tipc_bcast_unlock need to be unlocked in error path.
Signed-off-by: NInsu Yun <wuninsu@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Antonio Quartulli says:

====================
Two of the fixes included in this patchset prevent wrong memory
access - it was triggered when removing an object from a list
after it was already free'd due to bad reference counting.
This misbehaviour existed for both the gw_node and the
orig_node_vlan object and has been fixed by Sven Eckelmann.

The last patch fixes our interface feasibility check and prevents
it from looping indefinitely when two net_device objects
reference each other via iflink index (i.e. veth pair), by
Andrew Lunn
====================
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

An error response from a RTM_GETNETCONF request can return the positive
error value EINVAL in the struct nlmsgerr that can mislead userspace.
Signed-off-by: NAnton Protopopov <a.s.protopopov@gmail.com>
Acked-by: NCong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

When I used netdev_for_each_lower_dev in commit bad53162 ("vrf:
remove slave queue and private slave struct") I thought that it acts
like netdev_for_each_lower_private and can be used to remove the current
device from the list while walking, but unfortunately it acts more like
netdev_for_each_lower_private_rcu and doesn't allow it. The difference
is where the "iter" points to, right now it points to the current element
and that makes it impossible to remove it. Change the logic to be
similar to netdev_for_each_lower_private and make it point to the "next"
element so we can safely delete the current one. VRF is the only such
user right now, there's no change for the read-only users.

