RDMA/nldev: Expose whether RDMA monitoring is supported

Extend the "rdma sys" command to display whether RDMA
monitoring is supported.

RDMA monitoring is not supported in mlx4 because it does
not use the ib_device_set_netdev() API, which sends the
RDMA events.

Example output for kernel where monitoring is supported:
$ rdma sys show
netns shared privileged-qkey off monitor on copy-on-fork on

Example output for kernel where monitoring is not supported:
$ rdma sys show
netns shared privileged-qkey off monitor off copy-on-fork on

Signed-off-by: Chiara Meiohas <cmeiohas@nvidia.com>
Signed-off-by: Michael Guralnik <michaelgur@nvidia.com>
Link: https://patch.msgid.link/20240909173025.30422-8-michaelgur@nvidia.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>

diff --git a/drivers/infiniband/core/nldev.c b/drivers/infiniband/core/nldev.c
index 70b3fa0469f24e139f2e5e65c7cc2e08d42c17b0..10b1411ac53d8e9c89b6705659e772eb84f4c923 100644 (file)
--- a/drivers/infiniband/core/nldev.c
+++ b/drivers/infiniband/core/nldev.c
@@ -1952,6 +1952,12 @@ static int nldev_sys_get_doit(struct sk_buff *skb, struct nlmsghdr *nlh,
                nlmsg_free(msg);
                return err;
        }
+
+       err = nla_put_u8(msg, RDMA_NLDEV_SYS_ATTR_MONITOR_MODE, 1);
+       if (err) {
+               nlmsg_free(msg);
+               return err;
+       }
        /*
         * Copy-on-fork is supported.
         * See commits:

diff --git a/include/uapi/rdma/rdma_netlink.h b/include/uapi/rdma/rdma_netlink.h
index 5f9636d26050eed404d37f345eb0fcf22870f5fc..39be09c0ffbb0b116b43bed2812a1debb4bcc2df 100644 (file)
--- a/include/uapi/rdma/rdma_netlink.h
+++ b/include/uapi/rdma/rdma_netlink.h
@@ -579,6 +579,7 @@ enum rdma_nldev_attr {
 
        RDMA_NLDEV_ATTR_EVENT_TYPE,             /* u8 */
 
+       RDMA_NLDEV_SYS_ATTR_MONITOR_MODE,       /* u8 */
        /*
         * Always the end
         */