Merge tag 'net-next-5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next

Pull networking updates from Jakub Kicinski:
 "Core:

   - support "prefer busy polling" NAPI operation mode, where we defer
     softirq for some time expecting applications to periodically busy
     poll

   - AF_XDP: improve efficiency by more batching and hindering the
     adjacency cache prefetcher

   - af_packet: make packet_fanout.arr size configurable up to 64K

   - tcp: optimize TCP zero copy receive in presence of partial or
     unaligned reads making zero copy a performance win for much smaller
     messages

   - XDP: add bulk APIs for returning / freeing frames

   - sched: support fragmenting IP packets as they come out of conntrack

   - net: allow virtual netdevs to forward UDP L4 and fraglist GSO skbs

  BPF:

   - BPF switch from crude rlimit-based to memcg-based memory accounting

   - BPF type format information for kernel modules and related tracing
     enhancements

   - BPF implement task local storage for BPF LSM

   - allow the FENTRY/FEXIT/RAW_TP tracing programs to use
     bpf_sk_storage

  Protocols:

   - mptcp: improve multiple xmit streams support, memory accounting and
     many smaller improvements

   - TLS: support CHACHA20-POLY1305 cipher

   - seg6: add support for SRv6 End.DT4/DT6 behavior

   - sctp: Implement RFC 6951: UDP Encapsulation of SCTP

   - ppp_generic: add ability to bridge channels directly

   - bridge: Connectivity Fault Management (CFM) support as is defined
     in IEEE 802.1Q section 12.14.

  Drivers:

   - mlx5: make use of the new auxiliary bus to organize the driver
     internals

   - mlx5: more accurate port TX timestamping support

   - mlxsw:
      - improve the efficiency of offloaded next hop updates by using
        the new nexthop object API
      - support blackhole nexthops
      - support IEEE 802.1ad (Q-in-Q) bridging

   - rtw88: major bluetooth co-existance improvements

   - iwlwifi: support new 6 GHz frequency band

   - ath11k: Fast Initial Link Setup (FILS)

   - mt7915: dual band concurrent (DBDC) support

   - net: ipa: add basic support for IPA v4.5

  Refactor:

   - a few pieces of in_interrupt() cleanup work from Sebastian Andrzej
     Siewior

   - phy: add support for shared interrupts; get rid of multiple driver
     APIs and have the drivers write a full IRQ handler, slight growth
     of driver code should be compensated by the simpler API which also
     allows shared IRQs

   - add common code for handling netdev per-cpu counters

   - move TX packet re-allocation from Ethernet switch tag drivers to a
     central place

   - improve efficiency and rename nla_strlcpy

   - number of W=1 warning cleanups as we now catch those in a patchwork
     build bot

  Old code removal:

   - wan: delete the DLCI / SDLA drivers

   - wimax: move to staging

   - wifi: remove old WDS wifi bridging support"

* tag 'net-next-5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1922 commits)
  net: hns3: fix expression that is currently always true
  net: fix proc_fs init handling in af_packet and tls
  nfc: pn533: convert comma to semicolon
  af_vsock: Assign the vsock transport considering the vsock address flags
  af_vsock: Set VMADDR_FLAG_TO_HOST flag on the receive path
  vsock_addr: Check for supported flag values
  vm_sockets: Add VMADDR_FLAG_TO_HOST vsock flag
  vm_sockets: Add flags field in the vsock address data structure
  net: Disable NETIF_F_HW_TLS_TX when HW_CSUM is disabled
  tcp: Add logic to check for SYN w/ data in tcp_simple_retransmit
  net: mscc: ocelot: install MAC addresses in .ndo_set_rx_mode from process context
  nfc: s3fwrn5: Release the nfc firmware
  net: vxget: clean up sparse warnings
  mlxsw: spectrum_router: Use eXtended mezzanine to offload IPv4 router
  mlxsw: spectrum: Set KVH XLT cache mode for Spectrum2/3
  mlxsw: spectrum_router_xm: Introduce basic XM cache flushing
  mlxsw: reg: Add Router LPM Cache Enable Register
  mlxsw: reg: Add Router LPM Cache ML Delete Register
  mlxsw: spectrum_router_xm: Implement L-value tracking for M-index
  mlxsw: reg: Add XM Router M Table Register
  ...

1 files changed, 42 insertions, 4 deletions

diff --git a/Documentation/networking/j1939.rst b/Documentation/networking/j1939.rst
index 0a4b73b03b99..b705d2801e9c 100644
--- a/Documentation/networking/j1939.rst
+++ b/Documentation/networking/j1939.rst
@@ -69,18 +69,56 @@ J1939 concepts
 PGN
 ---
 
+The J1939 protocol uses the 29-bit CAN identifier with the following structure:
+
+  ============  ==============  ====================
+  29 bit CAN-ID
+  --------------------------------------------------
+  Bit positions within the CAN-ID
+  --------------------------------------------------
+  28 ... 26     25 ... 8        7 ... 0
+  ============  ==============  ====================
+  Priority      PGN             SA (Source Address)
+  ============  ==============  ====================
+
 The PGN (Parameter Group Number) is a number to identify a packet. The PGN
 is composed as follows:
-1 bit  : Reserved Bit
-1 bit  : Data Page
-8 bits : PF (PDU Format)
-8 bits : PS (PDU Specific)
+
+  ============  ==============  =================  =================
+  PGN
+  ------------------------------------------------------------------
+  Bit positions within the CAN-ID
+  ------------------------------------------------------------------
+  25            24              23 ... 16          15 ... 8
+  ============  ==============  =================  =================
+  R (Reserved)  DP (Data Page)  PF (PDU Format)    PS (PDU Specific)
+  ============  ==============  =================  =================
 
 In J1939-21 distinction is made between PDU1 format (where PF < 240) and PDU2
 format (where PF >= 240). Furthermore, when using the PDU2 format, the PS-field
 contains a so-called Group Extension, which is part of the PGN. When using PDU2
 format, the Group Extension is set in the PS-field.
 
+  ==============  ========================
+  PDU1 Format (specific) (peer to peer)
+  ----------------------------------------
+  Bit positions within the CAN-ID
+  ----------------------------------------
+  23 ... 16       15 ... 8
+  ==============  ========================
+  00h ... EFh     DA (Destination address)
+  ==============  ========================
+
+  ==============  ========================
+  PDU2 Format (global) (broadcast)
+  ----------------------------------------
+  Bit positions within the CAN-ID
+  ----------------------------------------
+  23 ... 16       15 ... 8
+  ==============  ========================
+  F0h ... FFh     GE (Group Extenstion)
+  ==============  ========================
+
 On the other hand, when using PDU1 format, the PS-field contains a so-called
 Destination Address, which is _not_ part of the PGN. When communicating a PGN
 from user space to kernel (or vice versa) and PDU2 format is used, the PS-field