From: Guy Shapiro <guysh@xxxxxxxxxxxx>
Implement the get_net_device_by_port_pkey_ip callback that returns network
device to ib_core according to connection parameters. Check the ipoib
device and iterate over all child devices to look for a match.
For each IPoIB device we iterate through all upper devices when searching
for a matching IP, in order to support bonding.
Signed-off-by: Guy Shapiro <guysh@xxxxxxxxxxxx>
Signed-off-by: Haggai Eran <haggaie@xxxxxxxxxxxx>
Signed-off-by: Yotam Kenneth <yotamke@xxxxxxxxxxxx>
Signed-off-by: Shachar Raindel <raindel@xxxxxxxxxxxx>
---
drivers/infiniband/ulp/ipoib/ipoib_main.c | 229 +++++++++++++++++++++++++++++-
1 file changed, 228 insertions(+), 1 deletion(-)
diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c
index cca1a0c91ec4..36536ce5a3e2 100644
--- a/drivers/infiniband/ulp/ipoib/ipoib_main.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c
@@ -48,6 +48,9 @@
#include <linux/jhash.h>
#include <net/arp.h>
+#include <net/addrconf.h>
+#include <linux/inetdevice.h>
+#include <rdma/ib_cache.h>
#define DRV_VERSION "1.0.0"
@@ -91,11 +94,16 @@ struct ib_sa_client ipoib_sa_client;
static void ipoib_add_one(struct ib_device *device);
static void ipoib_remove_one(struct ib_device *device, void *client_data);
static void ipoib_neigh_reclaim(struct rcu_head *rp);
+static struct net_device *ipoib_get_net_dev_by_params(
+ struct ib_device *dev, u8 port, u16 pkey,
+ const union ib_gid *gid, const struct sockaddr *addr,
+ void *client_data);
static struct ib_client ipoib_client = {
.name = "ipoib",
.add = ipoib_add_one,
- .remove = ipoib_remove_one
+ .remove = ipoib_remove_one,
+ .get_net_dev_by_params = ipoib_get_net_dev_by_params,
};
int ipoib_open(struct net_device *dev)
@@ -222,6 +230,225 @@ static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
return 0;
}
+/* Called with an RCU read lock taken */
+static bool ipoib_is_dev_match_addr_rcu(const struct sockaddr *addr,
+ struct net_device *dev)
+{
+ struct net *net = dev_net(dev);
+ struct in_device *in_dev;
+ struct sockaddr_in *addr_in = (struct sockaddr_in *)addr;
+ struct sockaddr_in6 *addr_in6 = (struct sockaddr_in6 *)addr;
+ __be32 ret_addr;
+
+ switch (addr->sa_family) {
+ case AF_INET:
+ in_dev = in_dev_get(dev);
+ if (!in_dev)
+ return false;
+
+ ret_addr = inet_confirm_addr(net, in_dev, 0,
+ addr_in->sin_addr.s_addr,
+ RT_SCOPE_HOST);
+ in_dev_put(in_dev);
+ if (ret_addr)
+ return true;
+
+ break;
+ case AF_INET6:
+ if (IS_ENABLED(CONFIG_IPV6) &&
+ ipv6_chk_addr(net, &addr_in6->sin6_addr, dev, 1))
+ return true;
+
+ break;
+ }
+ return false;
+}
+
+/**
+ * Find the master net_device on top of the given net_device.
+ * @dev: base IPoIB net_device
+ *
+ * Returns the master net_device with a reference held, or the same net_device
+ * if no master exists.
+ */
+static struct net_device *ipoib_get_master_net_dev(struct net_device *dev)
+{
+ struct net_device *master;
+
+ rcu_read_lock();
+ master = netdev_master_upper_dev_get_rcu(dev);
+ if (master)
+ dev_hold(master);
+ rcu_read_unlock();
+
+ if (master)
+ return master;
+
+ dev_hold(dev);
+ return dev;
+}
+
+/**
+ * Find a net_device matching the given address, which is an upper device of
+ * the given net_device.
+ * @addr: IP address to look for.
+ * @dev: base IPoIB net_device
+ *
+ * If found, returns the net_device with a reference held. Otherwise return
+ * NULL.
