Adding functionality to libvirt that will allow it
query the ethtool interface for the availability
of certain NIC HW offload features
---
src/conf/device_conf.h | 6 ++
src/conf/node_device_conf.c | 7 ++
src/conf/node_device_conf.h | 2 +
src/libvirt_private.syms | 1 +
src/node_device/node_device_udev.c | 4 ++
src/util/virnetdev.c | 134 +++++++++++++++++++++++++++++++++++++
src/util/virnetdev.h | 12 +++-
7 files changed, 165 insertions(+), 1 deletion(-)
diff --git a/src/conf/device_conf.h b/src/conf/device_conf.h
index 7256cdc..091f2f0 100644
--- a/src/conf/device_conf.h
+++ b/src/conf/device_conf.h
@@ -62,6 +62,12 @@ struct _virInterfaceLink {
unsigned int speed; /* link speed in Mbits per second */
};
+typedef struct _virDevFeature virDevFeature;
+typedef virDevFeature *virDevFeaturePtr;
+struct _virDevFeature {
+ char *name; /* device feature */
+};
+
int virDevicePCIAddressIsValid(virDevicePCIAddressPtr addr);
int virDevicePCIAddressParseXML(xmlNodePtr node,
diff --git a/src/conf/node_device_conf.c b/src/conf/node_device_conf.c
index a728a00..7f4dbfe 100644
--- a/src/conf/node_device_conf.c
+++ b/src/conf/node_device_conf.c
@@ -437,6 +437,12 @@ char *virNodeDeviceDefFormat(const virNodeDeviceDef *def)
virBufferEscapeString(&buf, "<address>%s</address>\n",
data->net.address);
virInterfaceLinkFormat(&buf, &data->net.lnk);
+ if (data->net.features) {
+ for (i = 0; i < data->net.nfeatures; i++) {
+ virBufferAsprintf(&buf, "<feature name='%s'/>\n",
+ data->net.features[i].name);
+ }
+ }
if (data->net.subtype != VIR_NODE_DEV_CAP_NET_LAST) {
const char *subtyp =
virNodeDevNetCapTypeToString(data->net.subtype);
@@ -1679,6 +1685,7 @@ void virNodeDevCapsDefFree(virNodeDevCapsDefPtr caps)
case VIR_NODE_DEV_CAP_NET:
VIR_FREE(data->net.ifname);
VIR_FREE(data->net.address);
+ VIR_FREE(data->net.features);
break;
case VIR_NODE_DEV_CAP_SCSI_HOST:
VIR_FREE(data->scsi_host.wwnn);
diff --git a/src/conf/node_device_conf.h b/src/conf/node_device_conf.h
index fd5d179..918523a 100644
--- a/src/conf/node_device_conf.h
+++ b/src/conf/node_device_conf.h
@@ -141,6 +141,8 @@ struct _virNodeDevCapsDef {
char *ifname;
virInterfaceLink lnk;
virNodeDevNetCapType subtype; /* LAST -> no subtype */
+ size_t nfeatures;
+ virDevFeaturePtr features;
} net;
struct {
unsigned int host;
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index c07a561..1d165a9 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -1659,6 +1659,7 @@ virNetDevAddRoute;
virNetDevClearIPAddress;
virNetDevDelMulti;
virNetDevExists;
+virNetDevGetFeatures;
virNetDevGetIndex;
virNetDevGetIPv4Address;
virNetDevGetLinkInfo;
diff --git a/src/node_device/node_device_udev.c b/src/node_device/node_device_udev.c
index 03c7a0b..349733f 100644
--- a/src/node_device/node_device_udev.c
+++ b/src/node_device/node_device_udev.c
@@ -719,6 +719,10 @@ static int udevProcessNetworkInterface(struct udev_device *device,
if (virNetDevGetLinkInfo(data->net.ifname, &data->net.lnk) < 0)
goto out;
+ if (virNetDevGetFeatures(data->net.ifname, &data->net.features,
+ &data->net.nfeatures) < 0)
+ goto out;
+
ret = 0;
out:
diff --git a/src/util/virnetdev.c b/src/util/virnetdev.c
index 2a0eb43..e513c85 100644
--- a/src/util/virnetdev.c
+++ b/src/util/virnetdev.c
@@ -2728,3 +2728,137 @@ int virNetDevGetRxFilter(const char *ifname,
*filter = fil;
return ret;
}
+
+#if defined(SIOCETHTOOL) && defined(HAVE_STRUCT_IFREQ)
+
+/**
+ * _virNetDevFeatureAvailable
+ * This function checks for the availability of a network device feature
+ *
+ * @ifname: name of the interface
+ * @cmd: reference to an ethtool command structure
+ *
+ * Returns 0 on success, -1 on failure.
