Add extensible query device capabilities verb to allow adding new features.
ib_uverbs_ex_query_device is added and copy_query_dev_fields is used to copy
capability fields to be used by both ib_uverbs_query_device and
ib_uverbs_ex_query_device.
Signed-off-by: Eli Cohen <eli@xxxxxxxxxxxx>
---
Changes from v0:
1. Allow userspace to pass response buffer smaller than the kernel's.
2. Do not enforce comp_mask at input of query device.
3. Modify ib_copy_to_udata to copy the minimum size between the caller's
request and the size provided by userspace.
drivers/infiniband/core/uverbs.h | 1 +
drivers/infiniband/core/uverbs_cmd.c | 121 ++++++++++++++++++++++------------
drivers/infiniband/core/uverbs_main.c | 3 +-
include/rdma/ib_verbs.h | 5 +-
include/uapi/rdma/ib_user_verbs.h | 12 +++-
5 files changed, 98 insertions(+), 44 deletions(-)
diff --git a/drivers/infiniband/core/uverbs.h b/drivers/infiniband/core/uverbs.h
index 643c08a025a5..b716b0815644 100644
--- a/drivers/infiniband/core/uverbs.h
+++ b/drivers/infiniband/core/uverbs.h
@@ -258,5 +258,6 @@ IB_UVERBS_DECLARE_CMD(close_xrcd);
IB_UVERBS_DECLARE_EX_CMD(create_flow);
IB_UVERBS_DECLARE_EX_CMD(destroy_flow);
+IB_UVERBS_DECLARE_EX_CMD(query_device);
#endif /* UVERBS_H */
diff --git a/drivers/infiniband/core/uverbs_cmd.c b/drivers/infiniband/core/uverbs_cmd.c
index 5ba2a86aab6a..74ad0d0de92b 100644
--- a/drivers/infiniband/core/uverbs_cmd.c
+++ b/drivers/infiniband/core/uverbs_cmd.c
@@ -378,6 +378,52 @@ err:
return ret;
}
+static void copy_query_dev_fields(struct ib_uverbs_file *file,
+ struct ib_uverbs_query_device_resp *resp,
+ struct ib_device_attr *attr)
+{
+ resp->fw_ver = attr->fw_ver;
+ resp->node_guid = file->device->ib_dev->node_guid;
+ resp->sys_image_guid = attr->sys_image_guid;
+ resp->max_mr_size = attr->max_mr_size;
+ resp->page_size_cap = attr->page_size_cap;
+ resp->vendor_id = attr->vendor_id;
+ resp->vendor_part_id = attr->vendor_part_id;
+ resp->hw_ver = attr->hw_ver;
+ resp->max_qp = attr->max_qp;
+ resp->max_qp_wr = attr->max_qp_wr;
+ resp->device_cap_flags = attr->device_cap_flags;
+ resp->max_sge = attr->max_sge;
+ resp->max_sge_rd = attr->max_sge_rd;
+ resp->max_cq = attr->max_cq;
+ resp->max_cqe = attr->max_cqe;
+ resp->max_mr = attr->max_mr;
+ resp->max_pd = attr->max_pd;
+ resp->max_qp_rd_atom = attr->max_qp_rd_atom;
+ resp->max_ee_rd_atom = attr->max_ee_rd_atom;
+ resp->max_res_rd_atom = attr->max_res_rd_atom;
+ resp->max_qp_init_rd_atom = attr->max_qp_init_rd_atom;
+ resp->max_ee_init_rd_atom = attr->max_ee_init_rd_atom;
+ resp->atomic_cap = attr->atomic_cap;
+ resp->max_ee = attr->max_ee;
+ resp->max_rdd = attr->max_rdd;
+ resp->max_mw = attr->max_mw;
+ resp->max_raw_ipv6_qp = attr->max_raw_ipv6_qp;
