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b8ded9de8d
Pre-fetch send buffer for the CDC validation message before entering the send_lock. Without that the send call might fail with -EBUSY because there are no free buffers and waiting for buffers is not possible under send_lock. Signed-off-by: Karsten Graul <kgraul@linux.ibm.com> Reviewed-by: Ursula Braun <ubraun@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2012 lines
52 KiB
C
2012 lines
52 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 <linux/wait.h>
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#include <linux/reboot.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 <rdma/ib_cache.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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#include "smc_ism.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 * HZ)
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#define SMC_LGR_FREE_DELAY_FAST (8 * HZ)
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static struct smc_lgr_list smc_lgr_list = { /* established link groups */
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.lock = __SPIN_LOCK_UNLOCKED(smc_lgr_list.lock),
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.list = LIST_HEAD_INIT(smc_lgr_list.list),
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.num = 0,
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};
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static atomic_t lgr_cnt = ATOMIC_INIT(0); /* number of existing link groups */
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static DECLARE_WAIT_QUEUE_HEAD(lgrs_deleted);
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struct smc_ib_up_work {
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struct work_struct work;
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struct smc_link_group *lgr;
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struct smc_ib_device *smcibdev;
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u8 ibport;
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};
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static void smc_buf_free(struct smc_link_group *lgr, bool is_rmb,
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struct smc_buf_desc *buf_desc);
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static void __smc_lgr_terminate(struct smc_link_group *lgr, bool soft);
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static void smc_link_up_work(struct work_struct *work);
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static void smc_link_down_work(struct work_struct *work);
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/* return head of link group list and its lock for a given link group */
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static inline struct list_head *smc_lgr_list_head(struct smc_link_group *lgr,
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spinlock_t **lgr_lock)
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{
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if (lgr->is_smcd) {
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*lgr_lock = &lgr->smcd->lgr_lock;
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return &lgr->smcd->lgr_list;
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}
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*lgr_lock = &smc_lgr_list.lock;
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return &smc_lgr_list.list;
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}
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static void smc_lgr_schedule_free_work(struct smc_link_group *lgr)
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{
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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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if (!lgr->freeing && !lgr->freefast) {
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mod_delayed_work(system_wq, &lgr->free_work,
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(!lgr->is_smcd && lgr->role == SMC_CLNT) ?
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SMC_LGR_FREE_DELAY_CLNT :
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SMC_LGR_FREE_DELAY_SERV);
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}
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}
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void smc_lgr_schedule_free_work_fast(struct smc_link_group *lgr)
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{
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if (!lgr->freeing && !lgr->freefast) {
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lgr->freefast = 1;
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mod_delayed_work(system_wq, &lgr->free_work,
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SMC_LGR_FREE_DELAY_FAST);
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}
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}
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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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/* assign an SMC-R link to the connection */
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static int smcr_lgr_conn_assign_link(struct smc_connection *conn, bool first)
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{
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enum smc_link_state expected = first ? SMC_LNK_ACTIVATING :
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SMC_LNK_ACTIVE;
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int i, j;
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/* do link balancing */
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for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
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struct smc_link *lnk = &conn->lgr->lnk[i];
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if (lnk->state != expected || lnk->link_is_asym)
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continue;
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if (conn->lgr->role == SMC_CLNT) {
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conn->lnk = lnk; /* temporary, SMC server assigns link*/
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break;
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}
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if (conn->lgr->conns_num % 2) {
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for (j = i + 1; j < SMC_LINKS_PER_LGR_MAX; j++) {
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struct smc_link *lnk2;
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lnk2 = &conn->lgr->lnk[j];
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if (lnk2->state == expected &&
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!lnk2->link_is_asym) {
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conn->lnk = lnk2;
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break;
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}
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}
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}
