Merge tag 'net-next-6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next

Pull networking updates from Paolo Abeni:
 "The most significant set of changes is the per netns RTNL. The new
  behavior is disabled by default, regression risk should be contained.

  Notably the new config knob PTP_1588_CLOCK_VMCLOCK will inherit its
  default value from PTP_1588_CLOCK_KVM, as the first is intended to be
  a more reliable replacement for the latter.

  Core:

   - Started a very large, in-progress, effort to make the RTNL lock
     scope per network-namespace, thus reducing the lock contention
     significantly in the containerized use-case, comprising:
       - RCU-ified some relevant slices of the FIB control path
       - introduce basic per netns locking helpers
       - namespacified the IPv4 address hash table
       - remove rtnl_register{,_module}() in favour of
         rtnl_register_many()
       - refactor rtnl_{new,del,set}link() moving as much validation as
         possible out of RTNL lock
       - convert all phonet doit() and dumpit() handlers to RCU
       - convert IPv4 addresses manipulation to per-netns RTNL
       - convert virtual interface creation to per-netns RTNL
     the per-netns lock infrastructure is guarded by the
     CONFIG_DEBUG_NET_SMALL_RTNL knob, disabled by default ad interim.

   - Introduce NAPI suspension, to efficiently switching between busy
     polling (NAPI processing suspended) and normal processing.

   - Migrate the IPv4 routing input, output and control path from direct
     ToS usage to DSCP macros. This is a work in progress to make ECN
     handling consistent and reliable.

   - Add drop reasons support to the IPv4 rotue input path, allowing
     better introspection in case of packets drop.

   - Make FIB seqnum lockless, dropping RTNL protection for read access.

   - Make inet{,v6} addresses hashing less predicable.

   - Allow providing timestamp OPT_ID via cmsg, to correlate TX packets
     and timestamps

  Things we sprinkled into general kernel code:

   - Add small file operations for debugfs, to reduce the struct ops
     size.

   - Refactoring and optimization for the implementation of page_frag
     API, This is a preparatory work to consolidate the page_frag
     implementation.

  Netfilter:

   - Optimize set element transactions to reduce memory consumption

   - Extended netlink error reporting for attribute parser failure.

   - Make legacy xtables configs user selectable, giving users the
     option to configure iptables without enabling any other config.

   - Address a lot of false-positive RCU issues, pointed by recent CI
     improvements.

  BPF:

   - Put xsk sockets on a struct diet and add various cleanups. Overall,
     this helps to bump performance by 12% for some workloads.

   - Extend BPF selftests to increase coverage of XDP features in
     combination with BPF cpumap.

   - Optimize and homogenize bpf_csum_diff helper for all archs and also
     add a batch of new BPF selftests for it.

   - Extend netkit with an option to delegate skb->{mark,priority}
     scrubbing to its BPF program.

   - Make the bpf_get_netns_cookie() helper available also to tc(x) BPF
     programs.

  Protocols:

   - Introduces 4-tuple hash for connected udp sockets, speeding-up
     significantly connected sockets lookup.

   - Add a fastpath for some TCP timers that usually expires after
     close, the socket lock contention.

   - Add inbound and outbound xfrm state caches to speed up state
     lookups.

   - Avoid sending MPTCP advertisements on stale subflows, reducing
     risks on loosing them.

   - Make neighbours table flushing more scalable, maintaining per
     device neigh lists.

  Driver API:

   - Introduce a unified interface to configure transmission H/W
     shaping, and expose it to user-space via generic-netlink.

   - Add support for per-NAPI config via netlink. This makes napi
     configuration persistent across queues removal and re-creation.
     Requires driver updates, currently supported drivers are:
     nVidia/Mellanox mlx4 and mlx5, Broadcom brcm and Intel ice.

   - Add ethtool support for writing SFP / PHY firmware blocks.

   - Track RSS context allocation from ethtool core.

   - Implement support for mirroring to DSA CPU port, via TC mirror
     offload.

   - Consolidate FDB updates notification, to avoid duplicates on
     device-specific entries.

   - Expose DPLL clock quality level to the user-space.

   - Support master-slave PHY config via device tree.

  Tests and tooling:

   - forwarding: introduce deferred commands, to simplify the cleanup
     phase

  Drivers:

   - Updated several drivers - Amazon vNic, Google vNic, Microsoft vNic,
     Intel e1000e and Broadcom Tigon3 - to use netdev-genl to link the
     IRQs and queues to NAPI IDs, allowing busy polling and better
     introspection.

