From 5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Tue, 21 Feb 2023 18:24:12 -0800 Subject: Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next Pull networking updates from Jakub Kicinski: "Core: - Add dedicated kmem_cache for typical/small skb->head, avoid having to access struct page at kfree time, and improve memory use. - Introduce sysctl to set default RPS configuration for new netdevs. - Define Netlink protocol specification format which can be used to describe messages used by each family and auto-generate parsers. Add tools for generating kernel data structures and uAPI headers. - Expose all net/core sysctls inside netns. - Remove 4s sleep in netpoll if carrier is instantly detected on boot. - Add configurable limit of MDB entries per port, and port-vlan. - Continue populating drop reasons throughout the stack. - Retire a handful of legacy Qdiscs and classifiers. Protocols: - Support IPv4 big TCP (TSO frames larger than 64kB). - Add IP_LOCAL_PORT_RANGE socket option, to control local port range on socket by socket basis. - Track and report in procfs number of MPTCP sockets used. - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path manager. - IPv6: don't check net.ipv6.route.max_size and rely on garbage collection to free memory (similarly to IPv4). - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986). - ICMP: add per-rate limit counters. - Add support for user scanning requests in ieee802154. - Remove static WEP support. - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate reporting. - WiFi 7 EHT channel puncturing support (client & AP). BPF: - Add a rbtree data structure following the "next-gen data structure" precedent set by recently added linked list, that is, by using kfunc + kptr instead of adding a new BPF map type. - Expose XDP hints via kfuncs with initial support for RX hash and timestamp metadata. - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to better support decap on GRE tunnel devices not operating in collect metadata. - Improve x86 JIT's codegen for PROBE_MEM runtime error checks. - Remove the need for trace_printk_lock for bpf_trace_printk and bpf_trace_vprintk helpers. - Extend libbpf's bpf_tracing.h support for tracing arguments of kprobes/uprobes and syscall as a special case. - Significantly reduce the search time for module symbols by livepatch and BPF. - Enable cpumasks to be used as kptrs, which is useful for tracing programs tracking which tasks end up running on which CPUs in different time intervals. - Add support for BPF trampoline on s390x and riscv64. - Add capability to export the XDP features supported by the NIC. - Add __bpf_kfunc tag for marking kernel functions as kfuncs. - Add cgroup.memory=nobpf kernel parameter option to disable BPF memory accounting for container environments. Netfilter: - Remove the CLUSTERIP target. It has been marked as obsolete for years, and we still have WARN splats wrt races of the out-of-band /proc interface installed by this target. - Add 'destroy' commands to nf_tables. They are identical to the existing 'delete' commands, but do not return an error if the referenced object (set, chain, rule...) did not exist. Driver API: - Improve cpumask_local_spread() locality to help NICs set the right IRQ affinity on AMD platforms. - Separate C22 and C45 MDIO bus transactions more clearly. - Introduce new DCB table to control DSCP rewrite on egress. - Support configuration of Physical Layer Collision Avoidance (PLCA) Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of shared medium Ethernet. - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing preemption of low priority frames by high priority frames. - Add support for controlling MACSec offload using netlink SET. - Rework devlink instance refcounts to allow registration and de-registration under the instance lock. Split the code into