![Ursula Braun](/assets/img/avatar_default.png)
Proper socket refcounting makes the sock_put worker obsolete. Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
725 lines
19 KiB
C
725 lines
19 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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* 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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#include "smc_wr.h"
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#include "smc_llc.h"
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#include "smc_cdc.h"
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#include "smc_close.h"
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#define SMC_LGR_NUM_INCR 256
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#define SMC_LGR_FREE_DELAY_SERV (600 * HZ)
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#define SMC_LGR_FREE_DELAY_CLNT (SMC_LGR_FREE_DELAY_SERV + 10)
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static u32 smc_lgr_num; /* unique link group number */
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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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return;
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/* client link group creation always follows the server link group
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* creation. For client use a somewhat higher removal delay time,
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* otherwise there is a risk of out-of-sync link groups.
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*/
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mod_delayed_work(system_wq, &lgr->free_work,
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lgr->role == SMC_CLNT ? SMC_LGR_FREE_DELAY_CLNT :
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SMC_LGR_FREE_DELAY_SERV);
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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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if (list_empty(&lgr->list))
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goto free;
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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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free:
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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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int i;
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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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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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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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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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if (!smcibdev->initialized)
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smc_ib_setup_per_ibdev(smcibdev);
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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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rc = smc_wr_alloc_link_mem(lnk);
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if (rc)
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goto free_lgr;
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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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init_completion(&lnk->llc_confirm);
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init_completion(&lnk->llc_confirm_resp);
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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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return 0;
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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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free_lgr:
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kfree(lgr);
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out:
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return rc;
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}
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static void smc_buf_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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if (conn->rmb_desc) {
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conn->rmb_desc->reused = true;
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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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/* 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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if (!conn->lgr)
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return;
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smc_cdc_tx_dismiss_slots(conn);
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smc_lgr_unregister_conn(conn);
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smc_buf_unuse(conn);
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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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smc_ib_modify_qp_reset(lnk);
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smc_wr_free_link(lnk);
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smc_ib_destroy_queue_pair(lnk);
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smc_ib_dealloc_protection_domain(lnk);
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smc_wr_free_link_mem(lnk);
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}
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static void smc_buf_free(struct smc_buf_desc *buf_desc, struct smc_link *lnk,
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bool is_rmb)
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{
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if (is_rmb) {
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if (buf_desc->mr_rx[SMC_SINGLE_LINK])
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smc_ib_put_memory_region(
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buf_desc->mr_rx[SMC_SINGLE_LINK]);