Here's what can happen now:
[98423.249858] general protection fault: 0000 [#1] SMP
[98423.250175] Modules linked in: vrf bridge(O) stp llc nfsd auth_rpcgss
oid_registry nfs_acl nfs lockd grace sunrpc crct10dif_pclmul
crc32_pclmul crc32c_intel ghash_clmulni_intel jitterentropy_rng
sha256_generic hmac drbg ppdev aesni_intel aes_x86_64 glue_helper lrw
gf128mul ablk_helper cryptd evdev serio_raw pcspkr virtio_balloon
parport_pc parport i2c_piix4 i2c_core virtio_console acpi_cpufreq button
9pnet_virtio 9p 9pnet fscache ipv6 autofs4 ext4 crc16 mbcache jbd2 sg
virtio_blk virtio_net sr_mod cdrom e1000 ata_generic ehci_pci uhci_hcd
ehci_hcd usbcore usb_common virtio_pci ata_piix libata floppy
virtio_ring virtio scsi_mod [last unloaded: bridge]
[98423.255040] CPU: 1 PID: 14173 Comm: ip Tainted: G           O
4.5.0-rc2+ #81
[98423.255386] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996),
BIOS 1.8.1-20150318_183358- 04/01/2014
[98423.255777] task: ffff8800547f5540 ti: ffff88003428c000 task.ti:
ffff88003428c000
[98423.256123] RIP: 0010:[<ffffffff81514f3e>]  [<ffffffff81514f3e>]
netdev_lower_get_next+0x1e/0x30
[98423.256534] RSP: 0018:ffff88003428f940  EFLAGS: 00010207
[98423.256766] RAX: 0002000100000004 RBX: ffff880054ff9000 RCX:
0000000000000000
[98423.257039] RDX: ffff88003428f8b8 RSI: ffff88003428f950 RDI:
ffff880054ff90c0
[98423.257287] RBP: ffff88003428f940 R08: 0000000000000000 R09:
0000000000000000
[98423.257537] R10: 0000000000000001 R11: 0000000000000000 R12:
ffff88003428f9e0
[98423.257802] R13: ffff880054a5fd00 R14: ffff88003428f970 R15:
0000000000000001
[98423.258055] FS:  00007f3d76881700(0000) GS:ffff88005d000000(0000)
knlGS:0000000000000000
[98423.258418] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[98423.258650] CR2: 00007ffe5951ffa8 CR3: 0000000052077000 CR4:
00000000000406e0
[98423.258902] Stack:
[98423.259075]  ffff88003428f960 ffffffffa0442636 0002000100000004
ffff880054ff9000
[98423.259647]  ffff88003428f9b0 ffffffff81518205 ffff880054ff9000
ffff88003428f978
[98423.260208]  ffff88003428f978 ffff88003428f9e0 ffff88003428f9e0
ffff880035b35f00
[98423.260739] Call Trace:
[98423.260920]  [<ffffffffa0442636>] vrf_dev_uninit+0x76/0xa0 [vrf]
[98423.261156]  [<ffffffff81518205>]
rollback_registered_many+0x205/0x390
[98423.261401]  [<ffffffff815183ec>] unregister_netdevice_many+0x1c/0x70
[98423.261641]  [<ffffffff8153223c>] rtnl_delete_link+0x3c/0x50
[98423.271557]  [<ffffffff815335bb>] rtnl_dellink+0xcb/0x1d0
[98423.271800]  [<ffffffff811cd7da>] ? __inc_zone_state+0x4a/0x90
[98423.272049]  [<ffffffff815337b4>] rtnetlink_rcv_msg+0x84/0x200
[98423.272279]  [<ffffffff810cfe7d>] ? trace_hardirqs_on+0xd/0x10
[98423.272513]  [<ffffffff8153370b>] ? rtnetlink_rcv+0x1b/0x40
[98423.272755]  [<ffffffff81533730>] ? rtnetlink_rcv+0x40/0x40
[98423.272983]  [<ffffffff8155d6e7>] netlink_rcv_skb+0x97/0xb0
[98423.273209]  [<ffffffff8153371a>] rtnetlink_rcv+0x2a/0x40
[98423.273476]  [<ffffffff8155ce8b>] netlink_unicast+0x11b/0x1a0
[98423.273710]  [<ffffffff8155d2f1>] netlink_sendmsg+0x3e1/0x610
[98423.273947]  [<ffffffff814fbc98>] sock_sendmsg+0x38/0x70
[98423.274175]  [<ffffffff814fc253>] ___sys_sendmsg+0x2e3/0x2f0
[98423.274416]  [<ffffffff810d841e>] ? do_raw_spin_unlock+0xbe/0x140
[98423.274658]  [<ffffffff811e1bec>] ? handle_mm_fault+0x26c/0x2210
[98423.274894]  [<ffffffff811e19cd>] ? handle_mm_fault+0x4d/0x2210
[98423.275130]  [<ffffffff81269611>] ? __fget_light+0x91/0xb0
[98423.275365]  [<ffffffff814fcd42>] __sys_sendmsg+0x42/0x80
[98423.275595]  [<ffffffff814fcd92>] SyS_sendmsg+0x12/0x20
[98423.275827]  [<ffffffff81611bb6>] entry_SYSCALL_64_fastpath+0x16/0x7a
[98423.276073] Code: c3 31 c0 5d c3 0f 1f 84 00 00 00 00 00 66 66 66 66
90 48 8b 06 55 48 81 c7 c0 00 00 00 48 89 e5 48 8b 00 48 39 f8 74 09 48
89 06 <48> 8b 40 e8 5d c3 31 c0 5d c3 0f 1f 84 00 00 00 00 00 66 66 66
[98423.279639] RIP  [<ffffffff81514f3e>] netdev_lower_get_next+0x1e/0x30
[98423.279920]  RSP <ffff88003428f940>

CC: David Ahern <dsa@cumulusnetworks.com>
CC: David S. Miller <davem@davemloft.net>
CC: Roopa Prabhu <roopa@cumulusnetworks.com>
CC: Vlad Yasevich <vyasevic@redhat.com>
Fixes: bad53162 ("vrf: remove slave queue and private slave struct")
Signed-off-by: NNikolay Aleksandrov <nikolay@cumulusnetworks.com>
Reviewed-by: NDavid Ahern <dsa@cumulusnetworks.com>
Tested-by: NDavid Ahern <dsa@cumulusnetworks.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

This avoids a harmless randconfig warning I get when USB_NET_CDC_SUBSET
is enabled, but all of the more specific drivers are not:

drivers/net/usb/cdc_subset.c:241:2: #warning You need to configure some hardware for this driver

The current behavior is clearly intentional, giving a warning when
a user picks a configuration that won't do anything good. The only
reason for even addressing this is that I'm getting close to
eliminating all 'randconfig' warnings on ARM, and this came up
a couple of times.

