xnvme: update submodule to v0.5.0

This updates the xNVMe submodule to v0.5.0 and adjusts the Makefile,
disabling a backend (libvfn) introduced in v0.5.0 which is not of
interest.

With xNVMe v0.5.0 two things important for the bdev_xnvme has changed:

* The 'libaio' backend implementation responds to 'opts.poll_io'. It
  does so by 'xnvme_queue_poke()' returning immediatly instead of
  waiting for at least one outstanding IO to complete or for a timeout
  to occur. This dramatically improves the IO-rate and reduces latency.

* Prior to xNVMe v0.5.0, the liburing library was vendored and "bundled"
  into the xNVMe library. This library-bundling can cause linker issue
  and is thus replaced by linking "properly" with liburing on the system
  via pkg-config discovery.

  To make sure linker can properly link libxnvme.a's content we need to
  make sure we point at system's -luring during the build. Effectively,
  this can now work together with --with-uring[=/uring].

This change is made in preparation to adding the 'conserve_cpu' option
which makes use of 'opts.poll_io' for 'io_mechanism=libaio'.

Signed-off-by: Simon A. F. Lund <simon.lund@samsung.com>
Signed-off-by: Michal Berger <michal.berger@intel.com>
Change-Id: Ibd6e620679a3991a4a8642bb39390a61284aac74
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/14677
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Community-CI: Mellanox Build Bot

configure

@@ -1077,7 +1077,7 @@ elif [[ "${CONFIG[PGO_USE]}" = "y" ]]; then
 	fi
 fi
 
-if [[ "${CONFIG[URING]}" = "y" ]]; then
+if [[ "${CONFIG[URING]}" = "y" || "${CONFIG[XNVME]}" = "y" ]]; then
 	if [[ -n "${CONFIG[URING_PATH]}" ]]; then
 		check_dir "${CONFIG[URING_PATH]}"
 	elif ! echo -e '#include <liburing.h>\nint main(void) { return 0; }\n' \

mk/spdk.common.mk

@@ -220,6 +220,9 @@ XNVME_INCLUDE_DIR=$(XNVME_DIR)/include
 CFLAGS += -I$(XNVME_INCLUDE_DIR)
 LDFLAGS += -L$(XNVME_INSTALL_DIR)
 SYS_LIBS += -lxnvme
+ifneq ($(CONFIG_URING), y)
+SYS_LIBS += -luring
+endif
 endif
 
 ifeq ($(CONFIG_DAOS),y)

xnvme

@@ -1 +1 @@
-Subproject commit e507f2d1791163d0c2757f1b973cd2cf6dfcb573
+Subproject commit 59cca28a61ae3154ba1731ca2ee7daa402ec5e2e

xnvmebuild/Makefile

@@ -11,7 +11,11 @@ include $(SPDK_ROOT_DIR)/mk/spdk.common.mk
 all:
 	(cd $(SPDK_ROOT_DIR)/xnvme && \
 		export PKG_CONFIG_PATH=$$PKG_CONFIG_PATH:/usr/lib/pkgconfig:/usr/lib64/pkgconfig && \
-		meson setup builddir -Dwith-spdk=false -Dwith-fio=false -Dshared_library=false && \
+		meson setup builddir \
+		-Dwith-spdk=false \
+		-Dwith-fio=false \
+		-Dwith-libvfn=false \
+		-Dshared_library=false && \
 		meson compile -C builddir && \
 		cd -)