Description

In RHEL-10 we are no longer supporting DMMP multi-pathing with NVMe.  Therfore, we want to remove all of the code associated with CONFIG_NVME_MULTIPATH from upstream kernel, and modify all user level components that my be dependent upon the kernel configuration and sysfs variables.

 &dev_attr_ana_grpid.attr,
 &dev_attr_ana_state.attr,
&subsys_attr_iopolicy.attr,

The following kernel code paths will be affected.

C symbol: CONFIG_NVME_MULTIPATH

  File       Function                  Line
0 ioctl.c    <global>                   672 #ifdef CONFIG_NVME_MULTIPATH
1 nvme.h     <global>                   189 #ifdef CONFIG_NVME_MULTIPATH
2 nvme.h     <global>                   358 #ifdef CONFIG_NVME_MULTIPATH
3 nvme.h     <global>                   442 #ifdef CONFIG_NVME_MULTIPATH
4 nvme.h     <global>                   494 #ifdef CONFIG_NVME_MULTIPATH
5 nvme.h     <global>                   523 #ifdef CONFIG_NVME_MULTIPATH
6 nvme.h     <global>                   940 #ifdef CONFIG_NVME_MULTIPATH
7 sysfs.c    <global>                   258 #ifdef CONFIG_NVME_MULTIPATH
8 sysfs.c    <global>                   863 #ifdef CONFIG_NVME_MULTIPATH
9 autoconf.h <global>                  1703 #define CONFIG_NVME_MULTIPATH 1
a core.c     nvme_alloc_ns_head        3599 #ifdef CONFIG_NVME_MULTIPATH
b core.c     nvme_handle_aen_notice    4457 #ifdef CONFIG_NVME_MULTIPATH
c nvme.h     nvme_ns_head_multipath     508 return IS_ENABLED(CONFIG_NVME_MULTIPATH) && head->disk;
d sysfs.c    nvme_ns_attrs_are_visible  285 #ifdef CONFIG_NVME_MULTIPATH

C symbol: multipath

  File        Function                 Line
0 multipath.c <global>                   12 bool multipath = true;
1 multipath.c <global>                   13 module_param(multipath, bool, 0444);
2 multipath.c <global>                   14 MODULE_PARM_DESC(multipath,
3 nvme.h      <global>                  975 extern bool multipath;
4 nvme.h      <global>                  985 #define multipath false
5 core.c      nvme_init_ns_head        3751 if (!multipath)

else if (multipath) {
7 multipath.c nvme_mpath_alloc_disk     630 !nvme_is_unique_nsid(ctrl, head) || !multipath)
8 multipath.c nvme_mpath_init_identify 1037 if (!multipath || !ctrl->subsys ||

What SSTs and Layered Product teams should review this?

rhel-sst-storage-io
rhel-sst-logical-storage
systemd