This patch adds a max SIMD bitwidth EAL configuration. The API allows
for an app to set this value. It can also be set using EAL argument
--force-max-simd-bitwidth, which will lock the value and override any
modifications made by the app.
Signed-off-by: Ciara Power <ciara.po...@intel.com>
---
lib/librte_eal/common/eal_common_options.c | 60 ++++++++++++++++++++++
lib/librte_eal/common/eal_internal_cfg.h | 8 +++
lib/librte_eal/common/eal_options.h | 2 +
lib/librte_eal/include/rte_eal.h | 31 +++++++++++
lib/librte_eal/rte_eal_version.map | 4 ++
5 files changed, 105 insertions(+)
diff --git a/lib/librte_eal/common/eal_common_options.c
b/lib/librte_eal/common/eal_common_options.c
index a5426e1234..90f4e8f5c3 100644
--- a/lib/librte_eal/common/eal_common_options.c
+++ b/lib/librte_eal/common/eal_common_options.c
@@ -102,6 +102,7 @@ eal_long_options[] = {
{OPT_MATCH_ALLOCATIONS, 0, NULL, OPT_MATCH_ALLOCATIONS_NUM},
{OPT_TELEMETRY, 0, NULL, OPT_TELEMETRY_NUM },
{OPT_NO_TELEMETRY, 0, NULL, OPT_NO_TELEMETRY_NUM },
+ {OPT_FORCE_MAX_SIMD_BITWIDTH, 1, NULL, OPT_FORCE_MAX_SIMD_BITWIDTH_NUM},
{0, 0, NULL, 0 }
};
@@ -1309,6 +1310,32 @@ eal_parse_iova_mode(const char *name)
return 0;
}
+static int
+eal_parse_simd_bitwidth(const char *arg, bool locked)
+{
+ char *end;
+ uint16_t bitwidth;
+ int ret;
+ struct internal_config *internal_conf =
+ eal_get_internal_configuration();
+
+ if (arg == NULL || arg[0] == '\0')
+ return -1;
+
+ errno = 0;
+ bitwidth = strtoul(arg, &end, 0);
+
+ /* check for errors */
+ if ((errno != 0) || end == NULL || (*end != '\0'))
+ return -1;
+
+ ret = rte_set_max_simd_bitwidth(bitwidth);
+ if (ret < 0)
+ return -1;
+ internal_conf->max_simd_bitwidth.locked = locked;
+ return 0;
+}
+
static int
eal_parse_base_virtaddr(const char *arg)
{
@@ -1707,6 +1734,13 @@ eal_parse_common_option(int opt, const char *optarg,
case OPT_NO_TELEMETRY_NUM:
conf->no_telemetry = 1;
break;
+ case OPT_FORCE_MAX_SIMD_BITWIDTH_NUM:
+ if (eal_parse_simd_bitwidth(optarg, 1) < 0) {
+ RTE_LOG(ERR, EAL, "invalid parameter for --"
+ OPT_FORCE_MAX_SIMD_BITWIDTH "\n");
+ return -1;
+ }
+ break;
/* don't know what to do, leave this to caller */
default:
@@ -1903,6 +1937,31 @@ eal_check_common_options(struct internal_config
*internal_cfg)
return 0;
}
+uint16_t
+rte_get_max_simd_bitwidth(void)
+{
+ const struct internal_config *internal_conf =
+ eal_get_internal_configuration();
+ return internal_conf->max_simd_bitwidth.bitwidth;
+}
+
+int
+rte_set_max_simd_bitwidth(uint16_t bitwidth)
+{
+ struct internal_config *internal_conf =
+ eal_get_internal_configuration();
+ if (internal_conf->max_simd_bitwidth.locked) {
+ RTE_LOG(NOTICE, EAL, "Cannot set max SIMD bitwidth - user
runtime override enabled");
+ return -EPERM;
+ }
+ if (bitwidth < RTE_NO_SIMD || !rte_is_power_of_2(bitwidth)) {
+ RTE_LOG(ERR, EAL, "Invalid bitwidth value!\n");
+ return -EINVAL;
+ }
+ internal_conf->max_simd_bitwidth.bitwidth = bitwidth;
+ return 0;
+}
+
void
eal_common_usage(void)
{
@@ -1981,6 +2040,7 @@ eal_common_usage(void)
" --"OPT_BASE_VIRTADDR" Base virtual address\n"
