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iflib: mark isc_driver_version as constant

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From Jake:
The iflib core never modifies the isc_driver_version string. Allow
drivers to safely assign pointers to constant buffers by marking this
parameter const.

Submitted by:	Jacob Keller <jacob.e.keller@intel.com>
Reviewed by:	erj@, gallatin@, jhb@
MFC after:	1 week
Sponsored by:	Intel Corporation
Differential Revision:	https://reviews.freebsd.org/D19577
This commit is contained in:
Eric Joyner 2019-03-19 23:44:26 +00:00
parent 312437815a
commit 10a1e981d4
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=345312
4 changed files with 42 additions and 3 deletions
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20
share/man/man9/sysctl.9
View File

@ -48,6 +48,7 @@
.Nm SYSCTL_ADD_SBINTIME_MSEC ,
.Nm SYSCTL_ADD_SBINTIME_USEC ,
.Nm SYSCTL_ADD_STRING ,
.Nm SYSCTL_ADD_CONST_STRING ,
.Nm SYSCTL_ADD_STRUCT ,
.Nm SYSCTL_ADD_U8 ,
.Nm SYSCTL_ADD_U16 ,
@ -82,6 +83,7 @@
.Nm SYSCTL_SBINTIME_MSEC ,
.Nm SYSCTL_SBINTIME_USEC ,
.Nm SYSCTL_STRING ,
.Nm SYSCTL_CONST_STRING ,
.Nm SYSCTL_STRUCT ,
.Nm SYSCTL_U8 ,
.Nm SYSCTL_U16 ,
@ -291,6 +293,16 @@
.Fa "const char *descr"
.Fc
.Ft struct sysctl_oid *
.Fo SYSCTL_ADD_CONST_STRING
.Fa "struct sysctl_ctx_list *ctx"
.Fa "struct sysctl_oid_list *parent"
.Fa "int number"
.Fa "const char *name"
.Fa "int ctlflags"
.Fa "const char *ptr"
.Fa "const char *descr"
.Fc
.Ft struct sysctl_oid *
.Fo SYSCTL_ADD_STRUCT
.Fa "struct sysctl_ctx_list *ctx"
.Fa "struct sysctl_oid_list *parent"
@ -443,6 +455,7 @@
.Fn SYSCTL_SBINTIME_MSEC parent number name ctlflags ptr descr
.Fn SYSCTL_SBINTIME_USEC parent number name ctlflags ptr descr
.Fn SYSCTL_STRING parent number name ctlflags arg len descr
.Fn SYSCTL_CONST_STRING parent number name ctlflags arg descr
.Fn SYSCTL_STRUCT parent number name ctlflags ptr struct_type descr
.Fn SYSCTL_U8 parent number name ctlflags ptr val descr
.Fn SYSCTL_U16 parent number name ctlflags ptr val descr
@ -607,6 +620,11 @@ If the
.Fa len
argument in zero, the string length is computed at every access to the OID using
.Xr strlen 3 .
Use the
.Fn SYSCTL_CONST_STRING
macro or the
.Fn SYSCTL_ADD_CONST_STRING
function to add a sysctl for a constant string.
.Sh CREATING OPAQUE SYSCTLS
The
.Fn SYSCTL_OPAQUE
@ -658,6 +676,7 @@ Static sysctls are declared using one of the
.Fn SYSCTL_SBINTIME_MSEC ,
.Fn SYSCTL_SBINTIME_USEC ,
.Fn SYSCTL_STRING ,
.Fn SYSCTL_CONST_STRING ,
.Fn SYSCTL_STRUCT ,
.Fn SYSCTL_U8 ,
.Fn SYSCTL_U16 ,
@ -690,6 +709,7 @@ Dynamic nodes are created using one of the
.Fn SYSCTL_ADD_SBINTIME_MSEC ,
.Fn SYSCTL_ADD_SBINTIME_USEC ,
.Fn SYSCTL_ADD_STRING ,
.Fn SYSCTL_ADD_CONST_STRING ,
.Fn SYSCTL_ADD_STRUCT ,
.Fn SYSCTL_ADD_U8 ,
.Fn SYSCTL_ADD_U16 ,

4
sys/net/iflib.c
View File

@ -6257,8 +6257,8 @@ iflib_add_device_sysctl_pre(if_ctx_t ctx)
CTLFLAG_RD, NULL, "IFLIB fields");
oid_list = SYSCTL_CHILDREN(node);
SYSCTL_ADD_STRING(ctx_list, oid_list, OID_AUTO, "driver_version",
CTLFLAG_RD, ctx->ifc_sctx->isc_driver_version, 0,
SYSCTL_ADD_CONST_STRING(ctx_list, oid_list, OID_AUTO, "driver_version",
CTLFLAG_RD, ctx->ifc_sctx->isc_driver_version,
"driver version");
SYSCTL_ADD_U16(ctx_list, oid_list, OID_AUTO, "override_ntxqs",

2
sys/net/iflib.h
View File

@ -248,7 +248,7 @@ struct if_shared_ctx {
/* fields necessary for probe */
pci_vendor_info_t *isc_vendor_info;
char *isc_driver_version;
const char *isc_driver_version;
/* optional function to transform the read values to match the table*/
void (*isc_parse_devinfo) (uint16_t *device_id, uint16_t *subvendor_id,
uint16_t *subdevice_id, uint16_t *rev_id);

19
sys/sys/sysctl.h
View File

@ -354,6 +354,25 @@ TAILQ_HEAD(sysctl_ctx_list, sysctl_ctx_entry);
NULL); \
})
/* Oid for a constant '\0' terminated string. */
#define SYSCTL_CONST_STRING(parent, nbr, name, access, arg, descr) \
SYSCTL_OID(parent, nbr, name, CTLTYPE_STRING|(access), \
__DECONST(char *, arg), 0, sysctl_handle_string, "A", descr); \
CTASSERT(!(access & CTLFLAG_WR)); \
CTASSERT(((access) & CTLTYPE) == 0 || \
((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_STRING)
#define SYSCTL_ADD_CONST_STRING(ctx, parent, nbr, name, access, arg, descr) \
({ \
char *__arg = __DECONST(char *, arg); \
CTASSERT(!(access & CTLFLAG_WR)); \
CTASSERT(((access) & CTLTYPE) == 0 || \
((access) & SYSCTL_CT_ASSERT_MASK) == CTLTYPE_STRING); \
sysctl_add_oid(ctx, parent, nbr, name, CTLTYPE_STRING|(access), \
__arg, 0, sysctl_handle_string, "A", __DESCR(descr), \
NULL); \
})
/* Oid for a bool. If ptr is NULL, val is returned. */
#define SYSCTL_NULL_BOOL_PTR ((bool *)NULL)
#define SYSCTL_BOOL(parent, nbr, name, access, ptr, val, descr) \