[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__*/