multiple files, drop some of the unnecessarily granular locks and factor out common parts of netlink operation handling. - Add TX frame aggregation parameters (for USB drivers). - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning messages with notifications for debug. - Allow offloading of UDP NEW connections via act_ct. - Add support for per action HW stats in TC. - Support hardware miss to TC action (continue processing in SW from a specific point in the action chain). - Warn if old Wireless Extension user space interface is used with modern cfg80211/mac80211 drivers. Do not support Wireless Extensions for Wi-Fi 7 devices at all. Everyone should switch to using nl80211 interface instead. - Improve the CAN bit timing configuration. Use extack to return error messages directly to user space, update the SJW handling, including the definition of a new default value that will benefit CAN-FD controllers, by increasing their oscillator tolerance. New hardware / drivers: - Ethernet: - nVidia BlueField-3 support (control traffic driver) - Ethernet support for imx93 SoCs - Motorcomm yt8531 gigabit Ethernet PHY - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA) - Microchip LAN8841 PHY (incl. cable diagnostics and PTP) - Amlogic gxl MDIO mux - WiFi: - RealTek RTL8188EU (rtl8xxxu) - Qualcomm Wi-Fi 7 devices (ath12k) - CAN: - Renesas R-Car V4H Drivers: - Bluetooth: - Set Per Platform Antenna Gain (PPAG) for Intel controllers. - Ethernet NICs: - Intel (1G, igc): - support TSN / Qbv / packet scheduling features of i226 model - Intel (100G, ice): - use GNSS subsystem instead of TTY - multi-buffer XDP support - extend support for GPIO pins to E823 devices - nVidia/Mellanox: - update the shared buffer configuration on PFC commands - implement PTP adjphase function for HW offset control - TC support for Geneve and GRE with VF tunnel offload - more efficient crypto key management method - multi-port eswitch support - Netronome/Corigine: - add DCB IEEE support - support IPsec offloading for NFP3800 - Freescale/NXP (enetc): - support XDP_REDIRECT for XDP non-linear buffers - improve reconfig, avoid link flap and waiting for idle - support MAC Merge layer - Other NICs: - sfc/ef100: add basic devlink support for ef100 - ionic: rx_push mode operation (writing descriptors via MMIO) - bnxt: use the auxiliary bus abstraction for RDMA - r8169: disable ASPM and reset bus in case of tx timeout - cpsw: support QSGMII mode for J721e CPSW9G - cpts: support pulse-per-second output - ngbe: add an mdio bus driver - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing - r8152: handle devices with FW with NCM support - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation - virtio-net: support multi buffer XDP - virtio/vsock: replace virtio_vsock_pkt with sk_buff - tsnep: XDP support - Ethernet high-speed switches: - nVidia/Mellanox (mlxsw): - add support for latency TLV (in FW control messages) - Microchip (sparx5): - separate explicit and implicit traffic forwarding rules, make the implicit rules always active - add support for egress DSCP rewrite - IS0 VCAP support (Ingress Classification) - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS etc.) - ES2 VCAP support (Egress Access Control) - support for Per-Stream Filtering and Policing (802.1Q, 8.6.5.1) - Ethernet embedded switches: - Marvell (mv88e6xxx): - add MAB (port auth) offload support - enable PTP receive for mv88e6390 - NXP (ocelot): - support MAC Merge layer - support for the the vsc7512 internal copper phys - Microchip: - lan9303: convert to PHYLINK - lan966x: support TC flower filter statistics - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x - lan937x: support Credit Based Shaper configuration - ksz9477: support Energy Efficient Ethernet - other: - qca8k: convert to regmap read/write API, use bulk operations - rswitch: Improve TX timestamp