[SCSI] libcxgbi: common library for cxgb3i and cxgb4i

[PATCH v5 1/3] libcxgbi: common library for cxgb3i and cxgb4i

From: Karen Xie <kxie@chelsio.com>

Extracts common functions to libcxgbi.

Signed-off-by: Karen Xie <kxie@chelsio.com>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

1 files changed, 753 insertions, 0 deletions

diff --git a/drivers/scsi/cxgbi/libcxgbi.h b/drivers/scsi/cxgbi/libcxgbi.h
new file mode 100644
index 000000000000..40551f3be5dc
--- /dev/null
+++ b/drivers/scsi/cxgbi/libcxgbi.h
@@ -0,0 +1,753 @@
+/*
+ * 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)
+
+/* 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;
+	struct sk_buff **gl_skb;
+};
+
+#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)
+
+#define W_TCB_ULP_TYPE          0
+#define TCB_ULP_TYPE_SHIFT      0
+#define TCB_ULP_TYPE_MASK       0xfULL
+#define TCB_ULP_TYPE(x)         ((x) << TCB_ULP_TYPE_SHIFT)
+
+#define W_TCB_ULP_RAW           0
+#define TCB_ULP_RAW_SHIFT       4
+#define TCB_ULP_RAW_MASK        0xffULL
+#define TCB_ULP_RAW(x)          ((x) << TCB_ULP_RAW_SHIFT)
+
+/*
+ * 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;
+	struct sockaddr_in saddr;
+	struct sockaddr_in daddr;
+	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,		/* recieved pdu header */
+	SKCBF_RX_DATA,		/* recieved pdu payload */
+	SKCBF_RX_STATUS,	/* recieved 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 *)&((skb)->cb[0]))
+#define cxgbi_skcb_flags(skb)		(CXGBI_SKB_CB(skb)->flags)
+#define cxgbi_skcb_ulp_mode(skb)	(CXGBI_SKB_CB(skb)->ulp_mode)
+#define cxgbi_skcb_tcp_seq(skb)		(CXGBI_SKB_CB(skb)->seq)
+#define cxgbi_skcb_rx_ddigest(skb)	(CXGBI_SKB_CB(skb)->rx.ddigest)
+#define cxgbi_skcb_rx_pdulen(skb)	(CXGBI_SKB_CB(skb)->rx.pdulen)
+#define cxgbi_skcb_tx_wr_next(skb)	(CXGBI_SKB_CB(skb)->tx.wr_next)
+
+static inline void cxgbi_skcb_set_flag(struct sk_buff *skb,
+					enum cxgbi_skcb_flags flag)
+{
+	__set_bit(flag, &(cxgbi_skcb_flags(skb)));
+}
+
+static inline void cxgbi_skcb_clear_flag(struct sk_buff *skb,
+					enum cxgbi_skcb_flags flag)
+{
+	__clear_bit(flag, &(cxgbi_skcb_flags(skb)));
+}
+
+static inline int cxgbi_skcb_test_flag(struct sk_buff *skb,
+					enum cxgbi_skcb_flags flag)
+{
+	return test_bit(flag, &(cxgbi_skcb_flags(skb)));
+}
+
+static inline void cxgbi_sock_set_flag(struct cxgbi_sock *csk,
+					enum cxgbi_sock_flags flag)
+{
+	__set_bit(flag, &csk->flags);
+	log_debug(1 << CXGBI_DBG_SOCK,
+		"csk 0x%p,%u,0x%lx, bit %d.\n",
+		csk, csk->state, csk->flags, flag);
+}
+
+static inline void cxgbi_sock_clear_flag(struct cxgbi_sock *csk,
+					enum cxgbi_sock_flags flag)
+{
+	__clear_bit(flag, &csk->flags);
+	log_debug(1 << CXGBI_DBG_SOCK,
+		"csk 0x%p,%u,0x%lx, bit %d.\n",
+		csk, csk->state, csk->flags, flag);
+}
+
+static inline int cxgbi_sock_flag(struct cxgbi_sock *csk,
+				enum cxgbi_sock_flags flag)
+{
+	if (csk == NULL)
+		return 0;
+	return test_bit(flag, &csk->flags);
