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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#define SMC_WR_TX_WAIT_PENDING_TIME (5 * HZ)
26
27#define SMC_WR_TX_SIZE 44 /* actual size of wr_send data (<=SMC_WR_BUF_SIZE) */
28
29#define SMC_WR_TX_PEND_PRIV_SIZE 32
30
31struct smc_wr_tx_pend_priv {
32 u8 priv[SMC_WR_TX_PEND_PRIV_SIZE];
33};
34
35typedef void (*smc_wr_tx_handler)(struct smc_wr_tx_pend_priv *,
36 struct smc_link *,
37 enum ib_wc_status);
38
39typedef bool (*smc_wr_tx_filter)(struct smc_wr_tx_pend_priv *,
40 unsigned long);
41
42typedef void (*smc_wr_tx_dismisser)(struct smc_wr_tx_pend_priv *);
43
44struct smc_wr_rx_handler {
45 struct hlist_node list; /* hash table collision resolution */
46 void (*handler)(struct ib_wc *, void *);
47 u8 type;
48};
49
50/* Only used by RDMA write WRs.
51 * All other WRs (CDC/LLC) use smc_wr_tx_send handling WR_ID implicitly
52 */
53static inline long smc_wr_tx_get_next_wr_id(struct smc_link *link)
54{
55 return atomic_long_inc_return(&link->wr_tx_id);
56}
57
58static inline void smc_wr_tx_set_wr_id(atomic_long_t *wr_tx_id, long val)
59{
60 atomic_long_set(wr_tx_id, val);
61}
62
63static inline void smc_wr_wakeup_tx_wait(struct smc_link *lnk)
64{
65 wake_up_all(&lnk->wr_tx_wait);
66}
67
68static inline void smc_wr_wakeup_reg_wait(struct smc_link *lnk)
69{
70 wake_up(&lnk->wr_reg_wait);
71}
72
73/* post a new receive work request to fill a completed old work request entry */
74static inline int smc_wr_rx_post(struct smc_link *link)
75{
76 int rc;
77 u64 wr_id, temp_wr_id;
78 u32 index;
79
80 wr_id = ++link->wr_rx_id; /* tasklet context, thus not atomic */
81 temp_wr_id = wr_id;
82 index = do_div(temp_wr_id, link->wr_rx_cnt);
83 link->wr_rx_ibs[index].wr_id = wr_id;
84 rc = ib_post_recv(link->roce_qp, &link->wr_rx_ibs[index], NULL);
85 return rc;
86}
87
88int smc_wr_create_link(struct smc_link *lnk);
89int smc_wr_alloc_link_mem(struct smc_link *lnk);
90void smc_wr_free_link(struct smc_link *lnk);
91void smc_wr_free_link_mem(struct smc_link *lnk);
92void smc_wr_remember_qp_attr(struct smc_link *lnk);
93void smc_wr_remove_dev(struct smc_ib_device *smcibdev);
94void smc_wr_add_dev(struct smc_ib_device *smcibdev);
95
96int smc_wr_tx_get_free_slot(struct smc_link *link, smc_wr_tx_handler handler,
97 struct smc_wr_buf **wr_buf,
98 struct smc_rdma_wr **wrs,
99 struct smc_wr_tx_pend_priv **wr_pend_priv);
100int smc_wr_tx_put_slot(struct smc_link *link,
101 struct smc_wr_tx_pend_priv *wr_pend_priv);
102int smc_wr_tx_send(struct smc_link *link,
103 struct smc_wr_tx_pend_priv *wr_pend_priv);
104void smc_wr_tx_cq_handler(struct ib_cq *ib_cq, void *cq_context);
105void smc_wr_tx_dismiss_slots(struct smc_link *lnk, u8 wr_rx_hdr_type,
106 smc_wr_tx_filter filter,
107 smc_wr_tx_dismisser dismisser,
108 unsigned long data);
109
110int smc_wr_rx_register_handler(struct smc_wr_rx_handler *handler);
111int smc_wr_rx_post_init(struct smc_link *link);
112void smc_wr_rx_cq_handler(struct ib_cq *ib_cq, void *cq_context);
113int smc_wr_reg_send(struct smc_link *link, struct ib_mr *mr);
114
115#endif /* SMC_WR_H */