The method ndo_start_xmit() returns a value of type netdev_tx_t. Fix
the ndo function to use the correct type. And emac_start_xmit() can
leak one skb if 'channel' == 3.
Signed-off-by: Yunjian Wang <wangyunjian@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Cong Wang says:

====================
net: reduce dynamic lockdep keys

syzbot has been complaining about low MAX_LOCKDEP_KEYS for a
long time, it is mostly because we register 4 dynamic keys per
network device.

This patchset reduces the number of dynamic lockdep keys from
4 to 1 per netdev, by reverting to the previous static keys,
except for addr_list_lock which still has to be dynamic.
The second patch removes a bonding-specific key by the way.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

After commit b3e80d44
("bonding: fix lockdep warning in bond_get_stats()") the dynamic
key is no longer necessary, as we compute nest level at run-time.
So, we can just remove it to save some lockdep key entries.

Test commands:
 ip link add bond0 type bond
 ip link add bond1 type bond
 ip link set bond0 master bond1
 ip link set bond0 nomaster
 ip link set bond1 master bond0

Reported-and-tested-by: syzbot+aaa6fa4949cc5d9b7b25@syzkaller.appspotmail.com
Cc: Dmitry Vyukov <dvyukov@google.com>
Acked-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

This patch reverts the folowing commits:

commit 064ff66e
"bonding: add missing netdev_update_lockdep_key()"

commit 53d37497
"net: avoid updating qdisc_xmit_lock_key in netdev_update_lockdep_key()"

commit 1f26c0d3
"net: fix kernel-doc warning in <linux/netdevice.h>"

commit ab92d68f
"net: core: add generic lockdep keys"

but keeps the addr_list_lock_key because we still lock
addr_list_lock nestedly on stack devices, unlikely xmit_lock
this is safe because we don't take addr_list_lock on any fast
path.

Reported-and-tested-by: syzbot+aaa6fa4949cc5d9b7b25@syzkaller.appspotmail.com
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Acked-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Grygorii Strashko says:

====================
net: ethernet: ti: k3: introduce common platform time sync driver - cpts

This series introduced support for significantly upgraded TI A65x/J721E Common
platform time sync (CPTS) modules which are part of AM65xx Time Synchronization
Architecture [1].
The TI A65x/J721E now contain more than one CPTS instance:
- MCU CPSW CPTS (IEEE 1588 compliant)
- Main NAVSS CPTS (central)
- PCIe CPTS(s) (PTM  compliant)
- J721E: Main CPSW9g CPTS (IEEE 1588 compliant)
which can work as separately as interact to each other through Time Sync Router
(TSR) and Compare Event Router (CER). In addition there are also ICSS-G IEP
blocks which can perform similar timsync functions, but require FW support.
More info also available in TRM [2][3]. Not all above modules are available
to the Linux by as of now as some of them are reserved for RTOS/FW purposes.

The scope of this submission is TI A65x/J721E CPSW CPTS and Main NAVSS CPTS,
and TSR was used for testing purposes.
                                                                       +---------------------------+
                                                                       | MCU CPSW                  |
+-------------------+           +------------------------+             |                TS         |
| Main Navss CPTS   |           | Time Sync Router (TSR) |             |          +-------------+  |
|                   |           |                        |             |          |             |  |
|            HW1_TS +<----------+                        |             | +--------v-----+    +--+--+
|                   |           |                        |             | |        CPTS  |    |Port |
|              ...  |           |                        |           X+-->HW1_TS        |    |     |
|            HW8_TS <------------<---------+             |           X|-->HW2_TS        |    +--^--+
|                   |           |          |             +--------------->HW3_TS        |       |  |
|                   |           |          |             +--------------->HW4_TS        |       |  |
|                   |           |          |             |             | |              |       |  |
|                   |           |          |             |             | |              |       |  |
|            Genf0  +----------->          (A)---------+ +<--------------+Genf0         |       |  |
|                   |           |          |             |             | |              |       |  |
|              ...  |           |          +-----------> <---------------+Genf1     ESTf+-------+  |
|                   |           |                        |             | |              |          |
|                   |           |                        |             | +--------------+          |
|            Genf8  +---------->+                        |             |                           |
|                   |           |    SYNC0 ...    SYNC3  |             |                           |
+-------------------+           +------+------------+----+             +---------------------------+
                                       +            +
                                       X            X
(A) shows possible routing path for MCU CPSW CPTS Genf0 signal as an example.

