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 30struct smc_wr_tx_pend_priv { 31 u8 priv[SMC_WR_TX_PEND_PRIV_SIZE]; 32}; 33 34typedef void (*smc_wr_tx_handler)(struct smc_wr_tx_pend_priv *, 35 struct smc_link *, 36 enum ib_wc_status); 37 38typedef bool (*smc_wr_tx_filter)(struct smc_wr_tx_pend_priv *, 39 unsigned long); 40 41typedef void (*smc_wr_tx_dismisser)(struct smc_wr_tx_pend_priv *); 42 43struct 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 */ 52static 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 57static 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 62static 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 70static 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 76static inline void smc_wr_wakeup_tx_wait(struct smc_link *lnk) 77{ 78 wake_up_all(&lnk->wr_tx_wait); 79} 80 81static inline void smc_wr_wakeup_reg_wait(struct smc_link *lnk) 82{ 83 wake_up(&lnk->wr_reg_wait); 84} 85 86/* post a new receive work request to fill a completed old work request entry */ 87static inline int smc_wr_rx_post(struct smc_link *link) 88{ 89 int rc; 90 u64 wr_id, temp_wr_id; 91 u32 index; 92 93 wr_id = ++link->wr_rx_id; /* tasklet context, thus not atomic */ 94 temp_wr_id = wr_id; 95 index = do_div(temp_wr_id, link->wr_rx_cnt); 96 link->wr_rx_ibs[index].wr_id = wr_id; 97 rc = ib_post_recv(link->roce_qp, &link->wr_rx_ibs[index], NULL); 98 return rc; 99} 100 101int smc_wr_create_link(struct smc_link *lnk); 102int smc_wr_alloc_link_mem(struct smc_link *lnk); 103void smc_wr_free_link(struct smc_link *lnk); 104void smc_wr_free_link_mem(struct smc_link *lnk); 105void smc_wr_remember_qp_attr(struct smc_link *lnk); 106void smc_wr_remove_dev(struct smc_ib_device *smcibdev); 107void smc_wr_add_dev(struct smc_ib_device *smcibdev); 108 109int smc_wr_tx_get_free_slot(struct smc_link *link, smc_wr_tx_handler handler, 110 struct smc_wr_buf **wr_buf, 111 struct smc_rdma_wr **wrs, 112 struct smc_wr_tx_pend_priv **wr_pend_priv); 113int smc_wr_tx_put_slot(struct smc_link *link, 114 struct smc_wr_tx_pend_priv *wr_pend_priv); 115int smc_wr_tx_send(struct smc_link *link, 116 struct smc_wr_tx_pend_priv *wr_pend_priv); 117int smc_wr_tx_send_wait(struct smc_link *link, struct smc_wr_tx_pend_priv *priv, 118 unsigned long timeout); 119void smc_wr_tx_cq_handler(struct ib_cq *ib_cq, void *cq_context); 120void smc_wr_tx_dismiss_slots(struct smc_link *lnk, u8 wr_rx_hdr_type, 121 smc_wr_tx_filter filter, 122 smc_wr_tx_dismisser dismisser, 123 unsigned long data); 124void smc_wr_tx_wait_no_pending_sends(struct smc_link *link); 125 126int smc_wr_rx_register_handler(struct smc_wr_rx_handler *handler); 127int smc_wr_rx_post_init(struct smc_link *link); 128void smc_wr_rx_cq_handler(struct ib_cq *ib_cq, void *cq_context); 129int smc_wr_reg_send(struct smc_link *link, struct ib_mr *mr); 130 131#endif /* SMC_WR_H */ 132