accuracy - Intel WiFi (iwlwifi): - EHT (Wi-Fi 7) rate reporting - STEP equalizer support: transfer some STEP (connection to radio on platforms with integrated wifi) related parameters from the BIOS to the firmware. - Qualcomm 802.11ax WiFi (ath11k): - IPQ5018 support - Fine Timing Measurement (FTM) responder role support - channel 177 support - MediaTek WiFi (mt76): - per-PHY LED support - mt7996: EHT (Wi-Fi 7) support - Wireless Ethernet Dispatch (WED) reset support - switch to using page pool allocator - RealTek WiFi (rtw89): - support new version of Bluetooth co-existance - Mobile: - rmnet: support TX aggregation" * tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits) page_pool: add a comment explaining the fragment counter usage net: ethtool: fix __ethtool_dev_mm_supported() implementation ethtool: pse-pd: Fix double word in comments xsk: add linux/vmalloc.h to xsk.c sefltests: netdevsim: wait for devlink instance after netns removal selftest: fib_tests: Always cleanup before exit net/mlx5e: Align IPsec ASO result memory to be as required by hardware net/mlx5e: TC, Set CT miss to the specific ct action instance net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG net/mlx5: Refactor tc miss handling to a single function net/mlx5: Kconfig: Make tc offload depend on tc skb extension net/sched: flower: Support hardware miss to tc action net/sched: flower: Move filter handle initialization earlier net/sched: cls_api: Support hardware miss to tc action net/sched: Rename user cookie and act cookie sfc: fix builds without CONFIG_RTC_LIB sfc: clean up some inconsistent indentings net/mlx4_en: Introduce flexible array to silence overflow warning net: lan966x: Fix possible deadlock inside PTP net/ulp: Remove redundant ->clone() test in inet_clone_ulp(). ... --- net/core/gen_stats.c | 485 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 485 insertions(+) create mode 100644 net/core/gen_stats.c (limited to 'net/core/gen_stats.c') diff --git a/net/core/gen_stats.c b/net/core/gen_stats.c new file mode 100644 index 000000000..b71ccaec0 --- /dev/null +++ b/net/core/gen_stats.c @@ -0,0 +1,485 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * net/core/gen_stats.c + * + * Authors: Thomas Graf + * Jamal Hadi Salim + * Alexey Kuznetsov, + * + * See Documentation/networking/gen_stats.rst + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +static inline int +gnet_stats_copy(struct gnet_dump *d, int type, void *buf, int size, int padattr) +{ + if (nla_put_64bit(d->skb, type, size, buf, padattr)) + goto nla_put_failure; + return 0; + +nla_put_failure: + if (d->lock) + spin_unlock_bh(d->lock); + kfree(d->xstats); + d->xstats = NULL; + d->xstats_len = 0; + return -1; +} + +/** + * gnet_stats_start_copy_compat - start dumping procedure in compatibility mode + * @skb: socket buffer to put statistics TLVs into + * @type: TLV type for top level statistic TLV + * @tc_stats_type: TLV type for backward compatibility struct tc_stats TLV + * @xstats_type: TLV type for backward compatibility xstats TLV + * @lock: statistics lock + * @d: dumping handle + * @padattr: padding attribute + * + * Initializes the dumping handle, grabs the statistic lock and appends + * an empty TLV header to the socket buffer for use a container for all + * other statistic TLVS. + * + * The dumping handle is marked to be in backward compatibility mode telling + * all gnet_stats_copy_XXX() functions to fill a local copy of struct tc_stats. + * + * Returns 0 on success or -1 if the room in the socket buffer was not sufficient. + */ +int +gnet_stats_start_copy_compat(struct sk_buff *skb, int type, int tc_stats_type, + int xstats_type, spinlock_t *lock, + struct gnet_dump *d, int padattr) + __acquires(lock) +{ + memset(d, 0, sizeof(*d)); + + if (type) + d->tail = (struct nlattr *)skb_tail_pointer(skb); + d->skb = skb; + d->compat_tc_stats = tc_stats_type; + d->compat_xstats = xstats_type; + d->padattr = padattr; + if (lock) { + d->lock = lock; + spin_lock_bh(lock); + } + if (d->tail) { + int ret = gnet_stats_copy(d, type, NULL, 0, padattr); + + /* The initial attribute added in gnet_stats_copy() may be + * preceded by a padding attribute, in which case d->tail will + * end up pointing at the padding instead of the real attribute. + * Fix this so gnet_stats_finish_copy() adjusts the length of + * the right attribute. + */ + if (ret == 0 && d->tail->nla_type == padattr) + d->tail = (struct nlattr *)((char *)d->tail + + NLA_ALIGN(d->tail->nla_len)); + return ret; + } + + return 0; +} +EXPORT_SYMBOL(gnet_stats_start_copy_compat); + +/** + * gnet_stats_start_copy - start dumping procedure in compatibility mode + * @skb: socket buffer to put statistics TLVs into + * @type: TLV type for top level statistic TLV + * @lock: statistics lock + * @d: dumping handle + * @padattr: padding attribute + * + * Initializes the dumping handle, grabs the statistic lock and appends + * an empty TLV header to the socket buffer for use a container for all + * other statistic TLVS. + * + * Returns 0 on success or -1 if the room in the socket buffer was not sufficient. + */ +int +gnet_stats_start_copy(struct sk_buff *skb, int type, spinlock_t *lock, + struct gnet_dump *d, int padattr) +{ + return gnet_stats_start_copy_compat(skb, type, 0, 0, lock, d, padattr); +} +EXPORT_SYMBOL(gnet_stats_start_copy); + +/* Must not be inlined, due to u64_stats seqcount_t lockdep key */ +void gnet_stats_basic_sync_init(struct gnet_stats_basic_sync *b) +{ + u64_stats_set(&b->bytes, 0); + u64_stats_set(&b->packets, 0); + u64_stats_init(&b->syncp); +} +EXPORT_SYMBOL(gnet_stats_basic_sync_init); + +static void gnet_stats_add_basic_cpu(struct gnet_stats_basic_sync *bstats, + struct gnet_stats_basic_sync __percpu *cpu) +{ + u64 t_bytes = 0, t_packets = 0; + int i; + + for_each_possible_cpu(i) { + struct gnet_stats_basic_sync *bcpu = per_cpu_ptr(cpu, i); + unsigned int start; + u64 bytes, packets; + + do { + start = u64_stats_fetch_begin(&bcpu->syncp); + bytes = u64_stats_read(&bcpu->bytes); + packets = u64_stats_read(&bcpu->packets); + } while (u64_stats_fetch_retry(&bcpu->syncp, start)); + + t_bytes += bytes; + t_packets += packets; + } + _bstats_update(bstats, t_bytes, t_packets); +} + +void gnet_stats_add_basic(struct gnet_stats_basic_sync *bstats, + struct gnet_stats_basic_sync __percpu *cpu, + struct gnet_stats_basic_sync *b, bool running) +{ + unsigned int start; + u64 bytes = 0; + u64 packets = 0; + + WARN_ON_ONCE((cpu || running) && in_hardirq()); + + if (cpu) { + gnet_stats_add_basic_cpu(bstats, cpu); + return; + } + do { + if (running) + start = u64_stats_fetch_begin(&b->syncp); + bytes = u64_stats_read(&b->bytes); + packets = u64_stats_read(&b->packets); + } while (running && u64_stats_fetch_retry(&b->syncp, start)); + + _bstats_update(bstats, bytes, packets); +} +EXPORT_SYMBOL(gnet_stats_add_basic); + +static void gnet_stats_read_basic(u64 *ret_bytes, u64 *ret_packets, + struct gnet_stats_basic_sync __percpu *cpu, + struct gnet_stats_basic_sync *b, bool running) +{ + unsigned int start; + + if (cpu) { + u64 t_bytes = 0, t_packets = 0; + int i; + + for_each_possible_cpu(i) { + struct gnet_stats_basic_sync *bcpu = per_cpu_ptr(cpu, i); + unsigned int start; + u64 bytes, packets; + + do { + start = u64_stats_fetch_begin(&bcpu->syncp); + bytes = u64_stats_read(&bcpu->bytes); + packets = u64_stats_read(&bcpu->packets); + } while (u64_stats_fetch_retry(&bcpu->syncp, start)); + + t_bytes += bytes; + t_packets += packets; + } + *ret_bytes = t_bytes; + *ret_packets = t_packets; + return; + } + do { + if (running) + start = u64_stats_fetch_begin(&b->syncp); + *ret_bytes = u64_stats_read(&b->bytes); + *ret_packets = u64_stats_read(&b->packets); + } while (running && u64_stats_fetch_retry(&b->syncp, start)); +} + +static int +___gnet_stats_copy_basic(struct gnet_dump *d, + struct gnet_stats_basic_sync __percpu *cpu, + struct gnet_stats_basic_sync *b, + int type, bool running) +{ + u64 bstats_bytes, bstats_packets; + + gnet_stats_read_basic(&bstats_bytes, &bstats_packets, cpu, b, running); + + if (d->compat_tc_stats && type == TCA_STATS_BASIC) { + d->tc_stats.bytes = bstats_bytes; + d->tc_stats.packets = bstats_packets; + } + + if (d->tail) { + struct gnet_stats_basic sb; + int res; + + memset(&sb, 0, sizeof(sb)); + sb.bytes = bstats_bytes; + sb.packets = bstats_packets; + res = gnet_stats_copy(d, type, &sb, sizeof(sb), TCA_STATS_PAD); + if (res < 0 || sb.packets == bstats_packets) + return res; + /* emit 64bit stats only if needed */ + return gnet_stats_copy(d, TCA_STATS_PKT64, &bstats_packets, + sizeof(bstats_packets), TCA_STATS_PAD); + } + return 0; +} + +/** + * gnet_stats_copy_basic - copy basic statistics into statistic TLV + * @d: dumping handle + * @cpu: copy statistic per cpu + * @b: basic statistics + * @running: true if @b represents a running qdisc, thus @b's + * internal values might change during basic reads. + * Only used if @cpu is NULL + * + * Context: task; must not be run from IRQ or BH contexts + * + * Appends the basic statistics to the top level TLV created by + * gnet_stats_start_copy(). + * + * Returns 0 on success or -1 with the statistic lock released + * if the room in the socket buffer was not sufficient. + */ +int +gnet_stats_copy_basic(struct gnet_dump *d, + struct gnet_stats_basic_sync __percpu *cpu, + struct gnet_stats_basic_sync *b, + bool running) +{ + return ___gnet_stats_copy_basic(d, cpu, b, TCA_STATS_BASIC, running); +} +EXPORT_SYMBOL(gnet_stats_copy_basic); + +/** + * gnet_stats_copy_basic_hw - copy basic hw statistics into statistic TLV + * @d: dumping handle + * @cpu: copy statistic per cpu + * @b: basic statistics + * @running: true if @b represents a running qdisc, thus @b's + * internal values might change during basic reads. + * Only used if @cpu is NULL + * + * Context: task; must not be run from IRQ or BH contexts + * + * Appends the basic statistics to the top level TLV created by + * gnet_stats_start_copy(). + * + * Returns 0 on success or -1 with the statistic lock released + * if the room in the socket buffer was not sufficient. + */ +int +gnet_stats_copy_basic_hw(struct gnet_dump *d, + struct gnet_stats_basic_sync __percpu *cpu, + struct gnet_stats_basic_sync *b, + bool running) +{ + return ___gnet_stats_copy_basic(d, cpu, b, TCA_STATS_BASIC_HW, running); +} +EXPORT_SYMBOL(gnet_stats_copy_basic_hw); + +/** + * gnet_stats_copy_rate_est - copy rate estimator statistics into statistics TLV + * @d: dumping handle + * @rate_est: rate estimator + * + * Appends the rate estimator statistics to the top level TLV created by + * gnet_stats_start_copy(). + * + * Returns 0 on success or -1 with the statistic lock released + * if the room in the socket buffer was not sufficient. + */ +int +gnet_stats_copy_rate_est(struct gnet_dump *d, + struct net_rate_estimator __rcu **rate_est) +{ + struct gnet_stats_rate_est64 sample; + struct gnet_stats_rate_est est; + int res; + + if (!gen_estimator_read(rate_est, &sample)) + return 0; + est.bps = min_t(u64, UINT_MAX, sample.bps); + /* we have some time before reaching 2^32 packets per second */ + est.pps = sample.pps; + + if (d->compat_tc_stats) { + d->tc_stats.bps = est.bps; + d->tc_stats.pps = est.pps; + } + + if (d->tail) { + res = gnet_stats_copy(d, TCA_STATS_RATE_EST, &est, sizeof(est), + TCA_STATS_PAD); + if (res < 0 || est.bps == sample.bps) + return res; + /* emit 64bit stats only if needed */ + return gnet_stats_copy(d, TCA_STATS_RATE_EST64, &sample, + sizeof(sample), TCA_STATS_PAD); + } + + return 0; +} +EXPORT_SYMBOL(gnet_stats_copy_rate_est); + +static void