The hdr_offset variable is only if we deal with a TCP or UDP packet,
but as the check surrounding its usage tests for skb_is_gso()
instead, the compiler has no idea if the variable is initialized
or not at that point:

drivers/net/hyperv/netvsc_drv.c: In function ‘netvsc_start_xmit’:
drivers/net/hyperv/netvsc_drv.c:494:42: error: ‘hdr_offset’ may be used uninitialized in this function [-Werror=maybe-uninitialized]

This adds an additional check for the transport type, which
tells the compiler that this path cannot happen. Since the
get_net_transport_info() function should always be inlined
here, I don't expect this to result in additional runtime
checks.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

gcc found a reference to an uninitialized variable in the error handling
of bcm_enet_open, introduced by a recent cleanup:

drivers/net/ethernet/broadcom/bcm63xx_enet.c: In function 'bcm_enet_open'
drivers/net/ethernet/broadcom/bcm63xx_enet.c:1129:2: warning: 'phydev' may be used uninitialized in this function [-Wmaybe-uninitialized]

This makes the use of that variable conditional, so we only reference it
here after it has been used before. Unlike my normal patches, I have not
build-tested this one, as I don't currently have mips test in my
randconfig setup.

Fixes: 625eb866 ("net: ethernet: broadcom: bcm63xx: use phydev from struct net_device")
Cc: Philippe Reynes <tremyfr@gmail.com>
Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

reuseport_add_sock() is not used from a module,
no need to export it.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

It is possible for the MTU to be changed during the initialization
process with the VNIC Server.  Ensure that the net device is updated
to reflect the new MTU.
Signed-off-by: Thomas Falcon <tlfalcon@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Signed-off-by: Thomas Falcon <tlfalcon@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Increment driver version to reflect features that have
been added since release.
Signed-off-by: Thomas Falcon <tlfalcon@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Satish reported a problem with the perm multicast router ports not getting
reenabled after some series of events, in particular if it happens that the
multicast snooping has been disabled and the port goes to disabled state
then it will be deleted from the router port list, but if it moves into
non-disabled state it will not be re-added because the mcast snooping is
still disabled, and enabling snooping later does nothing.

Here are the steps to reproduce, setup br0 with snooping enabled and eth1
added as a perm router (multicast_router = 2):
1. $ echo 0 > /sys/class/net/br0/bridge/multicast_snooping
2. $ ip l set eth1 down
^ This step deletes the interface from the router list
3. $ ip l set eth1 up
^ This step does not add it again because mcast snooping is disabled
4. $ echo 1 > /sys/class/net/br0/bridge/multicast_snooping
5. $ bridge -d -s mdb show
<empty>

At this point we have mcast enabled and eth1 as a perm router (value = 2)
but it is not in the router list which is incorrect.

After this change:
1. $ echo 0 > /sys/class/net/br0/bridge/multicast_snooping
2. $ ip l set eth1 down
^ This step deletes the interface from the router list
3. $ ip l set eth1 up
^ This step does not add it again because mcast snooping is disabled
4. $ echo 1 > /sys/class/net/br0/bridge/multicast_snooping
5. $ bridge -d -s mdb show
router ports on br0: eth1

Note: we can directly do br_multicast_enable_port for all because the
querier timer already has checks for the port state and will simply
expire if it's in blocking/disabled. See the comment added by
commit 9aa66382 ("bridge: multicast: add a comment to
br_port_state_selection about blocking state")

Fixes: 561f1103 ("bridge: Add multicast_snooping sysfs toggle")
Reported-by: Satish Ashok <sashok@cumulusnetworks.com>
Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Remove the unused but set variable icsk in listening_get_next to fix the
following GCC warning when building with 'W=1':

  net/ipv4/tcp_ipv4.c: In function ‘listening_get_next’:
  net/ipv4/tcp_ipv4.c:1890:31: warning: variable ‘icsk’ set but not used [-Wunused-but-set-variable]
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

