12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879808182838485868788899091929394959697989910010110210310410510610710810911011111211311411511611711811912012112212312412512612712812913013113213313413513613713813914014114214314414514614714814915015115215315415515615715815916016116216316416516616716816917017117217317417517617717817918018118218318418518618718818919019119219319419519619719819920020120220320420520620720820921021121221321421521621721821922022122222322422522622722822923023123223323423523623723823924024124224324424524624724824925025125225325425525625725825926026126226326426526626726826927027127227327427527627727827928028128228328428528628728828929029129229329429529629729829930030130230330430530630730830931031131231331431531631731831932032132232332432532632732832933033133233333433533633733833934034134234334434534634734834935035135235335435535635735835936036136236336436536636736836937037137237337437537637737837938038138238338438538638738838939039139239339439539639739839940040140240340440540640740840941041141241341441541641741841942042142242342442542642742842943043143243343443543643743843944044144244344444544644744844945045145245345445545645745845946046146246346446546646746846947047147247347447547647747847948048148248348448548648748848949049149249349449549649749849950050150250350450550650750850951051151251351451551651751851952052152252352452552652752852953053153253353453553653753853954054154254354454554654754854955055155255355455555655755855956056156256356456556656756856957057157257357457557657757857958058158258358458558658758858959059159259359459559659759859960060160260360460560660760860961061161261361461561661761861962062162262362462562662762862963063163263363463563663763863964064164264364464564664764864965065165265365465565665765865966066166266366466566666766866967067167267367467567667767867968068168268368468568668768868969069169269369469569669769869970070170270370470570670770870971071171271371471571671771871972072172272372472572672772872973073173273373473573673773873974074174274374474574674774874975075175275375475575675775875976076176276376476576676776876977077177277377477577677777877978078178278378478578678778878979079179279379479579679779879980080180280380480580680780880981081181281381481581681781881982082182282382482582682782882983083183283383483583683783883984084184284384484584684784884985085185285385485585685785885986086186286386486586686786886987087187287387487587687787887988088188288388488588688788888989089189289389489589689789889990090190290390490590690790890991091191291391491591691791891992092192292392492592692792892993093193293393493593693793893994094194294394494594694794894995095195295395495595695795895996096196296396496596696796896997097197297397497597697797897998098198298398498598698798898999099199299399499599699799899910001001100210031004100510061007100810091010101110121013101410151016101710181019102010211022102310241025102610271028102910301031103210331034103510361037103810391040104110421043104410451046104710481049105010511052105310541055105610571058105910601061106210631064106510661067106810691070107110721073107410751076107710781079108010811082108310841085108610871088108910901091109210931094109510961097109810991100110111021103110411051106110711081109111011111112111311141115111611171118111911201121112211231124112511261127112811291130113111321133113411351136113711381139114011411142114311441145114611471148114911501151115211531154115511561157115811591160116111621163116411651166116711681169117011711172117311741175117611771178117911801181118211831184118511861187118811891190119111921193119411951196119711981199120012011202120312041205120612071208120912101211121212131214121512161217121812191220122112221223122412251226122712281229123012311232123312341235123612371238123912401241124212431244124512461247124812491250125112521253125412551256125712581259126012611262126312641265126612671268126912701271127212731274127512761277127812791280128112821283128412851286128712881289129012911292129312941295129612971298129913001301130213031304130513061307130813091310131113121313131413151316131713181319132013211322132313241325132613271328132913301331133213331334133513361337133813391340134113421343134413451346134713481349135013511352135313541355135613571358135913601361136213631364136513661367136813691370137113721373137413751376137713781379138013811382138313841385138613871388138913901391139213931394139513961397139813991400140114021403140414051406140714081409141014111412141314141415141614171418141914201421142214231424142514261427142814291430143114321433143414351436143714381439144014411442144314441445144614471448144914501451145214531454145514561457145814591460146114621463146414651466146714681469147014711472147314741475147614771478147914801481148214831484148514861487148814891490149114921493149414951496149714981499150015011502150315041505150615071508150915101511151215131514151515161517151815191520152115221523152415251526152715281529153015311532153315341535153615371538153915401541154215431544154515461547154815491550155115521553155415551556155715581559156015611562156315641565156615671568156915701571157215731574157515761577157815791580158115821583158415851586158715881589159015911592159315941595159615971598159916001601160216031604160516061607160816091610161116121613161416151616161716181619162016211622162316241625162616271628162916301631163216331634163516361637163816391640164116421643164416451646164716481649165016511652165316541655165616571658165916601661166216631664166516661667166816691670167116721673167416751676167716781679168016811682168316841685168616871688168916901691169216931694169516961697169816991700170117021703170417051706170717081709171017111712171317141715171617171718171917201721172217231724172517261727172817291730173117321733173417351736173717381739174017411742174317441745174617471748174917501751175217531754175517561757175817591760176117621763176417651766176717681769177017711772177317741775177617771778177917801781178217831784178517861787178817891790179117921793179417951796179717981799180018011802180318041805180618071808180918101811181218131814181518161817181818191820182118221823182418251826182718281829183018311832183318341835183618371838183918401841184218431844184518461847184818491850185118521853185418551856185718581859186018611862186318641865186618671868186918701871187218731874187518761877187818791880188118821883188418851886188718881889189018911892189318941895189618971898189919001901190219031904190519061907190819091910191119121913191419151916191719181919192019211922192319241925192619271928192919301931193219331934193519361937193819391940194119421943194419451946194719481949195019511952195319541955195619571958195919601961196219631964196519661967196819691970 |
- // SPDX-License-Identifier: GPL-2.0
- /*
- * Shared Memory Communications over RDMA (SMC-R) and RoCE
- *
- * Basic Transport Functions exploiting Infiniband API
- *
- * Copyright IBM Corp. 2016
- *
- * Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com>
- */
- #include <linux/socket.h>
- #include <linux/if_vlan.h>
- #include <linux/random.h>
- #include <linux/workqueue.h>
- #include <linux/wait.h>
- #include <linux/reboot.h>
- #include <linux/mutex.h>
- #include <net/tcp.h>
- #include <net/sock.h>
- #include <rdma/ib_verbs.h>
- #include <rdma/ib_cache.h>
- #include "smc.h"
- #include "smc_clc.h"
- #include "smc_core.h"
- #include "smc_ib.h"
- #include "smc_wr.h"
- #include "smc_llc.h"
- #include "smc_cdc.h"
- #include "smc_close.h"
- #include "smc_ism.h"
- #define SMC_LGR_NUM_INCR 256
- #define SMC_LGR_FREE_DELAY_SERV (600 * HZ)
- #define SMC_LGR_FREE_DELAY_CLNT (SMC_LGR_FREE_DELAY_SERV + 10 * HZ)
- static struct smc_lgr_list smc_lgr_list = { /* established link groups */
- .lock = __SPIN_LOCK_UNLOCKED(smc_lgr_list.lock),
- .list = LIST_HEAD_INIT(smc_lgr_list.list),
- .num = 0,
- };
- static atomic_t lgr_cnt = ATOMIC_INIT(0); /* number of existing link groups */
- static DECLARE_WAIT_QUEUE_HEAD(lgrs_deleted);
- static void smc_buf_free(struct smc_link_group *lgr, bool is_rmb,
- struct smc_buf_desc *buf_desc);
- static void __smc_lgr_terminate(struct smc_link_group *lgr, bool soft);
- static void smc_link_down_work(struct work_struct *work);
- /* return head of link group list and its lock for a given link group */
- static inline struct list_head *smc_lgr_list_head(struct smc_link_group *lgr,
- spinlock_t **lgr_lock)
- {
- if (lgr->is_smcd) {
- *lgr_lock = &lgr->smcd->lgr_lock;
- return &lgr->smcd->lgr_list;
- }
- *lgr_lock = &smc_lgr_list.lock;
- return &smc_lgr_list.list;
- }
- static void smc_lgr_schedule_free_work(struct smc_link_group *lgr)
- {
- /* client link group creation always follows the server link group
- * creation. For client use a somewhat higher removal delay time,
- * otherwise there is a risk of out-of-sync link groups.
- */
- if (!lgr->freeing) {
- mod_delayed_work(system_wq, &lgr->free_work,
- (!lgr->is_smcd && lgr->role == SMC_CLNT) ?
- SMC_LGR_FREE_DELAY_CLNT :
- SMC_LGR_FREE_DELAY_SERV);
- }
- }
- /* Register connection's alert token in our lookup structure.
- * To use rbtrees we have to implement our own insert core.
- * Requires @conns_lock
- * @smc connection to register
- * Returns 0 on success, != otherwise.
