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IB/uverbs: Remove the ib_uverbs_attr pointer from each attr 

Memory in the bundle is valuable, do not waste it holding an 8 byte
pointer for the rare case of writing to a PTR_OUT. We can compute the
pointer by storing a small 1 byte array offset and the base address of the
uattr memory in the bundle private memory.

This also means we can access the kernel's copy of the ib_uverbs_attr, so
drop the copy of flags as well.

Since the uattr base should be private bundle information this also
de-inlines the already too big uverbs_copy_to inline and moves
create_udata into uverbs_ioctl.c so they can see the private struct
definition.

Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
This commit is contained in:
Jason Gunthorpe 2018-08-09 20:14:39 -06:00
parent 4b3dd2bbf0
commit 6a1f444fef
3 changed files with 72 additions and 63 deletions
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67
drivers/infiniband/core/uverbs_ioctl.c
View File

@ -84,7 +84,6 @@ static int uverbs_process_attr(struct bundle_priv *pbundle,
spec = &attr_spec_bucket->attrs[attr_id];
val_spec = spec;
e = &elements[attr_id];
e->uattr = uattr_ptr;
switch (spec->type) {
case UVERBS_ATTR_TYPE_ENUM_IN:
@ -124,8 +123,8 @@ static int uverbs_process_attr(struct bundle_priv *pbundle,
uattr->attr_data.reserved)
return -EINVAL;
e->ptr_attr.uattr_idx = uattr - pbundle->uattrs;
e->ptr_attr.len = uattr->len;
e->ptr_attr.flags = uattr->flags;
if (val_spec->alloc_and_copy && !uverbs_attr_ptr_is_inline(e)) {
void *p;
@ -181,7 +180,7 @@ static int uverbs_process_attr(struct bundle_priv *pbundle,
s64 id = o_attr->uobject->id;
/* Copy the allocated id to the user-space */
if (put_user(id, &e->uattr->data)) {
if (put_user(id, &uattr_ptr->data)) {
uverbs_finalize_object(o_attr->uobject,
UVERBS_ACCESS_NEW,
false);
@ -562,3 +561,65 @@ int uverbs_get_flags32(u32 *to, const struct uverbs_attr_bundle *attrs_bundle,
return 0;
}
EXPORT_SYMBOL(uverbs_get_flags32);
/*
* This is for ease of conversion. The purpose is to convert all drivers to
* use uverbs_attr_bundle instead of ib_udata. Assume attr == 0 is input and
* attr == 1 is output.
*/
void create_udata(struct uverbs_attr_bundle *bundle, struct ib_udata *udata)
{
struct bundle_priv *pbundle =
container_of(bundle, struct bundle_priv, bundle);
const struct uverbs_attr *uhw_in =
uverbs_attr_get(bundle, UVERBS_ATTR_UHW_IN);
const struct uverbs_attr *uhw_out =
uverbs_attr_get(bundle, UVERBS_ATTR_UHW_OUT);
if (!IS_ERR(uhw_in)) {
udata->inlen = uhw_in->ptr_attr.len;
if (uverbs_attr_ptr_is_inline(uhw_in))
udata->inbuf =
&pbundle->user_attrs[uhw_in->ptr_attr.uattr_idx]
.data;
else
udata->inbuf = u64_to_user_ptr(uhw_in->ptr_attr.data);
} else {
udata->inbuf = NULL;
udata->inlen = 0;
}
if (!IS_ERR(uhw_out)) {
udata->outbuf = u64_to_user_ptr(uhw_out->ptr_attr.data);
udata->outlen = uhw_out->ptr_attr.len;
} else {
udata->outbuf = NULL;
udata->outlen = 0;
}
}
int uverbs_copy_to(const struct uverbs_attr_bundle *bundle, size_t idx,
const void *from, size_t size)
{
struct bundle_priv *pbundle =
container_of(bundle, struct bundle_priv, bundle);
const struct uverbs_attr *attr = uverbs_attr_get(bundle, idx);
u16 flags;
size_t min_size;
if (IS_ERR(attr))
return PTR_ERR(attr);
min_size = min_t(size_t, attr->ptr_attr.len, size);
if (copy_to_user(u64_to_user_ptr(attr->ptr_attr.data), from, min_size))
return -EFAULT;
flags = pbundle->uattrs[attr->ptr_attr.uattr_idx].flags |
UVERBS_ATTR_F_VALID_OUTPUT;
if (put_user(flags,
&pbundle->user_attrs[attr->ptr_attr.uattr_idx].flags))
return -EFAULT;
return 0;
}
EXPORT_SYMBOL(uverbs_copy_to);

