RDMA/cm: Add RDMA CM support for IBoE devices
Add support for IBoE device binding and IP --> GID resolution. Path
resolving and multicast joining are implemented within cma.c by
filling in the responses and running callbacks in the CMA work queue.
IP --> GID resolution always yields IPv6 link local addresses; remote
GIDs are derived from the destination MAC address of the remote port.
Multicast GIDs are always mapped to multicast MACs as is done in IPv6.
(IPv4 multicast is enabled by translating IPv4 multicast addresses to
IPv6 multicast as described in
<http://www.mail-archive.com/ipng@sunroof.eng.sun.com/msg02134.html>.)
Some helper functions are added to ib_addr.h.
Signed-off-by: Eli Cohen <eli@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c
index b930b81..f61bc07 100644
--- a/drivers/infiniband/core/cma.c
+++ b/drivers/infiniband/core/cma.c
@@ -59,6 +59,7 @@
#define CMA_CM_RESPONSE_TIMEOUT 20
#define CMA_MAX_CM_RETRIES 15
#define CMA_CM_MRA_SETTING (IB_CM_MRA_FLAG_DELAY | 24)
+#define CMA_IBOE_PACKET_LIFETIME 18
static void cma_add_one(struct ib_device *device);
static void cma_remove_one(struct ib_device *device);
@@ -157,6 +158,7 @@
struct list_head list;
void *context;
struct sockaddr_storage addr;
+ struct kref mcref;
};
struct cma_work {
@@ -173,6 +175,12 @@
struct rdma_cm_event event;
};
+struct iboe_mcast_work {
+ struct work_struct work;
+ struct rdma_id_private *id;
+ struct cma_multicast *mc;
+};
+
union cma_ip_addr {
struct in6_addr ip6;
struct {
@@ -281,6 +289,8 @@
atomic_inc(&cma_dev->refcount);
id_priv->cma_dev = cma_dev;
id_priv->id.device = cma_dev->device;
+ id_priv->id.route.addr.dev_addr.transport =
+ rdma_node_get_transport(cma_dev->device->node_type);
list_add_tail(&id_priv->list, &cma_dev->id_list);
}
@@ -290,6 +300,14 @@
complete(&cma_dev->comp);
}
+static inline void release_mc(struct kref *kref)
+{
+ struct cma_multicast *mc = container_of(kref, struct cma_multicast, mcref);
+
+ kfree(mc->multicast.ib);
+ kfree(mc);
+}
+
static void cma_detach_from_dev(struct rdma_id_private *id_priv)
{
list_del(&id_priv->list);
@@ -323,22 +341,63 @@
return ret;
}
+static int find_gid_port(struct ib_device *device, union ib_gid *gid, u8 port_num)
+{
+ int i;
+ int err;
+ struct ib_port_attr props;
+ union ib_gid tmp;
+
+ err = ib_query_port(device, port_num, &props);
+ if (err)
+ return 1;
+
+ for (i = 0; i < props.gid_tbl_len; ++i) {
+ err = ib_query_gid(device, port_num, i, &tmp);
+ if (err)
+ return 1;
+ if (!memcmp(&tmp, gid, sizeof tmp))
+ return 0;
+ }
+
+ return -EAGAIN;
+}
+
static int cma_acquire_dev(struct rdma_id_private *id_priv)
{
struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
struct cma_device *cma_dev;
- union ib_gid gid;
+ union ib_gid gid, iboe_gid;
int ret = -ENODEV;
+ u8 port;
+ enum rdma_link_layer dev_ll = dev_addr->dev_type == ARPHRD_INFINIBAND ?
