[libvirt] [PATCH 0/3 RFC] macvtap: Implement getPhysfn to support sending a port profile message for a VF to its PF
6:56 p.m.
This patch tries to fix getPhysFn in macvtap.c to get the physical
function(PF) of the direct attach interface, if the interface is a SR-IOV VF.
It derives the PF/VF relationship from sysfs.
There is some code to do this in node device driver. But it is local
to the node device driver . I did not see a clean way to use some of the
node device stuff here. The node device driver looks at PCI capabilities to
get the same information.
This implementation tries to not get into PCI capability details and
just looks at sysfs paths to derive the PF-VF relationship
This patch series implements the following
01/3 - Add function to get the network interface name of a pci device
02/3 - Add functions to get sriov PF/VF relationship of a network interface
03/3 - macvtap: Fix getPhysfn to get the PF of a direct attach network interface
Signed-off-by: Roopa Prabhu <roprabhu(a)cisco.com>
Signed-off-by: Christian Benvenuti <benve(a)cisco.com>
Signed-off-by: David Wang <dwang2(a)cisco.com>
6:57 p.m.
New subject: [libvirt] [PATCH 1/3 RFC] Add function to get the network interface name of a pci device
From: Roopa Prabhu <roprabhu(a)cisco.com>
This function looks at sysfs "net" directory to get the network interface
name associated with the pci device
Signed-off-by: Roopa Prabhu <roprabhu(a)cisco.com>
Signed-off-by: Christian Benvenuti <benve(a)cisco.com>
Signed-off-by: David Wang <dwang2(a)cisco.com>
---
src/util/pci.c | 42 ++++++++++++++++++++++++++++++++++++++++++
src/util/pci.h | 2 ++
2 files changed, 44 insertions(+), 0 deletions(-)
diff --git a/src/util/pci.c b/src/util/pci.c
index a79c164..d2deeef 100644
--- a/src/util/pci.c
+++ b/src/util/pci.c
@@ -1679,3 +1679,45 @@ int pciDeviceIsAssignable(pciDevice *dev,
return 1;
}
+
+/*
+ * This function returns the network device name
+ * of a pci device
+ */
+int
+pciDeviceGetNetName(char *device_link_sysfs_path, char **netname)
+{
+ char *pcidev_sysfs_net_path = NULL;
+ int ret = -1;
+ DIR *dir = NULL;
+ struct dirent *entry = NULL;
+
+ if (virBuildPath(&pcidev_sysfs_net_path, device_link_sysfs_path,
+ "net") == -1) {
+ virReportOOMError();
+ return -1;
+ }
+
+ dir = opendir(pcidev_sysfs_net_path);
+ if (dir == NULL)
+ goto out;
+
+ while ((entry = readdir(dir))) {
+ if (entry->d_name[0] == '.' ||
+ !strcmp(entry->d_name, ".."))
+ continue;
+
+ /* Assume a single directory entry */
+ *netname = strdup(entry->d_name);
+ ret = 0;
+ break;
+ }
+
+ if (dir)
+ closedir(dir);
+
+out:
+ VIR_FREE(pcidev_sysfs_net_path);
+
+ return ret;
+}
diff --git a/src/util/pci.h b/src/util/pci.h
index a351baf..fa25472 100644
--- a/src/util/pci.h
+++ b/src/util/pci.h
@@ -74,4 +74,6 @@ int pciDeviceIsAssignable(pciDevice *dev,
int strict_acs_check);
int pciWaitForDeviceCleanup(pciDevice *dev, const char *matcher);
+int pciDeviceGetNetName(char *device_link_sysfs_path, char **netname);
+
#endif /* __VIR_PCI_H__ */
8 p.m.
New subject: [libvirt] [PATCH 1/3 RFC] Add function to get the network interface name of a pci device
On 08/01/2011 07:57 PM, Roopa Prabhu wrote:
From: Roopa Prabhu<roprabhu(a)cisco.com>
This function looks at sysfs "net" directory to get the network interface
name associated with the pci device
Signed-off-by: Roopa Prabhu<roprabhu(a)cisco.com>
Signed-off-by: Christian Benvenuti<benve(a)cisco.com>
Signed-off-by: David Wang<dwang2(a)cisco.com>
---
src/util/pci.c | 42 ++++++++++++++++++++++++++++++++++++++++++
src/util/pci.h | 2 ++
2 files changed, 44 insertions(+), 0 deletions(-)
diff --git a/src/util/pci.c b/src/util/pci.c
index a79c164..d2deeef 100644
--- a/src/util/pci.c
+++ b/src/util/pci.c
@@ -1679,3 +1679,45 @@ int pciDeviceIsAssignable(pciDevice *dev,
return 1;
}
+
+/*
+ * This function returns the network device name
+ * of a pci device
+ */
+int
+pciDeviceGetNetName(char *device_link_sysfs_path, char **netname)
+{
+ char *pcidev_sysfs_net_path = NULL;
+ int ret = -1;
+ DIR *dir = NULL;
+ struct dirent *entry = NULL;
+
+ if (virBuildPath(&pcidev_sysfs_net_path, device_link_sysfs_path,
+ "net") == -1) {
+ virReportOOMError();
+ return -1;
+ }
+
+ dir = opendir(pcidev_sysfs_net_path);
+ if (dir == NULL)
+ goto out;
+
+ while ((entry = readdir(dir))) {
+ if (entry->d_name[0] == '.' ||
The above check makes the
following one obsolete. If all entries with
first letter '.' can be skipped, then you could just keep the first one,
otherwise I'd also use !strcmp(entry->d_name, ".").
+ !strcmp(entry->d_name, ".."))
+ continue;
+
+ /* Assume a single directory entry */
+ *netname = strdup(entry->d_name);
+ ret = 0;
+ break;
+ }
+
+ if (dir)
+ closedir(dir);
Check for 'dir != NULL) is not necessary due to
goto above.
+
+out:
+ VIR_FREE(pcidev_sysfs_net_path);
+
+ return ret;
+}
diff --git a/src/util/pci.h b/src/util/pci.h
index a351baf..fa25472 100644
--- a/src/util/pci.h
+++ b/src/util/pci.h
@@ -74,4 +74,6 @@ int pciDeviceIsAssignable(pciDevice *dev,
int strict_acs_check);
int pciWaitForDeviceCleanup(pciDevice *dev, const char *matcher);
+int pciDeviceGetNetName(char *device_link_sysfs_path, char **netname);
+
#endif /* __VIR_PCI_H__ */
Stefan
7:33 a.m.
