path: root/drivers/scsi/cxgbi/libcxgbi.h

/*
 * libcxgbi.h: Chelsio common library for T3/T4 iSCSI driver.
 *
 * Copyright (c) 2010 Chelsio Communications, Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation.
 *
 * Written by: Karen Xie (kxie@chelsio.com)
 * Written by: Rakesh Ranjan (rranjan@chelsio.com)
 */

#ifndef	__LIBCXGBI_H__
#define	__LIBCXGBI_H__

#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/debugfs.h>
#include <linux/list.h>
#include <linux/netdevice.h>
#include <linux/if_vlan.h>
#include <linux/scatterlist.h>
#include <linux/skbuff.h>
#include <linux/vmalloc.h>
#include <scsi/scsi_device.h>
#include <scsi/libiscsi_tcp.h>

enum cxgbi_dbg_flag {
	CXGBI_DBG_ISCSI,
	CXGBI_DBG_DDP,
	CXGBI_DBG_TOE,
	CXGBI_DBG_SOCK,

	CXGBI_DBG_PDU_TX,
	CXGBI_DBG_PDU_RX,
	CXGBI_DBG_DEV,
};

#define log_debug(level, fmt, ...)	\
	do {	\
		if (dbg_level & (level)) \
			pr_info(fmt, ##__VA_ARGS__); \
	} while (0)

#define pr_info_ipaddr(fmt_trail,					\
			addr1, addr2, args_trail...)			\
do {									\
	if (!((1 << CXGBI_DBG_SOCK) & dbg_level))			\
		break;							\
	pr_info("%pISpc - %pISpc, " fmt_trail,				\
		addr1, addr2, args_trail);				\
} while (0)

/* max. connections per adapter */
#define CXGBI_MAX_CONN		16384

/* always allocate rooms for AHS */
#define SKB_TX_ISCSI_PDU_HEADER_MAX	\
	(sizeof(struct iscsi_hdr) + ISCSI_MAX_AHS_SIZE)

#define	ISCSI_PDU_NONPAYLOAD_LEN	312 /* bhs(48) + ahs(256) + digest(8)*/

/*
 * align pdu size to multiple of 512 for better performance
 */
#define cxgbi_align_pdu_size(n) do { n = (n) & (~511); } while (0)

#define ULP2_MODE_ISCSI		2

#define ULP2_MAX_PKT_SIZE	16224
#define ULP2_MAX_PDU_PAYLOAD	\
	(ULP2_MAX_PKT_SIZE - ISCSI_PDU_NONPAYLOAD_LEN)

/*
 * For iscsi connections HW may inserts digest bytes into the pdu. Those digest
 * bytes are not sent by the host but are part of the TCP payload and therefore
 * consume TCP sequence space.
 */
static const unsigned int ulp2_extra_len[] = { 0, 4, 4, 8 };
static inline unsigned int cxgbi_ulp_extra_len(int submode)
{
	return ulp2_extra_len[submode & 3];
}

/*
 * struct pagepod_hdr, pagepod - pagepod format
 */

#define CPL_RX_DDP_STATUS_DDP_SHIFT	16 /* ddp'able */
#define CPL_RX_DDP_STATUS_PAD_SHIFT	19 /* pad error */
#define CPL_RX_DDP_STATUS_HCRC_SHIFT	20 /* hcrc error */
#define CPL_RX_DDP_STATUS_DCRC_SHIFT	21 /* dcrc error */

struct cxgbi_pagepod_hdr {
	u32 vld_tid;
	u32 pgsz_tag_clr;
	u32 max_offset;
	u32 page_offset;
	u64 rsvd;
};

#define PPOD_PAGES_MAX			4
struct cxgbi_pagepod {
	struct cxgbi_pagepod_hdr hdr;
	u64 addr[PPOD_PAGES_MAX + 1];
};

struct cxgbi_tag_format {
	unsigned char sw_bits;
	unsigned char rsvd_bits;
	unsigned char rsvd_shift;
	unsigned char filler[1];
	u32 rsvd_mask;
};

struct cxgbi_gather_list {
	unsigned int tag;
	unsigned int length;
	unsigned int offset;
	unsigned int nelem;
	struct page **pages;
	dma_addr_t phys_addr[0];
};

struct cxgbi_ddp_info {
	struct kref refcnt;
	struct cxgbi_device *cdev;
	struct pci_dev *pdev;
	unsigned int max_txsz;
	unsigned int max_rxsz;
	unsigned int llimit;
	unsigned int ulimit;
	unsigned int nppods;
	unsigned int idx_last;
	unsigned char idx_bits;
	unsigned char filler[3];
	unsigned int idx_mask;
	unsigned int rsvd_tag_mask;
	spinlock_t map_lock;
	struct cxgbi_gather_list **gl_map;
};

#define DDP_PGIDX_MAX		4
#define DDP_THRESHOLD		2048

#define PPOD_PAGES_SHIFT	2       /*  4 pages per pod */

#define PPOD_SIZE               sizeof(struct cxgbi_pagepod)  /*  64 */
#define PPOD_SIZE_SHIFT         6

