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, 53 insertions, 17 deletions

diff --git a/Documentation/networking/can.rst b/Documentation/networking/can.rst
index ff05cbd05e0d..f8dae662e454 100644
--- a/Documentation/networking/can.rst
+++ b/Documentation/networking/can.rst
@@ -228,20 +228,36 @@ send(2), sendto(2), sendmsg(2) and the recv* counterpart operations
 on the socket as usual. There are also CAN specific socket options
 described below.
 
-The basic CAN frame structure and the sockaddr structure are defined
-in include/linux/can.h:
+The Classical CAN frame structure (aka CAN 2.0B), the CAN FD frame structure
+and the sockaddr structure are defined in include/linux/can.h:
 
 .. code-block:: C
 
     struct can_frame {
             canid_t can_id;  /* 32 bit CAN_ID + EFF/RTR/ERR flags */
-            __u8    can_dlc; /* frame payload length in byte (0 .. 8) */
+            union {
+                    /* CAN frame payload length in byte (0 .. CAN_MAX_DLEN)
+                     * was previously named can_dlc so we need to carry that
+                     * name for legacy support
+                     */
+                    __u8 len;
+                    __u8 can_dlc; /* deprecated */
+            };
             __u8    __pad;   /* padding */
             __u8    __res0;  /* reserved / padding */
-            __u8    __res1;  /* reserved / padding */
+            __u8    len8_dlc; /* optional DLC for 8 byte payload length (9 .. 15) */
             __u8    data[8] __attribute__((aligned(8)));
     };
 
+Remark: The len element contains the payload length in bytes and should be
+used instead of can_dlc. The deprecated can_dlc was misleadingly named as
+it always contained the plain payload length in bytes and not the so called
+'data length code' (DLC).
+
+To pass the raw DLC from/to a Classical CAN network device the len8_dlc
+element can contain values 9 .. 15 when the len element is 8 (the real
+payload length for all DLC values greater or equal to 8).
+
 The alignment of the (linear) payload data[] to a 64bit boundary
 allows the user to define their own structs and unions to easily access
 the CAN payload. There is no given byteorder on the CAN bus by
@@ -260,6 +276,23 @@ PF_PACKET socket, that also binds to a specific interface:
                     /* transport protocol class address info (e.g. ISOTP) */
                     struct { canid_t rx_id, tx_id; } tp;
 
+                    /* J1939 address information */
+                    struct {
+                            /* 8 byte name when using dynamic addressing */
+                            __u64 name;
+
+                            /* pgn:
+                             * 8 bit: PS in PDU2 case, else 0
+                             * 8 bit: PF
+                             * 1 bit: DP
+                             * 1 bit: reserved
+                             */
+                            __u32 pgn;
+
+                            /* 1 byte address */
+                            __u8 addr;
+                    } j1939;
+
                     /* reserved for future CAN protocols address information */
             } can_addr;
     };
@@ -371,7 +404,7 @@ kernel interfaces (ABI) which heavily rely on the CAN frame with fixed eight
 bytes of payload (struct can_frame) like the CAN_RAW socket. Therefore e.g.
 the CAN_RAW socket supports a new socket option CAN_RAW_FD_FRAMES that
 switches the socket into a mode that allows the handling of CAN FD frames
-and (legacy) CAN frames simultaneously (see :ref:`socketcan-rawfd`).
+and Classical CAN frames simultaneously (see :ref:`socketcan-rawfd`).
 
 The struct canfd_frame is defined in include/linux/can.h:
 
@@ -397,7 +430,7 @@ code (DLC) of the struct can_frame was used as a length information as the
 length and the DLC has a 1:1 mapping in the range of 0 .. 8. To preserve
 the easy handling of the length information the canfd_frame.len element
 contains a plain length value from 0 .. 64. So both canfd_frame.len and
-can_frame.can_dlc are equal and contain a length information and no DLC.
+can_frame.len are equal and contain a length information and no DLC.
 For details about the distinction of CAN and CAN FD capable devices and
 the mapping to the bus-relevant data length code (DLC), see :ref:`socketcan-can-fd-driver`.
 