New subject: [libvirt] [PATCH 1/3 RFC] Add function to get the network interface name of a pci device
On 8/1/11 6:00 PM, "Stefan Berger" <stefanb(a)linux.vnet.ibm.com> wrote:
On 08/01/2011 07:57 PM, Roopa Prabhu wrote:
> From: Roopa Prabhu<roprabhu(a)cisco.com>
>
> This function looks at sysfs "net" directory to get the network interface
> name associated with the pci device
>
> Signed-off-by: Roopa Prabhu<roprabhu(a)cisco.com>
> Signed-off-by: Christian Benvenuti<benve(a)cisco.com>
> Signed-off-by: David Wang<dwang2(a)cisco.com>
> ---
> src/util/pci.c | 42 ++++++++++++++++++++++++++++++++++++++++++
> src/util/pci.h | 2 ++
> 2 files changed, 44 insertions(+), 0 deletions(-)
>
>
> diff --git a/src/util/pci.c b/src/util/pci.c
> index a79c164..d2deeef 100644
> --- a/src/util/pci.c
> +++ b/src/util/pci.c
> @@ -1679,3 +1679,45 @@ int pciDeviceIsAssignable(pciDevice *dev,
>
> return 1;
> }
> +
> +/*
> + * This function returns the network device name
> + * of a pci device
> + */
> +int
> +pciDeviceGetNetName(char *device_link_sysfs_path, char **netname)
> +{
> + char *pcidev_sysfs_net_path = NULL;
> + int ret = -1;
> + DIR *dir = NULL;
> + struct dirent *entry = NULL;
> +
> + if (virBuildPath(&pcidev_sysfs_net_path, device_link_sysfs_path,
> + "net") == -1) {
> + virReportOOMError();
> + return -1;
> + }
> +
> + dir = opendir(pcidev_sysfs_net_path);
> + if (dir == NULL)
> + goto out;
> +
> + while ((entry = readdir(dir))) {
> + if (entry->d_name[0] == '.' ||
The above check makes the following one obsolete. If all entries with
first letter '.' can be skipped, then you could just keep the first one,
otherwise I'd also use !strcmp(entry->d_name, ".").
Agree, yes I should use strcmp. Did not think of all cases here because the
net dir normally contains one entry. I will also revisit this check for
cases when there might be more net devices associated with a pci device.
> + !strcmp(entry->d_name, ".."))
> + continue;
> +
> + /* Assume a single directory entry */
> + *netname = strdup(entry->d_name);
> + ret = 0;
> + break;
> + }
> +
> + if (dir)
> + closedir(dir);
Check for 'dir != NULL) is not necessary due to goto above.
Yes will fix. Thanks stefan.
> +
> +out:
> + VIR_FREE(pcidev_sysfs_net_path);
> +
> + return ret;
> +}
> diff --git a/src/util/pci.h b/src/util/pci.h
> index a351baf..fa25472 100644
> --- a/src/util/pci.h
> +++ b/src/util/pci.h
> @@ -74,4 +74,6 @@ int pciDeviceIsAssignable(pciDevice *dev,
> int strict_acs_check);
> int pciWaitForDeviceCleanup(pciDevice *dev, const char *matcher);
>
> +int pciDeviceGetNetName(char *device_link_sysfs_path, char **netname);
> +
> #endif /* __VIR_PCI_H__ */
>
Stefan
6:57 p.m.
New subject: [libvirt] [PATCH 2/3 RFC] Add functions to get sriov PF/VF relationship of a network interface
From: Roopa Prabhu <roprabhu(a)cisco.com>
This patch adds helper functions to derive the PF/VF relationship of an sriov
network device
Signed-off-by: Roopa Prabhu <roprabhu(a)cisco.com>
Signed-off-by: Christian Benvenuti <benve(a)cisco.com>
Signed-off-by: David Wang <dwang2(a)cisco.com>
---
src/util/interface.c | 122 ++++++++++++++++++++++++++++++++++++++++++++++++++
src/util/interface.h | 8 +++
2 files changed, 130 insertions(+), 0 deletions(-)
diff --git a/src/util/interface.c b/src/util/interface.c
index f5eecfb..5ee5703 100644
--- a/src/util/interface.c
+++ b/src/util/interface.c
@@ -30,6 +30,7 @@
#include <sys/ioctl.h>
#include <fcntl.h>
#include <netinet/in.h>
+#include <dirent.h>
#ifdef __linux__
# include <linux/if.h>
@@ -45,6 +46,8 @@
#include "virfile.h"
#include "memory.h"
#include "netlink.h"
+#include "pci.h"
+#include "logging.h"
#define VIR_FROM_THIS VIR_FROM_NET
@@ -1197,3 +1200,122 @@ ifaceRestoreMacAddress(const char *linkdev,
return rc;
}
+
+int ifaceIsVF(const char *ifname)
+{
+ char *if_sysfs_device_link = NULL;
+ int ret;
+
+ if (virAsprintf(&if_sysfs_device_link, NET_SYSFS "%s/device/physfn",
+ ifname) < 0) {
+ virReportOOMError();
+ return -1;
+ }
+
+ ret = virFileExists(if_sysfs_device_link);
+
+ VIR_FREE(if_sysfs_device_link);
+
+ return ret;
+}
+
+int ifaceGetVFIndex(const char *pfname, const char *vfname,
+ int *vf_index)
+{
+ int ret = -1;
+ DIR *dir = NULL;
+ struct dirent *entry = NULL;
+ char *pf_sysfs_device_link = NULL, *vf_sysfs_device_link = NULL;
+ char *vf_sysfs_device = NULL;
+ char errbuf[64];
+
+ if (virAsprintf(&pf_sysfs_device_link, NET_SYSFS "%s/device",
+ pfname) < 0) {
+ virReportOOMError();
+ return -1;
+ }
+
+ if (virAsprintf(&vf_sysfs_device_link, NET_SYSFS "%s/device",
+ vfname) < 0) {
+ VIR_FREE(pf_sysfs_device_link);
+ virReportOOMError();
+ return -1;
+ }
+
+ vf_sysfs_device = canonicalize_file_name(vf_sysfs_device_link);
+ if (vf_sysfs_device == NULL) {
+ memset(errbuf, '\0', sizeof(errbuf));
+ VIR_ERROR(_("Failed to resolve device link '%s':
'%s'"),
+ vf_sysfs_device_link,
+ virStrerror(errno, errbuf, sizeof(errbuf)));
+ VIR_FREE(pf_sysfs_device_link);
+ VIR_FREE(vf_sysfs_device_link);
+ return -1;
+ }
+
+ dir = opendir(pf_sysfs_device_link);
+ if (dir == NULL)