+ IB_LINK_LAYER_INFINIBAND : IB_LINK_LAYER_ETHERNET;
- rdma_addr_get_sgid(dev_addr, &gid);
+ iboe_addr_get_sgid(dev_addr, &iboe_gid);
+ memcpy(&gid, dev_addr->src_dev_addr +
+ rdma_addr_gid_offset(dev_addr), sizeof gid);
list_for_each_entry(cma_dev, &dev_list, list) {
- ret = ib_find_cached_gid(cma_dev->device, &gid,
- &id_priv->id.port_num, NULL);
- if (!ret) {
- cma_attach_to_dev(id_priv, cma_dev);
- break;
+ for (port = 1; port <= cma_dev->device->phys_port_cnt; ++port) {
+ if (rdma_port_get_link_layer(cma_dev->device, port) == dev_ll) {
+ if (rdma_node_get_transport(cma_dev->device->node_type) == RDMA_TRANSPORT_IB &&
+ rdma_port_get_link_layer(cma_dev->device, port) == IB_LINK_LAYER_ETHERNET)
+ ret = find_gid_port(cma_dev->device, &iboe_gid, port);
+ else
+ ret = find_gid_port(cma_dev->device, &gid, port);
+
+ if (!ret) {
+ id_priv->id.port_num = port;
+ goto out;
+ } else if (ret == 1)
+ break;
+ }
}
}
+
+out:
+ if (!ret)
+ cma_attach_to_dev(id_priv, cma_dev);
+
return ret;
}
@@ -556,10 +615,16 @@
{
struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
int ret;
+ u16 pkey;
+
+ if (rdma_port_get_link_layer(id_priv->id.device, id_priv->id.port_num) ==
+ IB_LINK_LAYER_INFINIBAND)
+ pkey = ib_addr_get_pkey(dev_addr);
+ else
+ pkey = 0xffff;
ret = ib_find_cached_pkey(id_priv->id.device, id_priv->id.port_num,
- ib_addr_get_pkey(dev_addr),
- &qp_attr->pkey_index);
+ pkey, &qp_attr->pkey_index);
if (ret)
return ret;
@@ -737,8 +802,8 @@
static void cma_cancel_route(struct rdma_id_private *id_priv)
{
- switch (rdma_node_get_transport(id_priv->id.device->node_type)) {
- case RDMA_TRANSPORT_IB:
+ switch (rdma_port_get_link_layer(id_priv->id.device, id_priv->id.port_num)) {
+ case IB_LINK_LAYER_INFINIBAND:
if (id_priv->query)
ib_sa_cancel_query(id_priv->query_id, id_priv->query);
break;
@@ -816,8 +881,17 @@
mc = container_of(id_priv->mc_list.next,
struct cma_multicast, list);
list_del(&mc->list);
- ib_sa_free_multicast(mc->multicast.ib);
- kfree(mc);
+ switch (rdma_port_get_link_layer(id_priv->cma_dev->device, id_priv->id.port_num)) {
+ case IB_LINK_LAYER_INFINIBAND:
+ ib_sa_free_multicast(mc->multicast.ib);
+ kfree(mc);
+ break;
+ case IB_LINK_LAYER_ETHERNET:
+ kref_put(&mc->mcref, release_mc);
+ break;
+ default:
+ break;
+ }
}
}
@@ -833,7 +907,7 @@
mutex_lock(&lock);
if (id_priv->cma_dev) {
mutex_unlock(&lock);
- switch (rdma_node_get_transport(id->device->node_type)) {
+ switch (rdma_node_get_transport(id_priv->id.device->node_type)) {
case RDMA_TRANSPORT_IB:
if (id_priv->cm_id.ib && !IS_ERR(id_priv->cm_id.ib))
ib_destroy_cm_id(id_priv->cm_id.ib);
@@ -1708,6 +1782,77 @@
return 0;
}
+static int cma_resolve_iboe_route(struct rdma_id_private *id_priv)
+{
+ struct rdma_route *route = &id_priv->id.route;
+ struct rdma_addr *addr = &route->addr;
+ struct cma_work *work;
+ int ret;
+ struct sockaddr_in *src_addr = (struct sockaddr_in *)&route->addr.src_addr;
+ struct sockaddr_in *dst_addr = (struct sockaddr_in *)&route->addr.dst_addr;
