[PATCH v8 5/6] ieee1275: ofpath enable NVMeoF logical device translate

Avnish Chouhan
2026-02-23T13:45:30Z

This patch adds code to enable the translation of logical devices to the of NVMeoFC paths.

Signed-off-by: Diego Domingos <diegodo@br.ibm.com>
Signed-off-by: Avnish Chouhan <avnish@linux.ibm.com>
Signed-off-by: Michael Chang <mchang@suse.com>
---
grub-core/osdep/linux/ofpath.c | 415 +++++++++++++++++++++++++++++++++++++++++++++++++++++--
include/grub/util/ofpath.h | 28 ++++++++++++++++++++++++++++
1 file changed, 434 insertions(+), 9 deletions(-)

diff --git a/grub-core/osdep/linux/ofpath.c b/grub-core/osdep/linux/ofpath.c
index 64f95a2..dd81e6b 100644
--- a/grub-core/osdep/linux/ofpath.c
+++ b/grub-core/osdep/linux/ofpath.c
@@ -37,6 +37,7 @@
#include <fcntl.h>
#include <errno.h>
#include <ctype.h>
+#include <dirent.h>

#ifdef __sparc__
typedef enum
@@ -136,7 +137,7 @@ trim_newline (char *path)
*end-- = '\0';
}

-#define MAX_DISK_CAT 64
+#define MAX_DISK_CAT 512

static char *
find_obppath (const char *sysfs_path_orig)
@@ -312,6 +313,91 @@ get_basename(char *p)
return ret;
}

+int
+add_filename_to_pile (char *filename, struct ofpath_files_list_root* root)
+{
+ struct ofpath_files_list_node* file;
+
+ file = malloc (sizeof (struct ofpath_files_list_node));
+ if (!file)
+ return -1;
+
+ file->filename = malloc (sizeof (char) * 1024);
+ if (!file->filename)
+ {
+ free (file);
+ return -1;
+ }
+
+ grub_strcpy (file->filename, filename);
+ if (root->first == NULL)
+ {
+ root->items = 1;
+ root->first = file;
+ file->next = NULL;
+ }
+ else
+ {
+ root->items++;
+ file->next = root->first;
+ root->first = file;
+ }
+
+ return 0;
+}
+
+void
+find_file (char* filename, char* directory, struct ofpath_files_list_root* root, int max_depth, int depth)
+{
+ struct dirent *ep;
+ struct stat statbuf;
+ DIR *dp;
+ int ret_val=0;
+ char* full_path;
+
+ if (depth > max_depth)
+ {
+ return;
+ }
+
+ if ((dp = opendir (directory)) == NULL)
+ {
+ return;
+ }
+
+ full_path = malloc (1024 * sizeof (char));
+ if (!full_path)
+ return;
+
+ while ((ep = readdir(dp)) != NULL)
+ {
+ snprintf (full_path, 1024, "%s/%s", directory, ep->d_name);
+ lstat (full_path, &statbuf);
+
+ if (S_ISLNK (statbuf.st_mode))
+ {
+ continue;
+ }
+
+ if (!strcmp (ep->d_name, ".") || !strcmp(ep->d_name, ".."))
+ {
+ continue;
+ }
+
+ if (!strcmp (ep->d_name, filename))
+ {
+ ret_val = add_filename_to_pile (full_path, root);
+ if (ret_val == -1)
+ continue;
+ }
+
+ find_file (filename, full_path, root, max_depth, depth+1);
+ }
+
+ free (full_path);
+ closedir (dp);
+}
+
static char *
of_path_of_vdisk(const char *sys_devname __attribute__((unused)),
const char *device,
@@ -382,7 +468,244 @@ of_fc_port_name (const char *path, const char *subpath, char *port_name)
free (basepath);
}