+ goto out;
+
+ while ((entry = readdir(dir))) {
+ if (STRPREFIX(entry->d_name, "virtfn")) {
+ char *device_link, *device_path;
+
+ if (virBuildPath(&device_link, pf_sysfs_device_link,
+ entry->d_name) == -1) {
+ virReportOOMError();
+ goto out;
+ }
+
+ device_path = canonicalize_file_name(device_link);
+ if (device_path == NULL) {
+ memset(errbuf, '\0', sizeof(errbuf));
+ VIR_ERROR(_("Failed to resolve device link '%s':
'%s'"),
+ device_link, virStrerror(errno, errbuf,
+ sizeof(errbuf)));
+ VIR_FREE(device_link);
+ goto out;
+ }
+
+ if (!strcmp(vf_sysfs_device, device_path)) {
+ *vf_index = atoi(entry->d_name + strlen("virtfn"));
+ ret = 0;
+ }
+
+ VIR_FREE(device_link);
+ VIR_FREE(device_path);
+
+ if ( ret == 0 )
+ break;
+ }
+ }
+
+ if (dir)
+ closedir(dir);
+
+out:
+
+ VIR_FREE(pf_sysfs_device_link);
+ VIR_FREE(vf_sysfs_device_link);
+ VIR_FREE(vf_sysfs_device);
+
+ return ret;
+}
+
+int ifaceGetPFName(const char *ifname, char **pfname)
+{
+ char *physfn_sysfs_path = NULL;
+ int ret = -1;
+
+ if (virAsprintf(&physfn_sysfs_path, NET_SYSFS "%s/device/physfn",
+ ifname) < 0) {
+ virReportOOMError();
+ return -1;
+ }
+
+ ret = pciDeviceGetNetName(physfn_sysfs_path, pfname);
+
+ VIR_FREE(physfn_sysfs_path);
+
+ return ret;
+}
diff --git a/src/util/interface.h b/src/util/interface.h
index 9647653..f2c84f8 100644
--- a/src/util/interface.h
+++ b/src/util/interface.h
@@ -26,6 +26,8 @@ struct nlattr;
# include "datatypes.h"
# include "network.h"
+#define NET_SYSFS "/sys/class/net/"
+
int ifaceGetFlags(const char *name, short *flags);
int ifaceIsUp(const char *name, bool *up);
@@ -76,4 +78,10 @@ int ifaceReplaceMacAddress(const unsigned char *macaddress,
int ifaceRestoreMacAddress(const char *linkdev,
const char *stateDir);
+int ifaceIsVF(const char *ifname);
+
+int ifaceGetVFIndex(const char *pfname, const char *vfname, int *vf_index);
+
+int ifaceGetPFName(const char *ifname, char **pfname);
+
#endif /* __VIR_INTERFACE_H__ */
8:10 p.m.
New subject: [libvirt] [PATCH 2/3 RFC] Add functions to get sriov PF/VF relationship of a network interface
On 08/01/2011 07:57 PM, Roopa Prabhu wrote:
From: Roopa Prabhu<roprabhu(a)cisco.com>
This patch adds helper functions to derive the PF/VF relationship of an sriov
network device
Signed-off-by: Roopa Prabhu<roprabhu(a)cisco.com>
Signed-off-by: Christian Benvenuti<benve(a)cisco.com>
Signed-off-by: David Wang<dwang2(a)cisco.com>
---
src/util/interface.c | 122 ++++++++++++++++++++++++++++++++++++++++++++++++++
src/util/interface.h | 8 +++
2 files changed, 130 insertions(+), 0 deletions(-)
diff --git a/src/util/interface.c b/src/util/interface.c
index f5eecfb..5ee5703 100644
--- a/src/util/interface.c
+++ b/src/util/interface.c
@@ -30,6 +30,7 @@
#include<sys/ioctl.h>
#include<fcntl.h>
#include<netinet/in.h>
+#include<dirent.h>
#ifdef __linux__
# include<linux/if.h>
@@ -45,6 +46,8 @@
#include "virfile.h"
#include "memory.h"
#include "netlink.h"
+#include "pci.h"
+#include "logging.h"
#define VIR_FROM_THIS VIR_FROM_NET
@@ -1197,3 +1200,122 @@ ifaceRestoreMacAddress(const char *linkdev,
return rc;
}
+
+int ifaceIsVF(const char *ifname)
+{
+ char *if_sysfs_device_link = NULL;
+ int ret;
+
+ if (virAsprintf(&if_sysfs_device_link, NET_SYSFS "%s/device/physfn",
+ ifname)< 0) {
+ virReportOOMError();
+ return -1;
+ }
+
+ ret = virFileExists(if_sysfs_device_link);
+
+ VIR_FREE(if_sysfs_device_link);
+
+ return ret;
+}
+
+int ifaceGetVFIndex(const char *pfname, const char *vfname,
+ int *vf_index)
+{
+ int ret = -1;
+ DIR *dir = NULL;
+ struct dirent *entry = NULL;
+ char *pf_sysfs_device_link = NULL, *vf_sysfs_device_link = NULL;
+ char *vf_sysfs_device = NULL;
+ char errbuf[64];
+
+ if (virAsprintf(&pf_sysfs_device_link, NET_SYSFS "%s/device",
+ pfname)< 0) {
+ virReportOOMError();
+ return -1;
+ }
+
+ if (virAsprintf(&vf_sysfs_device_link, NET_SYSFS "%s/device",
+ vfname)< 0) {
+ VIR_FREE(pf_sysfs_device_link);
+ virReportOOMError();
+ return -1;
+ }
+
+ vf_sysfs_device = canonicalize_file_name(vf_sysfs_device_link);
+ if (vf_sysfs_device == NULL) {
+ memset(errbuf, '\0', sizeof(errbuf));
+ VIR_ERROR(_("Failed to resolve device link '%s':
'%s'"),
+ vf_sysfs_device_link,
+ virStrerror(errno, errbuf, sizeof(errbuf)));
+ VIR_FREE(pf_sysfs_device_link);
+ VIR_FREE(vf_sysfs_device_link);
+ return -1;
+ }
+
+ dir = opendir(pf_sysfs_device_link);
+ if (dir == NULL)
+ goto out;
+
+ while ((entry = readdir(dir))) {
+ if (STRPREFIX(entry->d_name, "virtfn")) {
+ char *device_link, *device_path;
+
+ if (virBuildPath(&device_link, pf_sysfs_device_link,
+ entry->d_name) == -1) {
+ virReportOOMError();
+ goto out;
+ }
+
+ device_path = canonicalize_file_name(device_link);
+ if (device_path == NULL) {
+ memset(errbuf, '\0', sizeof(errbuf));
+ VIR_ERROR(_("Failed to resolve device link '%s':
'%s'"),
+ device_link, virStrerror(errno, errbuf,
+ sizeof(errbuf)));
+ VIR_FREE(device_link);
+ goto out;
+ }
+
+ if (!strcmp(vf_sysfs_device, device_path)) {
+ *vf_index = atoi(entry->d_name + strlen("virtfn"));
This looks odd. Can you explain?