   - Ethernet high-speed NICs:
      - nVidia/Mellanox:
         - mlx5:
           - a large refactor to implement support for cross E-Switch
             scheduling
           - refactor H/W conter management to let it scale better
           - H/W GRO cleanups
      - Intel (100G, ice)::
         - add support for ethtool reset
         - implement support for per TX queue H/W shaping
      - AMD/Solarflare:
         - implement per device queue stats support
      - Broadcom (bnxt):
         - improve wildcard l4proto on IPv4/IPv6 ntuple rules
      - Marvell Octeon:
         - Add representor support for each Resource Virtualization Unit
           (RVU) device.
      - Hisilicon:
         - add support for the BMC Gigabit Ethernet
      - IBM (EMAC):
         - driver cleanup and modernization
      - Cisco (VIC):
         - raise the queues number limit to 256

   - Ethernet virtual:
      - Google vNIC:
         - implement page pool support
      - macsec:
         - inherit lower device's features and TSO limits when
           offloading
      - virtio_net:
         - enable premapped mode by default
         - support for XDP socket(AF_XDP) zerocopy TX
      - wireguard:
         - set the TSO max size to be GSO_MAX_SIZE, to aggregate larger
           packets.

   - Ethernet NICs embedded and virtual:
      - Broadcom ASP:
         - enable software timestamping
      - Freescale:
         - add enetc4 PF driver
      - MediaTek: Airoha SoC:
         - implement BQL support
      - RealTek r8169:
         - enable TSO by default on r8168/r8125
         - implement extended ethtool stats
      - Renesas AVB:
         - enable TX checksum offload
      - Synopsys (stmmac):
         - support header splitting for vlan tagged packets
         - move common code for DWMAC4 and DWXGMAC into a separate FPE
           module.
         - add dwmac driver support for T-HEAD TH1520 SoC
      - Synopsys (xpcs):
         - driver refactor and cleanup
      - TI:
         - icssg_prueth: add VLAN offload support
      - Xilinx emaclite:
         - add clock support

   - Ethernet switches:
      - Microchip:
         - implement support for the lan969x Ethernet switch family
         - add LAN9646 switch support to KSZ DSA driver

   - Ethernet PHYs:
      - Marvel: 88q2x: enable auto negotiation
      - Microchip: add support for LAN865X Rev B1 and LAN867X Rev C1/C2

   - PTP:
      - Add support for the Amazon virtual clock device
      - Add PtP driver for s390 clocks

   - WiFi:
      - mac80211
         - EHT 1024 aggregation size for transmissions
         - new operation to indicate that a new interface is to be added
         - support radio separation of multi-band devices
         - move wireless extension spy implementation to libiw
      - Broadcom:
         - brcmfmac: optional LPO clock support
      - Microchip:
         - add support for Atmel WILC3000
      - Qualcomm (ath12k):
         - firmware coredump collection support
         - add debugfs support for a multitude of statistics
      - Qualcomm (ath5k):
         -  Arcadyan ARV45XX AR2417 & Gigaset SX76[23] AR241[34]A support
      - Realtek:
         - rtw88: 8821au and 8812au USB adapters support
         - rtw89: add thermal protection
         - rtw89: fine tune BT-coexsitence to improve user experience
         - rtw89: firmware secure boot for WiFi 6 chip

   - Bluetooth
      - add Qualcomm WCN785x support for ids Foxconn 0xe0fc/0xe0f3 and
        0x13d3:0x3623
      - add Realtek RTL8852BE support for id Foxconn 0xe123
      - add MediaTek MT7920 support for wireless module ids
      - btintel_pcie: add handshake between driver and firmware
      - btintel_pcie: add recovery mechanism
      - btnxpuart: add GPIO support to power save feature"

* tag 'net-next-6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1475 commits)
  mm: page_frag: fix a compile error when kernel is not compiled
  Documentation: tipc: fix formatting issue in tipc.rst
  selftests: nic_performance: Add selftest for performance of NIC driver
  selftests: nic_link_layer: Add selftest case for speed and duplex states
  selftests: nic_link_layer: Add link layer selftest for NIC driver
  bnxt_en: Add FW trace coredump segments to the coredump
  bnxt_en: Add a new ethtool -W dump flag
  bnxt_en: Add 2 parameters to bnxt_fill_coredump_seg_hdr()
  bnxt_en: Add functions to copy host context memory
  bnxt_en: Do not free FW log context memory
  bnxt_en: Manage the FW trace context memory
  bnxt_en: Allocate backing store memory for FW trace logs
  bnxt_en: Add a 'force' parameter to bnxt_free_ctx_mem()
  bnxt_en: Refactor bnxt_free_ctx_mem()
  bnxt_en: Add mem_valid bit to struct bnxt_ctx_mem_type
  bnxt_en: Update firmware interface spec to 1.10.3.85
  selftests/bpf: Add some tests with sockmap SK_PASS
  bpf: fix recursive lock when verdict program return SK_PASS
  wireguard: device: support big tcp GSO
  wireguard: selftests: load nf_conntrack if not present
  ...