+ struct net_device *ndev = NULL;
+
+ if (src_addr->sin_family != dst_addr->sin_family)
+ return -EINVAL;
+
+ work = kzalloc(sizeof *work, GFP_KERNEL);
+ if (!work)
+ return -ENOMEM;
+
+ work->id = id_priv;
+ INIT_WORK(&work->work, cma_work_handler);
+
+ route->path_rec = kzalloc(sizeof *route->path_rec, GFP_KERNEL);
+ if (!route->path_rec) {
+ ret = -ENOMEM;
+ goto err1;
+ }
+
+ route->num_paths = 1;
+
+ iboe_mac_to_ll(&route->path_rec->sgid, addr->dev_addr.src_dev_addr);
+ iboe_mac_to_ll(&route->path_rec->dgid, addr->dev_addr.dst_dev_addr);
+
+ route->path_rec->hop_limit = 1;
+ route->path_rec->reversible = 1;
+ route->path_rec->pkey = cpu_to_be16(0xffff);
+ route->path_rec->mtu_selector = IB_SA_EQ;
+
+ if (addr->dev_addr.bound_dev_if)
+ ndev = dev_get_by_index(&init_net, addr->dev_addr.bound_dev_if);
+ if (!ndev) {
+ ret = -ENODEV;
+ goto err2;
+ }
+
+ route->path_rec->mtu = iboe_get_mtu(ndev->mtu);
+ route->path_rec->rate_selector = IB_SA_EQ;
+ route->path_rec->rate = iboe_get_rate(ndev);
+ dev_put(ndev);
+ route->path_rec->packet_life_time_selector = IB_SA_EQ;
+ route->path_rec->packet_life_time = CMA_IBOE_PACKET_LIFETIME;
+ if (!route->path_rec->mtu) {
+ ret = -EINVAL;
+ goto err2;
+ }
+
+ work->old_state = CMA_ROUTE_QUERY;
+ work->new_state = CMA_ROUTE_RESOLVED;
+ work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
+ work->event.status = 0;
+
+ queue_work(cma_wq, &work->work);
+
+ return 0;
+
+err2:
+ kfree(route->path_rec);
+ route->path_rec = NULL;
+err1:
+ kfree(work);
+ return ret;
+}
+
int rdma_resolve_route(struct rdma_cm_id *id, int timeout_ms)
{
struct rdma_id_private *id_priv;
@@ -1720,7 +1865,16 @@
atomic_inc(&id_priv->refcount);
switch (rdma_node_get_transport(id->device->node_type)) {
case RDMA_TRANSPORT_IB:
- ret = cma_resolve_ib_route(id_priv, timeout_ms);
+ switch (rdma_port_get_link_layer(id->device, id->port_num)) {
+ case IB_LINK_LAYER_INFINIBAND:
+ ret = cma_resolve_ib_route(id_priv, timeout_ms);
+ break;
+ case IB_LINK_LAYER_ETHERNET:
+ ret = cma_resolve_iboe_route(id_priv);
+ break;
+ default:
+ ret = -ENOSYS;
+ }
break;
case RDMA_TRANSPORT_IWARP:
ret = cma_resolve_iw_route(id_priv, timeout_ms);
@@ -1773,7 +1927,7 @@
goto out;
id_priv->id.route.addr.dev_addr.dev_type =
- (rdma_node_get_transport(cma_dev->device->node_type) == RDMA_TRANSPORT_IB) ?
+ (rdma_port_get_link_layer(cma_dev->device, p) == IB_LINK_LAYER_INFINIBAND) ?
ARPHRD_INFINIBAND : ARPHRD_ETHER;
rdma_addr_set_sgid(&id_priv->id.route.addr.dev_addr, &gid);
@@ -2758,6 +2912,102 @@
return 0;
}
+static void iboe_mcast_work_handler(struct work_struct *work)
+{
+ struct iboe_mcast_work *mw = container_of(work, struct iboe_mcast_work, work);
+ struct cma_multicast *mc = mw->mc;
+ struct ib_sa_multicast *m = mc->multicast.ib;
+
+ mc->multicast.ib->context = mc;
+ cma_ib_mc_handler(0, m);
+ kref_put(&mc->mcref, release_mc);
+ kfree(mw);
+}
+
+static void cma_iboe_set_mgid(struct sockaddr *addr, union ib_gid *mgid)