+ ret = 0;
+ }
+
+ VIR_FREE(device_link);
+ VIR_FREE(device_path);
+
+ if ( ret == 0 )
+ break;
+ }
+ }
+
+ if (dir)
+ closedir(dir);
In this case the above test should be after the 'out:' label not to
cause a memory leak with the goto's above.
+
+out:
+
+ VIR_FREE(pf_sysfs_device_link);
+ VIR_FREE(vf_sysfs_device_link);
+ VIR_FREE(vf_sysfs_device);
+
+ return ret;
+}
+
+int ifaceGetPFName(const char *ifname, char **pfname)
+{
+ char *physfn_sysfs_path = NULL;
+ int ret = -1;
+
+ if (virAsprintf(&physfn_sysfs_path, NET_SYSFS "%s/device/physfn",
+ ifname)< 0) {
+ virReportOOMError();
+ return -1;
+ }
+
+ ret = pciDeviceGetNetName(physfn_sysfs_path, pfname);
+
+ VIR_FREE(physfn_sysfs_path);
+
+ return ret;
+}
diff --git a/src/util/interface.h b/src/util/interface.h
index 9647653..f2c84f8 100644
--- a/src/util/interface.h
+++ b/src/util/interface.h
@@ -26,6 +26,8 @@ struct nlattr;
# include "datatypes.h"
# include "network.h"
+#define NET_SYSFS "/sys/class/net/"
+
int ifaceGetFlags(const char *name, short *flags);
int ifaceIsUp(const char *name, bool *up);
@@ -76,4 +78,10 @@ int ifaceReplaceMacAddress(const unsigned char *macaddress,
int ifaceRestoreMacAddress(const char *linkdev,
const char *stateDir);
+int ifaceIsVF(const char *ifname);
+
+int ifaceGetVFIndex(const char *pfname, const char *vfname, int *vf_index);
+
+int ifaceGetPFName(const char *ifname, char **pfname);
+
#endif /* __VIR_INTERFACE_H__ */
Stefan
7:46 a.m.
New subject: [libvirt] [PATCH 2/3 RFC] Add functions to get sriov PF/VF relationship of a network interface
On 8/1/11 6:10 PM, "Stefan Berger" <stefanb(a)linux.vnet.ibm.com> wrote:
On 08/01/2011 07:57 PM, Roopa Prabhu wrote:
> From: Roopa Prabhu<roprabhu(a)cisco.com>
>
> This patch adds helper functions to derive the PF/VF relationship of an sriov
> network device
>
> Signed-off-by: Roopa Prabhu<roprabhu(a)cisco.com>
> Signed-off-by: Christian Benvenuti<benve(a)cisco.com>
> Signed-off-by: David Wang<dwang2(a)cisco.com>
> ---
> src/util/interface.c | 122
> ++++++++++++++++++++++++++++++++++++++++++++++++++
> src/util/interface.h | 8 +++
> 2 files changed, 130 insertions(+), 0 deletions(-)
>
>
> diff --git a/src/util/interface.c b/src/util/interface.c
> index f5eecfb..5ee5703 100644
> --- a/src/util/interface.c
> +++ b/src/util/interface.c
> @@ -30,6 +30,7 @@
> #include<sys/ioctl.h>
> #include<fcntl.h>
> #include<netinet/in.h>
> +#include<dirent.h>
>
> #ifdef __linux__
> # include<linux/if.h>
> @@ -45,6 +46,8 @@
> #include "virfile.h"
> #include "memory.h"
> #include "netlink.h"
> +#include "pci.h"
> +#include "logging.h"
>
> #define VIR_FROM_THIS VIR_FROM_NET
>
> @@ -1197,3 +1200,122 @@ ifaceRestoreMacAddress(const char *linkdev,
>
> return rc;
> }
> +
> +int ifaceIsVF(const char *ifname)
> +{
> + char *if_sysfs_device_link = NULL;
> + int ret;
> +
> + if (virAsprintf(&if_sysfs_device_link, NET_SYSFS
"%s/device/physfn",
> + ifname)< 0) {
> + virReportOOMError();
> + return -1;
> + }
> +
> + ret = virFileExists(if_sysfs_device_link);
> +
> + VIR_FREE(if_sysfs_device_link);
> +
> + return ret;
> +}
> +
> +int ifaceGetVFIndex(const char *pfname, const char *vfname,
> + int *vf_index)
> +{
> + int ret = -1;
> + DIR *dir = NULL;
> + struct dirent *entry = NULL;
> + char *pf_sysfs_device_link = NULL, *vf_sysfs_device_link = NULL;
> + char *vf_sysfs_device = NULL;
> + char errbuf[64];
> +
> + if (virAsprintf(&pf_sysfs_device_link, NET_SYSFS "%s/device",
> + pfname)< 0) {
> + virReportOOMError();
> + return -1;
> + }
> +
> + if (virAsprintf(&vf_sysfs_device_link, NET_SYSFS "%s/device",
> + vfname)< 0) {
> + VIR_FREE(pf_sysfs_device_link);
> + virReportOOMError();
> + return -1;
> + }
> +
> + vf_sysfs_device = canonicalize_file_name(vf_sysfs_device_link);
> + if (vf_sysfs_device == NULL) {
> + memset(errbuf, '\0', sizeof(errbuf));
> + VIR_ERROR(_("Failed to resolve device link '%s':
'%s'"),
> + vf_sysfs_device_link,
> + virStrerror(errno, errbuf, sizeof(errbuf)));
> + VIR_FREE(pf_sysfs_device_link);
> + VIR_FREE(vf_sysfs_device_link);
> + return -1;
> + }
> +
> + dir = opendir(pf_sysfs_device_link);
> + if (dir == NULL)
> + goto out;
> +
> + while ((entry = readdir(dir))) {
> + if (STRPREFIX(entry->d_name, "virtfn")) {
> + char *device_link, *device_path;
> +
> + if (virBuildPath(&device_link, pf_sysfs_device_link,
> + entry->d_name) == -1) {
> + virReportOOMError();
> + goto out;
> + }
> +
> + device_path = canonicalize_file_name(device_link);
> + if (device_path == NULL) {
> + memset(errbuf, '\0', sizeof(errbuf));
> + VIR_ERROR(_("Failed to resolve device link '%s':
'%s'"),
> + device_link, virStrerror(errno, errbuf,
> + sizeof(errbuf)));
> + VIR_FREE(device_link);
> + goto out;
> + }
> +
> + if (!strcmp(vf_sysfs_device, device_path)) {
> + *vf_index = atoi(entry->d_name + strlen("virtfn"));
This looks odd. Can you explain?
