[dpdk-dev] [PATCH v4 4/8] bus/dpaa: use warn instead of error to improve portability

[Natanael Copa <ncopa@alpinelinux.org>]

Fix build with musl libc by using warn(3) instead of using the GNU
specific error(3).

`error(0, errno, ...)` is identical to `warn(...)` so replace:

  error(0, ret, ...);

with the identical:

  errno = ret;
  warn(...);

We could have used the identical `warnx("...: %s", strerror(ret))` but
strerror(3) is not thread-safe and the strerror_r variant has two
incompatible versions, one GNU specific and one XSI-compliant. Avoid the
mess by letting `warn` use the thread-local errno.

This also fixes error message for kzmalloc failures which previously
would always have given "Unknown error -1", since that is what
strerror(-1) returns. Let 'warn' use the proper error message from errno
which is set by kzalloc.

Fixes: 9d32ef0f5d61 ("bus/dpaa: support creating dynamic HW portal")
Fixes: f09ede6c8fd1 ("bus/dpaa: add BMAN driver core")
Fixes: 5b22cf744689 ("bus/dpaa: introducing FMan configurations")
Cc: stable@dpdk.org

Signed-off-by: Natanael Copa <ncopa@alpinelinux.org>
---
 drivers/bus/dpaa/base/fman/netcfg_layer.c |  4 ++--
 drivers/bus/dpaa/base/qbman/bman_driver.c | 12 ++++++++----
 drivers/bus/dpaa/base/qbman/qman_driver.c | 15 ++++++++++-----
 3 files changed, 20 insertions(+), 11 deletions(-)

diff --git a/drivers/bus/dpaa/base/fman/netcfg_layer.c b/drivers/bus/dpaa/base/fman/netcfg_layer.c
index b7009f229..bcedbaf68 100644
--- a/drivers/bus/dpaa/base/fman/netcfg_layer.c
+++ b/drivers/bus/dpaa/base/fman/netcfg_layer.c
@@ -8,7 +8,7 @@
 #include <dpaa_of.h>
 #include <net/if.h>
 #include <sys/ioctl.h>
-#include <error.h>
+#include <err.h>
 #include <net/if_arp.h>
 #include <assert.h>
 #include <unistd.h>
@@ -90,7 +90,7 @@ netcfg_acquire(void)
 	 */
 	skfd = socket(AF_PACKET, SOCK_RAW, 0);
 	if (unlikely(skfd < 0)) {
-		error(0, errno, "%s(): open(SOCK_RAW)", __func__);
+		warn("%s(): open(SOCK_RAW)", __func__);
 		return NULL;
 	}
 
diff --git a/drivers/bus/dpaa/base/qbman/bman_driver.c b/drivers/bus/dpaa/base/qbman/bman_driver.c
index 750b756b9..8c9a98c48 100644
--- a/drivers/bus/dpaa/base/qbman/bman_driver.c
+++ b/drivers/bus/dpaa/base/qbman/bman_driver.c
@@ -40,7 +40,8 @@ static int fsl_bman_portal_init(uint32_t idx, int is_shared)
 	ret = pthread_getaffinity_np(pthread_self(), sizeof(cpu_set_t),
 				     &cpuset);
 	if (ret) {
-		error(0, ret, "pthread_getaffinity_np()");
+		errno = ret;
+		warn("pthread_getaffinity_np()");
 		return ret;
 	}
 	pcfg.cpu = -1;
@@ -60,7 +61,8 @@ static int fsl_bman_portal_init(uint32_t idx, int is_shared)
 	map.index = idx;
 	ret = process_portal_map(&map);
 	if (ret) {
-		error(0, ret, "process_portal_map()");
+		errno = ret;
+		warn("process_portal_map()");
 		return ret;
 	}
 	/* Make the portal's cache-[enabled|inhibited] regions */
@@ -104,8 +106,10 @@ static int fsl_bman_portal_finish(void)
 	cfg = bman_destroy_affine_portal();
 	DPAA_BUG_ON(cfg != &pcfg);
 	ret = process_portal_unmap(&map.addr);
-	if (ret)
-		error(0, ret, "process_portal_unmap()");
+	if (ret) {
+		errno = ret;
+		warn("process_portal_unmap()");
+	}
 	return ret;
 }
 
diff --git a/drivers/bus/dpaa/base/qbman/qman_driver.c b/drivers/bus/dpaa/base/qbman/qman_driver.c
index 6d9aaff16..4cff2c161 100644
--- a/drivers/bus/dpaa/base/qbman/qman_driver.c
+++ b/drivers/bus/dpaa/base/qbman/qman_driver.c
@@ -50,7 +50,8 @@ static int fsl_qman_portal_init(uint32_t index, int is_shared)
 	map.index = index;
 	ret = process_portal_map(&map);
 	if (ret) {
-		error(0, ret, "process_portal_map()");
+		errno = ret;
+		warn("process_portal_map()");
 		return ret;
 	}
 	qpcfg.channel = map.channel;
@@ -96,8 +97,10 @@ static int fsl_qman_portal_finish(void)
 	cfg = qman_destroy_affine_portal(NULL);
 	DPAA_BUG_ON(cfg != &qpcfg);
 	ret = process_portal_unmap(&map.addr);
-	if (ret)
-		error(0, ret, "process_portal_unmap()");
+	if (ret) {
+		errno = ret;
+		warn("process_portal_unmap()");
+	}
 	return ret;
 }
 
@@ -146,7 +149,8 @@ struct qman_portal *fsl_qman_fq_portal_create(int *fd)
 
 	q_pcfg = kzalloc((sizeof(struct qm_portal_config)), 0);
 	if (!q_pcfg) {
-		error(0, -1, "q_pcfg kzalloc failed");
+		/* kzalloc sets errno */
+		warn("q_pcfg kzalloc failed");
 		return NULL;
 	}
 
@@ -155,7 +159,8 @@ struct qman_portal *fsl_qman_fq_portal_create(int *fd)
 	q_map.index = QBMAN_ANY_PORTAL_IDX;
 	ret = process_portal_map(&q_map);
 	if (ret) {
-		error(0, ret, "process_portal_map()");
+		errno = ret;
+		warn("process_portal_map()");
 		kfree(q_pcfg);
 		return NULL;
 	}
-- 
2.29.2