RDMA/core: Add interface to read device namespace sharing mode

Add an interface via netlink command to query whether rdma devices are
shared among multiple net namespaces or not. When using RDMAtool, it can
be queried as,

$rdma system show netns
netns shared

Signed-off-by: Parav Pandit <parav@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

diff --git a/drivers/infiniband/core/core_priv.h b/drivers/infiniband/core/core_priv.h
index fe5607ebca80cfe4048afc590f74f36cbc3ae29d..30c7d4a46b76283b32448718ae5b43c9aca62866 100644 (file)
--- a/drivers/infiniband/core/core_priv.h
+++ b/drivers/infiniband/core/core_priv.h
@@ -55,6 +55,7 @@ struct pkey_index_qp_list {
 };
 
 extern const struct attribute_group ib_dev_attr_group;
+extern bool ib_devices_shared_netns;
 
 int ib_device_register_sysfs(struct ib_device *device);
 void ib_device_unregister_sysfs(struct ib_device *device);

diff --git a/drivers/infiniband/core/device.c b/drivers/infiniband/core/device.c
index e6f82f4d4108bf6c3243d85ea4057532a9ed487a..0605208a73d321e4e8b2925017ba0d69a4648e78 100644 (file)
--- a/drivers/infiniband/core/device.c
+++ b/drivers/infiniband/core/device.c
@@ -127,7 +127,7 @@ static DEFINE_XARRAY_FLAGS(rdma_nets, XA_FLAGS_ALLOC);
  */
 static DECLARE_RWSEM(rdma_nets_rwsem);
 
-static bool ib_devices_shared_netns = true;
+bool ib_devices_shared_netns = true;
 module_param_named(netns_mode, ib_devices_shared_netns, bool, 0444);
 MODULE_PARM_DESC(netns_mode,
                 "Share device among net namespaces; default=1 (shared)");

diff --git a/drivers/infiniband/core/nldev.c b/drivers/infiniband/core/nldev.c
index 284e5f103fc931dcfc27ffa899f53f2ba34d88af..49c048738f946d0f5e3677e52ab1fab9db771ce3 100644 (file)
--- a/drivers/infiniband/core/nldev.c
+++ b/drivers/infiniband/core/nldev.c
@@ -116,6 +116,7 @@ static const struct nla_policy nldev_policy[RDMA_NLDEV_ATTR_MAX] = {
        [RDMA_NLDEV_ATTR_RES_CTXN]              = { .type = NLA_U32 },
        [RDMA_NLDEV_ATTR_LINK_TYPE]             = { .type = NLA_NUL_STRING,
                                    .len = RDMA_NLDEV_ATTR_ENTRY_STRLEN },
+       [RDMA_NLDEV_SYS_ATTR_NETNS_MODE]        = { .type = NLA_U8 },
 };
 
 static int put_driver_name_print_type(struct sk_buff *msg, const char *name,
@@ -1312,6 +1313,34 @@ static int nldev_dellink(struct sk_buff *skb, struct nlmsghdr *nlh,
        return 0;
 }
 
+static int nldev_get_sys_get_dumpit(struct sk_buff *skb,
+                                   struct netlink_callback *cb)
+{
+       struct nlattr *tb[RDMA_NLDEV_ATTR_MAX];
+       struct nlmsghdr *nlh;
+       int err;
+
+       err = nlmsg_parse(cb->nlh, 0, tb, RDMA_NLDEV_ATTR_MAX - 1,
+                         nldev_policy, NULL);
+       if (err)
+               return err;
+
+       nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
+                       RDMA_NL_GET_TYPE(RDMA_NL_NLDEV,
+                                        RDMA_NLDEV_CMD_SYS_GET),
+                       0, 0);
+
+       err = nla_put_u8(skb, RDMA_NLDEV_SYS_ATTR_NETNS_MODE,
+                        (u8)ib_devices_shared_netns);
+       if (err) {
+               nlmsg_cancel(skb, nlh);
+               return err;
+       }
+
+       nlmsg_end(skb, nlh);
+       return skb->len;
+}
+
 static const struct rdma_nl_cbs nldev_cb_table[RDMA_NLDEV_NUM_OPS] = {
        [RDMA_NLDEV_CMD_GET] = {
                .doit = nldev_get_doit,
@@ -1357,6 +1386,9 @@ static const struct rdma_nl_cbs nldev_cb_table[RDMA_NLDEV_NUM_OPS] = {
                .doit = nldev_res_get_pd_doit,
                .dump = nldev_res_get_pd_dumpit,
        },
+       [RDMA_NLDEV_CMD_SYS_GET] = {
+               .dump = nldev_get_sys_get_dumpit,
+       },
 };
 
 void __init nldev_init(void)

diff --git a/include/uapi/rdma/rdma_netlink.h b/include/uapi/rdma/rdma_netlink.h
index 5cc592728071a2526d325ded0f6279a0dd5cfbc2..6af88c736073b83ea65c85d08989c9da9c4afe99 100644 (file)
--- a/include/uapi/rdma/rdma_netlink.h
+++ b/include/uapi/rdma/rdma_netlink.h
@@ -261,7 +261,8 @@ enum rdma_nldev_command {
 
        RDMA_NLDEV_CMD_PORT_GET, /* can dump */
 
-       /* 6 - 8 are free to use */
+       RDMA_NLDEV_CMD_SYS_GET, /* can dump */
+       /* 7 - 8 are free to use */
 
        RDMA_NLDEV_CMD_RES_GET = 9, /* can dump */
 
@@ -472,6 +473,12 @@ enum rdma_nldev_attr {
         */
        RDMA_NLDEV_ATTR_LINK_TYPE,              /* string */
 
+       /*
+        * net namespace mode for rdma subsystem:
+        * either shared or exclusive among multiple net namespaces.
+        */
+       RDMA_NLDEV_SYS_ATTR_NETNS_MODE,         /* u8 */
+
        /*
         * Always the end
         */