The PF device sysfs directory has links with the name "virtfn<vf_index>"
pointing to the VF's pci device.
Example:
# ls -l virtfn*
lrwxrwxrwx. 1 root root 0 Jul 27 11:09 virtfn0 -> ../0000:1e:00.1
lrwxrwxrwx. 1 root root 0 Jul 27 11:09 virtfn1 -> ../0000:1e:00.2
lrwxrwxrwx. 1 root root 0 Jul 27 11:09 virtfn10 -> ../0000:1e:01.3
lrwxrwxrwx. 1 root root 0 Jul 27 11:09 virtfn11 -> ../0000:1e:01.4
lrwxrwxrwx. 1 root root 0 Jul 27 11:09 virtfn12 -> ../0000:1e:01.5
I see if the virt function link is pointing to the pci device of the VF I
am looking for. If it is, then I try to get the vf index from the virtual
function link name (I just need the number in "virtfn<vf_index>".
This is one way to get the vf index. The other way is to get it by reading
the pci config space of the PF, which the node device driver uses.
> + ret = 0;
> + }
> +
> + VIR_FREE(device_link);
> + VIR_FREE(device_path);
> +
> + if ( ret == 0 )
> + break;
> + }
> + }
> +
> + if (dir)
> + closedir(dir);
In this case the above test should be after the 'out:' label not to
cause a memory leak with the goto's above.
Thanks for catching it. Exactly similar lines of code exists in the previous
patch. There was a bug in the out label location in previous patch. When I
fixed the previous patch I accidently made the change in this patch too
introducing a leak here. :) Will fix it. Thanks stefan.
> +
> +out:
> +
> + VIR_FREE(pf_sysfs_device_link);
> + VIR_FREE(vf_sysfs_device_link);
> + VIR_FREE(vf_sysfs_device);
> +
> + return ret;
> +}
> +
> +int ifaceGetPFName(const char *ifname, char **pfname)
> +{
> + char *physfn_sysfs_path = NULL;
> + int ret = -1;
> +
> + if (virAsprintf(&physfn_sysfs_path, NET_SYSFS "%s/device/physfn",
> + ifname)< 0) {
> + virReportOOMError();
> + return -1;
> + }
> +
> + ret = pciDeviceGetNetName(physfn_sysfs_path, pfname);
> +
> + VIR_FREE(physfn_sysfs_path);
> +
> + return ret;
> +}
> diff --git a/src/util/interface.h b/src/util/interface.h
> index 9647653..f2c84f8 100644
> --- a/src/util/interface.h
> +++ b/src/util/interface.h
> @@ -26,6 +26,8 @@ struct nlattr;
> # include "datatypes.h"
> # include "network.h"
>
> +#define NET_SYSFS "/sys/class/net/"
> +
> int ifaceGetFlags(const char *name, short *flags);
> int ifaceIsUp(const char *name, bool *up);
>
> @@ -76,4 +78,10 @@ int ifaceReplaceMacAddress(const unsigned char
> *macaddress,
> int ifaceRestoreMacAddress(const char *linkdev,
> const char *stateDir);
>
> +int ifaceIsVF(const char *ifname);
> +
> +int ifaceGetVFIndex(const char *pfname, const char *vfname, int *vf_index);
> +
> +int ifaceGetPFName(const char *ifname, char **pfname);
> +
> #endif /* __VIR_INTERFACE_H__ */
>
Stefan
8:46 a.m.
New subject: [libvirt] [PATCH 2/3 RFC] Add functions to get sriov PF/VF relationship of a network interface
On 08/02/2011 08:46 AM, Roopa Prabhu wrote:
On 8/1/11 6:10 PM, "Stefan Berger"<stefanb(a)linux.vnet.ibm.com> wrote:
> On 08/01/2011 07:57 PM, Roopa Prabhu wrote:
>> From: Roopa Prabhu<roprabhu(a)cisco.com>
>>
>> This patch adds helper functions to derive the PF/VF relationship of an sriov
>> network device
>>
>> Signed-off-by: Roopa Prabhu<roprabhu(a)cisco.com>
>> Signed-off-by: Christian Benvenuti<benve(a)cisco.com>
>> Signed-off-by: David Wang<dwang2(a)cisco.com>
>> ---
>> src/util/interface.c | 122
>> ++++++++++++++++++++++++++++++++++++++++++++++++++
>> src/util/interface.h | 8 +++
>> 2 files changed, 130 insertions(+), 0 deletions(-)
>>
>>
>> diff --git a/src/util/interface.c b/src/util/interface.c
>> index f5eecfb..5ee5703 100644
>> --- a/src/util/interface.c
>> +++ b/src/util/interface.c
>> @@ -30,6 +30,7 @@
>> #include<sys/ioctl.h>
>> #include<fcntl.h>
>> #include<netinet/in.h>
>> +#include<dirent.h>
>>
>> #ifdef __linux__
>> # include<linux/if.h>
>> @@ -45,6 +46,8 @@
>> #include "virfile.h"
>> #include "memory.h"
>> #include "netlink.h"
>> +#include "pci.h"
>> +#include "logging.h"
>>
>> #define VIR_FROM_THIS VIR_FROM_NET
>>
>> @@ -1197,3 +1200,122 @@ ifaceRestoreMacAddress(const char *linkdev,
>>
>> return rc;
>> }
>> +
>> +int ifaceIsVF(const char *ifname)
>> +{
>> + char *if_sysfs_device_link = NULL;
>> + int ret;
>> +
>> + if (virAsprintf(&if_sysfs_device_link, NET_SYSFS
"%s/device/physfn",
>> + ifname)< 0) {
>> + virReportOOMError();
>> + return -1;
>> + }
>> +
>> + ret = virFileExists(if_sysfs_device_link);
>> +
>> + VIR_FREE(if_sysfs_device_link);
>> +
>> + return ret;
>> +}
>> +
>> +int ifaceGetVFIndex(const char *pfname, const char *vfname,
>> + int *vf_index)
>> +{
>> + int ret = -1;
>> + DIR *dir = NULL;
>> + struct dirent *entry = NULL;
>> + char *pf_sysfs_device_link = NULL, *vf_sysfs_device_link = NULL;
>> + char *vf_sysfs_device = NULL;
>> + char errbuf[64];
>> +
>> + if (virAsprintf(&pf_sysfs_device_link, NET_SYSFS "%s/device",
>> + pfname)< 0) {
>> + virReportOOMError();
>> + return -1;
>> + }
>> +
>> + if (virAsprintf(&vf_sysfs_device_link, NET_SYSFS "%s/device",
>> + vfname)< 0) {
>> + VIR_FREE(pf_sysfs_device_link);
>> + virReportOOMError();
>> + return -1;
>> + }
>> +
>> + vf_sysfs_device = canonicalize_file_name(vf_sysfs_device_link);
>> + if (vf_sysfs_device == NULL) {
>> + memset(errbuf, '\0', sizeof(errbuf));
>> + VIR_ERROR(_("Failed to resolve device link '%s':
'%s'"),
>> + vf_sysfs_device_link,
>> + virStrerror(errno, errbuf, sizeof(errbuf)));
>> + VIR_FREE(pf_sysfs_device_link);
>> + VIR_FREE(vf_sysfs_device_link);
>> + return -1;
>> + }
>> +
>> + dir = opendir(pf_sysfs_device_link);
>> + if (dir == NULL)
>> + goto out;
>> +
>> + while ((entry = readdir(dir))) {
>> + if (STRPREFIX(entry->d_name, "virtfn")) {
>> + char *device_link, *device_path;
>> +
>> + if (virBuildPath(&device_link, pf_sysfs_device_link,
>> + entry->d_name) == -1) {
>> + virReportOOMError();
>> + goto out;
>> + }
>> +
>> + device_path = canonicalize_file_name(device_link);
>> + if (device_path == NULL) {
>> + memset(errbuf, '\0', sizeof(errbuf));
>> + VIR_ERROR(_("Failed to resolve device link '%s':
'%s'"),
>> + device_link, virStrerror(errno, errbuf,
>> + sizeof(errbuf)));
>> + VIR_FREE(device_link);
>> + goto out;
>> + }
>> +
>> + if (!strcmp(vf_sysfs_device, device_path)) {
>> + *vf_index = atoi(entry->d_name +
strlen("virtfn"));
> This looks odd. Can you explain?
