wireguard-linux/net, branch devel

net/sched: speedup tc_dump_qdisc() when tcm_handle is provided

2026-05-05T02:32:19Z

"tc qdisc show ... handle xxx" filtering can be done by the kernel. A followup patch can do the same for tcm_parent. iproute2/tc needs a small companion patch. Signed-off-by: Eric Dumazet Reviewed-by: Jamal Hadi Salim Link: https://patch.msgid.link/20260503114515.2460477-1-edumazet@google.com Signed-off-by: Jakub Kicinski

ipv6: mld: encode multicast exponential fields

2026-05-05T02:09:41Z

In MLD, MRC and QQIC fields are not correctly encoded when generating query packets. Since the receiver of the query interprets these fields using the MLDv2 floating-point decoding logic, any value that exceeds the linear threshold is incorrectly parsed as an exponential value, leading to an incorrect interval calculation. Encode and assign the corresponding protocol fields during query generation. Introduce the logic to dynamically calculate the exponent and mantissa using bit-scan (fls). This ensures MRC (16-bit) and QQIC (8-bit) fields are properly encoded when transmitting query packets with intervals that exceed their respective linear thresholds (32768 for MRD; 128 for QQI). RFC3810: If Maximum Response Code >= 32768, the Maximum Response Code field represents a floating-point value as follows: 0 1 2 3 4 5 6 7 8 9 A B C D E F +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |1| exp | mant | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ RFC3810: If QQIC >= 128, the QQIC field represents a floating-point value as follows: 0 1 2 3 4 5 6 7 +-+-+-+-+-+-+-+-+ |1| exp | mant | +-+-+-+-+-+-+-+-+ Reviewed-by: Nikolay Aleksandrov Reviewed-by: Ido Schimmel Signed-off-by: Ujjal Roy Link: https://patch.msgid.link/20260502131907.987-5-royujjal@gmail.com Signed-off-by: Jakub Kicinski

ipv4: igmp: encode multicast exponential fields

2026-05-05T02:09:41Z

In IGMP, MRC and QQIC fields are not correctly encoded when generating query packets. Since the receiver of the query interprets these fields using the IGMPv3 floating- point decoding logic, any value that exceeds the linear threshold is incorrectly parsed as an exponential value, leading to an incorrect interval calculation. Encode and assign the corresponding protocol fields during query generation. Introduce the logic to dynamically calculate the exponent and mantissa using bit-scan (fls). This ensures MRC and QQIC fields (8-bit) are properly encoded when transmitting query packets with intervals that exceed their respective linear threshold value of 128 (for MRT/QQI). RFC3376: for both MRC and QQIC, values >= 128 represent the same floating-point encoding as follows: 0 1 2 3 4 5 6 7 +-+-+-+-+-+-+-+-+ |1| exp | mant | +-+-+-+-+-+-+-+-+ Reviewed-by: Nikolay Aleksandrov Reviewed-by: Ido Schimmel Signed-off-by: Ujjal Roy Link: https://patch.msgid.link/20260502131907.987-4-royujjal@gmail.com Signed-off-by: Jakub Kicinski

ipv6: mld: rename mldv2_mrc() and add mldv2_qqi()

2026-05-05T02:09:41Z

Rename mldv2_mrc() to mldv2_mrd() as it is used to calculate the Maximum Response Delay from the Maximum Response Code. Introduce a new API mldv2_qqi() to define the existing calculation logic of QQI from QQIC. This also organizes the existing mld_update_qi() API. Reviewed-by: Nikolay Aleksandrov Reviewed-by: Ido Schimmel Signed-off-by: Ujjal Roy Link: https://patch.msgid.link/20260502131907.987-3-royujjal@gmail.com Signed-off-by: Jakub Kicinski

ipv4: igmp: get rid of IGMPV3_{QQIC,MRC} and simplify calculation

2026-05-05T02:09:41Z

Get rid of the IGMPV3_MRC macro and use the igmpv3_mrt() API to calculate the Max Resp Time from the Maximum Response Code. Similarly, for IGMPV3_QQIC, use the igmpv3_qqi() API to calculate the Querier's Query Interval from the QQIC field. Reviewed-by: Nikolay Aleksandrov Reviewed-by: Ido Schimmel Signed-off-by: Ujjal Roy Link: https://patch.msgid.link/20260502131907.987-2-royujjal@gmail.com Signed-off-by: Jakub Kicinski