Do not let number of offload queue sets to go more than
MAX_OFLD_QSETS, which would otherwise crash the driver
on machines with cores more than MAX_OFLD_QSETS.
Signed-off-by: Ganesh Goudar <ganeshgr@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Remove the unused but set variable dev in ip_do_fragment to fix the
following GCC warning when building with 'W=1':

  net/ipv4/ip_output.c: In function ‘ip_do_fragment’:
  net/ipv4/ip_output.c:541:21: warning: variable ‘dev’ set but not used [-Wunused-but-set-variable]
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

Allow autoneg to enable flow control by default.
The behavior when autoneg is off has not changed.
Signed-off-by: Niklas Cassel <niklas.cassel@axis.com>
Signed-off-by: Jesper Nilsson <jespern@axis.com>
Acked-by: Lars Persson <larper@axis.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

phy_device->supported is originally set by the PHY driver.
The ethernet driver should filter phy_device->supported to only contain
flags supported by the IP.
The IP supports setting rx and tx flow control independently,
therefore SUPPORTED_Pause and SUPPORTED_Asym_Pause should not be cleared.
If the flags are cleared, pause frames cannot be enabled (even if they
are supported by the PHY).
Signed-off-by: Niklas Cassel <niklas.cassel@axis.com>
Signed-off-by: Jesper Nilsson <jespern@axis.com>
Acked-by: Lars Persson <larper@axis.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Remove the unused but set variable master_dev in check_local_dest to fix
the following GCC warning when building with 'W=1':

  net/hsr/hsr_forward.c: In function ‘check_local_dest’:
  net/hsr/hsr_forward.c:303:21: warning: variable ‘master_dev’ set but not used [-Wunused-but-set-variable]
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

Merge tag 'mac80211-for-davem-2016-10-18' of git://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211

Johannes Berg says:

====================
This is relatively small, mostly to get the SG/crypto
from stack removal fix that crashes things when VMAP
stack is used in conjunction with software crypto.

Aside from that, we have:
 * a fix for AP_VLAN usage with the nl80211 frame command
 * two fixes (and two preparation patches) for A-MSDU, one
   to discard group-addressed (multicast) and unexpected
   4-address A-MSDUs, the other to validate A-MSDU inner
   MAC addresses properly to prevent controlled port bypass
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Functions bnx2_reg_rd_ind(), bnx2_reg_wr_ind() and bnx2_ctx_wr()
can be called with IRQs disabled when netconsole is enabled. So they
should use spin_{,un}lock_irq{save,restore} instead of _bh variants.

Example call flow:
bnx2_poll()
  ->bnx2_poll_link()
    ->bnx2_phy_int()
      ->bnx2_set_remote_link()
        ->bnx2_shmem_rd()
          ->bnx2_reg_rd_ind()
            -> spin_lock_bh(&bp->indirect_lock);
               spin_unlock_bh(&bp->indirect_lock);
               ...
               -> __local_bh_enable_ip

static inline void __local_bh_enable_ip(unsigned long ip)
      WARN_ON_ONCE(in_irq() || irqs_disabled());   <<<<<< WARN

Cc: Sony Chacko <sony.chacko@qlogic.com>
Cc: Dept-HSGLinuxNICDev@qlogic.com
Signed-off-by: Ivan Vecera <ivecera@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Javier Martinez Canillas says:

====================
net: Fix module autoload for several platform drivers

I noticed that module autoload won't be working in a bunch of platform
drivers in the net subsystem and this patch series contains the fixes.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

If the driver is built as a module, autoload won't work because the module
alias information is not filled. So user-space can't match the registered
device with the corresponding module.

Export the module alias information using the MODULE_DEVICE_TABLE() macro.

