197 lines
6.4 KiB
C
197 lines
6.4 KiB
C
/*
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* Shared Memory Communications over RDMA (SMC-R) and RoCE
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*
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* Definitions for SMC Connections, Link Groups and Links
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*
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* Copyright IBM Corp. 2016
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*
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* Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com>
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*/
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#ifndef _SMC_CORE_H
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#define _SMC_CORE_H
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#include <linux/atomic.h>
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#include <rdma/ib_verbs.h>
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#include "smc.h"
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#include "smc_ib.h"
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#define SMC_RMBS_PER_LGR_MAX 255 /* max. # of RMBs per link group */
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struct smc_lgr_list { /* list of link group definition */
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struct list_head list;
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spinlock_t lock; /* protects list of link groups */
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};
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extern struct smc_lgr_list smc_lgr_list; /* list of link groups */
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enum smc_lgr_role { /* possible roles of a link group */
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SMC_CLNT, /* client */
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SMC_SERV /* server */
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};
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#define SMC_WR_BUF_SIZE 48 /* size of work request buffer */
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struct smc_wr_buf {
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u8 raw[SMC_WR_BUF_SIZE];
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};
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#define SMC_WR_REG_MR_WAIT_TIME (5 * HZ)/* wait time for ib_wr_reg_mr result */
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enum smc_wr_reg_state {
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POSTED, /* ib_wr_reg_mr request posted */
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CONFIRMED, /* ib_wr_reg_mr response: successful */
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FAILED /* ib_wr_reg_mr response: failure */
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};
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struct smc_link {
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struct smc_ib_device *smcibdev; /* ib-device */
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u8 ibport; /* port - values 1 | 2 */
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struct ib_pd *roce_pd; /* IB protection domain,
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* unique for every RoCE QP
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*/
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struct ib_qp *roce_qp; /* IB queue pair */
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struct ib_qp_attr qp_attr; /* IB queue pair attributes */
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struct smc_wr_buf *wr_tx_bufs; /* WR send payload buffers */
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struct ib_send_wr *wr_tx_ibs; /* WR send meta data */
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struct ib_sge *wr_tx_sges; /* WR send gather meta data */
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struct smc_wr_tx_pend *wr_tx_pends; /* WR send waiting for CQE */
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/* above four vectors have wr_tx_cnt elements and use the same index */
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dma_addr_t wr_tx_dma_addr; /* DMA address of wr_tx_bufs */
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atomic_long_t wr_tx_id; /* seq # of last sent WR */
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unsigned long *wr_tx_mask; /* bit mask of used indexes */
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u32 wr_tx_cnt; /* number of WR send buffers */
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wait_queue_head_t wr_tx_wait; /* wait for free WR send buf */
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struct smc_wr_buf *wr_rx_bufs; /* WR recv payload buffers */
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struct ib_recv_wr *wr_rx_ibs; /* WR recv meta data */
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struct ib_sge *wr_rx_sges; /* WR recv scatter meta data */
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/* above three vectors have wr_rx_cnt elements and use the same index */
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dma_addr_t wr_rx_dma_addr; /* DMA address of wr_rx_bufs */
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u64 wr_rx_id; /* seq # of last recv WR */
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u32 wr_rx_cnt; /* number of WR recv buffers */
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struct ib_reg_wr wr_reg; /* WR register memory region */
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wait_queue_head_t wr_reg_wait; /* wait for wr_reg result */
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enum smc_wr_reg_state wr_reg_state; /* state of wr_reg request */
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union ib_gid gid; /* gid matching used vlan id */
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u32 peer_qpn; /* QP number of peer */
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enum ib_mtu path_mtu; /* used mtu */
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enum ib_mtu peer_mtu; /* mtu size of peer */
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u32 psn_initial; /* QP tx initial packet seqno */
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u32 peer_psn; /* QP rx initial packet seqno */
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u8 peer_mac[ETH_ALEN]; /* = gid[8:10||13:15] */
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u8 peer_gid[sizeof(union ib_gid)]; /* gid of peer*/
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u8 link_id; /* unique # within link group */
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struct completion llc_confirm; /* wait for rx of conf link */
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struct completion llc_confirm_resp; /* wait 4 rx of cnf lnk rsp */
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};
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/* For now we just allow one parallel link per link group. The SMC protocol
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* allows more (up to 8).
