net/sfc: support aarch64 architecture

Enable the PMD build on aarch64.

Signed-off-by: Andrew Rybchenko <arybchenko@solarflare.com>
Reviewed-by: Andy Moreton <amoreton@xilinx.com>

config/arm/meson.build

@@ -22,7 +22,6 @@ flags_common_default = [
 	#	['RTE_ARM64_MEMCPY_STRICT_ALIGN', false],
 
 	['RTE_NET_FM10K', false],
-	['RTE_NET_SFC_EFX', false],
 	['RTE_NET_AVP', false],
 
 	['RTE_SCHED_VECTOR', false],

doc/guides/nics/features/sfc_efx.ini

@@ -40,4 +40,5 @@ Multiprocess aware   = Y
 BSD nic_uio          = Y
 Linux UIO            = Y
 Linux VFIO           = Y
+ARMv8                = Y
 x86-64               = Y

doc/guides/rel_notes/release_20_11.rst

@@ -206,6 +206,7 @@ New Features
   * Added SR-IOV PF support
   * Added Alveo SN1000 SmartNICs (EF100 architecture) support including
     flow API transfer rules for switch HW offload
+  * Added ARMv8 support
 
 * **Added Wangxun txgbe PMD.**
 

drivers/common/sfc_efx/efsys.h

@@ -39,8 +39,25 @@ extern "C" {
 
 #define EFSYS_HAS_UINT64 1
 #define EFSYS_USE_UINT64 1
+/*
+ * __SSE2__ is defined by a compiler if target architecture supports
+ * Streaming SIMD Extensions 2 (SSE2). __m128i is a data type used
+ * by the extension instructions.
+ */
+#if defined(__SSE2__)
 #define EFSYS_HAS_UINT128 1
 typedef __m128i efsys_uint128_t;
+/*
+ * __int128 and unsigned __int128 are compiler extensions (built-in types).
+ * __SIZEOF_INT128__ is defined by the compiler if these data types are
+ * available.
+ */
+#elif defined(__SIZEOF_INT128__)
+#define EFSYS_HAS_UINT128 1
+typedef unsigned __int128 efsys_uint128_t;
+#else
+#error Unsigned 128-bit width integers support is required
+#endif
 
 #if RTE_BYTE_ORDER == RTE_BIG_ENDIAN
 #define EFSYS_IS_BIG_ENDIAN 1

drivers/common/sfc_efx/meson.build

@@ -5,9 +5,9 @@
 # This software was jointly developed between OKTET Labs (under contract
 # for Solarflare) and Solarflare Communications, Inc.
 
-if arch_subdir != 'x86' or not dpdk_conf.get('RTE_ARCH_64')
+if (arch_subdir != 'x86' or not dpdk_conf.get('RTE_ARCH_64')) and (arch_subdir != 'arm' or not host_machine.cpu_family().startswith('aarch64'))
 	build = false
-	reason = 'only supported on x86_64'
+	reason = 'only supported on x86_64 and aarch64'
 endif
 
 extra_flags = []

drivers/net/sfc/meson.build

@@ -6,9 +6,9 @@
 # This software was jointly developed between OKTET Labs (under contract
 # for Solarflare) and Solarflare Communications, Inc.
 
-if arch_subdir != 'x86' or not dpdk_conf.get('RTE_ARCH_64')
+if (arch_subdir != 'x86' or not dpdk_conf.get('RTE_ARCH_64')) and (arch_subdir != 'arm' or not host_machine.cpu_family().startswith('aarch64'))
 	build = false
-	reason = 'only supported on x86_64'
+	reason = 'only supported on x86_64 and aarch64'
 endif
 
 extra_flags = []

drivers/net/sfc/sfc_ef10.h

@@ -22,6 +22,15 @@ extern "C" {
 
 #define SFC_EF10_EV_QCLEAR_MASK		(~(SFC_EF10_EV_PER_CACHE_LINE - 1))
 
+/*
+ * Use simple libefx-based implementation of the
+ * sfc_ef10_ev_qclear_cache_line() if SSE2 is not available
+ * since optimized implementation uses __m128i intrinsics.
+ */
+#ifndef __SSE2__
+#define SFC_EF10_EV_QCLEAR_USE_EFX
+#endif
+
 #if defined(SFC_EF10_EV_QCLEAR_USE_EFX)
 static inline void
 sfc_ef10_ev_qclear_cache_line(void *ptr)