[dpdk-dev] [RFC v2 09/23] eal: add "legacy memory" option

Anatoly Burakov anatoly.burakov at intel.com
Tue Dec 19 12:14:36 CET 2017


This adds a "--legacy-mem" command-line switch. It will be used to
go back to the old memory behavior, one where we can't dynamically
allocate/free memory (the downside), but one where the user can
get physically contiguous memory, like before (the upside).

For now, nothing but the legacy behavior exists, non-legacy
memory init sequence will be added later.

Signed-off-by: Anatoly Burakov <anatoly.burakov at intel.com>
---
 lib/librte_eal/common/eal_common_options.c |  4 ++++
 lib/librte_eal/common/eal_internal_cfg.h   |  3 +++
 lib/librte_eal/common/eal_options.h        |  2 ++
 lib/librte_eal/linuxapp/eal/eal.c          |  1 +
 lib/librte_eal/linuxapp/eal/eal_memory.c   | 22 ++++++++++++++++++----
 5 files changed, 28 insertions(+), 4 deletions(-)

diff --git a/lib/librte_eal/common/eal_common_options.c b/lib/librte_eal/common/eal_common_options.c
index c3f7c41..88ff35a 100644
--- a/lib/librte_eal/common/eal_common_options.c
+++ b/lib/librte_eal/common/eal_common_options.c
@@ -99,6 +99,7 @@ eal_long_options[] = {
 	{OPT_VFIO_INTR,         1, NULL, OPT_VFIO_INTR_NUM        },
 	{OPT_VMWARE_TSC_MAP,    0, NULL, OPT_VMWARE_TSC_MAP_NUM   },
 	{OPT_SINGLE_FILE_SEGMENTS, 0, NULL, OPT_SINGLE_FILE_SEGMENTS_NUM},
+	{OPT_LEGACY_MEM,        0, NULL, OPT_LEGACY_MEM_NUM       },
 	{0,                     0, NULL, 0                        }
 };
 
@@ -1162,6 +1163,9 @@ eal_parse_common_option(int opt, const char *optarg,
 	case OPT_SINGLE_FILE_SEGMENTS_NUM:
 		conf->single_file_segments = 1;
 		break;
+	case OPT_LEGACY_MEM_NUM:
+		conf->legacy_mem = 1;
+		break;
 
 	/* don't know what to do, leave this to caller */
 	default:
diff --git a/lib/librte_eal/common/eal_internal_cfg.h b/lib/librte_eal/common/eal_internal_cfg.h
index 484a32e..62ab15b 100644
--- a/lib/librte_eal/common/eal_internal_cfg.h
+++ b/lib/librte_eal/common/eal_internal_cfg.h
@@ -79,6 +79,9 @@ struct internal_config {
 	volatile unsigned single_file_segments;
 	/**< true if storing all pages within single files (per-page-size,
 	 * per-node). */
+	volatile unsigned legacy_mem;
+	/**< true to enable legacy memory behavior (no dynamic allocation,
+	 * contiguous segments). */
 	volatile int syslog_facility;	  /**< facility passed to openlog() */
 	/** default interrupt mode for VFIO */
 	volatile enum rte_intr_mode vfio_intr_mode;
diff --git a/lib/librte_eal/common/eal_options.h b/lib/librte_eal/common/eal_options.h
index 26a682a..d09b034 100644
--- a/lib/librte_eal/common/eal_options.h
+++ b/lib/librte_eal/common/eal_options.h
@@ -85,6 +85,8 @@ enum {
 	OPT_VMWARE_TSC_MAP_NUM,
 #define OPT_SINGLE_FILE_SEGMENTS    "single-file-segments"
 	OPT_SINGLE_FILE_SEGMENTS_NUM,
+#define OPT_LEGACY_MEM    "legacy-mem"
+	OPT_LEGACY_MEM_NUM,
 	OPT_LONG_MAX_NUM
 };
 
diff --git a/lib/librte_eal/linuxapp/eal/eal.c b/lib/librte_eal/linuxapp/eal/eal.c
index 2a3127f..37ae8e0 100644
--- a/lib/librte_eal/linuxapp/eal/eal.c
+++ b/lib/librte_eal/linuxapp/eal/eal.c
@@ -367,6 +367,7 @@ eal_usage(const char *prgname)
 	       "  --"OPT_CREATE_UIO_DEV"    Create /dev/uioX (usually done by hotplug)\n"
 	       "  --"OPT_VFIO_INTR"         Interrupt mode for VFIO (legacy|msi|msix)\n"
 	       "  --"OPT_SINGLE_FILE_SEGMENTS" Put all hugepage memory in single files\n"
+	       "  --"OPT_LEGACY_MEM"        Legacy memory mode (no dynamic allocation, contiguous segments)\n"
 	       "\n");
 	/* Allow the application to print its usage message too if hook is set */
 	if ( rte_application_usage_hook ) {
diff --git a/lib/librte_eal/linuxapp/eal/eal_memory.c b/lib/librte_eal/linuxapp/eal/eal_memory.c
index dd18d98..5b18af9 100644
--- a/lib/librte_eal/linuxapp/eal/eal_memory.c
+++ b/lib/librte_eal/linuxapp/eal/eal_memory.c
@@ -940,8 +940,8 @@ huge_recover_sigbus(void)
  *  6. unmap the first mapping
  *  7. fill memsegs in configuration with contiguous zones
  */
-int
-rte_eal_hugepage_init(void)
+static int
+eal_legacy_hugepage_init(void)
 {
 	struct rte_mem_config *mcfg;
 	struct hugepage_file *hugepage = NULL, *tmp_hp = NULL;
@@ -1283,8 +1283,8 @@ getFileSize(int fd)
  * configuration and finds the hugepages which form that segment, mapping them
  * in order to form a contiguous block in the virtual memory space
  */
-int
-rte_eal_hugepage_attach(void)
+static int
+eal_legacy_hugepage_attach(void)
 {
 	const struct rte_mem_config *mcfg = rte_eal_get_configuration()->mem_config;
 	struct hugepage_file *hp = NULL;
@@ -1435,6 +1435,20 @@ rte_eal_hugepage_attach(void)
 }
 
 int
+rte_eal_hugepage_init(void) {
+	if (internal_config.legacy_mem)
+		return eal_legacy_hugepage_init();
+	return -1;
+}
+
+int
+rte_eal_hugepage_attach(void) {
+	if (internal_config.legacy_mem)
+		return eal_legacy_hugepage_attach();
+	return -1;
+}
+
+int
 rte_eal_using_phys_addrs(void)
 {
 	return phys_addrs_available;
-- 
2.7.4



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