gnet_stats_add_queue_cpu(struct gnet_stats_queue *qstats, + const struct gnet_stats_queue __percpu *q) +{ + int i; + + for_each_possible_cpu(i) { + const struct gnet_stats_queue *qcpu = per_cpu_ptr(q, i); + + qstats->qlen += qcpu->qlen; + qstats->backlog += qcpu->backlog; + qstats->drops += qcpu->drops; + qstats->requeues += qcpu->requeues; + qstats->overlimits += qcpu->overlimits; + } +} + +void gnet_stats_add_queue(struct gnet_stats_queue *qstats, + const struct gnet_stats_queue __percpu *cpu, + const struct gnet_stats_queue *q) +{ + if (cpu) { + gnet_stats_add_queue_cpu(qstats, cpu); + } else { + qstats->qlen += q->qlen; + qstats->backlog += q->backlog; + qstats->drops += q->drops; + qstats->requeues += q->requeues; + qstats->overlimits += q->overlimits; + } +} +EXPORT_SYMBOL(gnet_stats_add_queue); + +/** + * gnet_stats_copy_queue - copy queue statistics into statistics TLV + * @d: dumping handle + * @cpu_q: per cpu queue statistics + * @q: queue statistics + * @qlen: queue length statistics + * + * Appends the queue statistics to the top level TLV created by + * gnet_stats_start_copy(). Using per cpu queue statistics if + * they are available. + * + * Returns 0 on success or -1 with the statistic lock released + * if the room in the socket buffer was not sufficient. + */ +int +gnet_stats_copy_queue(struct gnet_dump *d, + struct gnet_stats_queue __percpu *cpu_q, + struct gnet_stats_queue *q, __u32 qlen) +{ + struct gnet_stats_queue qstats = {0}; + + gnet_stats_add_queue(&qstats, cpu_q, q); + qstats.qlen = qlen; + + if (d->compat_tc_stats) { + d->tc_stats.drops = qstats.drops; + d->tc_stats.qlen = qstats.qlen; + d->tc_stats.backlog = qstats.backlog; + d->tc_stats.overlimits = qstats.overlimits; + } + + if (d->tail) + return gnet_stats_copy(d, TCA_STATS_QUEUE, + &qstats, sizeof(qstats), + TCA_STATS_PAD); + + return 0; +} +EXPORT_SYMBOL(gnet_stats_copy_queue); + +/** + * gnet_stats_copy_app - copy application specific statistics into statistics TLV + * @d: dumping handle + * @st: application specific statistics data + * @len: length of data + * + * Appends the application specific statistics to the top level TLV created by + * gnet_stats_start_copy() and remembers the data for XSTATS if the dumping + * handle is in backward compatibility mode. + * + * Returns 0 on success or -1 with the statistic lock released + * if the room in the socket buffer was not sufficient. + */ +int +gnet_stats_copy_app(struct gnet_dump *d, void *st, int len) +{ + if (d->compat_xstats) { + d->xstats = kmemdup(st, len, GFP_ATOMIC); + if (!d->xstats) + goto err_out; + d->xstats_len = len; + } + + if (d->tail) + return gnet_stats_copy(d, TCA_STATS_APP, st, len, + TCA_STATS_PAD); + + return 0; + +err_out: + if (d->lock) + spin_unlock_bh(d->lock); + d->xstats_len = 0; + return -1; +} +EXPORT_SYMBOL(gnet_stats_copy_app); + +/** + * gnet_stats_finish_copy - finish dumping procedure + * @d: dumping handle + * + * Corrects the length of the top level TLV to include all TLVs added + * by gnet_stats_copy_XXX() calls. Adds the backward compatibility TLVs + * if gnet_stats_start_copy_compat() was used and releases the statistics + * lock. + * + * Returns 0 on success or -1 with the statistic lock released + * if the room in the socket buffer was not sufficient. + */ +int +gnet_stats_finish_copy(struct gnet_dump *d) +{ + if (d->tail) + d->tail->nla_len = skb_tail_pointer(d->skb) - (u8 *)d->tail; + + if (d->compat_tc_stats) + if (gnet_stats_copy(d, d->compat_tc_stats, &d->tc_stats, + sizeof(d->tc_stats), d->padattr) < 0) + return -1; + + if (d->compat_xstats && d->xstats) { + if (gnet_stats_copy(d, d->compat_xstats, d->xstats, + d->xstats_len, d->padattr) < 0) + return -1; + } + + if (d->lock) + spin_unlock_bh(d->lock); + kfree(d->xstats); + d->xstats = NULL; + d->xstats_len = 0; + return 0; +} +EXPORT_SYMBOL(gnet_stats_finish_copy); -- cgit v1.2.3