2017-01-09 15:55:17 +00:00
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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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* Basic Transport Functions 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): Ursula Braun <ubraun@linux.vnet.ibm.com>
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*/
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#include <linux/socket.h>
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#include <linux/if_vlan.h>
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#include <linux/random.h>
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#include <linux/workqueue.h>
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#include <net/tcp.h>
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#include <net/sock.h>
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#include <rdma/ib_verbs.h>
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#include "smc.h"
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#include "smc_clc.h"
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#include "smc_core.h"
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#include "smc_ib.h"
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2017-01-09 15:55:19 +00:00
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#include "smc_wr.h"
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2017-01-09 15:55:21 +00:00
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#include "smc_llc.h"
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2017-01-09 15:55:17 +00:00
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2017-01-09 15:55:21 +00:00
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#define SMC_LGR_NUM_INCR 256
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2017-01-09 15:55:17 +00:00
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#define SMC_LGR_FREE_DELAY (600 * HZ)
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2017-01-09 15:55:21 +00:00
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static u32 smc_lgr_num; /* unique link group number */
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2017-01-09 15:55:17 +00:00
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/* Register connection's alert token in our lookup structure.
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* To use rbtrees we have to implement our own insert core.
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* Requires @conns_lock
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* @smc connection to register
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* Returns 0 on success, != otherwise.
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*/
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static void smc_lgr_add_alert_token(struct smc_connection *conn)
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{
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struct rb_node **link, *parent = NULL;
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u32 token = conn->alert_token_local;
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link = &conn->lgr->conns_all.rb_node;
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while (*link) {
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struct smc_connection *cur = rb_entry(*link,
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struct smc_connection, alert_node);
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parent = *link;
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if (cur->alert_token_local > token)
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link = &parent->rb_left;
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else
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link = &parent->rb_right;
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}
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/* Put the new node there */
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rb_link_node(&conn->alert_node, parent, link);
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rb_insert_color(&conn->alert_node, &conn->lgr->conns_all);
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}
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/* Register connection in link group by assigning an alert token
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* registered in a search tree.
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* Requires @conns_lock
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* Note that '0' is a reserved value and not assigned.
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*/
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static void smc_lgr_register_conn(struct smc_connection *conn)