1 files changed, 132 insertions, 65 deletions

diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c
index de20928f7402..4ea44a2f48f7 100644
--- a/drivers/net/netconsole.c
+++ b/drivers/net/netconsole.c
@@ -1058,102 +1058,105 @@ static struct notifier_block netconsole_netdev_notifier = {
 	.notifier_call  = netconsole_netdev_event,
 };
 
-/**
- * send_ext_msg_udp - send extended log message to target
- * @nt: target to send message to
- * @msg: extended log message to send
- * @msg_len: length of message
- *
- * Transfer extended log @msg to @nt.  If @msg is longer than
- * MAX_PRINT_CHUNK, it'll be split and transmitted in multiple chunks with
- * ncfrag header field added to identify them.
- */
-static void send_ext_msg_udp(struct netconsole_target *nt, const char *msg,
-			     int msg_len)
+static void send_msg_no_fragmentation(struct netconsole_target *nt,
+				      const char *msg,
+				      int msg_len,
+				      int release_len)
 {
 	static char buf[MAX_PRINT_CHUNK]; /* protected by target_list_lock */
-	const char *header, *body;
-	int offset = 0;
-	int header_len, body_len;
-	const char *msg_ready = msg;
+	const char *userdata = NULL;
 	const char *release;
-	int release_len = 0;
-	int userdata_len = 0;
-	char *userdata = NULL;
 
 #ifdef CONFIG_NETCONSOLE_DYNAMIC
 	userdata = nt->userdata_complete;
-	userdata_len = nt->userdata_length;
 #endif
 
-	if (nt->release) {
+	if (release_len) {
 		release = init_utsname()->release;
-		release_len = strlen(release) + 1;
+
+		scnprintf(buf, MAX_PRINT_CHUNK, "%s,%s", release, msg);
+		msg_len += release_len;
+	} else {
+		memcpy(buf, msg, msg_len);
 	}
 
-	if (msg_len + release_len + userdata_len <= MAX_PRINT_CHUNK) {
-		/* No fragmentation needed */
-		if (nt->release) {
-			scnprintf(buf, MAX_PRINT_CHUNK, "%s,%s", release, msg);
-			msg_len += release_len;
-		} else {
-			memcpy(buf, msg, msg_len);
-		}
+	if (userdata)
+		msg_len += scnprintf(&buf[msg_len],
+				     MAX_PRINT_CHUNK - msg_len,
+				     "%s", userdata);
 
-		if (userdata)
-			msg_len += scnprintf(&buf[msg_len],
-					     MAX_PRINT_CHUNK - msg_len,
-					     "%s", userdata);
+	netpoll_send_udp(&nt->np, buf, msg_len);
+}
 
-		msg_ready = buf;
-		netpoll_send_udp(&nt->np, msg_ready, msg_len);
-		return;
-	}
+static void append_release(char *buf)
+{
+	const char *release;
 
-	/* need to insert extra header fields, detect header and body */
-	header = msg;
-	body = memchr(msg, ';', msg_len);
-	if (WARN_ON_ONCE(!body))
-		return;
+	release = init_utsname()->release;
+	scnprintf(buf, MAX_PRINT_CHUNK, "%s,", release);
+}
 
-	header_len = body - header;
-	body_len = msg_len - header_len - 1;
-	body++;
+static void send_fragmented_body(struct netconsole_target *nt, char *buf,
+				 const char *msgbody, int header_len,
+				 int msgbody_len)
+{
+	const char *userdata = NULL;
+	int body_len, offset = 0;
+	int userdata_len = 0;
 
-	/*
-	 * Transfer multiple chunks with the following extra header.
-	 * "ncfrag=<byte-offset>/<total-bytes>"
+#ifdef CONFIG_NETCONSOLE_DYNAMIC
+	userdata = nt->userdata_complete;
+	userdata_len = nt->userdata_length;
+#endif
+
+	/* body_len represents the number of bytes that will be sent. This is
+	 * bigger than MAX_PRINT_CHUNK, thus, it will be split in multiple
+	 * packets
 	 */
-	if (nt->release)
-		scnprintf(buf, MAX_PRINT_CHUNK, "%s,", release);
-	memcpy(buf + release_len, header, header_len);
-	header_len += release_len;
+	body_len = msgbody_len + userdata_len;
 
