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Raghu Vatsavayi ccdd0b4c35 liquidio: prevent rx queues from getting stalled 
This commit has fix for RX traffic issues when we stress test the driver
with continuous ifconfig up/down under very high traffic conditions.

Reason for the issue is that, in existing liquidio_stop function NAPI is
disabled even before actual FW/HW interface is brought down via
send_rx_ctrl_cmd(lio, 0). Between time frame of NAPI disable and actual
interface down in firmware, firmware continuously enqueues rx traffic to
host. When interrupt happens for new packets, host irq handler fails in
scheduling NAPI as the NAPI is already disabled.

After "ifconfig <iface> up", Host re-enables NAPI but cannot schedule it
until it receives another Rx interrupt. Host never receives Rx interrupt as
it never cleared the Rx interrupt it received during interface down
operation. NIC Rx interrupt gets cleared only when Host processes queue and
clears the queue counts. Above anomaly leads to other issues like packet
overflow in FW/HW queues, backpressure.

Fix:
This commit fixes this issue by disabling NAPI only after informing
firmware to stop queueing packets to host via send_rx_ctrl_cmd(lio, 0).
send_rx_ctrl_cmd is not visible in the patch as it is already there in the
code. The DOWN command also waits for any pending packets to be processed
by NAPI so that the deadlock will not occur.

Signed-off-by: Raghu Vatsavayi <raghu.vatsavayi@cavium.com>
Acked-by: Derek Chickles <derek.chickles@cavium.com>
Signed-off-by: Felix Manlunas <felix.manlunas@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
 		2018-03-30 14:16:19 -04:00
..
accessibility
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acpi Merge branch 'libnvdimm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm 2018-03-22 18:37:49 -07:00
amba
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android ANDROID: binder: synchronize_rcu() when using POLLFREE. 2018-02-16 11:16:38 +01:00
ata libata: Modify quirks for MX100 to limit NCQ_TRIM quirk to MU01 version 2018-03-19 08:36:38 -07:00
atm atm: idt77252: remove redundant bit-wise or'ing of zero 2018-02-23 12:42:26 -05:00
auxdisplay auxdisplay: img-ascii-lcd: Silence 2 uninitialized warnings 2018-03-13 18:16:38 +01:00
base ACPI updates for v4.16-rc2 2018-02-15 14:50:32 -08:00
bcma bcma: Prevent build of PCI host features in module 2018-03-13 18:47:47 +02:00
block loop: Fix lost writes caused by missing flag 2018-03-09 08:36:36 -07:00
bluetooth Bluetooth: btrsi: rework dependencies 2018-03-27 10:11:58 +03:00
bus bus: ti-sysc: Fix checking of no-reset-on-init quirk 2018-02-15 09:18:55 -08:00
cdrom
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char tpm: fix potential buffer overruns caused by bit glitches on the bus 2018-02-26 15:43:46 -08:00
clk clk: bcm2835: Protect sections updating shared registers 2018-03-19 09:27:37 -07:00
clocksource clocksource/atmel-st: Add 'depends on HAS_IOMEM' to fix unmet dependency 2018-03-09 11:11:58 +01:00
connector
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cpufreq Merge branch 'cpufreq-scpi' 2018-03-02 10:44:44 +01:00
cpuidle powerpc updates for 4.16 2018-02-02 10:01:04 -08:00
crypto s390: 2018-02-26 09:28:35 -08:00
dax dax: ->direct_access does not sleep anymore 2018-02-26 12:32:29 -08:00
dca
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devfreq PM / devfreq: Fix potential NULL pointer dereference in governor_store 2018-01-02 09:36:54 +09:00
dio
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dma dmaengine: mv_xor_v2: Fix clock resource by adding a register clock 2018-03-11 20:33:27 +05:30
dma-buf vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
edac EDAC, sb_edac: Fix out of bound writes during DIMM configuration on KNL 2018-02-23 12:05:37 +01:00
eisa EISA: Delete error message for a failed memory allocation in eisa_probe() 2018-01-23 09:04:10 +01:00
extcon extcon: int3496: process id-pin first so that we start with the right status 2018-02-14 06:37:33 +09:00