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if (!conn->lnk)
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conn->lnk = lnk;
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break;
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}
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if (!conn->lnk)
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return SMC_CLC_DECL_NOACTLINK;
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return 0;
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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 int smc_lgr_register_conn(struct smc_connection *conn, bool first)
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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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int rc;
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if (!conn->lgr->is_smcd) {
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rc = smcr_lgr_conn_assign_link(conn, first);
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if (rc)
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return rc;
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}
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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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return 0;
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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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sock_put(&smc->sk); /* sock_hold in smc_lgr_register_conn() */
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}
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/* Unregister connection from lgr
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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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if (!lgr)
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return;
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write_lock_bh(&lgr->conns_lock);
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if (conn->alert_token_local) {
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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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conn->lgr = NULL;
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}
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void smc_lgr_cleanup_early(struct smc_connection *conn)
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{
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struct smc_link_group *lgr = conn->lgr;
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struct list_head *lgr_list;
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spinlock_t *lgr_lock;
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if (!lgr)
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return;
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smc_conn_free(conn);
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lgr_list = smc_lgr_list_head(lgr, &lgr_lock);
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spin_lock_bh(lgr_lock);
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/* do not use this link group for new connections */
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if (!list_empty(lgr_list))
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list_del_init(lgr_list);
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spin_unlock_bh(lgr_lock);
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smc_lgr_schedule_free_work_fast(lgr);
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}
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static void smcr_lgr_link_deactivate_all(struct smc_link_group *lgr)
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{
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int i;
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for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
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struct smc_link *lnk = &lgr->lnk[i];
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if (smc_link_usable(lnk))
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lnk->state = SMC_LNK_INACTIVE;
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}
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wake_up_interruptible_all(&lgr->llc_waiter);
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}
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static void smc_lgr_free(struct smc_link_group *lgr);
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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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spinlock_t *lgr_lock;
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bool conns;
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smc_lgr_list_head(lgr, &lgr_lock);
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spin_lock_bh(lgr_lock);
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if (lgr->freeing) {
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spin_unlock_bh(lgr_lock);
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return;
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}
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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(lgr_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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lgr->freeing = 1; /* this instance does the freeing, no new schedule */
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spin_unlock_bh(lgr_lock);
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cancel_delayed_work(&lgr->free_work);
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if (!lgr->is_smcd && !lgr->terminating)
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smc_llc_send_link_delete_all(lgr, true,
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SMC_LLC_DEL_PROG_INIT_TERM);
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if (lgr->is_smcd && !lgr->terminating)
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smc_ism_signal_shutdown(lgr);
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if (!lgr->is_smcd)
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smcr_lgr_link_deactivate_all(lgr);
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smc_lgr_free(lgr);
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}
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static void smc_lgr_terminate_work(struct work_struct *work)
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{
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struct smc_link_group *lgr = container_of(work, struct smc_link_group,
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terminate_work);
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__smc_lgr_terminate(lgr, true);
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}
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/* return next unique link id for the lgr */
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static u8 smcr_next_link_id(struct smc_link_group *lgr)
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{