+}
+
+static inline void cxgbi_sock_set_state(struct cxgbi_sock *csk, int state)
+{
+	log_debug(1 << CXGBI_DBG_SOCK,
+		"csk 0x%p,%u,0x%lx, state -> %u.\n",
+		csk, csk->state, csk->flags, state);
+	csk->state = state;
+}
+
+static inline void cxgbi_sock_free(struct kref *kref)
+{
+	struct cxgbi_sock *csk = container_of(kref,
+						struct cxgbi_sock,
+						refcnt);
+	if (csk) {
+		log_debug(1 << CXGBI_DBG_SOCK,
+			"free csk 0x%p, state %u, flags 0x%lx\n",
+			csk, csk->state, csk->flags);
+		kfree(csk);
+	}
+}
+
+static inline void __cxgbi_sock_put(const char *fn, struct cxgbi_sock *csk)
+{
+	log_debug(1 << CXGBI_DBG_SOCK,
+		"%s, put csk 0x%p, ref %u-1.\n",
+		fn, csk, atomic_read(&csk->refcnt.refcount));
+	kref_put(&csk->refcnt, cxgbi_sock_free);
+}
+#define cxgbi_sock_put(csk)	__cxgbi_sock_put(__func__, csk)
+
+static inline void __cxgbi_sock_get(const char *fn, struct cxgbi_sock *csk)
+{
+	log_debug(1 << CXGBI_DBG_SOCK,
+		"%s, get csk 0x%p, ref %u+1.\n",
+		fn, csk, atomic_read(&csk->refcnt.refcount));
+	kref_get(&csk->refcnt);
+}
+#define cxgbi_sock_get(csk)	__cxgbi_sock_get(__func__, csk)
+
+static inline int cxgbi_sock_is_closing(struct cxgbi_sock *csk)
+{
+	return csk->state >= CTP_ACTIVE_CLOSE;
+}
+
+static inline int cxgbi_sock_is_established(struct cxgbi_sock *csk)
+{
+	return csk->state == CTP_ESTABLISHED;
+}
+
+static inline void cxgbi_sock_purge_write_queue(struct cxgbi_sock *csk)
+{
+	struct sk_buff *skb;
+
+	while ((skb = __skb_dequeue(&csk->write_queue)))
+		__kfree_skb(skb);
+}
+
+static inline unsigned int cxgbi_sock_compute_wscale(unsigned int win)
+{
+	unsigned int wscale = 0;
+
+	while (wscale < 14 && (65535 << wscale) < win)
+		wscale++;
+	return wscale;
+}
+
+static inline struct sk_buff *alloc_cpl(int cpl_len, int dlen, gfp_t gfp)
+{
+	int wrlen = roundup(cpl_len, 16);
+	struct sk_buff *skb = alloc_skb(wrlen + dlen, gfp);
+
+	if (skb) {
+		__skb_put(skb, wrlen);
+		memset(skb->head, 0, wrlen + dlen);
+	} else
+		pr_info("alloc cpl skb %u+%u, OOM.\n", cpl_len, dlen);
+	return skb;
+}
+
+
+/*
+ * The number of WRs needed for an skb depends on the number of fragments
+ * in the skb and whether it has any payload in its main body.  This maps the
+ * length of the gather list represented by an skb into the # of necessary WRs.
+ * The extra two fragments are for iscsi bhs and payload padding.
+ */
+#define SKB_WR_LIST_SIZE	 (MAX_SKB_FRAGS + 2)
+
+static inline void cxgbi_sock_reset_wr_list(struct cxgbi_sock *csk)
+{
+	csk->wr_pending_head = csk->wr_pending_tail = NULL;
+}
+
+static inline void cxgbi_sock_enqueue_wr(struct cxgbi_sock *csk,
+					  struct sk_buff *skb)
+{
+	cxgbi_skcb_tx_wr_next(skb) = NULL;
+	/*
+	 * We want to take an extra reference since both us and the driver
+	 * need to free the packet before it's really freed. We know there's
+	 * just one user currently so we use atomic_set rather than skb_get
+	 * to avoid the atomic op.
