and/or other materials provided with the > > + * distribution. > > + * * Neither the name of Intel Corporation nor the names of its > > + * contributors may be used to endorse or promote products derived > > + * from this software without specific prior written permission. > > + * > > + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS > > + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT > > + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR > > + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT > > + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, > > + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT > > + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, > > + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY > > + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT > > + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE > > + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. > > + */ > > + > > +#include > > +#include > > +#include > > + > > +#include > > +#include > > +#include > > + > > +#include "rte_gro_tcp.h" > > + > > +void *gro_tcp_tbl_create(uint16_t socket_id, > > Define it as "static". Similar to other functions. > > > + uint16_t max_flow_num, > > + uint16_t max_item_per_flow) > > +{ > > + size_t size; > > + uint32_t entries_num; > > + struct gro_tcp_tbl *tbl; > > + > > + max_flow_num = max_flow_num > GRO_TCP_TBL_MAX_FLOW_NUM ? > > + GRO_TCP_TBL_MAX_FLOW_NUM : max_flow_num; > > + > > + entries_num = max_flow_num * max_item_per_flow; > > + entries_num = entries_num > GRO_TCP_TBL_MAX_ITEM_NUM ? > > + GRO_TCP_TBL_MAX_ITEM_NUM : entries_num; > > + > > + if (entries_num == 0 || max_flow_num == 0) > > + return NULL; > > + > > + tbl = (struct gro_tcp_tbl *)rte_zmalloc_socket( > > + __func__, > > + sizeof(struct gro_tcp_tbl), > > + RTE_CACHE_LINE_SIZE, > > + socket_id); > > + > > + size = sizeof(struct gro_tcp_item) * entries_num; > > + tbl->items = (struct gro_tcp_item *)rte_zmalloc_socket( > > + __func__, > > + size, > > + RTE_CACHE_LINE_SIZE, > > + socket_id); > > + tbl->max_item_num = entries_num; > > + > > + size = sizeof(struct gro_tcp_flow) * max_flow_num; > > + tbl->flows = (struct gro_tcp_flow *)rte_zmalloc_socket( > > + __func__, > > + size, RTE_CACHE_LINE_SIZE, > > + socket_id); > > + tbl->max_flow_num = max_flow_num; > > + return tbl; > > +} > > + > > +void gro_tcp_tbl_destroy(void *tbl) > > +{ > > + struct gro_tcp_tbl *tcp_tbl = (struct gro_tcp_tbl *)tbl; > > + > > + if (tcp_tbl) { > > + if (tcp_tbl->items) > > + rte_free(tcp_tbl->items); > > + if (tcp_tbl->flows) > > + rte_free(tcp_tbl->flows); > > + rte_free(tcp_tbl); > > + } > > +} > > + > > +/* update TCP header and IPv4 header checksum */ > > +static void > > +gro_tcp4_cksum_update(struct rte_mbuf *pkt) > > +{ > > + uint32_t len, offset, cksum; > > + struct ether_hdr *eth_hdr; > > + struct ipv4_hdr *ipv4_hdr; > > + struct tcp_hdr *tcp_hdr; > > + uint16_t ipv4_ihl, cksum_pld; > > + > > + if (pkt == NULL) > > + return; > > + > > + len = pkt->pkt_len; > > + eth_hdr = rte_pktmbuf_mtod(pkt, struct ether_hdr *); > > + ipv4_hdr = (struct ipv4_hdr *)(eth_hdr + 1); > > + ipv4_ihl = IPv4_HDR_LEN(ipv4_hdr); > > + tcp_hdr = (struct tcp_hdr *)((char *)ipv4_hdr + ipv4_ihl); > > + > > + offset = sizeof(struct ether_hdr) + ipv4_ihl; > > + len -= offset; > > + > > + /* TCP cksum without IP pseudo header */ > > + ipv4_hdr->hdr_checksum = 0; > > + tcp_hdr->cksum = 0; > > + rte_raw_cksum_mbuf(pkt, offset, len, &cksum_pld); > > + > > + /* IP pseudo header cksum */ > > + cksum = cksum_pld; > > + cksum += rte_ipv4_phdr_cksum(ipv4_hdr, 0); > > + > > + /* combine TCP checksum and IP pseudo header checksum */ > > + cksum = ((cksum & 0xffff0000) >> 16) + (cksum & 0xffff); > > + cksum = (~cksum) & 0xffff; > > + cksum = (cksum == 0) ? 