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u8 link_id;
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int i;
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while (1) {
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link_id = ++lgr->next_link_id;
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if (!link_id) /* skip zero as link_id */
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link_id = ++lgr->next_link_id;
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for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
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if (smc_link_usable(&lgr->lnk[i]) &&
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lgr->lnk[i].link_id == link_id)
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continue;
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}
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break;
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}
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return link_id;
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}
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int smcr_link_init(struct smc_link_group *lgr, struct smc_link *lnk,
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u8 link_idx, struct smc_init_info *ini)
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{
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u8 rndvec[3];
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int rc;
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get_device(&ini->ib_dev->ibdev->dev);
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atomic_inc(&ini->ib_dev->lnk_cnt);
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lnk->state = SMC_LNK_ACTIVATING;
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lnk->link_id = smcr_next_link_id(lgr);
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lnk->lgr = lgr;
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lnk->link_idx = link_idx;
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lnk->smcibdev = ini->ib_dev;
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lnk->ibport = ini->ib_port;
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lnk->path_mtu = ini->ib_dev->pattr[ini->ib_port - 1].active_mtu;
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smc_llc_link_set_uid(lnk);
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INIT_WORK(&lnk->link_down_wrk, smc_link_down_work);
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if (!ini->ib_dev->initialized) {
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rc = (int)smc_ib_setup_per_ibdev(ini->ib_dev);
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if (rc)
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goto out;
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}
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get_random_bytes(rndvec, sizeof(rndvec));
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lnk->psn_initial = rndvec[0] + (rndvec[1] << 8) +
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(rndvec[2] << 16);
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rc = smc_ib_determine_gid(lnk->smcibdev, lnk->ibport,
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ini->vlan_id, lnk->gid, &lnk->sgid_index);
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if (rc)
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goto out;
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rc = smc_llc_link_init(lnk);
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if (rc)
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goto out;
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rc = smc_wr_alloc_link_mem(lnk);
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if (rc)
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goto clear_llc_lnk;
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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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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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clear_llc_lnk:
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smc_llc_link_clear(lnk, false);
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out:
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put_device(&ini->ib_dev->ibdev->dev);
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memset(lnk, 0, sizeof(struct smc_link));
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lnk->state = SMC_LNK_UNUSED;
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if (!atomic_dec_return(&ini->ib_dev->lnk_cnt))
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wake_up(&ini->ib_dev->lnks_deleted);
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return rc;
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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, struct smc_init_info *ini)
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{
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struct smc_link_group *lgr;
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struct list_head *lgr_list;
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struct smc_link *lnk;
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spinlock_t *lgr_lock;
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u8 link_idx;
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int rc = 0;
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int i;
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if (ini->is_smcd && ini->vlan_id) {
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if (smc_ism_get_vlan(ini->ism_dev, ini->vlan_id)) {
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rc = SMC_CLC_DECL_ISMVLANERR;
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goto out;
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}
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}
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lgr = kzalloc(sizeof(*lgr), GFP_KERNEL);
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if (!lgr) {
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rc = SMC_CLC_DECL_MEM;
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goto ism_put_vlan;
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}
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lgr->is_smcd = ini->is_smcd;
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lgr->sync_err = 0;
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lgr->terminating = 0;
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lgr->freefast = 0;
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lgr->freeing = 0;
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lgr->vlan_id = ini->vlan_id;
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mutex_init(&lgr->sndbufs_lock);
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mutex_init(&lgr->rmbs_lock);
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rwlock_init(&lgr->conns_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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lgr->next_link_id = 0;
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smc_lgr_list.num += SMC_LGR_NUM_INCR;