Before this patch:

$ modinfo drivers/net/dsa/bcm_sf2.ko | grep alias
alias:          platform:brcm-sf2

After this patch:

$ modinfo drivers/net/dsa/bcm_sf2.ko | grep alias
alias:          platform:brcm-sf2
alias:          of:N*T*Cbrcm,bcm7445-switch-v4.0C*
alias:          of:N*T*Cbrcm,bcm7445-switch-v4.0
Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

If the driver is built as a module, autoload won't work because the module
alias information is not filled. So user-space can't match the registered
device with the corresponding module.

Export the module alias information using the MODULE_DEVICE_TABLE() macro.

Before this patch:

$ modinfo drivers/net/dsa/b53/b53_mmap.ko  | grep alias
$

After this patch:

$ modinfo drivers/net/dsa/b53/b53_mmap.ko  | grep alias
alias:          of:N*T*Cbrcm,bcm63xx-switchC*
alias:          of:N*T*Cbrcm,bcm63xx-switch
alias:          of:N*T*Cbrcm,bcm6368-switchC*
alias:          of:N*T*Cbrcm,bcm6368-switch
alias:          of:N*T*Cbrcm,bcm6328-switchC*
alias:          of:N*T*Cbrcm,bcm6328-switch
alias:          of:N*T*Cbrcm,bcm3384-switchC*
alias:          of:N*T*Cbrcm,bcm3384-switch
Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

If the driver is built as a module, autoload won't work because the module
alias information is not filled. So user-space can't match the registered
device with the corresponding module.

Export the module alias information using the MODULE_DEVICE_TABLE() macro.

Before this patch:

$ modinfo drivers/net/ethernet/hisilicon//hns_mdio.ko | grep alias
alias:          platform:Hi-HNS_MDIO
alias:          acpi*:HISI0141:*

After this patch:

$ modinfo drivers/net/ethernet/hisilicon//hns_mdio.ko | grep alias
alias:          platform:Hi-HNS_MDIO
alias:          of:N*T*Chisilicon,hns-mdioC*
alias:          of:N*T*Chisilicon,hns-mdio
alias:          of:N*T*Chisilicon,mdioC*
alias:          of:N*T*Chisilicon,mdio
alias:          acpi*:HISI0141:*
Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

If the driver is built as a module, autoload won't work because the module
alias information is not filled. So user-space can't match the registered
device with the corresponding module.

Export the module alias information using the MODULE_DEVICE_TABLE() macro.

Before this patch:

$ modinfo drivers/net/ethernet/qualcomm/emac/qcom-emac.ko | grep alias
alias:          platform:qcom-emac

After this patch:

$ modinfo drivers/net/ethernet/qualcomm/emac/qcom-emac.ko | grep alias
alias:          platform:qcom-emac
alias:          of:N*T*Cqcom,fsm9900-emacC*
alias:          of:N*T*Cqcom,fsm9900-emac
Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Acked-by: Timur Tabi <timur@codeaurora.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

If the driver is built as a module, autoload won't work because the module
alias information is not filled. So user-space can't match the registered
device with the corresponding module.

Export the module alias information using the MODULE_DEVICE_TABLE() macro.

Before this patch:

$ modinfo drivers/net/ethernet/hisilicon/hns/hns_dsaf.ko | grep alias
alias:          acpi*:HISI00B2:*
alias:          acpi*:HISI00B1:*

After this patch:

$ modinfo drivers/net/ethernet/hisilicon/hns/hns_dsaf.ko | grep alias
alias:          acpi*:HISI00B2:*
alias:          acpi*:HISI00B1:*
alias:          of:N*T*Chisilicon,hns-dsaf-v2C*
alias:          of:N*T*Chisilicon,hns-dsaf-v2
alias:          of:N*T*Chisilicon,hns-dsaf-v1C*
alias:          of:N*T*Chisilicon,hns-dsaf-v1
Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

If the driver is built as a module, autoload won't work because the module
alias information is not filled. So user-space can't match the registered
device with the corresponding module.

