Author: hselasky
Date: Fri May 1 10:32:42 2020
New Revision: 360532
URL: https://svnweb.freebsd.org/changeset/base/360532
Log:
Implement more PCI-express bandwidth functions in the LinuxKPI.
Submitted by: ashafer_badland.io (Austin Shafer)
MFC after: 1 week
Sponsored by: Mellanox Technologies
Modified:
head/sys/compat/linuxkpi/common/include/linux/pci.h
Modified: head/sys/compat/linuxkpi/common/include/linux/pci.h
==============================================================================
--- head/sys/compat/linuxkpi/common/include/linux/pci.h Fri May 1 10:28:21
2020 (r360531)
+++ head/sys/compat/linuxkpi/common/include/linux/pci.h Fri May 1 10:32:42
2020 (r360532)
@@ -954,6 +954,47 @@ pcie_get_width_cap(struct pci_dev *dev)
return (PCIE_LNK_WIDTH_UNKNOWN);
}
+static inline int
+pcie_get_mps(struct pci_dev *dev)
+{
+ return (pci_get_max_payload(dev->dev.bsddev));
+}
+
+static inline uint32_t
+PCIE_SPEED2MBS_ENC(enum pci_bus_speed spd)
+{
+
+ switch(spd) {
+ case PCIE_SPEED_16_0GT:
+ return (16000 * 128 / 130);
+ case PCIE_SPEED_8_0GT:
+ return (8000 * 128 / 130);
+ case PCIE_SPEED_5_0GT:
+ return (5000 * 8 / 10);
+ case PCIE_SPEED_2_5GT:
+ return (2500 * 8 / 10);
+ default:
+ return (0);
+ }
+}
+
+static inline uint32_t
+pcie_bandwidth_available(struct pci_dev *pdev,
+ struct pci_dev **limiting,
+ enum pci_bus_speed *speed,
+ enum pcie_link_width *width)
+{
+ enum pci_bus_speed nspeed = pcie_get_speed_cap(pdev);
+ enum pcie_link_width nwidth = pcie_get_width_cap(pdev);
+
+ if (speed)
+ *speed = nspeed;
+ if (width)
+ *width = nwidth;
+
+ return (nwidth * PCIE_SPEED2MBS_ENC(nspeed));
+}
+
/*
* The following functions can be used to attach/detach the LinuxKPI's
* PCI device runtime. The pci_driver and pci_device_id pointer is
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