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{
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struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
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static atomic_t nexttoken = ATOMIC_INIT(0);
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/* find a new alert_token_local value not yet used by some connection
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* in this link group
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*/
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sock_hold(&smc->sk); /* sock_put in smc_lgr_unregister_conn() */
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while (!conn->alert_token_local) {
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conn->alert_token_local = atomic_inc_return(&nexttoken);
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if (smc_lgr_find_conn(conn->alert_token_local, conn->lgr))
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conn->alert_token_local = 0;
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}
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smc_lgr_add_alert_token(conn);
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conn->lgr->conns_num++;
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}
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/* Unregister connection and reset the alert token of the given connection<
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*/
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static void __smc_lgr_unregister_conn(struct smc_connection *conn)
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{
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struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
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struct smc_link_group *lgr = conn->lgr;
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rb_erase(&conn->alert_node, &lgr->conns_all);
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lgr->conns_num--;
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conn->alert_token_local = 0;
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conn->lgr = NULL;
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sock_put(&smc->sk); /* sock_hold in smc_lgr_register_conn() */
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}
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/* Unregister connection and trigger lgr freeing if applicable
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*/
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static void smc_lgr_unregister_conn(struct smc_connection *conn)
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{
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struct smc_link_group *lgr = conn->lgr;
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int reduced = 0;
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write_lock_bh(&lgr->conns_lock);
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if (conn->alert_token_local) {
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reduced = 1;
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__smc_lgr_unregister_conn(conn);
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}
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write_unlock_bh(&lgr->conns_lock);
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if (reduced && !lgr->conns_num)
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schedule_delayed_work(&lgr->free_work, SMC_LGR_FREE_DELAY);
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}
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static void smc_lgr_free_work(struct work_struct *work)
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{
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struct smc_link_group *lgr = container_of(to_delayed_work(work),
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struct smc_link_group,
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free_work);
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bool conns;
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spin_lock_bh(&smc_lgr_list.lock);
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read_lock_bh(&lgr->conns_lock);
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conns = RB_EMPTY_ROOT(&lgr->conns_all);
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read_unlock_bh(&lgr->conns_lock);
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if (!conns) { /* number of lgr connections is no longer zero */
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spin_unlock_bh(&smc_lgr_list.lock);
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return;
