From: Jason Gunthorpe <jgg@mellanox.com>
Date: Thu, 9 Aug 2018 20:14:38 -0600
Subject: IB/uverbs: Provide implementation private memory for the
uverbs_attr_bundle
Patch-mainline: v4.19-rc1
Git-commit: 4b3dd2bbf0818ccb23e7f2831f2ca4a86789cd1f
References: bsc#1103992 FATE#326009
This already existed as the anonymous 'ctx' structure, but this was not
really a useful form. Hoist this struct into bundle_priv and rework the
internal things to use it instead.
Move a bunch of the processing internal state into the priv and reduce the
excessive use of function arguments.
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
drivers/infiniband/core/uverbs_ioctl.c | 112 ++++++++++++++++-----------------
include/rdma/uverbs_ioctl.h | 1
2 files changed, 58 insertions(+), 55 deletions(-)
--- a/drivers/infiniband/core/uverbs_ioctl.c
+++ b/drivers/infiniband/core/uverbs_ioctl.c
@@ -35,6 +35,18 @@
#include "rdma_core.h"
#include "uverbs.h"
+struct bundle_priv {
+ struct ib_uverbs_attr __user *user_attrs;
+ struct ib_uverbs_attr *uattrs;
+ struct uverbs_obj_attr *destroy_attr;
+
+ /*
+ * Must be last. bundle ends in a flex array which overlaps
+ * internal_buffer.
+ */
+ struct uverbs_attr_bundle bundle;
+};
+
static bool uverbs_is_attr_cleared(const struct ib_uverbs_attr *uattr,
u16 len)
{
@@ -46,12 +58,11 @@ static bool uverbs_is_attr_cleared(const
0, uattr->len - len);
}
-static int uverbs_process_attr(struct ib_uverbs_file *ufile,
+static int uverbs_process_attr(struct bundle_priv *pbundle,
const struct ib_uverbs_attr *uattr,
u16 attr_id,
const struct uverbs_attr_spec_hash *attr_spec_bucket,
struct uverbs_attr_bundle_hash *attr_bundle_h,
- struct uverbs_obj_attr **destroy_attr,
struct ib_uverbs_attr __user *uattr_ptr)
{
const struct uverbs_attr_spec *spec;
@@ -147,9 +158,9 @@ static int uverbs_process_attr(struct ib
/* specs are allowed to have only one destroy attribute */
WARN_ON(spec->u.obj.access == UVERBS_ACCESS_DESTROY &&
- *destroy_attr);
+ pbundle->destroy_attr);
if (spec->u.obj.access == UVERBS_ACCESS_DESTROY)
- *destroy_attr = o_attr;
+ pbundle->destroy_attr = o_attr;
/*
* The type of uattr->data is u64 for UVERBS_ATTR_TYPE_IDR and
@@ -159,7 +170,7 @@ static int uverbs_process_attr(struct ib
*/
o_attr->uobject = uverbs_get_uobject_from_file(
spec->u.obj.obj_type,
- ufile,
+ pbundle->bundle.ufile,
spec->u.obj.access,
uattr->data_s64);
@@ -187,10 +198,11 @@ static int uverbs_process_attr(struct ib
return 0;
}
-static int uverbs_finalize_attrs(struct uverbs_attr_bundle *attrs_bundle,
+static int uverbs_finalize_attrs(struct bundle_priv *pbundle,
struct uverbs_attr_spec_hash *const *spec_hash,
size_t num, bool commit)
{
+ struct uverbs_attr_bundle *attrs_bundle = &pbundle->bundle;
unsigned int i;
int ret = 0;
@@ -233,27 +245,25 @@ static int uverbs_finalize_attrs(struct
return ret;
}
-static int uverbs_uattrs_process(struct ib_uverbs_file *ufile,
- const struct ib_uverbs_attr *uattrs,
- size_t num_uattrs,
