[RFC iproute2-next 3/4] rdma: Expose whether RDMA monitoring is supported

Michael Guralnik
2024-09-01T00:55:41Z

From: Chiara Meiohas <cmeiohas@nvidia.com>

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

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>
---
man/man8/rdma-system.8 | 9 +++++----
rdma/sys.c | 6 ++++++
rdma/utils.c | 1 +
3 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/man/man8/rdma-system.8 b/man/man8/rdma-system.8
index 554938eb..5373027a 100644
--- a/man/man8/rdma-system.8
+++ b/man/man8/rdma-system.8
@@ -38,8 +38,8 @@ rdma-system \- RDMA subsystem configuration
.SS rdma system set - set RDMA subsystem network namespace mode or
privileged qkey mode

-.SS rdma system show - display RDMA subsystem network namespace mode and
-privileged qkey state
+.SS rdma system show - display RDMA subsystem network namespace mode,
+privileged qkey state and whether RDMA monitoring is supported.

.PP
.I "NEWMODE"
@@ -66,8 +66,8 @@ controlled QKEY or not.
.PP
rdma system show
.RS 4
-Shows the state of RDMA subsystem network namespace mode on the system and
-the state of privileged qkey parameter.
+Shows the state of RDMA subsystem network namespace mode on the system,
+the state of privileged qkey parameter and whether RDMA monitor is supported.
.RE
.PP
rdma system set netns exclusive
@@ -100,6 +100,7 @@ is *not* allowed to specify a controlled QKEY.
.BR rdma (8),
.BR rdma-link (8),
.BR rdma-resource (8),
+.BR rdma-monitor (8),
.BR network_namespaces (7),
.BR namespaces (7),
.br
diff --git a/rdma/sys.c b/rdma/sys.c
index 7dbe4409..9f538e41 100644
--- a/rdma/sys.c
+++ b/rdma/sys.c
@@ -20,6 +20,7 @@ static const char *netns_modes_str[] = {
static int sys_show_parse_cb(const struct nlmsghdr *nlh, void *data)
{
struct nlattr *tb[RDMA_NLDEV_ATTR_MAX] = {};
+ uint8_t mon_mode = 0;
bool cof = false;

mnl_attr_parse(nlh, 0, rd_attr_cb, tb);
@@ -48,6 +49,10 @@ static int sys_show_parse_cb(const struct nlmsghdr *nlh, void *data)

}

+ if (tb[RDMA_NLDEV_SYS_ATTR_MONITOR_MODE])
+ mon_mode = mnl_attr_get_u8(tb[RDMA_NLDEV_SYS_ATTR_MONITOR_MODE]);
+ print_on_off(PRINT_ANY, "monitor", "monitor %s ", mon_mode);
+
if (tb[RDMA_NLDEV_SYS_ATTR_COPY_ON_FORK])
cof = mnl_attr_get_u8(tb[RDMA_NLDEV_SYS_ATTR_COPY_ON_FORK]);

@@ -77,6 +82,7 @@ static int sys_show(struct rd *rd)
{ NULL, sys_show_no_args},
{ "netns", sys_show_no_args},
{ "privileged-qkey", sys_show_no_args},
+ { "monitor", sys_show_no_args},
{ 0 }
};

diff --git a/rdma/utils.c b/rdma/utils.c
index bc104e0f..07cb0224 100644
--- a/rdma/utils.c
+++ b/rdma/utils.c
@@ -478,6 +478,7 @@ static const enum mnl_attr_data_type nldev_policy[RDMA_NLDEV_ATTR_MAX] = {
[RDMA_NLDEV_ATTR_DEV_TYPE] = MNL_TYPE_U8,
[RDMA_NLDEV_ATTR_PARENT_NAME] = MNL_TYPE_STRING,
[RDMA_NLDEV_ATTR_EVENT_TYPE] = MNL_TYPE_U8,
+ [RDMA_NLDEV_SYS_ATTR_MONITOR_MODE] = MNL_TYPE_U8,
};

static int rd_attr_check(const struct nlattr *attr, int *typep)
--
2.17.2