Main features of the new TI A65x/J721E CPTS modules are:
- 64-bit timestamp/counter mode support in ns by using add_val
- implemented in HW PPM and nudge adjustment.
- control of time sync events via interrupt or polling
- selection of multiple external reference clock sources
- hardware timestamp of ext. inputs events (HWx_TS_PUSH)
- periodic generator function outputs (TS_GENFx)
- (CPSW only) Ethernet Enhanced Scheduled Traffic Operations (CPTS_ESTFn),
  which drives TSN schedule
- timestamping of all RX packets bypassing CPTS FIFO

Patch 1 - DT bindings
Patch 2 - the AM65x/J721E driver
Patch 3 - enables packet timestamping support in TI AM65x/J721E MCU CPSW driver.
Patches 4-7 - DT updates.

=== PTP Testing:

phc2sys -s CLOCK_REALTIME -c eth0 -m -O 0 -u30
phc2sys[627.331]: eth0 rms 409912446712787392 max 1587584079521858304 freq  -6665 +/- 35040 delay   832 +/-  27
phc2sys[657.335]: eth0 rms   33 max   66 freq     -0 +/-  28 delay   820 +/-  30
phc2sys[687.339]: eth0 rms   37 max   70 freq     -1 +/-  32 delay   830 +/-  29
phc2sys[717.343]: eth0 rms   33 max   71 freq     -0 +/-  29 delay   828 +/-  23
phc2sys[747.346]: eth0 rms   35 max   75 freq     -0 +/-  31 delay   829 +/-  26
phc2sys[777.350]: eth0 rms   37 max   68 freq     -1 +/-  32 delay   825 +/-  25
phc2sys[807.354]: eth0 rms   28 max   57 freq     -1 +/-  25 delay   824 +/-  21
phc2sys[837.358]: eth0 rms   43 max   81 freq     -1 +/-  37 delay   836 +/-  23
phc2sys[867.361]: eth0 rms   33 max   74 freq     +0 +/-  29 delay   828 +/-  24
phc2sys[897.365]: eth0 rms   35 max   77 freq     -2 +/-  30 delay   824 +/-  25
phc2sys[927.369]: eth0 rms   28 max   50 freq     +0 +/-  25 delay   825 +/-  25

ptp4l -P -2 -H -i eth0 -l 6 -m -q -p /dev/ptp1 -f ptp.cfg -s
ptp4l[22095.754]: port 1: MASTER to UNCALIBRATED on RS_SLAVE
ptp4l[22097.754]: port 1: UNCALIBRATED to SLAVE on MASTER_CLOCK_SELECTED
ptp4l[22159.757]: rms  317 max 1418 freq    +79 +/- 186 delay   410 +/-   1
ptp4l[22223.760]: rms    9 max   24 freq    +42 +/-  12 delay   409 +/-   1
ptp4l[22287.763]: rms   10 max   28 freq    +41 +/-  11 delay   410 +/-   1
ptp4l[22351.767]: rms   10 max   26 freq    +34 +/-  12 delay   410 +/-   1
ptp4l[22415.770]: rms   10 max   26 freq    +49 +/-  14 delay   410 +/-   1

=== Ext. HW_TS and Genf testing:

For testing purposes Time Sync Router (TSR) can be modeled in DT as pin controller
+       timesync_router: timesync_router@A40000 {
+               compatible = "pinctrl-single";
+               reg = <0x0 0xA40000 0x0 0x800>;
+               #address-cells = <1>;
+               #size-cells = <0>;
+               #pinctrl-cells = <1>;
+               pinctrl-single,register-width = <32>;
+               pinctrl-single,function-mask = <0x800007ff>;
+       };

then signals routing can be done in board file, for example:
+#define TS_OFFSET(pa, val)     (0x4+(pa)*4) (0x80000000 | val)
+
+&timesync_router {
+       pinctrl-names = "default";
+       pinctrl-0 = <&mcu_cpts>;
+
+       /* Example of the timesync routing */
+       mcu_cpts: mcu_cpts {
+               pinctrl-single,pins = <
+                       /* [cpts genf1] in13 -> out25 [cpts hw4_push] */
+                       TS_OFFSET(25, 13)
+                       /* [cpts genf1] in13 -> out0 [main cpts hw1_push] */
+                       TS_OFFSET(0, 13)
+                       /* [main cpts genf0] in4 -> out1 [main cpts hw2_push] */
+                       TS_OFFSET(1, 4)
+                       /* [main cpts genf0] in4 -> out24 [cpts hw3_push] */
+                       TS_OFFSET(24, 4)
+               >;
+       };
+};