0xffff : cksum; > > + tcp_hdr->cksum = cksum; > > + > > + /* update IP header cksum */ > > + ipv4_hdr->hdr_checksum = rte_ipv4_cksum(ipv4_hdr); > > +} > > + > > +void gro_tcp4_tbl_cksum_update(struct gro_tcp_tbl *tbl) > > +{ > > + uint32_t i; > > + uint32_t item_num = tbl->item_num; > > + > > + for (i = 0; i < tbl->max_item_num; i++) { > > + if (tbl->items[i].is_valid) { > > + item_num--; > > + if (tbl->items[i].is_groed) > > + gro_tcp4_cksum_update(tbl->items[i].pkt); > > + } > > + if (unlikely(item_num == 0)) > > + break; > > + } > > +} > > + > > +/** > > + * merge two TCP/IPv4 packets without update header checksum. > > + */ > > +static int > > +merge_two_tcp4_packets(struct rte_mbuf *pkt_src, > > + struct rte_mbuf *pkt, > > + struct gro_tcp_rule *rule) > > +{ > > + struct ipv4_hdr *ipv4_hdr1, *ipv4_hdr2; > > + struct tcp_hdr *tcp_hdr1; > > + uint16_t ipv4_ihl1, tcp_hl1, tcp_dl1; > > + struct rte_mbuf *tail; > > + > > + /* parse the given packet */ > > + ipv4_hdr1 = (struct ipv4_hdr *)(rte_pktmbuf_mtod(pkt, > > + struct ether_hdr *) + 1); > > + ipv4_ihl1 = IPv4_HDR_LEN(ipv4_hdr1); > > + tcp_hdr1 = (struct tcp_hdr *)((char *)ipv4_hdr1 + ipv4_ihl1); > > + tcp_hl1 = TCP_HDR_LEN(tcp_hdr1); > > + tcp_dl1 = rte_be_to_cpu_16(ipv4_hdr1->total_length) - ipv4_ihl1 > > + - tcp_hl1; > > + > > + /* parse the original packet */ > > + ipv4_hdr2 = (struct ipv4_hdr *)(rte_pktmbuf_mtod(pkt_src, > > + struct ether_hdr *) + 1); > > + > > + /* check reassembly rules */ > > + if (pkt_src->pkt_len + tcp_dl1 > rule->max_packet_size) > > + return -1; > > + > > + /* remove the header of the incoming packet */ > > + rte_pktmbuf_adj(pkt, sizeof(struct ether_hdr) + > > + ipv4_ihl1 + tcp_hl1); > > + > > + /* chain the two packet together */ > > + tail = rte_pktmbuf_lastseg(pkt_src); > > + tail->next = pkt; > > + > > + /* update IP header */ > > + ipv4_hdr2->total_length = rte_cpu_to_be_16( > > + rte_be_to_cpu_16( > > + ipv4_hdr2->total_length) > > + + tcp_dl1); > > + > > + /* update mbuf metadata for the merged packet */ > > + pkt_src->nb_segs++; > > + pkt_src->pkt_len += pkt->pkt_len; > > + return 1; > > +} > > + > > +static int > > +check_seq_option(struct rte_mbuf *pkt, > > + struct tcp_hdr *tcp_hdr, > > + uint16_t tcp_hl) > > +{ > > + struct ipv4_hdr *ipv4_hdr1; > > + struct tcp_hdr *tcp_hdr1; > > + uint16_t ipv4_ihl1, tcp_hl1, tcp_dl1; > > + uint32_t sent_seq1, sent_seq; > > + int ret = -1; > > + > > + ipv4_hdr1 = (struct ipv4_hdr *)(rte_pktmbuf_mtod(pkt, > > + struct ether_hdr *) + 1); > > + ipv4_ihl1 = IPv4_HDR_LEN(ipv4_hdr1); > > + tcp_hdr1 = (struct tcp_hdr *)((char *)ipv4_hdr1 + ipv4_ihl1); > > + tcp_hl1 = TCP_HDR_LEN(tcp_hdr1); > > + tcp_dl1 = rte_be_to_cpu_16(ipv4_hdr1->total_length) - ipv4_ihl1 > > + - tcp_hl1; > > + sent_seq1 = rte_be_to_cpu_32(tcp_hdr1->sent_seq) + tcp_dl1; > > + sent_seq = rte_be_to_cpu_32(tcp_hdr->sent_seq); > > + > > + /* check if the two packets