IB/cma: Separate port allocation to network namespaces

Keep a struct for each network namespace containing the IDRs for the RDMA
CM port spaces. The struct is created dynamically using the generic_net
mechanism.

This patch is internal infrastructure work for the following patches. In
this patch, init_net is statically used as the network namespace for
the new port-space API.

Signed-off-by: Haggai Eran <haggaie@mellanox.com>
Signed-off-by: Yotam Kenneth <yotamke@mellanox.com>
Signed-off-by: Shachar Raindel <raindel@mellanox.com>
Signed-off-by: Guy Shapiro <guysh@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

1 files changed, 70 insertions, 24 deletions

diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c
index 80a8b469a9a8..ac03c32ca7f1 100644
--- a/drivers/infiniband/core/cma.c
+++ b/drivers/infiniband/core/cma.c
@@ -44,6 +44,8 @@
 #include <linux/module.h>
 #include <net/route.h>
 
+#include <net/net_namespace.h>
+#include <net/netns/generic.h>
 #include <net/tcp.h>
 #include <net/ipv6.h>
 #include <net/ip_fib.h>
@@ -110,22 +112,33 @@ static LIST_HEAD(dev_list);
 static LIST_HEAD(listen_any_list);
 static DEFINE_MUTEX(lock);
 static struct workqueue_struct *cma_wq;
-static DEFINE_IDR(tcp_ps);
-static DEFINE_IDR(udp_ps);
-static DEFINE_IDR(ipoib_ps);
-static DEFINE_IDR(ib_ps);
+static int cma_pernet_id;
 
-static struct idr *cma_idr(enum rdma_port_space ps)
+struct cma_pernet {
+        struct idr tcp_ps;
+        struct idr udp_ps;
+        struct idr ipoib_ps;
+        struct idr ib_ps;
+};
+
+static struct cma_pernet *cma_pernet(struct net *net)
+{
+        return net_generic(net, cma_pernet_id);
+}
+
+static struct idr *cma_pernet_idr(struct net *net, enum rdma_port_space ps)
 {
+        struct cma_pernet *pernet = cma_pernet(net);
+
         switch (ps) {
         case RDMA_PS_TCP:
-                return &tcp_ps;
+                return &pernet->tcp_ps;
         case RDMA_PS_UDP:
-                return &udp_ps;
+                return &pernet->udp_ps;
         case RDMA_PS_IPOIB:
-                return &ipoib_ps;
+                return &pernet->ipoib_ps;
         case RDMA_PS_IB:
-                return &ib_ps;
+                return &pernet->ib_ps;
         default:
                 return NULL;
         }
@@ -145,24 +158,25 @@ struct rdma_bind_list {
         unsigned short          port;
 };
 
-static int cma_ps_alloc(enum rdma_port_space ps,
+static int cma_ps_alloc(struct net *net, enum rdma_port_space ps,
                         struct rdma_bind_list *bind_list, int snum)
 {
-        struct idr *idr = cma_idr(ps);
+        struct idr *idr = cma_pernet_idr(net, ps);
 
         return idr_alloc(idr, bind_list, snum, snum + 1, GFP_KERNEL);
 }
 
-static struct rdma_bind_list *cma_ps_find(enum rdma_port_space ps, int snum)
+static struct rdma_bind_list *cma_ps_find(struct net *net,
+                                          enum rdma_port_space ps, int snum)
 {
-        struct idr *idr = cma_idr(ps);
+        struct idr *idr = cma_pernet_idr(net, ps);
 
         return idr_find(idr, snum);
 }
 
-static void cma_ps_remove(enum rdma_port_space ps, int snum)
+static void cma_ps_remove(struct net *net, enum rdma_port_space ps, int snum)
 {
-        struct idr *idr = cma_idr(ps);
+        struct idr *idr = cma_pernet_idr(net, ps);
 
         idr_remove(idr, snum);
 }
@@ -1325,7 +1339,8 @@ static struct rdma_id_private *cma_id_from_event(struct ib_cm_id *cm_id,
                 }
         }
 