+ */
+static struct net_device *ipoib_get_net_dev_match_addr(
+ const struct sockaddr *addr, struct net_device *dev)
+{
+ struct net_device *upper,
+ *result = NULL;
+ struct list_head *iter;
+
+ rcu_read_lock();
+ if (ipoib_is_dev_match_addr_rcu(addr, dev)) {
+ dev_hold(dev);
+ result = dev;
+ goto out;
+ }
+
+ netdev_for_each_all_upper_dev_rcu(dev, upper, iter) {
+ if (ipoib_is_dev_match_addr_rcu(addr, upper)) {
+ dev_hold(upper);
+ result = upper;
+ break;
+ }
+ }
+out:
+ rcu_read_unlock();
+ return result;
+}
+
+/* returns the number of IPoIB netdevs on top a given ipoib device matching a
+ * pkey_index and address, if one exists.
+ *
+ * @found_net_dev: contains a matching net_device if the return value >= 1,
+ * with a reference held. */
+static int ipoib_match_gid_pkey_addr(struct ipoib_dev_priv *priv,
+ const union ib_gid *gid,
+ u16 pkey_index,
+ const struct sockaddr *addr,
+ int nesting,
+ struct net_device **found_net_dev)
+{
+ struct ipoib_dev_priv *child_priv;
+ struct net_device *net_dev = NULL;
+ int matches = 0;
+
+ if (priv->pkey_index == pkey_index &&
+ (!gid || !memcmp(gid, &priv->local_gid, sizeof(*gid)))) {
+ if (!addr) {
+ net_dev = ipoib_get_master_net_dev(priv->dev);
+ } else {
+ /* Verify the net_device matches the IP address, as
+ * IPoIB child devices currently share a GID. */
+ net_dev = ipoib_get_net_dev_match_addr(addr, priv->dev);
+ }
+ if (net_dev) {
+ if (!*found_net_dev)
+ *found_net_dev = net_dev;
+ else
+ dev_put(net_dev);
+ ++matches;
+ }
+ }
+
+ /* Check child interfaces */
+ down_read_nested(&priv->vlan_rwsem, nesting);
+ list_for_each_entry(child_priv, &priv->child_intfs, list) {
+ matches += ipoib_match_gid_pkey_addr(child_priv, gid,
+ pkey_index, addr,
+ nesting + 1,
+ found_net_dev);
+ if (matches > 1)
+ break;
+ }
+ up_read(&priv->vlan_rwsem);
+
+ return matches;
+}
+
+/* Returns the number of matching net_devs found (between 0 and 2). Also
+ * return the matching net_device in the @net_dev parameter, holding a
+ * reference to the net_device, if the number of matches >= 1 */
+static int __ipoib_get_net_dev_by_params(struct list_head *dev_list, u8 port,
+ u16 pkey_index,
+ const union ib_gid *gid,
+ const struct sockaddr *addr,
+ struct net_device **net_dev)
+{
+ struct ipoib_dev_priv *priv;
+ int matches = 0;
+
+ *net_dev = NULL;
+
+ list_for_each_entry(priv, dev_list, list) {
+ if (priv->port != port)
+ continue;
+
+ matches += ipoib_match_gid_pkey_addr(priv, gid, pkey_index,
+ addr, 0, net_dev);
+ if (matches > 1)
+ break;
+ }
+
+ return matches;
+}
+
+static struct net_device *ipoib_get_net_dev_by_params(
+ struct ib_device *dev, u8 port, u16 pkey,
+ const union ib_gid *gid, const struct sockaddr *addr,
+ void *client_data)
+{
+ struct net_device *net_dev;
+ struct list_head *dev_list = client_data;
+ u16 pkey_index;
+ int matches;
+ int ret;
+
+ if (!rdma_protocol_ib(dev, port))
+ return NULL;
+
+ ret = ib_find_cached_pkey(dev, port, pkey, &pkey_index);
+ if (ret)
+ return NULL;
+
+ if (!dev_list)
+ return NULL;
+
+ /* See if we can find a unique device matching the L2 parameters */
+ matches = __ipoib_get_net_dev_by_params(dev_list, port, pkey_index,
+ gid, NULL, &net_dev);
+
+ switch (matches) {
+ case 0:
+ return NULL;
+ case 1:
+ return net_dev;
+ }
+
+ dev_put(net_dev);
+
+ /* Couldn't find a unique device with L2 parameters only. Use L3
+ * address to uniquely match the net device */
+ matches = __ipoib_get_net_dev_by_params(dev_list, port, pkey_index,
+ gid, addr, &net_dev);
+ switch (matches) {
+ case 0:
+ return NULL;
+ default:
+ dev_warn_ratelimited(&dev->dev,
+ "duplicate IP address detected\n");
+ /* Fall through */
+ case 1:
+ return net_dev;
+ }
+}
+
int ipoib_set_mode(struct net_device *dev, const char *buf)
{
struct ipoib_dev_priv *priv = netdev_priv(dev);
--
1.7.11.2
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