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The functions always return skb->network_header, which in the case of encapsulated packets at the gro complete phase, is always set to the innermost L3 of the packet. That means that calling {ip,ipv6}_hdr for skbs which completed the GRO receive phase (both in gro_list and *_gro_complete) when parsing an encapsulated packet's _outer_ L3/L4 may return an unexpected value. This incorrect usage leads to a bug in GRO's UDP socket lookup. udp{4,6}_lib_lookup_skb functions use ip_hdr/ipv6_hdr respectively. These *_hdr functions return network_header which will point to the innermost L3, resulting in the wrong offset being used in __udp{4,6}_lib_lookup with encapsulated packets. Reproduction example: Endpoint configuration example (fou + local address bind) # ip fou add port 6666 ipproto 4 # ip link add name tun1 type ipip remote 2.2.2.1 local 2.2.2.2 encap fou encap-dport 5555 encap-sport 6666 mode ipip # ip link set tun1 up # ip a add 1.1.1.2/24 dev tun1 Netperf TCP_STREAM result on net-next before patch is applied: net-next main, GRO enabled: $ netperf -H 1.1.1.2 -t TCP_STREAM -l 5 Recv Send Send Socket Socket Message Elapsed Size Size Size Time Throughput bytes bytes bytes secs. 10^6bits/sec 131072 16384 16384 5.28 2.37 net-next main, GRO disabled: $ netperf -H 1.1.1.2 -t TCP_STREAM -l 5 Recv Send Send Socket Socket Message Elapsed Size Size Size Time Throughput bytes bytes bytes secs. 10^6bits/sec 131072 16384 16384 5.01 2745.06 patch applied, GRO enabled: $ netperf -H 1.1.1.2 -t TCP_STREAM -l 5 Recv Send Send Socket Socket Message Elapsed Size Size Size Time Throughput bytes bytes bytes secs. 10^6bits/sec 131072 16384 16384 5.01 2877.38 This patch fixes this bug and prevents similar future misuse of network_header by setting network_header and inner_network_header to their respective values during the receive phase of GRO. This results in more coherent {inner_,}network_header values for every skb in gro_list, which also means there's no need to set/fix these values before passing the packet forward. network_header is already set in dev_gro_receive and under encapsulation we set inner_network_header. *_gro_complete functions use a new helper function - skb_gro_complete_network_header, which returns the network_header/inner_network_header offset during the GRO complete phase, depending on skb->encapsulation. Fixes: 57c67ff4bd92 ("udp: additional GRO support") Signed-off-by: Richard Gobert --- include/net/gro.h | 14 +++++++++++++- net/8021q/vlan_core.c | 3 +++ net/ipv4/af_inet.c | 8 ++++---- net/ipv4/tcp_offload.c | 2 +- net/ipv4/udp_offload.c | 2 +- net/ipv6/ip6_offload.c | 11 +++++------ net/ipv6/tcpv6_offload.c | 2 +- net/ipv6/udp_offload.c | 2 +- 8 files changed, 29 insertions(+), 15 deletions(-) diff --git a/include/net/gro.h b/include/net/gro.h index b435f0ddbf64..89502a7e35ed 100644 --- a/include/net/gro.h +++ b/include/net/gro.h @@ -177,10 +177,22 @@ static inline void *skb_gro_header(struct sk_buff *skb, return ptr; } +static inline int skb_gro_network_offset(struct sk_buff *skb) +{ + return NAPI_GRO_CB(skb)->encap_mark ? skb_inner_network_offset(skb) : + skb_network_offset(skb); +} + static inline void *skb_gro_network_header(struct sk_buff *skb) { return (NAPI_GRO_CB(skb)->frag0 ?: skb->data) + - skb_network_offset(skb); + skb_gro_network_offset(skb); +} + +static inline void *skb_gro_complete_network_header(struct sk_buff *skb) +{ + return skb->encapsulation ? skb_inner_network_header(skb) : + skb_network_header(skb); } static inline __wsum inet_gro_compute_pseudo(struct sk_buff *skb, int proto) diff --git a/net/8021q/vlan_core.c b/net/8021q/vlan_core.c index f00158234505..8bc871397e47 100644 --- a/net/8021q/vlan_core.c +++ b/net/8021q/vlan_core.c @@ -478,6 +478,9 @@ static struct sk_buff *vlan_gro_receive(struct list_head *head, if (unlikely(!vhdr)) goto out; + if (!NAPI_GRO_CB(skb)->encap_mark) + skb_set_network_header(skb, hlen); + type = vhdr->h_vlan_encapsulated_proto; ptype = gro_find_receive_by_type(type); diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c index 835f4f9d98d2..c0f3c162bf73 100644 --- a/net/ipv4/af_inet.c +++ b/net/ipv4/af_inet.c @@ -1564,7 +1564,9 @@ struct sk_buff *inet_gro_receive(struct list_head *head, struct sk_buff *skb) NAPI_GRO_CB(skb)->is_atomic = !!(iph->frag_off & htons(IP_DF)); NAPI_GRO_CB(skb)->flush |= flush; - skb_set_network_header(skb, off); + if (NAPI_GRO_CB(skb)->encap_mark) + skb_set_inner_network_header(skb, off); + /* The above will be needed by the transport layer if there is one * immediately following this IP hdr. */ @@ -1643,10 +1645,8 @@ int inet_gro_complete(struct sk_buff *skb, int nhoff) int proto = iph->protocol; int err = -ENOSYS; - if (skb->encapsulation) { + if (skb->encapsulation) skb_set_inner_protocol(skb, cpu_to_be16(ETH_P_IP)); - skb_set_inner_network_header(skb, nhoff); - } iph_set_totlen(iph, skb->len - nhoff); csum_replace2(&iph->check, totlen, iph->tot_len); diff --git a/net/ipv4/tcp_offload.c b/net/ipv4/tcp_offload.c index 8311c38267b5..8bbcd3f502ac 100644 --- a/net/ipv4/tcp_offload.c +++ b/net/ipv4/tcp_offload.c @@ -330,7 +330,7 @@ struct sk_buff *tcp4_gro_receive(struct list_head *head, struct sk_buff *skb) INDIRECT_CALLABLE_SCOPE int tcp4_gro_complete(struct sk_buff *skb, int thoff) { - const struct iphdr *iph = ip_hdr(skb); + const struct iphdr *iph = skb_gro_complete_network_header(skb); struct tcphdr *th = tcp_hdr(skb); th->check = ~tcp_v4_check(skb->len - thoff, iph->saddr, diff --git a/net/ipv4/udp_offload.c b/net/ipv4/udp_offload.c index 6c95d28d0c4a..7f59cede67f5 100644 --- a/net/ipv4/udp_offload.c +++ b/net/ipv4/udp_offload.c @@ -709,7 +709,7 @@ EXPORT_SYMBOL(udp_gro_complete); INDIRECT_CALLABLE_SCOPE int udp4_gro_complete(struct sk_buff *skb, int nhoff) { - const struct iphdr *iph = ip_hdr(skb); + const struct iphdr *iph = skb_gro_complete_network_header(skb); struct udphdr *uh = (struct udphdr *)(skb->data + nhoff); /* do fraglist only if there is no outer UDP encap (or we already processed it) */ diff --git a/net/ipv6/ip6_offload.c b/net/ipv6/ip6_offload.c index cca64c7809be..db7e3db587b9 100644 --- a/net/ipv6/ip6_offload.c +++ b/net/ipv6/ip6_offload.c @@ -67,7 +67,7 @@ static int ipv6_gro_pull_exthdrs(struct sk_buff *skb, int off, int proto) off += len; } - skb_gro_pull(skb, off - skb_network_offset(skb)); + skb_gro_pull(skb, off - skb_gro_network_offset(skb)); return proto; } @@ -236,7 +236,8 @@ INDIRECT_CALLABLE_SCOPE struct sk_buff *ipv6_gro_receive(struct list_head *head, if (unlikely(!iph)) goto out; - skb_set_network_header(skb, off); + if (NAPI_GRO_CB(skb)->encap_mark) + skb_set_inner_network_header(skb, off); flush += ntohs(iph->payload_len) != skb->len - hlen; @@ -259,7 +260,7 @@ INDIRECT_CALLABLE_SCOPE struct sk_buff *ipv6_gro_receive(struct list_head *head, NAPI_GRO_CB(skb)->proto = proto; flush--; - nlen = skb_network_header_len(skb); + nlen = skb_gro_offset(skb) - off; list_for_each_entry(p, head, list) { const struct ipv6hdr *iph2; @@ -353,10 +354,8 @@ INDIRECT_CALLABLE_SCOPE int ipv6_gro_complete(struct sk_buff *skb, int nhoff) int err = -ENOSYS; u32 payload_len; - if (skb->encapsulation) { + if (skb->encapsulation) skb_set_inner_protocol(skb, cpu_to_be16(ETH_P_IPV6)); - skb_set_inner_network_header(skb, nhoff); - } payload_len = skb->len - nhoff - sizeof(*iph); if (unlikely(payload_len > IPV6_MAXPLEN)) { diff --git a/net/ipv6/tcpv6_offload.c b/net/ipv6/tcpv6_offload.c index bf0c957e4b5e..79eeaced2834 100644 --- a/net/ipv6/tcpv6_offload.c +++ b/net/ipv6/tcpv6_offload.c @@ -29,7 +29,7 @@ struct sk_buff *tcp6_gro_receive(struct list_head *head, struct sk_buff *skb) INDIRECT_CALLABLE_SCOPE int tcp6_gro_complete(struct sk_buff *skb, int thoff) { - const struct ipv6hdr *iph = ipv6_hdr(skb); + const struct ipv6hdr *iph = skb_gro_complete_network_header(skb); struct tcphdr *th = tcp_hdr(skb); th->check = ~tcp_v6_check(skb->len - thoff, &iph->saddr, diff --git a/net/ipv6/udp_offload.c b/net/ipv6/udp_offload.c index 6b95ba241ebe..897caa2e39fb 100644 --- a/net/ipv6/udp_offload.c +++ b/net/ipv6/udp_offload.c @@ -164,7 +164,7 @@ struct sk_buff *udp6_gro_receive(struct list_head *head, struct sk_buff *skb) INDIRECT_CALLABLE_SCOPE int udp6_gro_complete(struct sk_buff *skb, int nhoff) { - const struct ipv6hdr *ipv6h = ipv6_hdr(skb); + const struct ipv6hdr *ipv6h = skb_gro_complete_network_header(skb); struct udphdr *uh = (struct udphdr *)(skb->data + nhoff); /* do fraglist only if there is no outer UDP encap (or we already processed it) */ From patchwork Thu Feb 22 21:07:00 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Richard Gobert X-Patchwork-Id: 775646 Received: from mail-wr1-f43.google.com (mail-wr1-f43.google.com [209.85.221.43]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6D41E7172E; 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Thu, 22 Feb 2024 13:07:19 -0800 (PST) Received: from debian ([146.70.204.204]) by smtp.gmail.com with ESMTPSA id bx9-20020a5d5b09000000b0033d568f8310sm198145wrb.89.2024.02.22.13.07.13 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 22 Feb 2024 13:07:19 -0800 (PST) Message-ID: <2622ff3b-144f-4038-8f05-82c01afc5ce3@gmail.com> Date: Thu, 22 Feb 2024 22:07:00 +0100 Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Subject: [PATCH net-next 2/3] selftests/net: add local address bind in vxlan selftest To: davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, dsahern@kernel.org, shuah@kernel.org, liujian56@huawei.com, horms@kernel.org, aleksander.lobakin@intel.com, linyunsheng@huawei.com, therbert@google.com, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org References: From: Richard Gobert In-Reply-To: Add local address bind support to existing udpgro_fwd.sh vxlan selftest, to ensure UDP socket lookup in GRO is working. Signed-off-by: Richard Gobert --- tools/testing/selftests/net/udpgro_fwd.sh | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/tools/testing/selftests/net/udpgro_fwd.sh b/tools/testing/selftests/net/udpgro_fwd.sh index c079565add39..8cc9b6ff3910 100755 --- a/tools/testing/selftests/net/udpgro_fwd.sh +++ b/tools/testing/selftests/net/udpgro_fwd.sh @@ -56,11 +56,13 @@ create_vxlan_endpoint() { local -r bm_rem_addr=$3 local -r vxlan_dev=$4 local -r vxlan_id=$5 + local -r bm_local_addr=$6 local -r vxlan_port=4789 