+{
+ struct sockaddr_in *sin = (struct sockaddr_in *)addr;
+ struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)addr;
+
+ if (cma_any_addr(addr)) {
+ memset(mgid, 0, sizeof *mgid);
+ } else if (addr->sa_family == AF_INET6) {
+ memcpy(mgid, &sin6->sin6_addr, sizeof *mgid);
+ } else {
+ mgid->raw[0] = 0xff;
+ mgid->raw[1] = 0x0e;
+ mgid->raw[2] = 0;
+ mgid->raw[3] = 0;
+ mgid->raw[4] = 0;
+ mgid->raw[5] = 0;
+ mgid->raw[6] = 0;
+ mgid->raw[7] = 0;
+ mgid->raw[8] = 0;
+ mgid->raw[9] = 0;
+ mgid->raw[10] = 0xff;
+ mgid->raw[11] = 0xff;
+ *(__be32 *)(&mgid->raw[12]) = sin->sin_addr.s_addr;
+ }
+}
+
+static int cma_iboe_join_multicast(struct rdma_id_private *id_priv,
+ struct cma_multicast *mc)
+{
+ struct iboe_mcast_work *work;
+ struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr;
+ int err;
+ struct sockaddr *addr = (struct sockaddr *)&mc->addr;
+ struct net_device *ndev = NULL;
+
+ if (cma_zero_addr((struct sockaddr *)&mc->addr))
+ return -EINVAL;
+
+ work = kzalloc(sizeof *work, GFP_KERNEL);
+ if (!work)
+ return -ENOMEM;
+
+ mc->multicast.ib = kzalloc(sizeof(struct ib_sa_multicast), GFP_KERNEL);
+ if (!mc->multicast.ib) {
+ err = -ENOMEM;
+ goto out1;
+ }
+
+ cma_iboe_set_mgid(addr, &mc->multicast.ib->rec.mgid);
+
+ mc->multicast.ib->rec.pkey = cpu_to_be16(0xffff);
+ if (id_priv->id.ps == RDMA_PS_UDP)
+ mc->multicast.ib->rec.qkey = cpu_to_be32(RDMA_UDP_QKEY);
+
+ if (dev_addr->bound_dev_if)
+ ndev = dev_get_by_index(&init_net, dev_addr->bound_dev_if);
+ if (!ndev) {
+ err = -ENODEV;
+ goto out2;
+ }
+ mc->multicast.ib->rec.rate = iboe_get_rate(ndev);
+ mc->multicast.ib->rec.hop_limit = 1;
+ mc->multicast.ib->rec.mtu = iboe_get_mtu(ndev->mtu);
+ dev_put(ndev);
+ if (!mc->multicast.ib->rec.mtu) {
+ err = -EINVAL;
+ goto out2;
+ }
+ iboe_addr_get_sgid(dev_addr, &mc->multicast.ib->rec.port_gid);
+ work->id = id_priv;
+ work->mc = mc;
+ INIT_WORK(&work->work, iboe_mcast_work_handler);
+ kref_get(&mc->mcref);
+ queue_work(cma_wq, &work->work);
+
+ return 0;
+
+out2:
+ kfree(mc->multicast.ib);
+out1:
+ kfree(work);
+ return err;
+}
+
int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr,
void *context)
{
@@ -2784,7 +3034,17 @@
switch (rdma_node_get_transport(id->device->node_type)) {
case RDMA_TRANSPORT_IB:
- ret = cma_join_ib_multicast(id_priv, mc);
+ switch (rdma_port_get_link_layer(id->device, id->port_num)) {
+ case IB_LINK_LAYER_INFINIBAND:
+ ret = cma_join_ib_multicast(id_priv, mc);
+ break;
+ case IB_LINK_LAYER_ETHERNET:
+ kref_init(&mc->mcref);
+ ret = cma_iboe_join_multicast(id_priv, mc);
+ break;
+ default:
+ ret = -EINVAL;
+ }
break;
default:
ret = -ENOSYS;
@@ -2817,8 +3077,19 @@
ib_detach_mcast(id->qp,
&mc->multicast.ib->rec.mgid,
mc->multicast.ib->rec.mlid);
- ib_sa_free_multicast(mc->multicast.ib);
- kfree(mc);
+ if (rdma_node_get_transport(id_priv->cma_dev->device->node_type) == RDMA_TRANSPORT_IB) {
+ switch (rdma_port_get_link_layer(id->device, id->port_num)) {