firewire vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
firmware Merge branch 'efi-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2018-03-18 11:56:53 -07:00
fmc
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fpga fpga: socfpga-a10: disable clk on error in socfpga_a10_fpga_probe() 2017-12-18 15:59:16 +01:00
fsi
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gpio gpio: rcar: Use wakeup_path i.s.o. explicit clock handling 2018-03-05 09:01:21 +01:00
gpu drm/ast: Fixed 1280x800 Display Issue 2018-03-23 09:50:54 +10:00
hid usb: ldusb: add PIDs for new CASSY devices supported by this driver 2018-02-15 18:44:03 +01:00
hsi vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
hv vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
hwmon Fix bad temperature display on Ryzen/Threadripper 2018-02-15 14:31:28 -08:00
hwspinlock
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hwtracing Char/Misc driver patches for 4.16-rc1 2018-02-01 10:31:17 -08:00
i2c i2c: octeon: Prevent error message on bus error 2018-03-02 11:11:15 +01:00
ide genhd: Rename get_disk() to get_disk_and_module() 2018-02-26 09:48:42 -07:00
idle
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iio First round of IIO fixes for the 4.16 cycle. 2018-02-20 10:03:22 +01:00
infiniband qed*: Utilize FW 8.33.11.0 2018-03-29 14:18:02 -04:00
input Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input 2018-03-07 17:37:32 -08:00
iommu treewide/trivial: Remove ';;$' typo noise 2018-02-22 10:59:33 +01:00
ipack
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irqchip irqchip/irq-imx-gpcv2: Remove unused function 2018-03-11 13:27:12 +00:00
isdn net: make getname() functions return length rather than use int* parameter 2018-02-12 14:15:04 -05:00
leds vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
lightnvm lightnvm: pblk: refactor pblk_ppa_comp function 2018-01-05 08:50:12 -07:00
macintosh powerpc/macio: set a proper dma_coherent_mask 2018-02-13 08:58:53 -08:00
mailbox vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
mcb
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md dm mpath: fix passing integrity data 2018-03-14 15:39:33 -04:00
media media: vb2: Makefile: place vb2-trace together with vb2-core 2018-02-26 11:39:04 -05:00
memory memory: brcmstb: dpfe: support new way of passing data from the DCPU 2018-02-23 10:56:59 -08:00
memstick
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message scsi: mptfusion: Add bounds check in mptctl_hp_targetinfo() 2018-01-30 21:32:06 -05:00
mfd vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
misc powerpc fixes for 4.16 #5 2018-03-09 09:33:48 -08:00
mmc mmc: sdhci-acpi: Fix IRQ 0 2018-03-21 11:10:20 +01:00
mtd mtd: nand: MTD_NAND_MARVELL should depend on HAS_DMA 2018-02-12 10:57:20 +01:00
mux Char/Misc driver patches for 4.16-rc1 2018-02-01 10:31:17 -08:00
net liquidio: prevent rx queues from getting stalled 2018-03-30 14:16:19 -04:00
nfc
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ntb NTB: ntb_perf: fix cast to restricted __le32 2018-01-28 22:17:24 -05:00
nubus nubus: Add support for the driver model 2018-01-16 16:47:29 +01:00
nvdimm libnvdimm, nfit: fix persistence domain reporting 2018-03-21 15:12:07 -07:00
nvme nvme_fc: rework sqsize handling 2018-03-08 10:39:58 -07:00
nvmem Merge 4.15-rc6 into char-misc-next 2018-01-02 14:46:35 +01:00
of of_net: Implement of_get_nvmem_mac_address helper 2018-03-30 10:40:18 -04:00
opp opp: cpu: Replace GFP_ATOMIC with GFP_KERNEL in dev_pm_opp_init_cpufreq_table 2018-02-12 15:07:46 +05:30
oprofile
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parisc parisc: Show unhashed EISA EEPROM address 2018-01-02 21:01:02 +01:00
parport
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pci Merge branch 'for-4.16-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/libata 2018-03-19 14:23:30 -07:00
pcmcia Merge branch 'pcmcia' of git://git.kernel.org/pub/scm/linux/kernel/git/brodo/pcmcia 2018-02-08 11:48:49 -08:00
perf arm_pmu: Use disable_irq_nosync when disabling SPI in CPU teardown hook 2018-02-28 14:59:47 +00:00
