[Accel-config] [PATCH] accel-config: Add API to return uacce device path

From: Ramesh Thomas <ramesh.thomas(a)intel.com>

Return path to uacce device path for user wqs. This includes support for
legacy mode device names.

Signed-off-by: Ramesh Thomas <ramesh.thomas(a)intel.com>
---
 accfg/lib/libaccel-config.sym |  5 ++++
 accfg/lib/libaccfg.c          | 55 +++++++++++++++++++++++++++++++++++
 accfg/libaccel_config.h       |  1 +
 3 files changed, 61 insertions(+)

diff --git a/accfg/lib/libaccel-config.sym b/accfg/lib/libaccel-config.sym
index 4de2a49..a28ac97 100644
--- a/accfg/lib/libaccel-config.sym
+++ b/accfg/lib/libaccel-config.sym
@@ -141,3 +141,8 @@ global:
 	accfg_remove_mdev;
 	accfg_device_get_mdev_enabled;
 } LIBACCFG_6;
+
+LIBACCFG_8 {
+global:
+	accfg_wq_get_uacce_path;
+} LIBACCFG_7;
diff --git a/accfg/lib/libaccfg.c b/accfg/lib/libaccfg.c
index 1d89d4c..dd0219c 100644
--- a/accfg/lib/libaccfg.c
+++ b/accfg/lib/libaccfg.c
@@ -25,6 +25,7 @@
 #include <ccan/build_assert/build_assert.h>
 #include <util/sysfs.h>
 #include <accfg/libaccel_config.h>
+#include <fnmatch.h>
 #include "private.h"
 
 #define MDEV_POSTFIX "mdev_supported_types"
@@ -2099,6 +2100,60 @@ ACCFG_EXPORT int accfg_wq_size_boundary(struct accfg_device *device,
 	return 0;
 }
 
+ACCFG_EXPORT int accfg_wq_get_uacce_path(struct accfg_wq *wq, char *buf,
+		size_t size)
+{
+	struct dirent **d;
+	int n, n1;
+	char *f;
+	char p[PATH_MAX];
+	struct accfg_ctx *ctx;
+	int rc = 0;
+
+	ctx = accfg_device_get_ctx(wq->device);
+
+	sprintf(p, "/dev/%s", wq->device->bus_type_str);
+	n1 = n = scandir(p, &d, NULL, alphasort);
+	if (n < 0) {
+		err(ctx, "UACCE device path not found %s\n", p);
+		return -ENOENT;
+	}
+
+	sprintf(p, "%s-*", accfg_wq_get_devname(wq));
+
+	while (n--) {
+		f = &d[n]->d_name[0];
+
+		if (!fnmatch(p, f, 0) || !strcmp(accfg_wq_get_devname(wq), f))
+			break;
+	}
+
+	if (n < 0) {
+		err(ctx, "UACCE device for %s not found at /dev/%s\n",
+				accfg_wq_get_devname(wq),
+				wq->device->bus_type_str);
+		rc = -ENOENT;
+		goto ext_uacce;
+	}
+
+	n = sprintf(p, "/dev/%s/%s", wq->device->bus_type_str, f);
+
+	if ((size_t)n >= size) {
+		err(ctx, "Buffer size too small. Need %d bytes\n", n + 1);
+		rc = -ERANGE;
+		goto ext_uacce;
+	}
+
+	strcpy(buf, p);
+
+ext_uacce:
+	while (n1--)
+		free(d[n1]);
+	free(d);
+
+	return rc;
+}
+
 #define accfg_wq_set_field(wq, val, field) \
 ACCFG_EXPORT int accfg_wq_set_##field( \
 		struct accfg_wq *wq, int val) \
diff --git a/accfg/libaccel_config.h b/accfg/libaccel_config.h
index 94aef80..e61fd40 100644
--- a/accfg/libaccel_config.h
+++ b/accfg/libaccel_config.h
@@ -276,6 +276,7 @@ int accfg_wq_enable(struct accfg_wq *wq);
 int accfg_wq_disable(struct accfg_wq *wq, bool force);
 int accfg_wq_priority_boundary(struct accfg_wq *wq);
 int accfg_wq_size_boundary(struct accfg_device *device, int wq_num);
+int accfg_wq_get_uacce_path(struct accfg_wq *wq, char *buf, size_t size);
 
 /* libaccfg function for engine */
 struct accfg_engine;
-- 
2.26.3