/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Shared Memory Communications over RDMA (SMC-R) and RoCE
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*
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* Work Requests exploiting Infiniband API
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*
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* Copyright IBM Corp. 2016
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*
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* Author(s): Steffen Maier <maier@linux.vnet.ibm.com>
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*/
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#ifndef SMC_WR_H
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#define SMC_WR_H
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#include <linux/atomic.h>
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#include <rdma/ib_verbs.h>
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#include <asm/div64.h>
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#include "smc.h"
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#include "smc_core.h"
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#define SMC_WR_BUF_CNT 16 /* # of ctrl buffers per link */
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#define SMC_WR_TX_WAIT_FREE_SLOT_TIME (10 * HZ)
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#define SMC_WR_TX_WAIT_PENDING_TIME (5 * HZ)
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#define SMC_WR_TX_SIZE 44 /* actual size of wr_send data (<=SMC_WR_BUF_SIZE) */
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#define SMC_WR_TX_PEND_PRIV_SIZE 32
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struct smc_wr_tx_pend_priv {
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u8 priv[SMC_WR_TX_PEND_PRIV_SIZE];
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};
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typedef void (*smc_wr_tx_handler)(struct smc_wr_tx_pend_priv *,
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struct smc_link *,
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enum ib_wc_status);
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typedef bool (*smc_wr_tx_filter)(struct smc_wr_tx_pend_priv *,
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unsigned long);
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typedef void (*smc_wr_tx_dismisser)(struct smc_wr_tx_pend_priv *);
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struct smc_wr_rx_handler {
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struct hlist_node list; /* hash table collision resolution */
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void (*handler)(struct ib_wc *, void *);
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u8 type;
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};
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/* Only used by RDMA write WRs.
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* All other WRs (CDC/LLC) use smc_wr_tx_send handling WR_ID implicitly
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*/
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static inline long smc_wr_tx_get_next_wr_id(struct smc_link *link)
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{
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return atomic_long_inc_return(&link->wr_tx_id);
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}
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static inline void smc_wr_tx_set_wr_id(atomic_long_t *wr_tx_id, long val)
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{
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atomic_long_set(wr_tx_id, val);
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}
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/* post a new receive work request to fill a completed old work request entry */
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static inline int smc_wr_rx_post(struct smc_link *link)
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{
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int rc;
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u64 wr_id, temp_wr_id;
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u32 index;
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wr_id = ++link->wr_rx_id; /* tasklet context, thus not atomic */
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temp_wr_id = wr_id;
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index = do_div(temp_wr_id, link->wr_rx_cnt);
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link->wr_rx_ibs[index].wr_id = wr_id;
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rc = ib_post_recv(link->roce_qp, &link->wr_rx_ibs[index], NULL);
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return rc;
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}
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int smc_wr_create_link(struct smc_link *lnk);
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int smc_wr_alloc_link_mem(struct smc_link *lnk);
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void smc_wr_free_link(struct smc_link *lnk);
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void smc_wr_free_link_mem(struct smc_link *lnk);
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void smc_wr_remember_qp_attr(struct smc_link *lnk);
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void smc_wr_remove_dev(struct smc_ib_device *smcibdev);
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void smc_wr_add_dev(struct smc_ib_device *smcibdev);
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int smc_wr_tx_get_free_slot(struct smc_link *link, smc_wr_tx_handler handler,
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struct smc_wr_buf **wr_buf,
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struct smc_wr_tx_pend_priv **wr_pend_priv);
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int smc_wr_tx_put_slot(struct smc_link *link,
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struct smc_wr_tx_pend_priv *wr_pend_priv);
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int smc_wr_tx_send(struct smc_link *link,
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struct smc_wr_tx_pend_priv *wr_pend_priv);
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void smc_wr_tx_cq_handler(struct ib_cq *ib_cq, void *cq_context);
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void smc_wr_tx_dismiss_slots(struct smc_link *lnk, u8 wr_rx_hdr_type,
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smc_wr_tx_filter filter,
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smc_wr_tx_dismisser dismisser,
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unsigned long data);
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int smc_wr_rx_register_handler(struct smc_wr_rx_handler *handler);
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int smc_wr_rx_post_init(struct smc_link *link);
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void smc_wr_rx_cq_handler(struct ib_cq *ib_cq, void *cq_context);
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int smc_wr_reg_send(struct smc_link *link, struct ib_mr *mr);
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#endif /* SMC_WR_H */
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