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}
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list_del_init(&lgr->list); /* remove from smc_lgr_list */
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spin_unlock_bh(&smc_lgr_list.lock);
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smc_lgr_free(lgr);
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}
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/* create a new SMC link group */
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static int smc_lgr_create(struct smc_sock *smc, __be32 peer_in_addr,
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struct smc_ib_device *smcibdev, u8 ibport,
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char *peer_systemid, unsigned short vlan_id)
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{
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struct smc_link_group *lgr;
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struct smc_link *lnk;
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u8 rndvec[3];
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int rc = 0;
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2017-01-09 15:55:18 +00:00
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int i;
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2017-01-09 15:55:17 +00:00
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lgr = kzalloc(sizeof(*lgr), GFP_KERNEL);
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if (!lgr) {
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rc = -ENOMEM;
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goto out;
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}
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lgr->role = smc->listen_smc ? SMC_SERV : SMC_CLNT;
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lgr->sync_err = false;
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lgr->daddr = peer_in_addr;
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memcpy(lgr->peer_systemid, peer_systemid, SMC_SYSTEMID_LEN);
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lgr->vlan_id = vlan_id;
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2017-01-09 15:55:18 +00:00
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rwlock_init(&lgr->sndbufs_lock);
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rwlock_init(&lgr->rmbs_lock);
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for (i = 0; i < SMC_RMBE_SIZES; i++) {
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INIT_LIST_HEAD(&lgr->sndbufs[i]);
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INIT_LIST_HEAD(&lgr->rmbs[i]);
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}
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2017-01-09 15:55:21 +00:00
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smc_lgr_num += SMC_LGR_NUM_INCR;
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memcpy(&lgr->id, (u8 *)&smc_lgr_num, SMC_LGR_ID_SIZE);
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2017-01-09 15:55:17 +00:00
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INIT_DELAYED_WORK(&lgr->free_work, smc_lgr_free_work);
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lgr->conns_all = RB_ROOT;
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lnk = &lgr->lnk[SMC_SINGLE_LINK];
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/* initialize link */
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lnk->smcibdev = smcibdev;
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lnk->ibport = ibport;
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lnk->path_mtu = smcibdev->pattr[ibport - 1].active_mtu;
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2017-01-09 15:55:20 +00:00
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if (!smcibdev->initialized)
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smc_ib_setup_per_ibdev(smcibdev);
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2017-01-09 15:55:17 +00:00
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get_random_bytes(rndvec, sizeof(rndvec));
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lnk->psn_initial = rndvec[0] + (rndvec[1] << 8) + (rndvec[2] << 16);
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2017-01-09 15:55:19 +00:00
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rc = smc_wr_alloc_link_mem(lnk);
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if (rc)
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goto free_lgr;
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init_waitqueue_head(&lnk->wr_tx_wait);
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2017-01-09 15:55:20 +00:00
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rc = smc_ib_create_protection_domain(lnk);
