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* net: gro: fix napi_gro_cb zeroed alignmentRichard Gobert2024-05-141-2/+4
| | | | | | | | | | | Add 2 byte padding to napi_gro_cb struct to ensure zeroed member is aligned after flush_id member was removed in the original commit. Fixes: 4b0ebbca3e16 ("net: gro: move L3 flush checks to tcp_gro_receive and udp_gro_receive_segment") Suggested-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Richard Gobert <richardbgobert@gmail.com> Link: https://lore.kernel.org/r/fca08735-c245-49e5-af72-82900634f144@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
* net: gro: move L3 flush checks to tcp_gro_receive and udp_gro_receive_segmentRichard Gobert2024-05-131-8/+68
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | {inet,ipv6}_gro_receive functions perform flush checks (ttl, flags, iph->id, ...) against all packets in a loop. These flush checks are used in all merging UDP and TCP flows. These checks need to be done only once and only against the found p skb, since they only affect flush and not same_flow. This patch leverages correct network header offsets from the cb for both outer and inner network headers - allowing these checks to be done only once, in tcp_gro_receive and udp_gro_receive_segment. 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, thus removing the need for flush_id in napi_gro_cb. This results in less parsing code for non-loop flush tests for TCP and UDP flows. To make sure results are not within noise range - I've made netfilter drop all TCP packets, and measured CPU performance in GRO (in this case GRO is responsible for about 50% of the CPU utilization). perf top while replaying 64 parallel IP/TCP streams merging in GRO: (gro_receive_network_flush is compiled inline to tcp_gro_receive) net-next: 6.94% [kernel] [k] inet_gro_receive 3.02% [kernel] [k] tcp_gro_receive patch applied: 4.27% [kernel] [k] tcp_gro_receive 4.22% [kernel] [k] inet_gro_receive perf top while replaying 64 parallel IP/IP/TCP streams merging in GRO (same results for any encapsulation, in this case inet_gro_receive is top offender in net-next) net-next: 10.09% [kernel] [k] inet_gro_receive 2.08% [kernel] [k] tcp_gro_receive patch applied: 6.97% [kernel] [k] inet_gro_receive 3.68% [kernel] [k] tcp_gro_receive Signed-off-by: Richard Gobert <richardbgobert@gmail.com> Reviewed-by: Willem de Bruijn <willemb@google.com> Link: https://lore.kernel.org/r/20240509190819.2985-3-richardbgobert@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
* net: gro: use cb instead of skb->network_headerRichard Gobert2024-05-131-2/+7
| | | | | | | | | | This patch converts references of skb->network_header to napi_gro_cb's network_offset and inner_network_offset. Signed-off-by: Richard Gobert <richardbgobert@gmail.com> Reviewed-by: Willem de Bruijn <willemb@google.com> Link: https://lore.kernel.org/r/20240509190819.2985-2-richardbgobert@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
* net: move skb_gro_receive_list from udp to coreFelix Fietkau2024-05-061-0/+1
| | | | | | | | | | | This helper function will be used for TCP fraglist GRO support Acked-by: Paolo Abeni <pabeni@redhat.com> Reviewed-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Felix Fietkau <nbd@nbd.name> Reviewed-by: David Ahern <dsahern@kernel.org> Reviewed-by: Willem de Bruijn <willemb@google.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com>
* net: gro: fix udp bad offset in socket lookup by adding ↵Richard Gobert2024-05-021-0/+9
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | {inner_}network_offset to napi_gro_cb Commits a602456 ("udp: Add GRO functions to UDP socket") and 57c67ff ("udp: additional GRO support") introduce incorrect usage of {ip,ipv6}_hdr in the complete phase of gro. 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. This patch adds network_offset and inner_network_offset to napi_gro_cb, and makes sure both are set correctly. To fix the issue, network_offsets union is used inside napi_gro_cb, in which both the outer and the inner network offsets are saved. 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 Fixes: a6024562ffd7 ("udp: Add GRO functions to UDP socket") Signed-off-by: Richard Gobert <richardbgobert@gmail.com> Reviewed-by: Eric Dumazet <edumazet@google.com> Reviewed-by: Willem de Bruijn <willemb@google.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com>