-#ifdef __sparc__
+void
+free_ofpath_files_list (struct ofpath_files_list_root* root)
+{
+ struct ofpath_files_list_node* node = root->first;
+ struct ofpath_files_list_node* next;
+
+ while (node!=NULL)
+ {
+ next = node->next;
+ free (node->filename);
+ free (node);
+ node = next;
+ }
+
+ free (root);
+ return;
+}
+
+char*
+of_find_fc_host (char* host_wwpn)
+{
+ FILE* fp;
+ char *buf;
+ char *ret_val;
+ char portname_filename[sizeof ("port_name")] = "port_name";
+ char devices_path[sizeof ("/sys/devices")] = "/sys/devices";
+ struct ofpath_files_list_root* portnames_file_list;
+ struct ofpath_files_list_node* node;
+
+ ret_val = malloc (sizeof (char) * 1024);
+ if (!ret_val)
+ return NULL;
+
+ portnames_file_list = malloc (sizeof (struct ofpath_files_list_root));
+ if (!portnames_file_list)
+ {
+ free (ret_val);
+ return NULL;
+ }
+
+ portnames_file_list->items = 0;
+ portnames_file_list->first = NULL;
+ find_file (portname_filename, devices_path, portnames_file_list, 10, 0);
+ node = portnames_file_list->first;
+
+ while (node != NULL)
+ {
+ fp = fopen(node->filename, "r");
+ buf = malloc (sizeof (char) * 512);
+ if (!buf)
+ break;
+
+ fscanf (fp, "%s", buf);
+ fclose (fp);
+
+ if ((strcmp (buf, host_wwpn) == 0) && grub_strstr (node->filename, "fc_host"))
+ {
+ free (buf);
+ grub_strcpy (ret_val, node->filename);
+ free_ofpath_files_list (portnames_file_list);
+ return ret_val;
+ }
+
+ node = node->next;
+ free (buf);
+ }
+ free_ofpath_files_list (portnames_file_list);
+ free (ret_val);
+ return NULL;
+}
+
+int
+of_path_get_nvmeof_adapter_info (char* sysfs_path,
+ struct ofpath_nvmeof_info* nvmeof_info)
+{
+ FILE *fp;
+ char *buf, *buf2, *buf3;
+
+ nvmeof_info->host_wwpn = malloc (sizeof (char) * 256);
+ nvmeof_info->target_wwpn = malloc (sizeof (char) * 256);
+ nvmeof_info->nqn = malloc (sizeof (char) * 256);
+
+ if (nvmeof_info->host_wwpn == NULL || nvmeof_info->target_wwpn == NULL || nvmeof_info->nqn == NULL)
+ {
+ free (nvmeof_info->host_wwpn);
+ free (nvmeof_info->target_wwpn);
+ free (nvmeof_info->nqn);
+ return -1;
+ }
+
+ buf = malloc (sizeof (char) * 512);
+ if (!buf)
+ {
+ free (nvmeof_info->host_wwpn);
+ free (nvmeof_info->target_wwpn);
+ free (nvmeof_info->nqn);
+ return -1;
+ }
+
+ snprintf (buf, 512, "%s/subsysnqn", sysfs_path);
+ if (! (fp = fopen (buf, "r")) ||
+ fscanf (fp, "%s", nvmeof_info->nqn) != 1)
+ {
+ if (fp)
+ fclose (fp);
+ free (nvmeof_info->host_wwpn);
+ free (nvmeof_info->target_wwpn);
+ free (nvmeof_info->nqn);
+ free (buf);
+ return -1;
+ }
+ fclose (fp);
+
+ snprintf (buf, 512, "%s/cntlid", sysfs_path);
+ if (! (fp = fopen (buf, "r")) ||
+ fscanf (fp, "%u", &(nvmeof_info->cntlid)) != 1)
+ {
+ if (fp)
+ fclose (fp);
+ free (nvmeof_info->host_wwpn);
+ free (nvmeof_info->target_wwpn);
+ free (nvmeof_info->nqn);
+ free (buf);
+ return -1;
+ }
+ fclose (fp);
+
+ snprintf (buf, 512, "%s/address", sysfs_path);
+ buf2 = NULL;
+ fp = NULL;
+ if (! (buf2 = malloc (sizeof (char) * 512)) ||
+ ! (fp = fopen (buf, "r")) ||
+ fscanf (fp, "%s", buf2) != 1)
+ {
+ if (fp)
+ fclose (fp);
+ free (nvmeof_info->host_wwpn);
+ free (nvmeof_info->target_wwpn);
+ free (nvmeof_info->nqn);
+ free (buf);
+ free (buf2);
+ return -1;
+ }
+
+ fclose (fp);
+
+ if (! (buf3 = strrchr (buf2, '-')))
+ {
+ free (nvmeof_info->host_wwpn);
+ free (nvmeof_info->target_wwpn);
+ free (nvmeof_info->nqn);
+ free (buf);
+ free (buf2);
+ return -1;
+ }
+ grub_memcpy (nvmeof_info->host_wwpn, buf3 + 1, 256);
+ if (! (buf3 = strchr (buf2, '-')) ||
+ ! (buf3 = strchr (buf3 + 1, '-')) ||
+ ! (buf3 = strchr (buf3 + 1, 'x')))
+ {
+ free (nvmeof_info->host_wwpn);
+ free (nvmeof_info->target_wwpn);
+ free (nvmeof_info->nqn);
+ free (buf);
+ free (buf2);
+ return -1;
+ }
+ grub_memcpy (nvmeof_info->target_wwpn, buf3 + 1, 256);
+ buf3 = strchr (nvmeof_info->target_wwpn, ',');
+ if (buf3)
+ *buf3 = '\0';
+ free (buf);
+ free (buf2);
+ return 0;
+}
+
+#define OFPATH_MAX_UINT_HEX_DIGITS 8
+#define OFPATH_MAX_INT_DIGITS 10
+
+static char *
+of_path_get_nvme_controller_name_node (const char* devname)
+{
+ char *controller_node, *end;
+
+ controller_node = xstrdup (devname);
+ end = grub_strchr (controller_node + 1, 'n');
+ if (end != NULL)
+ {
+ *end = '\0';
+ }
+
+ return controller_node;
+}
+
+unsigned int
+of_path_get_nvme_nsid (const char* devname)
+{
+ unsigned int nsid;
+ char *sysfs_path, *buf;
+ FILE *fp;
+
+ buf = malloc (sizeof(char) * 512);
+ if (!buf)
+ return 0;
+
+ sysfs_path = block_device_get_sysfs_path_and_link (devname);
+ snprintf (buf, 512, "%s/%s/nsid", sysfs_path, devname);
+ fp = fopen(buf, "r");
+ fscanf (fp, "%u", &(nsid));
+ fclose (fp);
+
+ free (sysfs_path);
+ free (buf);
+ return nsid;
+}
+
+static char *
+nvme_get_syspath (const char *nvmedev)
+{
+ char *sysfs_path;
+
+ sysfs_path = block_device_get_sysfs_path_and_link (nvmedev);
+ if (strstr (sysfs_path, "nvme-subsystem"))
+ {
+ char *controller_node = of_path_get_nvme_controller_name_node (nvmedev);
+ char *buf = xmalloc (strlen (sysfs_path) + strlen ("/") + strlen (controller_node) + 1);
+ strcpy (buf, sysfs_path);
+ strcat (buf, "/");
+ strcat (buf, controller_node);
+ free (sysfs_path);
+ free (controller_node);
+ sysfs_path = xrealpath (buf);
+ free (buf);
+ }
+
+ return sysfs_path;
+}
+
static char *
of_path_of_nvme(const char *sys_devname __attribute__((unused)),
const char *device,
@@ -391,6 +714,8 @@ of_path_of_nvme(const char *sys_devname __attribute__((unused)),
{
char *sysfs_path, *of_path, disk[MAX_DISK_CAT];
const char *digit_string, *part_end;
+ int chars_written, ret_val;
+ struct ofpath_nvmeof_info* nvmeof_info;