#define ULPMEM_DSGL_MAX_NPPODS	16	/*  1024/PPOD_SIZE */
#define ULPMEM_IDATA_MAX_NPPODS	4	/*  256/PPOD_SIZE */
#define PCIE_MEMWIN_MAX_NPPODS	16	/*  1024/PPOD_SIZE */

#define PPOD_COLOR_SHIFT	0
#define PPOD_COLOR(x)		((x) << PPOD_COLOR_SHIFT)

#define PPOD_IDX_SHIFT          6
#define PPOD_IDX_MAX_SIZE       24

#define PPOD_TID_SHIFT		0
#define PPOD_TID(x)		((x) << PPOD_TID_SHIFT)

#define PPOD_TAG_SHIFT		6
#define PPOD_TAG(x)		((x) << PPOD_TAG_SHIFT)

#define PPOD_VALID_SHIFT	24
#define PPOD_VALID(x)		((x) << PPOD_VALID_SHIFT)
#define PPOD_VALID_FLAG		PPOD_VALID(1U)

/*
 * sge_opaque_hdr -
 * Opaque version of structure the SGE stores at skb->head of TX_DATA packets
 * and for which we must reserve space.
 */
struct sge_opaque_hdr {
	void *dev;
	dma_addr_t addr[MAX_SKB_FRAGS + 1];
};

struct cxgbi_sock {
	struct cxgbi_device *cdev;

	int tid;
	int atid;
	unsigned long flags;
	unsigned int mtu;
	unsigned short rss_qid;
	unsigned short txq_idx;
	unsigned short advmss;
	unsigned int tx_chan;
	unsigned int rx_chan;
	unsigned int mss_idx;
	unsigned int smac_idx;
	unsigned char port_id;
	int wr_max_cred;
	int wr_cred;
	int wr_una_cred;
	unsigned char hcrc_len;
	unsigned char dcrc_len;

	void *l2t;
	struct sk_buff *wr_pending_head;
	struct sk_buff *wr_pending_tail;
	struct sk_buff *cpl_close;
	struct sk_buff *cpl_abort_req;
	struct sk_buff *cpl_abort_rpl;
	struct sk_buff *skb_ulp_lhdr;
	spinlock_t lock;
	struct kref refcnt;
	unsigned int state;
	unsigned int csk_family;
	union {
		struct sockaddr_in saddr;
		struct sockaddr_in6 saddr6;
	};
	union {
		struct sockaddr_in daddr;
		struct sockaddr_in6 daddr6;
	};
	struct dst_entry *dst;
	struct sk_buff_head receive_queue;
	struct sk_buff_head write_queue;
	struct timer_list retry_timer;
	int err;
	rwlock_t callback_lock;
	void *user_data;

	u32 rcv_nxt;
	u32 copied_seq;
	u32 rcv_wup;
	u32 snd_nxt;
	u32 snd_una;
	u32 write_seq;
};

/*
 * connection states
 */
enum cxgbi_sock_states{
	CTP_CLOSED,
	CTP_CONNECTING,
	CTP_ACTIVE_OPEN,
	CTP_ESTABLISHED,
	CTP_ACTIVE_CLOSE,
	CTP_PASSIVE_CLOSE,
	CTP_CLOSE_WAIT_1,
	CTP_CLOSE_WAIT_2,
	CTP_ABORTING,
};

/*
 * Connection flags -- many to track some close related events.
 */
enum cxgbi_sock_flags {
	CTPF_ABORT_RPL_RCVD,	/*received one ABORT_RPL_RSS message */
	CTPF_ABORT_REQ_RCVD,	/*received one ABORT_REQ_RSS message */
	CTPF_ABORT_RPL_PENDING,	/* expecting an abort reply */
	CTPF_TX_DATA_SENT,	/* already sent a TX_DATA WR */
	CTPF_ACTIVE_CLOSE_NEEDED,/* need to be closed */
	CTPF_HAS_ATID,		/* reserved atid */
	CTPF_HAS_TID,		/* reserved hw tid */
	CTPF_OFFLOAD_DOWN,	/* offload function off */
};

struct cxgbi_skb_rx_cb {
	__u32 ddigest;
	__u32 pdulen;
};

struct cxgbi_skb_tx_cb {
	void *l2t;
	struct sk_buff *wr_next;
};

enum cxgbi_skcb_flags {
	SKCBF_TX_NEED_HDR,	/* packet needs a header */
	SKCBF_RX_COALESCED,	/* received whole pdu */
	SKCBF_RX_HDR,		/* received pdu header */
	SKCBF_RX_DATA,		/* received pdu payload */
	SKCBF_RX_STATUS,	/* received ddp status */
	SKCBF_RX_DATA_DDPD,	/* pdu payload ddp'd */
	SKCBF_RX_HCRC_ERR,	/* header digest error */
	SKCBF_RX_DCRC_ERR,	/* data digest error */
	SKCBF_RX_PAD_ERR,	/* padding byte error */
};

struct cxgbi_skb_cb {
	unsigned char ulp_mode;
	unsigned long flags;
	unsigned int seq;
	union {
		struct cxgbi_skb_rx_cb rx;
		struct cxgbi_skb_tx_cb tx;
	};
};

#define CXGBI_SKB_CB(skb)	((struct cxgbi_skb_cb *)&