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From: Chenbo Xia <chenbo.xia@intel.com>
To: dev@dpdk.org, thomas@monjalon.net, cunming.liang@intel.com,
jingjing.wu@intel.com
Cc: anatoly.burakov@intel.com, ferruh.yigit@intel.com, mdr@ashroe.eu,
nhorman@tuxdriver.com, bruce.richardson@intel.com,
david.marchand@redhat.com, stephen@networkplumber.org,
konstantin.ananyev@intel.com, Tiwei Bie <tiwei.bie@intel.com>
Date: Tue, 1 Jun 2021 11:06:42 +0800
Message-Id: <20210601030644.3318-5-chenbo.xia@intel.com>
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<20210601030644.3318-1-chenbo.xia@intel.com>
Subject: [dpdk-dev] [RFC v3 4/6] eal: add a helper for reading string from
sysfs
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From: Tiwei Bie <tiwei.bie@intel.com>
This patch adds a helper for reading string from sysfs.
Signed-off-by: Cunming Liang <cunming.liang@intel.com>
Signed-off-by: Tiwei Bie <tiwei.bie@intel.com>
---
lib/eal/common/eal_filesystem.h | 10 ++++++++++
lib/eal/freebsd/eal.c | 22 ++++++++++++++++++++++
lib/eal/linux/eal.c | 22 ++++++++++++++++++++++
lib/eal/version.map | 3 +++
4 files changed, 57 insertions(+)
diff --git a/lib/eal/common/eal_filesystem.h b/lib/eal/common/eal_filesystem.h
index 5d21f07c20..be4c51ebb2 100644
--- a/lib/eal/common/eal_filesystem.h
+++ b/lib/eal/common/eal_filesystem.h
@@ -104,4 +104,14 @@ eal_get_hugefile_path(char *buffer, size_t buflen, const char *hugedir, int f_id
* Used to read information from files on /sys */
int eal_parse_sysfs_value(const char *filename, unsigned long *val);
+/**
+ * @warning
+ * @b EXPERIMENTAL: this API may change without prior notice
+ *
+ * Function to read a line from a file on the filesystem.
+ * Used to read information from files on /sys
+ */
+__rte_experimental
+int rte_eal_parse_sysfs_str(const char *filename, char *buf, unsigned long sz);
+
#endif /* EAL_FILESYSTEM_H */
diff --git a/lib/eal/freebsd/eal.c b/lib/eal/freebsd/eal.c
index f4d1676754..002f07f4da 100644
--- a/lib/eal/freebsd/eal.c
+++ b/lib/eal/freebsd/eal.c
@@ -169,6 +169,28 @@ eal_parse_sysfs_value(const char *filename, unsigned long *val)
return 0;
}
+int
+rte_eal_parse_sysfs_str(const char *filename, char *buf, unsigned long sz)
+{
+ FILE *f;
+
+ f = fopen(filename, "r");
+ if (f == NULL) {
+ RTE_LOG(ERR, EAL, "%s(): cannot open sysfs file %s\n",
+ __func__, filename);
+ return -1;
+ }
+
+ if (fgets(buf, sz, f) == NULL) {
+ RTE_LOG(ERR, EAL, "%s(): cannot read sysfs file %s\n",
+ __func__, filename);
+ fclose(f);
+ return -1;
+ }
+
+ fclose(f);
+ return 0;
+}
/* create memory configuration in shared/mmap memory. Take out
* a write lock on the memsegs, so we can auto-detect primary/secondary.
diff --git a/lib/eal/linux/eal.c b/lib/eal/linux/eal.c
index ba19fc6347..d5917a48ca 100644
--- a/lib/eal/linux/eal.c
+++ b/lib/eal/linux/eal.c
@@ -260,6 +260,28 @@ eal_parse_sysfs_value(const char *filename, unsigned long *val)
return 0;
}
+int
+rte_eal_parse_sysfs_str(const char *filename, char *buf, unsigned long sz)
+{
+ FILE *f;
+
+ f = fopen(filename, "r");
+ if (f == NULL) {
+ RTE_LOG(ERR, EAL, "%s(): cannot open sysfs file %s\n",
+ __func__, filename);
+ return -1;
+ }
+
+ if (fgets(buf, sz, f) == NULL) {
+ RTE_LOG(ERR, EAL, "%s(): cannot read sysfs file %s\n",
+ __func__, filename);
+ fclose(f);
+ return -1;
+ }
+
+ fclose(f);
+ return 0;
+}
/* create memory configuration in shared/mmap memory. Take out
* a write lock on the memsegs, so we can auto-detect primary/secondary.
diff --git a/lib/eal/version.map b/lib/eal/version.map
index fe5c3dac98..3d7fce26a4 100644
--- a/lib/eal/version.map
+++ b/lib/eal/version.map
@@ -423,6 +423,9 @@ EXPERIMENTAL {
rte_version_release; # WINDOWS_NO_EXPORT
rte_version_suffix; # WINDOWS_NO_EXPORT
rte_version_year; # WINDOWS_NO_EXPORT
+
+ # added in 21.08
+ rte_eal_parse_sysfs_str; # WINDOWS_NO_EXPORT
};
INTERNAL {
--
2.17.1