" --"OPT_TELEMETRY" Enable telemetry support (on by
default)\n"
" --"OPT_NO_TELEMETRY" Disable telemetry support\n"
+ " --"OPT_FORCE_MAX_SIMD_BITWIDTH" Force the max SIMD bitwidth\n"
"\nEAL options for DEBUG use only:\n"
" --"OPT_HUGE_UNLINK" Unlink hugepage files after init\n"
" --"OPT_NO_HUGE" Use malloc instead of hugetlbfs\n"
diff --git a/lib/librte_eal/common/eal_internal_cfg.h
b/lib/librte_eal/common/eal_internal_cfg.h
index 13f93388a7..367e0cc19e 100644
--- a/lib/librte_eal/common/eal_internal_cfg.h
+++ b/lib/librte_eal/common/eal_internal_cfg.h
@@ -33,6 +33,12 @@ struct hugepage_info {
int lock_descriptor; /**< file descriptor for hugepage dir */
};
+struct simd_bitwidth {
+ /**< flag indicating if bitwidth is locked from further modification */
+ bool locked;
+ uint16_t bitwidth; /**< bitwidth value */
+};
+
/**
* internal configuration
*/
@@ -85,6 +91,8 @@ struct internal_config {
volatile unsigned int init_complete;
/**< indicates whether EAL has completed initialization */
unsigned int no_telemetry; /**< true to disable Telemetry */
+ /** max simd bitwidth path to use */
+ struct simd_bitwidth max_simd_bitwidth;
};
void eal_reset_internal_config(struct internal_config *internal_cfg);
diff --git a/lib/librte_eal/common/eal_options.h
b/lib/librte_eal/common/eal_options.h
index 89769d48b4..ef33979664 100644
--- a/lib/librte_eal/common/eal_options.h
+++ b/lib/librte_eal/common/eal_options.h
@@ -85,6 +85,8 @@ enum {
OPT_TELEMETRY_NUM,
#define OPT_NO_TELEMETRY "no-telemetry"
OPT_NO_TELEMETRY_NUM,
+#define OPT_FORCE_MAX_SIMD_BITWIDTH "force-max-simd-bitwidth"
+ OPT_FORCE_MAX_SIMD_BITWIDTH_NUM,
OPT_LONG_MAX_NUM
};
diff --git a/lib/librte_eal/include/rte_eal.h b/lib/librte_eal/include/rte_eal.h
index ddcf6a2e7a..14048fdb74 100644
--- a/lib/librte_eal/include/rte_eal.h
+++ b/lib/librte_eal/include/rte_eal.h
@@ -43,6 +43,13 @@ enum rte_proc_type_t {
RTE_PROC_INVALID
};
+enum rte_max_simd_t {
+ RTE_NO_SIMD = 64,
+ RTE_MAX_128_SIMD = 128,
+ RTE_MAX_256_SIMD = 256,
+ RTE_MAX_512_SIMD = 512
+};
+
/**
* Get the process type in a multi-process setup
*
@@ -51,6 +58,30 @@ enum rte_proc_type_t {
*/
enum rte_proc_type_t rte_eal_process_type(void);
+/**
+ * Get the supported SIMD bitwidth.
+ *
+ * @return
+ * uint16_t bitwidth.
+ */
+__rte_experimental
+uint16_t rte_get_max_simd_bitwidth(void);
+
+/**
+ * Set the supported SIMD bitwidth.
+ *
+ * @param bitwidth
+ * uint16_t bitwidth.
+ * @return
+ * 0 on success.
+ * @return
+ * -EINVAL on invalid bitwidth parameter.
+ * @return
+ * -EPERM if bitwidth is locked.
+ */
+__rte_experimental
+int rte_set_max_simd_bitwidth(uint16_t bitwidth);
+
/**
* Request iopl privilege for all RPL.
*
diff --git a/lib/librte_eal/rte_eal_version.map
b/lib/librte_eal/rte_eal_version.map
index bf0c17c233..8059ea76b6 100644
--- a/lib/librte_eal/rte_eal_version.map
+++ b/lib/librte_eal/rte_eal_version.map
@@ -403,6 +403,10 @@ EXPERIMENTAL {
rte_mp_disable;
rte_thread_register;
rte_thread_unregister;
+
+ # added in 20.11
+ rte_get_max_simd_bitwidth;
+ rte_set_max_simd_bitwidth;
};
INTERNAL {
--
2.17.1