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memcpy(&lgr->id, (u8 *)&smc_lgr_list.num, SMC_LGR_ID_SIZE);
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INIT_DELAYED_WORK(&lgr->free_work, smc_lgr_free_work);
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INIT_WORK(&lgr->terminate_work, smc_lgr_terminate_work);
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lgr->conns_all = RB_ROOT;
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if (ini->is_smcd) {
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/* SMC-D specific settings */
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get_device(&ini->ism_dev->dev);
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lgr->peer_gid = ini->ism_gid;
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lgr->smcd = ini->ism_dev;
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lgr_list = &ini->ism_dev->lgr_list;
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lgr_lock = &lgr->smcd->lgr_lock;
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lgr->peer_shutdown = 0;
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atomic_inc(&ini->ism_dev->lgr_cnt);
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} else {
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/* SMC-R specific settings */
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lgr->role = smc->listen_smc ? SMC_SERV : SMC_CLNT;
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memcpy(lgr->peer_systemid, ini->ib_lcl->id_for_peer,
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SMC_SYSTEMID_LEN);
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memcpy(lgr->pnet_id, ini->ib_dev->pnetid[ini->ib_port - 1],
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SMC_MAX_PNETID_LEN);
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smc_llc_lgr_init(lgr, smc);
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link_idx = SMC_SINGLE_LINK;
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lnk = &lgr->lnk[link_idx];
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rc = smcr_link_init(lgr, lnk, link_idx, ini);
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if (rc)
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goto free_lgr;
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lgr_list = &smc_lgr_list.list;
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lgr_lock = &smc_lgr_list.lock;
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atomic_inc(&lgr_cnt);
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}
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smc->conn.lgr = lgr;
|
|
spin_lock_bh(lgr_lock);
|
|
list_add(&lgr->list, lgr_list);
|
|
spin_unlock_bh(lgr_lock);
|
|
return 0;
|
|
|
|
free_lgr:
|
|
kfree(lgr);
|
|
ism_put_vlan:
|
|
if (ini->is_smcd && ini->vlan_id)
|
|
smc_ism_put_vlan(ini->ism_dev, 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) {
|
|
schedule_delayed_work(&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 (lgr->lnk[i].state != SMC_LNK_ACTIVE ||
|
|
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_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) {
|
|
smcr_link_down_cond_sched(to_lnk);
|
|
return NULL;
|
|
}
|
|
/* 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) {
|
|
smcr_link_down_cond_sched(to_lnk);
|
|
return NULL;
|
|
}
|
|
goto again;
|
|
}
|
|
read_unlock_bh(&lgr->conns_lock);
|
|
return to_lnk;
|
|
}
|
|
|
|
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_tx_dismiss_slots(conn);
|
|
if (current_work() != &conn->abort_work)
|
|
cancel_work_sync(&conn->abort_work);
|
|
}
|
|
if (!list_empty(&lgr->list)) {
|
|
smc_lgr_unregister_conn(conn);
|
|
smc_buf_unuse(conn, lgr); /* allow buffer reuse */
|
|
}
|
|
|
|
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_reset(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);
|
|
if (lgr->is_smcd) {
|
|
if (!lgr->terminating) {
|
|
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_tx_dismiss_slots(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);
|
|
smc_ism_put_vlan(lgr->smcd, lgr->vlan_id);
|
|
put_device(&lgr->smcd->dev);
|
|
} 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);
|
|
|
|
smc_conn_kill(conn, true);
|
|
sock_put(&smc->sk); /* sock_hold done by schedulers of abort_work */
|
|
}
|
|
|
|
/* link is up - establish alternate link if applicable */
|
|
static void smcr_link_up(struct smc_link_group *lgr,
|
|
struct smc_ib_device *smcibdev, u8 ibport)
|
|
{
|
|
struct smc_link *link = NULL;
|
|
|
|
if (list_empty(&lgr->list) ||
|
|
lgr->type == SMC_LGR_SYMMETRIC ||
|
|
lgr->type == SMC_LGR_ASYMMETRIC_PEER)
|
|
return;
|
|
|
|
if (lgr->role == SMC_SERV) {
|
|
/* trigger local add link processing */
|
|
link = smc_llc_usable_link(lgr);
|
|
if (!link)
|
|
return;
|
|
smc_llc_srv_add_link_local(link);
|
|
} else {
|
|
/* invite server to start add link processing */
|
|
u8 gid[SMC_GID_SIZE];
|
|
|
|
if (smc_ib_determine_gid(smcibdev, ibport, lgr->vlan_id, gid,
|
|
NULL))
|
|
return;
|
|
if (lgr->llc_flow_lcl.type != SMC_LLC_FLOW_NONE) {
|
|
/* some other llc task is ongoing */
|
|
wait_event_interruptible_timeout(lgr->llc_waiter,
|
|
(lgr->llc_flow_lcl.type == SMC_LLC_FLOW_NONE),
|
|
SMC_LLC_WAIT_TIME);
|
|
}
|
|
if (list_empty(&lgr->list) ||
|
|
!smc_ib_port_active(smcibdev, ibport))
|
|
return; /* lgr or device no longer active */
|
|
link = smc_llc_usable_link(lgr);
|
|
if (!link)
|
|
return;
|
|
smc_llc_send_add_link(link, smcibdev->mac[ibport - 1], gid,
|
|
NULL, SMC_LLC_REQ);
|
|
}
|
|
}
|
|
|
|
void smcr_port_add(struct smc_ib_device *smcibdev, u8 ibport)
|
|
{
|
|
struct smc_ib_up_work *ib_work;
|
|
struct smc_link_group *lgr, *n;
|
|
|
|
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) ||
|
|
lgr->type == SMC_LGR_SYMMETRIC ||
|
|
lgr->type == SMC_LGR_ASYMMETRIC_PEER)
|
|
continue;
|
|
ib_work = kmalloc(sizeof(*ib_work), GFP_KERNEL);
|
|
if (!ib_work)
|
|
continue;
|
|
INIT_WORK(&ib_work->work, smc_link_up_work);
|
|
ib_work->lgr = lgr;
|
|
ib_work->smcibdev = smcibdev;
|
|
ib_work->ibport = ibport;
|
|
schedule_work(&ib_work->work);
|
|
}
|
|
}
|
|
|
|
/* 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;
|
|
|
|
smc_ib_modify_qp_reset(lnk);
|
|
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_interruptible_timeout(lgr->llc_waiter,
|
|
(lgr->llc_flow_lcl.type == SMC_LLC_FLOW_NONE),
|
|
SMC_LLC_WAIT_TIME);
|
|
mutex_lock(&lgr->llc_conf_mutex);
|
|
}
|
|
smc_llc_send_delete_link(to_lnk, del_link_id, SMC_LLC_REQ, true,
|
|
SMC_LLC_DEL_LOST_PATH);
|
|
}
|
|
}
|
|
|
|
/* 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_up_work(struct work_struct *work)
|
|
{
|
|
struct smc_ib_up_work *ib_work = container_of(work,
|
|
struct smc_ib_up_work,
|
|
work);
|
|
struct smc_link_group *lgr = ib_work->lgr;
|
|
|
|
if (list_empty(&lgr->list))
|
|
goto out;
|
|
smcr_link_up(lgr, ib_work->smcibdev, ib_work->ibport);
|
|
out:
|
|
kfree(ib_work);
|
|
}
|
|
|
|
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_interruptible_all(&lgr->llc_waiter);
|
|
mutex_lock(&lgr->llc_conf_mutex);
|
|
smcr_link_down(link);
|
|
mutex_unlock(&lgr->llc_conf_mutex);
|
|
}
|
|
|
|
/* Determine vlan of internal TCP socket.