+ case IB_LINK_LAYER_INFINIBAND:
+ ib_sa_free_multicast(mc->multicast.ib);
+ kfree(mc);
+ break;
+ case IB_LINK_LAYER_ETHERNET:
+ kref_put(&mc->mcref, release_mc);
+ break;
+ default:
+ break;
+ }
+ }
return;
}
}
diff --git a/drivers/infiniband/core/sa_query.c b/drivers/infiniband/core/sa_query.c
index 27674c7..91a6603 100644
--- a/drivers/infiniband/core/sa_query.c
+++ b/drivers/infiniband/core/sa_query.c
@@ -496,6 +496,7 @@
{
int ret;
u16 gid_index;
+ int force_grh;
memset(ah_attr, 0, sizeof *ah_attr);
ah_attr->dlid = be16_to_cpu(rec->dlid);
@@ -505,7 +506,9 @@
ah_attr->port_num = port_num;
ah_attr->static_rate = rec->rate;
- if (rec->hop_limit > 1) {
+ force_grh = rdma_port_get_link_layer(device, port_num) == IB_LINK_LAYER_ETHERNET;
+
+ if (rec->hop_limit > 1 || force_grh) {
ah_attr->ah_flags = IB_AH_GRH;
ah_attr->grh.dgid = rec->dgid;
diff --git a/drivers/infiniband/core/ucma.c b/drivers/infiniband/core/ucma.c
index ac7edc2..3d3c926 100644
--- a/drivers/infiniband/core/ucma.c
+++ b/drivers/infiniband/core/ucma.c
@@ -583,6 +583,34 @@
}
}
+static void ucma_copy_iboe_route(struct rdma_ucm_query_route_resp *resp,
+ struct rdma_route *route)
+{
+ struct rdma_dev_addr *dev_addr;
+
+ resp->num_paths = route->num_paths;
+ switch (route->num_paths) {
+ case 0:
+ dev_addr = &route->addr.dev_addr;
+ iboe_mac_to_ll((union ib_gid *) &resp->ib_route[0].dgid,
+ dev_addr->dst_dev_addr);
+ iboe_addr_get_sgid(dev_addr,
+ (union ib_gid *) &resp->ib_route[0].sgid);
+ resp->ib_route[0].pkey = cpu_to_be16(0xffff);
+ break;
+ case 2:
+ ib_copy_path_rec_to_user(&resp->ib_route[1],
+ &route->path_rec[1]);
+ /* fall through */
+ case 1:
+ ib_copy_path_rec_to_user(&resp->ib_route[0],
+ &route->path_rec[0]);
+ break;
+ default:
+ break;
+ }
+}
+
static ssize_t ucma_query_route(struct ucma_file *file,
const char __user *inbuf,
int in_len, int out_len)
@@ -617,12 +645,17 @@
resp.node_guid = (__force __u64) ctx->cm_id->device->node_guid;
resp.port_num = ctx->cm_id->port_num;
- switch (rdma_node_get_transport(ctx->cm_id->device->node_type)) {
- case RDMA_TRANSPORT_IB:
- ucma_copy_ib_route(&resp, &ctx->cm_id->route);
- break;
- default:
- break;
+ if (rdma_node_get_transport(ctx->cm_id->device->node_type) == RDMA_TRANSPORT_IB) {
+ switch (rdma_port_get_link_layer(ctx->cm_id->device, ctx->cm_id->port_num)) {
+ case IB_LINK_LAYER_INFINIBAND:
+ ucma_copy_ib_route(&resp, &ctx->cm_id->route);
+ break;
+ case IB_LINK_LAYER_ETHERNET:
+ ucma_copy_iboe_route(&resp, &ctx->cm_id->route);
+ break;
+ default:
+ break;
+ }
}
out:
diff --git a/include/rdma/ib_addr.h b/include/rdma/ib_addr.h
index fa0d52b..904ffa9 100644
--- a/include/rdma/ib_addr.h
+++ b/include/rdma/ib_addr.h
@@ -40,6 +40,7 @@
#include <linux/netdevice.h>
#include <linux/socket.h>
#include <rdma/ib_verbs.h>
+#include <rdma/ib_pack.h>
struct rdma_addr_client {
atomic_t refcount;
@@ -63,6 +64,7 @@
unsigned char broadcast[MAX_ADDR_LEN];
unsigned short dev_type;
