From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mails.dpdk.org (mails.dpdk.org [217.70.189.124]) by inbox.dpdk.org (Postfix) with ESMTP id 1281D436AC; Fri, 8 Dec 2023 18:54:16 +0100 (CET) Received: from mails.dpdk.org (localhost [127.0.0.1]) by mails.dpdk.org (Postfix) with ESMTP id B76BF43297; Fri, 8 Dec 2023 18:54:15 +0100 (CET) Received: from mail-pg1-f181.google.com (mail-pg1-f181.google.com [209.85.215.181]) by mails.dpdk.org (Postfix) with ESMTP id ECBF743001 for ; Fri, 8 Dec 2023 18:54:13 +0100 (CET) Received: by mail-pg1-f181.google.com with SMTP id 41be03b00d2f7-5c66bbb3d77so1856204a12.0 for ; Fri, 08 Dec 2023 09:54:13 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1702058053; x=1702662853; darn=dpdk.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=Df5GQODmfNDsDTL+tCtE4NeTY+fBRBw7tkBUMx6j/8o=; b=GIpupMB6+MPHtGv7EyRcNfvghML8LQ4aIvoTJzObhKm+/wXygsieOWDJl2zC3RwDvD cEpTSxXRvP4Vb9FLDea+l107Q5el0rTRUEnlRa9/B3rM1PDGID88SlGiy/XoHycpKqx9 fLXmh+BsmbObAINmsSkWH1izc6d0OZsaNPcbLsHai4wjHP/g+R93YX1c5wTVYmaFUKon DScfqXGnf9hhymrN1ctJ3HrdALUztYylz50q32Hbl67uU7UqahhvgufvtSjAkMcU5ooj qOx6ycmr48763p6wbNUsPcSfGras0MKFb5W9tj9k4Pv7ls7/JCisoeIRvMgOzZSwjBRk dCag== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1702058053; x=1702662853; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=Df5GQODmfNDsDTL+tCtE4NeTY+fBRBw7tkBUMx6j/8o=; b=fczU7Eynj/djYVeUaby4iaWdsLnIw39LzgbSHN8L8yQEAcdx5BMcieDNB4E1kmoH32 yUSKdpKakjVFkMZzQNwSTDztohv7xr5s9Ve6HJ+PUUKPaHowvyoznVVIv6EedFB5aVkx f9GzqqZRps8h63y3XEIKoE8HmlN1X2YevpMRX06wQuH51OcwIlB0APvbFHN+GmIN2xt2 POlJxAYBAOufgT854DoJjK2KxjqcrSx1vOpPegUyOB8YuIn/j8P1Mlo6vH5hyYwsdMsg SECbVdSAG77S6gv3gAnm+r1Q/blN7DHZLAvPCHcskKU/lh1mTzR1N31rdglrWdjAxcAc bZow== X-Gm-Message-State: AOJu0Yx95j1U35OlCB/Nsyqz4pFXy7Uat7OUST7GvdANf0YJ8ETsPkba ekKW5HZgzNuKJpkxKcC9G7hWUoCshTs= X-Google-Smtp-Source: AGHT+IHNQNdEuDaT5hy1f1JmigUgtA923bch99XoXcBlAjb5ipsUBScC/vYyIfyaq5+NK4DKE8IabQ== X-Received: by 2002:a05:6a21:350d:b0:18c:8db0:2a2c with SMTP id zc13-20020a056a21350d00b0018c8db02a2cmr586294pzb.17.1702058052643; Fri, 08 Dec 2023 09:54:12 -0800 (PST) Received: from IDCREDBOX918.fareast.corp.microsoft.com ([167.220.238.196]) by smtp.gmail.com with ESMTPSA id h66-20020a636c45000000b005b9288d51f0sm1808647pgc.48.2023.12.08.09.54.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 08 Dec 2023 09:54:12 -0800 (PST) From: Kumara Parameshwaran To: dev@dpdk.org Cc: hujiayu.hu@foxmail.com, Kumara Parameshwaran , Kumara Parameshwaran Subject: [PATCH v6] gro: fix reordering of packets in GRO layer Date: Fri, 8 Dec 2023 23:24:00 +0530 Message-Id: <20231208175400.22388-1-kumaraparamesh92@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20221101070557.58808-1-kumaraparmesh92@gmail.com> References: <20221101070557.58808-1-kumaraparmesh92@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org In the current implementation when packets is received with special flag(s) set, only that packet is delivered out of order. There could be already coalesced packets in the GRO table beloging to the same flow but not handled. This fix makes sure that the entire segment is delivered with the special flag(s) set which is how the Linux GRO is also implemented Signed-off-by: Kumara Parameshwaran Co-authored-by: Kumara Parameshwaran --- If the received packet is not a pure ACK packet, we check if there are any previous packets in the flow, if present we indulge the received packet also in the coalescing logic and update the flags of the last recived packet to the entire segment which would avoid re-ordering. Lets say a case where P1(PSH), P2(ACK), P3(ACK) are received in burst mode, P1 contains PSH flag and since it does not contain any prior packets in the flow we copy it to unprocess_packets and P2(ACK) and P3(ACK) are merged together. In the existing case the P2,P3 would be delivered as single segment first and the unprocess_packets will be copied later which will cause reordering. With the patch copy the unprocess packets first and then the packets from the GRO table. Testing done The csum test-pmd was modified to support the following GET request of 10MB from client to server via test-pmd (static arp entries added in client and server). Enable GRO and TSO in test-pmd where the packets recived from the client mac would be sent to server mac and vice versa. In