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 <rdma/ib_verbs.h>
  18
  19 #define SMC_MAX_PORTS                   2       /* Max # of ports */
  20 #define SMC_GID_SIZE                    sizeof(union ib_gid)
  21
  22 #define SMC_IB_MAX_SEND_SGE             2
  23
  24 struct smc_ib_devices {                 /* list of smc ib devices definition */
  25         struct list_head        list;
  26         spinlock_t              lock;   /* protects list of smc ib devices */
  27 };
  28
  29 extern struct smc_ib_devices    smc_ib_devices; /* list of smc ib devices */
  30
  31 struct smc_ib_device {                          /* ib-device infos for smc */
  32         struct list_head        list;
  33         struct ib_device        *ibdev;
  34         struct ib_port_attr     pattr[SMC_MAX_PORTS];   /* ib dev. port attrs */
  35         struct ib_event_handler event_handler;  /* global ib_event handler */
  36         struct ib_cq            *roce_cq_send;  /* send completion queue */
  37         struct ib_cq            *roce_cq_recv;  /* recv completion queue */
  38         struct tasklet_struct   send_tasklet;   /* called by send cq handler */
  39         struct tasklet_struct   recv_tasklet;   /* called by recv cq handler */
  40         char                    mac[SMC_MAX_PORTS][ETH_ALEN];
  41                                                 /* mac address per port*/
  42         union ib_gid            gid[SMC_MAX_PORTS]; /* gid per port */
  43         u8                      initialized : 1; /* ib dev CQ, evthdl done */
  44         struct work_struct      port_event_work;
  45         unsigned long           port_event_mask;
  46 };
  47
  48 struct smc_buf_desc;
  49 struct smc_link;
  50
  51 int smc_ib_register_client(void) __init;
  52 void smc_ib_unregister_client(void);
  53 bool smc_ib_port_active(struct smc_ib_device *smcibdev, u8 ibport);
  54 int smc_ib_remember_port_attr(struct smc_ib_device *smcibdev, u8 ibport);
  55 int smc_ib_buf_map_sg(struct smc_ib_device *smcibdev,
  56                       struct smc_buf_desc *buf_slot,
  57                       enum dma_data_direction data_direction);
  58 void smc_ib_buf_unmap_sg(struct smc_ib_device *smcibdev,
  59                          struct smc_buf_desc *buf_slot,
  60                          enum dma_data_direction data_direction);
  61 void smc_ib_dealloc_protection_domain(struct smc_link *lnk);
  62 int smc_ib_create_protection_domain(struct smc_link *lnk);
  63 void smc_ib_destroy_queue_pair(struct smc_link *lnk);
  64 int smc_ib_create_queue_pair(struct smc_link *lnk);
  65 int smc_ib_ready_link(struct smc_link *lnk);
  66 int smc_ib_modify_qp_rts(struct smc_link *lnk);
  67 int smc_ib_modify_qp_reset(struct smc_link *lnk);
  68 long smc_ib_setup_per_ibdev(struct smc_ib_device *smcibdev);
  69 int smc_ib_get_memory_region(struct ib_pd *pd, int access_flags,
  70                              struct smc_buf_desc *buf_slot);
  71 void smc_ib_put_memory_region(struct ib_mr *mr);
  72 void smc_ib_sync_sg_for_cpu(struct smc_ib_device *smcibdev,
  73                             struct smc_buf_desc *buf_slot,
  74                             enum dma_data_direction data_direction);
  75 void smc_ib_sync_sg_for_device(struct smc_ib_device *smcibdev,
  76                                struct smc_buf_desc *buf_slot,
  77                                enum dma_data_direction data_direction);
  78 #endif