common/nvme: add helper functions to define a nvme target

Add:
- _create_nvmet_port()
- _remove_nvmet_port()
- _create_nvmet_subsystem()
- _remove_nvmet_subsytem()
- _add_nvmet_subsys_to_port()
- _remove_nvmet_subsystem_from_port()

which serve as helper functions to create new nvmet ports and
subsystems for NVMe over Fabrics focused test cases.

Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>

diff --git a/common/nvme b/common/nvme
index 4c198a2e806c378b76652f362a0ce83e7e39f126..400f66690f52a3db1862311a6cc5c81bcda0832f 100644 (file)
--- a/common/nvme
+++ b/common/nvme
@@ -24,3 +24,61 @@ _test_dev_is_nvme() {
        fi
        return 0
 }
+
+_create_nvmet_port() {
+       local trtype="$1"
+       local nvmet_cfs="/sys/kernel/config/nvmet/"
+
+       local port=$(($(ls "${nvmet_cfs}" | wc -l) + 1))
+
+       mkdir "${nvmet_cfs}/ports/${port}"
+       echo "${trtype}" > "${nvmet_cfs}/ports/${port}/addr_trtype"
+
+       echo "${port}"
+}
+
+_remove_nvmet_port() {
+       local port="$1"
+       local nvmet_cfs="/sys/kernel/config/nvmet/"
+       rmdir "${nvmet_cfs}/ports/${port}"
+}
+
+_create_nvmet_subsystem() {
+       local nvmet_subsystem="$1"
+       local blkdev="$2"
+       local nvmet_cfs="/sys/kernel/config/nvmet/"
+       local cfs_path="${nvmet_cfs}/subsystems/${nvmet_subsystem}"
+
+       mkdir -p "${cfs_path}"
+       echo 1 > "${cfs_path}/attr_allow_any_host"
+       mkdir "${cfs_path}/namespaces/1"
+       printf "%s" "$blkdev" > "${cfs_path}/namespaces/1/device_path"
+       printf 1 > "${cfs_path}/namespaces/1/enable"
+}
+
+_remove_nvmet_subsystem() {
+       local nvmet_subsystem="$1"
+       local nvmet_cfs="/sys/kernel/config/nvmet/"
+       local cfs_path="${nvmet_cfs}/subsystems/${nvmet_subsystem}"
+
+       echo 0 > "${cfs_path}/namespaces/1/enable"
+       rmdir "${cfs_path}/namespaces/1/"
+       rmdir "${cfs_path}"
+}
+
+_add_nvmet_subsys_to_port() {
+       local port="$1"
+       local nvmet_subsystem="$2"
+       local nvmet_cfs="/sys/kernel/config/nvmet/"
+
+       ln -s "${nvmet_cfs}/subsystems/${nvmet_subsystem}" \
+               "${nvmet_cfs}/ports/${port}/subsystems/${nvmet_subsystem}"
+}
+
+_remove_nvmet_subsystem_from_port() {
+       local port="$1"
+       local nvmet_subsystem="$2"
+       local nvmet_cfs="/sys/kernel/config/nvmet/"
+
+       rm "${nvmet_cfs}/ports/${port}/subsystems/${nvmet_subsystem}"
+}