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Revision 1d5a474240407c38ca8c7484a656ee39f585399c authored by Martin Habets on 02 January 2022, 08:41:22 UTC, committed by Jakub Kicinski on 05 January 2022, 02:14:21 UTC 
sfc: The RX page_ring is optional
 
The RX page_ring is an optional feature that improves
performance. When allocation fails the driver can still
function, but possibly with a lower bandwidth.
Guard against dereferencing a NULL page_ring.

Fixes: 2768935a4660 ("sfc: reuse pages to avoid DMA mapping/unmapping costs")
Signed-off-by: Martin Habets <habetsm.xilinx@gmail.com>
Reported-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
Link: https://lore.kernel.org/r/164111288276.5798.10330502993729113868.stgit@palantir17.mph.net
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
1 parent 6f89ecf
Raw File
pci-endpoint-test.rst 
.. SPDX-License-Identifier: GPL-2.0

=====================================
Driver for PCI Endpoint Test Function
=====================================

This driver should be used as a host side driver if the root complex is
connected to a configurable PCI endpoint running ``pci_epf_test`` function
driver configured according to [1]_.

The "pci_endpoint_test" driver can be used to perform the following tests.

The PCI driver for the test device performs the following tests:

	#) verifying addresses programmed in BAR
	#) raise legacy IRQ
	#) raise MSI IRQ
	#) raise MSI-X IRQ
	#) read data
	#) write data
	#) copy data

This misc driver creates /dev/pci-endpoint-test.<num> for every
``pci_epf_test`` function connected to the root complex and "ioctls"
should be used to perform the above tests.

ioctl
-----

 PCITEST_BAR:
	      Tests the BAR. The number of the BAR to be tested
	      should be passed as argument.
 PCITEST_LEGACY_IRQ:
	      Tests legacy IRQ
 PCITEST_MSI:
	      Tests message signalled interrupts. The MSI number
	      to be tested should be passed as argument.
 PCITEST_MSIX:
	      Tests message signalled interrupts. The MSI-X number
	      to be tested should be passed as argument.
 PCITEST_SET_IRQTYPE:
	      Changes driver IRQ type configuration. The IRQ type
	      should be passed as argument (0: Legacy, 1:MSI, 2:MSI-X).
 PCITEST_GET_IRQTYPE:
	      Gets driver IRQ type configuration.
 PCITEST_WRITE:
	      Perform write tests. The size of the buffer should be passed
	      as argument.
 PCITEST_READ:
	      Perform read tests. The size of the buffer should be passed
	      as argument.
 PCITEST_COPY:
	      Perform read tests. The size of the buffer should be passed
	      as argument.

.. [1] Documentation/PCI/endpoint/function/binding/pci-test.rst
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