digit_string = trailing_digits (device);
part_end = devicenode + strlen (devicenode) - 1;
@@ -410,15 +735,90 @@ of_path_of_nvme(const char *sys_devname __attribute__((unused)),
/* Remove the p. */
*end = '\0';
sscanf (digit_string, "%d", &part);
- snprintf (disk, sizeof (disk), "/disk@1:%c", 'a' + (part - 1));
- sysfs_path = block_device_get_sysfs_path_and_link (nvmedev);
+ sysfs_path = nvme_get_syspath (nvmedev);
+
+ /* If is a NVMeoF */
+ if (strstr (sysfs_path, "nvme-fabrics"))
+ {
+ nvmeof_info = malloc (sizeof (struct ofpath_nvmeof_info));
+ if (!nvmeof_info)
+ {
+ free (nvmedev);
+ return NULL;
+ }
+
+ ret_val = of_path_get_nvmeof_adapter_info (sysfs_path, nvmeof_info);
+ if (ret_val == -1)
+ {
+ free (nvmedev);
+ free (nvmeof_info);
+ return NULL;
+ }
+
+ sysfs_path = of_find_fc_host (nvmeof_info->host_wwpn);
+ if (!sysfs_path)
+ {
+ free (nvmedev);
+ free (nvmeof_info);
+ return NULL;
+ }
+
+ chars_written = snprintf (disk,sizeof(disk), "/nvme-of/controller@%s,%x:nqn=%s",
+ nvmeof_info->target_wwpn,0xffff,
+ nvmeof_info->nqn);
+ unsigned int nsid = of_path_get_nvme_nsid (nvmedev);
+ if (nsid)
+ {
+ snprintf (disk+chars_written, sizeof("/namespace@") + OFPATH_MAX_UINT_HEX_DIGITS + OFPATH_MAX_INT_DIGITS,
+ "/namespace@%x:%d", nsid, part);
+ }
+ free (nvmeof_info);
+ }
+ else
+ {
+ snprintf (disk, sizeof (disk), "/disk@1:%c", 'a' + (part - 1));
+ }
free (nvmedev);
}
else
{
/* We do not have the parition. */
- snprintf (disk, sizeof (disk), "/disk@1");
- sysfs_path = block_device_get_sysfs_path_and_link (device);
+ sysfs_path = nvme_get_syspath (device);
+ if (strstr (sysfs_path, "nvme-fabrics"))
+ {
+ nvmeof_info = malloc (sizeof (struct ofpath_nvmeof_info));
+ if (!nvmeof_info)
+ return NULL;
+
+ ret_val = of_path_get_nvmeof_adapter_info (sysfs_path, nvmeof_info);
+ if (ret_val == -1)
+ {
+ free (nvmeof_info);
+ return NULL;
+ }
+
+ sysfs_path = of_find_fc_host (nvmeof_info->host_wwpn);
+ if (!sysfs_path)
+ {
+ free (nvmeof_info);
+ return NULL;
+ }
+
+ chars_written = snprintf (disk,sizeof(disk), "/nvme-of/controller@%s,%x:nqn=%s",
+ nvmeof_info->target_wwpn, 0xffff,
+ nvmeof_info->nqn);
+ unsigned int nsid = of_path_get_nvme_nsid (device);
+ if (nsid)
+ {
+ snprintf (disk+chars_written,sizeof("/namespace@") + sizeof(char) * OFPATH_MAX_UINT_HEX_DIGITS,
+ "/namespace@%x", nsid);
+ }
+ free (nvmeof_info);
+ }
+ else
+ {
+ snprintf (disk, sizeof (disk), "/disk@1");
+ }
}