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*/
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#define SMC_LINKS_PER_LGR_MAX 1
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#define SMC_SINGLE_LINK 0
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#define SMC_FIRST_CONTACT 1 /* first contact to a peer */
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#define SMC_REUSE_CONTACT 0 /* follow-on contact to a peer*/
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/* tx/rx buffer list element for sndbufs list and rmbs list of a lgr */
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struct smc_buf_desc {
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struct list_head list;
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void *cpu_addr; /* virtual address of buffer */
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struct sg_table sgt[SMC_LINKS_PER_LGR_MAX];/* virtual buffer */
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struct ib_mr *mr_rx[SMC_LINKS_PER_LGR_MAX];
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/* for rmb only: memory region
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* incl. rkey provided to peer
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*/
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u32 order; /* allocation order */
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u32 used; /* currently used / unused */
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bool reused; /* new created / reused */
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};
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struct smc_rtoken { /* address/key of remote RMB */
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u64 dma_addr;
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u32 rkey;
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};
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#define SMC_LGR_ID_SIZE 4
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struct smc_link_group {
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struct list_head list;
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enum smc_lgr_role role; /* client or server */
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__be32 daddr; /* destination ip address */
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struct smc_link lnk[SMC_LINKS_PER_LGR_MAX]; /* smc link */
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char peer_systemid[SMC_SYSTEMID_LEN];
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/* unique system_id of peer */
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struct rb_root conns_all; /* connection tree */
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rwlock_t conns_lock; /* protects conns_all */
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unsigned int conns_num; /* current # of connections */
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unsigned short vlan_id; /* vlan id of link group */
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struct list_head sndbufs[SMC_RMBE_SIZES];/* tx buffers */
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rwlock_t sndbufs_lock; /* protects tx buffers */
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struct list_head rmbs[SMC_RMBE_SIZES]; /* rx buffers */
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rwlock_t rmbs_lock; /* protects rx buffers */
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struct smc_rtoken rtokens[SMC_RMBS_PER_LGR_MAX]
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[SMC_LINKS_PER_LGR_MAX];
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/* remote addr/key pairs */
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unsigned long rtokens_used_mask[BITS_TO_LONGS(
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SMC_RMBS_PER_LGR_MAX)];
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/* used rtoken elements */
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u8 id[SMC_LGR_ID_SIZE]; /* unique lgr id */
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struct delayed_work free_work; /* delayed freeing of an lgr */
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bool sync_err; /* lgr no longer fits to peer */
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};
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/* Find the connection associated with the given alert token in the link group.
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* To use rbtrees we have to implement our own search core.
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* Requires @conns_lock
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* @token alert token to search for
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* @lgr link group to search in
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* Returns connection associated with token if found, NULL otherwise.
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*/
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static inline struct smc_connection *smc_lgr_find_conn(
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u32 token, struct smc_link_group *lgr)
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{
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struct smc_connection *res = NULL;
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struct rb_node *node;
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node = lgr->conns_all.rb_node;
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while (node) {
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struct smc_connection *cur = rb_entry(node,
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struct smc_connection, alert_node);
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if (cur->alert_token_local > token) {
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node = node->rb_left;
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} else {
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if (cur->alert_token_local < token) {
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node = node->rb_right;
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} else {
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res = cur;
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break;
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}
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}
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}
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return res;
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}
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struct smc_sock;
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struct smc_clc_msg_accept_confirm;
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void smc_lgr_free(struct smc_link_group *lgr);
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void smc_lgr_terminate(struct smc_link_group *lgr);
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int smc_buf_create(struct smc_sock *smc);
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int smc_rmb_rtoken_handling(struct smc_connection *conn,
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struct smc_clc_msg_accept_confirm *clc);
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void smc_sndbuf_sync_sg_for_cpu(struct smc_connection *conn);
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void smc_sndbuf_sync_sg_for_device(struct smc_connection *conn);
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void smc_rmb_sync_sg_for_cpu(struct smc_connection *conn);
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void smc_rmb_sync_sg_for_device(struct smc_connection *conn);
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#endif
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