+ */
+int
+_virNetDevFeatureAvailable(const char *ifname, struct ethtool_value *cmd)
+{
+ int ret = -1;
+ int sock = -1;
+ virIfreq ifr;
+
+ sock = socket(AF_LOCAL, SOCK_DGRAM, 0);
+ if (sock < 0) {
+ virReportSystemError(errno, "%s", _("Cannot open control socket"));
+ goto cleanup;
+ }
+
+ strcpy(ifr.ifr_name, ifname);
+ ifr.ifr_data = (void*) cmd;
+
+ if (ioctl(sock, SIOCETHTOOL, &ifr) != 0) {
+ /* Privileged command, no error */
+ if (errno == EPERM || errno == EINVAL) {
+ virReportSystemError(errno, "%s", _("ioctl"));
+ /* Some kernels dont support named feature, no error */
+ } else if (errno == EOPNOTSUPP) {
+ virReportSystemError(errno, "%s", _("Warning"));
+ } else {
+ virReportSystemError(errno, "%s", _("Error"));
+ goto cleanup;
+ }
+ }
+
+ ret = cmd->data > 0 ? 1: 0;
+ cleanup:
+ if (sock)
+ VIR_FORCE_CLOSE(sock);
+
+ return ret;
+}
+
+
+/**
+ * virNetDevGetFeatures:
+ * This function gets the nic offloads features available for ifname
+ *
+ * @ifname: name of the interface
+ * @features: network device feature structures
+ * @nfeatures: number of features available
+ *
+ * Returns 0 on success, -1 on failure.
+ */
+int
+virNetDevGetFeatures(const char *ifname,
+ virDevFeaturePtr *features,
+ size_t *nfeatures)
+{
+ int ret = -1;
+ size_t i = -1;
+ size_t j = -1;
+ struct ethtool_value cmd;
+
+ struct elem{
+ const char *name;
+ const int cmd;
+ };
+ /* legacy ethtool getters */
+ struct elem cmds[] = {
+ {"rx", ETHTOOL_GRXCSUM},
+ {"tx", ETHTOOL_GTXCSUM },
+ {"sg", ETHTOOL_GSG},
+ {"tso", ETHTOOL_GTSO},
+ {"gso", ETHTOOL_GGSO},
+ {"gro", ETHTOOL_GGRO},
+ };
+ /* ethtool masks */
+ struct elem flags[] = {
+ {"lro", ETH_FLAG_LRO},
+ {"rxvlan", ETH_FLAG_RXVLAN},
+ {"txvlan", ETH_FLAG_TXVLAN},
+ {"ntuple", ETH_FLAG_NTUPLE},
+ {"rxhash", ETH_FLAG_RXHASH},
+ };
+
+ for (i = 0; i < (sizeof(cmds)/sizeof(struct elem)); i++) {
+ cmd.cmd = cmds[i].cmd;
+ if (_virNetDevFeatureAvailable(ifname, &cmd)) {
+ if (VIR_EXPAND_N(*features, *nfeatures, 1) < 0)
+ goto cleanup;
+ if ((ret = VIR_STRDUP((*features)[i].name, cmds[i].name)) != 1)
+ goto cleanup;
+ }
+ }
+
+ cmd.cmd = ETHTOOL_GFLAGS;
+ for (j = 0; j < (sizeof(flags)/sizeof(struct elem)); j++) {
+ if (_virNetDevFeatureAvailable(ifname, &cmd)) {
+ if (cmd.data & (flags[j].cmd)) {
+ if (VIR_EXPAND_N(*features, *nfeatures, 1) < 0)
+ goto cleanup;
+ if ((ret = VIR_STRDUP((*features)[i++].name, flags[j].name)) != 1)
+ goto cleanup;
+ }
+ }
+ }
+
+ ret = 0;
+ cleanup:
+
+ return ret;
+
+}
+#else
+int
+virNetDevGetFeatures(const char *ifname,
+ virDevFeaturePtr *features,
+ size_t *nfeatures)
+{
+ VIR_DEBUG("Getting network device features on %s is not implemented on this platform",
+ ifname);
+ *features = NULL;
+ *nfeatures = 0;
+
+ return 0;
+}
+#endif
diff --git a/src/util/virnetdev.h b/src/util/virnetdev.h
index de8b480..3847c68 100644
--- a/src/util/virnetdev.h
+++ b/src/util/virnetdev.h
@@ -31,6 +31,8 @@
# include "virpci.h"
# include "device_conf.h"
+# include <linux/ethtool.h>
+typedef struct ethtool_cmd virEthCmd;
# ifdef HAVE_STRUCT_IFREQ
typedef struct ifreq virIfreq;
# else
@@ -182,9 +184,17 @@ int virNetDevGetVirtualFunctionInfo(const char *vfname, char **pfname,
int *vf)
ATTRIBUTE_NONNULL(1);
+int virNetDevGetFeatures(const char *ifname,
+ virDevFeaturePtr *features,
+ size_t *nfeatures)
+ ATTRIBUTE_NONNULL(1);
+
+int _virNetDevFeatureAvailable(const char *ifname, struct ethtool_value *cmd)
+ ATTRIBUTE_NONNULL(1) ATTRIBUTE_RETURN_CHECK;
+
int virNetDevGetLinkInfo(const char *ifname,
virInterfaceLinkPtr lnk)
- ATTRIBUTE_NONNULL(1);
+ ATTRIBUTE_NONNULL(1) ATTRIBUTE_RETURN_CHECK;
virNetDevRxFilterPtr virNetDevRxFilterNew(void)
ATTRIBUTE_RETURN_CHECK;
--
2.1.0
--
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