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_TX_WAIT_FREE_SLOT_TIME (10 * HZ) 23 24 #define SMC_WR_TX_SIZE 44 /* actual size of wr_send data (<=SMC_WR_BUF_SIZE) */ 25 26 #define SMC_WR_TX_PEND_PRIV_SIZE 32 27 28 struct smc_wr_tx_pend_priv { 29 u8 priv[SMC_WR_TX_PEND_PRIV_SIZE]; 30 }; 31 32 typedef void (*smc_wr_tx_handler)(struct smc_wr_tx_pend_priv *, 33 struct smc_link *, 34 enum ib_wc_status); 35 36 typedef bool (*smc_wr_tx_filter)(struct smc_wr_tx_pend_priv *, 37 unsigned long); 38 39 typedef void (*smc_wr_tx_dismisser)(struct smc_wr_tx_pend_priv *); 40 41 struct smc_wr_rx_handler { 42 struct hlist_node list; /* hash table collision resolution */ 43 void (*handler)(struct ib_wc *, void *); 44 u8 type; 45 }; 46 47 /* Only used by RDMA write WRs. 48 * All other WRs (CDC/LLC) use smc_wr_tx_send handling WR_ID implicitly 49 */ 50 static inline long smc_wr_tx_get_next_wr_id(struct smc_link *link) 51 { 52 return atomic_long_inc_return(&link->wr_tx_id); 53 } 54 55 static inline void smc_wr_tx_set_wr_id(atomic_long_t *wr_tx_id, long val) 56 { 57 atomic_long_set(wr_tx_id, val); 58 } 59 60 static inline bool smc_wr_tx_link_hold(struct smc_link *link) 61 { 62 if (!smc_link_sendable(link)) 63 return false; 64 percpu_ref_get(&link->wr_tx_refs); 65 return true; 66 } 67 68 static inline void smc_wr_tx_link_put(struct smc_link *link) 69 { 70 percpu_ref_put(&link->wr_tx_refs); 71 } 72 73 static inline void smc_wr_drain_cq(struct smc_link *lnk) 74 { 75 wait_event(lnk->wr_rx_empty_wait, lnk->wr_rx_id_compl == lnk->wr_rx_id); 76 } 77 78 static inline void smc_wr_wakeup_tx_wait(struct smc_link *lnk) 79 { 80 wake_up_all(&lnk->wr_tx_wait); 81 } 82 83 static inline void smc_wr_wakeup_reg_wait(struct smc_link *lnk) 84 { 85 wake_up(&lnk->wr_reg_wait); 86 } 87 88 /* post a new receive work request to fill a completed old work request entry */ 89 static inline int smc_wr_rx_post(struct smc_link *link) 90 { 91 int rc; 92 u64 wr_id, temp_wr_id; 93 u32 index; 94 95 wr_id = ++link->wr_rx_id; /* tasklet context, thus not atomic */ 96 temp_wr_id = wr_id; 97 index = do_div(temp_wr_id, link->wr_rx_cnt); 98 link->wr_rx_ibs[index].wr_id = wr_id; 99 rc = ib_post_recv(link->roce_qp, &link->wr_rx_ibs[index], NULL); 100 return rc; 101 } 102 103 int smc_wr_create_link(struct smc_link *lnk); 104 int smc_wr_alloc_link_mem(struct smc_link *lnk); 105 int smc_wr_alloc_lgr_mem(struct smc_link_group *lgr); 106 void smc_wr_free_link(struct smc_link *lnk); 107 void smc_wr_free_link_mem(struct smc_link *lnk); 108 void smc_wr_free_lgr_mem(struct smc_link_group *lgr); 109 void smc_wr_remember_qp_attr(struct smc_link *lnk); 110 void smc_wr_remove_dev(struct smc_ib_device *smcibdev); 111 void smc_wr_add_dev(struct smc_ib_device *smcibdev); 112 113 int smc_wr_tx_get_free_slot(struct smc_link *link, smc_wr_tx_handler handler, 114 struct smc_wr_buf **wr_buf, 115 struct smc_rdma_wr **wrs, 116 struct smc_wr_tx_pend_priv **wr_pend_priv); 117 int smc_wr_tx_get_v2_slot(struct smc_link *link, 118 smc_wr_tx_handler handler, 119 struct smc_wr_v2_buf **wr_buf, 120 struct smc_wr_tx_pend_priv **wr_pend_priv); 121 int smc_wr_tx_put_slot(struct smc_link *link, 122 struct smc_wr_tx_pend_priv *wr_pend_priv); 123 int smc_wr_tx_send(struct smc_link *link, 124 struct smc_wr_tx_pend_priv *wr_pend_priv); 125 int smc_wr_tx_v2_send(struct smc_link *link, 126 struct smc_wr_tx_pend_priv *priv, int len); 127 int smc_wr_tx_send_wait(struct smc_link *link, struct smc_wr_tx_pend_priv *priv, 128 unsigned long timeout); 129 void smc_wr_tx_cq_handler(struct ib_cq *ib_cq, void *cq_context); 130 void smc_wr_tx_wait_no_pending_sends(struct smc_link *link); 131 132 int smc_wr_rx_register_handler(struct smc_wr_rx_handler *handler); 133 int smc_wr_rx_post_init(struct smc_link *link); 134 void smc_wr_rx_cq_handler(struct ib_cq *ib_cq, void *cq_context); 135 int smc_wr_reg_send(struct smc_link *link, struct ib_mr *mr); 136 137 #endif /* SMC_WR_H */ 138