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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>
Subject: [dpdk-dev] [RFC v3 4/6] eal: add a helper for reading string from sysfs
Date: Tue,  1 Jun 2021 11:06:42 +0800
Message-ID: <20210601030644.3318-5-chenbo.xia@intel.com> (raw)
In-Reply-To: <20210601030644.3318-1-chenbo.xia@intel.com>

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


  parent reply	other threads:[~2021-06-01  3:18 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-03  7:18 [dpdk-dev] [RFC 0/3] Add mdev (Mediated device) support in DPDK Tiwei Bie
2019-04-03  7:18 ` Tiwei Bie
2019-04-03  7:18 ` [dpdk-dev] [RFC 1/3] eal: add a helper for reading string from sysfs Tiwei Bie
2019-04-03  7:18   ` Tiwei Bie
2019-04-03  7:18 ` [dpdk-dev] [RFC 2/3] bus/mdev: add mdev bus support Tiwei Bie
2019-04-03  7:18   ` Tiwei Bie
2019-04-03  7:18 ` [dpdk-dev] [RFC 3/3] bus/pci: add mdev support Tiwei Bie
2019-04-03  7:18   ` Tiwei Bie
2019-04-03 14:13   ` Wiles, Keith
2019-04-03 14:13     ` Wiles, Keith
2019-04-04  4:19     ` Tiwei Bie
2019-04-04  4:19       ` Tiwei Bie
2019-04-08  8:44 ` [dpdk-dev] [RFC 0/3] Add mdev (Mediated device) support in DPDK Alejandro Lucero
2019-04-08  8:44   ` Alejandro Lucero
2019-04-08  9:36   ` Tiwei Bie
2019-04-08  9:36     ` Tiwei Bie
2019-04-10 10:02     ` Francois Ozog
2019-04-10 10:02       ` Francois Ozog
2019-07-15  7:52 ` [dpdk-dev] [RFC v2 0/5] " Tiwei Bie
2019-07-15  7:52   ` [dpdk-dev] [RFC v2 1/5] bus/pci: introduce an internal representation of PCI device Tiwei Bie
2019-07-15  7:52   ` [dpdk-dev] [RFC v2 2/5] bus/pci: avoid depending on private value in kernel source Tiwei Bie
2019-07-15  7:52   ` [dpdk-dev] [RFC v2 3/5] bus/pci: introduce helper for MMIO read and write Tiwei Bie
2019-07-15  7:52   ` [dpdk-dev] [RFC v2 4/5] eal: add a helper for reading string from sysfs Tiwei Bie
2019-07-15  7:52   ` [dpdk-dev] [RFC v2 5/5] bus/pci: add mdev support Tiwei Bie
2021-06-01  3:06     ` [dpdk-dev] [RFC v3 0/6] Add mdev (Mediated device) support in DPDK Chenbo Xia
2021-06-01  3:06       ` [dpdk-dev] [RFC v3 1/6] bus/pci: introduce an internal representation of PCI device Chenbo Xia
2021-06-01  3:06       ` [dpdk-dev] [RFC v3 2/6] bus/pci: avoid depending on private value in kernel source Chenbo Xia
2021-06-01  3:06       ` [dpdk-dev] [RFC v3 3/6] bus/pci: introduce helper for MMIO read and write Chenbo Xia
2021-06-01  3:06       ` Chenbo Xia [this message]
2021-06-01  5:37         ` [dpdk-dev] [RFC v3 4/6] eal: add a helper for reading string from sysfs Stephen Hemminger
2021-06-08  5:47           ` Xia, Chenbo
2021-06-01  5:39         ` Stephen Hemminger
2021-06-08  5:48           ` Xia, Chenbo
2021-06-11  7:19         ` Thomas Monjalon
2021-06-01  3:06       ` [dpdk-dev] [RFC v3 5/6] bus/pci: add mdev support Chenbo Xia
2021-06-01  3:06       ` [dpdk-dev] [RFC v3 6/6] bus/pci: add sparse mmap support for mediated PCI devices Chenbo Xia
2021-06-11  7:15       ` [dpdk-dev] [RFC v3 0/6] Add mdev (Mediated device) support in DPDK Thomas Monjalon
2021-06-15  2:49         ` Xia, Chenbo
2021-06-15  7:48           ` Thomas Monjalon
2021-06-15 10:44             ` Xia, Chenbo
2021-06-15 11:57             ` Jason Gunthorpe

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