drivers/net/ethernet/chelsio/cxgb4/cxgb4_uld.h

   1 /*
   2  * This file is part of the Chelsio T4 Ethernet driver for Linux.
   3  *
   4  * Copyright (c) 2003-2010 Chelsio Communications, Inc. All rights reserved.
   5  *
   6  * This software is available to you under a choice of one of two
   7  * licenses.  You may choose to be licensed under the terms of the GNU
   8  * General Public License (GPL) Version 2, available from the file
   9  * COPYING in the main directory of this source tree, or the
  10  * OpenIB.org BSD license below:
  11  *
  12  *     Redistribution and use in source and binary forms, with or
  13  *     without modification, are permitted provided that the following
  14  *     conditions are met:
  15  *
  16  *      - Redistributions of source code must retain the above
  17  *        copyright notice, this list of conditions and the following
  18  *        disclaimer.
  19  *
  20  *      - Redistributions in binary form must reproduce the above
  21  *        copyright notice, this list of conditions and the following
  22  *        disclaimer in the documentation and/or other materials
  23  *        provided with the distribution.
  24  *
  25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  26  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  27  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  28  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  29  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  30  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  31  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  32  * SOFTWARE.
  33  */
  34
  35 #ifndef __CXGB4_OFLD_H
  36 #define __CXGB4_OFLD_H
  37
  38 #include <linux/cache.h>
  39 #include <linux/spinlock.h>
  40 #include <linux/skbuff.h>
  41 #include <linux/inetdevice.h>
  42 #include <linux/atomic.h>
  43
  44 /* CPL message priority levels */
  45 enum {
  46         CPL_PRIORITY_DATA     = 0,  /* data messages */
  47         CPL_PRIORITY_SETUP    = 1,  /* connection setup messages */
  48         CPL_PRIORITY_TEARDOWN = 0,  /* connection teardown messages */
  49         CPL_PRIORITY_LISTEN   = 1,  /* listen start/stop messages */
  50         CPL_PRIORITY_ACK      = 1,  /* RX ACK messages */
  51         CPL_PRIORITY_CONTROL  = 1   /* control messages */
  52 };
  53
  54 #define INIT_TP_WR(w, tid) do { \
  55         (w)->wr.wr_hi = htonl(FW_WR_OP(FW_TP_WR) | \
  56                               FW_WR_IMMDLEN(sizeof(*w) - sizeof(w->wr))); \
  57         (w)->wr.wr_mid = htonl(FW_WR_LEN16(DIV_ROUND_UP(sizeof(*w), 16)) | \
  58                                FW_WR_FLOWID(tid)); \
  59         (w)->wr.wr_lo = cpu_to_be64(0); \
  60 } while (0)
  61
  62 #define INIT_TP_WR_CPL(w, cpl, tid) do { \
  63         INIT_TP_WR(w, tid); \
  64         OPCODE_TID(w) = htonl(MK_OPCODE_TID(cpl, tid)); \
  65 } while (0)
  66
  67 #define INIT_ULPTX_WR(w, wrlen, atomic, tid) do { \
  68         (w)->wr.wr_hi = htonl(FW_WR_OP(FW_ULPTX_WR) | FW_WR_ATOMIC(atomic)); \
  69         (w)->wr.wr_mid = htonl(FW_WR_LEN16(DIV_ROUND_UP(wrlen, 16)) | \
  70                                FW_WR_FLOWID(tid)); \
  71         (w)->wr.wr_lo = cpu_to_be64(0); \
  72 } while (0)
  73
  74 /* Special asynchronous notification message */
  75 #define CXGB4_MSG_AN ((void *)1)
  76
  77 struct serv_entry {
  78         void *data;
  79 };
  80
  81 union aopen_entry {
  82         void *data;
  83         union aopen_entry *next;
  84 };
  85
  86 /*
  87  * Holds the size, base address, free list start, etc of the TID, server TID,
  88  * and active-open TID tables.  The tables themselves are allocated dynamically.