phy phy: qcom-ufs: add MODULE_LICENSE tag 2018-03-12 15:11:59 +05:30
pinctrl pinctrl: meson-axg: adjust uart_ao_b pin group naming 2018-02-12 10:47:36 +01:00
platform platform-drivers-x86 for v4.16-7 2018-03-14 13:01:14 -07:00
pnp PNP: pnpbios: Use PTR_ERR_OR_ZERO() 2017-12-18 16:47:27 +01:00
power power supply and reset changes for the v4.16 series 2018-01-31 12:55:31 -08:00
powercap powercap: intel_rapl: Fix trailing semicolon 2018-01-17 12:56:24 +01:00
pps vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
ps3
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ptp vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
pwm
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rapidio vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
ras mm/memory_failure: Remove unused trapno from memory_failure 2018-01-23 12:17:42 -06:00
regulator Merge remote-tracking branches 'regulator/fix/resume' and 'regulator/fix/stm32-vfrefbuf' into regulator-linus 2018-03-07 14:39:07 +00:00
remoteproc remoteproc updates for v4.16 2018-02-05 10:07:40 -08:00
reset
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rpmsg vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
rtc vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
s390 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-03-23 11:31:58 -04:00
sbus pci-v4.16-changes 2018-02-06 09:59:40 -08:00
scsi Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-03-23 11:31:58 -04:00
sfi
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sh cpufreq: Add and use cpufreq_for_each_{valid_,}entry_idx() 2018-02-08 10:21:39 +01:00
siox siox: add gpio bus driver 2017-12-19 10:56:53 +01:00
slimbus slimbus: qcom: add HAS_IOMEM dependency 2018-01-09 17:01:15 +01:00
sn
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soc Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-03-23 11:31:58 -04:00
soundwire soundwire: Fix a signedness bug 2018-01-22 16:45:26 +01:00
spi Merge remote-tracking branch 'spi/topic/xilinx' into spi-next 2018-01-26 17:57:34 +00:00
spmi
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ssb ssb: use put_device() if device_register fail 2018-03-13 18:48:29 +02:00
staging Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-03-23 11:31:58 -04:00
target net: make getname() functions return length rather than use int* parameter 2018-02-12 14:15:04 -05:00
tc
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tee This pull request updates the previous tee-drv-dynamic-shm-for-v4.16 pull 2018-01-11 18:05:06 -08:00
thermal Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux 2018-02-06 15:04:58 -08:00
thunderbolt thunderbolt: Mask ring interrupt properly when polling starts 2017-12-16 16:37:51 +01:00
tty serial: imx: fix bogus dev_err 2018-02-28 13:48:21 +01:00
uio vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
usb Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-03-23 11:31:58 -04:00
uwb uwb: Replace mac address parsing 2018-01-09 16:15:20 +01:00
vfio vfio: disable filesystem-dax page pinning 2018-03-02 18:00:04 -08:00
vhost Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-03-23 11:31:58 -04:00
video fbdev: Fixing arbitrary kernel leak in case FBIOGETCMAP_SPARC in sbusfb_ioctl_helper(). 2018-03-07 14:00:34 +01:00
virt vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
virtio virtio_ring: fix num_free handling in error case 2018-03-01 18:53:38 +02:00
visorbus
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vlynq
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vme vme: Fix a possible sleep-in-atomic bug in vme_tsi148 2017-12-18 15:59:18 +01:00
w1 Documentation updates for 4.16. New stuff includes refcount_t 2018-01-31 19:25:25 -08:00
watchdog ACPI / watchdog: Fix off-by-one error at resource assignment 2018-03-19 23:17:07 +01:00
xen xen: fix for V4.16-rc5 2018-03-09 16:54:18 -08:00
zorro
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Kconfig Char/Misc driver patches for 4.16-rc1 2018-02-01 10:31:17 -08:00
Makefile pci-v4.16-changes 2018-02-06 09:59:40 -08:00