52 lines
1.4 KiB
C
52 lines
1.4 KiB
C
/*
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* Copyright (c) 2020 Linaro Ltd
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#ifndef ZEPHYR_DRIVERS_ETHERNET_ETH_H_
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#define ZEPHYR_DRIVERS_ETHERNET_ETH_H_
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#include <zephyr/types.h>
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#include <random/rand32.h>
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/* helper macro to return mac address octet from local_mac_address prop */
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#define NODE_MAC_ADDR_OCTET(node, n) DT_PROP_BY_IDX(node, local_mac_address, n)
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/* Determine if a mac address is all 0's */
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#define NODE_MAC_ADDR_NULL(node) \
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((NODE_MAC_ADDR_OCTET(node, 0) == 0) && \
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(NODE_MAC_ADDR_OCTET(node, 1) == 0) && \
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(NODE_MAC_ADDR_OCTET(node, 2) == 0) && \
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(NODE_MAC_ADDR_OCTET(node, 3) == 0) && \
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(NODE_MAC_ADDR_OCTET(node, 4) == 0) && \
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(NODE_MAC_ADDR_OCTET(node, 5) == 0))
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/* Given a device tree node for an ethernet controller will
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* returns false if there is no local-mac-address property or
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* the property is all zero's. Otherwise will return True
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*/
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#define NODE_HAS_VALID_MAC_ADDR(node) \
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UTIL_AND(DT_NODE_HAS_PROP(node, local_mac_address),\
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(!NODE_MAC_ADDR_NULL(node)))
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static inline void gen_random_mac(uint8_t *mac_addr, uint8_t b0, uint8_t b1, uint8_t b2)
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{
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uint32_t entropy;
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entropy = sys_rand32_get();
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mac_addr[0] = b0;
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mac_addr[1] = b1;
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mac_addr[2] = b2;
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/* Set MAC address locally administered, unicast (LAA) */
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mac_addr[0] |= 0x02;
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mac_addr[3] = (entropy >> 16) & 0xff;
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mac_addr[4] = (entropy >> 8) & 0xff;
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mac_addr[5] = (entropy >> 0) & 0xff;
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}
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#endif /* ZEPHYR_DRIVERS_ETHERNET_ETH_H_ */
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