- */
- static void smc_lgr_add_alert_token(struct smc_connection *conn)
- {
- struct rb_node **link, *parent = NULL;
- u32 token = conn->alert_token_local;
- link = &conn->lgr->conns_all.rb_node;
- while (*link) {
- struct smc_connection *cur = rb_entry(*link,
- struct smc_connection, alert_node);
- parent = *link;
- if (cur->alert_token_local > token)
- link = &parent->rb_left;
- else
- link = &parent->rb_right;
- }
- /* Put the new node there */
- rb_link_node(&conn->alert_node, parent, link);
- rb_insert_color(&conn->alert_node, &conn->lgr->conns_all);
- }
- /* assign an SMC-R link to the connection */
- static int smcr_lgr_conn_assign_link(struct smc_connection *conn, bool first)
- {
- enum smc_link_state expected = first ? SMC_LNK_ACTIVATING :
- SMC_LNK_ACTIVE;
- int i, j;
- /* do link balancing */
- for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
- struct smc_link *lnk = &conn->lgr->lnk[i];
- if (lnk->state != expected || lnk->link_is_asym)
- continue;
- if (conn->lgr->role == SMC_CLNT) {
- conn->lnk = lnk; /* temporary, SMC server assigns link*/
- break;
- }
- if (conn->lgr->conns_num % 2) {
- for (j = i + 1; j < SMC_LINKS_PER_LGR_MAX; j++) {
- struct smc_link *lnk2;
- lnk2 = &conn->lgr->lnk[j];
- if (lnk2->state == expected &&
- !lnk2->link_is_asym) {
- conn->lnk = lnk2;
- break;
- }
- }
- }
- if (!conn->lnk)
- conn->lnk = lnk;
- break;
- }
- if (!conn->lnk)
- return SMC_CLC_DECL_NOACTLINK;
- return 0;
- }
- /* Register connection in link group by assigning an alert token
- * registered in a search tree.
- * Requires @conns_lock
- * Note that '0' is a reserved value and not assigned.
- */
- static int smc_lgr_register_conn(struct smc_connection *conn, bool first)
- {
- struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
- static atomic_t nexttoken = ATOMIC_INIT(0);
- int rc;
- if (!conn->lgr->is_smcd) {
- rc = smcr_lgr_conn_assign_link(conn, first);
- if (rc)
- return rc;
- }
- /* find a new alert_token_local value not yet used by some connection
- * in this link group
- */
- sock_hold(&smc->sk); /* sock_put in smc_lgr_unregister_conn() */
- while (!conn->alert_token_local) {
- conn->alert_token_local = atomic_inc_return(&nexttoken);
- if (smc_lgr_find_conn(conn->alert_token_local, conn->lgr))
- conn->alert_token_local = 0;
- }
- smc_lgr_add_alert_token(conn);
- conn->lgr->conns_num++;
- return 0;
- }
- /* Unregister connection and reset the alert token of the given connection<
- */
- static void __smc_lgr_unregister_conn(struct smc_connection *conn)
- {
- struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
- struct smc_link_group *lgr = conn->lgr;
- rb_erase(&conn->alert_node, &lgr->conns_all);
- lgr->conns_num--;
- conn->alert_token_local = 0;
- sock_put(&smc->sk); /* sock_hold in smc_lgr_register_conn() */
- }
- /* Unregister connection from lgr
- */
- static void smc_lgr_unregister_conn(struct smc_connection *conn)
- {
- struct smc_link_group *lgr = conn->lgr;
- if (!lgr)
- return;
- write_lock_bh(&lgr->conns_lock);
- if (conn->alert_token_local) {
- __smc_lgr_unregister_conn(conn);
- }
- write_unlock_bh(&lgr->conns_lock);
- conn->lgr = NULL;
- }
- void smc_lgr_cleanup_early(struct smc_connection *conn)
- {
- struct smc_link_group *lgr = conn->lgr;
- spinlock_t *lgr_lock;
- if (!lgr)
- return;
- smc_conn_free(conn);
- smc_lgr_list_head(lgr, &lgr_lock);
- spin_lock_bh(lgr_lock);
- /* do not use this link group for new connections */
- if (!list_empty(&lgr->list))
- list_del_init(&lgr->list);
- spin_unlock_bh(lgr_lock);
- __smc_lgr_terminate(lgr, true);
- }
- static void smcr_lgr_link_deactivate_all(struct smc_link_group *lgr)
- {
- int i;
- for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
- struct smc_link *lnk = &lgr->lnk[i];
- if (smc_link_sendable(lnk))
- lnk->state = SMC_LNK_INACTIVE;
- }
- wake_up_all(&lgr->llc_msg_waiter);
- wake_up_all(&lgr->llc_flow_waiter);
- }
- static void smc_lgr_free(struct smc_link_group *lgr);
- static void smc_lgr_free_work(struct work_struct *work)
- {
- struct smc_link_group *lgr = container_of(to_delayed_work(work),
- struct smc_link_group,
- free_work);
- spinlock_t *lgr_lock;
- bool conns;
- smc_lgr_list_head(lgr, &lgr_lock);
- spin_lock_bh(lgr_lock);
- if (lgr->freeing) {
- spin_unlock_bh(lgr_lock);
- return;
- }
- read_lock_bh(&lgr->conns_lock);
- conns = RB_EMPTY_ROOT(&lgr->conns_all);
- read_unlock_bh(&lgr->conns_lock);
- if (!conns) { /* number of lgr connections is no longer zero */
- spin_unlock_bh(lgr_lock);
- return;
- }
- list_del_init(&lgr->list); /* remove from smc_lgr_list */
- lgr->freeing = 1; /* this instance does the freeing, no new schedule */
- spin_unlock_bh(lgr_lock);
- cancel_delayed_work(&lgr->free_work);
- if (!lgr->is_smcd && !lgr->terminating)
- smc_llc_send_link_delete_all(lgr, true,
- SMC_LLC_DEL_PROG_INIT_TERM);
- if (lgr->is_smcd && !lgr->terminating)
- smc_ism_signal_shutdown(lgr);
- if (!lgr->is_smcd)
- smcr_lgr_link_deactivate_all(lgr);
- smc_lgr_free(lgr);
- }
- static void smc_lgr_terminate_work(struct work_struct *work)
- {
- struct smc_link_group *lgr = container_of(work, struct smc_link_group,
- terminate_work);
- __smc_lgr_terminate(lgr, true);
- }
- /* return next unique link id for the lgr */
- static u8 smcr_next_link_id(struct smc_link_group *lgr)
- {
- u8 link_id;
- int i;
- while (1) {
- again:
- link_id = ++lgr->next_link_id;
- if (!link_id) /* skip zero as link_id */
- link_id = ++lgr->next_link_id;
- for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
- if (smc_link_usable(&lgr->lnk[i]) &&
- lgr->lnk[i].link_id == link_id)
- goto again;
- }
- break;
- }
- return link_id;
- }
- int smcr_link_init(struct smc_link_group *lgr, struct smc_link *lnk,
- u8 link_idx, struct smc_init_info *ini)
- {
- u8 rndvec[3];
- int rc;
- get_device(&ini->ib_dev->ibdev->dev);
- atomic_inc(&ini->ib_dev->lnk_cnt);
- lnk->link_id = smcr_next_link_id(lgr);
- lnk->lgr = lgr;
- lnk->link_idx = link_idx;
- lnk->smcibdev = ini->ib_dev;
- lnk->ibport = ini->ib_port;
- lnk->path_mtu = ini->ib_dev->pattr[ini->ib_port - 1].active_mtu;
- smc_llc_link_set_uid(lnk);
- INIT_WORK(&lnk->link_down_wrk, smc_link_down_work);
- if (!ini->ib_dev->initialized) {
- rc = (int)smc_ib_setup_per_ibdev(ini->ib_dev);
- if (rc)
- goto out;
- }
- get_random_bytes(rndvec, sizeof(rndvec));
- lnk->psn_initial = rndvec[0] + (rndvec[1] << 8) +
- (rndvec[2] << 16);
- rc = smc_ib_determine_gid(lnk->smcibdev, lnk->ibport,
- ini->vlan_id, lnk->gid, &lnk->sgid_index);
- if (rc)
- goto out;
- rc = smc_llc_link_init(lnk);
- if (rc)
- goto out;
- rc = smc_wr_alloc_link_mem(lnk);
- if (rc)
- goto clear_llc_lnk;
- rc = smc_ib_create_protection_domain(lnk);
- if (rc)
- goto free_link_mem;
- rc = smc_ib_create_queue_pair(lnk);
- if (rc)
- goto dealloc_pd;
- rc = smc_wr_create_link(lnk);
- if (rc)
- goto destroy_qp;
- lnk->state = SMC_LNK_ACTIVATING;
- return 0;
- destroy_qp:
- smc_ib_destroy_queue_pair(lnk);
- dealloc_pd:
- smc_ib_dealloc_protection_domain(lnk);
- free_link_mem:
- smc_wr_free_link_mem(lnk);
