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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/include/scsi/fc/fc_fcoe.h
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/* SPDX-License-Identifier: GPL-2.0-only */

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/*

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 * Copyright(c) 2007 Intel Corporation. All rights reserved.

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 *

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 * Maintained at www.Open-FCoE.org

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 */

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#ifndef _FC_FCOE_H_

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#define	_FC_FCOE_H_

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/*

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 * FCoE - Fibre Channel over Ethernet.

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 * See T11 FC-BB-5 Rev 2.00 (09-056v5.pdf)

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 */

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/*

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 * Default FC_FCOE_OUI / FC-MAP value.

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 */

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#define	FC_FCOE_OUI	0x0efc00	/* upper 24 bits of FCOE MAC */

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/*

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 * Fabric Login (FLOGI) MAC for non-FIP use.  Non-FIP use is deprecated.

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 */

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#define	FC_FCOE_FLOGI_MAC { 0x0e, 0xfc, 0x00, 0xff, 0xff, 0xfe }

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#define	FC_FCOE_VER	0			/* version */

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/*

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 * Ethernet Addresses based on FC S_ID and D_ID.

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 * Generated by FC_FCOE_OUI | S_ID/D_ID

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 */

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#define	FC_FCOE_ENCAPS_ID(n)	(((u64) FC_FCOE_OUI << 24) | (n))

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#define	FC_FCOE_DECAPS_ID(n)	((n) >> 24)

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/*

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 * FCoE frame header - 14 bytes

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 * This follows the VLAN header, which includes the ethertype.

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 */

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struct fcoe_hdr {

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	__u8		fcoe_ver;	/* version field - upper 4 bits */

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	__u8		fcoe_resvd[12];	/* reserved - send zero and ignore */

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	__u8		fcoe_sof;	/* start of frame per RFC 3643 */

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};

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#define FC_FCOE_DECAPS_VER(hp)	    ((hp)->fcoe_ver >> 4)

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#define FC_FCOE_ENCAPS_VER(hp, ver) ((hp)->fcoe_ver = (ver) << 4)

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/*

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 * FCoE CRC & EOF - 8 bytes.

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 */

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struct fcoe_crc_eof {

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	__le32		fcoe_crc32;	/* CRC for FC packet */

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	__u8		fcoe_eof;	/* EOF from RFC 3643 */

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	__u8		fcoe_resvd[3];	/* reserved - send zero and ignore */

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} __attribute__((packed));

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/*

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 * Minimum FCoE + FC header length

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 * 14 bytes FCoE header + 24 byte FC header = 38 bytes

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 */

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#define FCOE_HEADER_LEN 38

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/*

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 * Minimum FCoE frame size

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 * 14 bytes FCoE header + 24 byte FC header + 8 byte FCoE trailer = 46 bytes

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 */

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#define FCOE_MIN_FRAME 46

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/*

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 * FCoE Link Error Status Block: T11 FC-BB-5 Rev2.0, Clause 7.10.

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 */

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struct fcoe_fc_els_lesb {

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	__be32		lesb_link_fail;	/* link failure count */

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	__be32		lesb_vlink_fail; /* virtual link failure count */

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	__be32		lesb_miss_fka;	/* missing FIP keep-alive count */

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	__be32		lesb_symb_err;	/* symbol error during carrier count */

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	__be32		lesb_err_block;	/* errored block count */

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	__be32		lesb_fcs_error; /* frame check sequence error count */

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};

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/*

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 * fc_fcoe_set_mac - Store OUI + DID into MAC address field.

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 * @mac: mac address to be set

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 * @did: fc dest id to use

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 */

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static inline void fc_fcoe_set_mac(u8 *mac, u8 *did)

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{

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	mac[0] = (u8) (FC_FCOE_OUI >> 16);

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	mac[1] = (u8) (FC_FCOE_OUI >> 8);

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	mac[2] = (u8) FC_FCOE_OUI;

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	mac[3] = did[0];

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	mac[4] = did[1];

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	mac[5] = did[2];

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}

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#endif /* _FC_FCOE_H_ */

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