  89  */
  90 struct tid_info {
  91         void **tid_tab;
  92         unsigned int ntids;
  93
  94         struct serv_entry *stid_tab;
  95         unsigned long *stid_bmap;
  96         unsigned int nstids;
  97         unsigned int stid_base;
  98
  99         union aopen_entry *atid_tab;
 100         unsigned int natids;
 101         unsigned int atid_base;
 102
 103         struct filter_entry *ftid_tab;
 104         unsigned int nftids;
 105         unsigned int ftid_base;
 106         unsigned int aftid_base;
 107         unsigned int aftid_end;
 108         /* Server filter region */
 109         unsigned int sftid_base;
 110         unsigned int nsftids;
 111
 112         spinlock_t atid_lock ____cacheline_aligned_in_smp;
 113         union aopen_entry *afree;
 114         unsigned int atids_in_use;
 115
 116         spinlock_t stid_lock;
 117         unsigned int stids_in_use;
 118
 119         atomic_t tids_in_use;
 120 };
 121
 122 static inline void *lookup_tid(const struct tid_info *t, unsigned int tid)
 123 {
 124         return tid < t->ntids ? t->tid_tab[tid] : NULL;
 125 }
 126
 127 static inline void *lookup_atid(const struct tid_info *t, unsigned int atid)
 128 {
 129         return atid < t->natids ? t->atid_tab[atid].data : NULL;
 130 }
 131
 132 static inline void *lookup_stid(const struct tid_info *t, unsigned int stid)
 133 {
 134         /* Is it a server filter TID? */
 135         if (t->nsftids && (stid >= t->sftid_base)) {
 136                 stid -= t->sftid_base;
 137                 stid += t->nstids;
 138         } else {
 139                 stid -= t->stid_base;
 140         }
 141
 142         return stid < (t->nstids + t->nsftids) ? t->stid_tab[stid].data : NULL;
 143 }
 144
 145 static inline void cxgb4_insert_tid(struct tid_info *t, void *data,
 146                                     unsigned int tid)
 147 {
 148         t->tid_tab[tid] = data;
 149         atomic_inc(&t->tids_in_use);
 150 }
 151
 152 int cxgb4_alloc_atid(struct tid_info *t, void *data);
 153 int cxgb4_alloc_stid(struct tid_info *t, int family, void *data);
 154 int cxgb4_alloc_sftid(struct tid_info *t, int family, void *data);
 155 void cxgb4_free_atid(struct tid_info *t, unsigned int atid);
 156 void cxgb4_free_stid(struct tid_info *t, unsigned int stid, int family);
 157 void cxgb4_remove_tid(struct tid_info *t, unsigned int qid, unsigned int tid);
 158
 159 struct in6_addr;
 160
 161 int cxgb4_create_server(const struct net_device *dev, unsigned int stid,
 162                         __be32 sip, __be16 sport, __be16 vlan,
 163                         unsigned int queue);
 164 int cxgb4_create_server6(const struct net_device *dev, unsigned int stid,
 165                          const struct in6_addr *sip, __be16 sport,
 166                          unsigned int queue);
 167 int cxgb4_remove_server(const struct net_device *dev, unsigned int stid,
 168                         unsigned int queue, bool ipv6);
 169 int cxgb4_create_server_filter(const struct net_device *dev, unsigned int stid,
 170                                __be32 sip, __be16 sport, __be16 vlan,
 171                                unsigned int queue,
 172                                unsigned char port, unsigned char mask);
 173 int cxgb4_remove_server_filter(const struct net_device *dev, unsigned int stid,
 174                                unsigned int queue, bool ipv6);
 175 static inline void set_wr_txq(struct sk_buff *skb, int prio, int queue)
 176 {
 177         skb_set_queue_mapping(skb, (queue << 1) | prio);
 178 }
 179
 180 enum cxgb4_uld {
 181         CXGB4_ULD_RDMA,
 182         CXGB4_ULD_ISCSI,
 183         CXGB4_ULD_MAX
 184 };
 185
 186 enum cxgb4_state {
 187         CXGB4_STATE_UP,
 188         CXGB4_STATE_START_RECOVERY,
 189         CXGB4_STATE_DOWN,
 190         CXGB4_STATE_DETACH
 191 };
 192
 193 enum cxgb4_control {
 194         CXGB4_CONTROL_DB_FULL,
 195         CXGB4_CONTROL_DB_EMPTY,
 196         CXGB4_CONTROL_DB_DROP,
 197 };
 198
 199 struct pci_dev;
 200 struct l2t_data;
 201 struct net_device;
 202 struct pkt_gl;
 203 struct tp_tcp_stats;
 204
 205 struct cxgb4_range {
 206         unsigned int start;
 207         unsigned int size;
 208 };
 209
 210 struct cxgb4_virt_res {                      /* virtualized HW resources */
 211         struct cxgb4_range ddp;
 212         struct cxgb4_range iscsi;
 213         struct cxgb4_range stag;
 214         struct cxgb4_range rq;
 215         struct cxgb4_range pbl;
 216         struct cxgb4_range qp;
 217         struct cxgb4_range cq;
 218         struct cxgb4_range ocq;
 219 };
 220
 221 #define OCQ_WIN_OFFSET(pdev, vres) \
 222         (pci_resource_len((pdev), 2) - roundup_pow_of_two((vres)->ocq.size))
 223
 224 /*
 225  * Block of information the LLD provides to ULDs attaching to a device.
