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platform: detect SR-IOV support and allow changing the number of VFs

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(cherry picked from commit 0a7694cf81)
This commit is contained in:
Beniamino Galvani
2017-04-14 23:03:33 +02:00
parent 785b51ed02
commit 2511e27e76
4 changed files with 143 additions and 0 deletions
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91
src/platform/nm-linux-platform.c
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@@ -4604,6 +4604,30 @@ link_supports_vlans (NMPlatform *platform, int ifindex)
return nmp_utils_ethtool_supports_vlans (ifindex);
}
static gboolean
link_supports_sriov (NMPlatform *platform, int ifindex)
{
nm_auto_pop_netns NMPNetns *netns = NULL;
nm_auto_close int dirfd = -1;
char ifname[IFNAMSIZ];
int total = -1;
if (!nm_platform_netns_push (platform, &netns))
return FALSE;
dirfd = nm_platform_sysctl_open_netdir (platform, ifindex, ifname);
if (dirfd < 0)
return FALSE;
total = nm_platform_sysctl_get_int32 (platform,
NMP_SYSCTL_PATHID_NETDIR (dirfd,
ifname,
"device/sriov_totalvfs"),
-1);
return total > 0;
}
static NMPlatformError
link_set_address (NMPlatform *platform, int ifindex, gconstpointer address, size_t length)
{
@@ -4695,6 +4719,71 @@ nla_put_failure:
g_return_val_if_reached (FALSE);
}
static gboolean
link_set_sriov_num_vfs (NMPlatform *platform, int ifindex, guint num_vfs)
{
nm_auto_pop_netns NMPNetns *netns = NULL;
nm_auto_close int dirfd = -1;
int total, current;
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;
dirfd = nm_platform_sysctl_open_netdir (platform, ifindex, ifname);
if (!dirfd)
return FALSE;
total = nm_platform_sysctl_get_int32 (platform,
NMP_SYSCTL_PATHID_NETDIR (dirfd,
ifname,
"device/sriov_totalvfs"),
-1);
if (total < 1)
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)
return TRUE;
if (current != 0) {
/* We need to destroy all other VFs before changing the 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));
return FALSE;
}
if (num_vfs == 0)
return TRUE;
}
/* Finally, set the desired value */
if (!nm_platform_sysctl_set (NM_PLATFORM_GET,
NMP_SYSCTL_PATHID_NETDIR (dirfd,
ifname,
"device/sriov_numvfs"),
nm_sprintf_buf (buf, "%d", num_vfs))) {
_LOGW ("link: couldn't set SR-IOV num_vfs to %d: %s", num_vfs, strerror (errno));
return FALSE;
}
return TRUE;
}
static char *
link_get_physical_port_id (NMPlatform *platform, int ifindex)
{
@@ -6845,6 +6934,7 @@ nm_linux_platform_class_init (NMLinuxPlatformClass *klass)
platform_class->link_set_address = link_set_address;
platform_class->link_get_permanent_address = link_get_permanent_address;
platform_class->link_set_mtu = link_set_mtu;
platform_class->link_set_sriov_num_vfs = link_set_sriov_num_vfs;
platform_class->link_get_physical_port_id = link_get_physical_port_id;
platform_class->link_get_dev_id = link_get_dev_id;
@@ -6853,6 +6943,7 @@ nm_linux_platform_class_init (NMLinuxPlatformClass *klass)
platform_class->link_supports_carrier_detect = link_supports_carrier_detect;
platform_class->link_supports_vlans = link_supports_vlans;
platform_class->link_supports_sriov = link_supports_sriov;
platform_class->link_enslave = link_enslave;
platform_class->link_release = link_release;