- clear_llc_lnk:
- smc_llc_link_clear(lnk, false);
- out:
- put_device(&ini->ib_dev->ibdev->dev);
- memset(lnk, 0, sizeof(struct smc_link));
- lnk->state = SMC_LNK_UNUSED;
- if (!atomic_dec_return(&ini->ib_dev->lnk_cnt))
- wake_up(&ini->ib_dev->lnks_deleted);
- return rc;
- }
- /* create a new SMC link group */
- static int smc_lgr_create(struct smc_sock *smc, struct smc_init_info *ini)
- {
- struct smc_link_group *lgr;
- struct list_head *lgr_list;
- struct smc_link *lnk;
- spinlock_t *lgr_lock;
- u8 link_idx;
- int rc = 0;
- int i;
- if (ini->is_smcd && ini->vlan_id) {
- if (smc_ism_get_vlan(ini->ism_dev[ini->ism_selected],
- ini->vlan_id)) {
- rc = SMC_CLC_DECL_ISMVLANERR;
- goto out;
- }
- }
- lgr = kzalloc(sizeof(*lgr), GFP_KERNEL);
- if (!lgr) {
- rc = SMC_CLC_DECL_MEM;
- goto ism_put_vlan;
- }
- lgr->tx_wq = alloc_workqueue("smc_tx_wq-%*phN", 0, 0,
- SMC_LGR_ID_SIZE, &lgr->id);
- if (!lgr->tx_wq) {
- rc = -ENOMEM;
- goto free_lgr;
- }
- lgr->is_smcd = ini->is_smcd;
- lgr->sync_err = 0;
- lgr->terminating = 0;
- lgr->freeing = 0;
- lgr->vlan_id = ini->vlan_id;
- mutex_init(&lgr->sndbufs_lock);
- mutex_init(&lgr->rmbs_lock);
- rwlock_init(&lgr->conns_lock);
- for (i = 0; i < SMC_RMBE_SIZES; i++) {
- INIT_LIST_HEAD(&lgr->sndbufs[i]);
- INIT_LIST_HEAD(&lgr->rmbs[i]);
- }
- lgr->next_link_id = 0;
- smc_lgr_list.num += SMC_LGR_NUM_INCR;
- memcpy(&lgr->id, (u8 *)&smc_lgr_list.num, SMC_LGR_ID_SIZE);
- INIT_DELAYED_WORK(&lgr->free_work, smc_lgr_free_work);
- INIT_WORK(&lgr->terminate_work, smc_lgr_terminate_work);
- lgr->conns_all = RB_ROOT;
- if (ini->is_smcd) {
- /* SMC-D specific settings */
- get_device(&ini->ism_dev[ini->ism_selected]->dev);
- lgr->peer_gid = ini->ism_peer_gid[ini->ism_selected];
- lgr->smcd = ini->ism_dev[ini->ism_selected];
- lgr_list = &ini->ism_dev[ini->ism_selected]->lgr_list;
- lgr_lock = &lgr->smcd->lgr_lock;
- lgr->smc_version = ini->smcd_version;
- lgr->peer_shutdown = 0;
- atomic_inc(&ini->ism_dev[ini->ism_selected]->lgr_cnt);
- } else {
- /* SMC-R specific settings */
- lgr->role = smc->listen_smc ? SMC_SERV : SMC_CLNT;
- memcpy(lgr->peer_systemid, ini->ib_lcl->id_for_peer,
- SMC_SYSTEMID_LEN);
- memcpy(lgr->pnet_id, ini->ib_dev->pnetid[ini->ib_port - 1],
- SMC_MAX_PNETID_LEN);
- smc_llc_lgr_init(lgr, smc);
- link_idx = SMC_SINGLE_LINK;
- lnk = &lgr->lnk[link_idx];
- rc = smcr_link_init(lgr, lnk, link_idx, ini);
- if (rc)
- goto free_wq;
- lgr_list = &smc_lgr_list.list;
- lgr_lock = &smc_lgr_list.lock;
- atomic_inc(&lgr_cnt);
- }
- smc->conn.lgr = lgr;
- spin_lock_bh(lgr_lock);
- list_add_tail(&lgr->list, lgr_list);
- spin_unlock_bh(lgr_lock);
- return 0;
- free_wq:
- destroy_workqueue(lgr->tx_wq);
- free_lgr:
- kfree(lgr);
- ism_put_vlan:
- if (ini->is_smcd && ini->vlan_id)
- smc_ism_put_vlan(ini->ism_dev[ini->ism_selected], ini->vlan_id);
- out:
- if (rc < 0) {
- if (rc == -ENOMEM)
- rc = SMC_CLC_DECL_MEM;
- else
- rc = SMC_CLC_DECL_INTERR;
- }
- return rc;
- }
- static int smc_write_space(struct smc_connection *conn)
- {
- int buffer_len = conn->peer_rmbe_size;
- union smc_host_cursor prod;
- union smc_host_cursor cons;
- int space;
- smc_curs_copy(&prod, &conn->local_tx_ctrl.prod, conn);
- smc_curs_copy(&cons, &conn->local_rx_ctrl.cons, conn);
- /* determine rx_buf space */
- space = buffer_len - smc_curs_diff(buffer_len, &cons, &prod);
- return space;
- }
- static int smc_switch_cursor(struct smc_sock *smc, struct smc_cdc_tx_pend *pend,
- struct smc_wr_buf *wr_buf)
- {
- struct smc_connection *conn = &smc->conn;
- union smc_host_cursor cons, fin;
- int rc = 0;
- int diff;
- smc_curs_copy(&conn->tx_curs_sent, &conn->tx_curs_fin, conn);
- smc_curs_copy(&fin, &conn->local_tx_ctrl_fin, conn);
- /* set prod cursor to old state, enforce tx_rdma_writes() */
- smc_curs_copy(&conn->local_tx_ctrl.prod, &fin, conn);
- smc_curs_copy(&cons, &conn->local_rx_ctrl.cons, conn);
- if (smc_curs_comp(conn->peer_rmbe_size, &cons, &fin) < 0) {
- /* cons cursor advanced more than fin, and prod was set
- * fin above, so now prod is smaller than cons. Fix that.
- */
- diff = smc_curs_diff(conn->peer_rmbe_size, &fin, &cons);
- smc_curs_add(conn->sndbuf_desc->len,
- &conn->tx_curs_sent, diff);
- smc_curs_add(conn->sndbuf_desc->len,
- &conn->tx_curs_fin, diff);
- smp_mb__before_atomic();
- atomic_add(diff, &conn->sndbuf_space);
- smp_mb__after_atomic();
- smc_curs_add(conn->peer_rmbe_size,
- &conn->local_tx_ctrl.prod, diff);
- smc_curs_add(conn->peer_rmbe_size,
- &conn->local_tx_ctrl_fin, diff);
- }
- /* recalculate, value is used by tx_rdma_writes() */
- atomic_set(&smc->conn.peer_rmbe_space, smc_write_space(conn));
- if (smc->sk.sk_state != SMC_INIT &&
- smc->sk.sk_state != SMC_CLOSED) {
- rc = smcr_cdc_msg_send_validation(conn, pend, wr_buf);
- if (!rc) {
- queue_delayed_work(conn->lgr->tx_wq, &conn->tx_work, 0);
- smc->sk.sk_data_ready(&smc->sk);
- }
- } else {
- smc_wr_tx_put_slot(conn->lnk,
- (struct smc_wr_tx_pend_priv *)pend);
- }
- return rc;
- }
- struct smc_link *smc_switch_conns(struct smc_link_group *lgr,
- struct smc_link *from_lnk, bool is_dev_err)
- {
- struct smc_link *to_lnk = NULL;
- struct smc_cdc_tx_pend *pend;
- struct smc_connection *conn;
- struct smc_wr_buf *wr_buf;
- struct smc_sock *smc;
- struct rb_node *node;
- int i, rc = 0;
- /* link is inactive, wake up tx waiters */
- smc_wr_wakeup_tx_wait(from_lnk);
- for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
- if (!smc_link_active(&lgr->lnk[i]) || i == from_lnk->link_idx)
- continue;
- if (is_dev_err && from_lnk->smcibdev == lgr->lnk[i].smcibdev &&
- from_lnk->ibport == lgr->lnk[i].ibport) {
- continue;
- }
- to_lnk = &lgr->lnk[i];
- break;
- }
- if (!to_lnk || !smc_wr_tx_link_hold(to_lnk)) {
- smc_lgr_terminate_sched(lgr);
- return NULL;
- }
- again:
- read_lock_bh(&lgr->conns_lock);
- for (node = rb_first(&lgr->conns_all); node; node = rb_next(node)) {
- conn = rb_entry(node, struct smc_connection, alert_node);
- if (conn->lnk != from_lnk)
- continue;
- smc = container_of(conn, struct smc_sock, conn);
- /* conn->lnk not yet set in SMC_INIT state */
- if (smc->sk.sk_state == SMC_INIT)
- continue;
- if (smc->sk.sk_state == SMC_CLOSED ||
- smc->sk.sk_state == SMC_PEERCLOSEWAIT1 ||
- smc->sk.sk_state == SMC_PEERCLOSEWAIT2 ||
- smc->sk.sk_state == SMC_APPFINCLOSEWAIT ||
- smc->sk.sk_state == SMC_APPCLOSEWAIT1 ||
- smc->sk.sk_state == SMC_APPCLOSEWAIT2 ||
- smc->sk.sk_state == SMC_PEERFINCLOSEWAIT ||
- smc->sk.sk_state == SMC_PEERABORTWAIT ||
- smc->sk.sk_state == SMC_PROCESSABORT) {
- spin_lock_bh(&conn->send_lock);
- conn->lnk = to_lnk;
- spin_unlock_bh(&conn->send_lock);
- continue;
- }
- sock_hold(&smc->sk);
- read_unlock_bh(&lgr->conns_lock);
- /* pre-fetch buffer outside of send_lock, might sleep */
- rc = smc_cdc_get_free_slot(conn, to_lnk, &wr_buf, NULL, &pend);
- if (rc)
- goto err_out;
- /* avoid race with smcr_tx_sndbuf_nonempty() */
- spin_lock_bh(&conn->send_lock);
- conn->lnk = to_lnk;
- rc = smc_switch_cursor(smc, pend, wr_buf);
- spin_unlock_bh(&conn->send_lock);
