net/smc/smc_ib.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Shared Memory Communications over RDMA (SMC-R) and RoCE
   4  *
   5  *  Definitions for IB environment
   6  *
   7  *  Copyright IBM Corp. 2016
   8  *
   9  *  Author(s):  Ursula Braun <Ursula Braun@linux.vnet.ibm.com>
  10  */
  11
  12 #ifndef _SMC_IB_H
  13 #define _SMC_IB_H
  14
  15 #include <linux/interrupt.h>
  16 #include <linux/if_ether.h>
  17 #include <linux/mutex.h>
  18 #include <linux/wait.h>
  19 #include <rdma/ib_verbs.h>
  20 #include <net/smc.h>
  21
  22 #define SMC_MAX_PORTS                   2       /* Max # of ports */
  23 #define SMC_GID_SIZE                    sizeof(union ib_gid)
  24
  25 #define SMC_IB_MAX_SEND_SGE             2
  26
  27 struct smc_ib_devices {                 /* list of smc ib devices definition */
  28         struct list_head        list;
  29         struct mutex            mutex;  /* protects list of smc ib devices */
  30 };
  31
  32 extern struct smc_ib_devices    smc_ib_devices; /* list of smc ib devices */
  33
  34 struct smc_ib_device {                          /* ib-device infos for smc */
  35         struct list_head        list;
  36         struct ib_device        *ibdev;
  37         struct ib_port_attr     pattr[SMC_MAX_PORTS];   /* ib dev. port attrs */
  38         struct ib_event_handler event_handler;  /* global ib_event handler */
  39         struct ib_cq            *roce_cq_send;  /* send completion queue */
  40         struct ib_cq            *roce_cq_recv;  /* recv completion queue */
  41         struct tasklet_struct   send_tasklet;   /* called by send cq handler */
  42         struct tasklet_struct   recv_tasklet;   /* called by recv cq handler */
  43         char                    mac[SMC_MAX_PORTS][ETH_ALEN];
  44                                                 /* mac address per port*/
  45         u8                      pnetid[SMC_MAX_PORTS][SMC_MAX_PNETID_LEN];
  46                                                 /* pnetid per port */
  47         bool                    pnetid_by_user[SMC_MAX_PORTS];
  48                                                 /* pnetid defined by user? */
  49         u8                      initialized : 1; /* ib dev CQ, evthdl done */
  50         struct work_struct      port_event_work;
  51         unsigned long           port_event_mask;
  52         DECLARE_BITMAP(ports_going_away, SMC_MAX_PORTS);
  53         atomic_t                lnk_cnt;        /* number of links on ibdev */
  54         wait_queue_head_t       lnks_deleted;   /* wait 4 removal of all links*/
  55         struct mutex            mutex;          /* protect dev setup+cleanup */
  56 };
  57
  58 struct smc_buf_desc;
  59 struct smc_link;
  60
  61 int smc_ib_register_client(void) __init;
  62 void smc_ib_unregister_client(void);
  63 bool smc_ib_port_active(struct smc_ib_device *smcibdev, u8 ibport);
  64 int smc_ib_buf_map_sg(struct smc_link *lnk,
  65                       struct smc_buf_desc *buf_slot,
  66                       enum dma_data_direction data_direction);
  67 void smc_ib_buf_unmap_sg(struct smc_link *lnk,
  68                          struct smc_buf_desc *buf_slot,
  69                          enum dma_data_direction data_direction);
  70 void smc_ib_dealloc_protection_domain(struct smc_link *lnk);
  71 int smc_ib_create_protection_domain(struct smc_link *lnk);
  72 void smc_ib_destroy_queue_pair(struct smc_link *lnk);
  73 int smc_ib_create_queue_pair(struct smc_link *lnk);
  74 int smc_ib_ready_link(struct smc_link *lnk);
  75 int smc_ib_modify_qp_rts(struct smc_link *lnk);
  76 int smc_ib_modify_qp_reset(struct smc_link *lnk);
  77 long smc_ib_setup_per_ibdev(struct smc_ib_device *smcibdev);
  78 int smc_ib_get_memory_region(struct ib_pd *pd, int access_flags,
  79                              struct smc_buf_desc *buf_slot, u8 link_idx);
  80 void smc_ib_put_memory_region(struct ib_mr *mr);
  81 void smc_ib_sync_sg_for_cpu(struct smc_link *lnk,
  82                             struct smc_buf_desc *buf_slot,
  83                             enum dma_data_direction data_direction);
  84 void smc_ib_sync_sg_for_device(struct smc_link *lnk,
  85                                struct smc_buf_desc *buf_slot,
  86                                enum dma_data_direction data_direction);
  87 int smc_ib_determine_gid(struct smc_ib_device *smcibdev, u8 ibport,
  88                          unsigned short vlan_id, u8 gid[], u8 *sgid_index);
  89 bool smc_ib_is_valid_local_systemid(void);
  90 #endif