From: Andrii Nakryiko <andrii@kernel.org>
Date: Wed, 3 Nov 2021 15:08:35 -0700
Subject: libbpf: Pass number of prog load attempts explicitly
Patch-mainline: v5.17-rc1
Git-commit: 45493cbaf59e3c9482e0e6a2646b362fff45db8b
References: jsc#PED-1368

Allow to control number of BPF_PROG_LOAD attempts from outside the
sys_bpf_prog_load() helper.

Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Dave Marchevsky <davemarchevsky@fb.com>
Link: https://lore.kernel.org/bpf/20211103220845.2676888-3-andrii@kernel.org
Acked-by: Shung-Hsi Yu <shung-hsi.yu@suse.com>
---
 tools/lib/bpf/bpf.c |   15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

--- a/tools/lib/bpf/bpf.c
+++ b/tools/lib/bpf/bpf.c
@@ -74,14 +74,15 @@ static inline int sys_bpf_fd(enum bpf_cm
 	return ensure_good_fd(fd);
 }
 
-static inline int sys_bpf_prog_load(union bpf_attr *attr, unsigned int size)
+#define PROG_LOAD_ATTEMPTS 5
+
+static inline int sys_bpf_prog_load(union bpf_attr *attr, unsigned int size, int attempts)
 {
-	int retries = 5;
 	int fd;
 
 	do {
 		fd = sys_bpf_fd(BPF_PROG_LOAD, attr, size);
-	} while (fd < 0 && errno == EAGAIN && retries-- > 0);
+	} while (fd < 0 && errno == EAGAIN && --attempts > 0);
 
 	return fd;
 }
@@ -304,7 +305,7 @@ int libbpf__bpf_prog_load(const struct b
 		memcpy(attr.prog_name, load_attr->name,
 		       min(strlen(load_attr->name), (size_t)BPF_OBJ_NAME_LEN - 1));
 
-	fd = sys_bpf_prog_load(&attr, sizeof(attr));
+	fd = sys_bpf_prog_load(&attr, sizeof(attr), PROG_LOAD_ATTEMPTS);
 	if (fd >= 0)
 		return fd;
 
@@ -345,7 +346,7 @@ int libbpf__bpf_prog_load(const struct b
 			break;
 		}
 
-		fd = sys_bpf_prog_load(&attr, sizeof(attr));
+		fd = sys_bpf_prog_load(&attr, sizeof(attr), PROG_LOAD_ATTEMPTS);
 		if (fd >= 0)
 			goto done;
 	}
@@ -359,7 +360,7 @@ int libbpf__bpf_prog_load(const struct b
 	attr.log_level = 1;
 	load_attr->log_buf[0] = 0;
 
-	fd = sys_bpf_prog_load(&attr, sizeof(attr));
+	fd = sys_bpf_prog_load(&attr, sizeof(attr), PROG_LOAD_ATTEMPTS);
 done:
 	/* free() doesn't affect errno, so we don't need to restore it */
 	free(finfo);
@@ -449,7 +450,7 @@ int bpf_verify_program(enum bpf_prog_typ
 	attr.kern_version = kern_version;
 	attr.prog_flags = prog_flags;
 
-	fd = sys_bpf_prog_load(&attr, sizeof(attr));
+	fd = sys_bpf_prog_load(&attr, sizeof(attr), PROG_LOAD_ATTEMPTS);
 	return libbpf_err_errno(fd);
 }