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if (rc)
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goto free_link_mem;
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rc = smc_ib_create_queue_pair(lnk);
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if (rc)
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goto dealloc_pd;
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rc = smc_wr_create_link(lnk);
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if (rc)
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goto destroy_qp;
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2017-01-09 15:55:21 +00:00
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init_completion(&lnk->llc_confirm);
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init_completion(&lnk->llc_confirm_resp);
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2017-01-09 15:55:17 +00:00
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smc->conn.lgr = lgr;
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rwlock_init(&lgr->conns_lock);
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spin_lock_bh(&smc_lgr_list.lock);
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list_add(&lgr->list, &smc_lgr_list.list);
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spin_unlock_bh(&smc_lgr_list.lock);
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2017-01-09 15:55:19 +00:00
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return 0;
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2017-01-09 15:55:20 +00:00
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destroy_qp:
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smc_ib_destroy_queue_pair(lnk);
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dealloc_pd:
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smc_ib_dealloc_protection_domain(lnk);
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free_link_mem:
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smc_wr_free_link_mem(lnk);
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2017-01-09 15:55:19 +00:00
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free_lgr:
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kfree(lgr);
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2017-01-09 15:55:17 +00:00
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out:
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return rc;
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}
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2017-01-09 15:55:18 +00:00
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static void smc_sndbuf_unuse(struct smc_connection *conn)
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{
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if (conn->sndbuf_desc) {
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conn->sndbuf_desc->used = 0;
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conn->sndbuf_size = 0;
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}
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}
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static void smc_rmb_unuse(struct smc_connection *conn)
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{
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if (conn->rmb_desc) {
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conn->rmb_desc->used = 0;
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conn->rmbe_size = 0;
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}
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}
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2017-01-09 15:55:17 +00:00
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/* remove a finished connection from its link group */
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void smc_conn_free(struct smc_connection *conn)
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{
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struct smc_link_group *lgr = conn->lgr;
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if (!lgr)
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return;
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smc_lgr_unregister_conn(conn);
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2017-01-09 15:55:18 +00:00
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smc_rmb_unuse(conn);
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smc_sndbuf_unuse(conn);
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2017-01-09 15:55:17 +00:00
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}
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static void smc_link_clear(struct smc_link *lnk)