will create link:
    cpsw cpts Genf1 -> main cpts hw1_push
                    -> cpsw cpts hw4_push

    main cpts Genf0 -> main cpts hw2_push
                    -> cpsw cpts hw3_push

 testptp -d /dev/ptp0 -i 0 -p 1000000000
 periodic output request okay
 testptp -d /dev/ptp0 -i 1 -e 5
 external time stamp request okay
 event index 1 at 22583.000000025
 event index 1 at 22584.000000025
 event index 1 at 22585.000000025
 event index 1 at 22586.000000025
 event index 1 at 22587.000000025
 testptp -d /dev/ptp1 -i 2 -e 5
 external time stamp request okay
 event index 2 at 1587606764.249304554
 event index 2 at 1587606765.249304467
 event index 2 at 1587606766.249304380
 event index 2 at 1587606767.249304293
 event index 2 at 1587606768.249304206

[1] https://www.ti.com/lit/pdf/spracp7
[2] https://www.ti.com/lit/pdf/sprz452
[3] https://www.ti.com/lit/pdf/spruil1
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Add DT node for Main NAVSS CPTS module.
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Add DT node for The TI J721E MCU CPSW CPTS which is part of MCU CPSW NUSS.
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Add DT node for Main NAVSS CPTS module.
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Add DT node for the TI AM65x SoC Common Platform Time Sync (CPTS).
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

The MCU CPSW Common Platform Time Sync (CPTS) provides possibility to
timestamp TX PTP packets and all RX packets.

This enables corresponding support in TI AM65x/J721E MCU CPSW driver.
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

The CPTS module is used to facilitate host control of time sync operations.
Main features of CPTS module are:
- selection of multiple external clock sources
- control of time sync events via interrupt or polling
- 64-bit timestamp mode in ns with HW PPM and nudge adjustment.
- hardware timestamp ext. inputs (HWx_TS_PUSH)
- timestamp Generator function outputs (TS_GENFx)
Depending on integration it enables compliance with the IEEE 1588-2008
standard for a precision clock synchronization protocol, Ethernet Enhanced
Scheduled Traffic Operations (CPTS_ESTFn) and PCIe Subsystem Precision Time
Measurement (PTM).

Introduced driver provides Linux PTP hardware clock for each CPTS device
and network packets timestamping where applicable. CPTS PTP hardware clock
supports following operations:
    - Set time
    - Get time
    - Shift the clock by a given offset atomically
    - Adjust clock frequency
    - Time stamp external events
    - Periodic output signals
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Document device tree bindings for TI AM654/J721E SoC The Common Platform
Time Sync (CPTS) module. The CPTS module is used to facilitate host control
of time sync operations. Main features of CPTS module are:
  - selection of multiple external clock sources
  - 64-bit timestamp mode in ns with ppm and nudge adjustment.
  - control of time sync events via interrupt or polling
  - hardware timestamp of ext. events (HWx_TS_PUSH)
  - periodic generator function outputs (TS_GENFx)
  - PPS in combination with timesync router
  - Depending on integration it enables compliance with the IEEE 1588-2008
standard for a precision clock synchronization protocol, Ethernet Enhanced
Scheduled Traffic Operations (CPTS_ESTFn) and PCIe Subsystem Precision Time
Measurement (PTM).
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Jakub Kicinski says:

====================
devlink: kernel region snapshot id allocation

currently users have to find a free snapshot id to pass
to the kernel when they are requesting a snapshot to be
taken.

This set extends the kernel so it can allocate the id
on its own and send it back to user space in a response.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

In past discussions Jiri explained snapshot ids are cross-region.
Explain this in the docs.

v3: new patch
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Currently users have to choose a free snapshot id before
calling DEVLINK_CMD_REGION_NEW. This is potentially racy
and inconvenient.

Make the DEVLINK_ATTR_REGION_SNAPSHOT_ID optional and try
to allocate id automatically. Send a message back to the
caller with the snapshot info.

