drivers/scsi/cxgb3i/cxgb3i.h

   1 /*
   2  * cxgb3i.h: Chelsio S3xx iSCSI driver.
   3  *
   4  * Copyright (c) 2008 Chelsio Communications, Inc.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation.
   9  *
  10  * Written by: Karen Xie (kxie@chelsio.com)
  11  */
  12
  13 #ifndef __CXGB3I_H__
  14 #define __CXGB3I_H__
  15
  16 #include <linux/module.h>
  17 #include <linux/moduleparam.h>
  18 #include <linux/errno.h>
  19 #include <linux/types.h>
  20 #include <linux/list.h>
  21 #include <linux/netdevice.h>
  22 #include <linux/scatterlist.h>
  23 #include <linux/skbuff.h>
  24 #include <scsi/libiscsi_tcp.h>
  25
  26 /* from cxgb3 LLD */
  27 #include "common.h"
  28 #include "t3_cpl.h"
  29 #include "t3cdev.h"
  30 #include "cxgb3_ctl_defs.h"
  31 #include "cxgb3_offload.h"
  32 #include "firmware_exports.h"
  33
  34 #include "cxgb3i_offload.h"
  35 #include "cxgb3i_ddp.h"
  36
  37 #define CXGB3I_SCSI_HOST_QDEPTH 1024
  38 #define CXGB3I_MAX_TARGET       CXGB3I_MAX_CONN
  39 #define CXGB3I_MAX_LUN          512
  40 #define ISCSI_PDU_NONPAYLOAD_MAX \
  41         (sizeof(struct iscsi_hdr) + ISCSI_MAX_AHS_SIZE + 2*ISCSI_DIGEST_SIZE)
  42
  43 struct cxgb3i_adapter;
  44 struct cxgb3i_hba;
  45 struct cxgb3i_endpoint;
  46
  47 /**
  48  * struct cxgb3i_hba - cxgb3i iscsi structure (per port)
  49  *
  50  * @snic:       cxgb3i adapter containing this port
  51  * @ndev:       pointer to netdev structure
  52  * @shost:      pointer to scsi host structure
  53  */
  54 struct cxgb3i_hba {
  55         struct cxgb3i_adapter *snic;
  56         struct net_device *ndev;
  57         struct Scsi_Host *shost;
  58 };
  59
  60 /**
  61  * struct cxgb3i_adapter - cxgb3i adapter structure (per pci)
  62  *
  63  * @listhead:   list head to link elements
  64  * @lock:       lock for this structure
  65  * @tdev:       pointer to t3cdev used by cxgb3 driver
  66  * @pdev:       pointer to pci dev
  67  * @hba_cnt:    # of hbas (the same as # of ports)
  68  * @hba:        all the hbas on this adapter
  69  * @flags:      bit flag for adapter event/status
  70  * @tx_max_size: max. tx packet size supported
  71  * @rx_max_size: max. rx packet size supported
  72  * @tag_format: ddp tag format settings
  73  */
  74 #define CXGB3I_ADAPTER_FLAG_RESET       0x1
  75 struct cxgb3i_adapter {
  76         struct list_head list_head;
  77         spinlock_t lock;
  78         struct t3cdev *tdev;
  79         struct pci_dev *pdev;
  80         unsigned char hba_cnt;
  81         struct cxgb3i_hba *hba[MAX_NPORTS];
  82
  83         unsigned int flags;
  84         unsigned int tx_max_size;
  85         unsigned int rx_max_size;
  86
  87         struct cxgb3i_tag_format tag_format;
  88 };
  89
  90 /**
  91  * struct cxgb3i_conn - cxgb3i iscsi connection
  92  *
  93  * @listhead:   list head to link elements
  94  * @cep:        pointer to iscsi_endpoint structure
  95  * @conn:       pointer to iscsi_conn structure
  96  * @hba:        pointer to the hba this conn. is going through
  97  * @task_idx_bits: # of bits needed for session->cmds_max
  98  */
  99 struct cxgb3i_conn {
 100         struct list_head list_head;
 101         struct cxgb3i_endpoint *cep;
 102         struct iscsi_conn *conn;
 103         struct cxgb3i_hba *hba;
 104         unsigned int task_idx_bits;
 105 };
 106
 107 /**
 108  * struct cxgb3i_endpoint - iscsi tcp endpoint
 109  *
 110  * @c3cn:       the h/w tcp connection representation
 111  * @hba:        pointer to the hba this conn. is going through
 112  * @cconn:      pointer to the associated cxgb3i iscsi connection
 113  */
 114 struct cxgb3i_endpoint {
 115         struct s3_conn *c3cn;
 116         struct cxgb3i_hba *hba;
 117         struct cxgb3i_conn *cconn;
 118 };
 119
 120 /**
 121  * struct cxgb3i_task_data - private iscsi task data
 122  *
 123  * @nr_frags:   # of coalesced page frags (from scsi sgl)
 124  * @frags:      coalesced page frags (from scsi sgl)
 125  * @skb:        tx pdu skb
 126  * @offset:     data offset for the next pdu
 127  * @count:      max. possible pdu payload
 128  * @sgoffset:   offset to the first sg entry for a given offset
 129  */
 130 #define MAX_PDU_FRAGS   ((ULP2_MAX_PDU_PAYLOAD + 512 - 1) / 512)
 131 struct cxgb3i_task_data {
 132         unsigned short nr_frags;
 133         skb_frag_t frags[MAX_PDU_FRAGS];
 134         struct sk_buff *skb;
 135         unsigned int offset;
 136         unsigned int count;
 137         unsigned int sgoffset;
 138 };
 139
 140 int cxgb3i_iscsi_init(void);
 141 void cxgb3i_iscsi_cleanup(void);
 142
 143 struct cxgb3i_adapter *cxgb3i_adapter_find_by_tdev(struct t3cdev *);
 144 void cxgb3i_adapter_open(struct t3cdev *);
 145 void cxgb3i_adapter_close(struct t3cdev *);
 146
 147 struct cxgb3i_hba *cxgb3i_hba_find_by_netdev(struct net_device *);
 148 struct cxgb3i_hba *cxgb3i_hba_host_add(struct cxgb3i_adapter *,
 149                                        struct net_device *);
 150 void cxgb3i_hba_host_remove(struct cxgb3i_hba *);
 151
 152 int cxgb3i_pdu_init(void);
 153 void cxgb3i_pdu_cleanup(void);
 154 void cxgb3i_conn_cleanup_task(struct iscsi_task *);
 155 int cxgb3i_conn_alloc_pdu(struct iscsi_task *, u8);
 156 int cxgb3i_conn_init_pdu(struct iscsi_task *, unsigned int, unsigned int);
 157 int cxgb3i_conn_xmit_pdu(struct iscsi_task *);
 158
 159 void cxgb3i_release_itt(struct iscsi_task *task, itt_t hdr_itt);
 160 int cxgb3i_reserve_itt(struct iscsi_task *task, itt_t *hdr_itt);
 161
 162 #endif