+ resp->max_raw_ethy_qp = attr->max_raw_ethy_qp;
+ resp->max_mcast_grp = attr->max_mcast_grp;
+ resp->max_mcast_qp_attach = attr->max_mcast_qp_attach;
+ resp->max_total_mcast_qp_attach = attr->max_total_mcast_qp_attach;
+ resp->max_ah = attr->max_ah;
+ resp->max_fmr = attr->max_fmr;
+ resp->max_map_per_fmr = attr->max_map_per_fmr;
+ resp->max_srq = attr->max_srq;
+ resp->max_srq_wr = attr->max_srq_wr;
+ resp->max_srq_sge = attr->max_srq_sge;
+ resp->max_pkeys = attr->max_pkeys;
+ resp->local_ca_ack_delay = attr->local_ca_ack_delay;
+ resp->phys_port_cnt = file->device->ib_dev->phys_port_cnt;
+}
+
ssize_t ib_uverbs_query_device(struct ib_uverbs_file *file,
const char __user *buf,
int in_len, int out_len)
@@ -398,47 +444,7 @@ ssize_t ib_uverbs_query_device(struct ib_uverbs_file *file,
return ret;
memset(&resp, 0, sizeof resp);
-
- resp.fw_ver = attr.fw_ver;
- resp.node_guid = file->device->ib_dev->node_guid;
- resp.sys_image_guid = attr.sys_image_guid;
- resp.max_mr_size = attr.max_mr_size;
- resp.page_size_cap = attr.page_size_cap;
- resp.vendor_id = attr.vendor_id;
- resp.vendor_part_id = attr.vendor_part_id;
- resp.hw_ver = attr.hw_ver;
- resp.max_qp = attr.max_qp;
- resp.max_qp_wr = attr.max_qp_wr;
- resp.device_cap_flags = attr.device_cap_flags;
- resp.max_sge = attr.max_sge;
- resp.max_sge_rd = attr.max_sge_rd;
- resp.max_cq = attr.max_cq;
- resp.max_cqe = attr.max_cqe;
- resp.max_mr = attr.max_mr;
- resp.max_pd = attr.max_pd;
- resp.max_qp_rd_atom = attr.max_qp_rd_atom;
- resp.max_ee_rd_atom = attr.max_ee_rd_atom;
- resp.max_res_rd_atom = attr.max_res_rd_atom;
- resp.max_qp_init_rd_atom = attr.max_qp_init_rd_atom;
- resp.max_ee_init_rd_atom = attr.max_ee_init_rd_atom;
- resp.atomic_cap = attr.atomic_cap;
- resp.max_ee = attr.max_ee;
- resp.max_rdd = attr.max_rdd;
- resp.max_mw = attr.max_mw;
- resp.max_raw_ipv6_qp = attr.max_raw_ipv6_qp;
- resp.max_raw_ethy_qp = attr.max_raw_ethy_qp;
- resp.max_mcast_grp = attr.max_mcast_grp;
- resp.max_mcast_qp_attach = attr.max_mcast_qp_attach;
- resp.max_total_mcast_qp_attach = attr.max_total_mcast_qp_attach;
- resp.max_ah = attr.max_ah;
- resp.max_fmr = attr.max_fmr;
- resp.max_map_per_fmr = attr.max_map_per_fmr;
- resp.max_srq = attr.max_srq;
- resp.max_srq_wr = attr.max_srq_wr;
- resp.max_srq_sge = attr.max_srq_sge;
- resp.max_pkeys = attr.max_pkeys;
- resp.local_ca_ack_delay = attr.local_ca_ack_delay;
- resp.phys_port_cnt = file->device->ib_dev->phys_port_cnt;
+ copy_query_dev_fields(file, &resp, &attr);
if (copy_to_user((void __user *) (unsigned long) cmd.response,
&resp, sizeof resp))
@@ -3253,3 +3259,36 @@ ssize_t ib_uverbs_destroy_srq(struct ib_uverbs_file *file,
return ret ? ret : in_len;
}
+
