cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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smc_wr.h (4006B)

      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);
    103int smc_wr_alloc_lgr_mem(struct smc_link_group *lgr);
    104void smc_wr_free_link(struct smc_link *lnk);
    105void smc_wr_free_link_mem(struct smc_link *lnk);
    106void smc_wr_free_lgr_mem(struct smc_link_group *lgr);
    107void smc_wr_remember_qp_attr(struct smc_link *lnk);
    108void smc_wr_remove_dev(struct smc_ib_device *smcibdev);
    109void smc_wr_add_dev(struct smc_ib_device *smcibdev);
    110
    111int smc_wr_tx_get_free_slot(struct smc_link *link, smc_wr_tx_handler handler,
    112			    struct smc_wr_buf **wr_buf,
    113			    struct smc_rdma_wr **wrs,
    114			    struct smc_wr_tx_pend_priv **wr_pend_priv);
    115int smc_wr_tx_get_v2_slot(struct smc_link *link,
    116			  smc_wr_tx_handler handler,
    117			  struct smc_wr_v2_buf **wr_buf,
    118			  struct smc_wr_tx_pend_priv **wr_pend_priv);
    119int smc_wr_tx_put_slot(struct smc_link *link,
    120		       struct smc_wr_tx_pend_priv *wr_pend_priv);
    121int smc_wr_tx_send(struct smc_link *link,
    122		   struct smc_wr_tx_pend_priv *wr_pend_priv);
    123int smc_wr_tx_v2_send(struct smc_link *link,
    124		      struct smc_wr_tx_pend_priv *priv, int len);
    125int smc_wr_tx_send_wait(struct smc_link *link, struct smc_wr_tx_pend_priv *priv,
    126			unsigned long timeout);
    127void smc_wr_tx_cq_handler(struct ib_cq *ib_cq, void *cq_context);
    128void smc_wr_tx_wait_no_pending_sends(struct smc_link *link);
    129
    130int smc_wr_rx_register_handler(struct smc_wr_rx_handler *handler);
    131int smc_wr_rx_post_init(struct smc_link *link);
    132void smc_wr_rx_cq_handler(struct ib_cq *ib_cq, void *cq_context);
    133int smc_wr_reg_send(struct smc_link *link, struct ib_mr *mr);
    134
    135#endif /* SMC_WR_H */