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Fri, 10 Apr 2026 11:10:32 -0400 (EDT) From: Alice Mikityanska To: Daniel Borkmann , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Xin Long , Willem de Bruijn , David Ahern , Nikolay Aleksandrov Cc: Shuah Khan , Stanislav Fomichev , Andrew Lunn , Simon Horman , Florian Westphal , netdev@vger.kernel.org, Alice Mikityanska Subject: [PATCH net-next v3 11/12] geneve: Enable BIG TCP packets Date: Fri, 10 Apr 2026 18:09:42 +0300 Message-ID: <20260410150943.993350-12-alice.kernel@fastmail.im> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260410150943.993350-1-alice.kernel@fastmail.im> References: <20260410150943.993350-1-alice.kernel@fastmail.im> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Alice Mikityanska From: Daniel Borkmann In Cilium we do support BIG TCP, but so far the latter has only been enabled for direct routing use-cases. A lot of users rely on Cilium with vxlan/geneve tunneling though. The underlying kernel infra for tunneling has not been supporting BIG TCP up to this point. Given we do now, bump tso_max_size for geneve netdevs up to GSO_MAX_SIZE to allow the admin to use BIG TCP with geneve tunnels. BIG TCP on geneve disabled: Standard MTU: # netperf -H 10.1.0.2 -t TCP_STREAM -l60 MIGRATED TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 10.1.0.2 () port 0 AF_INET : demo Recv Send Send Socket Socket Message Elapsed Size Size Size Time Throughput bytes bytes bytes secs. 10^6bits/sec 131072 16384 16384 30.00 37391.34 8k MTU: # netperf -H 10.1.0.2 -t TCP_STREAM -l60 MIGRATED TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 10.1.0.2 () port 0 AF_INET : demo Recv Send Send Socket Socket Message Elapsed Size Size Size Time Throughput bytes bytes bytes secs. 10^6bits/sec 262144 32768 32768 60.00 58030.19 BIG TCP on geneve enabled: Standard MTU: # netperf -H 10.1.0.2 -t TCP_STREAM -l60 MIGRATED TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 10.1.0.2 () port 0 AF_INET : demo Recv Send Send Socket Socket Message Elapsed Size Size Size Time Throughput bytes bytes bytes secs. 10^6bits/sec 131072 16384 16384 30.00 40891.57 8k MTU: # netperf -H 10.1.0.2 -t TCP_STREAM -l60 MIGRATED TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 10.1.0.2 () port 0 AF_INET : demo Recv Send Send Socket Socket Message Elapsed Size Size Size Time Throughput bytes bytes bytes secs. 10^6bits/sec 262144 32768 32768 60.00 61458.39 Example receive side: swapper 0 [008] 3682.509996: net:netif_receive_skb: dev=geneve0 skbaddr=0xffff8f3b0a781800 len=129492 ffffffff8cfe3aaa __netif_receive_skb_core.constprop.0+0x6ca ([kernel.kallsyms]) ffffffff8cfe3aaa __netif_receive_skb_core.constprop.0+0x6ca ([kernel.kallsyms]) ffffffff8cfe47dd __netif_receive_skb_list_core+0xed ([kernel.kallsyms]) ffffffff8cfe4e52 netif_receive_skb_list_internal+0x1d2 ([kernel.kallsyms]) ffffffff8cfe573c napi_complete_done+0x7c ([kernel.kallsyms]) ffffffff8d046c23 gro_cell_poll+0x83 ([kernel.kallsyms]) ffffffff8cfe586d __napi_poll+0x2d ([kernel.kallsyms]) ffffffff8cfe5f8d net_rx_action+0x20d ([kernel.kallsyms]) ffffffff8c35d252 handle_softirqs+0xe2 ([kernel.kallsyms]) ffffffff8c35d556 __irq_exit_rcu+0xd6 ([kernel.kallsyms]) ffffffff8c35d81e irq_exit_rcu+0xe ([kernel.kallsyms]) ffffffff8d2602b8 common_interrupt+0x98 ([kernel.kallsyms]) ffffffff8c000da7 asm_common_interrupt+0x27 ([kernel.kallsyms]) ffffffff8d2645c5 cpuidle_enter_state+0xd5 ([kernel.kallsyms]) ffffffff8cf6358e cpuidle_enter+0x2e ([kernel.kallsyms]) ffffffff8c3ba932 call_cpuidle+0x22 ([kernel.kallsyms]) ffffffff8c3bfb5e do_idle+0x1ce ([kernel.kallsyms]) ffffffff8c3bfd79 cpu_startup_entry+0x29 ([kernel.kallsyms]) ffffffff8c30a6c2 start_secondary+0x112 ([kernel.kallsyms]) ffffffff8c2c142d common_startup_64+0x13e ([kernel.kallsyms]) Example transmit side: swapper 0 [002] 3403.688687: net:net_dev_xmit: dev=enp10s0f0np0 skbaddr=0xffff8af31d104ae8 len=129556 rc=0 ffffffffa75e19c3 dev_hard_start_xmit+0x173 ([kernel.kallsyms]) ffffffffa75e19c3 dev_hard_start_xmit+0x173 ([kernel.kallsyms]) ffffffffa7653823 sch_direct_xmit+0x143 ([kernel.kallsyms]) ffffffffa75e2780 __dev_queue_xmit+0xc70 ([kernel.kallsyms]) ffffffffa76a1205 ip_finish_output2+0x265 ([kernel.kallsyms]) ffffffffa76a1577 __ip_finish_output+0x87 ([kernel.kallsyms]) ffffffffa76a165b ip_finish_output+0x2b ([kernel.kallsyms]) ffffffffa76a179e ip_output+0x5e ([kernel.kallsyms]) ffffffffa76a19d5 ip_local_out+0x35 ([kernel.kallsyms]) ffffffffa770d0e5 iptunnel_xmit+0x185 ([kernel.kallsyms]) ffffffffc179634e nf_nat_used_tuple_new.cold+0x1129 ([kernel.kallsyms]) ffffffffc179d3e0 geneve_xmit+0x920 ([kernel.kallsyms]) ffffffffa75e18af dev_hard_start_xmit+0x5f ([kernel.kallsyms]) ffffffffa75e1d3f __dev_queue_xmit+0x22f ([kernel.kallsyms]) ffffffffa76a1205 ip_finish_output2+0x265 ([kernel.kallsyms]) ffffffffa76a1577 __ip_finish_output+0x87 ([kernel.kallsyms]) ffffffffa76a165b ip_finish_output+0x2b ([kernel.kallsyms]) ffffffffa76a179e ip_output+0x5e ([kernel.kallsyms]) ffffffffa76a1de2 __ip_queue_xmit+0x1b2 ([kernel.kallsyms]) ffffffffa76a2135 ip_queue_xmit+0x15 ([kernel.kallsyms]) ffffffffa76c70a2 __tcp_transmit_skb+0x522 ([kernel.kallsyms]) ffffffffa76c931a tcp_write_xmit+0x65a ([kernel.kallsyms]) ffffffffa76ca3b9 __tcp_push_pending_frames+0x39 ([kernel.kallsyms]) ffffffffa76c1fb6 tcp_rcv_established+0x276 ([kernel.kallsyms]) ffffffffa76d3957 tcp_v4_do_rcv+0x157 ([kernel.kallsyms]) ffffffffa76d6053 tcp_v4_rcv+0x1243 ([kernel.kallsyms]) ffffffffa769b8ea ip_protocol_deliver_rcu+0x2a ([kernel.kallsyms]) ffffffffa769bab7 ip_local_deliver_finish+0x77 ([kernel.kallsyms]) ffffffffa769bb4d ip_local_deliver+0x6d ([kernel.kallsyms]) ffffffffa769abe7 ip_sublist_rcv_finish+0x37 ([kernel.kallsyms]) ffffffffa769b713 ip_sublist_rcv+0x173 ([kernel.kallsyms]) ffffffffa769bde2 ip_list_rcv+0x102 ([kernel.kallsyms]) ffffffffa75e4868 __netif_receive_skb_list_core+0x178 ([kernel.kallsyms]) ffffffffa75e4e52 netif_receive_skb_list_internal+0x1d2 ([kernel.kallsyms]) ffffffffa75e573c napi_complete_done+0x7c ([kernel.kallsyms]) ffffffffa7646c23 gro_cell_poll+0x83 ([kernel.kallsyms]) ffffffffa75e586d __napi_poll+0x2d ([kernel.kallsyms]) ffffffffa75e5f8d net_rx_action+0x20d ([kernel.kallsyms]) ffffffffa695d252 handle_softirqs+0xe2 ([kernel.kallsyms]) ffffffffa695d556 __irq_exit_rcu+0xd6 ([kernel.kallsyms]) ffffffffa695d81e irq_exit_rcu+0xe ([kernel.kallsyms]) ffffffffa78602b8 common_interrupt+0x98 ([kernel.kallsyms]) ffffffffa6600da7 asm_common_interrupt+0x27 ([kernel.kallsyms]) ffffffffa78645c5 cpuidle_enter_state+0xd5 ([kernel.kallsyms]) ffffffffa756358e cpuidle_enter+0x2e ([kernel.kallsyms]) ffffffffa69ba932 call_cpuidle+0x22 ([kernel.kallsyms]) ffffffffa69bfb5e do_idle+0x1ce ([kernel.kallsyms]) ffffffffa69bfd79 cpu_startup_entry+0x29 ([kernel.kallsyms]) ffffffffa690a6c2 start_secondary+0x112 ([kernel.kallsyms]) ffffffffa68c142d common_startup_64+0x13e ([kernel.kallsyms]) Signed-off-by: Daniel Borkmann Co-developed-by: Alice Mikityanska Signed-off-by: Alice Mikityanska Cc: Nikolay Aleksandrov --- drivers/net/geneve.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/net/geneve.c b/drivers/net/geneve.c index dc3a405e0e0c..63412e186a12 100644 --- a/drivers/net/geneve.c +++ b/drivers/net/geneve.c @@ -1699,6 +1699,8 @@ static void geneve_setup(struct net_device *dev) dev->max_mtu = IP_MAX_MTU - GENEVE_BASE_HLEN - dev->hard_header_len; netif_keep_dst(dev); + netif_set_tso_max_size(dev, GSO_MAX_SIZE); + dev->priv_flags &= ~IFF_TX_SKB_SHARING; dev->priv_flags |= IFF_LIVE_ADDR_CHANGE | IFF_NO_QUEUE; dev->lltx = true; -- 2.53.0