* net: gro: move two declarations to include/net/gro.hEric Dumazet2024-03-111-3/+6
| | | | | | | | | | | | | Move gro_find_receive_by_type() and gro_find_complete_by_type() to include/net/gro.h where they belong. Also use _NET_GRO_H instead of _NET_IPV6_GRO_H to protect include/net/gro.h from multiple inclusions. Signed-off-by: Eric Dumazet <edumazet@google.com> Reviewed-by: Simon Horman <horms@kernel.org> Link: https://lore.kernel.org/r/20240308102230.296224-1-edumazet@google.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
* net: introduce struct net_hotdataEric Dumazet2024-03-081-3/+2
| | | | | | | | | | | | | | | | | Instead of spreading networking critical fields all over the places, add a custom net_hotdata structure so that we can precisely control its layout. In this first patch, move : - gro_normal_batch used in rx (GRO stack) - offload_base used in rx and tx (GRO and TSO stacks) Signed-off-by: Eric Dumazet <edumazet@google.com> Acked-by: Soheil Hassas Yeganeh <soheil@google.com> Reviewed-by: David Ahern <dsahern@kernel.org> Link: https://lore.kernel.org/r/20240306160031.874438-2-edumazet@google.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
* net: gro: enable fast path for more casesEric Dumazet2024-03-051-1/+1
| | | | | | | | | | | | | | | | | | | | | | | Currently the so-called GRO fast path is only enabled for napi_frags_skb() callers. After the prior patch, we no longer have to clear frag0 whenever we pulled bytes to skb->head. We therefore can initialize frag0 to skb->data so that GRO fast path can be used in the following additional cases: - Drivers using header split (populating skb->data with headers, and having payload in one or more page fragments). - Drivers not using any page frag (entire packet is in skb->data) Add a likely() in skb_gro_may_pull() to help the compiler to generate better code if possible. Signed-off-by: Eric Dumazet <edumazet@google.com> Acked-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com>
* net: gro: change skb_gro_network_header()Eric Dumazet2024-03-051-15/+12
| | | | | | | | | | | | | | | Change skb_gro_network_header() to accept a const sk_buff and to no longer check if frag0 is NULL or not. This allows to remove skb_gro_frag0_invalidate() which is seen in profiles when header-split is enabled. sk_buff parameter is constified for skb_gro_header_fast(), inet_gro_compute_pseudo() and ip6_gro_compute_pseudo(). Signed-off-by: Eric Dumazet <edumazet@google.com> Acked-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com>
* net: gro: rename skb_gro_header_hard()Eric Dumazet2024-03-051-3/+4
| | | | | | | | | | | | | | | | | | | skb_gro_header_hard() is renamed to skb_gro_may_pull() to match the convention used by common helpers like pskb_may_pull(). This means the condition is inverted: if (skb_gro_header_hard(skb, hlen)) slow_path(); becomes: if (!skb_gro_may_pull(skb, hlen)) slow_path(); Signed-off-by: Eric Dumazet <edumazet@google.com> Acked-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com>
* xfrm: Support GRO for IPv4 ESP in UDP encapsulationSteffen Klassert2023-10-061-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch enables the GRO codepath for IPv4 ESP in UDP encapsulated packets. Decapsulation happens at L2 and saves a full round through the stack for each packet. This is also needed to support HW offload for ESP in UDP encapsulation. Enabling this would imporove performance for ESP in UDP datapath, i.e IPsec with NAT in between. By default GRP for ESP-in-UDP is disabled for UDP sockets. To enable this feature for an ESP socket, the following two options need to be set: 1. enable ESP-in-UDP: (this is already set by an IKE daemon). int type = UDP_ENCAP_ESPINUDP; setsockopt(fd, SOL_UDP, UDP_ENCAP, &type, sizeof(type)); 2. To