My workaround is to not even build the module when none of the
configurations are enable.

Alternatively we could simply remove the #warning (nothing wrong
for compile-testing), turn it into a runtime warning, or
change the Kconfig options into a menu to hide CONFIG_USB_NET_CDC_SUBSET.
Signed-off-by: NArnd Bergmann <arnd@arndb.de>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

In metadata mode, the vxlan interface is not supposed to use the fdb control
plane but an external one (openvswitch or static routes). With the current
code, packets may leak into the fdb handling code which usually causes them
to be dropped anyway but may have strange side effects.

Just drop the packets directly when in metadata mode if the destination data
are not correctly provided on egress.
Signed-off-by: NJiri Benc <jbenc@redhat.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

A return value of the bchannel_get_rxbuf() function is compared with the
positive ENOMEM value instead of the negative -ENOMEM value to detect a
memory allocation problem. Thus, after a possible memory allocation
failure the bc->bch.rx_skb will be NULL which will lead to a NULL
pointer dereference.
Signed-off-by: NAnton Protopopov <a.s.protopopov@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

The cfrfml_receive() function might return positive value EPROTO
Signed-off-by: NAnton Protopopov <a.s.protopopov@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

The atalk_sendmsg() function might return wrong value ENETUNREACH
instead of -ENETUNREACH.
Signed-off-by: NAnton Protopopov <a.s.protopopov@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Failure of kzalloc should cause the enclosing function
to return -ENOMEM, not -ENODEV.

Additionally, removed the following checkpatch warnings:
ERROR: spaces required around that '==' (ctx:VxV)
ERROR: space required before the open parenthesis '('
CHECK: Comparison to NULL could be written "!lp"
Signed-off-by: NAmitoj Kaur Chawla <amitoj1606@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

My implementation around IFF_NO_QUEUE driver flag assumed that leaving
tx_queue_len untouched (specifically: not setting it to zero) by drivers
would make it possible to assign a regular qdisc to them without having
to worry about setting tx_queue_len to a useful value. This was only
partially true: I overlooked that some drivers don't call ether_setup()
and therefore not initialize tx_queue_len to the default value of 1000.
Consequently, removing the workarounds in place for that case in qdisc
implementations which cared about it (namely, pfifo, bfifo, gred, htb,
plug and sfb) leads to problems with these specific interface types and
qdiscs.

Luckily, there's already a sanitization point for drivers setting
tx_queue_len to zero, which can be reused to assign the fallback value
most qdisc implementations used, which is 1.

Fixes: 348e3435 ("net: sched: drop all special handling of tx_queue_len == 0")
Tested-by: NMathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: NPhil Sutter <phil@nwl.cc>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

ether_setup sets IFF_TX_SKB_SHARING but this is not supported by gre
as it modifies the skb on xmit.

Also, clean up whitespace in ipgre_tap_setup when we're already touching it.
Signed-off-by: NJiri Benc <jbenc@redhat.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

ether_setup sets IFF_TX_SKB_SHARING but this is not supported by
geneve as it modifies the skb on xmit.
Signed-off-by: NJiri Benc <jbenc@redhat.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

ether_setup sets IFF_TX_SKB_SHARING but this is not supported by vxlan
as it modifies the skb on xmit.
Signed-off-by: NJiri Benc <jbenc@redhat.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Calculate the maximum MTU taking into account the size of headers
involved in GENEVE encapsulation, as for other tunnel types.