32
drivers/infiniband/core/uverbs_std_types.c
View File

@ -217,38 +217,6 @@ int uverbs_destroy_def_handler(struct ib_uverbs_file *file,
}
EXPORT_SYMBOL(uverbs_destroy_def_handler);
void create_udata(struct uverbs_attr_bundle *ctx, struct ib_udata *udata)
{
/*
* This is for ease of conversion. The purpose is to convert all drivers
* to use uverbs_attr_bundle instead of ib_udata.
* Assume attr == 0 is input and attr == 1 is output.
*/
const struct uverbs_attr *uhw_in =
uverbs_attr_get(ctx, UVERBS_ATTR_UHW_IN);
const struct uverbs_attr *uhw_out =
uverbs_attr_get(ctx, UVERBS_ATTR_UHW_OUT);
if (!IS_ERR(uhw_in)) {
udata->inlen = uhw_in->ptr_attr.len;
if (uverbs_attr_ptr_is_inline(uhw_in))
udata->inbuf = &uhw_in->uattr->data;
else
udata->inbuf = u64_to_user_ptr(uhw_in->ptr_attr.data);
} else {
udata->inbuf = NULL;
udata->inlen = 0;
}
if (!IS_ERR(uhw_out)) {
udata->outbuf = u64_to_user_ptr(uhw_out->ptr_attr.data);
udata->outlen = uhw_out->ptr_attr.len;
} else {
udata->outbuf = NULL;
udata->outlen = 0;
}
}
DECLARE_UVERBS_NAMED_OBJECT(
UVERBS_OBJECT_COMP_CHANNEL,
UVERBS_TYPE_ALLOC_FD(sizeof(struct ib_uverbs_completion_event_file),

36
include/rdma/uverbs_ioctl.h
View File

@ -461,8 +461,7 @@ struct uverbs_ptr_attr {
u64 data;
};
u16 len;
/* Combination of bits from enum UVERBS_ATTR_F_XXXX */
u16 flags;
u16 uattr_idx;
u8 enum_id;
};
@ -471,11 +470,6 @@ struct uverbs_obj_attr {
};
struct uverbs_attr {
/*
* pointer to the user-space given attribute, in order to write the
* new uobject's id or update flags.
*/
struct ib_uverbs_attr __user *uattr;
union {
struct uverbs_ptr_attr ptr_attr;
struct uverbs_obj_attr obj_attr;
@ -575,27 +569,6 @@ uverbs_attr_get_len(const struct uverbs_attr_bundle *attrs_bundle, u16 idx)
return attr->ptr_attr.len;
}
static inline int uverbs_copy_to(const struct uverbs_attr_bundle *attrs_bundle,
size_t idx, const void *from, size_t size)
{
const struct uverbs_attr *attr = uverbs_attr_get(attrs_bundle, idx);
u16 flags;
size_t min_size;
if (IS_ERR(attr))
return PTR_ERR(attr);
min_size = min_t(size_t, attr->ptr_attr.len, size);
if (copy_to_user(u64_to_user_ptr(attr->ptr_attr.data), from, min_size))
return -EFAULT;
flags = attr->ptr_attr.flags | UVERBS_ATTR_F_VALID_OUTPUT;
if (put_user(flags, &attr->uattr->flags))
return -EFAULT;
return 0;
}
static inline bool uverbs_attr_ptr_is_inline(const struct uverbs_attr *attr)
{
return attr->ptr_attr.len <= sizeof(attr->ptr_attr.data);
@ -676,6 +649,8 @@ int uverbs_get_flags64(u64 *to, const struct uverbs_attr_bundle *attrs_bundle,
size_t idx, u64 allowed_bits);
int uverbs_get_flags32(u32 *to, const struct uverbs_attr_bundle *attrs_bundle,
size_t idx, u64 allowed_bits);
int uverbs_copy_to(const struct uverbs_attr_bundle *attrs_bundle, size_t idx,
const void *from, size_t size);
#else
static inline int
uverbs_get_flags64(u64 *to, const struct uverbs_attr_bundle *attrs_bundle,
@ -689,6 +664,11 @@ uverbs_get_flags32(u32 *to, const struct uverbs_attr_bundle *attrs_bundle,
{
return -EINVAL;
}
static inline int uverbs_copy_to(const struct uverbs_attr_bundle *attrs_bundle,
size_t idx, const void *from, size_t size)
{
return -EINVAL;
}
#endif
/* =================================================