- sock_put(&smc->sk);
- if (rc)
- goto err_out;
- goto again;
- }
- read_unlock_bh(&lgr->conns_lock);
- smc_wr_tx_link_put(to_lnk);
- return to_lnk;
- err_out:
- smcr_link_down_cond_sched(to_lnk);
- smc_wr_tx_link_put(to_lnk);
- return NULL;
- }
- static void smcr_buf_unuse(struct smc_buf_desc *rmb_desc,
- struct smc_link_group *lgr)
- {
- int rc;
- if (rmb_desc->is_conf_rkey && !list_empty(&lgr->list)) {
- /* unregister rmb with peer */
- rc = smc_llc_flow_initiate(lgr, SMC_LLC_FLOW_RKEY);
- if (!rc) {
- /* protect against smc_llc_cli_rkey_exchange() */
- mutex_lock(&lgr->llc_conf_mutex);
- smc_llc_do_delete_rkey(lgr, rmb_desc);
- rmb_desc->is_conf_rkey = false;
- mutex_unlock(&lgr->llc_conf_mutex);
- smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl);
- }
- }
- if (rmb_desc->is_reg_err) {
- /* buf registration failed, reuse not possible */
- mutex_lock(&lgr->rmbs_lock);
- list_del(&rmb_desc->list);
- mutex_unlock(&lgr->rmbs_lock);
- smc_buf_free(lgr, true, rmb_desc);
- } else {
- rmb_desc->used = 0;
- }
- }
- static void smc_buf_unuse(struct smc_connection *conn,
- struct smc_link_group *lgr)
- {
- if (conn->sndbuf_desc)
- conn->sndbuf_desc->used = 0;
- if (conn->rmb_desc && lgr->is_smcd)
- conn->rmb_desc->used = 0;
- else if (conn->rmb_desc)
- smcr_buf_unuse(conn->rmb_desc, lgr);
- }
- /* remove a finished connection from its link group */
- void smc_conn_free(struct smc_connection *conn)
- {
- struct smc_link_group *lgr = conn->lgr;
- if (!lgr)
- return;
- if (lgr->is_smcd) {
- if (!list_empty(&lgr->list))
- smc_ism_unset_conn(conn);
- tasklet_kill(&conn->rx_tsklet);
- } else {
- smc_cdc_wait_pend_tx_wr(conn);
- if (current_work() != &conn->abort_work)
- cancel_work_sync(&conn->abort_work);
- }
- if (!list_empty(&lgr->list)) {
- smc_buf_unuse(conn, lgr); /* allow buffer reuse */
- smc_lgr_unregister_conn(conn);
- }
- if (!lgr->conns_num)
- smc_lgr_schedule_free_work(lgr);
- }
- /* unregister a link from a buf_desc */
- static void smcr_buf_unmap_link(struct smc_buf_desc *buf_desc, bool is_rmb,
- struct smc_link *lnk)
- {
- if (is_rmb)
- buf_desc->is_reg_mr[lnk->link_idx] = false;
- if (!buf_desc->is_map_ib[lnk->link_idx])
- return;
- if (is_rmb) {
- if (buf_desc->mr_rx[lnk->link_idx]) {
- smc_ib_put_memory_region(
- buf_desc->mr_rx[lnk->link_idx]);
- buf_desc->mr_rx[lnk->link_idx] = NULL;
- }
- smc_ib_buf_unmap_sg(lnk, buf_desc, DMA_FROM_DEVICE);
- } else {
- smc_ib_buf_unmap_sg(lnk, buf_desc, DMA_TO_DEVICE);
- }
- sg_free_table(&buf_desc->sgt[lnk->link_idx]);
- buf_desc->is_map_ib[lnk->link_idx] = false;
- }
- /* unmap all buffers of lgr for a deleted link */
- static void smcr_buf_unmap_lgr(struct smc_link *lnk)
- {
- struct smc_link_group *lgr = lnk->lgr;
- struct smc_buf_desc *buf_desc, *bf;
- int i;
- for (i = 0; i < SMC_RMBE_SIZES; i++) {
- mutex_lock(&lgr->rmbs_lock);
- list_for_each_entry_safe(buf_desc, bf, &lgr->rmbs[i], list)
- smcr_buf_unmap_link(buf_desc, true, lnk);
- mutex_unlock(&lgr->rmbs_lock);
- mutex_lock(&lgr->sndbufs_lock);
- list_for_each_entry_safe(buf_desc, bf, &lgr->sndbufs[i],
- list)
- smcr_buf_unmap_link(buf_desc, false, lnk);
- mutex_unlock(&lgr->sndbufs_lock);
- }
- }
- static void smcr_rtoken_clear_link(struct smc_link *lnk)
- {
- struct smc_link_group *lgr = lnk->lgr;
- int i;
- for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) {
- lgr->rtokens[i][lnk->link_idx].rkey = 0;
- lgr->rtokens[i][lnk->link_idx].dma_addr = 0;
- }
- }
- /* must be called under lgr->llc_conf_mutex lock */
- void smcr_link_clear(struct smc_link *lnk, bool log)
- {
- struct smc_ib_device *smcibdev;
- if (!lnk->lgr || lnk->state == SMC_LNK_UNUSED)
- return;
- lnk->peer_qpn = 0;
- smc_llc_link_clear(lnk, log);
- smcr_buf_unmap_lgr(lnk);
- smcr_rtoken_clear_link(lnk);
- smc_ib_modify_qp_error(lnk);
- smc_wr_free_link(lnk);
- smc_ib_destroy_queue_pair(lnk);
- smc_ib_dealloc_protection_domain(lnk);
- smc_wr_free_link_mem(lnk);
- put_device(&lnk->smcibdev->ibdev->dev);
- smcibdev = lnk->smcibdev;
- memset(lnk, 0, sizeof(struct smc_link));
- lnk->state = SMC_LNK_UNUSED;
- if (!atomic_dec_return(&smcibdev->lnk_cnt))
- wake_up(&smcibdev->lnks_deleted);
- }
- static void smcr_buf_free(struct smc_link_group *lgr, bool is_rmb,
- struct smc_buf_desc *buf_desc)
- {
- int i;
- for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++)
- smcr_buf_unmap_link(buf_desc, is_rmb, &lgr->lnk[i]);
- if (buf_desc->pages)
- __free_pages(buf_desc->pages, buf_desc->order);
- kfree(buf_desc);
- }
- static void smcd_buf_free(struct smc_link_group *lgr, bool is_dmb,
- struct smc_buf_desc *buf_desc)
- {
- if (is_dmb) {
- /* restore original buf len */
- buf_desc->len += sizeof(struct smcd_cdc_msg);
- smc_ism_unregister_dmb(lgr->smcd, buf_desc);
- } else {
- kfree(buf_desc->cpu_addr);
- }
- kfree(buf_desc);
- }
- static void smc_buf_free(struct smc_link_group *lgr, bool is_rmb,
- struct smc_buf_desc *buf_desc)
- {
- if (lgr->is_smcd)
- smcd_buf_free(lgr, is_rmb, buf_desc);
- else
- smcr_buf_free(lgr, is_rmb, buf_desc);
- }
- static void __smc_lgr_free_bufs(struct smc_link_group *lgr, bool is_rmb)
- {
- struct smc_buf_desc *buf_desc, *bf_desc;
- struct list_head *buf_list;
- int i;
- for (i = 0; i < SMC_RMBE_SIZES; i++) {
- if (is_rmb)
- buf_list = &lgr->rmbs[i];
- else
- buf_list = &lgr->sndbufs[i];
- list_for_each_entry_safe(buf_desc, bf_desc, buf_list,
- list) {
- list_del(&buf_desc->list);
- smc_buf_free(lgr, is_rmb, buf_desc);
- }
- }
- }
- static void smc_lgr_free_bufs(struct smc_link_group *lgr)
- {
- /* free send buffers */
- __smc_lgr_free_bufs(lgr, false);
- /* free rmbs */
- __smc_lgr_free_bufs(lgr, true);
- }
- /* remove a link group */
- static void smc_lgr_free(struct smc_link_group *lgr)
- {
- int i;
- if (!lgr->is_smcd) {
- mutex_lock(&lgr->llc_conf_mutex);
- for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
- if (lgr->lnk[i].state != SMC_LNK_UNUSED)
- smcr_link_clear(&lgr->lnk[i], false);
- }
- mutex_unlock(&lgr->llc_conf_mutex);
- smc_llc_lgr_clear(lgr);
- }
- smc_lgr_free_bufs(lgr);
- destroy_workqueue(lgr->tx_wq);
- if (lgr->is_smcd) {
- smc_ism_put_vlan(lgr->smcd, lgr->vlan_id);
- put_device(&lgr->smcd->dev);
- if (!atomic_dec_return(&lgr->smcd->lgr_cnt))
- wake_up(&lgr->smcd->lgrs_deleted);
- } else {
- if (!atomic_dec_return(&lgr_cnt))
- wake_up(&lgrs_deleted);
- }
- kfree(lgr);
- }
- static void smcd_unregister_all_dmbs(struct smc_link_group *lgr)
- {
- int i;
- for (i = 0; i < SMC_RMBE_SIZES; i++) {
- struct smc_buf_desc *buf_desc;
- list_for_each_entry(buf_desc, &lgr->rmbs[i], list) {
- buf_desc->len += sizeof(struct smcd_cdc_msg);
- smc_ism_unregister_dmb(lgr->smcd, buf_desc);
- }
- }
- }
- static void smc_sk_wake_ups(struct smc_sock *smc)
- {
- smc->sk.sk_write_space(&smc->sk);
- smc->sk.sk_data_ready(&smc->sk);
- smc->sk.sk_state_change(&smc->sk);
- }
- /* kill a connection */
- static void smc_conn_kill(struct smc_connection *conn, bool soft)
- {
- struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
- if (conn->lgr->is_smcd && conn->lgr->peer_shutdown)