+int ib_uverbs_ex_query_device(struct ib_uverbs_file *file,
+ struct ib_udata *ucore,
+ struct ib_udata *uhw)
+{
+ struct ib_uverbs_ex_query_device_resp resp;
+ struct ib_uverbs_ex_query_device cmd;
+ struct ib_device_attr attr;
+ struct ib_device *device;
+ int err;
+
+ device = file->device->ib_dev;
+ if (ucore->inlen < sizeof(cmd))
+ return -EINVAL;
+
+ err = ib_copy_from_udata(&cmd, ucore, sizeof(cmd));
+ if (err)
+ return err;
+
+ err = device->query_device(device, &attr);
+ if (err)
+ return err;
+
+ memset(&resp, 0, sizeof(resp));
+ copy_query_dev_fields(file, &resp.base, &attr);
+ resp.comp_mask = 0;
+
+ err = ib_copy_to_udata(ucore, &resp, sizeof(resp));
+ if (err)
+ return err;
+
+ return 0;
+}
diff --git a/drivers/infiniband/core/uverbs_main.c b/drivers/infiniband/core/uverbs_main.c
index 71ab83fde472..974025028790 100644
--- a/drivers/infiniband/core/uverbs_main.c
+++ b/drivers/infiniband/core/uverbs_main.c
@@ -122,7 +122,8 @@ static int (*uverbs_ex_cmd_table[])(struct ib_uverbs_file *file,
struct ib_udata *ucore,
struct ib_udata *uhw) = {
[IB_USER_VERBS_EX_CMD_CREATE_FLOW] = ib_uverbs_ex_create_flow,
- [IB_USER_VERBS_EX_CMD_DESTROY_FLOW] = ib_uverbs_ex_destroy_flow
+ [IB_USER_VERBS_EX_CMD_DESTROY_FLOW] = ib_uverbs_ex_destroy_flow,
+ [IB_USER_VERBS_EX_CMD_QUERY_DEVICE] = ib_uverbs_ex_query_device
};
static void ib_uverbs_add_one(struct ib_device *device);
diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index 470a011d6fa4..97a999f9e4d8 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -1662,7 +1662,10 @@ static inline int ib_copy_from_udata(void *dest, struct ib_udata *udata, size_t
static inline int ib_copy_to_udata(struct ib_udata *udata, void *src, size_t len)
{
- return copy_to_user(udata->outbuf, src, len) ? -EFAULT : 0;
+ size_t copy_sz;
+
+ copy_sz = min_t(size_t, len, udata->outlen);
+ return copy_to_user(udata->outbuf, src, copy_sz) ? -EFAULT : 0;
}
/**
diff --git a/include/uapi/rdma/ib_user_verbs.h b/include/uapi/rdma/ib_user_verbs.h
index 26daf55ff76e..ed8c3d9da42c 100644
--- a/include/uapi/rdma/ib_user_verbs.h
+++ b/include/uapi/rdma/ib_user_verbs.h
@@ -90,8 +90,9 @@ enum {
};
enum {
+ IB_USER_VERBS_EX_CMD_QUERY_DEVICE = IB_USER_VERBS_CMD_QUERY_DEVICE,
IB_USER_VERBS_EX_CMD_CREATE_FLOW = IB_USER_VERBS_CMD_THRESHOLD,
- IB_USER_VERBS_EX_CMD_DESTROY_FLOW
+ IB_USER_VERBS_EX_CMD_DESTROY_FLOW,
};
/*
@@ -201,6 +202,15 @@ struct ib_uverbs_query_device_resp {
__u8 reserved[4];
};
+struct ib_uverbs_ex_query_device {
+ __u32 comp_mask;
+};
+
+struct ib_uverbs_ex_query_device_resp {
+ struct ib_uverbs_query_device_resp base;
+ __u32 comp_mask;
+};
+
struct ib_uverbs_query_port {
__u64 response;
__u8 port_num;
--
2.1.2
--
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