The PF device sysfs directory has links with the name "virtfn<vf_index>"
pointing to the VF's pci device.
Example:
# ls -l virtfn*
lrwxrwxrwx. 1 root root 0 Jul 27 11:09 virtfn0 -> ../0000:1e:00.1
lrwxrwxrwx. 1 root root 0 Jul 27 11:09 virtfn1 -> ../0000:1e:00.2
lrwxrwxrwx. 1 root root 0 Jul 27 11:09 virtfn10 -> ../0000:1e:01.3
lrwxrwxrwx. 1 root root 0 Jul 27 11:09 virtfn11 -> ../0000:1e:01.4
lrwxrwxrwx. 1 root root 0 Jul 27 11:09 virtfn12 -> ../0000:1e:01.5
I see if the virt function link is pointing to the pci device of the VF I
am looking for. If it is, then I try to get the vf index from the virtual
function link name (I just need the number in "virtfn<vf_index>".
This is one way to get the vf index. The other way is to get it by reading
the pci config space of the PF, which the node device driver uses.
In that case I'd suggest to use 'if (sscanf(entry->d_name,
"virtfn%u",
&vf_index) != 1) { error }'
Stefan
>> + ret = 0;
>> + }
>> +
>> + VIR_FREE(device_link);
>> + VIR_FREE(device_path);
>> +
>> + if ( ret == 0 )
>> + break;
>> + }
>> + }
>> +
>> + if (dir)
>> + closedir(dir);
> In this case the above test should be after the 'out:' label not to
> cause a memory leak with the goto's above.
>
Thanks for catching it. Exactly similar lines of code exists in the previous
patch. There was a bug in the out label location in previous patch. When I
fixed the previous patch I accidently made the change in this patch too
introducing a leak here. :) Will fix it. Thanks stefan.
>> +
>> +out:
>> +
>> + VIR_FREE(pf_sysfs_device_link);
>> + VIR_FREE(vf_sysfs_device_link);
>> + VIR_FREE(vf_sysfs_device);
>> +
>> + return ret;
>> +}
>> +
>> +int ifaceGetPFName(const char *ifname, char **pfname)
>> +{
>> + char *physfn_sysfs_path = NULL;
>> + int ret = -1;
>> +
>> + if (virAsprintf(&physfn_sysfs_path, NET_SYSFS
"%s/device/physfn",
>> + ifname)< 0) {
>> + virReportOOMError();
>> + return -1;
>> + }
>> +
>> + ret = pciDeviceGetNetName(physfn_sysfs_path, pfname);
>> +
>> + VIR_FREE(physfn_sysfs_path);
>> +
>> + return ret;
>> +}
>> diff --git a/src/util/interface.h b/src/util/interface.h
>> index 9647653..f2c84f8 100644
>> --- a/src/util/interface.h
>> +++ b/src/util/interface.h
>> @@ -26,6 +26,8 @@ struct nlattr;
>> # include "datatypes.h"
>> # include "network.h"
>>
>> +#define NET_SYSFS "/sys/class/net/"
>> +
>> int ifaceGetFlags(const char *name, short *flags);
>> int ifaceIsUp(const char *name, bool *up);
>>
>> @@ -76,4 +78,10 @@ int ifaceReplaceMacAddress(const unsigned char
>> *macaddress,
>> int ifaceRestoreMacAddress(const char *linkdev,
>> const char *stateDir);
>>
>> +int ifaceIsVF(const char *ifname);
>> +
>> +int ifaceGetVFIndex(const char *pfname, const char *vfname, int *vf_index);
>> +
>> +int ifaceGetPFName(const char *ifname, char **pfname);
>> +
>> #endif /* __VIR_INTERFACE_H__ */
>>
> Stefan
>
11:20 a.m.