- conn->local_tx_ctrl.conn_state_flags.peer_conn_abort = 1;
- else
- smc_close_abort(conn);
- conn->killed = 1;
- smc->sk.sk_err = ECONNABORTED;
- smc_sk_wake_ups(smc);
- if (conn->lgr->is_smcd) {
- smc_ism_unset_conn(conn);
- if (soft)
- tasklet_kill(&conn->rx_tsklet);
- else
- tasklet_unlock_wait(&conn->rx_tsklet);
- } else {
- smc_cdc_wait_pend_tx_wr(conn);
- }
- smc_lgr_unregister_conn(conn);
- smc_close_active_abort(smc);
- }
- static void smc_lgr_cleanup(struct smc_link_group *lgr)
- {
- if (lgr->is_smcd) {
- smc_ism_signal_shutdown(lgr);
- smcd_unregister_all_dmbs(lgr);
- } else {
- u32 rsn = lgr->llc_termination_rsn;
- if (!rsn)
- rsn = SMC_LLC_DEL_PROG_INIT_TERM;
- smc_llc_send_link_delete_all(lgr, false, rsn);
- smcr_lgr_link_deactivate_all(lgr);
- }
- }
- /* terminate link group
- * @soft: true if link group shutdown can take its time
- * false if immediate link group shutdown is required
- */
- static void __smc_lgr_terminate(struct smc_link_group *lgr, bool soft)
- {
- struct smc_connection *conn;
- struct smc_sock *smc;
- struct rb_node *node;
- if (lgr->terminating)
- return; /* lgr already terminating */
- /* cancel free_work sync, will terminate when lgr->freeing is set */
- cancel_delayed_work_sync(&lgr->free_work);
- lgr->terminating = 1;
- /* kill remaining link group connections */
- read_lock_bh(&lgr->conns_lock);
- node = rb_first(&lgr->conns_all);
- while (node) {
- read_unlock_bh(&lgr->conns_lock);
- conn = rb_entry(node, struct smc_connection, alert_node);
- smc = container_of(conn, struct smc_sock, conn);
- sock_hold(&smc->sk); /* sock_put below */
- lock_sock(&smc->sk);
- smc_conn_kill(conn, soft);
- release_sock(&smc->sk);
- sock_put(&smc->sk); /* sock_hold above */
- read_lock_bh(&lgr->conns_lock);
- node = rb_first(&lgr->conns_all);
- }
- read_unlock_bh(&lgr->conns_lock);
- smc_lgr_cleanup(lgr);
- smc_lgr_free(lgr);
- }
- /* unlink link group and schedule termination */
- void smc_lgr_terminate_sched(struct smc_link_group *lgr)
- {
- spinlock_t *lgr_lock;
- smc_lgr_list_head(lgr, &lgr_lock);
- spin_lock_bh(lgr_lock);
- if (list_empty(&lgr->list) || lgr->terminating || lgr->freeing) {
- spin_unlock_bh(lgr_lock);
- return; /* lgr already terminating */
- }
- list_del_init(&lgr->list);
- lgr->freeing = 1;
- spin_unlock_bh(lgr_lock);
- schedule_work(&lgr->terminate_work);
- }
- /* Called when peer lgr shutdown (regularly or abnormally) is received */
- void smc_smcd_terminate(struct smcd_dev *dev, u64 peer_gid, unsigned short vlan)
- {
- struct smc_link_group *lgr, *l;
- LIST_HEAD(lgr_free_list);
- /* run common cleanup function and build free list */
- spin_lock_bh(&dev->lgr_lock);
- list_for_each_entry_safe(lgr, l, &dev->lgr_list, list) {
- if ((!peer_gid || lgr->peer_gid == peer_gid) &&
- (vlan == VLAN_VID_MASK || lgr->vlan_id == vlan)) {
- if (peer_gid) /* peer triggered termination */
- lgr->peer_shutdown = 1;
- list_move(&lgr->list, &lgr_free_list);
- lgr->freeing = 1;
- }
- }
- spin_unlock_bh(&dev->lgr_lock);
- /* cancel the regular free workers and actually free lgrs */
- list_for_each_entry_safe(lgr, l, &lgr_free_list, list) {
- list_del_init(&lgr->list);
- schedule_work(&lgr->terminate_work);
- }
- }
- /* Called when an SMCD device is removed or the smc module is unloaded */
- void smc_smcd_terminate_all(struct smcd_dev *smcd)
- {
- struct smc_link_group *lgr, *lg;
- LIST_HEAD(lgr_free_list);
- spin_lock_bh(&smcd->lgr_lock);
- list_splice_init(&smcd->lgr_list, &lgr_free_list);
- list_for_each_entry(lgr, &lgr_free_list, list)
- lgr->freeing = 1;
- spin_unlock_bh(&smcd->lgr_lock);
- list_for_each_entry_safe(lgr, lg, &lgr_free_list, list) {
- list_del_init(&lgr->list);
- __smc_lgr_terminate(lgr, false);
- }
- if (atomic_read(&smcd->lgr_cnt))
- wait_event(smcd->lgrs_deleted, !atomic_read(&smcd->lgr_cnt));
- }
- /* Called when an SMCR device is removed or the smc module is unloaded.
- * If smcibdev is given, all SMCR link groups using this device are terminated.
- * If smcibdev is NULL, all SMCR link groups are terminated.
- */
- void smc_smcr_terminate_all(struct smc_ib_device *smcibdev)
- {
- struct smc_link_group *lgr, *lg;
- LIST_HEAD(lgr_free_list);
- int i;
- spin_lock_bh(&smc_lgr_list.lock);
- if (!smcibdev) {
- list_splice_init(&smc_lgr_list.list, &lgr_free_list);
- list_for_each_entry(lgr, &lgr_free_list, list)
- lgr->freeing = 1;
- } else {
- list_for_each_entry_safe(lgr, lg, &smc_lgr_list.list, list) {
- for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
- if (lgr->lnk[i].smcibdev == smcibdev)
- smcr_link_down_cond_sched(&lgr->lnk[i]);
- }
- }
- }
- spin_unlock_bh(&smc_lgr_list.lock);
- list_for_each_entry_safe(lgr, lg, &lgr_free_list, list) {
- list_del_init(&lgr->list);
- smc_llc_set_termination_rsn(lgr, SMC_LLC_DEL_OP_INIT_TERM);
- __smc_lgr_terminate(lgr, false);
- }
- if (smcibdev) {
- if (atomic_read(&smcibdev->lnk_cnt))
- wait_event(smcibdev->lnks_deleted,
- !atomic_read(&smcibdev->lnk_cnt));
- } else {
- if (atomic_read(&lgr_cnt))
- wait_event(lgrs_deleted, !atomic_read(&lgr_cnt));
- }
- }
- /* set new lgr type and clear all asymmetric link tagging */
- void smcr_lgr_set_type(struct smc_link_group *lgr, enum smc_lgr_type new_type)
- {
- char *lgr_type = "";
- int i;
- for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++)
- if (smc_link_usable(&lgr->lnk[i]))
- lgr->lnk[i].link_is_asym = false;
- if (lgr->type == new_type)
- return;
- lgr->type = new_type;
- switch (lgr->type) {
- case SMC_LGR_NONE:
- lgr_type = "NONE";
- break;
- case SMC_LGR_SINGLE:
- lgr_type = "SINGLE";
- break;
- case SMC_LGR_SYMMETRIC:
- lgr_type = "SYMMETRIC";
- break;
- case SMC_LGR_ASYMMETRIC_PEER:
- lgr_type = "ASYMMETRIC_PEER";
- break;
- case SMC_LGR_ASYMMETRIC_LOCAL:
- lgr_type = "ASYMMETRIC_LOCAL";
- break;
- }
- pr_warn_ratelimited("smc: SMC-R lg %*phN state changed: "
- "%s, pnetid %.16s\n", SMC_LGR_ID_SIZE, &lgr->id,
- lgr_type, lgr->pnet_id);
- }
- /* set new lgr type and tag a link as asymmetric */
- void smcr_lgr_set_type_asym(struct smc_link_group *lgr,
- enum smc_lgr_type new_type, int asym_lnk_idx)
- {
- smcr_lgr_set_type(lgr, new_type);
- lgr->lnk[asym_lnk_idx].link_is_asym = true;
- }
- /* abort connection, abort_work scheduled from tasklet context */
- static void smc_conn_abort_work(struct work_struct *work)
- {
- struct smc_connection *conn = container_of(work,
- struct smc_connection,
- abort_work);
- struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
- lock_sock(&smc->sk);
- smc_conn_kill(conn, true);
- release_sock(&smc->sk);
- sock_put(&smc->sk); /* sock_hold done by schedulers of abort_work */
- }
- void smcr_port_add(struct smc_ib_device *smcibdev, u8 ibport)
- {
- struct smc_link_group *lgr, *n;
- list_for_each_entry_safe(lgr, n, &smc_lgr_list.list, list) {
- struct smc_link *link;
- if (strncmp(smcibdev->pnetid[ibport - 1], lgr->pnet_id,
- SMC_MAX_PNETID_LEN) ||
- lgr->type == SMC_LGR_SYMMETRIC ||
- lgr->type == SMC_LGR_ASYMMETRIC_PEER)
- continue;
- /* trigger local add link processing */