+	 */
+	atomic_set(&skb->users, 2);
+
+	if (!csk->wr_pending_head)
+		csk->wr_pending_head = skb;
+	else
+		cxgbi_skcb_tx_wr_next(csk->wr_pending_tail) = skb;
+	csk->wr_pending_tail = skb;
+}
+
+static inline int cxgbi_sock_count_pending_wrs(const struct cxgbi_sock *csk)
+{
+	int n = 0;
+	const struct sk_buff *skb = csk->wr_pending_head;
+
+	while (skb) {
+		n += skb->csum;
+		skb = cxgbi_skcb_tx_wr_next(skb);
+	}
+	return n;
+}
+
+static inline struct sk_buff *cxgbi_sock_peek_wr(const struct cxgbi_sock *csk)
+{
+	return csk->wr_pending_head;
+}
+
+static inline struct sk_buff *cxgbi_sock_dequeue_wr(struct cxgbi_sock *csk)
+{
+	struct sk_buff *skb = csk->wr_pending_head;
+
+	if (likely(skb)) {
+		csk->wr_pending_head = cxgbi_skcb_tx_wr_next(skb);
+		cxgbi_skcb_tx_wr_next(skb) = NULL;
+	}
+	return skb;
+}
+
+void cxgbi_sock_check_wr_invariants(const struct cxgbi_sock *);
+void cxgbi_sock_purge_wr_queue(struct cxgbi_sock *);
+void cxgbi_sock_skb_entail(struct cxgbi_sock *, struct sk_buff *);
+void cxgbi_sock_fail_act_open(struct cxgbi_sock *, int);
+void cxgbi_sock_act_open_req_arp_failure(void *, struct sk_buff *);
+void cxgbi_sock_closed(struct cxgbi_sock *);
+void cxgbi_sock_established(struct cxgbi_sock *, unsigned int, unsigned int);
+void cxgbi_sock_rcv_abort_rpl(struct cxgbi_sock *);
+void cxgbi_sock_rcv_peer_close(struct cxgbi_sock *);
+void cxgbi_sock_rcv_close_conn_rpl(struct cxgbi_sock *, u32);
+void cxgbi_sock_rcv_wr_ack(struct cxgbi_sock *, unsigned int, unsigned int,
+				int);
+unsigned int cxgbi_sock_select_mss(struct cxgbi_sock *, unsigned int);
+void cxgbi_sock_free_cpl_skbs(struct cxgbi_sock *);
+
+struct cxgbi_hba {
+	struct net_device *ndev;
+	struct Scsi_Host *shost;
+	struct cxgbi_device *cdev;
+	__be32 ipv4addr;
+	unsigned char port_id;
+};
+
+struct cxgbi_ports_map {
+	unsigned int max_connect;
+	unsigned int used;
+	unsigned short sport_base;
+	spinlock_t lock;
+	unsigned int next;
+	struct cxgbi_sock **port_csk;
+};
+
+#define CXGBI_FLAG_DEV_T3		0x1
+#define CXGBI_FLAG_DEV_T4		0x2
+#define CXGBI_FLAG_ADAPTER_RESET	0x4
+#define CXGBI_FLAG_IPV4_SET		0x10
+struct cxgbi_device {
+	struct list_head list_head;
+	unsigned int flags;
+	struct net_device **ports;
+	void *lldev;
+	struct cxgbi_hba **hbas;
+	const unsigned short *mtus;
+	unsigned char nmtus;
+	unsigned char nports;
+	struct pci_dev *pdev;
+	struct dentry *debugfs_root;
+	struct iscsi_transport *itp;
+
+	unsigned int pfvf;
+	unsigned int snd_win;
+	unsigned int rcv_win;
+	unsigned int rx_credit_thres;
+	unsigned int skb_tx_rsvd;
+	unsigned int skb_rx_extra;	/* for msg coalesced mode */
+	unsigned int tx_max_size;
+	unsigned int rx_max_size;
+	struct cxgbi_ports_map pmap;
+	struct cxgbi_tag_format tag_format;
+	struct cxgbi_ddp_info *ddp;
+
+	void (*dev_ddp_cleanup)(struct cxgbi_device *);
+	void (*csk_ddp_free_gl_skb)(struct cxgbi_ddp_info *, int, int);
+	int (*csk_ddp_alloc_gl_skb)(struct cxgbi_ddp_info *, int, int, gfp_t);
+	int (*csk_ddp_set)(struct cxgbi_sock *, struct cxgbi_pagepod_hdr *,
+				unsigned int, unsigned int,
+				struct cxgbi_gather_list *);