vsock: convert to getsockopt_iter

2026-05-05T02:02:30Z

Convert AF_VSOCK's getsockopt implementation to use the new getsockopt_iter callback with sockopt_t. The single vsock_connectible_getsockopt() callback is shared by both vsock_stream_ops and vsock_seqpacket_ops, so both proto_ops are updated to use .getsockopt_iter. Key changes: - Replace (char __user *optval, int __user *optlen) with sockopt_t *opt - Use opt->optlen for buffer length (input) and returned size (output) - Use copy_to_iter() instead of put_user()/copy_to_user() Signed-off-by: Breno Leitao Reviewed-by: Bobby Eshleman Acked-by: Stanislav Fomichev Link: https://patch.msgid.link/20260501-getsock_one-v1-2-810ce23ea70e@debian.org Signed-off-by: Jakub Kicinski

netlink: convert to getsockopt_iter

2026-05-05T02:02:30Z

Convert AF_NETLINK's getsockopt implementation to use the new getsockopt_iter callback with sockopt_t. Key changes: - Replace (char __user *optval, int __user *optlen) with sockopt_t *opt - Use opt->optlen for buffer length (input) and returned size (output) - Use copy_to_iter() instead of put_user()/copy_to_user() - For NETLINK_LIST_MEMBERSHIPS: walk the groups bitmap and emit each u32 sequentially via copy_to_iter(), then set opt->optlen to the total size required (ALIGN(BITS_TO_BYTES(ngroups), sizeof(u32))). The wrapper writes opt->optlen back to userspace even on partial failure, preserving the existing API that lets userspace discover the needed allocation size. Signed-off-by: Breno Leitao Acked-by: Stanislav Fomichev Link: https://patch.msgid.link/20260501-getsock_one-v1-1-810ce23ea70e@debian.org Signed-off-by: Jakub Kicinski

net/sched: add qstats_cpu_drop_inc() helper

2026-05-05T01:59:07Z

1) Using this_cpu_inc() is better than going through this_cpu_ptr(): - Single instruction on x86. - Store tearing prevention. 2) Change tcf_action_update_stats() to use this_cpu_add(). 3) Add WRITE_ONCE() to __qdisc_qstats_drop() and qstats_drop_inc() in preparation for lockless "tc qdisc show". $ scripts/bloat-o-meter -t vmlinux.old vmlinux.new add/remove: 0/0 grow/shrink: 3/17 up/down: 72/-216 (-144) Function old new delta dualpi2_enqueue_skb 462 511 +49 tcf_ife_act 1061 1077 +16 taprio_enqueue 613 620 +7 codel_qdisc_enqueue 149 143 -6 tcf_vlan_act 684 676 -8 tcf_skbedit_act 626 618 -8 tcf_police_act 725 717 -8 tcf_mpls_act 1297 1289 -8 tcf_gate_act 310 302 -8 tcf_gact_act 222 214 -8 tcf_csum_act 2438 2430 -8 tcf_bpf_act 709 701 -8 tcf_action_update_stats 124 115 -9 pie_qdisc_enqueue 865 856 -9 pfifo_enqueue 116 107 -9 choke_enqueue 2069 2059 -10 plug_enqueue 139 128 -11 bfifo_enqueue 121 110 -11 tcf_nat_act 1501 1489 -12 gred_enqueue 1743 1668 -75 Total: Before=24388609, After=24388465, chg -0.00% Signed-off-by: Eric Dumazet Reviewed-by: Jamal Hadi Salim Link: https://patch.msgid.link/20260501135916.2566766-1-edumazet@google.com Signed-off-by: Jakub Kicinski

net/sched: taprio: prepare taprio_dump() for RTNL removal

2026-05-05T01:33:06Z

We soon will no longer hold RTNL in qdisc dumps. Add READ_ONCE()/WRITE_ONCE() annotations. Note: taprio already uses RCU to protect most of its fields. Signed-off-by: Eric Dumazet Link: https://patch.msgid.link/20260501064247.2027688-1-edumazet@google.com Signed-off-by: Jakub Kicinski

net: dsa: pass extack to dsa_switch_ops :: port_policer_add()

2026-05-02T17:38:57Z

Drivers might have error messages to propagate to user space. Propagate the netlink extack so that they can inform user space in a verbal way of their limitations. Make the according transformations to the two users (sja1105 and felix). Signed-off-by: David Yang Reviewed-by: Andrew Lunn Link: https://patch.msgid.link/20260430114529.3536911-2-mmyangfl@gmail.com Signed-off-by: Jakub Kicinski