enable GRO for ESP in UDP socket: type = true; setsockopt(fd, SOL_UDP, UDP_GRO, &type, sizeof(type)); Enabling ESP-in-UDP has the side effect of preventing the Linux stack from seeing ESP packets at the L3 (when ESP OFFLOAD is disabled), as packets are immediately decapsulated from UDP and decrypted. This change may affect nftable rules that match on ESP packets at L3. Also tcpdump won't see the ESP packet. Developers/admins are advised to review and adapt any nftable rules accordingly before enabling this feature to prevent potential rule breakage. Also tcpdump will not see from ESP packets from a ESP in UDP flow, when this is enabled. Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com> Co-developed-by: Antony Antony <antony.antony@secunet.com> Signed-off-by: Antony Antony <antony.antony@secunet.com> Reviewed-by: Eyal Birger <eyal.birger@gmail.com>
* net: gro: fix misuse of CB in udp socket lookupRichard Gobert2023-07-291-0/+43
| | | | | | | | | | | | | | This patch fixes a misuse of IP{6}CB(skb) in GRO, while calling to `udp6_lib_lookup2` when handling udp tunnels. `udp6_lib_lookup2` fetch the device from CB. The fix changes it to fetch the device from `skb->dev`. l3mdev case requires special attention since it has a master and a slave device. Fixes: a6024562ffd7 ("udp: Add GRO functions to UDP socket") Reported-by: Gal Pressman <gal@nvidia.com> Signed-off-by: Richard Gobert <richardbgobert@gmail.com> Reviewed-by: David Ahern <dsahern@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: move gso declarations and functions to their own filesEric Dumazet2023-06-101-0/+1
| | | | | | | | | | | Move declarations into include/net/gso.h and code into net/core/gso.c Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Stanislav Fomichev <sdf@google.com> Reviewed-by: Simon Horman <simon.horman@corigine.com> Reviewed-by: David Ahern <dsahern@kernel.org> Link: https://lore.kernel.org/r/20230608191738.3947077-1-edumazet@google.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
* gro: decrease size of CBRichard Gobert2023-06-061-10/+16
| | | | | | | | | | | | | | | | | | | | | | The GRO control block (NAPI_GRO_CB) is currently at its maximum size. This commit reduces its size by putting two groups of fields that are used only at different times into a union. Specifically, the fields frag0 and frag0_len are the fields that make up the frag0 optimisation mechanism, which is used during the initial parsing of the SKB. The fields last and age are used after the initial parsing, while the SKB is stored in the GRO list, waiting for other packets to arrive. There was one location in dev_gro_receive that modified the frag0 fields after setting last and age. I changed this accordingly without altering the code behaviour. Signed-off-by: Richard Gobert <richardbgobert@gmail.com> Reviewed-by: Eric Dumazet <edumazet@google.com> Link: https://lore.kernel.org/r/20230601161407.GA9253@debian Signed-off-by: Paolo Abeni <pabeni@redhat.com>
* Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/netJakub Kicinski2022-08-261-1/+1
|\ | | | | | | | | | | | | | | | | | | drivers/net/ethernet/mellanox/mlx5/core/en_fs.c 21234e3a84c7 ("net/mlx5e: Fix use after free in mlx5e_fs_init()") c7eafc5ed068 ("net/mlx5e: Convert ethtool_steering member of flow_steering struct to pointer") https://lore.kernel.org/all/20220825104410.67d4709c@canb.auug.org.au/ https://lore.kernel.org/all/20220823055533.334471-1-saeed@kernel.org/ Signed-off-by: Jakub Kicinski <kuba@kernel.org>
| * net: Fix a data-race around gro_normal_batch.Kuniyuki Iwashima2022-08-241-1/+1
| | | | | | | | | | | | | | | | | | | | While reading gro_normal_batch, it can be changed concurrently. Thus, we need to add READ_ONCE() to its reader. Fixes: 323ebb61e32b ("net: use listified RX for handling GRO_NORMAL skbs") Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com> Acked-by: Edward Cree <ecree.xilinx@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | net: gro: skb_gro_header helper functionRichard Gobert2022-08-251-15/+18