+	void (*csk_ddp_clear)(struct cxgbi_hba *,
+				unsigned int, unsigned int, unsigned int);
+	int (*csk_ddp_setup_digest)(struct cxgbi_sock *,
+				unsigned int, int, int, int);
+	int (*csk_ddp_setup_pgidx)(struct cxgbi_sock *,
+				unsigned int, int, bool);
+
+	void (*csk_release_offload_resources)(struct cxgbi_sock *);
+	int (*csk_rx_pdu_ready)(struct cxgbi_sock *, struct sk_buff *);
+	u32 (*csk_send_rx_credits)(struct cxgbi_sock *, u32);
+	int (*csk_push_tx_frames)(struct cxgbi_sock *, int);
+	void (*csk_send_abort_req)(struct cxgbi_sock *);
+	void (*csk_send_close_req)(struct cxgbi_sock *);
+	int (*csk_alloc_cpls)(struct cxgbi_sock *);
+	int (*csk_init_act_open)(struct cxgbi_sock *);
+
+	void *dd_data;
+};
+#define cxgbi_cdev_priv(cdev)	((cdev)->dd_data)
+
+struct cxgbi_conn {
+	struct cxgbi_endpoint *cep;
+	struct iscsi_conn *iconn;
+	struct cxgbi_hba *chba;
+	u32 task_idx_bits;
+};
+
+struct cxgbi_endpoint {
+	struct cxgbi_conn *cconn;
+	struct cxgbi_hba *chba;
+	struct cxgbi_sock *csk;
+};
+
+#define MAX_PDU_FRAGS	((ULP2_MAX_PDU_PAYLOAD + 512 - 1) / 512)
+struct cxgbi_task_data {
+	unsigned short nr_frags;
+	skb_frag_t frags[MAX_PDU_FRAGS];
+	struct sk_buff *skb;
+	unsigned int offset;
+	unsigned int count;
+	unsigned int sgoffset;
+};
+
+static inline int cxgbi_is_ddp_tag(struct cxgbi_tag_format *tformat, u32 tag)
+{
+	return !(tag & (1 << (tformat->rsvd_bits + tformat->rsvd_shift - 1)));
+}
+
+static inline int cxgbi_sw_tag_usable(struct cxgbi_tag_format *tformat,
+					u32 sw_tag)
+{
+	sw_tag >>= (32 - tformat->rsvd_bits);
+	return !sw_tag;
+}
+
+static inline u32 cxgbi_set_non_ddp_tag(struct cxgbi_tag_format *tformat,
+					u32 sw_tag)
+{
+	unsigned char shift = tformat->rsvd_bits + tformat->rsvd_shift - 1;
+	u32 mask = (1 << shift) - 1;
+
+	if (sw_tag && (sw_tag & ~mask)) {
+		u32 v1 = sw_tag & ((1 << shift) - 1);
+		u32 v2 = (sw_tag >> (shift - 1)) << shift;
+
+		return v2 | v1 | 1 << shift;
+	}
+
+	return sw_tag | 1 << shift;
+}
+
+static inline u32 cxgbi_ddp_tag_base(struct cxgbi_tag_format *tformat,
+					u32 sw_tag)
+{
+	u32 mask = (1 << tformat->rsvd_shift) - 1;
+
+	if (sw_tag && (sw_tag & ~mask)) {
+		u32 v1 = sw_tag & mask;
+		u32 v2 = sw_tag >> tformat->rsvd_shift;
+
+		v2 <<= tformat->rsvd_bits + tformat->rsvd_shift;
+
+		return v2 | v1;
+	}
+
+	return sw_tag;
+}
+
+static inline u32 cxgbi_tag_rsvd_bits(struct cxgbi_tag_format *tformat,
+					u32 tag)
+{
+	if (cxgbi_is_ddp_tag(tformat, tag))
+		return (tag >> tformat->rsvd_shift) & tformat->rsvd_mask;
+
+	return 0;
+}
+
+static inline u32 cxgbi_tag_nonrsvd_bits(struct cxgbi_tag_format *tformat,
+					u32 tag)
+{
+	unsigned char shift = tformat->rsvd_bits + tformat->rsvd_shift - 1;
+	u32 v1, v2;
+
+	if (cxgbi_is_ddp_tag(tformat, tag)) {
+		v1 = tag & ((1 << tformat->rsvd_shift) - 1);
+		v2 = (tag >> (shift + 1)) << tformat->rsvd_shift;
+	} else {
+		u32 mask = (1 << shift) - 1;
+		tag &= ~(1 << shift);
+		v1 = tag & mask;
+		v2 = (tag >> 1) & ~mask;
+	}
+	return v1 | v2;
+}
+
+static inline void *cxgbi_alloc_big_mem(unsigned int size,
+					gfp_t gfp)
