*/
static void qemu_rdma_dump_id(const char *who, struct ibv_context *verbs)
{
+ struct ibv_port_attr port;
+
+ if (ibv_query_port(verbs, 1, &port)) {
+ fprintf(stderr, "FAILED TO QUERY PORT INFORMATION!\n");
+ return;
+ }
+
printf("%s RDMA Device opened: kernel name %s "
"uverbs device name %s, "
- "infiniband_verbs class device path %s,"
- " infiniband class device path %s\n",
+ "infiniband_verbs class device path %s, "
+ "infiniband class device path %s, "
+ "transport: (%d) %s\n",
who,
verbs->device->name,
verbs->device->dev_name,
verbs->device->dev_path,
- verbs->device->ibdev_path);
+ verbs->device->ibdev_path,
+ port.link_layer,
+ (port.link_layer == IBV_LINK_LAYER_INFINIBAND) ? "Infiniband" :
+ ((port.link_layer == IBV_LINK_LAYER_ETHERNET)
+ ? "Ethernet" : "Unknown"));
}
/*
DPRINTF("%s Source GID: %s, Dest GID: %s\n", who, sgid, dgid);
}
+/*
+ * As of now, IPv6 over RoCE / iWARP is not supported by linux.
+ * We will try the next addrinfo struct, and fail if there are
+ * no other valid addresses to bind against.
+ *
+ * If user is listening on '[::]', then we will not have a opened a device
+ * yet and have no way of verifying if the device is RoCE or not.
+ *
+ * In this case, the source VM will throw an error for ALL types of
+ * connections (both IPv4 and IPv6) if the destination machine does not have
+ * a regular infiniband network available for use.
+ *
+ * The only way to gaurantee that an error is thrown for broken kernels is
+ * for the management software to choose a *specific* interface at bind time
+ * and validate what time of hardware it is.
+ *
+ * Unfortunately, this puts the user in a fix:
+ *
+ * If the source VM connects with an IPv4 address without knowing that the
+ * destination has bound to '[::]' the migration will unconditionally fail
+ * unless the management software is explicitly listening on the the IPv4
+ * address while using a RoCE-based device.
+ *
+ * If the source VM connects with an IPv6 address, then we're OK because we can
+ * throw an error on the source (and similarly on the destination).
+ *
+ * But in mixed environments, this will be broken for a while until it is fixed
+ * inside linux.
+ *
+ * We do provide a *tiny* bit of help in this function: We can list all of the
+ * devices in the system and check to see if all the devices are RoCE or
+ * Infiniband.
+ *
+ * If we detect that we have a *pure* RoCE environment, then we can safely
+ * thrown an error even if the management sofware has specified '[::]' as the
+ * bind address.
+ *
+ * However, if there is are multiple hetergeneous devices, then we cannot make
+ * this assumption and the user just has to be sure they know what they are
+ * doing.
+ *
+ * Patches are being reviewed on linux-rdma.
+ */
+static int qemu_rdma_broken_ipv6_kernel(Error **errp, struct ibv_context *verbs)
+{
+ struct ibv_port_attr port_attr;
+
+ /* This bug only exists in linux, to our knowledge. */
+#ifdef CONFIG_LINUX
+
+ /*
+ * Verbs are only NULL if management has bound to '[::]'.
+ *
+ * Let's iterate through all the devices and see if there any pure IB
+ * devices (non-ethernet).
+ *
+ * If not, then we can safely proceed with the migration.
+ * Otherwise, there are no gaurantees until the bug is fixed in linux.
+ */
+ if (!verbs) {
+ int num_devices, x;
+ struct ibv_device ** dev_list = ibv_get_device_list(&num_devices);
+ bool roce_found = false;
+ bool ib_found = false;
+
+ for (x = 0; x < num_devices; x++) {
+ verbs = ibv_open_device(dev_list[x]);
+
+ if (ibv_query_port(verbs, 1, &port_attr)) {
+ ibv_close_device(verbs);
+ ERROR(errp, "Could not query initial IB port");
+ return -EINVAL;
+ }
+
+ if (port_attr.link_layer == IBV_LINK_LAYER_INFINIBAND) {
+ ib_found = true;
+ } else if (port_attr.link_layer == IBV_LINK_LAYER_ETHERNET) {
+ roce_found = true;
+ }
+
+ ibv_close_device(verbs);
+
+ }
+
+ if (roce_found) {
+ if (ib_found) {
+ fprintf(stderr, "WARN: migrations may fail:"
+ " IPv6 over RoCE / iWARP in linux"
+ " is broken. But since you appear to have a"
+ " mixed RoCE / IB environment, be sure to only"
+ " migrate over the IB fabric until the kernel "
