[dpdk-dev] [PATCH] eal: postpone vdev initialization

[Thomas Monjalon]

2016-11-20 13:30, Jerin Jacob:
> Some platform like octeontx may use pci and
> vdev based combined device to represent a logical
> dpdk functional device.In such case, postponing the
> vdev initialization after pci device
> initialization will provide the better view of
> the pci device resources in the system in
> vdev's probe function, and it allows better
> functional subsystem registration in vdev probe
> function.
> 
> As a bonus, This patch fixes a bond device
> initialization use case.
> 
> example command to reproduce the issue:
> ./testpmd -c 0x2  --vdev 'eth_bond0,mode=0,
> slave=0000:02:00.0,slave=0000:03:00.0' --
> --port-topology=chained
> 
> root cause:
> In existing case(vdev initialization and then pci
> initialization), creates three Ethernet ports with
> following port ids
> 0 - Bond device
> 1 - PCI device 0
> 2 - PCI devive 1
> 
> Since testpmd, calls the configure/start on all the ports on
> start up,it will translate to following illegal setup sequence
> 
> 1)bond device configure/start
> 1.1) pci device0 stop/configure/start
> 1.2) pci device1 stop/configure/start
> 2)pci device 0 configure(illegal setup case,
> as device in start state)
> 
> The fix changes the initialization sequence and
> allow initialization in following valid setup order
> 1) pcie device 0 configure/start
> 2) pcie device 1 configure/start
> 3) bond device 2 configure/start
> 3.1) pcie device 0/stop/configure/start
> 3.2) pcie device 1/stop/configure/start
> 
> Signed-off-by: Jerin Jacob <jerin.jacob at caviumnetworks.com>

Applied, thanks