- link = smc_llc_usable_link(lgr);
- if (link)
- smc_llc_add_link_local(link);
- }
- }
- /* link is down - switch connections to alternate link,
- * must be called under lgr->llc_conf_mutex lock
- */
- static void smcr_link_down(struct smc_link *lnk)
- {
- struct smc_link_group *lgr = lnk->lgr;
- struct smc_link *to_lnk;
- int del_link_id;
- if (!lgr || lnk->state == SMC_LNK_UNUSED || list_empty(&lgr->list))
- return;
- to_lnk = smc_switch_conns(lgr, lnk, true);
- if (!to_lnk) { /* no backup link available */
- smcr_link_clear(lnk, true);
- return;
- }
- smcr_lgr_set_type(lgr, SMC_LGR_SINGLE);
- del_link_id = lnk->link_id;
- if (lgr->role == SMC_SERV) {
- /* trigger local delete link processing */
- smc_llc_srv_delete_link_local(to_lnk, del_link_id);
- } else {
- if (lgr->llc_flow_lcl.type != SMC_LLC_FLOW_NONE) {
- /* another llc task is ongoing */
- mutex_unlock(&lgr->llc_conf_mutex);
- wait_event_timeout(lgr->llc_flow_waiter,
- (list_empty(&lgr->list) ||
- lgr->llc_flow_lcl.type == SMC_LLC_FLOW_NONE),
- SMC_LLC_WAIT_TIME);
- mutex_lock(&lgr->llc_conf_mutex);
- }
- if (!list_empty(&lgr->list)) {
- smc_llc_send_delete_link(to_lnk, del_link_id,
- SMC_LLC_REQ, true,
- SMC_LLC_DEL_LOST_PATH);
- smcr_link_clear(lnk, true);
- }
- wake_up(&lgr->llc_flow_waiter); /* wake up next waiter */
- }
- }
- /* must be called under lgr->llc_conf_mutex lock */
- void smcr_link_down_cond(struct smc_link *lnk)
- {
- if (smc_link_downing(&lnk->state))
- smcr_link_down(lnk);
- }
- /* will get the lgr->llc_conf_mutex lock */
- void smcr_link_down_cond_sched(struct smc_link *lnk)
- {
- if (smc_link_downing(&lnk->state))
- schedule_work(&lnk->link_down_wrk);
- }
- void smcr_port_err(struct smc_ib_device *smcibdev, u8 ibport)
- {
- struct smc_link_group *lgr, *n;
- int i;
- list_for_each_entry_safe(lgr, n, &smc_lgr_list.list, list) {
- if (strncmp(smcibdev->pnetid[ibport - 1], lgr->pnet_id,
- SMC_MAX_PNETID_LEN))
- continue; /* lgr is not affected */
- if (list_empty(&lgr->list))
- continue;
- for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
- struct smc_link *lnk = &lgr->lnk[i];
- if (smc_link_usable(lnk) &&
- lnk->smcibdev == smcibdev && lnk->ibport == ibport)
- smcr_link_down_cond_sched(lnk);
- }
- }
- }
- static void smc_link_down_work(struct work_struct *work)
- {
- struct smc_link *link = container_of(work, struct smc_link,
- link_down_wrk);
- struct smc_link_group *lgr = link->lgr;
- if (list_empty(&lgr->list))
- return;
- wake_up_all(&lgr->llc_msg_waiter);
- mutex_lock(&lgr->llc_conf_mutex);
- smcr_link_down(link);
- mutex_unlock(&lgr->llc_conf_mutex);
- }
- static int smc_vlan_by_tcpsk_walk(struct net_device *lower_dev,
- struct netdev_nested_priv *priv)
- {
- unsigned short *vlan_id = (unsigned short *)priv->data;
- if (is_vlan_dev(lower_dev)) {
- *vlan_id = vlan_dev_vlan_id(lower_dev);
- return 1;
- }
- return 0;
- }
- /* Determine vlan of internal TCP socket. */
- int smc_vlan_by_tcpsk(struct socket *clcsock, struct smc_init_info *ini)
- {
- struct dst_entry *dst = sk_dst_get(clcsock->sk);
- struct netdev_nested_priv priv;
- struct net_device *ndev;
- int rc = 0;
- ini->vlan_id = 0;
- if (!dst) {
- rc = -ENOTCONN;
- goto out;
- }
- if (!dst->dev) {
- rc = -ENODEV;
- goto out_rel;
- }
- ndev = dst->dev;
- if (is_vlan_dev(ndev)) {
- ini->vlan_id = vlan_dev_vlan_id(ndev);
- goto out_rel;
- }
- priv.data = (void *)&ini->vlan_id;
- rtnl_lock();
- netdev_walk_all_lower_dev(ndev, smc_vlan_by_tcpsk_walk, &priv);
- rtnl_unlock();
- out_rel:
- dst_release(dst);
- out:
- return rc;
- }
- static bool smcr_lgr_match(struct smc_link_group *lgr,
- struct smc_clc_msg_local *lcl,
- enum smc_lgr_role role, u32 clcqpn)
- {
- int i;
- if (memcmp(lgr->peer_systemid, lcl->id_for_peer, SMC_SYSTEMID_LEN) ||
- lgr->role != role)
- return false;
- for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
- if (!smc_link_active(&lgr->lnk[i]))
- continue;
- if ((lgr->role == SMC_SERV || lgr->lnk[i].peer_qpn == clcqpn) &&
- !memcmp(lgr->lnk[i].peer_gid, &lcl->gid, SMC_GID_SIZE) &&
- !memcmp(lgr->lnk[i].peer_mac, lcl->mac, sizeof(lcl->mac)))
- return true;
- }
- return false;
- }
- static bool smcd_lgr_match(struct smc_link_group *lgr,
- struct smcd_dev *smcismdev, u64 peer_gid)
- {
- return lgr->peer_gid == peer_gid && lgr->smcd == smcismdev;
- }
- /* create a new SMC connection (and a new link group if necessary) */
- int smc_conn_create(struct smc_sock *smc, struct smc_init_info *ini)
- {
- struct smc_connection *conn = &smc->conn;
- struct list_head *lgr_list;
- struct smc_link_group *lgr;
- enum smc_lgr_role role;
- spinlock_t *lgr_lock;
- int rc = 0;
- lgr_list = ini->is_smcd ? &ini->ism_dev[ini->ism_selected]->lgr_list :
- &smc_lgr_list.list;
- lgr_lock = ini->is_smcd ? &ini->ism_dev[ini->ism_selected]->lgr_lock :
- &smc_lgr_list.lock;
- ini->first_contact_local = 1;
- role = smc->listen_smc ? SMC_SERV : SMC_CLNT;
- if (role == SMC_CLNT && ini->first_contact_peer)
- /* create new link group as well */
- goto create;
- /* determine if an existing link group can be reused */
- spin_lock_bh(lgr_lock);
- list_for_each_entry(lgr, lgr_list, list) {
- write_lock_bh(&lgr->conns_lock);
- if ((ini->is_smcd ?
- smcd_lgr_match(lgr, ini->ism_dev[ini->ism_selected],
- ini->ism_peer_gid[ini->ism_selected]) :
- smcr_lgr_match(lgr, ini->ib_lcl, role, ini->ib_clcqpn)) &&
- !lgr->sync_err &&
- (ini->smcd_version == SMC_V2 ||
- lgr->vlan_id == ini->vlan_id) &&
- (role == SMC_CLNT || ini->is_smcd ||
- (lgr->conns_num < SMC_RMBS_PER_LGR_MAX &&
- !bitmap_full(lgr->rtokens_used_mask, SMC_RMBS_PER_LGR_MAX)))) {
- /* link group found */
- ini->first_contact_local = 0;
- conn->lgr = lgr;
- rc = smc_lgr_register_conn(conn, false);
- write_unlock_bh(&lgr->conns_lock);
- if (!rc && delayed_work_pending(&lgr->free_work))
- cancel_delayed_work(&lgr->free_work);
- break;
- }
- write_unlock_bh(&lgr->conns_lock);
- }
- spin_unlock_bh(lgr_lock);
- if (rc)
- return rc;
- if (role == SMC_CLNT && !ini->first_contact_peer &&
- ini->first_contact_local) {
- /* Server reuses a link group, but Client wants to start
- * a new one
- * send out_of_sync decline, reason synchr. error
- */
- return SMC_CLC_DECL_SYNCERR;
- }
- create:
- if (ini->first_contact_local) {
- rc = smc_lgr_create(smc, ini);
- if (rc)
- goto out;
- lgr = conn->lgr;
- write_lock_bh(&lgr->conns_lock);
- rc = smc_lgr_register_conn(conn, true);
- write_unlock_bh(&lgr->conns_lock);
- if (rc)
- goto out;
- }
- conn->local_tx_ctrl.common.type = SMC_CDC_MSG_TYPE;
- conn->local_tx_ctrl.len = SMC_WR_TX_SIZE;
- conn->urg_state = SMC_URG_READ;
- init_waitqueue_head(&conn->cdc_pend_tx_wq);
- INIT_WORK(&smc->conn.abort_work, smc_conn_abort_work);
- if (ini->is_smcd) {
- conn->rx_off = sizeof(struct smcd_cdc_msg);
- smcd_cdc_rx_init(conn); /* init tasklet for this conn */
- } else {
- conn->rx_off = 0;
- }
- #ifndef KERNEL_HAS_ATOMIC64
- spin_lock_init(&conn->acurs_lock);
- #endif
- out:
- return rc;
- }
- /* convert the RMB size into the compressed notation - minimum 16K.
