[dpdk-dev] [PATCH v10 6/9] eal: auto detect iova mode

Maxime Coquelin maxime.coquelin at redhat.com
Fri Oct 13 10:48:06 CEST 2017

Hi Santosh,

On 10/06/2017 01:03 PM, Santosh Shukla wrote:
> iova autodetection depends on rte_bus_scan result. Result of bus scan will
> have updated device_list and each device in that list has its '.kdev' state
> updated. That kdrv state used to detect iova mapping mode for that device.
> _device_parse() has dependency on rt_bus_scan so,
> Below calls moved up in the eal initialization order:
> 	- eal_option_device_parse
> 	- rte_bus_scan
> And based on the result of rte_bus_scan_iommu_class - select iova
> mapping mode.
> Signed-off-by: Santosh Shukla <santosh.shukla at caviumnetworks.com>
> Signed-off-by: Jerin Jacob <jerin.jacob at caviumnetworks.com>
> Reviewed-by: Maxime Coquelin <maxime.coquelin at redhat.com>
> Reviewed-by: Anatoly Burakov <anatoly.burakov at intel.com>
> Tested-by: Hemant Agrawal <hemant.agrawal at nxp.com>
> ---
>   lib/librte_eal/bsdapp/eal/eal.c   | 27 ++++++++++++++++-----------
>   lib/librte_eal/linuxapp/eal/eal.c | 27 ++++++++++++++++-----------
>   2 files changed, 32 insertions(+), 22 deletions(-)

We noticed a regression on current master, which prevents to use Vhost

# ./install/bin/testpmd --file-prefix=src -l 0,2 -n 4 --vdev 
'net_vhost0,iface=/tmp/vhost-user2' -d ./install/lib/librte_pmd_vhost.so 
-- --portmask=1 --disable-hw-vlan -i --rxq=1 --txq=1 --nb-cores=1 
EAL: Detected 4 lcore(s)
ERROR: failed to parse device "net_vhost0"
EAL: Unable to parse device 'net_vhost0,iface=/tmp/vhost-user2'
PANIC in main():
Cannot init EAL
5: [./install/bin/testpmd(_start+0x2a) [0x41e91a]]
4: [/lib64/libc.so.6(__libc_start_main+0xea) [0x7f551882550a]]
3: [./install/bin/testpmd(main+0x68e) [0x41e77e]]
Aborted (core dumped)

Git bisect seems to point to this patch:

$ git bisect log
git bisect start
# bad: [5518fc95427891e8bcf72f461cdaa38604226442] mempool/dpaa2: improve 
error handling
git bisect bad 5518fc95427891e8bcf72f461cdaa38604226442
# good: [02657b4adcb8af773e26ec061b01cd7abdd3f0b6] version: 17.08.0
git bisect good 02657b4adcb8af773e26ec061b01cd7abdd3f0b6
# good: [4fa5e0bbc5730887a4a15b915bb15deb5ef1f607] net/dpaa: support 
hashed RSS
git bisect good 4fa5e0bbc5730887a4a15b915bb15deb5ef1f607
# bad: [381acec2b1bd838c4a494b82c692db35573554da] eventdev: ease 
single-link queue config requirements
git bisect bad 381acec2b1bd838c4a494b82c692db35573554da
# bad: [f1810113590373b157ebba555d6b51f38c8ca10f] config: enable igb_uio 
on arm64
git bisect bad f1810113590373b157ebba555d6b51f38c8ca10f
# good: [69293c7762a0dbb3c28f5e93be00aaa49b52cb48] bus/fslmc: remove 
unused funcs and align names in QBMAN
git bisect good 69293c7762a0dbb3c28f5e93be00aaa49b52cb48
# good: [f8244c6399d9fae6afab6770ae367aef38742ea5] ethdev: increase port 
id range
git bisect good f8244c6399d9fae6afab6770ae367aef38742ea5
# bad: [680f6c12600f5d341c5968a1daeef7c5a055451b] mem: honor IOVA mode 
in virt2phy
git bisect bad 680f6c12600f5d341c5968a1daeef7c5a055451b
# good: [a4f0a2dbe5abc2cadf0300fb4d5767b66254035d] pci: get IOMMU class
git bisect good a4f0a2dbe5abc2cadf0300fb4d5767b66254035d
# good: [93878cf0255e9dc21322ed99ad535adc048fa44f] eal: introduce helper 
API for IOVA mode
git bisect good 93878cf0255e9dc21322ed99ad535adc048fa44f
# bad: [e85a919286d2543500bc384df206740845e85362] vfio: honor IOVA mode 
before mapping
git bisect bad e85a919286d2543500bc384df206740845e85362
# bad: [cf408c22476c9f866deacac634dd17591e07a5c5] eal: auto detect IOVA mode
git bisect bad cf408c22476c9f866deacac634dd17591e07a5c5
# first bad commit: [cf408c22476c9f866deacac634dd17591e07a5c5] eal: auto 
detect IOVA mode

This is the build commands I used to run the bisection:
make -j4 install T=x86_64-native-linuxapp-gcc DESTDIR=install 


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