1/* SPDX-License-Identifier: GPL-2.0 */ 2/* 3 * Shared Memory Communications over RDMA (SMC-R) and RoCE 4 * 5 * Definitions for SMC Connections, Link Groups and Links 6 * 7 * Copyright IBM Corp. 2016 8 * 9 * Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com> 10 */ 11 12#ifndef _SMC_CORE_H 13#define _SMC_CORE_H 14 15#include <linux/atomic.h> 16#include <rdma/ib_verbs.h> 17 18#include "smc.h" 19#include "smc_ib.h" 20 21#define SMC_RMBS_PER_LGR_MAX 255 /* max. # of RMBs per link group */ 22 23struct smc_lgr_list { /* list of link group definition */ 24 struct list_head list; 25 spinlock_t lock; /* protects list of link groups */ 26}; 27 28extern struct smc_lgr_list smc_lgr_list; /* list of link groups */ 29 30enum smc_lgr_role { /* possible roles of a link group */ 31 SMC_CLNT, /* client */ 32 SMC_SERV /* server */ 33}; 34 35#define SMC_WR_BUF_SIZE 48 /* size of work request buffer */ 36 37struct smc_wr_buf { 38 u8 raw[SMC_WR_BUF_SIZE]; 39}; 40 41#define SMC_WR_REG_MR_WAIT_TIME (5 * HZ)/* wait time for ib_wr_reg_mr result */ 42 43enum smc_wr_reg_state { 44 POSTED, /* ib_wr_reg_mr request posted */ 45 CONFIRMED, /* ib_wr_reg_mr response: successful */ 46 FAILED /* ib_wr_reg_mr response: failure */ 47}; 48 49struct smc_link { 50 struct smc_ib_device *smcibdev; /* ib-device */ 51 u8 ibport; /* port - values 1 | 2 */ 52 struct ib_pd *roce_pd; /* IB protection domain, 53 * unique for every RoCE QP 54 */ 55 struct ib_qp *roce_qp; /* IB queue pair */ 56 struct ib_qp_attr qp_attr; /* IB queue pair attributes */ 57 58 struct smc_wr_buf *wr_tx_bufs; /* WR send payload buffers */ 59 struct ib_send_wr *wr_tx_ibs; /* WR send meta data */ 60 struct ib_sge *wr_tx_sges; /* WR send gather meta data */ 61 struct smc_wr_tx_pend *wr_tx_pends; /* WR send waiting for CQE */ 62 /* above four vectors have wr_tx_cnt elements and use the same index */ 63 dma_addr_t wr_tx_dma_addr; /* DMA address of wr_tx_bufs */ 64 atomic_long_t wr_tx_id; /* seq # of last sent WR */ 65 unsigned long *wr_tx_mask; /* bit mask of used indexes */ 66 u32 wr_tx_cnt; /* number of WR send buffers */ 67 wait_queue_head_t wr_tx_wait; /* wait for free WR send buf */ 68 69 struct smc_wr_buf *wr_rx_bufs; /* WR recv payload buffers */ 70 struct ib_recv_wr *wr_rx_ibs; /* WR recv meta data */ 71 struct ib_sge *wr_rx_sges; /* WR recv scatter meta data */ 72 /* above three vectors have wr_rx_cnt elements and use the same index */ 73 dma_addr_t wr_rx_dma_addr; /* DMA address of wr_rx_bufs */ 74 u64 wr_rx_id; /* seq # of last recv WR */ 75 u32 wr_rx_cnt; /* number of WR recv buffers */ 76 77 struct ib_reg_wr wr_reg; /* WR register memory region */ 78 wait_queue_head_t wr_reg_wait; /* wait for wr_reg result */ 79 enum smc_wr_reg_state wr_reg_state; /* state of wr_reg request */ 80 81 union ib_gid gid; /* gid matching used vlan id */ 82 u32 peer_qpn; /* QP number of peer */ 83 enum ib_mtu path_mtu; /* used mtu */ 84 enum ib_mtu peer_mtu; /* mtu size of peer */ 85 u32 psn_initial; /* QP tx initial packet seqno */ 86 u32 peer_psn; /* QP rx initial packet seqno */ 87 u8 peer_mac[ETH_ALEN]; /* = gid[8:10||13:15] */ 88 u8 peer_gid[sizeof(union ib_gid)]; /* gid of peer*/ 89 u8 link_id; /* unique # within link group */ 90 struct completion llc_confirm; /* wait for rx of conf link */ 91 struct completion llc_confirm_resp; /* wait 4 rx of cnf lnk rsp */ 92}; 93 94/* For now we just allow one parallel link per link group. The SMC protocol 95 * allows more (up to 8). 