config: disable armv8 crypto extension

Per armv8 crypto extension support, make build always enable it by default
as long as compiler supports the feature while meson build only enables it
for 'default' machine of generic armv8 architecture.

It is known that not all the armv8 platforms have the crypto extension. For
example, Mellanox BlueField has a variant which doesn't have it. If crypto
enabled binary runs on such a platform, rte_eal_init() fails.

'+crypto' flag currently implies only '+aes' and '+sha2' and enabling it
will generate the crypto instructions only when crypto intrinsics are used.
For the devices supporting 8.2 crypto or newer, compiler could generate
such instructions beyond intrinsics or asm code. For example, compiler can
generate 3-way exclusive OR instructions if sha3 is supported. However, it
has to be enabled by adding '+sha3' as of today.

In DPDK, armv8 cryptodev is the only one which requires the crypto support.
As it even uses external library of Marvell which is compiled out of DPDK
with crypto support and there's run-time check for required cpuflags,
crypto support can be disabled in DPDK.

Cc: stable@dpdk.org
Signed-off-by: Yongseok Koh <yskoh@mellanox.com>
Acked-by: Jerin Jacob <jerinj@marvell.com>
Tested-by: Dharmik Thakkar <dharmik.thakkar@arm.com>
Reviewed-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>

diff --git a/config/arm/meson.build b/config/arm/meson.build
index 7fa6ed3..abc8cf3 100644 (file)
--- a/config/arm/meson.build
+++ b/config/arm/meson.build
@@ -74,7 +74,7 @@ flags_octeontx2_extra = [
        ['RTE_USE_C11_MEM_MODEL', true]]
 
 machine_args_generic = [
-       ['default', ['-march=armv8-a+crc+crypto']],
+       ['default', ['-march=armv8-a+crc']],
        ['native', ['-march=native']],
        ['0xd03', ['-mcpu=cortex-a53']],
        ['0xd04', ['-mcpu=cortex-a35']],

diff --git a/doc/guides/rel_notes/release_19_08.rst b/doc/guides/rel_notes/release_19_08.rst
index a17e7de..c199270 100644 (file)
--- a/doc/guides/rel_notes/release_19_08.rst
+++ b/doc/guides/rel_notes/release_19_08.rst
@@ -69,6 +69,8 @@ Removed Items
 
 * Removed KNI ethtool, CONFIG_RTE_KNI_KMOD_ETHTOOL, support.
 
+* build: armv8 crypto extension is disabled.
+
 
 API Changes
 -----------

diff --git a/mk/machine/armv8a/rte.vars.mk b/mk/machine/armv8a/rte.vars.mk
index 8252efb..5e3ffc3 100644 (file)
--- a/mk/machine/armv8a/rte.vars.mk
+++ b/mk/machine/armv8a/rte.vars.mk
@@ -28,4 +28,4 @@
 # CPU_LDFLAGS =
 # CPU_ASFLAGS =
 
-MACHINE_CFLAGS += -march=armv8-a+crc+crypto
+MACHINE_CFLAGS += -march=armv8-a+crc