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Message-Id: <1622805498-26094-1-git-send-email-rahul.lakkireddy@chelsio.com>
Date: Fri, 4 Jun 2021 16:48:18 +0530
From: Rahul Lakkireddy <rahul.lakkireddy@...lsio.com>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net, kuba@...nel.org, rajur@...lsio.com
Subject: [PATCH net] cxgb4: avoid link re-train during TC-MQPRIO configuration
When configuring TC-MQPRIO offload, only turn off netdev carrier and
don't bring physical link down in hardware. Otherwise, when the
physical link is brought up again after configuration, it gets
re-trained and stalls ongoing traffic.
Also, when firmware is no longer accessible or crashed, avoid sending
FLOWC and waiting for reply that will never come.
Fix following hung_task_timeout_secs trace seen in these cases.
INFO: task tc:20807 blocked for more than 122 seconds.
Tainted: G S 5.13.0-rc3+ #122
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:tc state:D stack:14768 pid:20807 ppid: 19366 flags:0x00000000
Call Trace:
__schedule+0x27b/0x6a0
schedule+0x37/0xa0
schedule_preempt_disabled+0x5/0x10
__mutex_lock.isra.14+0x2a0/0x4a0
? netlink_lookup+0x120/0x1a0
? rtnl_fill_ifinfo+0x10f0/0x10f0
__netlink_dump_start+0x70/0x250
rtnetlink_rcv_msg+0x28b/0x380
? rtnl_fill_ifinfo+0x10f0/0x10f0
? rtnl_calcit.isra.42+0x120/0x120
netlink_rcv_skb+0x4b/0xf0
netlink_unicast+0x1a0/0x280
netlink_sendmsg+0x216/0x440
sock_sendmsg+0x56/0x60
__sys_sendto+0xe9/0x150
? handle_mm_fault+0x6d/0x1b0
? do_user_addr_fault+0x1c5/0x620
__x64_sys_sendto+0x1f/0x30
do_syscall_64+0x3c/0x80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f7f73218321
RSP: 002b:00007ffd19626208 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 000055b7c0a8b240 RCX: 00007f7f73218321
RDX: 0000000000000028 RSI: 00007ffd19626210 RDI: 0000000000000003
RBP: 000055b7c08680ff R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000055b7c085f5f6
R13: 000055b7c085f60a R14: 00007ffd19636470 R15: 00007ffd196262a0
Fixes: b1396c2bd675 ("cxgb4: parse and configure TC-MQPRIO offload")
Signed-off-by: Rahul Lakkireddy <rahul.lakkireddy@...lsio.com>
---
drivers/net/ethernet/chelsio/cxgb4/cxgb4.h | 2 --
drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c | 4 ++--
drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_mqprio.c | 9 ++++++---
drivers/net/ethernet/chelsio/cxgb4/sge.c | 6 ++++++
4 files changed, 14 insertions(+), 7 deletions(-)
diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4.h b/drivers/net/ethernet/chelsio/cxgb4/cxgb4.h
index 314f8d806723..9058f09f921e 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4.h
+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4.h
@@ -2177,8 +2177,6 @@ int cxgb4_update_mac_filt(struct port_info *pi, unsigned int viid,
bool persistent, u8 *smt_idx);
int cxgb4_get_msix_idx_from_bmap(struct adapter *adap);
void cxgb4_free_msix_idx_in_bmap(struct adapter *adap, u32 msix_idx);
-int cxgb_open(struct net_device *dev);
-int cxgb_close(struct net_device *dev);
void cxgb4_enable_rx(struct adapter *adap, struct sge_rspq *q);
void cxgb4_quiesce_rx(struct sge_rspq *q);
int cxgb4_port_mirror_alloc(struct net_device *dev);
diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
index 421bd9b88028..1f601de02e70 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
@@ -2834,7 +2834,7 @@ static void cxgb_down(struct adapter *adapter)
/*
* net_device operations
*/
-int cxgb_open(struct net_device *dev)
+static int cxgb_open(struct net_device *dev)
{
struct port_info *pi = netdev_priv(dev);
struct adapter *adapter = pi->adapter;
@@ -2882,7 +2882,7 @@ int cxgb_open(struct net_device *dev)
return err;
}
-int cxgb_close(struct net_device *dev)
+static int cxgb_close(struct net_device *dev)
{
struct port_info *pi = netdev_priv(dev);
struct adapter *adapter = pi->adapter;
diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_mqprio.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_mqprio.c
index 6c259de96f96..338b04f339b3 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_mqprio.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_tc_mqprio.c
@@ -589,7 +589,8 @@ int cxgb4_setup_tc_mqprio(struct net_device *dev,
* down before configuring tc params.
*/
if (netif_running(dev)) {
- cxgb_close(dev);
+ netif_tx_stop_all_queues(dev);
+ netif_carrier_off(dev);
needs_bring_up = true;
}
@@ -615,8 +616,10 @@ int cxgb4_setup_tc_mqprio(struct net_device *dev,
}
out:
- if (needs_bring_up)
- cxgb_open(dev);
+ if (needs_bring_up) {
+ netif_tx_start_all_queues(dev);
+ netif_carrier_on(dev);
+ }
mutex_unlock(&adap->tc_mqprio->mqprio_mutex);
return ret;
diff --git a/drivers/net/ethernet/chelsio/cxgb4/sge.c b/drivers/net/ethernet/chelsio/cxgb4/sge.c
index 1e5f2edb70cf..6a099cb34b12 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/sge.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/sge.c
@@ -2556,6 +2556,12 @@ int cxgb4_ethofld_send_flowc(struct net_device *dev, u32 eotid, u32 tc)
if (!eosw_txq)
return -ENOMEM;
+ if (!(adap->flags & CXGB4_FW_OK)) {
+ /* Don't stall caller when access to FW is lost */
+ complete(&eosw_txq->completion);
+ return -EIO;
+ }
+
skb = alloc_skb(len, GFP_KERNEL);
if (!skb)
return -ENOMEM;
--
2.27.0
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