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{
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lnk->peer_qpn = 0;
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2017-01-09 15:55:20 +00:00
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smc_ib_modify_qp_reset(lnk);
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2017-01-09 15:55:19 +00:00
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smc_wr_free_link(lnk);
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2017-01-09 15:55:20 +00:00
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smc_ib_destroy_queue_pair(lnk);
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smc_ib_dealloc_protection_domain(lnk);
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2017-01-09 15:55:19 +00:00
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smc_wr_free_link_mem(lnk);
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2017-01-09 15:55:17 +00:00
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}
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2017-01-09 15:55:18 +00:00
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static void smc_lgr_free_sndbufs(struct smc_link_group *lgr)
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{
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struct smc_buf_desc *sndbuf_desc, *bf_desc;
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int i;
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for (i = 0; i < SMC_RMBE_SIZES; i++) {
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list_for_each_entry_safe(sndbuf_desc, bf_desc, &lgr->sndbufs[i],
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list) {
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2017-01-09 15:55:20 +00:00
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list_del(&sndbuf_desc->list);
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smc_ib_buf_unmap(lgr->lnk[SMC_SINGLE_LINK].smcibdev,
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smc_uncompress_bufsize(i),
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sndbuf_desc, DMA_TO_DEVICE);
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2017-01-09 15:55:18 +00:00
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kfree(sndbuf_desc->cpu_addr);
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kfree(sndbuf_desc);
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}
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}
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}
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static void smc_lgr_free_rmbs(struct smc_link_group *lgr)
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{
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struct smc_buf_desc *rmb_desc, *bf_desc;
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2017-01-09 15:55:20 +00:00
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struct smc_link *lnk = &lgr->lnk[SMC_SINGLE_LINK];
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2017-01-09 15:55:18 +00:00
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int i;
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for (i = 0; i < SMC_RMBE_SIZES; i++) {
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list_for_each_entry_safe(rmb_desc, bf_desc, &lgr->rmbs[i],
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list) {
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2017-01-09 15:55:20 +00:00
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list_del(&rmb_desc->list);
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smc_ib_buf_unmap(lnk->smcibdev,
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smc_uncompress_bufsize(i),
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rmb_desc, DMA_FROM_DEVICE);
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2017-01-09 15:55:18 +00:00
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kfree(rmb_desc->cpu_addr);
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kfree(rmb_desc);
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}
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}
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}
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2017-01-09 15:55:17 +00:00
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/* remove a link group */
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void smc_lgr_free(struct smc_link_group *lgr)
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{
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2017-01-09 15:55:18 +00:00
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smc_lgr_free_rmbs(lgr);
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smc_lgr_free_sndbufs(lgr);
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2017-01-09 15:55:17 +00:00