of_path = find_obppath (sysfs_path);
@@ -429,7 +829,6 @@ of_path_of_nvme(const char *sys_devname __attribute__((unused)),
free (sysfs_path);
return of_path;
}
-#endif

static int
vendor_is_ATA(const char *path)
@@ -779,11 +1178,9 @@ grub_util_devname_to_ofpath (const char *sys_devname)
/* All the models I've seen have a devalias "floppy".
New models have no floppy at all. */
ofpath = xstrdup ("floppy");
-#ifdef __sparc__
else if (device[0] == 'n' && device[1] == 'v' && device[2] == 'm'
&& device[3] == 'e')
ofpath = of_path_of_nvme (name_buf, device, devnode, devicenode);
-#endif
else
{
grub_util_warn (_("unknown device type %s"), device);
diff --git a/include/grub/util/ofpath.h b/include/grub/util/ofpath.h
index b43c523..85172bc 100644
--- a/include/grub/util/ofpath.h
+++ b/include/grub/util/ofpath.h
@@ -3,4 +3,32 @@

char *grub_util_devname_to_ofpath (const char *devname);

+struct ofpath_files_list_node
+{
+ char* filename;
+ struct ofpath_files_list_node* next;
+};
+
+struct ofpath_files_list_root
+{
+ int items;
+ struct ofpath_files_list_node* first;
+};
+
+struct ofpath_nvmeof_info
+{
+ char* host_wwpn;
+ char* target_wwpn;
+ char* nqn;
+ int cntlid;
+ int nsid;
+};
+
+int of_path_get_nvmeof_adapter_info (char* sysfs_path, struct ofpath_nvmeof_info* nvmeof_info);
+unsigned int of_path_get_nvme_nsid (const char* devname);
+int add_filename_to_pile (char *filename, struct ofpath_files_list_root* root);
+void find_file (char* filename, char* directory, struct ofpath_files_list_root* root, int max_depth, int depth);
+char* of_find_fc_host (char* host_wwpn);
+void free_ofpath_files_list (struct ofpath_files_list_root* root);
+
#endif /* ! GRUB_OFPATH_MACHINE_UTIL_HEADER */
--
2.50.1 (Apple Git-155)