New subject: [libvirt] [PATCH 2/3 RFC] Add functions to get sriov PF/VF relationship of a network interface
On 8/2/11 6:46 AM, "Stefan Berger" <stefanb(a)linux.vnet.ibm.com> wrote:
On 08/02/2011 08:46 AM, Roopa Prabhu wrote:
>
>
> On 8/1/11 6:10 PM, "Stefan Berger"<stefanb(a)linux.vnet.ibm.com>
wrote:
>
>> On 08/01/2011 07:57 PM, Roopa Prabhu wrote:
>>> From: Roopa Prabhu<roprabhu(a)cisco.com>
>>>
>>> This patch adds helper functions to derive the PF/VF relationship of an
>>> sriov
>>> network device
>>>
>>> Signed-off-by: Roopa Prabhu<roprabhu(a)cisco.com>
>>> Signed-off-by: Christian Benvenuti<benve(a)cisco.com>
>>> Signed-off-by: David Wang<dwang2(a)cisco.com>
>>> ---
>>> src/util/interface.c | 122
>>> ++++++++++++++++++++++++++++++++++++++++++++++++++
>>> src/util/interface.h | 8 +++
>>> 2 files changed, 130 insertions(+), 0 deletions(-)
>>>
>>>
>>> diff --git a/src/util/interface.c b/src/util/interface.c
>>> index f5eecfb..5ee5703 100644
>>> --- a/src/util/interface.c
>>> +++ b/src/util/interface.c
>>> @@ -30,6 +30,7 @@
>>> #include<sys/ioctl.h>
>>> #include<fcntl.h>
>>> #include<netinet/in.h>
>>> +#include<dirent.h>
>>>
>>> #ifdef __linux__
>>> # include<linux/if.h>
>>> @@ -45,6 +46,8 @@
>>> #include "virfile.h"
>>> #include "memory.h"
>>> #include "netlink.h"
>>> +#include "pci.h"
>>> +#include "logging.h"
>>>
>>> #define VIR_FROM_THIS VIR_FROM_NET
>>>
>>> @@ -1197,3 +1200,122 @@ ifaceRestoreMacAddress(const char *linkdev,
>>>
>>> return rc;
>>> }
>>> +
>>> +int ifaceIsVF(const char *ifname)
>>> +{
>>> + char *if_sysfs_device_link = NULL;
>>> + int ret;
>>> +
>>> + if (virAsprintf(&if_sysfs_device_link, NET_SYSFS
"%s/device/physfn",
>>> + ifname)< 0) {
>>> + virReportOOMError();
>>> + return -1;
>>> + }
>>> +
>>> + ret = virFileExists(if_sysfs_device_link);
>>> +
>>> + VIR_FREE(if_sysfs_device_link);
>>> +
>>> + return ret;
>>> +}
>>> +
>>> +int ifaceGetVFIndex(const char *pfname, const char *vfname,
>>> + int *vf_index)
>>> +{
>>> + int ret = -1;
>>> + DIR *dir = NULL;
>>> + struct dirent *entry = NULL;
>>> + char *pf_sysfs_device_link = NULL, *vf_sysfs_device_link = NULL;
>>> + char *vf_sysfs_device = NULL;
>>> + char errbuf[64];
>>> +
>>> + if (virAsprintf(&pf_sysfs_device_link, NET_SYSFS
"%s/device",
>>> + pfname)< 0) {
>>> + virReportOOMError();
>>> + return -1;
>>> + }
>>> +
>>> + if (virAsprintf(&vf_sysfs_device_link, NET_SYSFS
"%s/device",
>>> + vfname)< 0) {
>>> + VIR_FREE(pf_sysfs_device_link);
>>> + virReportOOMError();
>>> + return -1;
>>> + }
>>> +
>>> + vf_sysfs_device = canonicalize_file_name(vf_sysfs_device_link);
>>> + if (vf_sysfs_device == NULL) {
>>> + memset(errbuf, '\0', sizeof(errbuf));
>>> + VIR_ERROR(_("Failed to resolve device link '%s':
'%s'"),
>>> + vf_sysfs_device_link,
>>> + virStrerror(errno, errbuf, sizeof(errbuf)));
>>> + VIR_FREE(pf_sysfs_device_link);
>>> + VIR_FREE(vf_sysfs_device_link);
>>> + return -1;
>>> + }
>>> +
>>> + dir = opendir(pf_sysfs_device_link);
>>> + if (dir == NULL)
>>> + goto out;
>>> +
>>> + while ((entry = readdir(dir))) {
>>> + if (STRPREFIX(entry->d_name, "virtfn")) {
>>> + char *device_link, *device_path;
>>> +
>>> + if (virBuildPath(&device_link, pf_sysfs_device_link,
>>> + entry->d_name) == -1) {
>>> + virReportOOMError();
>>> + goto out;
>>> + }
>>> +
>>> + device_path = canonicalize_file_name(device_link);
>>> + if (device_path == NULL) {
>>> + memset(errbuf, '\0', sizeof(errbuf));
>>> + VIR_ERROR(_("Failed to resolve device link
'%s': '%s'"),
>>> + device_link, virStrerror(errno, errbuf,
>>> + sizeof(errbuf)));
>>> + VIR_FREE(device_link);
>>> + goto out;
>>> + }
>>> +
>>> + if (!strcmp(vf_sysfs_device, device_path)) {
>>> + *vf_index = atoi(entry->d_name +
strlen("virtfn"));
>> This looks odd. Can you explain?
> The PF device sysfs directory has links with the name
"virtfn<vf_index>"
> pointing to the VF's pci device.
>
> Example:
> # ls -l virtfn*
> lrwxrwxrwx. 1 root root 0 Jul 27 11:09 virtfn0 -> ../0000:1e:00.1
> lrwxrwxrwx. 1 root root 0 Jul 27 11:09 virtfn1 -> ../0000:1e:00.2
> lrwxrwxrwx. 1 root root 0 Jul 27 11:09 virtfn10 -> ../0000:1e:01.3
> lrwxrwxrwx. 1 root root 0 Jul 27 11:09 virtfn11 -> ../0000:1e:01.4
> lrwxrwxrwx. 1 root root 0 Jul 27 11:09 virtfn12 -> ../0000:1e:01.5
>
> I see if the virt function link is pointing to the pci device of the VF I
> am looking for. If it is, then I try to get the vf index from the virtual
> function link name (I just need the number in "virtfn<vf_index>".
> This is one way to get the vf index. The other way is to get it by reading
> the pci config space of the PF, which the node device driver uses.
>
In that case I'd suggest to use 'if (sscanf(entry->d_name,
"virtfn%u",
&vf_index) != 1) { error }'
Ok sounds good. Thanks.
6:57 p.m.
New subject: [libvirt] [PATCH 3/3 RFC] macvtap: Fix getPhysfn to get the PF of a direct attach network interface
From: Roopa Prabhu <roprabhu(a)cisco.com>
This patch adds code to the existing getPhysfn to get the PF device name
and VF index if the linkdev is a sriov VF.
