vhost: add missing experimental flag

This function is listed under EXPERIMENTAL in the
rte_vhost_version.map, so it needs to be marked
with __rte_experimental in the header file as well.

Found by check-experimental-syms.sh when trying to compile
DPDK with -finstrument-functions.  This script didn't
catch this in the normal case, since the function is
declared __rte_always_inline.

This also requires updating the vhost_scsi example to allow
use of this newly marked experimental API.

Signed-off-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>

examples/vhost_scsi/Makefile

@@ -58,6 +58,7 @@ please change the definition of the RTE_TARGET environment variable)
 all:
 else
 
+CFLAGS += -DALLOW_EXPERIMENTAL_API
 CFLAGS += -D_FILE_OFFSET_BITS=64
 CFLAGS += -O2
 CFLAGS += $(WERROR_FLAGS)

examples/vhost_scsi/meson.build

@@ -15,6 +15,7 @@ if not cc.has_header('linux/virtio_scsi.h')
 endif
 
 deps += 'vhost'
+allow_experimental_apis = true
 sources = files(
 	'scsi.c', 'vhost_scsi.c'
 )

lib/librte_vhost/rte_vhost.h

@@ -233,6 +233,7 @@ rte_vhost_gpa_to_vva(struct rte_vhost_memory *mem, uint64_t gpa)
  * @return
  *  the host virtual address on success, 0 on failure
  */
+__rte_experimental
 static __rte_always_inline uint64_t
 rte_vhost_va_from_guest_pa(struct rte_vhost_memory *mem,
 						   uint64_t gpa, uint64_t *len)