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smc_ib_buf_unmap_sg(lnk->smcibdev, buf_desc,
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DMA_FROM_DEVICE);
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} else {
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smc_ib_buf_unmap_sg(lnk->smcibdev, buf_desc,
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DMA_TO_DEVICE);
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}
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sg_free_table(&buf_desc->sgt[SMC_SINGLE_LINK]);
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if (buf_desc->cpu_addr)
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free_pages((unsigned long)buf_desc->cpu_addr, buf_desc->order);
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kfree(buf_desc);
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}
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static void __smc_lgr_free_bufs(struct smc_link_group *lgr, bool is_rmb)
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{
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struct smc_link *lnk = &lgr->lnk[SMC_SINGLE_LINK];
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struct smc_buf_desc *buf_desc, *bf_desc;
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struct list_head *buf_list;
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int i;
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for (i = 0; i < SMC_RMBE_SIZES; i++) {
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if (is_rmb)
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buf_list = &lgr->rmbs[i];
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else
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buf_list = &lgr->sndbufs[i];
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list_for_each_entry_safe(buf_desc, bf_desc, buf_list,
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list) {
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list_del(&buf_desc->list);
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smc_buf_free(buf_desc, lnk, is_rmb);
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}
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}
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}
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static void smc_lgr_free_bufs(struct smc_link_group *lgr)
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{
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/* free send buffers */
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__smc_lgr_free_bufs(lgr, false);
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/* free rmbs */
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__smc_lgr_free_bufs(lgr, true);
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}
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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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smc_lgr_free_bufs(lgr);
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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 smc_sock *smc;
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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 = container_of(conn, struct smc_sock, conn);
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sock_hold(&smc->sk); /* sock_put in close work */
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conn->local_tx_ctrl.conn_state_flags.peer_conn_abort = 1;
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__smc_lgr_unregister_conn(conn);
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write_unlock_bh(&lgr->conns_lock);
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if (!schedule_work(&conn->close_work))
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sock_put(&smc->sk);
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write_lock_bh(&lgr->conns_lock);
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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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wake_up(&lgr->lnk[SMC_SINGLE_LINK].wr_reg_wait);
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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)
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{
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struct dst_entry *dst = sk_dst_get(clcsock->sk);
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int rc = 0;
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*vlan_id = 0;
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if (!dst) {
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rc = -ENOTCONN;
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goto out;
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}
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if (!dst->dev) {
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rc = -ENODEV;
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goto out_rel;
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}
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if (is_vlan_dev(dst->dev))
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*vlan_id = vlan_dev_vlan_id(dst->dev);
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out_rel:
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dst_release(dst);
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out:
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return rc;
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}
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/* determine the link gid matching the vlan id of the link group */
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static int smc_link_determine_gid(struct smc_link_group *lgr)
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{
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struct smc_link *lnk = &lgr->lnk[SMC_SINGLE_LINK];
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struct ib_gid_attr gattr;
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union ib_gid gid;
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int i;
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if (!lgr->vlan_id) {
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lnk->gid = lnk->smcibdev->gid[lnk->ibport - 1];
