chore: expose diskpool encryption feature for Mayastor

Signed-off-by: Diwakar Sharma <diwakar.sharma@datacore.com>

Author: dsharma-dc

io-engine/src/bin/io-engine.rs

@@ -97,6 +97,13 @@ fn start_tokio_runtime(args: &MayastorCliArgs) {
         warn!("RDMA is requested to be enabled for Mayastor NVMEoF target");
     }
 
+    // Use as-is basis for diskpool encryption since the spdk build is enabled
+    // --with-crypto.
+    // TODO: Once dpdk crypto modules are supported, we'll provide a switch
+    // later on to control the behaviour of choosing to use accel_sw based
+    // encryption if dpdk module(fips) isn't usable on platform.
+    env::set_var("ENABLE_DISKPOOL_ENCRYPTION", "true");
+
     unsafe {
         spdk_rs::libspdk::spdk_blob_enable_cluster_unmap(args.bs_cluster_unmap);
     }

io-engine/src/core/env.rs

@@ -270,11 +270,13 @@ impl MayastorFeatures {
         let lvm = env::var("ENABLE_LVM").as_deref() == Ok("true");
         let snapshot_rebuild = env::var("ENABLE_SNAPSHOT_REBUILD").as_deref() == Ok("true");
         let rdma_capable_io_engine = env::var("ENABLE_RDMA").as_deref() == Ok("true");
+        let diskpool_encryption = env::var("ENABLE_DISKPOOL_ENCRYPTION").as_deref() == Ok("true");
         MayastorFeatures {
             asymmetric_namespace_access: ana,
             logical_volume_manager: lvm,
             snapshot_rebuild,
             rdma_capable_io_engine,
+            diskpool_encryption,
         }
     }
     /// Get all the supported and enabled features.

io-engine/src/core/mod.rs

@@ -394,6 +394,8 @@ pub struct MayastorFeatures {
     pub snapshot_rebuild: bool,
     /// When set to true, the io-engine instance supports RDMA transport.
     pub rdma_capable_io_engine: bool,
+    /// Diskpool encryption capability.
+    pub diskpool_encryption: bool,
 }
 impl MayastorFeatures {
     /// Check if LVM feature is enabled.

io-engine/src/grpc/v1/host.rs

@@ -98,6 +98,7 @@ impl From<MayastorFeatures> for host_rpc::MayastorFeatures {
             logical_volume_manager: Some(f.logical_volume_manager),
             snapshot_rebuild: Some(f.snapshot_rebuild),
             rdma_capable_io_engine: Some(f.rdma_capable_io_engine),
+            diskpool_encryption: Some(f.diskpool_encryption),
         }
     }
 }