From 2a0674fffb6bc1a7c0f46bb2e0b1bcf1d49c2232 Mon Sep 17 00:00:00 2001 From: Ursula Braun Date: Mon, 21 Oct 2019 16:13:13 +0200 Subject: [PATCH] net/smc: improve abnormal termination of link groups If a link group and its connections must be terminated, * wake up socket waiters * do not enable buffer reuse A linkgroup might be terminated while normal connection closing is running. Avoid buffer reuse and its related LLC DELETE RKEY call, if linkgroup termination has started. And use the earliest indication of linkgroup termination possible, namely the removal from the linkgroup list. Signed-off-by: Ursula Braun Signed-off-by: Karsten Graul Signed-off-by: Jakub Kicinski --- net/smc/smc_core.c | 40 +++++++++++++++++++++++++++++----------- 1 file changed, 29 insertions(+), 11 deletions(-) diff --git a/net/smc/smc_core.c b/net/smc/smc_core.c index 494288f32df6..6faaa38412b1 100644 --- a/net/smc/smc_core.c +++ b/net/smc/smc_core.c @@ -154,6 +154,7 @@ static void smc_lgr_unregister_conn(struct smc_connection *conn) __smc_lgr_unregister_conn(conn); } write_unlock_bh(&lgr->conns_lock); + conn->lgr = NULL; } /* Send delete link, either as client to request the initiation @@ -344,7 +345,7 @@ static void smc_buf_unuse(struct smc_connection *conn, conn->sndbuf_desc->used = 0; if (conn->rmb_desc) { if (!conn->rmb_desc->regerr) { - if (!lgr->is_smcd) { + if (!lgr->is_smcd && !list_empty(&lgr->list)) { /* unregister rmb with peer */ smc_llc_do_delete_rkey( &lgr->lnk[SMC_SINGLE_LINK], @@ -375,9 +376,10 @@ void smc_conn_free(struct smc_connection *conn) } else { smc_cdc_tx_dismiss_slots(conn); } - smc_lgr_unregister_conn(conn); - smc_buf_unuse(conn, lgr); /* allow buffer reuse */ - conn->lgr = NULL; + 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); @@ -491,6 +493,28 @@ void smc_lgr_forget(struct smc_link_group *lgr) spin_unlock_bh(lgr_lock); } +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) +{ + struct smc_sock *smc = container_of(conn, struct smc_sock, conn); + + smc_close_abort(conn); + conn->killed = 1; + smc_sk_wake_ups(smc); + smc_lgr_unregister_conn(conn); + smc->sk.sk_err = ECONNABORTED; + sock_hold(&smc->sk); /* sock_put in close work */ + if (!schedule_work(&conn->close_work)) + sock_put(&smc->sk); +} + /* terminate link group */ static void __smc_lgr_terminate(struct smc_link_group *lgr) { @@ -512,13 +536,7 @@ static void __smc_lgr_terminate(struct smc_link_group *lgr) conn = rb_entry(node, struct smc_connection, alert_node); smc = container_of(conn, struct smc_sock, conn); lock_sock(&smc->sk); - sock_hold(&smc->sk); /* sock_put in close work */ - smc_close_abort(conn); - conn->killed = 1; - smc_lgr_unregister_conn(conn); - conn->lgr = NULL; - if (!schedule_work(&conn->close_work)) - sock_put(&smc->sk); + smc_conn_kill(conn); release_sock(&smc->sk); read_lock_bh(&lgr->conns_lock); node = rb_first(&lgr->conns_all);