+ " fixes the bug.\n");
+ } else {
+ ERROR(errp, "You only have RoCE / iWARP devices in your systems"
+ " and your management software has specified '[::]'"
+ ", but IPv6 over RoCE / iWARP is not supported in Linux.");
+ return -ENONET;
+ }
+ }
+
+ return 0;
+ }
+
+ /*
+ * If we have a verbs context, that means that some other than '[::]' was
+ * used by the management software for binding. In which case we can actually
+ * warn the user about a potential broken kernel;
+ */
+
+ /* IB ports start with 1, not 0 */
+ if (ibv_query_port(verbs, 1, &port_attr)) {
+ ERROR(errp, "Could not query initial IB port");
+ return -EINVAL;
+ }
+
+ if (port_attr.link_layer == IBV_LINK_LAYER_ETHERNET) {
+ ERROR(errp, "Linux kernel's RoCE / iWARP does not support IPv6 "
+ "(but patches on linux-rdma in progress)");
+ return -ENONET;
+ }
+
+#endif
+
+ return 0;
+}
+
/*
* Figure out which RDMA device corresponds to the requested IP hostname
* Also create the initial connection manager identifiers for opening
static int qemu_rdma_resolve_host(RDMAContext *rdma, Error **errp)
{
int ret;
- struct addrinfo *res;
+ struct rdma_addrinfo *res;
char port_str[16];
struct rdma_cm_event *cm_event;
char ip[40] = "unknown";
- struct addrinfo *e;
+ struct rdma_addrinfo *e;
if (rdma->host == NULL || !strcmp(rdma->host, "")) {
ERROR(errp, "RDMA hostname has not been set");
- return -1;
+ return -EINVAL;
}
/* create CM channel */
rdma->channel = rdma_create_event_channel();
if (!rdma->channel) {
ERROR(errp, "could not create CM channel");
- return -1;
+ return -EINVAL;
}
/* create CM id */
snprintf(port_str, 16, "%d", rdma->port);
port_str[15] = '\0';
- ret = getaddrinfo(rdma->host, port_str, NULL, &res);
+ ret = rdma_getaddrinfo(rdma->host, port_str, NULL, &res);
if (ret < 0) {
- ERROR(errp, "could not getaddrinfo address %s", rdma->host);
+ ERROR(errp, "could not rdma_getaddrinfo address %s", rdma->host);
goto err_resolve_get_addr;
}
for (e = res; e != NULL; e = e->ai_next) {
inet_ntop(e->ai_family,
- &((struct sockaddr_in *) e->ai_addr)->sin_addr, ip, sizeof ip);
+ &((struct sockaddr_in *) e->ai_dst_addr)->sin_addr, ip, sizeof ip);
DPRINTF("Trying %s => %s\n", rdma->host, ip);
- /* resolve the first address */
- ret = rdma_resolve_addr(rdma->cm_id, NULL, e->ai_addr,
+ ret = rdma_resolve_addr(rdma->cm_id, NULL, e->ai_dst_addr,
RDMA_RESOLVE_TIMEOUT_MS);
if (!ret) {
+ ret = qemu_rdma_broken_ipv6_kernel(errp, rdma->cm_id->verbs);
+ if (ret) {
+ continue;
+ }
goto route;
}
}
ERROR(errp, "result not equal to event_addr_resolved %s",
rdma_event_str(cm_event->event));
perror("rdma_resolve_addr");
+ ret = -EINVAL;
goto err_resolve_get_addr;
}
rdma_ack_cm_event(cm_event);
ERROR(errp, "result not equal to event_route_resolved: %s",
rdma_event_str(cm_event->event));
rdma_ack_cm_event(cm_event);
+ ret = -EINVAL;
goto err_resolve_get_addr;
}
rdma_ack_cm_event(cm_event);
err_resolve_create_id:
rdma_destroy_event_channel(rdma->channel);
rdma->channel = NULL;
-
- return -1;
+ return ret;
}
/*
int ret = -EINVAL, idx;
struct rdma_cm_id *listen_id;
char ip[40] = "unknown";
- struct addrinfo *res;
+ struct rdma_addrinfo *res;
char port_str[16];
for (idx = 0; idx < RDMA_WRID_MAX; idx++) {
port_str[15] = '\0';
if (rdma->host && strcmp("", rdma->host)) {
- struct addrinfo *e;
+ struct rdma_addrinfo *e;
- ret = getaddrinfo(rdma->host, port_str, NULL, &res);
+ ret = rdma_getaddrinfo(rdma->host, port_str, NULL, &res);
if (ret < 0) {
- ERROR(errp, "could not getaddrinfo address %s", rdma->host);
+ ERROR(errp, "could not rdma_getaddrinfo address %s", rdma->host);
goto err_dest_init_bind_addr;
}
for (e = res; e != NULL; e = e->ai_next) {
inet_ntop(e->ai_family,
- &((struct sockaddr_in *) e->ai_addr)->sin_addr, ip, sizeof ip);
+ &((struct sockaddr_in *) e->ai_dst_addr)->sin_addr, ip, sizeof ip);
DPRINTF("Trying %s => %s\n", rdma->host, ip);
- ret = rdma_bind_addr(listen_id, e->ai_addr);
+ ret = rdma_bind_addr(listen_id, e->ai_dst_addr);
if (!ret) {
+ if (e->ai_family == AF_INET6) {
+ ret = qemu_rdma_broken_ipv6_kernel(errp, listen_id->verbs);
+ if (ret) {
+ continue;
+ }
+ }
+
goto listen;
}
}
projects / qemu.git / blobdiff