|/ | | | | | | | | | | | | | | | | | Introduce a simple helper function to replace a common pattern. When accessing the GRO header, we fetch the pointer from frag0, then test its validity and fetch it from the skb when necessary. This leads to the pattern skb_gro_header_fast -> skb_gro_header_hard -> skb_gro_header_slow recurring many times throughout GRO code. This patch replaces these patterns with a single inlined function call, improving code readability. Signed-off-by: Richard Gobert <richardbgobert@gmail.com> Reviewed-by: Eric Dumazet <edumazet@google.com> Link: https://lore.kernel.org/r/20220823071034.GA56142@debian Signed-off-by: Paolo Abeni <pabeni@redhat.com>
* net: gro: Fix a 'directive in macro's argument list' sparse warningGal Pressman2022-02-181-2/+3
| | | | | | | | | | | | | | | Following the cited commit, sparse started complaining about: ../include/net/gro.h:58:1: warning: directive in macro's argument list ../include/net/gro.h:59:1: warning: directive in macro's argument list Fix that by moving the defines out of the struct_group() macro. Fixes: de5a1f3ce4c8 ("net: gro: minor optimization for dev_gro_receive()") Reviewed-by: Maxim Mikityanskiy <maximmi@nvidia.com> Signed-off-by: Gal Pressman <gal@nvidia.com> Acked-by: Alexander Lobakin <alexandr.lobakin@intel.com> Acked-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: gro: minor optimization for dev_gro_receive()Paolo Abeni2022-02-051-24/+28
| | | | | | | | | | | | | | | | | | | | | | | | | | | | While inspecting some perf report, I noticed that the compiler emits suboptimal code for the napi CB initialization, fetching and storing multiple times the memory for flags bitfield. This is with gcc 10.3.1, but I observed the same with older compiler versions. We can help the compiler to do a nicer work clearing several fields at once using an u32 alias. The generated code is quite smaller, with the same number of conditional. Before: objdump -t net/core/gro.o | grep " F .text" 0000000000000bb0 l F .text 0000000000000357 dev_gro_receive After: 0000000000000bb0 l F .text 000000000000033c dev_gro_receive v1 -> v2: - use struct_group (Alexander and Alex) RFC -> v1: - use __struct_group to delimit the zeroed area (Alexander) Signed-off-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: fix recent csum changesEric Dumazet2021-12-071-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Vladimir reported csum issues after my recent change in skb_postpull_rcsum() Issue here is the following: initial skb->csum is the csum of [part to be pulled][rest of packet] Old code: skb->csum = csum_sub(skb->csum, csum_partial(pull, pull_length, 0)); New code: skb->csum = ~csum_partial(pull, pull_length, ~skb->csum); This is broken if the csum of [pulled part] happens to be equal to skb->csum, because end result of skb->csum is 0 in new code, instead of being 0xffffffff David Laight suggested to use skb->csum = -csum_partial(pull, pull_length, -skb->csum); I based my patches on existing code present in include/net/seg6.h, update_csum_diff4() and update_csum_diff16() which might need a similar fix. I guess that my tests, mostly pulling 40 bytes of IPv6 header were not providing enough entropy to hit this bug. v2: added wsum_negate() to make sparse happy. Fixes: 29c3002644bd ("net: optimize skb_postpull_rcsum()") Fixes: 0bd28476f636 ("gro: optimize skb_gro_postpull_rcsum()") Signed-off-by: Eric Dumazet <edumazet@google.com> Reported-by: Vladimir Oltean <vladimir.oltean@nxp.com> Suggested-by: David Laight <David.Laight@ACULAB.COM> Cc: David Lebrun <dlebrun@google.com> Tested-by: Vladimir Oltean <vladimir.oltean@nxp.com> Link: https://lore.kernel.org/r/20211204045356.3659278-1-eric.dumazet@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
* gro: optimize skb_gro_postpull_rcsum()Eric Dumazet2021-11-261-2/+2
| | | | | | | | | | | | | | | | | | | We can leverage third argument to csum_partial(): X = csum_sub(X, csum_partial(start, len, 0)); --> X = csum_add(X, ~csum_partial(start, len, 0)); --> X = ~csum_partial(start, len, ~X); This removes one add/adc pair and its dependency against the carry flag. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
