From: Michal Mazurek <m...@semihalf.com>
Add an implementation of the rte_lpm_lookupx4() function for platforms
without support for vector operations.
This will be useful in the upcoming RISC-V port as well as any platform
which may want to start with a basic level of LPM support.
Signed-off-by: Michal Mazurek <m...@semihalf.com>
Signed-off-by: Stanislaw Kardach <k...@semihalf.com>
---
doc/guides/rel_notes/release_22_07.rst | 5 ++++
lib/lpm/meson.build | 1 +
lib/lpm/rte_lpm.h | 4 ++-
lib/lpm/rte_lpm_scalar.h | 40 ++++++++++++++++++++++++++
4 files changed, 49 insertions(+), 1 deletion(-)
create mode 100644 lib/lpm/rte_lpm_scalar.h
diff --git a/doc/guides/rel_notes/release_22_07.rst
b/doc/guides/rel_notes/release_22_07.rst
index e49cacecef..0cf3f71269 100644
--- a/doc/guides/rel_notes/release_22_07.rst
+++ b/doc/guides/rel_notes/release_22_07.rst
@@ -104,6 +104,11 @@ New Features
* ``RTE_EVENT_QUEUE_ATTR_WEIGHT``
* ``RTE_EVENT_QUEUE_ATTR_AFFINITY``
+* **Added scalar version of the LPM library.**
+
+ * Added scalar implementation of ``rte_lpm_lookupx4``. This is a fall-back
+ implementation for platforms that don't support vector operations.
+
Removed Items
-------------
diff --git a/lib/lpm/meson.build b/lib/lpm/meson.build
index 78d91d3421..6b47361fce 100644
--- a/lib/lpm/meson.build
+++ b/lib/lpm/meson.build
@@ -14,6 +14,7 @@ headers = files('rte_lpm.h', 'rte_lpm6.h')
indirect_headers += files(
'rte_lpm_altivec.h',
'rte_lpm_neon.h',
+ 'rte_lpm_scalar.h',
'rte_lpm_sse.h',
'rte_lpm_sve.h',
)
diff --git a/lib/lpm/rte_lpm.h b/lib/lpm/rte_lpm.h
index 1cf863a146..4f38864fde 100644
--- a/lib/lpm/rte_lpm.h
+++ b/lib/lpm/rte_lpm.h
@@ -405,8 +405,10 @@ rte_lpm_lookupx4(const struct rte_lpm *lpm, xmm_t ip,
uint32_t hop[4],
#endif
#elif defined(RTE_ARCH_PPC_64)
#include "rte_lpm_altivec.h"
-#else
+#elif defined(RTE_ARCH_X86)
#include "rte_lpm_sse.h"
+#else
+#include "rte_lpm_scalar.h"
#endif
#ifdef __cplusplus
diff --git a/lib/lpm/rte_lpm_scalar.h b/lib/lpm/rte_lpm_scalar.h
new file mode 100644
index 0000000000..4ae1b6f0b8
--- /dev/null
+++ b/lib/lpm/rte_lpm_scalar.h
@@ -0,0 +1,40 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2022 StarFive
+ * Copyright(c) 2022 SiFive
+ * Copyright(c) 2022 Semihalf
+ */
+
+#ifndef _RTE_LPM_SCALAR_H_
+#define _RTE_LPM_SCALAR_H_
+
+#include <rte_branch_prediction.h>
+#include <rte_byteorder.h>
+#include <rte_common.h>
+#include <rte_vect.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+static inline void
+rte_lpm_lookupx4(const struct rte_lpm *lpm, xmm_t ip, uint32_t hop[4],
+ uint32_t defv)
+{
+ uint32_t nh;
+ int ret;
+
+ ret = rte_lpm_lookup(lpm, ((rte_xmm_t)ip).u32[0], &nh);
+ hop[0] = (ret == 0) ? nh : defv;
+ ret = rte_lpm_lookup(lpm, ((rte_xmm_t)ip).u32[1], &nh);
+ hop[1] = (ret == 0) ? nh : defv;
+ ret = rte_lpm_lookup(lpm, ((rte_xmm_t)ip).u32[2], &nh);
+ hop[2] = (ret == 0) ? nh : defv;
+ ret = rte_lpm_lookup(lpm, ((rte_xmm_t)ip).u32[3], &nh);
+ hop[3] = (ret == 0) ? nh : defv;
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _RTE_LPM_SCALAR_H_ */
--
2.30.2
