treewide: Replace GPLv2 boilerplate/reference with SPDX - gpl-2.0_168.RULE (part 1)

Based on the normalized pattern:

this program is free software you may redistribute it and/or modify it
under the terms of the gnu general public license as published by the
free software foundation version 2 of the license the software is
provided as is without warranty of any kind express or implied
including but not limited to the warranties of merchantability fitness
for a particular purpose and noninfringement in no event shall the
authors or copyright holders be liable for any claim damages or other
liability whether in an action of contract tort or otherwise arising
from out of or in connection with the software or the use or other
dealings in the software

extracted by the scancode license scanner the SPDX license identifier

GPL-2.0-only

has been chosen to replace the boilerplate/reference.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

net: cisco: enic: Replace GFP_ATOMIC with GFP_KERNEL

vnic_dev_register(), vnic_rq_alloc_bufs() and vnic_wq_alloc_bufs()
are never called in atomic context.
They call kzalloc() with GFP_ATOMIC, which is not necessary.
GFP_ATOMIC can be replaced with GFP_KERNEL.

This is found by a static analysis tool named DCNS written by myself.

Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Acked-by: Govindarajulu Varadarajan <gvaradar@cisco.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

enic: reset fetch index

Since we are allowing rx ring size modification, reset fetch index
everytime. Otherwise it could have a stale value that can lead to a null
pointer dereference.

Signed-off-by: Govindarajulu Varadarajan <gvaradar@cisco.com>
Signed-off-by: Parvi Kaustubhi <pkaustub@cisco.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

enic: fix rq disable

When MTU is changed from 9000 to 1500 while there is burst of inbound 9000
bytes packets, adaptor sometimes delivers 9000 bytes packets to 1500 bytes
buffers. This causes memory corruption and sometimes crash.

This is because of a race condition in adaptor between "RQ disable"
clearing descriptor mini-cache and mini-cache valid bit being set by
completion of descriptor fetch. This can result in stale RQ desc being
cached and used when packets arrive. In this case, the stale descriptor
have old MTU value.

Solution is to write RQ->disable twice. The first write will stop any
further desc fetches, allowing the second disable to clear the mini-cache
valid bit without danger of a race.

Also, the check for rq->running becoming 0 after writing rq->enable to 0
is not done properly. When incoming packets are flooding the interface,
rq->running will pulse high for each dropped packet. Since the driver was
waiting for 10us between each poll, it is possible to see rq->running = 1
1000 times in a row, even though it is not actually stuck running.
This results in false failure of vnic_rq_disable(). Fix is to try more
than 1000 time without delay between polls to ensure we do not miss when
running goes low.

In old adaptors rq->enable needs to be re-written to 0 when posted_index
is reset in vnic_rq_clean() in order to keep rq->prefetch_index in sync.

Signed-off-by: Govindarajulu Varadarajan <_govind@gmx.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

cisco: enic: Update logging macros and uses

Don't hide varibles used by the logging macros.

Miscellanea:

o Use the more common ##__VA_ARGS__ extension
o Add missing newlines to formats
o Realign arguments

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

enic: use netdev_<foo> or dev_<foo> instead of pr_<foo>

pr_info does not give any details about the interface involved. This patch
uses netdev_info for printing the message. Use dev_info where netdev is not
ready.

Signed-off-by: Govindarajulu Varadarajan <_govind@gmx.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

enic: fix memory leak in rq_clean

When incoming packet qualifies for rx_copybreak, we copy the data to newly
allocated skb. We do not free/unmap the original buffer. At this point driver
assumes this buffer is unallocated. When enic_rq_alloc_buf() is called for
buffer allocation, it checks if buf->os_buf is NULL. If its not NULL that means
buffer can be re-used.

When vnic_rq_clean() is called for freeing all rq buffers, and if the
rx_copybreak reused buffer falls outside the used desc, we do not free the
buffer. The following trace is observer when dma-debug is enabled.

Fix is to walk through complete ring and clean if buffer is present.