* net: add missing include in include/net/gro.hEric Dumazet2021-11-171-0/+1
| | | | | | | | | | | | | This is needed for some arches, as reported by Geert Uytterhoeven, Randy Dunlap and Stephen Rothwell Fixes: 4721031c3559 ("net: move gro definitions to include/net/gro.h") Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Cc: Randy Dunlap <rdunlap@infradead.org> Tested-by: Geert Uytterhoeven <geert@linux-m68k.org> Link: https://lore.kernel.org/r/20211117100130.2368319-1-eric.dumazet@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
* net: gro: populate net/core/gro.cEric Dumazet2021-11-161-0/+22
| | | | | | | | | | | Move gro code and data from net/core/dev.c to net/core/gro.c to ease maintenance. gro_normal_list() and gro_normal_one() are inlined because they are called from both files. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: gro: move skb_gro_receive into net/core/gro.cEric Dumazet2021-11-161-0/+2
| | | | | | | | net/core/gro.c will contain all core gro functions, to shrink net/core/skbuff.c and net/core/dev.c Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: move gro definitions to include/net/gro.hEric Dumazet2021-11-161-2/+394
| | | | | | | | include/linux/netdevice.h became too big, move gro stuff into include/net/gro.h Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* gro: add combined call_gro_receive() + INDIRECT_CALL_INET() helperAlexander Lobakin2021-03-191-0/+8
| | | | | | | | | | | | | call_gro_receive() is used to limit GRO recursion, but it works only with callback pointers. There's a combined version of call_gro_receive() + INDIRECT_CALL_2() in <net/inet_common.h>, but it doesn't check for IPv6 modularity. Add a similar new helper to cover both of these. It can and will be used to avoid retpoline overhead when IP header lies behind another offloaded proto. Signed-off-by: Alexander Lobakin <alobakin@pm.me> Signed-off-by: David S. Miller <davem@davemloft.net>
* gro: make net/gro.h self-containedAlexander Lobakin2021-03-191-0/+5
| | | | | | | | | | | | | | | | | | | | | If some source file includes <net/gro.h>, but doesn't include <linux/indirect_call_wrapper.h>: In file included from net/8021q/vlan_core.c:7: ./include/net/gro.h:6:1: warning: data definition has no type or storage class 6 | INDIRECT_CALLABLE_DECLARE(struct sk_buff *ipv6_gro_receive(struct list_head *, | ^~~~~~~~~~~~~~~~~~~~~~~~~ ./include/net/gro.h:6:1: error: type defaults to ‘int’ in declaration of ‘INDIRECT_CALLABLE_DECLARE’ [-Werror=implicit-int] [...] Include <linux/indirect_call_wrapper.h> directly. It's small and won't pull lots of dependencies. Also add some incomplete struct declarations to be fully stacked. Fixes: 04f00ab2275f ("net/core: move gro function declarations to separate header ") Signed-off-by: Alexander Lobakin <alobakin@pm.me> Signed-off-by: David S. Miller <davem@davemloft.net>
* net/core: move gro function declarations to separate headerLeon Romanovsky2021-02-051-0/+12
Fir the following compilation warnings: 1031 | INDIRECT_CALLABLE_SCOPE void udp_v6_early_demux(struct sk_buff *skb) net/ipv6/ip6_offload.c:182:41: warning: no previous prototype for ‘ipv6_gro_receive’ [-Wmissing-prototypes] 182 | INDIRECT_CALLABLE_SCOPE struct sk_buff *ipv6_gro_receive(struct list_head *head, | ^~~~~~~~~~~~~~~~ net/ipv6/ip6_offload.c:320:29: warning: no previous prototype for ‘ipv6_gro_complete’ [-Wmissing-prototypes] 320 | INDIRECT_CALLABLE_SCOPE int ipv6_gro_complete(struct sk_buff *skb, int nhoff) | ^~~~~~~~~~~~~~~~~ net/ipv6/ip6_offload.c:182:41: warning: no previous prototype for ‘ipv6_gro_receive’ [-Wmissing-prototypes] 182 | INDIRECT_CALLABLE_SCOPE struct sk_buff *ipv6_gro_receive(struct list_head *head, | ^~~~~~~~~~~~~~~~ net/ipv6/ip6_offload.c:320:29: warning: no previous prototype for ‘ipv6_gro_complete’ [-Wmissing-prototypes] 320 | INDIRECT_CALLABLE_SCOPE int ipv6_gro_complete(struct sk_buff *skb, int nhoff) Signed-off-by: Leon Romanovsky <leonro@nvidia.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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