96 */ 97#define SMC_LINKS_PER_LGR_MAX 1 98#define SMC_SINGLE_LINK 0 99 100#define SMC_FIRST_CONTACT 1 /* first contact to a peer */ 101#define SMC_REUSE_CONTACT 0 /* follow-on contact to a peer*/ 102 103/* tx/rx buffer list element for sndbufs list and rmbs list of a lgr */ 104struct smc_buf_desc { 105 struct list_head list; 106 void *cpu_addr; /* virtual address of buffer */ 107 struct sg_table sgt[SMC_LINKS_PER_LGR_MAX];/* virtual buffer */ 108 struct ib_mr *mr_rx[SMC_LINKS_PER_LGR_MAX]; 109 /* for rmb only: memory region 110 * incl. rkey provided to peer 111 */ 112 u32 order; /* allocation order */ 113 u32 used; /* currently used / unused */ 114 bool reused; /* new created / reused */ 115}; 116 117struct smc_rtoken { /* address/key of remote RMB */ 118 u64 dma_addr; 119 u32 rkey; 120}; 121 122#define SMC_LGR_ID_SIZE 4 123 124struct smc_link_group { 125 struct list_head list; 126 enum smc_lgr_role role; /* client or server */ 127 __be32 daddr; /* destination ip address */ 128 struct smc_link lnk[SMC_LINKS_PER_LGR_MAX]; /* smc link */ 129 char peer_systemid[SMC_SYSTEMID_LEN]; 130 /* unique system_id of peer */ 131 struct rb_root conns_all; /* connection tree */ 132 rwlock_t conns_lock; /* protects conns_all */ 133 unsigned int conns_num; /* current # of connections */ 134 unsigned short vlan_id; /* vlan id of link group */ 135 136 struct list_head sndbufs[SMC_RMBE_SIZES];/* tx buffers */ 137 rwlock_t sndbufs_lock; /* protects tx buffers */ 138 struct list_head rmbs[SMC_RMBE_SIZES]; /* rx buffers */ 139 rwlock_t rmbs_lock; /* protects rx buffers */ 140 struct smc_rtoken rtokens[SMC_RMBS_PER_LGR_MAX] 141 [SMC_LINKS_PER_LGR_MAX]; 142 /* remote addr/key pairs */ 143 unsigned long rtokens_used_mask[BITS_TO_LONGS( 144 SMC_RMBS_PER_LGR_MAX)]; 145 /* used rtoken elements */ 146 147 u8 id[SMC_LGR_ID_SIZE]; /* unique lgr id */ 148 struct delayed_work free_work; /* delayed freeing of an lgr */ 149 bool sync_err; /* lgr no longer fits to peer */ 150}; 151 152/* Find the connection associated with the given alert token in the link group. 153 * To use rbtrees we have to implement our own search core. 154 * Requires @conns_lock 155 * @token alert token to search for 156 * @lgr link group to search in 157 * Returns connection associated with token if found, NULL otherwise. 158 */ 159static inline struct smc_connection *smc_lgr_find_conn( 160 u32 token, struct smc_link_group *lgr) 161{ 162 struct smc_connection *res = NULL; 163 struct rb_node *node; 164 165 node = lgr->conns_all.rb_node; 166 while (node) { 167 struct smc_connection *cur = rb_entry(node, 168 struct smc_connection, alert_node); 169 170 if (cur->alert_token_local > token) { 171 node = node->rb_left; 172 } else { 173 if (cur->alert_token_local < token) { 174 node = node->rb_right; 175 } else { 176 res = cur; 177 break; 178 } 179 } 180 } 181 182 return res; 183} 184 185struct smc_sock; 186struct smc_clc_msg_accept_confirm; 187 188void smc_lgr_free(struct smc_link_group *lgr); 189void smc_lgr_terminate(struct smc_link_group *lgr); 190int smc_buf_create(struct smc_sock *smc); 191int smc_rmb_rtoken_handling(struct smc_connection *conn, 192 struct smc_clc_msg_accept_confirm *clc); 193void smc_sndbuf_sync_sg_for_cpu(struct smc_connection *conn); 194void smc_sndbuf_sync_sg_for_device(struct smc_connection *conn); 195void smc_rmb_sync_sg_for_cpu(struct smc_connection *conn); 196void smc_rmb_sync_sg_for_device(struct smc_connection *conn); 197#endif 198