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 23 struct smc_lgr_list { /* list of link group definition */ 24 struct list_head list; 25 spinlock_t lock; /* protects list of link groups */ 26 }; 27 28 extern struct smc_lgr_list smc_lgr_list; /* list of link groups */ 29 30 enum smc_lgr_role { /* possible roles of a link group */ 31 SMC_CLNT, /* client */ 32 SMC_SERV /* server */ 33 }; 34 35 enum smc_link_state { /* possible states of a link */ 36 SMC_LNK_INACTIVE, /* link is inactive */ 37 SMC_LNK_ACTIVATING, /* link is being activated */ 38 SMC_LNK_ACTIVE /* link is active */ 39 }; 40 41 #define SMC_WR_BUF_SIZE 48 /* size of work request buffer */ 42 43 struct smc_wr_buf { 44 u8 raw[SMC_WR_BUF_SIZE]; 45 }; 46 47 #define SMC_WR_REG_MR_WAIT_TIME (5 * HZ)/* wait time for ib_wr_reg_mr result */ 48 49 enum smc_wr_reg_state { 50 POSTED, /* ib_wr_reg_mr request posted */ 51 CONFIRMED, /* ib_wr_reg_mr response: successful */ 52 FAILED /* ib_wr_reg_mr response: failure */ 53 }; 54 55 struct smc_link { 56 struct smc_ib_device *smcibdev; /* ib-device */ 57 u8 ibport; /* port - values 1 | 2 */ 58 struct ib_pd *roce_pd; /* IB protection domain, 59 * unique for every RoCE QP 60 */ 61 struct ib_qp *roce_qp; /* IB queue pair */ 62 struct ib_qp_attr qp_attr; /* IB queue pair attributes */ 63 64 struct smc_wr_buf *wr_tx_bufs; /* WR send payload buffers */ 65 struct ib_send_wr *wr_tx_ibs; /* WR send meta data */ 66 struct ib_sge *wr_tx_sges; /* WR send gather meta data */ 67 struct smc_wr_tx_pend *wr_tx_pends; /* WR send waiting for CQE */ 68 /* above four vectors have wr_tx_cnt elements and use the same index */ 69 dma_addr_t wr_tx_dma_addr; /* DMA address of wr_tx_bufs */ 70 atomic_long_t wr_tx_id; /* seq # of last sent WR */ 71 unsigned long *wr_tx_mask; /* bit mask of used indexes */ 72 u32 wr_tx_cnt; /* number of WR send buffers */ 73 wait_queue_head_t wr_tx_wait; /* wait for free WR send buf */ 74 75 struct smc_wr_buf *wr_rx_bufs; /* WR recv payload buffers */ 76 struct ib_recv_wr *wr_rx_ibs; /* WR recv meta data */ 77 struct ib_sge *wr_rx_sges; /* WR recv scatter meta data */ 78 /* above three vectors have wr_rx_cnt elements and use the same index */ 79 dma_addr_t wr_rx_dma_addr; /* DMA address of wr_rx_bufs */ 80 u64 wr_rx_id; /* seq # of last recv WR */ 81 u32 wr_rx_cnt; /* number of WR recv buffers */ 82 83 struct ib_reg_wr wr_reg; /* WR register memory region */ 84 wait_queue_head_t wr_reg_wait; /* wait for wr_reg result */ 85 enum smc_wr_reg_state wr_reg_state; /* state of wr_reg request */ 86 87 union ib_gid gid; /* gid matching used vlan id */ 88 u32 peer_qpn; /* QP number of peer */ 89 enum ib_mtu path_mtu; /* used mtu */ 90 enum ib_mtu peer_mtu; /* mtu size of peer */ 91 u32 psn_initial; /* QP tx initial packet seqno */ 92 u32 peer_psn; /* QP rx initial packet seqno */ 93 u8 peer_mac[ETH_ALEN]; /* = gid[8:10||13:15] */ 94 u8 peer_gid[sizeof(union ib_gid)]; /* gid of peer*/ 95 u8 link_id; /* unique # within link group */ 96 97 enum smc_link_state state; /* state of link */ 98 struct completion llc_confirm; /* wait for rx of conf link */ 99 struct completion llc_confirm_resp; /* wait 4 rx of cnf lnk rsp */ 100 int llc_confirm_rc; /* rc from confirm link msg */ 101 int llc_confirm_resp_rc; /* rc from conf_resp msg */ 102 struct completion llc_add; /* wait for rx of add link */ 103 struct completion llc_add_resp; /* wait for rx of add link rsp*/ 104 }; 105 106 /* For now we just allow one parallel link per link group. The SMC protocol 107 * allows more (up to 8). 