On 2020/11/13 下午9:47, Stefano Garzarella wrote:
Thanks to Max that started this work!
I took his patches, and extended the block simulator a bit.
This series moves the network device simulator in a new module
(vdpa_sim_net) and leaves the generic functions in the vdpa_sim core
module, allowing the possibility to add new vDPA device simulators.
Then we added a new vdpa_sim_blk module to simulate a block device.
I'm not sure about patch 11 ("vringh: allow vringh_iov_xfer() to skip
bytes when ptr is NULL"), maybe we can add a new functions instead of
modify vringh_iov_xfer().
As Max reported, I'm also seeing errors with vdpa_sim_blk related to
iotlb and vringh when there is high load, these are some of the error
messages I can see randomly:
vringh: Failed to access avail idx at 00000000e8deb2cc
vringh: Failed to read head: idx 6289 address 00000000e1ad1d50
vringh: Failed to get flags at 000000006635d7a3
virtio_vdpa vdpa0: vringh_iov_push_iotlb() error: -14 offset: 0x2840000 len: 0x20000
virtio_vdpa vdpa0: vringh_iov_pull_iotlb() error: -14 offset: 0x58ee000 len: 0x3000
These errors should all be related to the fact that iotlb_translate()
fails with -EINVAL, so it seems that we miss some mapping.
Is this only reproducible when there's multiple co-current accessing of
IOTLB? If yes, it's probably a hint that some kind of synchronization is
still missed somewhere.
It might be useful to log the dma_map/unmp in both virtio_ring and
vringh to see who is missing the map.
Thanks
I'll debug more carefully, in the meantime can you give a first review?
Thanks,
Stefano
Max Gurtovoy (4):
vhost-vdpa: add support for vDPA blk devices
vdpa: split vdpasim to core and net modules
vdpa_sim: remove hard-coded virtq count
vdpa: add vdpa simulator for block device
Stefano Garzarella (8):
vdpa_sim: remove the limit of IOTLB entries
vdpa_sim: add struct vdpasim_device to store device properties
vdpa_sim: move config management outside of the core
vdpa_sim: use kvmalloc to allocate vdpasim->buffer
vdpa_sim: make vdpasim->buffer size configurable
vdpa_sim: split vdpasim_virtqueue's iov field in riov and wiov
vringh: allow vringh_iov_xfer() to skip bytes when ptr is NULL
vdpa_sim_blk: implement ramdisk behaviour
drivers/vdpa/vdpa_sim/vdpa_sim.h | 117 +++++++++++
drivers/vdpa/vdpa_sim/vdpa_sim.c | 283 +++++----------------------
drivers/vdpa/vdpa_sim/vdpa_sim_blk.c | 251 ++++++++++++++++++++++++
drivers/vdpa/vdpa_sim/vdpa_sim_net.c | 172 ++++++++++++++++
drivers/vhost/vdpa.c | 11 +-
drivers/vhost/vringh.c | 16 +-
drivers/vdpa/Kconfig | 16 +-
drivers/vdpa/vdpa_sim/Makefile | 2 +
8 files changed, 628 insertions(+), 240 deletions(-)
create mode 100644 drivers/vdpa/vdpa_sim/vdpa_sim.h
create mode 100644 drivers/vdpa/vdpa_sim/vdpa_sim_blk.c
create mode 100644 drivers/vdpa/vdpa_sim/vdpa_sim_net.c
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