Function nlm_xlpsec_msgring_handler

freebsd/mips/nlm/dev/sec/nlmsec.c:249–305

This function is called from an interrupt handler */

/* This function is called from an interrupt handler */
void
nlm_xlpsec_msgring_handler(int vc, int size, int code, int src_id,
    struct nlm_fmn_msg *msg, void *data)
{
	struct xlp_sec_command *cmd = NULL;
	struct xlp_sec_softc *sc = NULL;
	uint8_t hash[HASH_MAX_LEN];

	KASSERT(code == FMN_SWCODE_CRYPTO,
	    ("%s: bad code = %d, expected code = %d\n", __FUNCTION__,
	    code, FMN_SWCODE_CRYPTO));

	sc = (struct xlp_sec_softc *)data;
	KASSERT(src_id >= sc->sec_vc_start && src_id <= sc->sec_vc_end,
	    ("%s: bad src_id = %d, expect %d - %d\n", __FUNCTION__,
	    src_id, sc->sec_vc_start, sc->sec_vc_end));

	cmd = (struct xlp_sec_command *)(uintptr_t)msg->msg[0];
	KASSERT(cmd != NULL && cmd->crp != NULL,
		("%s :cmd not received properly\n",__FUNCTION__));

	KASSERT(CRYPTO_ERROR(msg->msg[1]) == 0,
	    ("%s: Message rcv msg0 %llx msg1 %llx err %x \n", __FUNCTION__,
	    (unsigned long long)msg->msg[0], (unsigned long long)msg->msg[1],
	    (int)CRYPTO_ERROR(msg->msg[1])));

	/* If there are not enough credits to send, then send request
	 * will fail with ERESTART and the driver will be blocked until it is
	 * unblocked here after knowing that there are sufficient credits to
	 * send the request again.
	 */
	if (sc->sc_needwakeup) {
		atomic_add_int(&creditleft, sc->sec_msgsz);
		if (creditleft >= (NLM_CRYPTO_LEFT_REQS)) {
			crypto_unblock(sc->sc_cid, sc->sc_needwakeup);
			sc->sc_needwakeup &= (~(CRYPTO_SYMQ | CRYPTO_ASYMQ));
		}
	}
	if (cmd->hash_dst_len != 0) {
		if (cmd->crp->crp_op & CRYPTO_OP_VERIFY_DIGEST) {
			crypto_copydata(cmd->crp, cmd->crp->crp_digest_start,
			    cmd->hash_dst_len, hash);
			if (timingsafe_bcmp(cmd->hashdest, hash,
			    cmd->hash_dst_len) != 0)
				cmd->crp->crp_etype = EBADMSG;
		} else
			crypto_copyback(cmd->crp, cmd->crp->crp_digest_start,
			    cmd->hash_dst_len, cmd->hashdest);
	}

	/* This indicates completion of the crypto operation */
	crypto_done(cmd->crp);

	xlp_free_cmd_params(cmd);

	return;
}