ip -n $netns link set dev $bm_dev up ip -n $netns link add dev $vxlan_dev type vxlan id $vxlan_id \ - dstport $vxlan_port remote $bm_rem_addr + dstport $vxlan_port local $bm_local_addr \ + remote $bm_rem_addr ip -n $netns link set dev $vxlan_dev up } @@ -71,11 +73,13 @@ create_vxlan_pair() { for ns in $SRC $DST; do # note that 3 - $SRC == $DST and 3 - $DST == $SRC - create_vxlan_endpoint $BASE$ns veth$ns $BM_NET_V4$((3 - $ns)) vxlan$ns 4 + create_vxlan_endpoint $BASE$ns veth$ns $BM_NET_V4$((3 - $ns)) \ + vxlan$ns 4 $BM_NET_V4$ns ip -n $BASE$ns addr add dev vxlan$ns $OL_NET_V4$ns/24 done for ns in $SRC $DST; 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Thu, 22 Feb 2024 13:12:35 -0800 (PST) Message-ID: Date: Thu, 22 Feb 2024 22:12:12 +0100 Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Subject: [PATCH net-next 3/3] net: gro: move L3 flush checks to tcp_gro_receive To: davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, dsahern@kernel.org, shuah@kernel.org, liujian56@huawei.com, horms@kernel.org, aleksander.lobakin@intel.com, linyunsheng@huawei.com, therbert@google.com, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org References: From: Richard Gobert In-Reply-To: {inet,ipv6}_gro_receive functions perform flush checks (ttl, flags, iph->id, ...) against all packets in a loop. These flush checks are relevant only to tcp flows, and as such they're used to determine whether the packets can be merged later in tcp_gro_receive. These checks are not relevant to UDP packets. Furthermore, they need to be done only once in tcp_gro_receive and only against the found p skb, since they only affect flush and not same_flow. Leveraging the initial commit in the series, correct network header offsets are saved for both outer and inner network headers - allowing these checks to be done only once, in tcp_gro_receive. As a result, NAPI_GRO_CB(p)->flush is not used at all. In addition - flush_id checks are more declarative and contained in inet_gro_flush_id, thus removing the need for flush_id in napi_gro_cb. This results in less parsing code for UDP flows and non-loop flush tests for TCP flows. For example, running 64 IP/UDP netperf connections: ./super_netperf.sh 64 -H 1.1.1.2 -t UDP_STREAM -l 120 Running perf top for 90s we can see that relatively less time is spent on inet_gro_receive: net-next: Samples: 330K of event 'cycles:P', 4000 Hz, Event count (approx.): 45945660156 lost: 0/0 drop: 0/0 1.43% [kernel] [k] inet_gro_receive patch applied: Samples: 295K of event 'cycles:P', 4000 Hz, Event count (approx.): 44726408099 lost: 0/0 drop: 0/0 1.22% [kernel] [k] inet_gro_receive Signed-off-by: Richard Gobert --- include/net/gro.h | 9 ++---- net/core/gro.c | 3 -- net/ipv4/af_inet.c | 36 --------------------- net/ipv4/tcp_offload.c | 71 ++++++++++++++++++++++++++++++++++-------- net/ipv6/ip6_offload.c | 11 ------- 5 files changed, 61 insertions(+), 69 deletions(-) diff --git a/include/net/gro.h b/include/net/gro.h index 89502a7e35ed..e6db591cdc32 100644 --- a/include/net/gro.h +++ b/include/net/gro.h @@ -35,15 +35,15 @@ struct napi_gro_cb { /* This is non-zero if the packet cannot be merged with the new skb. */ u16 flush; - /* Save the IP ID here and check when we get to the transport layer */ - u16 flush_id; - /* Number of segments aggregated. */ u16 count; /* Used in ipv6_gro_receive() and foo-over-udp and esp-in-udp */ u16 proto; + /* used to support CHECKSUM_COMPLETE for