108 */ 109 #define SMC_LINKS_PER_LGR_MAX 1 110 #define SMC_SINGLE_LINK 0 111 112 #define SMC_FIRST_CONTACT 1 /* first contact to a peer */ 113 #define SMC_REUSE_CONTACT 0 /* follow-on contact to a peer*/ 114 115 /* tx/rx buffer list element for sndbufs list and rmbs list of a lgr */ 116 struct smc_buf_desc { 117 struct list_head list; 118 void *cpu_addr; /* virtual address of buffer */ 119 struct sg_table sgt[SMC_LINKS_PER_LGR_MAX];/* virtual buffer */ 120 struct ib_mr *mr_rx[SMC_LINKS_PER_LGR_MAX]; 121 /* for rmb only: memory region 122 * incl. rkey provided to peer 123 */ 124 u32 order; /* allocation order */ 125 u32 used; /* currently used / unused */ 126 bool reused; /* new created / reused */ 127 }; 128 129 struct smc_rtoken { /* address/key of remote RMB */ 130 u64 dma_addr; 131 u32 rkey; 132 }; 133 134 #define SMC_LGR_ID_SIZE 4 135 136 struct smc_link_group { 137 struct list_head list; 138 enum smc_lgr_role role; /* client or server */ 139 struct smc_link lnk[SMC_LINKS_PER_LGR_MAX]; /* smc link */ 140 char peer_systemid[SMC_SYSTEMID_LEN]; 141 /* unique system_id of peer */ 142 struct rb_root conns_all; /* connection tree */ 143 rwlock_t conns_lock; /* protects conns_all */ 144 unsigned int conns_num; /* current # of connections */ 145 unsigned short vlan_id; /* vlan id of link group */ 146 147 struct list_head sndbufs[SMC_RMBE_SIZES];/* tx buffers */ 148 rwlock_t sndbufs_lock; /* protects tx buffers */ 149 struct list_head rmbs[SMC_RMBE_SIZES]; /* rx buffers */ 150 rwlock_t rmbs_lock; /* protects rx buffers */ 151 struct smc_rtoken rtokens[SMC_RMBS_PER_LGR_MAX] 152 [SMC_LINKS_PER_LGR_MAX]; 153 /* remote addr/key pairs */ 154 unsigned long rtokens_used_mask[BITS_TO_LONGS( 155 SMC_RMBS_PER_LGR_MAX)]; 156 /* used rtoken elements */ 157 158 u8 id[SMC_LGR_ID_SIZE]; /* unique lgr id */ 159 struct delayed_work free_work; /* delayed freeing of an lgr */ 160 bool sync_err; /* lgr no longer fits to peer */ 161 }; 162 163 /* Find the connection associated with the given alert token in the link group. 164 * To use rbtrees we have to implement our own search core. 165 * Requires @conns_lock 166 * @token alert token to search for 167 * @lgr link group to search in 168 * Returns connection associated with token if found, NULL otherwise. 169 */ 170 static inline struct smc_connection *smc_lgr_find_conn( 171 u32 token, struct smc_link_group *lgr) 172 { 173 struct smc_connection *res = NULL; 174 struct rb_node *node; 175 176 node = lgr->conns_all.rb_node; 177 while (node) { 178 struct smc_connection *cur = rb_entry(node, 179 struct smc_connection, alert_node); 180 181 if (cur->alert_token_local > token) { 182 node = node->rb_left; 183 } else { 184 if (cur->alert_token_local < token) { 185 node = node->rb_right; 186 } else { 187 res = cur; 188 break; 189 } 190 } 191 } 192 193 return res; 194 } 195 196 struct smc_sock; 197 struct smc_clc_msg_accept_confirm; 198 199 void smc_lgr_free(struct smc_link_group *lgr); 200 void smc_lgr_forget(struct smc_link_group *lgr); 201 void smc_lgr_terminate(struct smc_link_group *lgr); 202 int smc_buf_create(struct smc_sock *smc); 203 int smc_rmb_rtoken_handling(struct smc_connection *conn, 204 struct smc_clc_msg_accept_confirm *clc); 205 int smc_rtoken_add(struct smc_link_group *lgr, __be64 nw_vaddr, __be32 nw_rkey); 206 int smc_rtoken_delete(struct smc_link_group *lgr, __be32 nw_rkey); 207 void smc_sndbuf_sync_sg_for_cpu(struct smc_connection *conn); 208 void smc_sndbuf_sync_sg_for_device(struct smc_connection *conn); 209 void smc_rmb_sync_sg_for_cpu(struct smc_connection *conn); 210 void smc_rmb_sync_sg_for_device(struct smc_connection *conn); 211 #endif 212