- * In contrast to plain ilog2, this rounds towards the next power of 2,
- * so the socket application gets at least its desired sndbuf / rcvbuf size.
- */
- static u8 smc_compress_bufsize(int size)
- {
- u8 compressed;
- if (size <= SMC_BUF_MIN_SIZE)
- return 0;
- size = (size - 1) >> 14;
- compressed = ilog2(size) + 1;
- if (compressed >= SMC_RMBE_SIZES)
- compressed = SMC_RMBE_SIZES - 1;
- return compressed;
- }
- /* convert the RMB size from compressed notation into integer */
- int smc_uncompress_bufsize(u8 compressed)
- {
- u32 size;
- size = 0x00000001 << (((int)compressed) + 14);
- return (int)size;
- }
- /* try to reuse a sndbuf or rmb description slot for a certain
- * buffer size; if not available, return NULL
- */
- static struct smc_buf_desc *smc_buf_get_slot(int compressed_bufsize,
- struct mutex *lock,
- struct list_head *buf_list)
- {
- struct smc_buf_desc *buf_slot;
- mutex_lock(lock);
- list_for_each_entry(buf_slot, buf_list, list) {
- if (cmpxchg(&buf_slot->used, 0, 1) == 0) {
- mutex_unlock(lock);
- return buf_slot;
- }
- }
- mutex_unlock(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 max_t(int, rmbe_size / 10, SOCK_MIN_SNDBUF / 2);
- }
- /* map an rmb buf to a link */
- static int smcr_buf_map_link(struct smc_buf_desc *buf_desc, bool is_rmb,
- struct smc_link *lnk)
- {
- int rc;
- if (buf_desc->is_map_ib[lnk->link_idx])
- return 0;
- rc = sg_alloc_table(&buf_desc->sgt[lnk->link_idx], 1, GFP_KERNEL);
- if (rc)
- return rc;
- sg_set_buf(buf_desc->sgt[lnk->link_idx].sgl,
- buf_desc->cpu_addr, buf_desc->len);
- /* map sg table to DMA address */
- rc = smc_ib_buf_map_sg(lnk, buf_desc,
- is_rmb ? DMA_FROM_DEVICE : DMA_TO_DEVICE);
- /* SMC protocol depends on mapping to one DMA address only */
- if (rc != 1) {
- rc = -EAGAIN;
- goto free_table;
- }
- /* 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, lnk->link_idx);
- if (rc)
- goto buf_unmap;
- smc_ib_sync_sg_for_device(lnk, buf_desc, DMA_FROM_DEVICE);
- }
- buf_desc->is_map_ib[lnk->link_idx] = true;
- return 0;
- buf_unmap:
- smc_ib_buf_unmap_sg(lnk, buf_desc,
- is_rmb ? DMA_FROM_DEVICE : DMA_TO_DEVICE);
- free_table:
- sg_free_table(&buf_desc->sgt[lnk->link_idx]);
- return rc;
- }
- /* register a new rmb on IB device,
- * must be called under lgr->llc_conf_mutex lock
- */
- int smcr_link_reg_rmb(struct smc_link *link, struct smc_buf_desc *rmb_desc)
- {
- if (list_empty(&link->lgr->list))
- return -ENOLINK;
- if (!rmb_desc->is_reg_mr[link->link_idx]) {
- /* register memory region for new rmb */
- if (smc_wr_reg_send(link, rmb_desc->mr_rx[link->link_idx])) {
- rmb_desc->is_reg_err = true;
- return -EFAULT;
- }
- rmb_desc->is_reg_mr[link->link_idx] = true;
- }
- return 0;
- }
- static int _smcr_buf_map_lgr(struct smc_link *lnk, struct mutex *lock,
- struct list_head *lst, bool is_rmb)
- {
- struct smc_buf_desc *buf_desc, *bf;
- int rc = 0;
- mutex_lock(lock);
- list_for_each_entry_safe(buf_desc, bf, lst, list) {
- if (!buf_desc->used)
- continue;
- rc = smcr_buf_map_link(buf_desc, is_rmb, lnk);
- if (rc)
- goto out;
- }
- out:
- mutex_unlock(lock);
- return rc;
- }
- /* map all used buffers of lgr for a new link */
- int smcr_buf_map_lgr(struct smc_link *lnk)
- {
- struct smc_link_group *lgr = lnk->lgr;
- int i, rc = 0;
- for (i = 0; i < SMC_RMBE_SIZES; i++) {
- rc = _smcr_buf_map_lgr(lnk, &lgr->rmbs_lock,
- &lgr->rmbs[i], true);
- if (rc)
- return rc;
- rc = _smcr_buf_map_lgr(lnk, &lgr->sndbufs_lock,
- &lgr->sndbufs[i], false);
- if (rc)
- return rc;
- }
- return 0;
- }
- /* register all used buffers of lgr for a new link,
- * must be called under lgr->llc_conf_mutex lock
- */
- int smcr_buf_reg_lgr(struct smc_link *lnk)
- {
- struct smc_link_group *lgr = lnk->lgr;
- struct smc_buf_desc *buf_desc, *bf;
- int i, rc = 0;
- mutex_lock(&lgr->rmbs_lock);
- for (i = 0; i < SMC_RMBE_SIZES; i++) {
- list_for_each_entry_safe(buf_desc, bf, &lgr->rmbs[i], list) {
- if (!buf_desc->used)
- continue;
- rc = smcr_link_reg_rmb(lnk, buf_desc);
- if (rc)
- goto out;
- }
- }
- out:
- mutex_unlock(&lgr->rmbs_lock);
- return rc;
- }
- static struct smc_buf_desc *smcr_new_buf_create(struct smc_link_group *lgr,
- bool is_rmb, int bufsize)
- {
- struct smc_buf_desc *buf_desc;
- /* try to alloc a new buffer */
- buf_desc = kzalloc(sizeof(*buf_desc), GFP_KERNEL);
- if (!buf_desc)
- return ERR_PTR(-ENOMEM);
- buf_desc->order = get_order(bufsize);
- buf_desc->pages = alloc_pages(GFP_KERNEL | __GFP_NOWARN |
- __GFP_NOMEMALLOC | __GFP_COMP |
- __GFP_NORETRY | __GFP_ZERO,
- buf_desc->order);
- if (!buf_desc->pages) {
- kfree(buf_desc);
- return ERR_PTR(-EAGAIN);
- }
- buf_desc->cpu_addr = (void *)page_address(buf_desc->pages);
- buf_desc->len = bufsize;
- return buf_desc;
- }
- /* map buf_desc on all usable links,
- * unused buffers stay mapped as long as the link is up
- */
- static int smcr_buf_map_usable_links(struct smc_link_group *lgr,
- struct smc_buf_desc *buf_desc, bool is_rmb)
- {
- int i, rc = 0;
- /* protect against parallel link reconfiguration */
- mutex_lock(&lgr->llc_conf_mutex);
- for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
- struct smc_link *lnk = &lgr->lnk[i];
- if (!smc_link_usable(lnk))
- continue;
- if (smcr_buf_map_link(buf_desc, is_rmb, lnk)) {
- rc = -ENOMEM;
- goto out;
- }
- }
- out:
- mutex_unlock(&lgr->llc_conf_mutex);
- return rc;
- }
- #define SMCD_DMBE_SIZES 6 /* 0 -> 16KB, 1 -> 32KB, .. 6 -> 1MB */
- static struct smc_buf_desc *smcd_new_buf_create(struct smc_link_group *lgr,
- bool is_dmb, int bufsize)
- {
- struct smc_buf_desc *buf_desc;
- int rc;
- if (smc_compress_bufsize(bufsize) > SMCD_DMBE_SIZES)
- return ERR_PTR(-EAGAIN);
- /* try to alloc a new DMB */
- buf_desc = kzalloc(sizeof(*buf_desc), GFP_KERNEL);
- if (!buf_desc)
- return ERR_PTR(-ENOMEM);
- if (is_dmb) {
- rc = smc_ism_register_dmb(lgr, bufsize, buf_desc);
- if (rc) {
- kfree(buf_desc);
- if (rc == -ENOMEM)
- return ERR_PTR(-EAGAIN);
- if (rc == -ENOSPC)
- return ERR_PTR(-ENOSPC);
- return ERR_PTR(-EIO);
- }
- buf_desc->pages = virt_to_page(buf_desc->cpu_addr);
- /* CDC header stored in buf. So, pretend it was smaller */
- buf_desc->len = bufsize - sizeof(struct smcd_cdc_msg);
- } else {
- buf_desc->cpu_addr = kzalloc(bufsize, GFP_KERNEL |
- __GFP_NOWARN | __GFP_NORETRY |
- __GFP_NOMEMALLOC);
- if (!buf_desc->cpu_addr) {
- kfree(buf_desc);
- return ERR_PTR(-EAGAIN);
- }
- buf_desc->len = bufsize;
- }
- return buf_desc;
- }
- static int __smc_buf_create(struct smc_sock *smc, bool is_smcd, bool is_rmb)
- {
- struct smc_buf_desc *buf_desc = ERR_PTR(-ENOMEM);
- struct smc_connection *conn = &smc->conn;
- struct smc_link_group *lgr = conn->lgr;
- struct list_head *buf_list;
- int bufsize, bufsize_short;
- struct mutex *lock; /* lock buffer list */
- int sk_buf_size;