Export the module alias information using the MODULE_DEVICE_TABLE() macro.

Before this patch:

$ $ modinfo drivers/net/ethernet/aurora/nb8800.ko | grep alias
$

After this patch:

$ modinfo drivers/net/ethernet/aurora/nb8800.ko | grep alias
alias:          of:N*T*Csigma,smp8734-ethernetC*
alias:          of:N*T*Csigma,smp8734-ethernet
alias:          of:N*T*Csigma,smp8642-ethernetC*
alias:          of:N*T*Csigma,smp8642-ethernet
alias:          of:N*T*Caurora,nb8800C*
alias:          of:N*T*Caurora,nb8800
Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Acked-by: Mans Rullgard <mans@mansr.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

If the driver is built as a module, autoload won't work because the module
alias information is not filled. So user-space can't match the registered
device with the corresponding module.

Export the module alias information using the MODULE_DEVICE_TABLE() macro.

Before this patch:

$ modinfo drivers/net/ethernet/ezchip/nps_enet.ko | grep alias
$

After this patch:

$ modinfo drivers/net/ethernet/ezchip/nps_enet.ko | grep alias
alias:          of:N*T*Cezchip,nps-mgt-enetC*
alias:          of:N*T*Cezchip,nps-mgt-enet
Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

A memory leak of qe occurs when t4_sched_queue_unbind fails,
so fix this by free'ing qe on the error exit path.
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

After Jesper commit back in linux-3.18, we trigger a lockdep
splat in proc_create_data() while allocating memory from
pktgen_change_name().

This patch converts t->if_lock to a mutex, since it is now only
used from control path, and adds proper locking to pktgen_change_name()

1) pktgen_thread_lock to protect the outer loop (iterating threads)
2) t->if_lock to protect the inner loop (iterating devices)

Note that before Jesper patch, pktgen_change_name() was lacking proper
protection, but lockdep was not able to detect the problem.

Fixes: 8788370a ("pktgen: RCU-ify "if_list" to remove lock in next_to_run()")
Reported-by: John Sperbeck <jsperbeck@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Currently, socket lookups for l3mdev (vrf) use cases can match a socket
that is bound to a port but not a device (ie., a global socket). If the
sysctl tcp_l3mdev_accept is not set this leads to ack packets going out
based on the main table even though the packet came in from an L3 domain.
The end result is that the connection does not establish creating
confusion for users since the service is running and a socket shows in
ss output. Fix by requiring an exact dif to sk_bound_dev_if match if the
skb came through an interface enslaved to an l3mdev device and the
tcp_l3mdev_accept is not set.

skb's through an l3mdev interface are marked by setting a flag in
inet{6}_skb_parm. The IPv6 variant is already set; this patch adds the
flag for IPv4. Using an skb flag avoids a device lookup on the dif. The
flag is set in the VRF driver using the IP{6}CB macros. For IPv4, the
inet_skb_parm struct is moved in the cb per commit 971f10ec, so the
match function in the TCP stack needs to use TCP_SKB_CB. For IPv6, the
move is done after the socket lookup, so IP6CB is used.

The flags field in inet_skb_parm struct needs to be increased to add
another flag. There is currently a 1-byte hole following the flags,
so it can be expanded to u16 without increasing the size of the struct.

Fixes: 193125db ("net: Introduce VRF device driver")
Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Some crypto implementations (such as the generic CCM wrapper in crypto/)
use scatterlists to map fields of private data in their struct aead_req.
This means these data structures cannot live in the vmalloc area, which
means that they cannot live on the stack (with CONFIG_VMAP_STACK.)

This currently occurs only with the generic software implementation, but
the private data and usage is implementation specific, so move the whole
data structures off the stack into heap by allocating every time we need
to use them.