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return 0;
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}
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for (i = 0; i < lnk->smcibdev->pattr[lnk->ibport - 1].gid_tbl_len;
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i++) {
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if (ib_query_gid(lnk->smcibdev->ibdev, lnk->ibport, i, &gid,
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&gattr))
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continue;
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if (gattr.ndev) {
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if (is_vlan_dev(gattr.ndev) &&
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vlan_dev_vlan_id(gattr.ndev) == lgr->vlan_id) {
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lnk->gid = gid;
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dev_put(gattr.ndev);
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return 0;
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}
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dev_put(gattr.ndev);
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}
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}
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return -ENODEV;
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}
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/* create a new SMC connection (and a new link group if necessary) */
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int smc_conn_create(struct smc_sock *smc, __be32 peer_in_addr,
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struct smc_ib_device *smcibdev, u8 ibport,
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struct smc_clc_msg_local *lcl, int srv_first_contact)
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{
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struct smc_connection *conn = &smc->conn;
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struct smc_link_group *lgr;
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unsigned short vlan_id;
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enum smc_lgr_role role;
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int local_contact = SMC_FIRST_CONTACT;
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int rc = 0;
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role = smc->listen_smc ? SMC_SERV : SMC_CLNT;
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rc = smc_vlan_by_tcpsk(smc->clcsock, &vlan_id);
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if (rc)
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return rc;
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if ((role == SMC_CLNT) && srv_first_contact)
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/* create new link group as well */
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goto create;
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/* determine if an existing link group can be reused */
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spin_lock_bh(&smc_lgr_list.lock);
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list_for_each_entry(lgr, &smc_lgr_list.list, list) {
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write_lock_bh(&lgr->conns_lock);
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if (!memcmp(lgr->peer_systemid, lcl->id_for_peer,
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SMC_SYSTEMID_LEN) &&
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!memcmp(lgr->lnk[SMC_SINGLE_LINK].peer_gid, &lcl->gid,
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SMC_GID_SIZE) &&
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!memcmp(lgr->lnk[SMC_SINGLE_LINK].peer_mac, lcl->mac,
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sizeof(lcl->mac)) &&
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!lgr->sync_err &&
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(lgr->role == role) &&
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(lgr->vlan_id == vlan_id) &&
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((role == SMC_CLNT) ||
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(lgr->conns_num < SMC_RMBS_PER_LGR_MAX))) {
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/* link group found */
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local_contact = SMC_REUSE_CONTACT;
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conn->lgr = lgr;
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smc_lgr_register_conn(conn); /* add smc conn to lgr */
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write_unlock_bh(&lgr->conns_lock);
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break;
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}
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write_unlock_bh(&lgr->conns_lock);
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}
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spin_unlock_bh(&smc_lgr_list.lock);
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if (role == SMC_CLNT && !srv_first_contact &&
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(local_contact == SMC_FIRST_CONTACT)) {
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/* Server reuses a link group, but Client wants to start
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* a new one
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* send out_of_sync decline, reason synchr. error
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*/
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return -ENOLINK;
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}
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create:
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if (local_contact == SMC_FIRST_CONTACT) {
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rc = smc_lgr_create(smc, peer_in_addr, smcibdev, ibport,
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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);
|
|
}
|
|
conn->local_tx_ctrl.common.type = SMC_CDC_MSG_TYPE;
|
|
conn->local_tx_ctrl.len = sizeof(struct smc_cdc_msg);
|
|
#ifndef KERNEL_HAS_ATOMIC64
|
|