Example use:
$ devlink region new netdevsim/netdevsim1/dummy
netdevsim/netdevsim1/dummy: snapshot 1

$ id=$(devlink -j region new netdevsim/netdevsim1/dummy | \
       jq '.[][][][]')
$ devlink region dump netdevsim/netdevsim1/dummy snapshot $id
[...]
$ devlink region del netdevsim/netdevsim1/dummy snapshot $id

v4:
 - inline the notification code
v3:
 - send the notification only once snapshot creation completed.
v2:
 - don't wrap the line containing extack;
 - add a few sentences to the docs.
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

We'll need to send snapshot info back on the socket
which requested a snapshot to be created. Factor out
constructing a snapshot description from the broadcast
notification code.

v3: new patch
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Jiri Pirko <jiri@mellanox.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

QUIC servers would like to use SO_TXTIME, without having CAP_NET_ADMIN,
to efficiently pace UDP packets.

As far as sch_fq is concerned, we need to add safety checks, so
that a buggy application does not fill the qdisc with packets
having delivery time far in the future.

This patch adds a configurable horizon (default: 10 seconds),
and a configurable policy when a packet is beyond the horizon
at enqueue() time:
- either drop the packet (default policy)
- or cap its delivery time to the horizon.

$ tc -s -d qd sh dev eth0
qdisc fq 8022: root refcnt 257 limit 10000p flow_limit 100p buckets 1024
 orphan_mask 1023 quantum 10Kb initial_quantum 51160b low_rate_threshold 550Kbit
 refill_delay 40.0ms timer_slack 10.000us horizon 10.000s
 Sent 1234215879 bytes 837099 pkt (dropped 21, overlimits 0 requeues 6)
 backlog 0b 0p requeues 6
  flows 1191 (inactive 1177 throttled 0)
  gc 0 highprio 0 throttled 692 latency 11.480us
  pkts_too_long 0 alloc_errors 0 horizon_drops 21 horizon_caps 0

v2: fixed an overflow on 32bit kernels in fq_init(), reported
    by kbuild test robot <lkp@intel.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Currently if the default qdisc setup/init fails, the device ends up with
qdisc "noop", which causes all TX packets to get dropped.

With the introduction of sysctl net/core/default_qdisc it is possible
to change the default qdisc to be more advanced, which opens for the
possibility that Qdisc_ops->init() can fail.

This patch detect these kind of failures, and choose to fallback to
qdisc "noqueue", which is so simple that its init call will not fail.
This allows the interface to continue functioning.

V2:
As this also captures memory failures, which are transient, the
device is not kept in IFF_NO_QUEUE state.  This allows the net_device
to retry to default qdisc assignment.
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Alex Elder says:

====================
net: ipa: I/O map SMEM and IMEM

This series adds the definition of two memory regions that must be
mapped for IPA to access through an SMMU.  It requires the SMMU to
be defined in the IPA node in the SoC's Device Tree file.

There is no change since version 1 to the content of the code in
these patches, *however* this time the first patch is an update to
the binding definition rather than an update to a DTS file.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Arrange to use an item from SMEM memory for IPA.  SMEM item number
497 is designated to be used by the IPA.  Specify the item ID and
size of the region in platform configuration data.  Allocate and get
a pointer to this region from ipa_mem_init().  The memory must be
mapped for access through an SMMU.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Define a region of IMEM memory available for use by IPA in the
platform configuration data.  Initialize it from ipa_mem_init().
The memory must be mapped for access through an SMMU.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

The ipa_mem_data structure type was never actually used.  Instead,
the IPA memory regions were defined using the ipa_mem structure.

Redefine struct ipa_mem_data so it encapsulates the array of IPA-local
memory region descriptors along with the count of entries in that
array.  Pass just an ipa_mem structure pointer to ipa_mem_init().

Rename the ipa_mem_data[] array ipa_mem_local_data[] to emphasize
that the memory regions it defines are IPA-local memory.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

The IPA accesses "IMEM" and main system memory through an SMMU, so
its DT node requires an iommus property to define range of stream IDs
it uses.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Heiner Kallweit says:

====================
net: add helper eth_hw_addr_crc

Several drivers use the same code as basis for filter hashes. Therefore
let's factor it out to a helper. This way drivers don't have to access
struct netdev_hw_addr internals.

First user is r8169.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Use new helper eth_hw_addr_crc to simplify the code.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Several drivers use the same code as basis for filter hashes. Therefore
let's factor it out to a helper. This way drivers don't have to access
struct netdev_hw_addr internals.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

If there is no specific configuration of the felix switch in the device
tree, but only the default configuration (ie. given by the SoCs dtsi
file), the probe fails because no CPU port has been set. On the other
hand you cannot set a default CPU port because that depends on the
actual board using the switch.