Changes in v3:
- Correct comment style
Changes in v2:
- Conform more closely to ip_tunnel_change_mtu
- Exclude GENEVE options from max MTU calculation
Signed-off-by: NDavid Wragg <david@weave.works>
Acked-by: NJesse Gross <jesse@kernel.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Ilya reported following lockdep splat:

kernel: =========================
kernel: [ BUG: held lock freed! ]
kernel: 4.5.0-rc1-ceph-00026-g5e0a311 #1 Not tainted
kernel: -------------------------
kernel: swapper/5/0 is freeing memory
ffff880035c9d200-ffff880035c9dbff, with a lock still held there!
kernel: (&(&queue->rskq_lock)->rlock){+.-...}, at:
[<ffffffff816f6a88>] inet_csk_reqsk_queue_add+0x28/0xa0
kernel: 4 locks held by swapper/5/0:
kernel: #0:  (rcu_read_lock){......}, at: [<ffffffff8169ef6b>]
netif_receive_skb_internal+0x4b/0x1f0
kernel: #1:  (rcu_read_lock){......}, at: [<ffffffff816e977f>]
ip_local_deliver_finish+0x3f/0x380
kernel: #2:  (slock-AF_INET){+.-...}, at: [<ffffffff81685ffb>]
sk_clone_lock+0x19b/0x440
kernel: #3:  (&(&queue->rskq_lock)->rlock){+.-...}, at:
[<ffffffff816f6a88>] inet_csk_reqsk_queue_add+0x28/0xa0

To properly fix this issue, inet_csk_reqsk_queue_add() needs
to return to its callers if the child as been queued
into accept queue.

We also need to make sure listener is still there before
calling sk->sk_data_ready(), by holding a reference on it,
since the reference carried by the child can disappear as
soon as the child is put on accept queue.
Reported-by: NIlya Dryomov <idryomov@gmail.com>
Fixes: ebb516af ("tcp/dccp: fix race at listener dismantle phase")
Signed-off-by: NEric Dumazet <edumazet@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Since the gc of ipv4 route was removed, the route cached would has
no chance to be removed, and even it has been timeout, it still could
be used, cause no code to check it's expires.

Fix this issue by checking  and removing route cache when we get route.
Signed-off-by: NXin Long <lucien.xin@gmail.com>
Acked-by: NHannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

actions could change the etherproto in particular with ethernet
tunnelled data. Typically such actions, after peeling the outer header,
will ask for the packet to be  reclassified. We then need to restart
the classification with the new proto header.

Example setup used to catch this:
sudo tc qdisc add dev $ETH ingress
sudo $TC filter add dev $ETH parent ffff: pref 1 protocol 802.1Q \
u32 match u32 0 0 flowid 1:1 \
action  vlan pop reclassify

Fixes: 3b3ae880 ("net: sched: consolidate tc_classify{,_compat}")
Signed-off-by: NJamal Hadi Salim <jhs@mojatatu.com>
Acked-by: NDaniel Borkmann <daniel@iogearbox.net>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Jiri Pirko says:

====================
mlxsw fixes

Another bulk of fixes from Ido.
====================
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

When PVID is toggled off on a port member in a VLAN filtering bridge or
the PVID VLAN is deleted, make the port drop untagged packets. Reverse
the operation when PVID is toggled back on.

Set the PVID back to the default (1), when leaving the bridge so that
untagged traffic will be directed to the CPU.

Fixes: 56ade8fe ("mlxsw: spectrum: Add initial support for Spectrum ASIC")
Signed-off-by: NIdo Schimmel <idosch@mellanox.com>
Signed-off-by: NJiri Pirko <jiri@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

When VLAN filtering is enabled on a bridge and PVID is deleted from a
bridge port, then untagged frames are not allowed to ingress into the
bridge from this port.

Add the Switch Port Acceptable Frame Types (SPAFT) register, which
configures the frame admittance of the port.

Fixes: 56ade8fe ("mlxsw: spectrum: Add initial support for Spectrum ASIC")
Signed-off-by: NIdo Schimmel <idosch@mellanox.com>
Signed-off-by: NJiri Pirko <jiri@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

For error handling, dma_alloc_coherent's return value
needs to be checked, not argument.
Signed-off-by: NInsu Yun <wuninsu@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Sunil Goutham says:

====================
net: thunderx: Miscellaneous fixes

This patch series fixes couple of issues w.r.t multiqset mode
and receive packet statastics.
====================
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Counting rx packets for every CQE_RX in CQ irq handler is incorrect.
Synchronization is missing when multiple queues are receiving packets
simultaneously. Like transmit packet stats use HW stats here.