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smc_link_clear(&lgr->lnk[SMC_SINGLE_LINK]);
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kfree(lgr);
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}
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/* terminate linkgroup abnormally */
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void smc_lgr_terminate(struct smc_link_group *lgr)
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{
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struct smc_connection *conn;
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struct rb_node *node;
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spin_lock_bh(&smc_lgr_list.lock);
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if (list_empty(&lgr->list)) {
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/* termination already triggered */
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spin_unlock_bh(&smc_lgr_list.lock);
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return;
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}
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/* do not use this link group for new connections */
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list_del_init(&lgr->list);
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spin_unlock_bh(&smc_lgr_list.lock);
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write_lock_bh(&lgr->conns_lock);
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node = rb_first(&lgr->conns_all);
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while (node) {
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conn = rb_entry(node, struct smc_connection, alert_node);
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__smc_lgr_unregister_conn(conn);
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node = rb_first(&lgr->conns_all);
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}
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write_unlock_bh(&lgr->conns_lock);
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schedule_delayed_work(&lgr->free_work, SMC_LGR_FREE_DELAY);
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}
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/* Determine vlan of internal TCP socket.
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* @vlan_id: address to store the determined vlan id into
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*/
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|
|
static int smc_vlan_by_tcpsk(struct socket *clcsock, unsigned short *vlan_id)
|
|
|
|
{
|
|
|
|
struct dst_entry *dst = sk_dst_get(clcsock->sk);
|
|
|
|
int rc = 0;
|
|
|
|
|
|
|
|
*vlan_id = 0;
|
|
|
|
if (!dst) {
|
|
|
|
rc = -ENOTCONN;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
if (!dst->dev) {
|
|
|
|
rc = -ENODEV;
|
|
|
|
goto out_rel;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (is_vlan_dev(dst->dev))
|
|
|
|
*vlan_id = vlan_dev_vlan_id(dst->dev);
|
|
|
|
|
|
|
|
out_rel:
|
|
|
|
dst_release(dst);
|
|
|
|
out:
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* determine the link gid matching the vlan id of the link group */
|
|
|
|
static int smc_link_determine_gid(struct smc_link_group *lgr)
|
|
|
|
{
|
|
|
|
struct smc_link *lnk = &lgr->lnk[SMC_SINGLE_LINK];
|
|
|
|
struct ib_gid_attr gattr;
|
|
|
|
union ib_gid gid;
|
|
|
|
int i;
|
|
|
|
|
|
|
|
if (!lgr->vlan_id) {
|
|
|
|
lnk->gid = lnk->smcibdev->gid[lnk->ibport - 1];
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
for (i = 0; i < lnk->smcibdev->pattr[lnk->ibport - 1].gid_tbl_len;
|
|
|
|
i++) {
|
|
|
|
if (ib_query_gid(lnk->smcibdev->ibdev, lnk->ibport, i, &gid,
|
|
|
|
&gattr))
|
|
|
|
continue;
|
|
|
|
if (gattr.ndev &&
|
|
|
|
(vlan_dev_vlan_id(gattr.ndev) == lgr->vlan_id)) {
|
|
|
|
lnk->gid = gid;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return -ENODEV;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* create a new SMC connection (and a new link group if necessary) */
|
|
|
|
int smc_conn_create(struct smc_sock *smc, __be32 peer_in_addr,
|
|
|
|
struct smc_ib_device *smcibdev, u8 ibport,
|
|
|
|
struct smc_clc_msg_local *lcl, int srv_first_contact)
|
|
|
|
{
|
|
|
|
struct smc_connection *conn = &smc->conn;
|
|
|
|
struct smc_link_group *lgr;
|
|
|
|
unsigned short vlan_id;
|
|
|
|
enum smc_lgr_role role;
|
|
|
|
int local_contact = SMC_FIRST_CONTACT;
|
|
|
|
int rc = 0;
|
|
|
|
|
|
|
|
role = smc->listen_smc ? SMC_SERV : SMC_CLNT;
|
|
|
|
rc = smc_vlan_by_tcpsk(smc->clcsock, &vlan_id);
|
|
|
|
if (rc)
|
|
|
|
return rc;
|
|
|
|
|
|
|
|
if ((role == SMC_CLNT) && srv_first_contact)
|
|
|
|
/* create new link group as well */
|
|
|
|
goto create;