[    2.701300] DSA: tree 0 has no CPU port
[    2.705167] mscc_felix 0000:00:00.5: Failed to register DSA switch: -22
[    2.711844] mscc_felix: probe of 0000:00:00.5 failed with error -22

Thus let the device tree disable this device entirely, like it is also
done with the enetc driver of the same SoC.
Signed-off-by: Michael Walle <michael@walle.cc>
Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Karsten Graul says:

====================
net/smc: add failover processing

This patch series adds the actual SMC-R link failover processing and
improved link group termination. There will be one more (very small)
series after this which will complete the SMC-R link failover support.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

During SMC-R link establishment the peers exchange the link_uid that
is used for debugging purposes. Save the peer link_uid in smc_link so it
can be retrieved by the smc_diag netlink interface.
Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Reviewed-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

The link_uid of an SMC-R link is exchanged between SMC peers and its
value can be used for debugging purposes. Create a unique link_uid
during link initialization and use it in communication with SMC-R peers.
Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Reviewed-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Add helper smcr_lgr_link_deactivate_all() and eliminate duplicate code.
In smc_lgr_free(), clear the smc-r links before smc_lgr_free_bufs() is
called so buffers are already prepared for free. The usage of the soft
parameter in __smc_lgr_terminate() is no longer needed, smc_lgr_free()
can be called directly. smc_lgr_terminate_sched() and
smc_smcd_terminate() set lgr->freeing to indicate that the link group
will be freed soon to avoid unnecessary schedules of the free worker.
Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Reviewed-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Allow to set the reason code for the link group termination, and set
meaningful values before termination processing is triggered. This
reason code is sent to the peer in the final delete link message.
When the LLC request or response layer receives a message type that was
not handled, drop a warning and terminate the link group.
Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Reviewed-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

New connections must not be assigned to asymmetric links. Add asymmetric
link tagging using new link variable link_is_asym. The new helpers
smcr_lgr_set_type() and smcr_lgr_set_type_asym() are called to set the
state of the link group, and tag all links accordingly.
smcr_lgr_conn_assign_link() respects the link tagging and will not
assign new connections to links tagged as asymmetric link.
Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Reviewed-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

For new connections, assign a link from the link group, using some
simple load balancing.
Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Reviewed-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Add smc_llc_send_message_wait() which uses smc_wr_tx_send_wait() to send
an LLC message and waits for the message send to complete.
smc_llc_send_link_delete_all() calls the new function to send an
DELETE_LINK,ALL LLC message. The RFC states that the sender of this type
of message needs to wait for the completion event of the message
transmission and can terminate the link afterwards.
Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Reviewed-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Introduce smc_wr_tx_send_wait() to send an IB message and wait for the
tx completion event of the message. This makes sure that the message is
no longer in-flight when the function returns.
Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Reviewed-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Call smc_cdc_msg_validate() when a CDC message with the failover
validation bit enabled was received. Validate that the sequence number
sent with the message is one we already have received. If not, messages
were lost and the connection is terminated using a new abort_work.
Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Reviewed-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

When a connection is switched to a new link then a link validation
message must be sent to the peer over the new link, containing the
sequence number of the last CDC message that was sent over the old link.
The peer will validate if this sequence number is the same or lower then
the number he received, and abort the connection if messages were lost.
Add smcr_cdc_msg_send_validation() to send the message validation
message and call it when a connection was switched in
smc_switch_cursor().
Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Reviewed-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Add smc_switch_conns() to switch all connections from a link that is
going down. Find an other link to switch the connections to, and
switch each connection to the new link. smc_switch_cursor() updates the
cursors of a connection to the state of the last successfully sent CDC
message. When there is no link to switch to, terminate the link group.
Call smc_switch_conns() when a link is going down.
And with the possibility that links of connections can switch adapt CDC
and TX functions to detect and handle link switches.
Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Reviewed-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

When a link goes down and all connections of this link need to be
switched to an other link then the producer cursor and the sequence of
the last successfully sent CDC message must be known. Add the two fields
to the SMC connection and update it in the tx completion handler.
And to allow matching of sequences in error cases reset the seqno to the
old value in smc_cdc_msg_send() when the actual send failed.
Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Reviewed-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>