Also removed unused 'cqe_type' parameter in nicvf_rcv_pkt_handler().
Signed-off-by: NSunil Goutham <sgoutham@cavium.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

For secondary Qsets 'hw_tso' is not getting set as probe() returns
much earlier. Fixed it by moving silicon revision check.
Signed-off-by: NSunil Goutham <sgoutham@cavium.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

When a interface is assigned morethan 8 queues and the logical interface
is toggled i.e down & up, additional queues or qsets are not initialized
as secondary qset count is being set to zero while tearing down.
Signed-off-by: NSunil Goutham <sgoutham@cavium.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

crypto_alloc_hash never returns NULL
Signed-off-by: NInsu Yun <wuninsu@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

With commit 0071f56e ("dsa: Register netdev before phy"), we are now trying
to free a network device that has been previously registered, and in case of
errors, this will make us hit the BUG_ON(dev->reg_state != NETREG_UNREGISTERED)
condition.

Fix this by adding a missing unregister_netdev() before free_netdev().

Fixes: 0071f56e ("dsa: Register netdev before phy")
Signed-off-by: NFlorian Fainelli <f.fainelli@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

For the Marvell 88E1510, marvell_of_reg_init was called too late, in the
config_aneg function.
Since commit 113c74d8 ("net: phy: turn carrier off on phy attach"),
this lead to the link not coming up at boot anymore, due to the phy
state machine being stuck at waiting for interrupts (off by default on
the 88E1510).
For seven other Marvell PHYs, marvell_of_reg_init was not called at all.

Add a generic marvell_config_init function, which in turn calls
marvell_of_reg_init.
PHYs, which already have a specific config_init function with a call to
marvell_of_reg_init, are left untouched. The generic marvell_config_init
function is called for all the others, to get consistent behavior across
all Marvell PHYs.

Fixes: 113c74d8 ("net: phy: turn carrier off on phy attach")
Signed-off-by: NClemens Gruber <clemens.gruber@pqgruber.com>
Reviewed-by: NAndrew Lunn <andrew@lunn.ch>
Reviewed-by: NFlorian Fainelli <f.fainelli@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Drop reference on the relay_po socket when __pppoe_xmit() succeeds.
This is already handled correctly in the error path.
Signed-off-by: NGuillaume Nault <g.nault@alphalink.fr>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

The example in the DT binding documentation uses the preliminary DT
bindings for the r8a7795 MSTP clocks, which never went upstream.
Update the example to use the DT bindings for the upstream Clock Pulse
Generator / Module Standby and Software Reset hardware block.
Signed-off-by: NGeert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: NSimon Horman <horms+renesas@verge.net.au>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Jiri Pirko says:

====================
mlxsw fixes

Just a couple of fixes from Ido.
====================
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

When a VLAN device leaves a bridge its STP state is set to DISABLED,
which causes the hardware to discard any packets coming through the port
with this VLAN.

Fix that by setting STP state to FORWARDING when the device leaves its
bridge and allow traffic to be directed to CPU.

Fixes: 26f0e7fb ("mlxsw: spectrum: Add support for VLAN devices bridging")
Reported-by: NElad Raz <eladr@mellanox.com>
Signed-off-by: NIdo Schimmel <idosch@mellanox.com>
Signed-off-by: NJiri Pirko <jiri@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

MLXSW_PORT_MAX_PORTS represents the maximum number of local ports, which
is 65 for both ASICs (SwitchX-2 and Spectrum) supported by this driver.

