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_MAX_CQE 32768 /* max. # of completion queue elements */ 23 #define SMC_WR_BUF_CNT 16 /* # of ctrl buffers per link */ 24 25 #define SMC_WR_TX_WAIT_FREE_SLOT_TIME (10 * HZ) 26 #define SMC_WR_TX_WAIT_PENDING_TIME (5 * HZ) 27 28 #define SMC_WR_TX_SIZE 44 /* actual size of wr_send data (<=SMC_WR_BUF_SIZE) */ 29 30 #define SMC_WR_TX_PEND_PRIV_SIZE 32 31 32 struct smc_wr_tx_pend_priv { 33 u8 priv[SMC_WR_TX_PEND_PRIV_SIZE]; 34 }; 35 36 typedef void (*smc_wr_tx_handler)(struct smc_wr_tx_pend_priv *, 37 struct smc_link *, 38 enum ib_wc_status); 39 40 typedef bool (*smc_wr_tx_filter)(struct smc_wr_tx_pend_priv *, 41 unsigned long); 42 43 typedef void (*smc_wr_tx_dismisser)(struct smc_wr_tx_pend_priv *); 44 45 struct smc_wr_rx_handler { 46 struct hlist_node list; /* hash table collision resolution */ 47 void (*handler)(struct ib_wc *, void *); 48 u8 type; 49 }; 50 51 /* Only used by RDMA write WRs. 52 * All other WRs (CDC/LLC) use smc_wr_tx_send handling WR_ID implicitly 53 */ 54 static inline long smc_wr_tx_get_next_wr_id(struct smc_link *link) 55 { 56 return atomic_long_inc_return(&link->wr_tx_id); 57 } 58 59 static inline void smc_wr_tx_set_wr_id(atomic_long_t *wr_tx_id, long val) 60 { 61 atomic_long_set(wr_tx_id, val); 62 } 63 64 /* post a new receive work request to fill a completed old work request entry */ 65 static inline int smc_wr_rx_post(struct smc_link *link) 66 { 67 struct ib_recv_wr *bad_recv_wr = NULL; 68 int rc; 69 u64 wr_id, temp_wr_id; 70 u32 index; 71 72 wr_id = ++link->wr_rx_id; /* tasklet context, thus not atomic */ 73 temp_wr_id = wr_id; 74 index = do_div(temp_wr_id, link->wr_rx_cnt); 75 link->wr_rx_ibs[index].wr_id = wr_id; 76 rc = ib_post_recv(link->roce_qp, &link->wr_rx_ibs[index], &bad_recv_wr); 77 return rc; 78 } 79 80 int smc_wr_create_link(struct smc_link *lnk); 81 int smc_wr_alloc_link_mem(struct smc_link *lnk); 82 void smc_wr_free_link(struct smc_link *lnk); 83 void smc_wr_free_link_mem(struct smc_link *lnk); 84 void smc_wr_remember_qp_attr(struct smc_link *lnk); 85 void smc_wr_remove_dev(struct smc_ib_device *smcibdev); 86 void smc_wr_add_dev(struct smc_ib_device *smcibdev); 87 88 int smc_wr_tx_get_free_slot(struct smc_link *link, smc_wr_tx_handler handler, 89 struct smc_wr_buf **wr_buf, 90 struct smc_wr_tx_pend_priv **wr_pend_priv); 91 int smc_wr_tx_put_slot(struct smc_link *link, 92 struct smc_wr_tx_pend_priv *wr_pend_priv); 93 int smc_wr_tx_send(struct smc_link *link, 94 struct smc_wr_tx_pend_priv *wr_pend_priv); 95 void smc_wr_tx_cq_handler(struct ib_cq *ib_cq, void *cq_context); 96 void smc_wr_tx_dismiss_slots(struct smc_link *lnk, u8 wr_rx_hdr_type, 97 smc_wr_tx_filter filter, 98 smc_wr_tx_dismisser dismisser, 99 unsigned long data); 100 101 int smc_wr_rx_register_handler(struct smc_wr_rx_handler *handler); 102 int smc_wr_rx_post_init(struct smc_link *link); 103 void smc_wr_rx_cq_handler(struct ib_cq *ib_cq, void *cq_context); 104 int smc_wr_reg_send(struct smc_link *link, struct ib_mr *mr); 105 106 #endif /* SMC_WR_H */ 107