Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextgrafted

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().
  ...

1 files changed, 262 insertions, 0 deletions

diff --git a/arch/arm64/kernel/patch-scs.c b/arch/arm64/kernel/patch-scs.c
new file mode 100644
index 000000000..a1fe4b4ff
--- /dev/null
+++ b/arch/arm64/kernel/patch-scs.c
@@ -0,0 +1,262 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2022 - Google LLC
+ * Author: Ard Biesheuvel <ardb@google.com>
+ */
+
+#include <linux/bug.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/linkage.h>
+#include <linux/printk.h>
+#include <linux/types.h>
+
+#include <asm/cacheflush.h>
+#include <asm/scs.h>
+
+//
+// This minimal DWARF CFI parser is partially based on the code in
+// arch/arc/kernel/unwind.c, and on the document below:
+// https://refspecs.linuxbase.org/LSB_4.0.0/LSB-Core-generic/LSB-Core-generic/ehframechpt.html
+//
+
+#define DW_CFA_nop                          0x00
+#define DW_CFA_set_loc                      0x01
+#define DW_CFA_advance_loc1                 0x02
+#define DW_CFA_advance_loc2                 0x03
+#define DW_CFA_advance_loc4                 0x04
+#define DW_CFA_offset_extended              0x05
+#define DW_CFA_restore_extended             0x06
+#define DW_CFA_undefined                    0x07
+#define DW_CFA_same_value                   0x08
+#define DW_CFA_register                     0x09
+#define DW_CFA_remember_state               0x0a
+#define DW_CFA_restore_state                0x0b
+#define DW_CFA_def_cfa                      0x0c
+#define DW_CFA_def_cfa_register             0x0d
+#define DW_CFA_def_cfa_offset               0x0e
+#define DW_CFA_def_cfa_expression           0x0f
+#define DW_CFA_expression                   0x10
+#define DW_CFA_offset_extended_sf           0x11
+#define DW_CFA_def_cfa_sf                   0x12
+#define DW_CFA_def_cfa_offset_sf            0x13
+#define DW_CFA_val_offset                   0x14
+#define DW_CFA_val_offset_sf                0x15
+#define DW_CFA_val_expression               0x16
+#define DW_CFA_lo_user                      0x1c
+#define DW_CFA_negate_ra_state              0x2d
+#define DW_CFA_GNU_args_size                0x2e
+#define DW_CFA_GNU_negative_offset_extended 0x2f
+#define DW_CFA_hi_user                      0x3f
+
+extern const u8 __eh_frame_start[], __eh_frame_end[];
+
+enum {
+	PACIASP		= 0xd503233f,
+	AUTIASP		= 0xd50323bf,
+	SCS_PUSH	= 0xf800865e,
+	SCS_POP		= 0xf85f8e5e,
+};
+
+static void __always_inline scs_patch_loc(u64 loc)
+{
+	u32 insn = le32_to_cpup((void *)loc);
+
+	switch (insn) {
+	case PACIASP:
+		*(u32 *)loc = cpu_to_le32(SCS_PUSH);
+		break;
+	case AUTIASP:
+		*(u32 *)loc = cpu_to_le32(SCS_POP);
+		break;
+	default:
+		/*
+		 * While the DW_CFA_negate_ra_state directive is guaranteed to
+		 * appear right after a PACIASP/AUTIASP instruction, it may
+		 * also appear after a DW_CFA_restore_state directive that
+		 * restores a state that is only partially accurate, and is
+		 * followed by DW_CFA_negate_ra_state directive to toggle the
+		 * PAC bit again. So we permit other instructions here, and ignore
+		 * them.
+		 */
+		return;
+	}
+	dcache_clean_pou(loc, loc + sizeof(u32));
+}
+
+/*
+ * Skip one uleb128/sleb128 encoded quantity from the opcode stream. All bytes
+ * except the last one have bit #7 set.
+ */
+static int __always_inline skip_xleb128(const u8 **opcode, int size)
+{
+	u8 c;
+
+	do {
+		c = *(*opcode)++;
+		size--;
+	} while (c & BIT(7));
+
+	return size;
+}
+
+struct eh_frame {
+	/*
+	 * The size of this frame if 0 < size < U32_MAX, 0 terminates the list.
+	 */
+	u32	size;
+
+	/*
