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132 lines
3.8 KiB
132 lines
3.8 KiB
/* 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 <[email protected]> |
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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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static inline bool smc_wr_tx_link_hold(struct smc_link *link) |
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{ |
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if (!smc_link_usable(link)) |
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return false; |
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atomic_inc(&link->wr_tx_refcnt); |
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return true; |
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} |
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static inline void smc_wr_tx_link_put(struct smc_link *link) |
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{ |
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if (atomic_dec_and_test(&link->wr_tx_refcnt)) |
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wake_up_all(&link->wr_tx_wait); |
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} |
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static inline void smc_wr_wakeup_tx_wait(struct smc_link *lnk) |
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{ |
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wake_up_all(&lnk->wr_tx_wait); |
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} |
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static inline void smc_wr_wakeup_reg_wait(struct smc_link *lnk) |
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{ |
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wake_up(&lnk->wr_reg_wait); |
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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_rdma_wr **wrs, |
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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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int smc_wr_tx_send_wait(struct smc_link *link, struct smc_wr_tx_pend_priv *priv, |
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unsigned long timeout); |
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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_tx_wait_no_pending_sends(struct smc_link *link); |
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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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