Interface Pools and Passthrough mode:
Current Method:
The passthrough mode uses a macvtap “direct” connection to connect each guest to the network. The physical interface to be used is picked from among those listed in <interface> sub elements of the <forward> element.
The current specification for <forward> extends to allow 0 or more <interface> sub-elements:
Example:
<forward mode='passthrough' dev='eth10'/>
<interface dev='eth10'/>
<interface dev='eth12'/>
<interface dev='eth18'/>
<interface dev='eth20'/>
</forward>
However with an ethernet card with 64 VF's or more, the above method gets tedious on the system.
On the other hand, just parameterizing a string (eth%d) is inadequate, eg, when there are multiple non-contiguous ranges.
Proposed Method:
The 5 patches provided along with this introductory e-mail
i) Introduce a structure to store the state of all the virtual functions attached to each physical function
ii) Find a free virtual function given the physical function.
The forward specification will hence only mention the physical function as the interface sub element:
Example:
<forward mode='passthrough' dev='eth2'/>
<interface dev='eth2'/>
</forward>
---
src/util/pci.c | 35 -----------------------------------
src/util/pci.h | 34 ++++++++++++++++++++++++++++++++++
2 files changed, 34 insertions(+), 35 deletions(-)
diff --git a/src/util/pci.c b/src/util/pci.c
index cd82b43..857078d 100644
--- a/src/util/pci.c
+++ b/src/util/pci.c
@@ -45,45 +45,10 @@
# define MODPROBE "modprobe"
#endif
-#define PCI_SYSFS "/sys/bus/pci/"
-#define PCI_ID_LEN 10 /* "XXXX XXXX" */
-#define PCI_ADDR_LEN 13 /* "XXXX:XX:XX.X" */
-
#define SRIOV_FOUND 0
#define SRIOV_NOT_FOUND 1
#define SRIOV_ERROR -1
-struct _pciDevice {
- unsigned domain;
- unsigned bus;
- unsigned slot;
- unsigned function;
-
- char name[PCI_ADDR_LEN]; /* domain:bus:slot.function */
- char id[PCI_ID_LEN]; /* product vendor */
- char *path;
- const char *used_by; /* The domain which uses the device */
- int fd;
-
- unsigned initted;
- unsigned pcie_cap_pos;
- unsigned pci_pm_cap_pos;
- unsigned has_flr : 1;
- unsigned has_pm_reset : 1;
- unsigned managed : 1;
-
- /* used by reattach function */
- unsigned unbind_from_stub : 1;
- unsigned remove_slot : 1;
- unsigned reprobe : 1;
-};
-
-struct _pciDeviceList {
- unsigned count;
- pciDevice **devs;
-};
-
-
/* For virReportOOMError() and virReportSystemError() */
#define VIR_FROM_THIS VIR_FROM_NONE
diff --git a/src/util/pci.h b/src/util/pci.h
index 76e37e3..8e47fc2 100644
--- a/src/util/pci.h
+++ b/src/util/pci.h
@@ -24,9 +24,43 @@
# include "internal.h"
+#define PCI_SYSFS "/sys/bus/pci/"
+#define PCI_ID_LEN 10 /* "XXXX XXXX" */
+#define PCI_ADDR_LEN 13 /* "XXXX:XX:XX.X" */
+
typedef struct _pciDevice pciDevice;
typedef struct _pciDeviceList pciDeviceList;
+struct _pciDevice {
+ unsigned domain;
+ unsigned bus;
+ unsigned slot;
+ unsigned function;
+
+ char name[PCI_ADDR_LEN]; /* domain:bus:slot.function */
+ char id[PCI_ID_LEN]; /* product vendor */
+ char *path;
+ const char *used_by; /* The domain which uses the device */
+ int fd;
+
+ unsigned initted;
+ unsigned pcie_cap_pos;
+ unsigned pci_pm_cap_pos;
+ unsigned has_flr : 1;
+ unsigned has_pm_reset : 1;
+ unsigned managed : 1;
+
+ /* used by reattach function */
+ unsigned unbind_from_stub : 1;
+ unsigned remove_slot : 1;
+ unsigned reprobe : 1;
+};
+
+struct _pciDeviceList {
+ unsigned count;
+ pciDevice **devs;
+};
+
struct pci_config_address {
unsigned int domain;
unsigned int bus;
--
1.7.4.4
--
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