+	 * The first frame is a Common Information Entry (CIE) frame, followed
+	 * by one or more Frame Description Entry (FDE) frames. In the former
+	 * case, this field is 0, otherwise it is the negated offset relative
+	 * to the associated CIE frame.
+	 */
+	u32	cie_id_or_pointer;
+
+	union {
+		struct { // CIE
+			u8	version;
+			u8	augmentation_string[];
+		};
+
+		struct { // FDE
+			s32	initial_loc;
+			s32	range;
+			u8	opcodes[];
+		};
+	};
+};
+
+static int noinstr scs_handle_fde_frame(const struct eh_frame *frame,
+					bool fde_has_augmentation_data,
+					int code_alignment_factor,
+					bool dry_run)
+{
+	int size = frame->size - offsetof(struct eh_frame, opcodes) + 4;
+	u64 loc = (u64)offset_to_ptr(&frame->initial_loc);
+	const u8 *opcode = frame->opcodes;
+
+	if (fde_has_augmentation_data) {
+		int l;
+
+		// assume single byte uleb128_t
+		if (WARN_ON(*opcode & BIT(7)))
+			return -ENOEXEC;
+
+		l = *opcode++;
+		opcode += l;
+		size -= l + 1;
+	}
+
+	/*
+	 * Starting from 'loc', apply the CFA opcodes that advance the location
+	 * pointer, and identify the locations of the PAC instructions.
+	 */
+	while (size-- > 0) {
+		switch (*opcode++) {
+		case DW_CFA_nop:
+		case DW_CFA_remember_state:
+		case DW_CFA_restore_state:
+			break;
+
+		case DW_CFA_advance_loc1:
+			loc += *opcode++ * code_alignment_factor;
+			size--;
+			break;
+
+		case DW_CFA_advance_loc2:
+			loc += *opcode++ * code_alignment_factor;
+			loc += (*opcode++ << 8) * code_alignment_factor;
+			size -= 2;
+			break;
+
+		case DW_CFA_def_cfa:
+		case DW_CFA_offset_extended:
+			size = skip_xleb128(&opcode, size);
+			fallthrough;
+		case DW_CFA_def_cfa_offset:
+		case DW_CFA_def_cfa_offset_sf:
+		case DW_CFA_def_cfa_register:
+		case DW_CFA_same_value:
+		case DW_CFA_restore_extended:
+		case 0x80 ... 0xbf:
+			size = skip_xleb128(&opcode, size);
+			break;
+
+		case DW_CFA_negate_ra_state:
+			if (!dry_run)
+				scs_patch_loc(loc - 4);
+			break;
+
+		case 0x40 ... 0x7f:
+			// advance loc
+			loc += (opcode[-1] & 0x3f) * code_alignment_factor;
+			break;
+
+		case 0xc0 ... 0xff:
+			break;
+
+		default:
+			pr_err("unhandled opcode: %02x in FDE frame %lx\n", opcode[-1], (uintptr_t)frame);
+			return -ENOEXEC;
+		}
+	}
+	return 0;
+}
+
+int noinstr scs_patch(const u8 eh_frame[], int size)
+{
+	const u8 *p = eh_frame;
+
+	while (size > 4) {
+		const struct eh_frame *frame = (const void *)p;
+		bool fde_has_augmentation_data = true;
+		int code_alignment_factor = 1;
+		int ret;
+
+		if (frame->size == 0 ||
+		    frame->size == U32_MAX ||
+		    frame->size > size)
+			break;
+
+		if (frame->cie_id_or_pointer == 0) {
+			const u8 *p = frame->augmentation_string;
+
+			/* a 'z' in the augmentation string must come first */
+			fde_has_augmentation_data = *p == 'z';
+
+			/*
+			 * The code alignment factor is a uleb128 encoded field
+			 * but given that the only sensible values are 1 or 4,
+			 * there is no point in decoding the whole thing.
+			 */
+			p += strlen(p) + 1;
+			if (!WARN_ON(*p & BIT(7)))
+				code_alignment_factor = *p;
+		} else {
+			ret = scs_handle_fde_frame(frame,
+						   fde_has_augmentation_data,
+						   code_alignment_factor,
+						   true);
+			if (ret)
+				return ret;
+			scs_handle_fde_frame(frame, fde_has_augmentation_data,
+					     code_alignment_factor, false);
+		}
+
+		p += sizeof(frame->size) + frame->size;
+		size -= sizeof(frame->size) + frame->size;
+	}
+	return 0;
+}
+
+asmlinkage void __init scs_patch_vmlinux(void)
+{
+	if (!should_patch_pac_into_scs())
+		return;
+
+	WARN_ON(scs_patch(__eh_frame_start, __eh_frame_end - __eh_frame_start));
+	icache_inval_all_pou();
+	isb();
+}