[dpdk-dev] [RFC 2/2] nfp: allow for non-root user

Aaron Conole aconole at redhat.com
Fri Apr 13 00:22:08 CEST 2018


Currently, the nfp lock files are taken from the global lock file
location, which will work when the user is running as root.  However,
some distributions and applications (notably ovs 2.8+ on RHEL/Fedora)
run as a non-root user.

Signed-off-by: Aaron Conole <aconole at redhat.com>
---
 drivers/net/nfp/nfp_nfpu.c | 23 ++++++++++++++++++-----
 1 file changed, 18 insertions(+), 5 deletions(-)

diff --git a/drivers/net/nfp/nfp_nfpu.c b/drivers/net/nfp/nfp_nfpu.c
index 2ed985ff4..ae2e07220 100644
--- a/drivers/net/nfp/nfp_nfpu.c
+++ b/drivers/net/nfp/nfp_nfpu.c
@@ -18,6 +18,22 @@
 #define NFP_CFG_EXP_BAR         7
 
 #define NFP_CFG_EXP_BAR_CFG_BASE	0x30000
+#define NFP_LOCKFILE_PATH_FMT "%s/nfp%d"
+
+/* get nfp lock file path (/var/lock if root, $HOME otherwise) */
+static void
+nspu_get_lockfile_path(char *buffer, int bufsz, nfpu_desc_t *desc)
+{
+	const char *dir = "/var/lock";
+	const char *home_dir = getenv("HOME");
+
+	if (getuid() != 0 && home_dir != NULL)
+		dir = home_dir;
+
+	/* use current prefix as file path */
+	snprintf(buffer, bufsz, NFP_LOCKFILE_PATH_FMT, dir,
+			desc->nfp);
+}
 
 /* There could be other NFP userspace tools using the NSP interface.
  * Make sure there is no other process using it and locking the access for
@@ -30,9 +46,7 @@ nspv_aquire_process_lock(nfpu_desc_t *desc)
 	struct flock lock;
 	char lockname[30];
 
-	memset(&lock, 0, sizeof(lock));
-
-	snprintf(lockname, sizeof(lockname), "/var/lock/nfp%d", desc->nfp);
+	nspu_get_lockfile_path(lockname, sizeof(lockname), desc);
 
 	/* Using S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH */
 	desc->lock = open(lockname, O_RDWR | O_CREAT, 0666);
@@ -106,7 +120,6 @@ nfpu_close(nfpu_desc_t *desc)
 	rte_free(desc->nspu);
 	close(desc->lock);
 
-	snprintf(lockname, sizeof(lockname), "/var/lock/nfp%d", desc->nfp);
-	unlink(lockname);
+	nspu_get_lockfile_path(lockname, sizeof(lockname), desc);
 	return 0;
 }
-- 
2.14.3



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