+static int uverbs_uattrs_process(size_t num_uattrs,
const struct uverbs_method_spec *method,
- struct uverbs_attr_bundle *attr_bundle,
- struct uverbs_obj_attr **destroy_attr,
- struct ib_uverbs_attr __user *uattr_ptr)
+ struct bundle_priv *pbundle)
{
+ struct uverbs_attr_bundle *attr_bundle = &pbundle->bundle;
+ struct ib_uverbs_attr __user *uattr_ptr = pbundle->user_attrs;
size_t i;
int ret = 0;
int num_given_buckets = 0;
for (i = 0; i < num_uattrs; i++) {
- const struct ib_uverbs_attr *uattr = &uattrs[i];
+ const struct ib_uverbs_attr *uattr = &pbundle->uattrs[i];
u16 attr_id = uattr->attr_id;
struct uverbs_attr_spec_hash *attr_spec_bucket;
ret = uverbs_ns_idx(&attr_id, method->num_buckets);
if (ret < 0 || !method->attr_buckets[ret]) {
if (uattr->flags & UVERBS_ATTR_F_MANDATORY) {
- uverbs_finalize_attrs(attr_bundle,
+ uverbs_finalize_attrs(pbundle,
method->attr_buckets,
num_given_buckets,
false);
@@ -270,12 +280,13 @@ static int uverbs_uattrs_process(struct
num_given_buckets = ret + 1;
attr_spec_bucket = method->attr_buckets[ret];
- ret = uverbs_process_attr(ufile, uattr, attr_id,
+ ret = uverbs_process_attr(pbundle,
+ uattr, attr_id,
attr_spec_bucket,
- &attr_bundle->hash[ret], destroy_attr,
+ &attr_bundle->hash[ret],
uattr_ptr++);
if (ret) {
- uverbs_finalize_attrs(attr_bundle,
+ uverbs_finalize_attrs(pbundle,
method->attr_buckets,
num_given_buckets,
false);
@@ -287,8 +298,9 @@ static int uverbs_uattrs_process(struct
}
static int uverbs_validate_kernel_mandatory(const struct uverbs_method_spec *method_spec,
- struct uverbs_attr_bundle *attr_bundle)
+ struct bundle_priv *pbundle)
{
+ struct uverbs_attr_bundle *attr_bundle = &pbundle->bundle;
unsigned int i;
for (i = 0; i < attr_bundle->num_buckets; i++) {
@@ -316,27 +328,22 @@ static int uverbs_validate_kernel_mandat
return 0;
}
-static int uverbs_handle_method(struct ib_uverbs_attr __user *uattr_ptr,
- const struct ib_uverbs_attr *uattrs,
- size_t num_uattrs,
- struct ib_device *ibdev,
- struct ib_uverbs_file *ufile,
+static int uverbs_handle_method(size_t num_uattrs,
const struct uverbs_method_spec *method_spec,
- struct uverbs_attr_bundle *attr_bundle)
+ struct bundle_priv *pbundle)
{
+ struct uverbs_attr_bundle *attr_bundle = &pbundle->bundle;
int ret;
int finalize_ret;
int num_given_buckets;
- struct uverbs_obj_attr *destroy_attr = NULL;
num_given_buckets =
- uverbs_uattrs_process(ufile, uattrs, num_uattrs, method_spec,
- attr_bundle, &destroy_attr, uattr_ptr);
+ uverbs_uattrs_process(num_uattrs, method_spec, pbundle);
if (num_given_buckets <= 0)
return -EINVAL;
attr_bundle->num_buckets = num_given_buckets;
- ret = uverbs_validate_kernel_mandatory(method_spec, attr_bundle);
+ ret = uverbs_validate_kernel_mandatory(method_spec, pbundle);
if (ret)
goto cleanup;
@@ -344,21 +351,21 @@ static int uverbs_handle_method(struct i
* We destroy the HW object before invoking the handler, handlers do
* not get to manipulate the HW objects.