tunneling protocols */ + __wsum csum; + /* Used in napi_gro_cb::free */ #define NAPI_GRO_FREE 1 #define NAPI_GRO_FREE_STOLEN_HEAD 2 @@ -83,9 +83,6 @@ struct napi_gro_cb { /* GRO is done by frag_list pointer chaining. */ u8 is_flist:1; ); - - /* used to support CHECKSUM_COMPLETE for tunneling protocols */ - __wsum csum; }; #define NAPI_GRO_CB(skb) ((struct napi_gro_cb *)(skb)->cb) diff --git a/net/core/gro.c b/net/core/gro.c index 0759277dc14e..b7dced5bcef7 100644 --- a/net/core/gro.c +++ b/net/core/gro.c @@ -332,8 +332,6 @@ static void gro_list_prepare(const struct list_head *head, list_for_each_entry(p, head, list) { unsigned long diffs; - NAPI_GRO_CB(p)->flush = 0; - if (hash != skb_get_hash_raw(p)) { NAPI_GRO_CB(p)->same_flow = 0; continue; @@ -466,7 +464,6 @@ static enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff sizeof(u32))); /* Avoid slow unaligned acc */ *(u32 *)&NAPI_GRO_CB(skb)->zeroed = 0; NAPI_GRO_CB(skb)->flush = skb_has_frag_list(skb); - NAPI_GRO_CB(skb)->is_atomic = 1; NAPI_GRO_CB(skb)->count = 1; if (unlikely(skb_is_gso(skb))) { NAPI_GRO_CB(skb)->count = skb_shinfo(skb)->gso_segs; diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c index c0f3c162bf73..fd7378ecc4e3 100644 --- a/net/ipv4/af_inet.c +++ b/net/ipv4/af_inet.c @@ -1509,7 +1509,6 @@ struct sk_buff *inet_gro_receive(struct list_head *head, struct sk_buff *skb) list_for_each_entry(p, head, list) { struct iphdr *iph2; - u16 flush_id; if (!NAPI_GRO_CB(p)->same_flow) continue; @@ -1526,43 +1525,8 @@ struct sk_buff *inet_gro_receive(struct list_head *head, struct sk_buff *skb) NAPI_GRO_CB(p)->same_flow = 0; continue; } - - /* All fields must match except length and checksum. */ - NAPI_GRO_CB(p)->flush |= - (iph->ttl ^ iph2->ttl) | - (iph->tos ^ iph2->tos) | - ((iph->frag_off ^ iph2->frag_off) & htons(IP_DF)); - - NAPI_GRO_CB(p)->flush |= flush; - - /* We need to store of the IP ID check to be included later - * when we can verify that this packet does in fact belong - * to a given flow. - */ - flush_id = (u16)(id - ntohs(iph2->id)); - - /* This bit of code makes it much easier for us to identify - * the cases where we are doing atomic vs non-atomic IP ID - * checks. Specifically an atomic check can return IP ID - * values 0 - 0xFFFF, while a non-atomic check can only - * return 0 or 0xFFFF. - */ - if (!NAPI_GRO_CB(p)->is_atomic || - !(iph->frag_off & htons(IP_DF))) { - flush_id ^= NAPI_GRO_CB(p)->count; - flush_id = flush_id ? 0xFFFF : 0; - } - - /* If the previous IP ID value was based on an atomic - * datagram we can overwrite the value and ignore it. - */ - if (NAPI_GRO_CB(skb)->is_atomic) - NAPI_GRO_CB(p)->flush_id = flush_id; - else - NAPI_GRO_CB(p)->flush_id |= flush_id; } - NAPI_GRO_CB(skb)->is_atomic = !!(iph->frag_off & htons(IP_DF)); NAPI_GRO_CB(skb)->flush |= flush; if (NAPI_GRO_CB(skb)->encap_mark) skb_set_inner_network_header(skb, off); diff --git a/net/ipv4/tcp_offload.c b/net/ipv4/tcp_offload.c index 8bbcd3f502ac..962c1b900e11 100644 --- a/net/ipv4/tcp_offload.c +++ b/net/ipv4/tcp_offload.c @@ -178,6 +178,60 @@ struct sk_buff *tcp_gso_segment(struct sk_buff *skb, return segs; } +static inline bool inet_gro_flush(struct iphdr *iph, struct iphdr *iph2) +{ + /* All fields must match except length and checksum. */ + return (iph->ttl ^ iph2->ttl) | + (iph->tos ^ iph2->tos) | + ((iph->frag_off ^ iph2->frag_off) & htons(IP_DF)); +} + +static inline bool ipv6_gro_flush(struct ipv6hdr *iph, struct ipv6hdr *iph2) +{ + /* */ + __be32 first_word = *(__be32 *)iph ^ *(__be32 *)iph2; + + /* Flush if Traffic Class fields are different. */ + return (first_word & htonl(0x0FF00000)) | + (__force __be32)(iph->hop_limit ^ iph2->hop_limit); +} + +static inline bool inet_gro_flush_id(struct sk_buff *p, struct iphdr *iph, + struct iphdr *iph2) +{ + u16 flush_id = ntohs(iph->id) - ntohs(iph2->id); + u16 is_atomic = !!