+{
+	void *p = kmalloc(size, gfp);
+	if (!p)
+		p = vmalloc(size);
+	if (p)
+		memset(p, 0, size);
+	return p;
+}
+
+static inline void cxgbi_free_big_mem(void *addr)
+{
+	if (is_vmalloc_addr(addr))
+		vfree(addr);
+	else
+		kfree(addr);
+}
+
+static inline void cxgbi_set_iscsi_ipv4(struct cxgbi_hba *chba, __be32 ipaddr)
+{
+	if (chba->cdev->flags & CXGBI_FLAG_IPV4_SET)
+		chba->ipv4addr = ipaddr;
+	else
+		pr_info("set iscsi ipv4 NOT supported, using %s ipv4.\n",
+			chba->ndev->name);
+}
+
+static inline __be32 cxgbi_get_iscsi_ipv4(struct cxgbi_hba *chba)
+{
+	return chba->ipv4addr;
+}
+
+struct cxgbi_device *cxgbi_device_register(unsigned int, unsigned int);
+void cxgbi_device_unregister(struct cxgbi_device *);
+void cxgbi_device_unregister_all(unsigned int flag);
+struct cxgbi_device *cxgbi_device_find_by_lldev(void *);
+int cxgbi_hbas_add(struct cxgbi_device *, unsigned int, unsigned int,
+			struct scsi_host_template *,
+			struct scsi_transport_template *);
+void cxgbi_hbas_remove(struct cxgbi_device *);
+
+int cxgbi_device_portmap_create(struct cxgbi_device *cdev, unsigned int base,
+			unsigned int max_conn);
+void cxgbi_device_portmap_cleanup(struct cxgbi_device *cdev);
+
+void cxgbi_conn_tx_open(struct cxgbi_sock *);
+void cxgbi_conn_pdu_ready(struct cxgbi_sock *);
+int cxgbi_conn_alloc_pdu(struct iscsi_task *, u8);
+int cxgbi_conn_init_pdu(struct iscsi_task *, unsigned int , unsigned int);
+int cxgbi_conn_xmit_pdu(struct iscsi_task *);
+
+void cxgbi_cleanup_task(struct iscsi_task *task);
+
+void cxgbi_get_conn_stats(struct iscsi_cls_conn *, struct iscsi_stats *);
+int cxgbi_set_conn_param(struct iscsi_cls_conn *,
+			enum iscsi_param, char *, int);
+int cxgbi_get_conn_param(struct iscsi_cls_conn *, enum iscsi_param, char *);
+struct iscsi_cls_conn *cxgbi_create_conn(struct iscsi_cls_session *, u32);
+int cxgbi_bind_conn(struct iscsi_cls_session *,
+			struct iscsi_cls_conn *, u64, int);
+void cxgbi_destroy_session(struct iscsi_cls_session *);
+struct iscsi_cls_session *cxgbi_create_session(struct iscsi_endpoint *,
+			u16, u16, u32);
+int cxgbi_set_host_param(struct Scsi_Host *,
+			enum iscsi_host_param, char *, int);
+int cxgbi_get_host_param(struct Scsi_Host *, enum iscsi_host_param, char *);
+struct iscsi_endpoint *cxgbi_ep_connect(struct Scsi_Host *,
+			struct sockaddr *, int);
+int cxgbi_ep_poll(struct iscsi_endpoint *, int);
+void cxgbi_ep_disconnect(struct iscsi_endpoint *);
+
+int cxgbi_iscsi_init(struct iscsi_transport *,
+			struct scsi_transport_template **);
+void cxgbi_iscsi_cleanup(struct iscsi_transport *,
+			struct scsi_transport_template **);
+void cxgbi_parse_pdu_itt(struct iscsi_conn *, itt_t, int *, int *);
+int cxgbi_ddp_init(struct cxgbi_device *, unsigned int, unsigned int,
+			unsigned int, unsigned int);
+int cxgbi_ddp_cleanup(struct cxgbi_device *);
+void cxgbi_ddp_page_size_factor(int *);
+void cxgbi_ddp_ppod_clear(struct cxgbi_pagepod *);
+void cxgbi_ddp_ppod_set(struct cxgbi_pagepod *, struct cxgbi_pagepod_hdr *,
+			struct cxgbi_gather_list *, unsigned int);
+#endif	/*__LIBCXGBI_H__*/