above testing, without the patch the client observerd re-ordering of 25 packets and with the patch there were no packet re-ordering observerd. v2: Fix warnings in commit and comment. Do not consider packet as candidate to merge if it contains SYN/RST flag. v3: Fix warnings. v4: Rebase with master. v5: Adding co-author email v6: Address review comments from the maintainer to restructure the code and handle only special flags PSH,FIN lib/gro/gro_tcp.h | 10 +++++++ lib/gro/gro_tcp4.c | 65 +++++++++++++++++++++++++++++----------------- 2 files changed, 51 insertions(+), 24 deletions(-) diff --git a/lib/gro/gro_tcp.h b/lib/gro/gro_tcp.h index d926c4b8cc..d2073b02f3 100644 --- a/lib/gro/gro_tcp.h +++ b/lib/gro/gro_tcp.h @@ -187,4 +187,14 @@ is_same_common_tcp_key(struct cmn_tcp_key *k1, struct cmn_tcp_key *k2) return (!memcmp(k1, k2, sizeof(struct cmn_tcp_key))); } +static inline void +update_tcp_hdr_flags(struct rte_tcp_hdr *tcp_hdr, struct rte_mbuf *pkt) +{ + struct rte_tcp_hdr *merged_tcp_hdr; + + merged_tcp_hdr = rte_pktmbuf_mtod_offset(pkt, struct rte_tcp_hdr *, pkt->l2_len + pkt->l3_len); + merged_tcp_hdr->tcp_flags |= tcp_hdr->tcp_flags; + +} + #endif diff --git a/lib/gro/gro_tcp4.c b/lib/gro/gro_tcp4.c index 6645de592b..6745ebc45e 100644 --- a/lib/gro/gro_tcp4.c +++ b/lib/gro/gro_tcp4.c @@ -126,6 +126,7 @@ gro_tcp4_reassemble(struct rte_mbuf *pkt, uint32_t item_idx; uint32_t i, max_flow_num, remaining_flow_num; uint8_t find; + uint32_t item_start_idx; /* * Don't process the packet whose TCP header length is greater @@ -139,13 +140,6 @@ gro_tcp4_reassemble(struct rte_mbuf *pkt, tcp_hdr = (struct rte_tcp_hdr *)((char *)ipv4_hdr + pkt->l3_len); hdr_len = pkt->l2_len + pkt->l3_len + pkt->l4_len; - /* - * Don't process the packet which has FIN, SYN, RST, PSH, URG, ECE - * or CWR set. - */ - if (tcp_hdr->tcp_flags != RTE_TCP_ACK_FLAG) - return -1; - /* trim the tail padding bytes */ ip_tlen = rte_be_to_cpu_16(ipv4_hdr->total_length); if (pkt->pkt_len > (uint32_t)(ip_tlen + pkt->l2_len)) @@ -183,6 +177,7 @@ gro_tcp4_reassemble(struct rte_mbuf *pkt, if (tbl->flows[i].start_index != INVALID_ARRAY_INDEX) { if (is_same_tcp4_flow(tbl->flows[i].key, key)) { find = 1; + item_start_idx = tbl->flows[i].start_index; break; } remaining_flow_num--; @@ -190,28 +185,50 @@ gro_tcp4_reassemble(struct rte_mbuf *pkt, } if (find == 0) { - sent_seq = rte_be_to_cpu_32(tcp_hdr->sent_seq); - item_idx = insert_new_tcp_item(pkt, tbl->items, &tbl->item_num, - tbl->max_item_num, start_time, - INVALID_ARRAY_INDEX, sent_seq, ip_id, - is_atomic); - if (item_idx == INVALID_ARRAY_INDEX) + /* + * Add new flow to the table only if contains ACK flag with data. + * Do not add any packets with additional tcp flags to the GRO table + */ + if (tcp_hdr->tcp_flags == RTE_TCP_ACK_FLAG) { + sent_seq = rte_be_to_cpu_32(tcp_hdr->sent_seq); + item_idx = insert_new_tcp_item(pkt, tbl->items, &tbl->item_num, + tbl->max_item_num, start_time, + INVALID_ARRAY_INDEX, sent_seq, ip_id, + is_atomic); + if (item_idx == INVALID_ARRAY_INDEX) + return -1; + if (insert_new_flow(tbl, &key, item_idx) == + INVALID_ARRAY_INDEX) { + /* + * Fail to insert a new flow, so delete the + * stored packet. + */ + delete_tcp_item(tbl->items, item_idx, &tbl->item_num, INVALID_ARRAY_INDEX); + return -1; + } + return 0; + } else { return -1; - if (insert_new_flow(tbl, &key, item_idx) == - INVALID_ARRAY_INDEX) { - /* - * Fail to insert a new flow, so delete the - * stored packet. - */ - delete_tcp_item(tbl->items, item_idx, &tbl->item_num, INVALID_ARRAY_INDEX); + } + } else { + /* + * Any packet with additional flags like PSH,FIN should be processed and flushed immediately. + * Hence marking the start time to 0, so that the packets will be flushed immediately in timer + * mode. + */ + if (tcp_hdr->tcp_flags & (RTE_TCP_ACK_FLAG|RTE_TCP_PSH_FLAG|RTE_TCP_FIN_FLAG)) { + if (tcp_hdr->tcp_flags != RTE_TCP_ACK_FLAG) { + tbl->items[item_start_idx].start_time = 0; + } + return process_tcp_item(pkt, tcp_hdr, tcp_dl, tbl->items, tbl->flows[i].start_index, + &tbl->item_num, tbl->max_item_num, + ip_id, is_atomic, start_time); + } else { return -1; } - return 0; } - return process_tcp_item(pkt, tcp_hdr, tcp_dl, tbl->items, tbl->flows[i].start_index, - &tbl->item_num, tbl->max_item_num, - ip_id, is_atomic, start_time); + return -1; } /* -- 2.34.1