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Some CPU, such as Xeon, can guarantee DMA cache coherency. So it is no need to use dma sync APIs to flush cache on such CPUs. In order to avoid calling dma sync APIs on the IO path, use the dma_need_sync to check whether smc_buf_desc needs dma sync when creating smc_buf_desc. Signed-off-by: Guangguan Wang <guangguan.wang@linux.alibaba.com> Signed-off-by: David S. Miller <davem@davemloft.net>
121 lines
4.4 KiB
C
121 lines
4.4 KiB
C
/* 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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* Definitions for IB environment
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*
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* Copyright IBM Corp. 2016
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*
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* Author(s): Ursula Braun <Ursula Braun@linux.vnet.ibm.com>
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*/
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#ifndef _SMC_IB_H
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#define _SMC_IB_H
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#include <linux/interrupt.h>
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#include <linux/if_ether.h>
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#include <linux/mutex.h>
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#include <linux/wait.h>
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#include <rdma/ib_verbs.h>
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#include <net/smc.h>
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#define SMC_MAX_PORTS 2 /* Max # of ports */
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#define SMC_GID_SIZE sizeof(union ib_gid)
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#define SMC_IB_MAX_SEND_SGE 2
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struct smc_ib_devices { /* list of smc ib devices definition */
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struct list_head list;
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struct mutex mutex; /* protects list of smc ib devices */
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};
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extern struct smc_ib_devices smc_ib_devices; /* list of smc ib devices */
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extern struct smc_lgr_list smc_lgr_list; /* list of linkgroups */
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struct smc_ib_device { /* ib-device infos for smc */
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struct list_head list;
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struct ib_device *ibdev;
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struct ib_port_attr pattr[SMC_MAX_PORTS]; /* ib dev. port attrs */
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struct ib_event_handler event_handler; /* global ib_event handler */
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struct ib_cq *roce_cq_send; /* send completion queue */
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struct ib_cq *roce_cq_recv; /* recv completion queue */
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struct tasklet_struct send_tasklet; /* called by send cq handler */
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struct tasklet_struct recv_tasklet; /* called by recv cq handler */
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char mac[SMC_MAX_PORTS][ETH_ALEN];
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/* mac address per port*/
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u8 pnetid[SMC_MAX_PORTS][SMC_MAX_PNETID_LEN];
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/* pnetid per port */
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bool pnetid_by_user[SMC_MAX_PORTS];
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/* pnetid defined by user? */
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u8 initialized : 1; /* ib dev CQ, evthdl done */
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struct work_struct port_event_work;
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unsigned long port_event_mask;
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DECLARE_BITMAP(ports_going_away, SMC_MAX_PORTS);
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atomic_t lnk_cnt; /* number of links on ibdev */
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wait_queue_head_t lnks_deleted; /* wait 4 removal of all links*/
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struct mutex mutex; /* protect dev setup+cleanup */
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atomic_t lnk_cnt_by_port[SMC_MAX_PORTS];
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/* number of links per port */
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int ndev_ifidx[SMC_MAX_PORTS]; /* ndev if indexes */
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};
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static inline __be32 smc_ib_gid_to_ipv4(u8 gid[SMC_GID_SIZE])
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{
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struct in6_addr *addr6 = (struct in6_addr *)gid;
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if (ipv6_addr_v4mapped(addr6) ||
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!(addr6->s6_addr32[0] | addr6->s6_addr32[1] | addr6->s6_addr32[2]))
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return addr6->s6_addr32[3];
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return cpu_to_be32(INADDR_NONE);
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}
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static inline struct net *smc_ib_net(struct smc_ib_device *smcibdev)
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{
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if (smcibdev && smcibdev->ibdev)
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return read_pnet(&smcibdev->ibdev->coredev.rdma_net);
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return NULL;
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}
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struct smc_init_info_smcrv2;
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struct smc_buf_desc;
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struct smc_link;
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void smc_ib_ndev_change(struct net_device *ndev, unsigned long event);
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int smc_ib_register_client(void) __init;
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void smc_ib_unregister_client(void);
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bool smc_ib_port_active(struct smc_ib_device *smcibdev, u8 ibport);
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int smc_ib_buf_map_sg(struct smc_link *lnk,
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struct smc_buf_desc *buf_slot,
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enum dma_data_direction data_direction);
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void smc_ib_buf_unmap_sg(struct smc_link *lnk,
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struct smc_buf_desc *buf_slot,
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enum dma_data_direction data_direction);
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void smc_ib_dealloc_protection_domain(struct smc_link *lnk);
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int smc_ib_create_protection_domain(struct smc_link *lnk);
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void smc_ib_destroy_queue_pair(struct smc_link *lnk);
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int smc_ib_create_queue_pair(struct smc_link *lnk);
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int smc_ib_ready_link(struct smc_link *lnk);
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int smc_ib_modify_qp_rts(struct smc_link *lnk);
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int smc_ib_modify_qp_reset(struct smc_link *lnk);
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int smc_ib_modify_qp_error(struct smc_link *lnk);
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long smc_ib_setup_per_ibdev(struct smc_ib_device *smcibdev);
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int smc_ib_get_memory_region(struct ib_pd *pd, int access_flags,
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struct smc_buf_desc *buf_slot, u8 link_idx);
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void smc_ib_put_memory_region(struct ib_mr *mr);
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bool smc_ib_is_sg_need_sync(struct smc_link *lnk,
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struct smc_buf_desc *buf_slot);
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void smc_ib_sync_sg_for_cpu(struct smc_link *lnk,
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struct smc_buf_desc *buf_slot,
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enum dma_data_direction data_direction);
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void smc_ib_sync_sg_for_device(struct smc_link *lnk,
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struct smc_buf_desc *buf_slot,
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enum dma_data_direction data_direction);
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int smc_ib_determine_gid(struct smc_ib_device *smcibdev, u8 ibport,
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unsigned short vlan_id, u8 gid[], u8 *sgid_index,
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struct smc_init_info_smcrv2 *smcrv2);
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int smc_ib_find_route(__be32 saddr, __be32 daddr,
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u8 nexthop_mac[], u8 *uses_gateway);
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bool smc_ib_is_valid_local_systemid(void);
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int smcr_nl_get_device(struct sk_buff *skb, struct netlink_callback *cb);
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#endif
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