(iph->frag_off & htons(IP_DF)); + u16 count_masked; + + /* When we receive our second frame we can make a decision on if we + * continue this flow as an atomic flow with a fixed ID or if we use + * an incrementing ID. + */ + if (NAPI_GRO_CB(p)->count == 1) + NAPI_GRO_CB(p)->is_atomic = flush_id == 0; + + /* Ignore outer IP ID value if based on atomic datagram. */ + if (NAPI_GRO_CB(p)->encap_mark && is_atomic && iph2 == ip_hdr(p)) + return false; + + is_atomic &= NAPI_GRO_CB(p)->is_atomic; + count_masked = NAPI_GRO_CB(p)->count & ~(-is_atomic | is_atomic); + + return flush_id ^ count_masked; +} + +static bool tcp_gro_network_flush(struct sk_buff *p, struct sk_buff *skb, + int offset) +{ + void *nh = (NAPI_GRO_CB(skb)->frag0 ?: skb->data) + offset; + void *nh2 = p->data + offset; + + if (((struct iphdr *)nh)->version == 6) + return ipv6_gro_flush(nh, nh2); + + return inet_gro_flush(nh, nh2) | inet_gro_flush_id(p, nh, nh2); +} + struct sk_buff *tcp_gro_receive(struct list_head *head, struct sk_buff *skb) { struct sk_buff *pp = NULL; @@ -232,8 +286,10 @@ struct sk_buff *tcp_gro_receive(struct list_head *head, struct sk_buff *skb) goto out_check_final; found: - /* Include the IP ID check below from the inner most IP hdr */ - flush = NAPI_GRO_CB(p)->flush; + flush = tcp_gro_network_flush(p, skb, skb_network_offset(skb)); + if (NAPI_GRO_CB(skb)->encap_mark) + flush |= tcp_gro_network_flush(p, skb, skb_inner_network_offset(skb)); + flush |= (__force int)(flags & TCP_FLAG_CWR); flush |= (__force int)((flags ^ tcp_flag_word(th2)) & ~(TCP_FLAG_CWR | TCP_FLAG_FIN | TCP_FLAG_PSH)); @@ -242,17 +298,6 @@ struct sk_buff *tcp_gro_receive(struct list_head *head, struct sk_buff *skb) flush |= *(u32 *)((u8 *)th + i) ^ *(u32 *)((u8 *)th2 + i); - /* When we receive our second frame we can made a decision on if we - * continue this flow as an atomic flow with a fixed ID or if we use - * an incrementing ID. - */ - if (NAPI_GRO_CB(p)->flush_id != 1 || - NAPI_GRO_CB(p)->count != 1 || - !NAPI_GRO_CB(p)->is_atomic) - flush |= NAPI_GRO_CB(p)->flush_id; - else - NAPI_GRO_CB(p)->is_atomic = false; - mss = skb_shinfo(p)->gso_size; /* If skb is a GRO packet, make sure its gso_size matches prior packet mss. diff --git a/net/ipv6/ip6_offload.c b/net/ipv6/ip6_offload.c index db7e3db587b9..8bf93a0e9669 100644 --- a/net/ipv6/ip6_offload.c +++ b/net/ipv6/ip6_offload.c @@ -291,19 +291,8 @@ INDIRECT_CALLABLE_SCOPE struct sk_buff *ipv6_gro_receive(struct list_head *head, nlen - sizeof(struct ipv6hdr))) goto not_same_flow; } - /* flush if Traffic Class fields are different */ - NAPI_GRO_CB(p)->flush |= !!((first_word & htonl(0x0FF00000)) | - (__force __be32)(iph->hop_limit ^ iph2->hop_limit)); - NAPI_GRO_CB(p)->flush |= flush; - - /* If the previous IP ID value was based on an atomic - * datagram we can overwrite the value and ignore it. - */ - if (NAPI_GRO_CB(skb)->is_atomic) - NAPI_GRO_CB(p)->flush_id = 0; } - NAPI_GRO_CB(skb)->is_atomic = true; NAPI_GRO_CB(skb)->flush |= flush; skb_gro_postpull_rcsum(skb, iph, nlen);