1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Shared Memory Communications over RDMA (SMC-R) and RoCE 4 * 5 * Work Requests exploiting Infiniband API 6 * 7 * Copyright IBM Corp. 2016 8 * 9 * Author(s): Steffen Maier <maier@linux.vnet.ibm.com> 10 */ 11 12 #ifndef SMC_WR_H 13 #define SMC_WR_H 14 15 #include <linux/atomic.h> 16 #include <rdma/ib_verbs.h> 17 #include <asm/div64.h> 18 19 #include "smc.h" 20 #include "smc_core.h" 21 22 #define SMC_WR_BUF_CNT 16 /* # of ctrl buffers per link */ 23 24 #define SMC_WR_TX_WAIT_FREE_SLOT_TIME (10 * HZ) 25 26 #define SMC_WR_TX_SIZE 44 /* actual size of wr_send data (<=SMC_WR_BUF_SIZE) */ 27 28 #define SMC_WR_TX_PEND_PRIV_SIZE 32 29 30 struct smc_wr_tx_pend_priv { 31 u8 priv[SMC_WR_TX_PEND_PRIV_SIZE]; 32 }; 33 34 typedef void (*smc_wr_tx_handler)(struct smc_wr_tx_pend_priv *, 35 struct smc_link *, 36 enum ib_wc_status); 37 38 typedef bool (*smc_wr_tx_filter)(struct smc_wr_tx_pend_priv *, 39 unsigned long); 40 41 typedef void (*smc_wr_tx_dismisser)(struct smc_wr_tx_pend_priv *); 42 43 struct smc_wr_rx_handler { 44 struct hlist_node list; /* hash table collision resolution */ 45 void (*handler)(struct ib_wc *, void *); 46 u8 type; 47 }; 48 49 /* Only used by RDMA write WRs. 50 * All other WRs (CDC/LLC) use smc_wr_tx_send handling WR_ID implicitly 51 */ 52 static inline long smc_wr_tx_get_next_wr_id(struct smc_link *link) 53 { 54 return atomic_long_inc_return(&link->wr_tx_id); 55 } 56 57 static inline void smc_wr_tx_set_wr_id(atomic_long_t *wr_tx_id, long val) 58 { 59 atomic_long_set(wr_tx_id, val); 60 } 61 62 static inline bool smc_wr_tx_link_hold(struct smc_link *link) 63 { 64 if (!smc_link_sendable(link)) 65 return false; 66 atomic_inc(&link->wr_tx_refcnt); 67 return true; 68 } 69 70 static inline void smc_wr_tx_link_put(struct smc_link *link) 71 { 72 if (atomic_dec_and_test(&link->wr_tx_refcnt)) 73 wake_up_all(&link->wr_tx_wait); 74 } 75 76 static inline void smc_wr_drain_cq(struct smc_link *lnk) 77 { 78 wait_event(lnk->wr_rx_empty_wait, lnk->wr_rx_id_compl == lnk->wr_rx_id); 79 } 80 81 static inline void smc_wr_wakeup_tx_wait(struct smc_link *lnk) 82 { 83 wake_up_all(&lnk->wr_tx_wait); 84 } 85 86 static inline void smc_wr_wakeup_reg_wait(struct smc_link *lnk) 87 { 88 wake_up(&lnk->wr_reg_wait); 89 } 90 91 /* post a new receive work request to fill a completed old work request entry */ 92 static inline int smc_wr_rx_post(struct smc_link *link) 93 { 94 int rc; 95 u64 wr_id, temp_wr_id; 96 u32 index; 97 98 wr_id = ++link->wr_rx_id; /* tasklet context, thus not atomic */ 99 temp_wr_id = wr_id; 100 index = do_div(temp_wr_id, link->wr_rx_cnt); 101 link->wr_rx_ibs[index].wr_id = wr_id; 102 rc = ib_post_recv(link->roce_qp, &link->wr_rx_ibs[index], NULL); 103 return rc; 104 } 105 106 int smc_wr_create_link(struct smc_link *lnk); 107 int smc_wr_alloc_link_mem(struct smc_link *lnk); 108 int smc_wr_alloc_lgr_mem(struct smc_link_group *lgr); 109 void smc_wr_free_link(struct smc_link *lnk); 110 void smc_wr_free_link_mem(struct smc_link *lnk); 111 void smc_wr_free_lgr_mem(struct smc_link_group *lgr); 112 void smc_wr_remember_qp_attr(struct smc_link *lnk); 113 void smc_wr_remove_dev(struct smc_ib_device *smcibdev); 114 void smc_wr_add_dev(struct smc_ib_device *smcibdev); 115 116 int smc_wr_tx_get_free_slot(struct smc_link *link, smc_wr_tx_handler handler, 117 struct smc_wr_buf **wr_buf, 118 struct smc_rdma_wr **wrs, 119 struct smc_wr_tx_pend_priv **wr_pend_priv); 120 int smc_wr_tx_get_v2_slot(struct smc_link *link, 121 smc_wr_tx_handler handler, 122 struct smc_wr_v2_buf **wr_buf, 123 struct smc_wr_tx_pend_priv **wr_pend_priv); 124 int smc_wr_tx_put_slot(struct smc_link *link, 125 struct smc_wr_tx_pend_priv *wr_pend_priv); 126 int smc_wr_tx_send(struct smc_link *link, 127 struct smc_wr_tx_pend_priv *wr_pend_priv); 128 int smc_wr_tx_v2_send(struct smc_link *link, 129 struct smc_wr_tx_pend_priv *priv, int len); 130 int smc_wr_tx_send_wait(struct smc_link *link, struct smc_wr_tx_pend_priv *priv, 131 unsigned long timeout); 132 void smc_wr_tx_cq_handler(struct ib_cq *ib_cq, void *cq_context); 133 void smc_wr_tx_wait_no_pending_sends(struct smc_link *link); 134 135 int smc_wr_rx_register_handler(struct smc_wr_rx_handler *handler); 136 int smc_wr_rx_post_init(struct smc_link *link); 137 void smc_wr_rx_cq_handler(struct ib_cq *ib_cq, void *cq_context); 138 int smc_wr_reg_send(struct smc_link *link, struct ib_mr *mr); 139 140 #endif /* SMC_WR_H */ 141