are neighbor */ > > + if ((sent_seq ^ sent_seq1) == 0) { > > + /* check if TCP option field equals */ > > + if (tcp_hl1 > sizeof(struct tcp_hdr)) { > > + if ((tcp_hl1 != tcp_hl) || > > + (memcmp(tcp_hdr1 + 1, > > + tcp_hdr + 1, > > + tcp_hl - sizeof > > + (struct tcp_hdr)) > > + == 0)) > > + ret = 1; > > + } > > + } > > + return ret; > > +} > > + > > +static uint32_t > > +find_an_empty_item(struct gro_tcp_tbl *tbl) > > +{ > > + uint32_t i; > > + > > + for (i = 0; i < tbl->max_item_num; i++) > > + if (tbl->items[i].is_valid == 0) > > + return i; > > + return INVALID_ITEM_INDEX; > > +} > > + > > +static uint16_t > > +find_an_empty_flow(struct gro_tcp_tbl *tbl) > > +{ > > + uint16_t i; > > + > > + for (i = 0; i < tbl->max_flow_num; i++) > > + if (tbl->flows[i].is_valid == 0) > > + return i; > > + return INVALID_FLOW_INDEX; > > +} > > + > > +int32_t > > +gro_tcp4_reassemble(struct rte_mbuf *pkt, > > + struct gro_tcp_tbl *tbl, > > + struct gro_tcp_rule *rule) > > +{ > > + struct ether_hdr *eth_hdr; > > + struct ipv4_hdr *ipv4_hdr; > > + struct tcp_hdr *tcp_hdr; > > + uint16_t ipv4_ihl, tcp_hl, tcp_dl, tcp_cksum, ip_cksum; > > + > > + struct gro_tcp_flow_key key; > > + uint64_t ol_flags; > > + uint32_t cur_idx, prev_idx, item_idx; > > + uint16_t i, flow_idx; > > + > > + eth_hdr = rte_pktmbuf_mtod(pkt, struct ether_hdr *); > > + ipv4_hdr = (struct ipv4_hdr *)(eth_hdr + 1); > > + ipv4_ihl = IPv4_HDR_LEN(ipv4_hdr); > > + > > + /* 1. check if the packet should be processed */ > > + if (ipv4_ihl < sizeof(struct ipv4_hdr)) > > + goto fail; > > + if (ipv4_hdr->next_proto_id != IPPROTO_TCP) > > + goto fail; > > + if ((ipv4_hdr->fragment_offset & > > + rte_cpu_to_be_16(IPV4_HDR_DF_MASK)) > > + == 0) > > + goto fail; > > + > > + tcp_hdr = (struct tcp_hdr *)((char *)ipv4_hdr + ipv4_ihl); > > + tcp_hl = TCP_HDR_LEN(tcp_hdr); > > + tcp_dl = rte_be_to_cpu_16(ipv4_hdr->total_length) - ipv4_ihl > > + - tcp_hl; > > + if (tcp_dl == 0) > > + goto fail; > > + > > + /** > > + * 2. if HW rx checksum offload isn't enabled, recalculate the > > + * checksum in SW. Then, check if the checksum is correct > > + */ > > + ol_flags = pkt->ol_flags; > > + if ((ol_flags & PKT_RX_IP_CKSUM_MASK) != > > + PKT_RX_IP_CKSUM_UNKNOWN) { > > + if (ol_flags == PKT_RX_IP_CKSUM_BAD) > > + goto fail; > > + } else { > > + ip_cksum = ipv4_hdr->hdr_checksum; > > + ipv4_hdr->hdr_checksum = 0; > > + ipv4_hdr->hdr_checksum = rte_ipv4_cksum(ipv4_hdr); > > + if (ipv4_hdr->hdr_checksum ^ ip_cksum) > > + goto fail; > > + } > > + > > + if ((ol_flags & PKT_RX_L4_CKSUM_MASK) != > > + PKT_RX_L4_CKSUM_UNKNOWN) { > > + if (ol_flags == PKT_RX_L4_CKSUM_BAD) > > + goto fail; > > + } else { > > + tcp_cksum = tcp_hdr->cksum; > > + tcp_hdr->cksum = 0; > > + tcp_hdr->cksum = rte_ipv4_udptcp_cksum > > + (ipv4_hdr, tcp_hdr); > > + if (tcp_hdr->cksum ^ tcp_cksum) > > + goto fail; > > + } > > + > > + /** > > + * 3. search for a flow and traverse all packets in the flow > > + * to find one to merge with the given packet. > > + */ > > + key.eth_saddr = eth_hdr->s_addr; > > + key.eth_daddr = eth_hdr->d_addr; > > + key.ip_src_addr[0] = rte_be_to_cpu_32(ipv4_hdr->src_addr); > > + key.ip_dst_addr[0] = rte_be_to_cpu_32(ipv4_hdr->dst_addr); > > + key.src_port = rte_be_to_cpu_16(tcp_hdr->src_port); > > + key.dst_port = rte_be_to_cpu_16(tcp_hdr->dst_port); > > + key.recv_ack = rte_be_to_cpu_32(tcp_hdr->recv_ack); > > + key.tcp_flags = tcp_hdr->tcp_flags; > > + > > + for (i = 0; i < tbl->max_flow_num; i++) { > > + /* search all packets in a valid flow. */ > > + if (tbl->flows[i].is_valid && > > + (memcmp(&(tbl->flows[i].key), &key, > > + sizeof(struct gro_tcp_flow_key)) > > + == 0)) { > > + cur_idx = tbl->flows[i].start_index; > > + prev_idx = cur_idx; > > + while (cur_idx != INVALID_ITEM_INDEX) { > > + if (check_seq_option(tbl->items[cur_idx].pkt, > > + tcp_hdr, > > + tcp_hl) > 0) { > > + if (merge_two_tcp4_packets( > > + tbl->items[cur_idx].pkt, > > + pkt, > > + rule) > 0) { > > + /* successfully merge two packets */ > > + tbl->items[cur_idx].is_groed = 1; > > + return 1; > > + } > > + /** > > + * fail to merge two packets since > > + * break the rules, add the packet > > + * into the flow. > > + */ > > + goto insert_to_existed_flow; > > + } else { > > + prev_idx = cur_idx; > > + cur_idx = tbl->items[cur_idx].next_pkt_idx; > > + } > > + } > > + /** > > + * fail to merge the given packet into an existed flow, > > + * add it into the flow. > > + */ > > +insert_to_existed_flow: > > + item_idx = find_an_empty_item(tbl); > > + /* the item number is beyond the maximum value */ > > + if (item_idx == INVALID_ITEM_INDEX) > > + return -1; > > + tbl->items[prev_idx].next_pkt_idx = item_idx; > > + tbl->items[item_idx].pkt = pkt; > > + tbl->items[item_idx].is_groed = 0; > > + tbl->items[item_idx].next_pkt_idx = INVALID_ITEM_INDEX; > > + tbl->items[item_idx].is_valid = 1; > > + tbl->items[item_idx].start_time = rte_rdtsc(); > > + tbl->item_num++; > > + return 0; > > + } > > + } > > + > > + /** > > + * merge fail as the given packet is a new flow. Therefore, > > + * insert a new flow. > > + */ > > + item_idx = find_an_empty_item(tbl); > > + flow_idx = find_an_empty_flow(tbl); > > + /** > > + * if the flow or item number are beyond the maximum values, > > + * the inputted packet won't be processed. > > + */ > > + if (item_idx == INVALID_ITEM_INDEX || > > + flow_idx == INVALID_FLOW_INDEX) > > + return -1; > > + tbl->items[item_idx].pkt = pkt; > > + tbl->items[item_idx].next_pkt_idx = INVALID_ITEM_INDEX; > > + tbl->items[item_idx].is_groed = 0; > > + tbl->items[item_idx].is_valid = 1; > > + tbl->items[item_idx].start_time = rte_rdtsc(); > > + tbl->item_num++; > > + > > + memcpy(&(tbl->flows[flow_idx].key), > > + &key, sizeof(struct gro_tcp_flow_key)); > > + tbl->flows[flow_idx].start_index = item_idx; > > + tbl->flows[flow_idx].is_valid = 1; > > + tbl->flow_num++; > > + > > + return 0; > > +fail: > > + return -1; > > +} > > + > > +uint16_t gro_tcp_tbl_flush(struct gro_tcp_tbl *tbl, > > + uint16_t flush_num, > > + struct rte_mbuf **out, > > + const uint16_t nb_out) > > +{ > > + uint16_t num, k; > > + uint16_t i; > > + uint32_t j; > > + > > + k = 0; > > + num = tbl->item_num > flush_num ? flush_num : tbl->item_num; > > + num = num > nb_out ? nb_out : num; > > + if (unlikely(num == 0)) > > + return 0; > > + > > + for (i = 0; i < tbl->max_flow_num; i++) { > > + if (tbl->flows[i].is_valid) { > > + j = tbl->flows[i].start_index; > > + while (j != INVALID_ITEM_INDEX) { > > + /* update checksum for GROed packet */ > > + if (tbl->items[j].is_groed) > > + gro_tcp4_cksum_update(tbl->items[j].pkt); > > + > > + out[k++] = tbl->items[j].pkt; > > + tbl->items[j].is_valid = 0; > > + tbl->item_num--; > > + j = tbl->items[j].next_pkt_idx; > > + > > + if (k == num) { > > + /* delete the flow */ > > + if (j == INVALID_ITEM_INDEX) { > > + tbl->flows[i].is_valid = 0; > > + tbl->flow_num--; > > + } else > > + /* update flow information */ > > + tbl->flows[i].start_index = j; > > + goto end; > > + } > > + } > > + /* delete the flow, as all of its packets are flushed */ > > + tbl->flows[i].is_valid = 0; > > + tbl->flow_num--; > > + } > > + if (tbl->flow_num == 0) > > + goto end; > > + } > > +end: > > + return num; > > +} > > + > > +uint16_t > > +gro_tcp_tbl_timeout_flush(struct gro_tcp_tbl *tbl, > > + uint64_t timeout_cycles, > > + struct rte_mbuf **out, > > + const uint16_t nb_out) > > +{ > > + uint16_t k; > > + uint16_t i; > > + uint32_t j; > > + uint64_t current_time; > > + > > + if (nb_out == 0) > > + return 0; > > + k = 0; > > + current_time = rte_rdtsc(); > > + > > + for (i = 0; i < tbl->max_flow_num; i++) { > > + if (tbl->flows[i].is_valid) { > > + j = tbl->flows[i].start_index; > > + while (j != INVALID_ITEM_INDEX) { > > + if (current_time - tbl->items[j].start_time >= > > + timeout_cycles) { > > + /* update checksum for GROed packet */ > > + if (tbl->items[j].is_groed) > > + gro_tcp4_cksum_update(tbl->items[j].pkt); > > + > > + out[k++] = tbl->items[j].pkt; > > + tbl->items[j].is_valid = 0; > > + tbl->item_num--; > > + j = tbl->items[j].next_pkt_idx; > > + > > + if (k == nb_out && > > + j == INVALID_ITEM_INDEX) { > > + /* delete the flow */ > > + tbl->flows[i].is_valid = 0; > > + tbl->flow_num--; > > + goto end; > > + } else if (k == nb_out && > > + j != INVALID_ITEM_INDEX) { > > + tbl->flows[i].start_index = j; > > + goto end; > > + } > > + } > > + } > > + /* delete the flow, as all of its packets are flushed */ > > + tbl->flows[i].is_valid = 0; > > + tbl->flow_num--; > > + } > > + if (tbl->flow_num == 0) > > + goto end; > > + } > > +end: > > + return k; > > +} > > diff --git a/lib/librte_gro/rte_gro_tcp.h b/lib/librte_gro/rte_gro_tcp.h > > new file mode 100644 > > index 0000000..551efc4 > > --- /dev/null > > +++ b/lib/librte_gro/rte_gro_tcp.h > > @@ -0,0 +1,210 @@ > > +/*- > > + * BSD LICENSE > > + * > > + * Copyright(c) 2016-2017 Intel Corporation. All rights reserved. > > + * > > + * Redistribution and use in source and binary forms, with or without > > + * modification, are permitted provided that the following conditions > > + * are met: > > + * > > + * * Redistributions of source code must retain the above copyright > > + * notice, this list of conditions and the following disclaimer. > > + * * Redistributions in binary form must reproduce the above copyright > > + * notice, this list of conditions and the following disclaimer in > > + * the documentation and/or other materials provided with the > > + * distribution. > > + * * Neither the name of Intel Corporation nor the names of its > > + * contributors may be used to endorse or promote products derived > > + * from this software without specific prior written permission. > > + * > > + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS > > + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT > > + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR > > + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT > > + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, > > + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT > > + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, > > + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY > > + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT > > + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE > > + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. > > + */ > > + > > +#ifndef _RTE_GRO_TCP_H_ > > +#define _RTE_GRO_TCP_H_ > > + > > +#if RTE_BYTE_ORDER == RTE_LITTLE_ENDIAN > > +#define TCP_HDR_LEN(tcph) \ > > + ((tcph->data_off >> 4) * 4) > > +#define IPv4_HDR_LEN(iph) \ > > + ((iph->version_ihl & 0x0f) * 4) > > +#else > > +#define TCP_DATAOFF_MASK 0x0f > > +#define TCP_HDR_LEN(tcph) \ > > + ((tcph->data_off & TCP_DATAOFF_MASK) * 4) > > +#define IPv4_HDR_LEN(iph) \ > > + ((iph->version_ihl >> 4) * 4) > > +#endif > > + > > +#define IPV4_HDR_DF_SHIFT 14 > > +#define IPV4_HDR_DF_MASK (1 << IPV4_HDR_DF_SHIFT) > > + > > +#define INVALID_FLOW_INDEX 0xffffU > > +#define INVALID_ITEM_INDEX 0xffffffffUL > > + > > +#define GRO_TCP_TBL_MAX_FLOW_NUM (UINT16_MAX - 1) > > +#define GRO_TCP_TBL_MAX_ITEM_NUM (UINT32_MAX - 1) > > + > > +/* criteria of mergeing packets */ > > +struct gro_tcp_flow_key { > > + struct ether_addr eth_saddr; > > + struct ether_addr eth_daddr; > > + uint32_t ip_src_addr[4]; /**< IPv4 uses the first 8B */ > > + uint32_t ip_dst_addr[4]; > > + > > + uint32_t recv_ack; /**< acknowledgment sequence number. */ > > + uint16_t src_port; > > + uint16_t dst_port; > > + uint8_t tcp_flags; /**< TCP flags. */ > > +}; > > + > > +struct gro_tcp_flow { > > + struct gro_tcp_flow_key key; > > + uint32_t start_index; /**< the first packet index of the flow */ > > + uint8_t is_valid; > > +}; > > + > > +struct gro_tcp_item { > > + struct rte_mbuf *pkt; /**< packet address. */ > > + /* the time when the packet in added into the table */ > > + uint64_t start_time; > > + uint32_t next_pkt_idx; /**< next packet index. */ > > + /* flag to indicate if the packet is GROed */ > > + uint8_t is_groed; > > + uint8_t is_valid; /**< flag indicates if the item is valid */ > > +}; > > + > > +/** > > + * TCP reassembly table. Both TCP/IPv4 and TCP/IPv6 use the same table > > + * structure. > > + */ > > +struct gro_tcp_tbl { > > + struct gro_tcp_item *items; /**< item array */ > > + struct gro_tcp_flow *flows; /**< flow array */ > > + uint32_t item_num; /**< current item number */ > > + uint16_t flow_num; /**< current flow num */ > > + uint32_t max_item_num; /**< item array size */ > > + uint16_t max_flow_num; /**< flow array size */ > > +}; > > + > > +/* rules to reassemble TCP packets, which are decided by applications */ > > +struct gro_tcp_rule { > > + /* the maximum packet length after merged */ > > + uint32_t max_packet_size; > > +}; > > Are there any other rules? If not, I prefer to use max_packet_size directly. If we agree to use a flag to indicate if check checksum, this structure should be used to keep this flag. > > > + > > +/** > > + * This function is to update TCP and IPv4 header checksums > > + * for merged packets in the TCP reassembly table. > > + */ > > +void gro_tcp4_tbl_cksum_update(struct gro_tcp_tbl *tbl); > > + > > +/** > > + * This function creates a TCP reassembly table. > > + * > > + * @param socket_id > > + * socket index where the Ethernet port connects to. > > + * @param max_flow_num > > + * the maximum number of flows in the TCP GRO table > > + * @param max_item_per_flow > > + * the maximum packet number per flow. > > + * @return > > + * if create successfully, return a pointer which points to the > > + * created TCP GRO table. Otherwise, return NULL. > > + */ > > +void *gro_tcp_tbl_create(uint16_t socket_id, > > + uint16_t max_flow_num, > > + uint16_t max_item_per_flow); > > + > > +/** > > + * This function destroys a TCP reassembly table. > > + * @param tbl > > + * a pointer points to the TCP reassembly table. > > + */ > > +void gro_tcp_tbl_destroy(void *tbl); > > + > > +/** > > + * This function searches for a packet in the TCP reassembly table to > > + * merge with the inputted one. To merge two packets is to chain them > > + * together and update packet headers. Note that this function won't > > + * re-calculate IPv4 and TCP checksums. > > + * > > + * If the packet doesn't have data, or with wrong checksums, or is > > + * fragmented etc., errors happen and gro_tcp4_reassemble returns > > + * immediately. If no errors happen, the packet is either merged, or > > + * inserted into the reassembly table. > > + * > > + * If applications want to get packets in the reassembly table, they > > + * need to manually flush the packets. > > + * > > + * @param pkt > > + * packet to reassemble. > > + * @param tbl > > + * a pointer that points to a TCP reassembly table. > > + * @param rule > > + * TCP reassembly criteria defined by applications. > > + * @return > > + * if the inputted packet is merged successfully, return an positive > > + * value. If the packet hasn't be merged with any packets in the TCP > > + * reassembly table. If errors happen, return a negative value and the > > + * packet won't be inserted into the reassemble table. > > + */ > > +int32_t > > +gro_tcp4_reassemble(struct rte_mbuf *pkt, > > + struct gro_tcp_tbl *tbl, > > + struct gro_tcp_rule *rule); > > + > > +/** > > + * This function flushes the packets in a TCP reassembly table to > > + * applications. Before returning the packets, it will update TCP and > > + * IPv4 header checksums. > > + * > > + * @param tbl > > + * a pointer that points to a TCP GRO table. > > + * @param flush_num > > + * the number of packets that applications want to flush. > > + * @param out > > + * pointer array which is used to keep flushed packets. > > + * @param nb_out > > + * the maximum element number of out. > > + * @return > > + * the number of packets that are flushed finally. > > + */ > > +uint16_t > > +gro_tcp_tbl_flush(struct gro_tcp_tbl *tbl, > > + uint16_t flush_num, > > + struct rte_mbuf **out, > > + const uint16_t nb_out); > > + > > +/** > > + * This function flushes timeout packets in a TCP reassembly table to > > + * applications. Before returning the packets, it updates TCP and IPv4 > > + * header checksums. > > + * > > + * @param tbl > > + * a pointer that points to a TCP GRO table. > > + * @param timeout_cycles > > + * the maximum time that packets can stay in the table. > > + * @param out > > + * pointer array which is used to keep flushed packets. > > + * @param nb_out > > + * the maximum element number of out. > > + * @return > > + * It returns the number of packets that are flushed finally. > > + */ > > +uint16_t > > +gro_tcp_tbl_timeout_flush(struct gro_tcp_tbl *tbl, > > + uint64_t timeout_cycles, > > + struct rte_mbuf **out, > > + const uint16_t nb_out); > > +#endif