int bound_dev_if;
+ enum rdma_transport_type transport;
};
/**
@@ -127,9 +129,31 @@
return dev_addr->dev_type == ARPHRD_INFINIBAND ? 4 : 0;
}
+static inline void iboe_mac_to_ll(union ib_gid *gid, u8 *mac)
+{
+ memset(gid->raw, 0, 16);
+ *((__be32 *) gid->raw) = cpu_to_be32(0xfe800000);
+ gid->raw[12] = 0xfe;
+ gid->raw[11] = 0xff;
+ memcpy(gid->raw + 13, mac + 3, 3);
+ memcpy(gid->raw + 8, mac, 3);
+ gid->raw[8] ^= 2;
+}
+
+static inline void iboe_addr_get_sgid(struct rdma_dev_addr *dev_addr,
+ union ib_gid *gid)
+{
+ iboe_mac_to_ll(gid, dev_addr->src_dev_addr);
+}
+
static inline void rdma_addr_get_sgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid)
{
- memcpy(gid, dev_addr->src_dev_addr + rdma_addr_gid_offset(dev_addr), sizeof *gid);
+ if (dev_addr->transport == RDMA_TRANSPORT_IB &&
+ dev_addr->dev_type != ARPHRD_INFINIBAND)
+ iboe_addr_get_sgid(dev_addr, gid);
+ else
+ memcpy(gid, dev_addr->src_dev_addr +
+ rdma_addr_gid_offset(dev_addr), sizeof *gid);
}
static inline void rdma_addr_set_sgid(struct rdma_dev_addr *dev_addr, union ib_gid *gid)
@@ -147,4 +171,77 @@
memcpy(dev_addr->dst_dev_addr + rdma_addr_gid_offset(dev_addr), gid, sizeof *gid);
}
+static inline enum ib_mtu iboe_get_mtu(int mtu)
+{
+ /*
+ * reduce IB headers from effective IBoE MTU. 28 stands for
+ * atomic header which is the biggest possible header after BTH
+ */
+ mtu = mtu - IB_GRH_BYTES - IB_BTH_BYTES - 28;
+
+ if (mtu >= ib_mtu_enum_to_int(IB_MTU_4096))
+ return IB_MTU_4096;
+ else if (mtu >= ib_mtu_enum_to_int(IB_MTU_2048))
+ return IB_MTU_2048;
+ else if (mtu >= ib_mtu_enum_to_int(IB_MTU_1024))
+ return IB_MTU_1024;
+ else if (mtu >= ib_mtu_enum_to_int(IB_MTU_512))
+ return IB_MTU_512;
+ else if (mtu >= ib_mtu_enum_to_int(IB_MTU_256))
+ return IB_MTU_256;
+ else
+ return 0;
+}
+
+static inline int iboe_get_rate(struct net_device *dev)
+{
+ struct ethtool_cmd cmd;
+
+ if (!dev->ethtool_ops || !dev->ethtool_ops->get_settings ||
+ dev->ethtool_ops->get_settings(dev, &cmd))
+ return IB_RATE_PORT_CURRENT;
+
+ if (cmd.speed >= 40000)
+ return IB_RATE_40_GBPS;
+ else if (cmd.speed >= 30000)
+ return IB_RATE_30_GBPS;
+ else if (cmd.speed >= 20000)
+ return IB_RATE_20_GBPS;
+ else if (cmd.speed >= 10000)
+ return IB_RATE_10_GBPS;
+ else
+ return IB_RATE_PORT_CURRENT;
+}
+
+static inline int rdma_link_local_addr(struct in6_addr *addr)
+{
+ if (addr->s6_addr32[0] == htonl(0xfe800000) &&
+ addr->s6_addr32[1] == 0)
+ return 1;
+
+ return 0;
+}
+
+static inline void rdma_get_ll_mac(struct in6_addr *addr, u8 *mac)
+{
+ memcpy(mac, &addr->s6_addr[8], 3);
+ memcpy(mac + 3, &addr->s6_addr[13], 3);
+ mac[0] ^= 2;
+}
+
+static inline int rdma_is_multicast_addr(struct in6_addr *addr)
+{
+ return addr->s6_addr[0] == 0xff;
+}
+
+static inline void rdma_get_mcast_mac(struct in6_addr *addr, u8 *mac)
+{
+ int i;
+
+ mac[0] = 0x33;
+ mac[1] = 0x33;
+ for (i = 2; i < 6; ++i)
+ mac[i] = addr->s6_addr[i + 10];
+}
+
#endif /* IB_ADDR_H */