 226  */
 227 struct cxgb4_lld_info {
 228         struct pci_dev *pdev;                /* associated PCI device */
 229         struct l2t_data *l2t;                /* L2 table */
 230         struct tid_info *tids;               /* TID table */
 231         struct net_device **ports;           /* device ports */
 232         const struct cxgb4_virt_res *vr;     /* assorted HW resources */
 233         const unsigned short *mtus;          /* MTU table */
 234         const unsigned short *rxq_ids;       /* the ULD's Rx queue ids */
 235         unsigned short nrxq;                 /* # of Rx queues */
 236         unsigned short ntxq;                 /* # of Tx queues */
 237         unsigned char nchan:4;               /* # of channels */
 238         unsigned char nports:4;              /* # of ports */
 239         unsigned char wr_cred;               /* WR 16-byte credits */
 240         unsigned char adapter_type;          /* type of adapter */
 241         unsigned char fw_api_ver;            /* FW API version */
 242         unsigned int fw_vers;                /* FW version */
 243         unsigned int iscsi_iolen;            /* iSCSI max I/O length */
 244         unsigned short udb_density;          /* # of user DB/page */
 245         unsigned short ucq_density;          /* # of user CQs/page */
 246         unsigned short filt_mode;            /* filter optional components */
 247         unsigned short tx_modq[NCHAN];       /* maps each tx channel to a */
 248                                              /* scheduler queue */
 249         void __iomem *gts_reg;               /* address of GTS register */
 250         void __iomem *db_reg;                /* address of kernel doorbell */
 251         int dbfifo_int_thresh;               /* doorbell fifo int threshold */
 252         unsigned int sge_pktshift;           /* Padding between CPL and */
 253                                              /* packet data */
 254         bool enable_fw_ofld_conn;            /* Enable connection through fw */
 255                                              /* WR */
 256 };
 257
 258 struct cxgb4_uld_info {
 259         const char *name;
 260         void *(*add)(const struct cxgb4_lld_info *p);
 261         int (*rx_handler)(void *handle, const __be64 *rsp,
 262                           const struct pkt_gl *gl);
 263         int (*state_change)(void *handle, enum cxgb4_state new_state);
 264         int (*control)(void *handle, enum cxgb4_control control, ...);
 265 };
 266
 267 int cxgb4_register_uld(enum cxgb4_uld type, const struct cxgb4_uld_info *p);
 268 int cxgb4_unregister_uld(enum cxgb4_uld type);
 269 int cxgb4_ofld_send(struct net_device *dev, struct sk_buff *skb);
 270 unsigned int cxgb4_dbfifo_count(const struct net_device *dev, int lpfifo);
 271 unsigned int cxgb4_port_chan(const struct net_device *dev);
 272 unsigned int cxgb4_port_viid(const struct net_device *dev);
 273 unsigned int cxgb4_port_idx(const struct net_device *dev);
 274 unsigned int cxgb4_best_mtu(const unsigned short *mtus, unsigned short mtu,
 275                             unsigned int *idx);
 276 void cxgb4_get_tcp_stats(struct pci_dev *pdev, struct tp_tcp_stats *v4,
 277                          struct tp_tcp_stats *v6);
 278 void cxgb4_iscsi_init(struct net_device *dev, unsigned int tag_mask,
 279                       const unsigned int *pgsz_order);
 280 struct sk_buff *cxgb4_pktgl_to_skb(const struct pkt_gl *gl,
 281                                    unsigned int skb_len, unsigned int pull_len);
 282 int cxgb4_sync_txq_pidx(struct net_device *dev, u16 qid, u16 pidx, u16 size);
 283 int cxgb4_flush_eq_cache(struct net_device *dev);
 284 void cxgb4_disable_db_coalescing(struct net_device *dev);
 285 void cxgb4_enable_db_coalescing(struct net_device *dev);
 286
 287 #endif  /* !__CXGB4_OFLD_H */