[v8,0/3] virtio: vdpa: new SolidNET DPU driver

Message

Alvaro Karsz Jan. 9, 2023, 8:04 a.m. UTC

This series adds a vDPA driver for SolidNET DPU.

Patch 1 adds SolidRun vendor ID to pci_ids.
Patch 2 adds a PCI quirk needed by the DPU.
Patch 3 has the driver source code.

Patch 1 is prerequisite for both patch 2 and patch 3.

v2:
	- Semantics fixes in commit log - Patch 1.
	- Move the vendor ID to the right place, sorted by vendor ID - Patch 1.
        - Update patch subject to be more meaningful and similar to
          previous quirks - Patch 2.
        - Update the commit log to describe better what the patch does -
	  Patch 2.
	- Auto detect the BAR used for communication - Patch 3.
	- When waiting for the DPU to write a config, wait for 5secs
	  before giving up on the device - Patch 3.
	- Return EOPNOTSUPP error code in vDPA set_vq_state callback if
	  the vq state is not the same as the initial one - Patch 3.
	- Implement a vDPA reset callback - Patch 3.
	- Wait for an ACK when sending a message to the DPU - Patch 3.
	- Add endianness comments on 64bit read/write functions - Patch 3.
	- Remove the get_iova_range and free vDPA callbacks - Patch 3.
	- Usage of managed device functions to ioremap a region - Patch 3.
	- Call pci_set_drvdata and pci_set_master before
	  vdpa_register_device - Patch 3.
	- Create DMA isolation between the vDPA devices by using the
	  chip SR-IOV feature.
	  Every vDPA device gets a PCIe VF with its own DMA device - Patch 3.

v3:
	- Validate vDPA config length while receiving the DPU's config,
	  not while trying to write the vDPA config to the DPU - Patch 3.
	- Request IRQs when vDPA status is set to
          VIRTIO_CONFIG_S_DRIVER_OK - Patch 3.
	- Remove snet_reset_dev() from the PCI remove function for a VF - Patch 3.

v4:
	- Get SolidRun vendor ID from pci_ids - Patch 3.

v5:
	- Remove "select HWMON" from Kconfig.
	  Usage of "depends on HWMON || HWMON=n" instead and usage of
	  IS_ENABLED(CONFIG_HWMON) when calling to snet hwmon functions.
	  snet_hwmon.c is compiled only if CONFIG_HWMON is defined - Patch 3.
	- Remove the  #include <linux/hwmon-sysfs.h> from snet_hwmon.c - Patch 3.
	- Remove the unnecessary (long) casting from snet_hwmon_read_reg -
	  Patch 3.
	- Remove the "_hwmon" ending from the hwmon name - Patch 3.
	- Usage of IS_ERR macro to check if devm_hwmon_device_register_with_info
	  failed - Patch 3.
	- Replace schedule() with usleep_range() in the "hot loop" in
	  psnet_detect_bar - Patch 3.
	- Remove the logging of memory allocation failures - Patch 3.
	- Add parenthesis to arguments in SNET_* macros - Patch 3.
	- Prefer sizeof(*variable) instead of sizeof(struct x) when allocating
	  memory - Patch 3.

v6:
	- SNET_WRN -> SNET_WARN - Patch 3.

v7:
	- Explain the dependency of SNET_VDPA on HWMON in Kconfig - Patch 3.
	- Fix snprintf size argument in psnet_open_pf_bar and
	  snet_open_vf_bar - Patch 3.
	- Fix kernel warning in snet_vdpa_remove_vf.
	  Call pci_free_irq_vectors after vdpa_unregister_device,
	  otherwise we'll get "remove_proc_entry: removing non-empty
	  directory 'irq/..', leaking at least '..'" warnings - Patch 3.
	- Remove the psnet_create_hwmon function empty definition if
	  HWMON is not enabled, otherwise, we'll get "warning: no
	  previous prototype for 'psnet_create_hwmon'" when compiling
	  with W=1.
	  This was reported by kernel test robot <[e-mail]> - Patch 3.

v8:
        - Fix the series versioning.
          I updated the versions of every patch separately,
	  which seems to be wrong.

Alvaro Karsz (3):
  PCI: Add SolidRun vendor ID
  PCI: Avoid FLR for SolidRun SNET DPU rev 1
  virtio: vdpa: new SolidNET DPU driver.

 MAINTAINERS                        |    4 +
 drivers/pci/quirks.c               |    8 +
 drivers/vdpa/Kconfig               |   18 +
 drivers/vdpa/Makefile              |    1 +
 drivers/vdpa/solidrun/Makefile     |    6 +
 drivers/vdpa/solidrun/snet_hwmon.c |  188 +++++
 drivers/vdpa/solidrun/snet_main.c  | 1110 ++++++++++++++++++++++++++++
 drivers/vdpa/solidrun/snet_vdpa.h  |  194 +++++
 include/linux/pci_ids.h            |    2 +
 9 files changed, 1531 insertions(+)
 create mode 100644 drivers/vdpa/solidrun/Makefile
 create mode 100644 drivers/vdpa/solidrun/snet_hwmon.c
 create mode 100644 drivers/vdpa/solidrun/snet_main.c
 create mode 100644 drivers/vdpa/solidrun/snet_vdpa.h

--
2.32.0