|
|
|
|
|
|
|
|
/* determine if an existing link group can be reused */
|
|
|
|
spin_lock_bh(&smc_lgr_list.lock);
|
|
|
|
list_for_each_entry(lgr, &smc_lgr_list.list, list) {
|
|
|
|
write_lock_bh(&lgr->conns_lock);
|
|
|
|
if (!memcmp(lgr->peer_systemid, lcl->id_for_peer,
|
|
|
|
SMC_SYSTEMID_LEN) &&
|
|
|
|
!memcmp(lgr->lnk[SMC_SINGLE_LINK].peer_gid, &lcl->gid,
|
|
|
|
SMC_GID_SIZE) &&
|
|
|
|
!memcmp(lgr->lnk[SMC_SINGLE_LINK].peer_mac, lcl->mac,
|
|
|
|
sizeof(lcl->mac)) &&
|
|
|
|
!lgr->sync_err &&
|
|
|
|
(lgr->role == role) &&
|
2017-01-09 15:55:18 +00:00
|
|
|
(lgr->vlan_id == vlan_id) &&
|
|
|
|
((role == SMC_CLNT) ||
|
|
|
|
(lgr->conns_num < SMC_RMBS_PER_LGR_MAX))) {
|
2017-01-09 15:55:17 +00:00
|
|
|
/* link group found */
|
|
|
|
local_contact = SMC_REUSE_CONTACT;
|
|
|
|
conn->lgr = lgr;
|
|
|
|
smc_lgr_register_conn(conn); /* add smc conn to lgr */
|
|
|
|
write_unlock_bh(&lgr->conns_lock);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
write_unlock_bh(&lgr->conns_lock);
|
|
|
|
}
|
|
|
|
spin_unlock_bh(&smc_lgr_list.lock);
|
|
|
|
|
|
|
|
if (role == SMC_CLNT && !srv_first_contact &&
|
|
|
|
(local_contact == SMC_FIRST_CONTACT)) {
|
|
|
|
/* Server reuses a link group, but Client wants to start
|
|
|
|
* a new one
|
|
|
|
* send out_of_sync decline, reason synchr. error
|
|
|
|
*/
|
|
|
|
return -ENOLINK;
|
|
|
|
}
|
|
|
|
|
|
|
|
create:
|
|
|
|
if (local_contact == SMC_FIRST_CONTACT) {
|
|
|
|
rc = smc_lgr_create(smc, peer_in_addr, smcibdev, ibport,
|
|
|
|
lcl->id_for_peer, vlan_id);
|
|
|
|
if (rc)
|
|
|
|
goto out;
|
|
|
|
smc_lgr_register_conn(conn); /* add smc conn to lgr */
|
|
|
|
rc = smc_link_determine_gid(conn->lgr);
|
|
|
|
}
|
|
|
|
|
|
|
|
out:
|
|
|
|
return rc ? rc : local_contact;
|
|
|
|
}
|
2017-01-09 15:55:18 +00:00
|
|
|
|
|
|
|
/* try to reuse a sndbuf description slot of the sndbufs list for a certain
|
|
|
|
* buf_size; if not available, return NULL
|
|
|
|
*/
|
|
|
|
static inline
|
|
|
|
struct smc_buf_desc *smc_sndbuf_get_slot(struct smc_link_group *lgr,
|
|
|
|
int compressed_bufsize)
|
|
|
|
{
|
|
|
|
struct smc_buf_desc *sndbuf_slot;
|
|
|
|
|
|
|
|
read_lock_bh(&lgr->sndbufs_lock);
|
|
|
|
list_for_each_entry(sndbuf_slot, &lgr->sndbufs[compressed_bufsize],
|
|
|
|
list) {
|
|
|
|
if (cmpxchg(&sndbuf_slot->used, 0, 1) == 0) {
|
|
|
|
read_unlock_bh(&lgr->sndbufs_lock);
|
|
|
|
return sndbuf_slot;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
read_unlock_bh(&lgr->sndbufs_lock);
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* try to reuse an rmb description slot of the rmbs list for a certain
|
|
|
|
* rmbe_size; if not available, return NULL
|
|
|
|
*/
|
|
|
|
static inline
|
|
|
|
struct smc_buf_desc *smc_rmb_get_slot(struct smc_link_group *lgr,
|
|
|
|
int compressed_bufsize)
|
|
|
|
{
|
|
|
|
struct smc_buf_desc *rmb_slot;
|
|
|
|
|
|
|
|
read_lock_bh(&lgr->rmbs_lock);
|
|
|
|
list_for_each_entry(rmb_slot, &lgr->rmbs[compressed_bufsize],
|
|
|
|
list) {
|
|
|
|
if (cmpxchg(&rmb_slot->used, 0, 1) == 0) {
|
|
|
|
read_unlock_bh(&lgr->rmbs_lock);
|
|
|
|
return rmb_slot;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
read_unlock_bh(&lgr->rmbs_lock);
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* create the tx buffer for an SMC socket */
|
|
|
|
int smc_sndbuf_create(struct smc_sock *smc)
|
|
|
|
{
|
|
|
|
struct smc_connection *conn = &smc->conn;
|
|
|
|
struct smc_link_group *lgr = conn->lgr;
|
|
|
|
int tmp_bufsize, tmp_bufsize_short;
|
|
|
|
struct smc_buf_desc *sndbuf_desc;
|
|
|
|
int rc;
|
|
|
|
|
|
|
|
/* use socket send buffer size (w/o overhead) as start value */
|
|
|
|
for (tmp_bufsize_short = smc_compress_bufsize(smc->sk.sk_sndbuf / 2);
|
|
|
|
tmp_bufsize_short >= 0; tmp_bufsize_short--) {
|
|
|
|
tmp_bufsize = smc_uncompress_bufsize(tmp_bufsize_short);
|
|
|
|
/* check for reusable sndbuf_slot in the link group */
|
|
|
|
sndbuf_desc = smc_sndbuf_get_slot(lgr, tmp_bufsize_short);
|
|
|
|
if (sndbuf_desc) {
|
|
|
|
memset(sndbuf_desc->cpu_addr, 0, tmp_bufsize);
|
|
|
|
break; /* found reusable slot */
|
|
|
|
}
|
|
|
|
/* try to alloc a new send buffer */
|
|
|
|
sndbuf_desc = kzalloc(sizeof(*sndbuf_desc), GFP_KERNEL);
|
|
|
|
if (!sndbuf_desc)
|
|
|
|
break; /* give up with -ENOMEM */
|
|
|
|
sndbuf_desc->cpu_addr = kzalloc(tmp_bufsize,
|
|
|
|
GFP_KERNEL | __GFP_NOWARN |
|
|
|
|
__GFP_NOMEMALLOC |
|
|
|
|
__GFP_NORETRY);
|
|
|
|
if (!sndbuf_desc->cpu_addr) {
|
|
|
|
kfree(sndbuf_desc);
|
|
|
|
/* if send buffer allocation has failed,
|
|
|
|
* try a smaller one
|
|
|
|
*/
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
rc = smc_ib_buf_map(lgr->lnk[SMC_SINGLE_LINK].smcibdev,
|
|
|
|
tmp_bufsize, sndbuf_desc,
|
|
|
|
DMA_TO_DEVICE);
|
|
|
|
if (rc) {
|
