From 5911f6d6e7cce5f35bcaabc1895616e10a6d0aa2 Mon Sep 17 00:00:00 2001 From: Tao Cui Date: Mon, 15 Jun 2026 08:36:46 +0800 Subject: [PATCH] RDMA/nldev: Add resource summary max values for usage display Add RDMA_NLDEV_ATTR_RES_SUMMARY_ENTRY_MAX netlink attribute to expose device resource limits (max_qp, max_cq, max_mr, max_pd, max_srq) in the resource summary alongside the existing current count. This allows userspace tools like iproute2's rdma to display resource usage in curr/max format. Expected output from "rdma resource show": 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 In JSON output, both "curr" and "max" fields will be provided so that scripts can compute percentages if needed. The new attribute is optional and backward compatible - old userspace tools will simply ignore it. Signed-off-by: Tao Cui Link: https://patch.msgid.link/20260615003646.168704-1-cui.tao@linux.dev Signed-off-by: Leon Romanovsky --- drivers/infiniband/core/nldev.c | 29 ++++++++++++++++++++++++++--- include/uapi/rdma/rdma_netlink.h | 5 +++++ 2 files changed, 31 insertions(+), 3 deletions(-) diff --git a/drivers/infiniband/core/nldev.c b/drivers/infiniband/core/nldev.c index 02a0a9c0a4a6..f599c24b34e8 100644 --- a/drivers/infiniband/core/nldev.c +++ b/drivers/infiniband/core/nldev.c @@ -188,6 +188,7 @@ static const struct nla_policy nldev_policy[RDMA_NLDEV_ATTR_MAX] = { [RDMA_NLDEV_ATTR_FRMR_POOLS_AGING_PERIOD] = { .type = NLA_U32 }, [RDMA_NLDEV_ATTR_FRMR_POOL_PINNED_HANDLES] = { .type = NLA_U32 }, [RDMA_NLDEV_ATTR_FRMR_POOL_KEY_KERNEL_VENDOR_KEY] = { .type = NLA_U64 }, + [RDMA_NLDEV_ATTR_RES_SUMMARY_ENTRY_MAX] = { .type = NLA_U64 }, }; static int put_driver_name_print_type(struct sk_buff *msg, const char *name, @@ -413,7 +414,7 @@ static int fill_port_info(struct sk_buff *msg, } static int fill_res_info_entry(struct sk_buff *msg, - const char *name, u64 curr) + const char *name, u64 curr, u64 max) { struct nlattr *entry_attr; @@ -427,6 +428,9 @@ static int fill_res_info_entry(struct sk_buff *msg, if (nla_put_u64_64bit(msg, RDMA_NLDEV_ATTR_RES_SUMMARY_ENTRY_CURR, curr, RDMA_NLDEV_ATTR_PAD)) goto err; + if (max && nla_put_u64_64bit(msg, RDMA_NLDEV_ATTR_RES_SUMMARY_ENTRY_MAX, + max, RDMA_NLDEV_ATTR_PAD)) + goto err; nla_nest_end(msg, entry_attr); return 0; @@ -450,7 +454,7 @@ static int fill_res_info(struct sk_buff *msg, struct ib_device *device, }; struct nlattr *table_attr; - int ret, i, curr; + int ret, i, curr, max; if (fill_nldev_handle(msg, device)) return -EMSGSIZE; @@ -463,7 +467,26 @@ static int fill_res_info(struct sk_buff *msg, struct ib_device *device, if (!names[i]) continue; curr = rdma_restrack_count(device, i, show_details); - ret = fill_res_info_entry(msg, names[i], curr); + switch (i) { + case RDMA_RESTRACK_QP: + max = device->attrs.max_qp; + break; + case RDMA_RESTRACK_CQ: + max = device->attrs.max_cq; + break; + case RDMA_RESTRACK_MR: + max = device->attrs.max_mr; + break; + case RDMA_RESTRACK_PD: + max = device->attrs.max_pd; + break; + case RDMA_RESTRACK_SRQ: + max = device->attrs.max_srq; + break; + default: + max = 0; + } + ret = fill_res_info_entry(msg, names[i], curr, max); if (ret) goto err; } diff --git a/include/uapi/rdma/rdma_netlink.h b/include/uapi/rdma/rdma_netlink.h index aac9782ddc09..3af946ecbac3 100644 --- a/include/uapi/rdma/rdma_netlink.h +++ b/include/uapi/rdma/rdma_netlink.h @@ -604,6 +604,11 @@ enum rdma_nldev_attr { RDMA_NLDEV_ATTR_FRMR_POOL_PINNED_HANDLES, /* u32 */ RDMA_NLDEV_ATTR_FRMR_POOL_KEY_KERNEL_VENDOR_KEY, /* u64 */ + /* + * Resource summary entry maximum value. + */ + RDMA_NLDEV_ATTR_RES_SUMMARY_ENTRY_MAX, /* u64 */ + /* * Always the end */