From: Stefan Raspl <raspl@linux.ibm.com>
Subject: net/smc: do not reuse a linkgroup with setup problems
Patch-mainline: v4.16-rc1
Git-commit: 610db66f377cf99aa07a2b1990727238f2e2d6d3
References: FATE#325694, LTC#167874, bsc#1113480
Summary: net/smc: SMC-R MVP
Description: Add latest upstream patches to push SMC-R to the MVP level
Upstream-Description:
net/smc: do not reuse a linkgroup with setup problems
Once a linkgroup is created successfully, it stays alive for a
certain time to service more connections potentially created.
If one of the initialization steps for a new linkgroup fails,
the linkgroup should not be reused by other connections following.
Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Stefan Raspl <raspl@linux.ibm.com>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
net/smc/af_smc.c | 17 +++++++++++++++++
net/smc/smc_core.c | 3 +++
2 files changed, 20 insertions(+)
--- a/net/smc/af_smc.c
+++ b/net/smc/af_smc.c
@@ -377,6 +377,15 @@ static void smc_link_save_peer_info(stru
link->peer_mtu = clc->qp_mtu;
}
+static void smc_lgr_forget(struct smc_link_group *lgr)
+{
+ spin_lock_bh(&smc_lgr_list.lock);
+ /* do not use this link group for new connections */
+ if (!list_empty(&lgr->list))
+ list_del_init(&lgr->list);
+ spin_unlock_bh(&smc_lgr_list.lock);
+}
+
/* setup for RDMA connection of client */
static int smc_connect_rdma(struct smc_sock *smc)
{
@@ -513,6 +522,8 @@ out_connected:
return rc ? rc : local_contact;
decline_rdma_unlock:
+ if (local_contact == SMC_FIRST_CONTACT)
+ smc_lgr_forget(smc->conn.lgr);
mutex_unlock(&smc_create_lgr_pending);
smc_conn_free(&smc->conn);
decline_rdma:
@@ -526,6 +537,8 @@ decline_rdma:
goto out_connected;
out_err_unlock:
+ if (local_contact == SMC_FIRST_CONTACT)
+ smc_lgr_forget(smc->conn.lgr);
mutex_unlock(&smc_create_lgr_pending);
smc_conn_free(&smc->conn);
out_err:
@@ -906,6 +919,8 @@ enqueue:
return;
decline_rdma_unlock:
+ if (local_contact == SMC_FIRST_CONTACT)
+ smc_lgr_forget(new_smc->conn.lgr);
mutex_unlock(&smc_create_lgr_pending);
decline_rdma:
/* RDMA setup failed, switch back to TCP */
@@ -918,6 +933,8 @@ decline_rdma:
goto out_connected;
out_err_unlock:
+ if (local_contact == SMC_FIRST_CONTACT)
+ smc_lgr_forget(new_smc->conn.lgr);
mutex_unlock(&smc_create_lgr_pending);
out_err:
newsmcsk->sk_state = SMC_CLOSED;
--- a/net/smc/smc_core.c
+++ b/net/smc/smc_core.c
@@ -127,6 +127,8 @@ static void smc_lgr_free_work(struct wor
bool conns;
spin_lock_bh(&smc_lgr_list.lock);
+ if (list_empty(&lgr->list))
+ goto free;
read_lock_bh(&lgr->conns_lock);
conns = RB_EMPTY_ROOT(&lgr->conns_all);
read_unlock_bh(&lgr->conns_lock);
@@ -135,6 +137,7 @@ static void smc_lgr_free_work(struct wor
return;
}
list_del_init(&lgr->list); /* remove from smc_lgr_list */
+free:
spin_unlock_bh(&smc_lgr_list.lock);
smc_lgr_free(lgr);
}