i40e: adds FCoE code to the i40e driver

/*******************************************************************************

 *

 * Intel Ethernet Controller XL710 Family Linux Driver

 * Copyright(c) 2013 - 2014 Intel Corporation.

 *

 * This program is free software; you can redistribute it and/or modify it

 * under the terms and conditions of the GNU General Public License,

 * version 2, as published by the Free Software Foundation.

 *

 * This program is distributed in the hope it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for

 * more details.

 *

 * You should have received a copy of the GNU General Public License along

 * with this program.  If not, see <http://www.gnu.org/licenses/>.

 *

 * The full GNU General Public License is included in this distribution in

 * the file called "COPYING".

 *

 * Contact Information:

 * e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>

 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497

 *

 ******************************************************************************/

#ifndef _I40E_FCOE_H_

#define _I40E_FCOE_H_

/* FCoE HW context helper macros */

#define I40E_DDP_CONTEXT_DESC(R, i)     \

	(&(((struct i40e_fcoe_ddp_context_desc *)((R)->desc))[i]))

#define I40E_QUEUE_CONTEXT_DESC(R, i)   \

	(&(((struct i40e_fcoe_queue_context_desc *)((R)->desc))[i]))

#define I40E_FILTER_CONTEXT_DESC(R, i)  \

	(&(((struct i40e_fcoe_filter_context_desc *)((R)->desc))[i]))

/* receive queue descriptor filter status for FCoE */

#define I40E_RX_DESC_FLTSTAT_FCMASK	0x3

#define I40E_RX_DESC_FLTSTAT_NOMTCH	0x0	/* no ddp context match */

#define I40E_RX_DESC_FLTSTAT_NODDP	0x1	/* no ddp due to error */

#define I40E_RX_DESC_FLTSTAT_DDP	0x2	/* DDPed payload, post header */

#define I40E_RX_DESC_FLTSTAT_FCPRSP	0x3	/* FCP_RSP */

/* receive queue descriptor error codes for FCoE */

#define I40E_RX_DESC_FCOE_ERROR_MASK		\

	(I40E_RX_DESC_ERROR_L3L4E_PROT |	\

	 I40E_RX_DESC_ERROR_L3L4E_FC |		\

	 I40E_RX_DESC_ERROR_L3L4E_DMAC_ERR |	\

	 I40E_RX_DESC_ERROR_L3L4E_DMAC_WARN)

/* receive queue descriptor programming error */

#define I40E_RX_PROG_FCOE_ERROR_TBL_FULL(e)	\

	(((e) >> I40E_RX_PROG_STATUS_DESC_FCOE_TBL_FULL_SHIFT) & 0x1)

#define I40E_RX_PROG_FCOE_ERROR_CONFLICT(e)	\

	(((e) >> I40E_RX_PROG_STATUS_DESC_FCOE_CONFLICT_SHIFT) & 0x1)

#define I40E_RX_PROG_FCOE_ERROR_TBL_FULL_BIT	\

	(1 << I40E_RX_PROG_STATUS_DESC_FCOE_TBL_FULL_SHIFT)

#define I40E_RX_PROG_FCOE_ERROR_CONFLICT_BIT	\

	(1 << I40E_RX_PROG_STATUS_DESC_FCOE_CONFLICT_SHIFT)

#define I40E_RX_PROG_FCOE_ERROR_INVLFAIL(e)	\

	I40E_RX_PROG_FCOE_ERROR_CONFLICT(e)

#define I40E_RX_PROG_FCOE_ERROR_INVLFAIL_BIT	\

	I40E_RX_PROG_FCOE_ERROR_CONFLICT_BIT

/* FCoE DDP related definitions */

#define I40E_FCOE_MIN_XID	0x0000  /* the min xid supported by fcoe_sw */

#define I40E_FCOE_MAX_XID	0x0FFF  /* the max xid supported by fcoe_sw */

#define I40E_FCOE_DDP_BUFFCNT_MAX	512	/* 9 bits bufcnt */

#define I40E_FCOE_DDP_PTR_ALIGN		16

#define I40E_FCOE_DDP_PTR_MAX	(I40E_FCOE_DDP_BUFFCNT_MAX * sizeof(dma_addr_t))

#define I40E_FCOE_DDP_BUF_MIN	4096

#define I40E_FCOE_DDP_MAX	2048

#define I40E_FCOE_FILTER_CTX_QW1_PCTYPE_SHIFT	8

/* supported netdev features for FCoE */

#define I40E_FCOE_NETIF_FEATURES (NETIF_F_ALL_FCOE | \

	NETIF_F_HW_VLAN_CTAG_TX | \

	NETIF_F_HW_VLAN_CTAG_RX | \

	NETIF_F_HW_VLAN_CTAG_FILTER)

/* DDP context flags */

enum i40e_fcoe_ddp_flags {

	__I40E_FCOE_DDP_NONE = 1,

	__I40E_FCOE_DDP_TARGET,

	__I40E_FCOE_DDP_INITALIZED,

	__I40E_FCOE_DDP_PROGRAMMED,

	__I40E_FCOE_DDP_DONE,

	__I40E_FCOE_DDP_ABORTED,

	__I40E_FCOE_DDP_UNMAPPED,

};

/* DDP SW context struct */

struct i40e_fcoe_ddp {

	int len;

	u16 xid;

	u16 firstoff;

	u16 lastsize;

	u16 list_len;

	u8 fcerr;

	u8 prerr;

	unsigned long flags;

	unsigned int sgc;

	struct scatterlist *sgl;

	dma_addr_t udp;

	u64 *udl;

	struct dma_pool *pool;

};

struct i40e_fcoe_ddp_pool {

	struct dma_pool *pool;

};

struct i40e_fcoe {

	unsigned long mode;

	atomic_t refcnt;

	struct i40e_fcoe_ddp_pool __percpu *ddp_pool;

	struct i40e_fcoe_ddp ddp[I40E_FCOE_DDP_MAX];

};

#endif /* _I40E_FCOE_H_ */