-	while (offset < body_len + userdata_len) {
+	/* In each iteration of the while loop below, we send a packet
+	 * containing the header and a portion of the body. The body is
+	 * composed of two parts: msgbody and userdata. We keep track of how
+	 * many bytes have been sent so far using the offset variable, which
+	 * ranges from 0 to the total length of the body.
+	 */
+	while (offset < body_len) {
 		int this_header = header_len;
+		bool msgbody_written = false;
 		int this_offset = 0;
 		int this_chunk = 0;
 
 		this_header += scnprintf(buf + this_header,
-					 sizeof(buf) - this_header,
+					 MAX_PRINT_CHUNK - this_header,
 					 ",ncfrag=%d/%d;", offset,
-					 body_len + userdata_len);
+					 body_len);
 
-		/* Not all body data has been written yet */
-		if (offset < body_len) {
-			this_chunk = min(body_len - offset,
+		/* Not all msgbody data has been written yet */
+		if (offset < msgbody_len) {
+			this_chunk = min(msgbody_len - offset,
 					 MAX_PRINT_CHUNK - this_header);
 			if (WARN_ON_ONCE(this_chunk <= 0))
 				return;
-			memcpy(buf + this_header, body + offset, this_chunk);
+			memcpy(buf + this_header, msgbody + offset, this_chunk);
 			this_offset += this_chunk;
 		}
-		/* Body is fully written and there is pending userdata to write,
-		 * append userdata in this chunk
+
+		/* msgbody was finally written, either in the previous
+		 * messages and/or in the current buf. Time to write
+		 * the userdata.
 		 */
-		if (offset + this_offset >= body_len &&
-		    offset + this_offset < userdata_len + body_len) {
-			int sent_userdata = (offset + this_offset) - body_len;
+		msgbody_written |= offset + this_offset >= msgbody_len;
+
+		/* Msg body is fully written and there is pending userdata to
+		 * write, append userdata in this chunk
+		 */
+		if (msgbody_written && offset + this_offset < body_len) {
+			/* Track how much user data was already sent. First
+			 * time here, sent_userdata is zero
+			 */
+			int sent_userdata = (offset + this_offset) - msgbody_len;
+			/* offset of bytes used in current buf */
 			int preceding_bytes = this_chunk + this_header;
 
 			if (WARN_ON_ONCE(sent_userdata < 0))
@@ -1180,6 +1183,70 @@ static void send_ext_msg_udp(struct netconsole_target *nt, const char *msg,
 	}
 }
 
+static void send_msg_fragmented(struct netconsole_target *nt,
+				const char *msg,
+				int msg_len,
+				int release_len)
+{
+	static char buf[MAX_PRINT_CHUNK]; /* protected by target_list_lock */
+	int header_len, msgbody_len;
+	const char *msgbody;
+
+	/* need to insert extra header fields, detect header and msgbody */
+	msgbody = memchr(msg, ';', msg_len);
+	if (WARN_ON_ONCE(!msgbody))
+		return;
+
+	header_len = msgbody - msg;
+	msgbody_len = msg_len - header_len - 1;
+	msgbody++;
+
+	/*
+	 * Transfer multiple chunks with the following extra header.
+	 * "ncfrag=<byte-offset>/<total-bytes>"
+	 */
+	if (release_len)
+		append_release(buf);
+
+	/* Copy the header into the buffer */
+	memcpy(buf + release_len, msg, header_len);
+	header_len += release_len;
+
+	/* for now on, the header will be persisted, and the msgbody
+	 * will be replaced
+	 */
+	send_fragmented_body(nt, buf, msgbody, header_len, msgbody_len);
+}
+
+/**
+ * send_ext_msg_udp - send extended log message to target
+ * @nt: target to send message to
+ * @msg: extended log message to send
+ * @msg_len: length of message
+ *
+ * Transfer extended log @msg to @nt.  If @msg is longer than
+ * MAX_PRINT_CHUNK, it'll be split and transmitted in multiple chunks with
+ * ncfrag header field added to identify them.
+ */
+static void send_ext_msg_udp(struct netconsole_target *nt, const char *msg,
+			     int msg_len)
+{
+	int userdata_len = 0;
+	int release_len = 0;
+
+#ifdef CONFIG_NETCONSOLE_DYNAMIC
+	userdata_len = nt->userdata_length;
+#endif
+
+	if (nt->release)
+		release_len = strlen(init_utsname()->release) + 1;
+
+	if (msg_len + release_len + userdata_len <= MAX_PRINT_CHUNK)
+		return send_msg_no_fragmentation(nt, msg, msg_len, release_len);
+
+	return send_msg_fragmented(nt, msg, msg_len, release_len);
+}
+
 static void write_ext_msg(struct console *con, const char *msg,
 			  unsigned int len)
 {