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platform: allow setting drivers-autoprobe on SR-IOV PFs

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It is possible to tell kernel not to automatically autoprobe drivers
for VFs. This is useful, for example, if the VF must be used by a VM.
This commit is contained in:
Beniamino Galvani
2018-05-23 14:11:14 +02:00
parent a2f12994b7
commit 7df3333879
5 changed files with 69 additions and 38 deletions
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73
src/platform/nm-linux-platform.c
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@@ -5528,16 +5528,18 @@ nla_put_failure:
}
static gboolean
link_set_sriov_num_vfs (NMPlatform *platform, int ifindex, guint num_vfs)
link_set_sriov_params (NMPlatform *platform,
int ifindex,
guint num_vfs,
int autoprobe)
{
nm_auto_pop_netns NMPNetns *netns = NULL;
nm_auto_close int dirfd = -1;
int total, current;
gboolean current_autoprobe;
guint total, current_num;
char ifname[IFNAMSIZ];
char buf[64];
_LOGD ("link: change %d: num VFs: %u", ifindex, num_vfs);
if (!nm_platform_netns_push (platform, &netns))
return FALSE;
@@ -5545,46 +5547,69 @@ link_set_sriov_num_vfs (NMPlatform *platform, int ifindex, guint num_vfs)
if (!dirfd)
return FALSE;
total = nm_platform_sysctl_get_int32 (platform,
NMP_SYSCTL_PATHID_NETDIR (dirfd,
ifname,
"device/sriov_totalvfs"),
-1);
if (total < 1)
total = nm_platform_sysctl_get_int_checked (platform,
NMP_SYSCTL_PATHID_NETDIR (dirfd,
ifname,
"device/sriov_totalvfs"),
10, 0, G_MAXUINT, 0);
if (errno)
return FALSE;
if (num_vfs > total) {
_LOGW ("link: %d only supports %u VFs (requested %u)", ifindex, total, num_vfs);
num_vfs = total;
}
current = nm_platform_sysctl_get_int32 (platform,
NMP_SYSCTL_PATHID_NETDIR (dirfd,
ifname,
"device/sriov_numvfs"),
-1);
if (current == num_vfs)
/*
* Take special care when setting new values:
* - don't touch anything if the right values are already set
* - to change the number of VFs or autoprobe we need to destroy existing VFs
* - the autoprobe setting is irrelevant when numvfs is zero
*/
current_num = nm_platform_sysctl_get_int_checked (platform,
NMP_SYSCTL_PATHID_NETDIR (dirfd,
ifname,
"device/sriov_numvfs"),
10, 0, G_MAXUINT, 0);
current_autoprobe = nm_platform_sysctl_get_int_checked (platform,
NMP_SYSCTL_PATHID_NETDIR (dirfd,
ifname,
"device/sriov_drivers_autoprobe"),
10, 0, G_MAXUINT, 0);
if ( current_num == num_vfs
&& (autoprobe == -1 || current_autoprobe == autoprobe))
return TRUE;
if (current != 0) {
/* We need to destroy all other VFs before changing the value */
if (current_num != 0) {
/* We need to destroy all other VFs before changing any value */
if (!nm_platform_sysctl_set (NM_PLATFORM_GET,
NMP_SYSCTL_PATHID_NETDIR (dirfd,
ifname,
"device/sriov_numvfs"),
"0")) {
_LOGW ("link: couldn't set SR-IOV num_vfs to %d: %s", 0, strerror (errno));
_LOGW ("link: couldn't reset SR-IOV num_vfs: %s", strerror (errno));
return FALSE;
}
if (num_vfs == 0)
return TRUE;
}
/* Finally, set the desired value */
if (num_vfs == 0)
return TRUE;
if ( autoprobe >= 0
&& current_autoprobe != autoprobe
&& !nm_platform_sysctl_set (NM_PLATFORM_GET,
NMP_SYSCTL_PATHID_NETDIR (dirfd,
ifname,
"device/sriov_drivers_autoprobe"),
nm_sprintf_buf (buf, "%d", autoprobe))) {
_LOGW ("link: couldn't set SR-IOV drivers-autoprobe to %d: %s", autoprobe, strerror (errno));
return FALSE;
}
if (!nm_platform_sysctl_set (NM_PLATFORM_GET,
NMP_SYSCTL_PATHID_NETDIR (dirfd,
ifname,
"device/sriov_numvfs"),
nm_sprintf_buf (buf, "%d", num_vfs))) {
nm_sprintf_buf (buf, "%u", num_vfs))) {
_LOGW ("link: couldn't set SR-IOV num_vfs to %d: %s", num_vfs, strerror (errno));
return FALSE;
}
@@ -7735,7 +7760,7 @@ nm_linux_platform_class_init (NMLinuxPlatformClass *klass)
platform_class->link_get_permanent_address = link_get_permanent_address;
platform_class->link_set_mtu = link_set_mtu;
platform_class->link_set_name = link_set_name;
platform_class->link_set_sriov_num_vfs = link_set_sriov_num_vfs;
platform_class->link_set_sriov_params = link_set_sriov_params;
platform_class->link_get_physical_port_id = link_get_physical_port_id;
platform_class->link_get_dev_id = link_get_dev_id;