In addition, take care not to put any of our own stack allocations into
scatterlists. This involves reserving some extra room when allocating the
aead_request structures, and referring to those allocations in the scatter-
lists (while copying the data from the stack before the crypto operation)
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

vmxnet3_set_mc() checks new_table_pa returned by dma_map_single()
with dma_mapping_error(), but even there it assumes zero is invalid pa
(it assumes dma_mapping_error(...,0) returns true if new_table is NULL).

The patch adds an explicit variable to track status of new_table_pa.

Found by Linux Driver Verification project (linuxtesting.org).

v2: use "bool" and "true"/"false" for boolean variables.
Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>

PTR_ERR(NULL) is success.  We have to preserve the error code earlier.

Fixes: 7086605a ("stmmac: fix error check when init ptp")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

There is a race condition that can occur if EMAC interrupts are
enabled when phy_disconnect() is called.  phy_disconnect() sets
adjust_link to NULL.  When an interrupt occurs, the ISR might
call phy_mac_interrupt(), which wakes up the workqueue function
phy_state_machine().  This function might reference adjust_link,
thereby causing a null pointer exception.
Signed-off-by: Timur Tabi <timur@codeaurora.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

PCI devices that are 64-bit DMA capable should set the coherent
DMA mask as well as the streaming DMA mask. On some architectures,
these are managed separately, and so the coherent DMA mask will be
left at its default value of 32 if it is not set explicitly. This
results in errors such as

     r8169 Gigabit Ethernet driver 2.3LK-NAPI loaded
     hwdev DMA mask = 0x00000000ffffffff, dev_addr = 0x00000080fbfff000
     swiotlb: coherent allocation failed for device 0000:02:00.0 size=4096
     CPU: 0 PID: 1062 Comm: systemd-udevd Not tainted 4.8.0+ #35
     Hardware name: AMD Seattle/Seattle, BIOS 10:53:24 Oct 13 2016

on systems without memory that is 32-bit addressable by PCI devices.
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Acked-by: Francois Romieu <romieu@fr.zoreil.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Merge tag 'wireless-drivers-for-davem-2016-10-14' of git://git.kernel.org/pub/scm/linux/kernel/git/kvalo/wireless-drivers

Kalle Valo says:

====================
wireless-drivers fixes for 4.9

wlcore

* fix a double free regression causing hard to track crashes

rtl8xxxu

* fix driver reload issues, a memory leak and an endian bug

rtlwifi

* fix a major regression introduced in 4.9 with firmware loading on
  certain hardware

ath10k

* fix regression about broken cal_data debugfs file (since 4.7)

ath9k

* revert temperature compensation for AR9003+ devices, it was causing
  too much problems

ath6kl

* add Dell OEM SDIO I/O for the Venue 8 Pro
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Check answers from USB stack and avoid re-sending the request
multiple times if the device does not respond.

This fixes the following problem, observed with a probably flaky adapter.

[62108.732707] usb 1-3: new high-speed USB device number 5 using xhci_hcd
[62108.914421] usb 1-3: New USB device found, idVendor=0b95, idProduct=7720
[62108.914463] usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[62108.914476] usb 1-3: Product: AX88x72A
[62108.914486] usb 1-3: Manufacturer: ASIX Elec. Corp.
[62108.914495] usb 1-3: SerialNumber: 000001
[62114.109109] asix 1-3:1.0 (unnamed net_device) (uninitialized):
	Failed to write reg index 0x0000: -110
[62114.109139] asix 1-3:1.0 (unnamed net_device) (uninitialized):
	Failed to send software reset: ffffff92
[62119.109048] asix 1-3:1.0 (unnamed net_device) (uninitialized):
	Failed to write reg index 0x0000: -110
...