@@ -407,7 +440,7 @@ definitions are specified for CAN specific MTUs in include/linux/can.h:
 
 .. code-block:: C
 
-  #define CAN_MTU   (sizeof(struct can_frame))   == 16  => 'legacy' CAN frame
+  #define CAN_MTU   (sizeof(struct can_frame))   == 16  => Classical CAN frame
   #define CANFD_MTU (sizeof(struct canfd_frame)) == 72  => CAN FD frame
 
 
@@ -609,7 +642,7 @@ Example:
             printf("got CAN FD frame with length %d\n", cfd.len);
             /* cfd.flags contains valid data */
     } else if (nbytes == CAN_MTU) {
-            printf("got legacy CAN frame with length %d\n", cfd.len);
+            printf("got Classical CAN frame with length %d\n", cfd.len);
             /* cfd.flags is undefined */
     } else {
             fprintf(stderr, "read: invalid CAN(FD) frame\n");
@@ -623,7 +656,7 @@ Example:
             printf("%02X ", cfd.data[i]);
 
 When reading with size CANFD_MTU only returns CAN_MTU bytes that have
-been received from the socket a legacy CAN frame has been read into the
+been received from the socket a Classical CAN frame has been read into the
 provided CAN FD structure. Note that the canfd_frame.flags data field is
 not specified in the struct can_frame and therefore it is only valid in
 CANFD_MTU sized CAN FD frames.
@@ -633,7 +666,7 @@ Implementation hint for new CAN applications:
 To build a CAN FD aware application use struct canfd_frame as basic CAN
 data structure for CAN_RAW based applications. When the application is
 executed on an older Linux kernel and switching the CAN_RAW_FD_FRAMES
-socket option returns an error: No problem. You'll get legacy CAN frames
+socket option returns an error: No problem. You'll get Classical CAN frames
 or CAN FD frames and can process them the same way.
 
 When sending to CAN devices make sure that the device is capable to handle
@@ -842,6 +875,8 @@ TX_RESET_MULTI_IDX:
 RX_RTR_FRAME:
 	Send reply for RTR-request (placed in op->frames[0]).
 
+CAN_FD_FRAME:
+	The CAN frames following the bcm_msg_head are struct canfd_frame's
 
 Broadcast Manager Transmission Timers
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
@@ -1026,7 +1061,7 @@ Additional procfs files in /proc/net/can::
 
     stats       - SocketCAN core statistics (rx/tx frames, match ratios, ...)
     reset_stats - manual statistic reset
-    version     - prints the SocketCAN core version and the ABI version
+    version     - prints SocketCAN core and ABI version (removed in Linux 5.10)
 
 
 Writing Own CAN Protocol Modules
@@ -1070,7 +1105,7 @@ General Settings
     dev->type  = ARPHRD_CAN; /* the netdevice hardware type */
     dev->flags = IFF_NOARP;  /* CAN has no arp */
 
-    dev->mtu = CAN_MTU; /* sizeof(struct can_frame) -> legacy CAN interface */
+    dev->mtu = CAN_MTU; /* sizeof(struct can_frame) -> Classical CAN interface */
 
     or alternative, when the controller supports CAN with flexible data rate:
     dev->mtu = CANFD_MTU; /* sizeof(struct canfd_frame) -> CAN FD interface */
@@ -1184,6 +1219,7 @@ Setting CAN device properties::
         [ fd { on | off } ]
         [ fd-non-iso { on | off } ]
         [ presume-ack { on | off } ]
+        [ cc-len8-dlc { on | off } ]
 
         [ restart-ms TIME-MS ]
         [ restart ]
@@ -1326,22 +1362,22 @@ arbitration phase and the payload phase of the CAN FD frame. Therefore a
 second bit timing has to be specified in order to enable the CAN FD bitrate.
 
 Additionally CAN FD capable CAN controllers support up to 64 bytes of
-payload. The representation of this length in can_frame.can_dlc and
+payload. The representation of this length in can_frame.len and
 canfd_frame.len for userspace applications and inside the Linux network
 layer is a plain value from 0 .. 64 instead of the CAN 'data length code'.
-The data length code was a 1:1 mapping to the payload length in the legacy
+The data length code was a 1:1 mapping to the payload length in the Classical
 CAN frames anyway. The payload length to the bus-relevant DLC mapping is
 only performed inside the CAN drivers, preferably with the helper
-functions can_dlc2len() and can_len2dlc().
+functions can_fd_dlc2len() and can_fd_len2dlc().
 
 The CAN netdevice driver capabilities can be distinguished by the network
 devices maximum transfer unit (MTU)::
 
-  MTU = 16 (CAN_MTU)   => sizeof(struct can_frame)   => 'legacy' CAN device
+  MTU = 16 (CAN_MTU)   => sizeof(struct can_frame)   => Classical CAN device
   MTU = 72 (CANFD_MTU) => sizeof(struct canfd_frame) => CAN FD capable device
 
 The CAN device MTU can be retrieved e.g. with a SIOCGIFMTU ioctl() syscall.
-N.B. CAN FD capable devices can also handle and send legacy CAN frames.
+N.B. CAN FD capable devices can also handle and send Classical CAN frames.
 
 When configuring CAN FD capable CAN controllers an additional 'data' bitrate
 has to be set. This bitrate for the data phase of the CAN FD frame has to be