cvm_req_ctx
struct cvm_req_ctx *rctx = skcipher_request_ctx_dma(req);
struct cvm_req_ctx *rctx = skcipher_request_ctx_dma(req);
struct cvm_req_ctx *rctx = skcipher_request_ctx_dma(req);
struct cvm_req_ctx *rctx = skcipher_request_ctx_dma(req);
crypto_skcipher_set_reqsize_dma(tfm, sizeof(struct cvm_req_ctx));