Since the USB timeout is 5 seconds, and the operation is retried 30 times,
this results in

[62278.180353] INFO: task mtpd:1725 blocked for more than 120 seconds.
[62278.180373]       Tainted: G        W      3.18.0-13298-g94ace9e #1
[62278.180383] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
...
[62278.180957] kworker/2:0     D 0000000000000000     0  5744      2 0x00000000
[62278.180978] Workqueue: usb_hub_wq hub_event
[62278.181029]  ffff880177f833b8 0000000000000046 ffff88017fd00000 ffff88017b126d80
[62278.181048]  ffff880177f83fd8 ffff880065a71b60 0000000000013340 ffff880065a71b60
[62278.181065]  0000000000000286 0000000103b1c199 0000000000001388 0000000000000002
[62278.181081] Call Trace:
[62278.181092]  [<ffffffff8e0971fd>] ? console_conditional_schedule+0x2c/0x2c
[62278.181105]  [<ffffffff8e094f7b>] schedule+0x69/0x6b
[62278.181117]  [<ffffffff8e0972e0>] schedule_timeout+0xe3/0x11d
[62278.181133]  [<ffffffff8daadb1b>] ? trace_timer_start+0x51/0x51
[62278.181146]  [<ffffffff8e095a05>] do_wait_for_common+0x12f/0x16c
[62278.181162]  [<ffffffff8da856a7>] ? wake_up_process+0x39/0x39
[62278.181174]  [<ffffffff8e095aee>] wait_for_common+0x52/0x6d
[62278.181187]  [<ffffffff8e095b3b>] wait_for_completion_timeout+0x13/0x15
[62278.181201]  [<ffffffff8de676ce>] usb_start_wait_urb+0x93/0xf1
[62278.181214]  [<ffffffff8de6780d>] usb_control_msg+0xe1/0x11d
[62278.181230]  [<ffffffffc037d629>] usbnet_write_cmd+0x9c/0xc6 [usbnet]
[62278.181286]  [<ffffffffc03af793>] asix_write_cmd+0x4e/0x7e [asix]
[62278.181300]  [<ffffffffc03afb41>] asix_set_sw_mii+0x25/0x4e [asix]
[62278.181314]  [<ffffffffc03b001d>] asix_mdio_read+0x51/0x109 [asix]
...
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

Sparse was complaining when we went to prototype some code
using ethtool_cmd_speed_set and SPEED_100000, which uses
the upper 16 bits of __u32 speed for the first time.

CHECK
...
.../uapi/linux/ethtool.h:123:28: warning:
  cast truncates bits from constant value (186a0 becomes 86a0)

The warning is actually bogus, as no bits are really lost, but
we can get rid of the sparse warning with this one small change.
Reported-by: Preethi Banala <preethi.banala@intel.com>
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

In cases where the number of tx rings is not a multiple of the number of
rx rings, the tx completion event will be handled on a different core
from the transmit and population of the ring. Races on the ring will
lead to a double-free of the page, and possibly other corruption.

The rings are initialized by default with a valid multiple of rings,
based on the number of cpus, therefore an invalid configuration requires
ethtool to change the ring layout. For instance 'ethtool -L eth0 rx 9 tx
8' will cause packets received on rx0, and XDP_TX'd to tx48, to be
completed on cpu3 (48 % 9 == 3).

Resolve this discrepancy by shifting the irq for the xdp tx queues to
start again from 0, modulo rx_ring_num.

Fixes: 9ecc2d86 ("net/mlx4_en: add xdp forwarding and data write support")
Reported-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Brenden Blanco <bblanco@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Yuval Mintz says:

====================
qed: Fix dependencies and warnings series

The first patch in this series follows Dan Carpenter's reports about
Smatch warnings for recent qed additions and fixes those.

The second patch is the most significant one [and the reason this is
ntended for 'net'] - it's based on Arnd Bermann's suggestion for fixing
compilation issues that were introduced with the roce addition as a result
of certain combinations of qed, qede and qedr Kconfig options.

The third follows the discussion with Arnd and clears a lot of the warnings
that arise when compiling the drivers with "C=1".