The idea is to send the port profile message to a PF if the direct attach
interface is a VF. Eventually interface.c is probably the right place for
getPhysfn
Signed-off-by: Roopa Prabhu <roprabhu(a)cisco.com>
Signed-off-by: Christian Benvenuti <benve(a)cisco.com>
Signed-off-by: David Wang <dwang2(a)cisco.com>
---
src/util/macvtap.c | 15 ++++++---------
1 files changed, 6 insertions(+), 9 deletions(-)
diff --git a/src/util/macvtap.c b/src/util/macvtap.c
index 0b00776..7fcea0d 100644
--- a/src/util/macvtap.c
+++ b/src/util/macvtap.c
@@ -948,18 +948,15 @@ getPhysfn(const char *linkdev,
char **physfndev)
{
int rc = 0;
- bool virtfn = false;
- if (virtfn) {
+ if (ifaceIsVF(linkdev)) {
- /* XXX: if linkdev is SR-IOV VF, then set vf = VF index */
- /* XXX: and set linkdev = PF device */
- /* XXX: need to use get_physical_function_linux() or */
- /* XXX: something like that to get PF */
- /* XXX: device and figure out VF index */
-
- rc = 1;
+ /* if linkdev is SR-IOV VF, then set vf = VF index */
+ /* and set physfndev = PF device */
+ rc = ifaceGetPFName(linkdev, physfndev);
+ if (!rc)
+ rc = ifaceGetVFIndex(*physfndev, linkdev, vf);
} else {
/* Not SR-IOV VF: physfndev is linkdev and VF index
8:12 p.m.
New subject: [libvirt] [PATCH 3/3 RFC] macvtap: Fix getPhysfn to get the PF of a direct attach network interface
On 08/01/2011 07:57 PM, Roopa Prabhu wrote:
From: Roopa Prabhu<roprabhu(a)cisco.com>
This patch adds code to the existing getPhysfn to get the PF device name
and VF index if the linkdev is a sriov VF.
The idea is to send the port profile message to a PF if the direct attach
interface is a VF. Eventually interface.c is probably the right place for
getPhysfn
Signed-off-by: Roopa Prabhu<roprabhu(a)cisco.com>
Signed-off-by: Christian Benvenuti<benve(a)cisco.com>
Signed-off-by: David Wang<dwang2(a)cisco.com>
---
src/util/macvtap.c | 15 ++++++---------
1 files changed, 6 insertions(+), 9 deletions(-)
diff --git a/src/util/macvtap.c b/src/util/macvtap.c
index 0b00776..7fcea0d 100644
--- a/src/util/macvtap.c
+++ b/src/util/macvtap.c
@@ -948,18 +948,15 @@ getPhysfn(const char *linkdev,
char **physfndev)
{
int rc = 0;
- bool virtfn = false;
- if (virtfn) {
+ if (ifaceIsVF(linkdev)) {
- /* XXX: if linkdev is SR-IOV VF, then set vf = VF index */
- /* XXX: and set linkdev = PF device */
- /* XXX: need to use get_physical_function_linux() or */
- /* XXX: something like that to get PF */
- /* XXX: device and figure out VF index */
-
- rc = 1;
+ /* if linkdev is SR-IOV VF, then set vf = VF index */
+ /* and set physfndev = PF device */
+ rc = ifaceGetPFName(linkdev, physfndev);
+ if (!rc)
+ rc = ifaceGetVFIndex(*physfndev, linkdev, vf);
} else {
/* Not SR-IOV VF: physfndev is linkdev and VF index
Looks good to me. ACK
Stefan
8:16 p.m.
On Mon, Aug 01, 2011 at 04:56:58PM -0700, Roopa Prabhu wrote:
This patch tries to fix getPhysFn in macvtap.c to get the physical
function(PF) of the direct attach interface, if the interface is a SR-IOV VF.
It derives the PF/VF relationship from sysfs.
There is some code to do this in node device driver. But it is local
to the node device driver . I did not see a clean way to use some of the
node device stuff here. The node device driver looks at PCI capabilities to
get the same information.
We should not have two implementations of this functionality in the
code. Either the node device code should be made to use this version
or vice versa.
This implementation tries to not get into PCI capability details and
just looks at sysfs paths to derive the PF-VF relationship
This patch series implements the following
01/3 - Add function to get the network interface name of a pci device
02/3 - Add functions to get sriov PF/VF relationship of a network interface
03/3 - macvtap: Fix getPhysfn to get the PF of a direct attach network interface
Signed-off-by: Roopa Prabhu <roprabhu(a)cisco.com>
Signed-off-by: Christian Benvenuti <benve(a)cisco.com>
Signed-off-by: David Wang <dwang2(a)cisco.com>
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6:15 a.m.
On Mon, Aug 01, 2011 at 09:16:09PM -0400, Dave Allan wrote:
On Mon, Aug 01, 2011 at 04:56:58PM -0700, Roopa Prabhu wrote:
> This patch tries to fix getPhysFn in macvtap.c to get the physical
> function(PF) of the direct attach interface, if the interface is a SR-IOV VF.
> It derives the PF/VF relationship from sysfs.
>
> There is some code to do this in node device driver. But it is local
> to the node device driver . I did not see a clean way to use some of the
> node device stuff here. The node device driver looks at PCI capabilities to
> get the same information.
We should not have two implementations of this functionality in the
code. Either the node device code should be made to use this version
or vice versa.
We already have a file src/util/pci.c that contains a bunch of helper
APIs for dealing with PCI devices. If we need some shared code between
macvtap and the node device driver, then we ought to put it in the pci.c
file
Regards,
Daniel
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7:54 a.m.
New subject: [libvirt] [PATCH 0/3 RFC] macvtap: Implement getPhysfn to support sending a port profile message for a VF to its PF
On 8/2/11 4:15 AM, "Daniel P. Berrange" <berrange(a)redhat.com> wrote:
On Mon, Aug 01, 2011 at 09:16:09PM -0400, Dave Allan wrote:
> On Mon, Aug 01, 2011 at 04:56:58PM -0700, Roopa Prabhu wrote:
>> This patch tries to fix getPhysFn in macvtap.c to get the physical
>> function(PF) of the direct attach interface, if the interface is a SR-IOV
>> VF.
>> It derives the PF/VF relationship from sysfs.
>>
>> There is some code to do this in node device driver. But it is local
>> to the node device driver . I did not see a clean way to use some of the
>> node device stuff here. The node device driver looks at PCI capabilities to
>> get the same information.
>
> We should not have two implementations of this functionality in the
> code. Either the node device code should be made to use this version
> or vice versa.
We already have a file src/util/pci.c that contains a bunch of helper
APIs for dealing with PCI devices. If we need some shared code between
macvtap and the node device driver, then we ought to put it in the pci.c
file
Yes, I looked at it and saw that I had to move quite a few node_device data
structures and code in src/util/pci.c. Wasn't sure if there was a reason for
it to not already exist in src/util/pci.c. So decided to post this patch as
RFC for specific directions.
From the patches that I posted, I still need the stuff that tries to
derive
the net device from the pci device. I will re-evaluate moving the node
device stuff to get PF-VF relationship information into src/util/pci.c and
repost the patches.
Thanks for the comments.
4861
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4862
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13 comments
4 participants
participants (4)
-
Daniel P. Berrange -
Dave Allan -
Roopa Prabhu -
Stefan Berger