|
|
* @vlan_id: address to store the determined vlan id into
|
|
*/
|
|
int smc_vlan_by_tcpsk(struct socket *clcsock, struct smc_init_info *ini)
|
|
{
|
|
struct dst_entry *dst = sk_dst_get(clcsock->sk);
|
|
struct net_device *ndev;
|
|
int i, nest_lvl, 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;
|
|
}
|
|
|
|
rtnl_lock();
|
|
nest_lvl = ndev->lower_level;
|
|
for (i = 0; i < nest_lvl; i++) {
|
|
struct list_head *lower = &ndev->adj_list.lower;
|
|
|
|
if (list_empty(lower))
|
|
break;
|
|
lower = lower->next;
|
|
ndev = (struct net_device *)netdev_lower_get_next(ndev, &lower);
|
|
if (is_vlan_dev(ndev)) {
|
|
ini->vlan_id = vlan_dev_vlan_id(ndev);
|
|
break;
|
|
}
|
|
}
|
|
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 (lgr->lnk[i].state != SMC_LNK_ACTIVE)
|
|
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->lgr_list : &smc_lgr_list.list;
|
|
lgr_lock = ini->is_smcd ? &ini->ism_dev->lgr_lock : &smc_lgr_list.lock;
|
|
ini->cln_first_contact = SMC_FIRST_CONTACT;
|
|
role = smc->listen_smc ? SMC_SERV : SMC_CLNT;
|
|
if (role == SMC_CLNT && ini->srv_first_contact)
|
|
/* 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_gid) :
|
|
smcr_lgr_match(lgr, ini->ib_lcl, role, ini->ib_clcqpn)) &&
|
|
!lgr->sync_err &&
|
|
lgr->vlan_id == ini->vlan_id &&
|
|
(role == SMC_CLNT ||
|
|
lgr->conns_num < SMC_RMBS_PER_LGR_MAX)) {
|
|
/* link group found */
|
|
ini->cln_first_contact = SMC_REUSE_CONTACT;
|
|
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->srv_first_contact &&
|
|
ini->cln_first_contact == SMC_FIRST_CONTACT) {
|
|
/* Server reuses a link group, but Client wants to start
|
|
* a new one
|
|
* send out_of_sync decline, reason synchr. error
|
|
*/
|
|
return SMC_CLC_DECL_SYNCERR;
|
|
}
|
|
|
|
create:
|
|
if (ini->cln_first_contact == SMC_FIRST_CONTACT) {
|
|
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_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 */
|
|
}
|
|
#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 min_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 7 /* 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);
|
|
return ERR_PTR(-EAGAIN);
|
|
}
|
|
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 -ENOMEM;
|
|
|
|
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_usable(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_usable(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_usable(&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_usable(&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)
|
|
smc_buf_free(smc->conn.lgr, false, smc->conn.sndbuf_desc);
|
|
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->rmb_dma_addr,
|
|
clc->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;
|
|
|
|
spin_lock(&smc_ib_devices.lock);
|
|
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);
|
|
}
|
|
spin_unlock(&smc_ib_devices.lock);
|
|
|
|
spin_lock(&smcd_dev_list.lock);
|
|
list_for_each_entry(smcd, &smcd_dev_list.list, list) {
|
|
smcd->going_away = 1;
|
|
}
|
|
spin_unlock(&smcd_dev_list.lock);
|
|
}
|
|
|
|
/* 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);
|
|
|
|
spin_lock(&smcd_dev_list.lock);
|
|
list_for_each_entry(smcd, &smcd_dev_list.list, list)
|
|
smc_smcd_terminate_all(smcd);
|
|
spin_unlock(&smcd_dev_list.lock);
|
|
}
|
|
|
|
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();
|
|
}
|