Please consider applying this series to 'net'.
====================
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

This cleans many of the warnings that would arise in qed as a
result of compilations with C=1; Most of those are the addition
of missing 'static' to functions, although there are several other
fixes as well.
Signed-off-by: Yuval Mintz <Yuval.Mintz@caviumnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

The qedr driver would require a tristate Kconfig option [to allow
it to compile as a module], and toward that end we've added the
INFINIBAND_QEDR option. But as we've made the compilation of the
qed/qede infrastructure required for RoCE dependent on the option
we'd be facing linking difficulties in case that QED=y or QEDE=y,
and INFINIBAND_QEDR=m.

To resolve this, we seperate between the INFINIBAND_QEDR option
and the infrastructure support in qed/qede by introducing a new
QED_RDMA option which would be selected by INFINIBAND_QEDR but would
be a boolean instead of a tristate; Following that, the qed/qede is
fixed based on this new option so that all config combinations would
be supported.

Fixes: cee9fbd8 ("qede: add qedr framework")
Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Yuval Mintz <Yuval.Mintz@caviumnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Smatch compains about qed_roce_ll2_tx() dereference
of the 'cdev' variable while testing its validity later.
As the validation checking is an over-kill [variable would always
be set], simply remove it.
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Fixes: abd49676 ("qed: Add RoCE ll2 & GSI support")
Signed-off-by: Yuval Mintz <Yuval.Mintz@caviumnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

The IPv6 temporary address generation uses a variable called DESYNC_FACTOR
to prevent hosts updating the addresses at the same time. Quoting RFC 4941:

   ... The value DESYNC_FACTOR is a random value (different for each
   client) that ensures that clients don't synchronize with each other and
   generate new addresses at exactly the same time ...

DESYNC_FACTOR is defined as:

   DESYNC_FACTOR -- A random value within the range 0 - MAX_DESYNC_FACTOR.
   It is computed once at system start (rather than each time it is used)
   and must never be greater than (TEMP_VALID_LIFETIME - REGEN_ADVANCE).

First, I believe the RFC has a typo in it and meant to say: "and must
never be greater than (TEMP_PREFERRED_LIFETIME - REGEN_ADVANCE)"

The reason is that at various places in the RFC, DESYNC_FACTOR is used in
a calculation like (TEMP_PREFERRED_LIFETIME - DESYNC_FACTOR) or
(TEMP_PREFERRED_LIFETIME - REGEN_ADVANCE - DESYNC_FACTOR). It needs to be
smaller than (TEMP_PREFERRED_LIFETIME - REGEN_ADVANCE) for the result of
these calculations to be larger than zero. It's never used in a
calculation together with TEMP_VALID_LIFETIME.

I already submitted an errata to the rfc-editor:
https://www.rfc-editor.org/errata_search.php?rfc=4941

The Linux implementation of DESYNC_FACTOR is very wrong:
max_desync_factor is used in places DESYNC_FACTOR should be used.
max_desync_factor is initialized to the RFC-recommended value for
MAX_DESYNC_FACTOR (600) but the whole point is to get a _random_ value.

And nothing ensures that the value used is not greater than
(TEMP_PREFERRED_LIFETIME - REGEN_ADVANCE), which leads to underflows.  The
effect can easily be observed when setting the temp_prefered_lft sysctl
e.g. to 60. The preferred lifetime of the temporary addresses will be
bogus.

TEMP_PREFERRED_LIFETIME and REGEN_ADVANCE are not constants and can be
influenced by these three sysctls: regen_max_retry, dad_transmits and
temp_prefered_lft. Thus, the upper bound for desync_factor needs to be
re-calculated each time a new address is generated and if desync_factor is
larger than the new upper bound, a new random value needs to be
re-generated.

And since we already have max_desync_factor configurable per interface, we
also need to calculate and store desync_factor per interface.
Signed-off-by: Jiri Bohac <jbohac@suse.cz>
Signed-off-by: David S. Miller <davem@davemloft.net>