Fixes: 93c1edb2 ("mlxsw: Introduce Mellanox switch driver core")
Signed-off-by: NIdo Schimmel <idosch@mellanox.com>
Signed-off-by: NJiri Pirko <jiri@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

A previous commit (33f72e6f) added notification via netlink for tunnels
when created/modified/deleted. If the notification returned an error,
this error was returned from the tunnel function. If there were no
listeners, the error code ESRCH was returned, even though having no
listeners is not an error. Other calls to this and other similar
notification functions either ignore the error code, or filter ESRCH.
This patch checks for ESRCH and does not flag this as an error.
Reviewed-by: NHamish Martin <hamish.martin@alliedtelesis.co.nz>
Signed-off-by: NMark Tomlinson <mark.tomlinson@alliedtelesis.co.nz>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

The cpsw-phy-sel driver supports only MII, RMII, and RGMII PHY modes,
and silently handled any other values as if MII was specified. In a
case where the PHY mode was incorrectly specified, or a bug elsewhere,
there would be no indication of a problem. If MII was the correct mode,
then this will go unnoticed, otherwise the symptom will be a failure
to transmit/receive data over the RMII/RGMII link.

Add a dev_warn() to make this condition obvious and provide a
breadcrumb to follow.

Cc: Mugunthan V N <mugunthanvnm@ti.com>
Signed-off-by: NDavid Rivshin <drivshin@allworx.com>
Acked-by: NMugunthan V N <mugunthanvnm@ti.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

genphy_config_init() masked out pause flags set in phy driver structure.
Pause flags needs to be preserved in phydev->supported &
phydev->advertising.
Signed-off-by: NWoojung Huh <woojung.huh@microchip.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Or Gerlitz says:

====================
Mellanox 10/40G mlx4 driver fixes for 4.5-rc

Bunch of fixes from the team to the mlx4 Eth and core drivers.

Series generated against net commit aac8d3c2 "qmi_wwan: add "4G LTE usb-modem U901""

Please push patches 1,2 and 6 to -stable  as well

changes from v0:
 - handled another wrongly accounted HW counter in patch #1 (Rick)
 - fixed coding style issues in patch #4 (Sergei)
====================
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

It's forbidden to manually change dev->features in run-time. Currently, this is
done in the driver to make sure that GSO_UDP_TUNNEL is advertized only when
VXLAN tunnel is set. However, since the stack actually does features intersection
with hw_enc_features, we can safely revert to advertizing features early when
registering the netdevice.

Fixes: f4a1edd5 ('net/mlx4_en: Advertize encapsulation offloads [...]')
Signed-off-by: NEugenia Emantayev <eugenia@mellanox.com>
Signed-off-by: NOr Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

problem description:

The current code sets UAR page size equal to system page size.
The ConnectX-3 and ConnectX-3 Pro HWs require minimum 128 UAR pages.
The mlx4 kernel drivers are not loaded if there is less than 128 UAR pages.

solution:

Always set UAR page to 4KB. This allows more UAR pages if the OS
has PAGE_SIZE larger than 4KB. For example, PowerPC kernel use 64KB
system page size, with 4MB uar region, there are 4MB/2/64KB = 32
uars (half for uar, half for blueflame). This does not meet minimum 128
UAR pages requirement. With 4KB UAR page, there are 4MB/2/4KB = 512 uars
which meet the minimum requirement.

Note that only codes in mlx4_core that deal with firmware know that uar
page size is 4KB. Codes that deal with usr page in cq and qp context
(mlx4_ib, mlx4_en and part of mlx4_core) still have the same assumption
that uar page size equals to system page size.

Note that with this implementation, on 64KB system page size kernel, there
are 16 uars per system page but only one uars is used. The other 15
uars are ignored because of the above assumption.

Regarding SR-IOV, mlx4_core in hypervisor will set the uar page size
to 4KB and mlx4_core code in virtual OS will obtain the uar page size from
firmware.

Regarding backward compatibility in SR-IOV, if hypervisor has this new code,
the virtual OS must be updated. If hypervisor has old code, and the virtual
OS has this new code, the new code will be backward compatible with the
old code. If the uar size is big enough, this new code in VF continues to
work with 64 KB uar page size (on PowerPc kernel). If the uar size does not
meet 128 uars requirement, this new code not loaded in VF and print the same
error message as the old code in Hypervisor.
Signed-off-by: NHuy Nguyen <huyn@mellanox.com>
Reviewed-by: NYishai Hadas <yishaih@mellanox.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>