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rdma: Autoload netlink client modules
If a message comes in and we do not have the client in the table, then try to load the module supplying that client using MODULE_ALIAS to find it. This duplicates the scheme seen in other netlink muxes (eg nfnetlink). Signed-off-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com> Reviewed-by: Leon Romanovsky <leonro@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
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@ -4537,5 +4537,7 @@ static void __exit cma_cleanup(void)
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destroy_workqueue(cma_wq);
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}
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MODULE_ALIAS_RDMA_NETLINK(RDMA_NL_RDMA_CM, 1);
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module_init(cma_init);
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module_exit(cma_cleanup);
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@ -1252,5 +1252,7 @@ static void __exit ib_core_cleanup(void)
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destroy_workqueue(ib_wq);
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}
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MODULE_ALIAS_RDMA_NETLINK(RDMA_NL_LS, 4);
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module_init(ib_core_init);
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module_exit(ib_core_cleanup);
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@ -1200,5 +1200,7 @@ static void __exit iw_cm_cleanup(void)
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iwpm_exit(RDMA_NL_IWCM);
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}
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MODULE_ALIAS_RDMA_NETLINK(RDMA_NL_IWCM, 2);
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module_init(iw_cm_init);
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module_exit(iw_cm_cleanup);
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@ -84,6 +84,15 @@ static bool is_nl_valid(unsigned int type, unsigned int op)
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return false;
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cb_table = rdma_nl_types[type].cb_table;
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#ifdef CONFIG_MODULES
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if (!cb_table) {
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mutex_unlock(&rdma_nl_mutex);
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request_module("rdma-netlink-subsys-%d", type);
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mutex_lock(&rdma_nl_mutex);
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cb_table = rdma_nl_types[type].cb_table;
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}
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#endif
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if (!cb_table || (!cb_table[op].dump && !cb_table[op].doit))
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return false;
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return true;
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@ -30,6 +30,7 @@
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <linux/module.h>
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#include <net/netlink.h>
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#include <rdma/rdma_netlink.h>
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@ -320,3 +321,5 @@ void __exit nldev_exit(void)
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{
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rdma_nl_unregister(RDMA_NL_NLDEV);
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}
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MODULE_ALIAS_RDMA_NETLINK(RDMA_NL_NLDEV, 5);
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@ -17,6 +17,18 @@ enum rdma_nl_flags {
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RDMA_NL_ADMIN_PERM = 1 << 0,
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};
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/* Define this module as providing netlink services for NETLINK_RDMA, with
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* index _index. Since the client indexes were setup in a uapi header as an
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* enum and we do no want to change that, the user must supply the expanded
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* constant as well and the compiler checks they are the same.
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*/
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#define MODULE_ALIAS_RDMA_NETLINK(_index, _val) \
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static inline void __chk_##_index(void) \
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{ \
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BUILD_BUG_ON(_index != _val); \
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} \
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MODULE_ALIAS("rdma-netlink-subsys-" __stringify(_val))
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/**
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* Register client in RDMA netlink.
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* @index: Index of the added client
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