spin_lock_init(&conn->acurs_lock);
|
|
#endif
|
|
|
|
out:
|
|
return rc ? rc : local_contact;
|
|
}
|
|
|
|
/* try to reuse a sndbuf or rmb description slot for a certain
|
|
* buffer size; if not available, return NULL
|
|
*/
|
|
static inline
|
|
struct smc_buf_desc *smc_buf_get_slot(struct smc_link_group *lgr,
|
|
int compressed_bufsize,
|
|
rwlock_t *lock,
|
|
struct list_head *buf_list)
|
|
{
|
|
struct smc_buf_desc *buf_slot;
|
|
|
|
read_lock_bh(lock);
|
|
list_for_each_entry(buf_slot, buf_list, list) {
|
|
if (cmpxchg(&buf_slot->used, 0, 1) == 0) {
|
|
read_unlock_bh(lock);
|
|
return buf_slot;
|
|
}
|
|
}
|
|
read_unlock_bh(lock);
|
|
return NULL;
|
|
}
|
|
|
|
/* one of the conditions for announcing a receiver's current window size is
|
|
* that it "results in a minimum increase in the window size of 10% of the
|
|
* receive buffer space" [RFC7609]
|
|
*/
|
|
static inline int smc_rmb_wnd_update_limit(int rmbe_size)
|
|
{
|
|
return min_t(int, rmbe_size / 10, SOCK_MIN_SNDBUF / 2);
|
|
}
|
|
|
|
static struct smc_buf_desc *smc_new_buf_create(struct smc_link_group *lgr,
|
|
bool is_rmb, int bufsize)
|
|
{
|
|
struct smc_buf_desc *buf_desc;
|
|
struct smc_link *lnk;
|
|
int rc;
|
|
|
|
/* try to alloc a new buffer */
|
|
buf_desc = kzalloc(sizeof(*buf_desc), GFP_KERNEL);
|
|
if (!buf_desc)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
buf_desc->cpu_addr =
|
|
(void *)__get_free_pages(GFP_KERNEL | __GFP_NOWARN |
|
|
__GFP_NOMEMALLOC |
|
|
__GFP_NORETRY | __GFP_ZERO,
|
|
get_order(bufsize));
|
|
if (!buf_desc->cpu_addr) {
|
|
kfree(buf_desc);
|
|
return ERR_PTR(-EAGAIN);
|
|
}
|
|
buf_desc->order = get_order(bufsize);
|
|
|
|
/* build the sg table from the pages */
|
|
lnk = &lgr->lnk[SMC_SINGLE_LINK];
|
|
rc = sg_alloc_table(&buf_desc->sgt[SMC_SINGLE_LINK], 1,
|
|
GFP_KERNEL);
|
|
if (rc) {
|
|
smc_buf_free(buf_desc, lnk, is_rmb);
|
|
return ERR_PTR(rc);
|
|
}
|
|
sg_set_buf(buf_desc->sgt[SMC_SINGLE_LINK].sgl,
|
|
buf_desc->cpu_addr, bufsize);
|
|
|
|
/* map sg table to DMA address */
|
|
rc = smc_ib_buf_map_sg(lnk->smcibdev, buf_desc,
|
|
is_rmb ? DMA_FROM_DEVICE : DMA_TO_DEVICE);
|
|
/* SMC protocol depends on mapping to one DMA address only */
|
|
if (rc != 1) {
|
|
smc_buf_free(buf_desc, lnk, is_rmb);
|
|
return ERR_PTR(-EAGAIN);
|
|
}
|
|
|
|
/* create a new memory region for the RMB */
|
|
if (is_rmb) {
|
|
rc = smc_ib_get_memory_region(lnk->roce_pd,
|
|
IB_ACCESS_REMOTE_WRITE |
|
|
IB_ACCESS_LOCAL_WRITE,
|
|
buf_desc);
|
|
if (rc) {
|
|
smc_buf_free(buf_desc, lnk, is_rmb);
|
|
return ERR_PTR(rc);
|
|
}
|
|
}
|
|
|
|
return buf_desc;
|
|
}
|
|
|
|
static int __smc_buf_create(struct smc_sock *smc, bool is_rmb)
|
|
{
|
|
struct smc_connection *conn = &smc->conn;
|
|
struct smc_link_group *lgr = conn->lgr;
|
|
struct smc_buf_desc *buf_desc = ERR_PTR(-ENOMEM);
|
|
struct list_head *buf_list;
|
|
int bufsize, bufsize_short;
|
|
int sk_buf_size;
|
|
rwlock_t *lock;
|
|
|
|
if (is_rmb)
|
|
/* use socket recv buffer size (w/o overhead) as start value */
|
|
sk_buf_size = smc->sk.sk_rcvbuf / 2;
|
|
else
|
|
/* use socket send buffer size (w/o overhead) as start value */
|
|
sk_buf_size = smc->sk.sk_sndbuf / 2;
|
|
|
|
for (bufsize_short = smc_compress_bufsize(sk_buf_size);
|
|
bufsize_short >= 0; bufsize_short--) {
|
|
|
|
if (is_rmb) {
|
|
lock = &lgr->rmbs_lock;
|
|
buf_list = &lgr->rmbs[bufsize_short];
|
|
} else {
|
|
lock = &lgr->sndbufs_lock;
|
|
buf_list = &lgr->sndbufs[bufsize_short];
|
|
}
|
|
bufsize = smc_uncompress_bufsize(bufsize_short);
|
|
if ((1 << get_order(bufsize)) > SG_MAX_SINGLE_ALLOC)
|
|
continue;
|
|
|
|
/* check for reusable slot in the link group */
|
|
buf_desc = smc_buf_get_slot(lgr, bufsize_short, lock, buf_list);
|
|
if (buf_desc) {
|
|
memset(buf_desc->cpu_addr, 0, bufsize);
|
|
break; /* found reusable slot */
|
|
}
|
|
|
|
buf_desc = smc_new_buf_create(lgr, is_rmb, bufsize);
|
|
if (PTR_ERR(buf_desc) == -ENOMEM)
|
|
break;
|
|
if (IS_ERR(buf_desc))
|
|
continue;
|
|
|
|
buf_desc->used = 1;
|
|
write_lock_bh(lock);
|
|
list_add(&buf_desc->list, buf_list);
|
|
write_unlock_bh(lock);
|
|
break; /* found */
|
|
}
|
|
|
|
if (IS_ERR(buf_desc))
|
|
return -ENOMEM;
|
|
|
|
if (is_rmb) {
|
|
conn->rmb_desc = buf_desc;
|
|
conn->rmbe_size = bufsize;
|
|
conn->rmbe_size_short = bufsize_short;
|
|
smc->sk.sk_rcvbuf = bufsize * 2;
|
|
atomic_set(&conn->bytes_to_rcv, 0);
|
|
conn->rmbe_update_limit = smc_rmb_wnd_update_limit(bufsize);
|
|
} else {
|
|
conn->sndbuf_desc = buf_desc;
|
|
conn->sndbuf_size = bufsize;
|
|
smc->sk.sk_sndbuf = bufsize * 2;
|
|
atomic_set(&conn->sndbuf_space, bufsize);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void smc_sndbuf_sync_sg_for_cpu(struct smc_connection *conn)
|
|
{
|
|
struct smc_link_group *lgr = conn->lgr;
|
|
|
|
smc_ib_sync_sg_for_cpu(lgr->lnk[SMC_SINGLE_LINK].smcibdev,
|
|
conn->sndbuf_desc, DMA_TO_DEVICE);
|
|
}
|
|
|
|
void smc_sndbuf_sync_sg_for_device(struct smc_connection *conn)
|
|
{
|
|
struct smc_link_group *lgr = conn->lgr;
|
|
|
|
smc_ib_sync_sg_for_device(lgr->lnk[SMC_SINGLE_LINK].smcibdev,
|
|
conn->sndbuf_desc, DMA_TO_DEVICE);
|
|
}
|
|
|
|
void smc_rmb_sync_sg_for_cpu(struct smc_connection *conn)
|
|
{
|
|
struct smc_link_group *lgr = conn->lgr;
|
|
|
|
smc_ib_sync_sg_for_cpu(lgr->lnk[SMC_SINGLE_LINK].smcibdev,
|
|
conn->rmb_desc, DMA_FROM_DEVICE);
|
|
}
|
|
|
|
void smc_rmb_sync_sg_for_device(struct smc_connection *conn)
|
|
{
|
|
struct smc_link_group *lgr = conn->lgr;
|
|
|
|
smc_ib_sync_sg_for_device(lgr->lnk[SMC_SINGLE_LINK].smcibdev,
|
|
conn->rmb_desc, DMA_FROM_DEVICE);
|
|
}
|
|
|
|
/* create the send and receive buffer for an SMC socket;
|
|
* receive buffers are called RMBs;
|
|
* (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_buf_create(struct smc_sock *smc)
|
|
{
|
|
int rc;
|
|
|
|
/* create send buffer */
|
|
rc = __smc_buf_create(smc, false);
|
|
if (rc)
|
|
return rc;
|
|
/* create rmb */
|
|
rc = __smc_buf_create(smc, true);
|
|
if (rc)
|
|
smc_buf_free(smc->conn.sndbuf_desc,
|
|
&smc->conn.lgr->lnk[SMC_SINGLE_LINK], false);
|
|
return rc;
|
|
}
|
|
|
|
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) &&
|
|
(lgr->rtokens[i][SMC_SINGLE_LINK].dma_addr == dma_addr) &&
|
|
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;
|
|
}
|