|
|
|
kfree(sndbuf_desc->cpu_addr);
|
|
|
|
kfree(sndbuf_desc);
|
|
|
|
continue; /* if mapping failed, try smaller one */
|
|
|
|
}
|
|
|
|
sndbuf_desc->used = 1;
|
|
|
|
write_lock_bh(&lgr->sndbufs_lock);
|
|
|
|
list_add(&sndbuf_desc->list,
|
|
|
|
&lgr->sndbufs[tmp_bufsize_short]);
|
|
|
|
write_unlock_bh(&lgr->sndbufs_lock);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
if (sndbuf_desc && sndbuf_desc->cpu_addr) {
|
|
|
|
conn->sndbuf_desc = sndbuf_desc;
|
|
|
|
conn->sndbuf_size = tmp_bufsize;
|
|
|
|
smc->sk.sk_sndbuf = tmp_bufsize * 2;
|
|
|
|
return 0;
|
|
|
|
} else {
|
|
|
|
return -ENOMEM;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* create the RMB for an SMC socket (even though the SMC protocol
|
|
|
|
* allows more than one RMB-element per RMB, the Linux implementation
|
|
|
|
* uses just one RMB-element per RMB, i.e. uses an extra RMB for every
|
|
|
|
* connection in a link group
|
|
|
|
*/
|
|
|
|
int smc_rmb_create(struct smc_sock *smc)
|
|
|
|
{
|
|
|
|
struct smc_connection *conn = &smc->conn;
|
|
|
|
struct smc_link_group *lgr = conn->lgr;
|
|
|
|
int tmp_bufsize, tmp_bufsize_short;
|
|
|
|
struct smc_buf_desc *rmb_desc;
|
|
|
|
int rc;
|
|
|
|
|
|
|
|
/* use socket recv buffer size (w/o overhead) as start value */
|
|
|
|
for (tmp_bufsize_short = smc_compress_bufsize(smc->sk.sk_rcvbuf / 2);
|
|
|
|
tmp_bufsize_short >= 0; tmp_bufsize_short--) {
|
|
|
|
tmp_bufsize = smc_uncompress_bufsize(tmp_bufsize_short);
|
|
|
|
/* check for reusable rmb_slot in the link group */
|
|
|
|
rmb_desc = smc_rmb_get_slot(lgr, tmp_bufsize_short);
|
|
|
|
if (rmb_desc) {
|
|
|
|
memset(rmb_desc->cpu_addr, 0, tmp_bufsize);
|
|
|
|
break; /* found reusable slot */
|
|
|
|
}
|
|
|
|
/* try to alloc a new RMB */
|
|
|
|
rmb_desc = kzalloc(sizeof(*rmb_desc), GFP_KERNEL);
|
|
|
|
if (!rmb_desc)
|
|
|
|
break; /* give up with -ENOMEM */
|
|
|
|
rmb_desc->cpu_addr = kzalloc(tmp_bufsize,
|
|
|
|
GFP_KERNEL | __GFP_NOWARN |
|
|
|
|
__GFP_NOMEMALLOC |
|
|
|
|
__GFP_NORETRY);
|
|
|
|
if (!rmb_desc->cpu_addr) {
|
|
|
|
kfree(rmb_desc);
|
|
|
|
/* if RMB allocation has failed,
|
|
|
|
* try a smaller one
|
|
|
|
*/
|
|
|
|
continue;
|
|
|
|
}
|
|
|
|
rc = smc_ib_buf_map(lgr->lnk[SMC_SINGLE_LINK].smcibdev,
|
|
|
|
tmp_bufsize, rmb_desc,
|
|
|
|
DMA_FROM_DEVICE);
|
|
|
|
if (rc) {
|
|
|
|
kfree(rmb_desc->cpu_addr);
|
|
|
|
kfree(rmb_desc);
|
|
|
|
continue; /* if mapping failed, try smaller one */
|
|
|
|
}
|
2017-01-09 15:55:20 +00:00
|
|
|
rc = smc_ib_get_memory_region(lgr->lnk[SMC_SINGLE_LINK].roce_pd,
|
|
|
|
IB_ACCESS_REMOTE_WRITE |
|
|
|
|
IB_ACCESS_LOCAL_WRITE,
|
|
|
|
&rmb_desc->mr_rx[SMC_SINGLE_LINK]);
|
|
|
|
if (rc) {
|
|
|
|
smc_ib_buf_unmap(lgr->lnk[SMC_SINGLE_LINK].smcibdev,
|
|
|
|
tmp_bufsize, rmb_desc,
|
|
|
|
DMA_FROM_DEVICE);
|
|
|
|
kfree(rmb_desc->cpu_addr);
|
|
|
|
kfree(rmb_desc);
|
|
|
|
continue;
|
|
|
|
}
|
2017-01-09 15:55:18 +00:00
|
|
|
rmb_desc->used = 1;
|
|
|
|
write_lock_bh(&lgr->rmbs_lock);
|
|
|
|
list_add(&rmb_desc->list,
|
|
|
|
&lgr->rmbs[tmp_bufsize_short]);
|
|
|
|
write_unlock_bh(&lgr->rmbs_lock);
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
if (rmb_desc && rmb_desc->cpu_addr) {
|
|
|
|
conn->rmb_desc = rmb_desc;
|
|
|
|
conn->rmbe_size = tmp_bufsize;
|
|
|
|
conn->rmbe_size_short = tmp_bufsize_short;
|
|
|
|
smc->sk.sk_rcvbuf = tmp_bufsize * 2;
|
|
|
|
return 0;
|
|
|
|
} else {
|
|
|
|
return -ENOMEM;
|
|
|
|
}
|
|
|
|
}
|
2017-01-09 15:55:20 +00:00
|
|
|
|
|
|
|
static inline int smc_rmb_reserve_rtoken_idx(struct smc_link_group *lgr)
|
|
|
|
{
|
|
|
|
int i;
|
|
|
|
|
|
|
|
for_each_clear_bit(i, lgr->rtokens_used_mask, SMC_RMBS_PER_LGR_MAX) {
|
|
|
|
if (!test_and_set_bit(i, lgr->rtokens_used_mask))
|
|
|
|
return i;
|
|
|
|
}
|
|
|
|
return -ENOSPC;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* save rkey and dma_addr received from peer during clc handshake */
|
|
|
|
int smc_rmb_rtoken_handling(struct smc_connection *conn,
|
|
|
|
struct smc_clc_msg_accept_confirm *clc)
|
|
|
|
{
|
|
|
|
u64 dma_addr = be64_to_cpu(clc->rmb_dma_addr);
|
|
|
|
struct smc_link_group *lgr = conn->lgr;
|
|
|
|
u32 rkey = ntohl(clc->rmb_rkey);
|
|
|
|
int i;
|
|
|
|
|
|
|
|
for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) {
|
|
|
|
if ((lgr->rtokens[i][SMC_SINGLE_LINK].rkey == rkey) &&
|
|
|
|
test_bit(i, lgr->rtokens_used_mask)) {
|
|
|
|
conn->rtoken_idx = i;
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
conn->rtoken_idx = smc_rmb_reserve_rtoken_idx(lgr);
|
|
|
|
if (conn->rtoken_idx < 0)
|
|
|
|
return conn->rtoken_idx;
|
|
|
|
lgr->rtokens[conn->rtoken_idx][SMC_SINGLE_LINK].rkey = rkey;
|
|
|
|
lgr->rtokens[conn->rtoken_idx][SMC_SINGLE_LINK].dma_addr = dma_addr;
|
|
|
|
return 0;
|
|
|
|
}
|