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[(223.70.159.239)] by mailgw.kylinos.cn (envelope-from ) (Generic MTA with TLSv1.3 TLS_AES_256_GCM_SHA384 256/256) with ESMTP id 1891413485; Fri, 15 May 2026 15:33:21 +0800 From: Tao Cui To: leon@kernel.org, jgg@ziepe.ca, linux-rdma@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Tao Cui Subject: [PATCH rdma-next v2] RDMA/nldev: add resource summary max values for usage display Date: Fri, 15 May 2026 15:33:07 +0800 Message-ID: <20260515073307.428768-1-cuitao@kylinos.cn> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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 --- 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/nlde= v.c index 96c745d5bac4..879aaa7960fe 100644 --- a/drivers/infiniband/core/nldev.c +++ b/drivers/infiniband/core/nldev.c @@ -187,6 +187,7 @@ static const struct nla_policy nldev_policy[RDMA_NLDEV_= ATTR_MAX] =3D { [RDMA_NLDEV_ATTR_FRMR_POOLS_AGING_PERIOD] =3D { .type =3D NLA_U32 }, [RDMA_NLDEV_ATTR_FRMR_POOL_PINNED_HANDLES] =3D { .type =3D NLA_U32 }, [RDMA_NLDEV_ATTR_FRMR_POOL_KEY_KERNEL_VENDOR_KEY] =3D { .type =3D NLA_U64= }, + [RDMA_NLDEV_ATTR_RES_SUMMARY_ENTRY_MAX] =3D { .type =3D NLA_U64 }, }; =20 static int put_driver_name_print_type(struct sk_buff *msg, const char *nam= e, @@ -412,7 +413,7 @@ static int fill_port_info(struct sk_buff *msg, } =20 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; =20 @@ -426,6 +427,9 @@ 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 (nla_put_u64_64bit(msg, RDMA_NLDEV_ATTR_RES_SUMMARY_ENTRY_MAX, max, + RDMA_NLDEV_ATTR_PAD)) + goto err; =20 nla_nest_end(msg, entry_attr); return 0; @@ -449,7 +453,7 @@ static int fill_res_info(struct sk_buff *msg, struct ib= _device *device, }; =20 struct nlattr *table_attr; - int ret, i, curr; + int ret, i, curr, max =3D 0; =20 if (fill_nldev_handle(msg, device)) return -EMSGSIZE; @@ -462,7 +466,26 @@ static int fill_res_info(struct sk_buff *msg, struct i= b_device *device, if (!names[i]) continue; curr =3D rdma_restrack_count(device, i, show_details); - ret =3D fill_res_info_entry(msg, names[i], curr); + switch (i) { + case RDMA_RESTRACK_QP: + max =3D device->attrs.max_qp; + break; + case RDMA_RESTRACK_CQ: + max =3D device->attrs.max_cq; + break; + case RDMA_RESTRACK_MR: + max =3D device->attrs.max_mr; + break; + case RDMA_RESTRACK_PD: + max =3D device->attrs.max_pd; + break; + case RDMA_RESTRACK_SRQ: + max =3D device->attrs.max_srq; + break; + default: + max =3D 0; + } + ret =3D 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_netl= ink.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 */ =20 + /* + * Resource summary entry maximum value. + */ + RDMA_NLDEV_ATTR_RES_SUMMARY_ENTRY_MAX, /* u64 */ + /* * Always the end */ --=20 2.43.0