[PATCH iproute2-next v7 2/2] rdma: display resource limits in curr/max format
From: Tao Cui <hidden>
Date: 2026-07-16 11:53:08
Also in:
linux-rdma
Subsystem:
the rest · Maintainer:
Linus Torvalds
From: Tao Cui <redacted>
Parse the new RDMA_NLDEV_ATTR_RES_SUMMARY_ENTRY_MAX netlink attribute
to show resource limits alongside current counts in curr/max format:
Before: 0: mlx5_0: qp 123 cq 45 mr 200 pd 10
After: 0: mlx5_0: qp 123/131072 cq 45/65536 mr 200/1000000 pd 10/32768
JSON output provides separate <name> and <name>-max fields per resource
type, so scripts can compute usage against the device limit; resources
without an upper bound (e.g. cm_id, ctx) are reported without a -max
field:
$ rdma resource show -j
[{
"ifindex": 0,
"ifname": "mlx5_0",
"qp": 123, "qp-max": 131072,
"cq": 45, "cq-max": 65536,
"mr": 200, "mr-max": 1000000,
"pd": 10, "pd-max": 32768,
"cm_id": 0, "ctx": 0
}]
Backward compatible: no output change when the kernel lacks the new
attribute.
Signed-off-by: Tao Cui <redacted>
Link: https://lore.kernel.org/all/20260615003646.168704-1-cui.tao@linux.dev/ (local)
---
rdma/res.c | 16 +++++++++++++++-
rdma/utils.c | 1 +
2 files changed, 16 insertions(+), 1 deletion(-)
diff --git a/rdma/res.c b/rdma/res.c
index 062f0007..7efced8d 100644
--- a/rdma/res.c
+++ b/rdma/res.c@@ -55,7 +55,21 @@ static int res_print_summary(struct nlattr **tb) name = mnl_attr_get_str(nla_line[RDMA_NLDEV_ATTR_RES_SUMMARY_ENTRY_NAME]); curr = mnl_attr_get_u64(nla_line[RDMA_NLDEV_ATTR_RES_SUMMARY_ENTRY_CURR]); - res_print_u64(name, curr, nla_line[RDMA_NLDEV_ATTR_RES_SUMMARY_ENTRY_CURR]); + if (nla_line[RDMA_NLDEV_ATTR_RES_SUMMARY_ENTRY_MAX]) { + uint64_t max; + char max_name[64]; + + max = mnl_attr_get_u64( + nla_line[RDMA_NLDEV_ATTR_RES_SUMMARY_ENTRY_MAX]); + snprintf(max_name, sizeof(max_name), "%s-max", name); + print_u64(PRINT_JSON, name, NULL, curr); + print_u64(PRINT_JSON, max_name, NULL, max); + if (!is_json_context()) + pr_out("%s %" PRIu64 "/%" PRIu64 " ", name, curr, max); + } else { + res_print_u64(name, curr, + nla_line[RDMA_NLDEV_ATTR_RES_SUMMARY_ENTRY_CURR]); + } } return 0; }
diff --git a/rdma/utils.c b/rdma/utils.c
index 87003b2c..90ea1c55 100644
--- a/rdma/utils.c
+++ b/rdma/utils.c@@ -480,6 +480,7 @@ static const enum mnl_attr_data_type nldev_policy[RDMA_NLDEV_ATTR_MAX] = { [RDMA_NLDEV_ATTR_EVENT_TYPE] = MNL_TYPE_U8, [RDMA_NLDEV_SYS_ATTR_MONITOR_MODE] = MNL_TYPE_U8, [RDMA_NLDEV_ATTR_STAT_OPCOUNTER_ENABLED] = MNL_TYPE_U8, + [RDMA_NLDEV_ATTR_RES_SUMMARY_ENTRY_MAX] = MNL_TYPE_U64, }; static int rd_attr_check(const struct nlattr *attr, int *typep)
--
2.43.0