*/
- if (destroy_attr) {
- ret = uobj_destroy(destroy_attr->uobject);
+ if (pbundle->destroy_attr) {
+ ret = uobj_destroy(pbundle->destroy_attr->uobject);
if (ret)
goto cleanup;
}
- ret = method_spec->handler(ufile, attr_bundle);
+ ret = method_spec->handler(pbundle->bundle.ufile, attr_bundle);
- if (destroy_attr) {
- uobj_put_destroy(destroy_attr->uobject);
- destroy_attr->uobject = NULL;
+ if (pbundle->destroy_attr) {
+ uobj_put_destroy(pbundle->destroy_attr->uobject);
+ pbundle->destroy_attr->uobject = NULL;
}
cleanup:
- finalize_ret = uverbs_finalize_attrs(attr_bundle,
+ finalize_ret = uverbs_finalize_attrs(pbundle,
method_spec->attr_buckets,
attr_bundle->num_buckets,
!ret);
@@ -370,16 +377,13 @@ cleanup:
static long ib_uverbs_cmd_verbs(struct ib_device *ib_dev,
struct ib_uverbs_file *file,
struct ib_uverbs_ioctl_hdr *hdr,
- void __user *buf)
+ struct ib_uverbs_attr __user *user_attrs)
{
const struct uverbs_object_spec *object_spec;
const struct uverbs_method_spec *method_spec;
long err = 0;
unsigned int i;
- struct {
- struct ib_uverbs_attr *uattrs;
- struct uverbs_attr_bundle *uverbs_attr_bundle;
- } *ctx = NULL;
+ struct bundle_priv *ctx;
struct uverbs_attr *curr_attr;
unsigned long *curr_bitmap;
size_t ctx_size;
@@ -397,12 +401,11 @@ static long ib_uverbs_cmd_verbs(struct i
return -EPROTONOSUPPORT;
ctx_size = sizeof(*ctx) +
- sizeof(struct uverbs_attr_bundle) +
sizeof(struct uverbs_attr_bundle_hash) * method_spec->num_buckets +
sizeof(*ctx->uattrs) * hdr->num_attrs +
- sizeof(*ctx->uverbs_attr_bundle->hash[0].attrs) *
+ sizeof(*ctx->bundle.hash[0].attrs) *
method_spec->num_child_attrs +
- sizeof(*ctx->uverbs_attr_bundle->hash[0].valid_bitmap) *
+ sizeof(*ctx->bundle.hash[0].valid_bitmap) *
(method_spec->num_child_attrs / BITS_PER_LONG +
method_spec->num_buckets);
@@ -413,10 +416,8 @@ static long ib_uverbs_cmd_verbs(struct i
if (!ctx)
return -ENOMEM;
- ctx->uverbs_attr_bundle = (void *)ctx + sizeof(*ctx);
- ctx->uattrs = (void *)(ctx->uverbs_attr_bundle + 1) +
- (sizeof(ctx->uverbs_attr_bundle->hash[0]) *
- method_spec->num_buckets);
+ ctx->uattrs = (void *)(ctx + 1) +
+ (sizeof(ctx->bundle.hash[0]) * method_spec->num_buckets);
curr_attr = (void *)(ctx->uattrs + hdr->num_attrs);
curr_bitmap = (void *)(curr_attr + method_spec->num_child_attrs);
@@ -432,23 +433,25 @@ static long ib_uverbs_cmd_verbs(struct i
curr_num_attrs = method_spec->attr_buckets[i]->num_attrs;
- ctx->uverbs_attr_bundle->hash[i].attrs = curr_attr;
+ ctx->bundle.hash[i].attrs = curr_attr;
curr_attr += curr_num_attrs;
- ctx->uverbs_attr_bundle->hash[i].num_attrs = curr_num_attrs;
- ctx->uverbs_attr_bundle->hash[i].valid_bitmap = curr_bitmap;
+ ctx->bundle.hash[i].num_attrs = curr_num_attrs;
+ ctx->bundle.hash[i].valid_bitmap = curr_bitmap;
bitmap_zero(curr_bitmap, curr_num_attrs);
curr_bitmap += BITS_TO_LONGS(curr_num_attrs);
}
- err = copy_from_user(ctx->uattrs, buf,
+ err = copy_from_user(ctx->uattrs, user_attrs,
sizeof(*ctx->uattrs) * hdr->num_attrs);
if (err) {
err = -EFAULT;
goto out;
}
- err = uverbs_handle_method(buf, ctx->uattrs, hdr->num_attrs, ib_dev,
- file, method_spec, ctx->uverbs_attr_bundle);
+ ctx->destroy_attr = NULL;
+ ctx->bundle.ufile = file;
+ ctx->user_attrs = user_attrs;
+ err = uverbs_handle_method(hdr->num_attrs, method_spec, ctx);
/*
* EPROTONOSUPPORT is ONLY to be returned if the ioctl framework can
@@ -499,8 +502,7 @@ long ib_uverbs_ioctl(struct file *filp,
goto out;
}
- err = ib_uverbs_cmd_verbs(ib_dev, file, &hdr,
- (__user void *)arg + sizeof(hdr));
+ err = ib_uverbs_cmd_verbs(ib_dev, file, &hdr, user_hdr->attrs);
} else {
err = -ENOIOCTLCMD;
}
--- a/include/rdma/uverbs_ioctl.h
+++ b/include/rdma/uverbs_ioctl.h
@@ -494,6 +494,7 @@ struct uverbs_attr_bundle_hash {
};
struct uverbs_attr_bundle {
+ struct ib_uverbs_file *ufile;
size_t num_buckets;
struct uverbs_attr_bundle_hash hash[];
};