rxgk_generate_transport_key
gk = rxgk_generate_transport_key(conn, token->rxgk, sp->hdr.cksum, GFP_NOFS);
gk = rxgk_generate_transport_key(conn, gk->key, key_number, GFP_NOFS);
gk = rxgk_generate_transport_key(conn, token->rxgk, conn->rxgk.key_number,
struct rxgk_context *rxgk_generate_transport_key(struct rxrpc_connection *conn,