-        bind_list = cma_ps_find(rdma_ps_from_service_id(req.service_id),
+        bind_list = cma_ps_find(&init_net,
+                                rdma_ps_from_service_id(req.service_id),
                                 cma_port_from_service_id(req.service_id));
         id_priv = cma_find_listener(bind_list, cm_id, ib_event, &req, *net_dev);
         if (IS_ERR(id_priv) && *net_dev) {
@@ -1403,7 +1418,7 @@ static void cma_release_port(struct rdma_id_private *id_priv)
         mutex_lock(&lock);
         hlist_del(&id_priv->node);
         if (hlist_empty(&bind_list->owners)) {
-                cma_ps_remove(bind_list->ps, bind_list->port);
+                cma_ps_remove(&init_net, bind_list->ps, bind_list->port);
                 kfree(bind_list);
         }
         mutex_unlock(&lock);
@@ -2693,7 +2708,7 @@ static int cma_alloc_port(enum rdma_port_space ps,
         if (!bind_list)
                 return -ENOMEM;
 
-        ret = cma_ps_alloc(ps, bind_list, snum);
+        ret = cma_ps_alloc(&init_net, ps, bind_list, snum);
         if (ret < 0)
                 goto err;
 
@@ -2718,7 +2733,7 @@ static int cma_alloc_any_port(enum rdma_port_space ps,
         rover = prandom_u32() % remaining + low;
 retry:
         if (last_used_port != rover &&
-            !cma_ps_find(ps, (unsigned short)rover)) {
+            !cma_ps_find(&init_net, ps, (unsigned short)rover)) {
                 int ret = cma_alloc_port(ps, id_priv, rover);
                 /*
                  * Remember previously used port number in order to avoid
@@ -2784,7 +2799,7 @@ static int cma_use_port(enum rdma_port_space ps,
         if (snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
                 return -EACCES;
 
-        bind_list = cma_ps_find(ps, snum);
+        bind_list = cma_ps_find(&init_net, ps, snum);
         if (!bind_list) {
                 ret = cma_alloc_port(ps, id_priv, snum);
         } else {
@@ -4004,6 +4019,35 @@ static const struct ibnl_client_cbs cma_cb_table[] = {
                                        .module = THIS_MODULE },
 };
 
+static int cma_init_net(struct net *net)
+{
+        struct cma_pernet *pernet = cma_pernet(net);
+
+        idr_init(&pernet->tcp_ps);
+        idr_init(&pernet->udp_ps);
+        idr_init(&pernet->ipoib_ps);
+        idr_init(&pernet->ib_ps);
+
+        return 0;
+}
+
+static void cma_exit_net(struct net *net)
+{
+        struct cma_pernet *pernet = cma_pernet(net);
+
+        idr_destroy(&pernet->tcp_ps);
+        idr_destroy(&pernet->udp_ps);
+        idr_destroy(&pernet->ipoib_ps);
+        idr_destroy(&pernet->ib_ps);
+}
+
+static struct pernet_operations cma_pernet_operations = {
+        .init = cma_init_net,
+        .exit = cma_exit_net,
+        .id = &cma_pernet_id,
+        .size = sizeof(struct cma_pernet),
+};
+
 static int __init cma_init(void)
 {
         int ret;
@@ -4012,6 +4056,10 @@ static int __init cma_init(void)
         if (!cma_wq)
                 return -ENOMEM;
 
+        ret = register_pernet_subsys(&cma_pernet_operations);
+        if (ret)
+                goto err_wq;
+
         ib_sa_register_client(&sa_client);
         rdma_addr_register_client(&addr_client);
         register_netdevice_notifier(&cma_nb);
@@ -4029,6 +4077,7 @@ err:
         unregister_netdevice_notifier(&cma_nb);
         rdma_addr_unregister_client(&addr_client);
         ib_sa_unregister_client(&sa_client);
+err_wq:
         destroy_workqueue(cma_wq);
         return ret;
 }
@@ -4040,11 +4089,8 @@ static void __exit cma_cleanup(void)
         unregister_netdevice_notifier(&cma_nb);
         rdma_addr_unregister_client(&addr_client);
         ib_sa_unregister_client(&sa_client);
+        unregister_pernet_subsys(&cma_pernet_operations);
         destroy_workqueue(cma_wq);
-        idr_destroy(&tcp_ps);
-        idr_destroy(&udp_ps);
-        idr_destroy(&ipoib_ps);
-        idr_destroy(&ib_ps);
 }
 
 module_init(cma_init);