[ 40.555386] ------------[ cut here ]------------
[ 40.555396] WARNING: CPU: 0 PID: 491 at lib/dma-debug.c:971 dma_debug_device_change+0x188/0x1f0()
[ 40.555400] pci 0000:06:00.0: DMA-API: device driver has pending DMA allocations while released from device [count=4]
One of leaked entries details: [device address=0x00000000ff4cc040] [size=9018 bytes] [mapped with DMA_FROM_DEVICE] [mapped as single]
[ 40.555402] Modules linked in: nfsv3 nfs_acl rpcsec_gss_krb5 auth_rpcgss oid_registry nfsv4 dns_resolver coretemp intel_rapl iosf_mbi x86_pkg_temp_thermal intel_powerclamp kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw joydev mousedev gf128mul hid_generic glue_helper mgag200 usbhid ttm hid drm_kms_helper drm ablk_helper syscopyarea sysfillrect sysimgblt i2c_algo_bit i2c_core iTCO_wdt cryptd mac_hid evdev pcspkr sb_edac edac_core tpm_tis iTCO_vendor_support ipmi_si wmi tpm ipmi_msghandler shpchp lpc_ich processor acpi_power_meter hwmon button ac sch_fq_codel nfs lockd grace sunrpc fscache sd_mod ehci_pci ehci_hcd megaraid_sas usbcore scsi_mod usb_common enic(-) crc32c_generic crc32c_intel btrfs xor raid6_pq ext4 crc16 mbcache jbd2
[ 40.555467] CPU: 0 PID: 491 Comm: rmmod Not tainted 4.1.0-rc7-ARCH-01305-gf59b71f #118
[ 40.555469] Hardware name: Cisco Systems Inc UCSB-B200-M4/UCSB-B200-M4, BIOS B200M4.2.2.2.23.061220140128 06/12/2014
[ 40.555471] 0000000000000000 00000000e2f8a5b7 ffff880275f8bc48 ffffffff8158d6f0
[ 40.555474] 0000000000000000 ffff880275f8bca0 ffff880275f8bc88 ffffffff8107b04a
[ 40.555477] ffff8802734e0000 0000000000000004 ffff8804763fb3c0 ffff88027600b650
[ 40.555480] Call Trace:
[ 40.555488] [<ffffffff8158d6f0>] dump_stack+0x4f/0x7b
[ 40.555492] [<ffffffff8107b04a>] warn_slowpath_common+0x8a/0xc0
[ 40.555494] [<ffffffff8107b0d5>] warn_slowpath_fmt+0x55/0x70
[ 40.555498] [<ffffffff812fa408>] dma_debug_device_change+0x188/0x1f0
[ 40.555503] [<ffffffff8109aaef>] notifier_call_chain+0x4f/0x80
[ 40.555506] [<ffffffff8109aecb>] __blocking_notifier_call_chain+0x4b/0x70
[ 40.555510] [<ffffffff8109af06>] blocking_notifier_call_chain+0x16/0x20
[ 40.555514] [<ffffffff813f8066>] __device_release_driver+0xf6/0x120
[ 40.555518] [<ffffffff813f8b08>] driver_detach+0xc8/0xd0
[ 40.555523] [<ffffffff813f7c59>] bus_remove_driver+0x59/0xe0
[ 40.555527] [<ffffffff813f93a0>] driver_unregister+0x30/0x70
[ 40.555534] [<ffffffff8131532d>] pci_unregister_driver+0x2d/0xa0
[ 40.555542] [<ffffffffa0200ec2>] enic_cleanup_module+0x10/0x14e [enic]
[ 40.555547] [<ffffffff8110158f>] SyS_delete_module+0x1cf/0x280
[ 40.555551] [<ffffffff811e284e>] ? ____fput+0xe/0x10
[ 40.555554] [<ffffffff810980ec>] ? task_work_run+0xbc/0xf0
[ 40.555558] [<ffffffff815930ee>] system_call_fastpath+0x12/0x71
[ 40.555561] ---[ end trace 4988cadc77c2b236 ]---
[ 40.555562] Mapped at:
[ 40.555563] [<ffffffff812fa865>] debug_dma_map_page+0x95/0x150
[ 40.555566] [<ffffffffa01f4a88>] enic_rq_alloc_buf+0x1b8/0x360 [enic]
[ 40.555570] [<ffffffffa01f7658>] enic_open+0xf8/0x820 [enic]
[ 40.555574] [<ffffffff8148d50e>] __dev_open+0xce/0x150
[ 40.555579] [<ffffffff8148d851>] __dev_change_flags+0xa1/0x170

Signed-off-by: Govindarajulu Varadarajan <_govind@gmx.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net: enic: Adding support for Cisco Low Latency NIC

This patch,
- Adds new firmware commands for the new Cisco Low Latency NIC
(aka. USNIC).

Signed-off-by: Neel Patel <neepatel@cisco.com>
Signed-off-by: Nishank Trivedi <nistrive@cisco.com>
Signed-off-by: Christian Benvenuti <benve@cisco.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net: Remove unnecessary k.alloc/v.alloc OOM messages

alloc failures use dump_stack so emitting an additional
out-of-memory message is an unnecessary duplication.

Remove the allocation failure messages.

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

enic: Move the Cisco driver

Move the Cisco driver into drivers/net/ethernet/cisco/ and make the
necessary Kconfig and Makefile changes.

CC: Christian Benvenuti <benve@cisco.com>
CC: Vasanthy Kolluri <vkolluri@cisco.com>
CC: Roopa Prabhu <roprabhu@cisco.com>
CC: David Wang <dwang2@cisco.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>