- 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(bufsize_short, lock, buf_list);
- if (buf_desc) {
- memset(buf_desc->cpu_addr, 0, bufsize);
- break; /* found reusable slot */
- }
- if (is_smcd)
- buf_desc = smcd_new_buf_create(lgr, is_rmb, bufsize);
- else
- buf_desc = smcr_new_buf_create(lgr, is_rmb, bufsize);
- if (PTR_ERR(buf_desc) == -ENOMEM)
- break;
- if (IS_ERR(buf_desc))
- continue;
- buf_desc->used = 1;
- mutex_lock(lock);
- list_add(&buf_desc->list, buf_list);
- mutex_unlock(lock);
- break; /* found */
- }
- if (IS_ERR(buf_desc))
- return PTR_ERR(buf_desc);
- if (!is_smcd) {
- if (smcr_buf_map_usable_links(lgr, buf_desc, is_rmb)) {
- smcr_buf_unuse(buf_desc, lgr);
- return -ENOMEM;
- }
- }
- if (is_rmb) {
- conn->rmb_desc = buf_desc;
- 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(buf_desc->len);
- if (is_smcd)
- smc_ism_set_conn(conn); /* map RMB/smcd_dev to conn */
- } else {
- conn->sndbuf_desc = buf_desc;
- 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)
- {
- if (!conn->lgr || conn->lgr->is_smcd || !smc_link_active(conn->lnk))
- return;
- smc_ib_sync_sg_for_cpu(conn->lnk, conn->sndbuf_desc, DMA_TO_DEVICE);
- }
- void smc_sndbuf_sync_sg_for_device(struct smc_connection *conn)
- {
- if (!conn->lgr || conn->lgr->is_smcd || !smc_link_active(conn->lnk))
- return;
- smc_ib_sync_sg_for_device(conn->lnk, conn->sndbuf_desc, DMA_TO_DEVICE);
- }
- void smc_rmb_sync_sg_for_cpu(struct smc_connection *conn)
- {
- int i;
- if (!conn->lgr || conn->lgr->is_smcd)
- return;
- for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
- if (!smc_link_active(&conn->lgr->lnk[i]))
- continue;
- smc_ib_sync_sg_for_cpu(&conn->lgr->lnk[i], conn->rmb_desc,
- DMA_FROM_DEVICE);
- }
- }
- void smc_rmb_sync_sg_for_device(struct smc_connection *conn)
- {
- int i;
- if (!conn->lgr || conn->lgr->is_smcd)
- return;
- for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
- if (!smc_link_active(&conn->lgr->lnk[i]))
- continue;
- smc_ib_sync_sg_for_device(&conn->lgr->lnk[i], 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, bool is_smcd)
- {
- int rc;
- /* create send buffer */
- rc = __smc_buf_create(smc, is_smcd, false);
- if (rc)
- return rc;
- /* create rmb */
- rc = __smc_buf_create(smc, is_smcd, true);
- if (rc) {
- mutex_lock(&smc->conn.lgr->sndbufs_lock);
- list_del(&smc->conn.sndbuf_desc->list);
- mutex_unlock(&smc->conn.lgr->sndbufs_lock);
- smc_buf_free(smc->conn.lgr, false, smc->conn.sndbuf_desc);
- smc->conn.sndbuf_desc = NULL;
- }
- 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;
- }
- static int smc_rtoken_find_by_link(struct smc_link_group *lgr, int lnk_idx,
- u32 rkey)
- {
- int i;
- for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) {
- if (test_bit(i, lgr->rtokens_used_mask) &&
- lgr->rtokens[i][lnk_idx].rkey == rkey)
- return i;
- }
- return -ENOENT;
- }
- /* set rtoken for a new link to an existing rmb */
- void smc_rtoken_set(struct smc_link_group *lgr, int link_idx, int link_idx_new,
- __be32 nw_rkey_known, __be64 nw_vaddr, __be32 nw_rkey)
- {
- int rtok_idx;
- rtok_idx = smc_rtoken_find_by_link(lgr, link_idx, ntohl(nw_rkey_known));
- if (rtok_idx == -ENOENT)
- return;
- lgr->rtokens[rtok_idx][link_idx_new].rkey = ntohl(nw_rkey);
- lgr->rtokens[rtok_idx][link_idx_new].dma_addr = be64_to_cpu(nw_vaddr);
- }
- /* set rtoken for a new link whose link_id is given */
- void smc_rtoken_set2(struct smc_link_group *lgr, int rtok_idx, int link_id,
- __be64 nw_vaddr, __be32 nw_rkey)
- {
- u64 dma_addr = be64_to_cpu(nw_vaddr);
- u32 rkey = ntohl(nw_rkey);
- bool found = false;
- int link_idx;
- for (link_idx = 0; link_idx < SMC_LINKS_PER_LGR_MAX; link_idx++) {
- if (lgr->lnk[link_idx].link_id == link_id) {
- found = true;
- break;
- }
- }
- if (!found)
- return;
- lgr->rtokens[rtok_idx][link_idx].rkey = rkey;
- lgr->rtokens[rtok_idx][link_idx].dma_addr = dma_addr;
- }
- /* add a new rtoken from peer */
- int smc_rtoken_add(struct smc_link *lnk, __be64 nw_vaddr, __be32 nw_rkey)
- {
- struct smc_link_group *lgr = smc_get_lgr(lnk);
- u64 dma_addr = be64_to_cpu(nw_vaddr);
- u32 rkey = ntohl(nw_rkey);
- int i;
- for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) {
- if (lgr->rtokens[i][lnk->link_idx].rkey == rkey &&
- lgr->rtokens[i][lnk->link_idx].dma_addr == dma_addr &&
- test_bit(i, lgr->rtokens_used_mask)) {
- /* already in list */
- return i;
- }
- }
- i = smc_rmb_reserve_rtoken_idx(lgr);
- if (i < 0)
- return i;
- lgr->rtokens[i][lnk->link_idx].rkey = rkey;
- lgr->rtokens[i][lnk->link_idx].dma_addr = dma_addr;
- return i;
- }
- /* delete an rtoken from all links */
- int smc_rtoken_delete(struct smc_link *lnk, __be32 nw_rkey)
- {
- struct smc_link_group *lgr = smc_get_lgr(lnk);
- u32 rkey = ntohl(nw_rkey);
- int i, j;
- for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) {
- if (lgr->rtokens[i][lnk->link_idx].rkey == rkey &&
- test_bit(i, lgr->rtokens_used_mask)) {
- for (j = 0; j < SMC_LINKS_PER_LGR_MAX; j++) {
- lgr->rtokens[i][j].rkey = 0;
- lgr->rtokens[i][j].dma_addr = 0;
- }
- clear_bit(i, lgr->rtokens_used_mask);
- return 0;
- }
- }
- return -ENOENT;
- }
- /* save rkey and dma_addr received from peer during clc handshake */
- int smc_rmb_rtoken_handling(struct smc_connection *conn,
- struct smc_link *lnk,
- struct smc_clc_msg_accept_confirm *clc)
- {
- conn->rtoken_idx = smc_rtoken_add(lnk, clc->r0.rmb_dma_addr,
- clc->r0.rmb_rkey);
- if (conn->rtoken_idx < 0)
- return conn->rtoken_idx;
- return 0;
- }
- static void smc_core_going_away(void)
- {
- struct smc_ib_device *smcibdev;
- struct smcd_dev *smcd;
- mutex_lock(&smc_ib_devices.mutex);
- list_for_each_entry(smcibdev, &smc_ib_devices.list, list) {
- int i;
- for (i = 0; i < SMC_MAX_PORTS; i++)
- set_bit(i, smcibdev->ports_going_away);
- }
- mutex_unlock(&smc_ib_devices.mutex);
- mutex_lock(&smcd_dev_list.mutex);
- list_for_each_entry(smcd, &smcd_dev_list.list, list) {
- smcd->going_away = 1;
- }
- mutex_unlock(&smcd_dev_list.mutex);
- }
- /* Clean up all SMC link groups */
- static void smc_lgrs_shutdown(void)
- {
- struct smcd_dev *smcd;
- smc_core_going_away();
- smc_smcr_terminate_all(NULL);
- mutex_lock(&smcd_dev_list.mutex);
- list_for_each_entry(smcd, &smcd_dev_list.list, list)
- smc_smcd_terminate_all(smcd);
- mutex_unlock(&smcd_dev_list.mutex);
- }
- static int smc_core_reboot_event(struct notifier_block *this,
- unsigned long event, void *ptr)
- {
- smc_lgrs_shutdown();
- smc_ib_unregister_client();
- return 0;
- }
- static struct notifier_block smc_reboot_notifier = {
- .notifier_call = smc_core_reboot_event,
- };
- int __init smc_core_init(void)
- {
- return register_reboot_notifier(&smc_reboot_notifier);
- }
- /* Called (from smc_exit) when module is removed */
- void smc_core_exit(void)
- {
- unregister_reboot_notifier(&smc_reboot_notifier);
- smc_lgrs_shutdown();
- }
|