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