From 609ea65c65a0f801c285abf524d36d1f4635d942 Mon Sep 17 00:00:00 2001
From: Vadim Lomovtsev <vlomovtsev@marvell.com>
Date: Wed, 20 Feb 2019 11:02:44 +0000
Subject: [PATCH] net: thunderx: add mutex to protect mailbox from concurrent
calls for same VF
In some cases it could happen that nicvf_send_msg_to_pf() could be called
concurrently for the same NIC VF, and thus re-writing mailbox contents and
breaking messaging sequence with PF by re-writing NICVF data.
This commit is to implement mutex for NICVF to protect mailbox registers
and NICVF messaging control data from concurrent access.
Signed-off-by: Vadim Lomovtsev <vlomovtsev@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
drivers/net/ethernet/cavium/thunder/nic.h | 2 ++
drivers/net/ethernet/cavium/thunder/nicvf_main.c | 13 ++++++++++---
2 files changed, 12 insertions(+), 3 deletions(-)
diff --git a/drivers/net/ethernet/cavium/thunder/nic.h b/drivers/net/ethernet/cavium/thunder/nic.h
index 227343625e838..86cda3f4b37bc 100644
--- a/drivers/net/ethernet/cavium/thunder/nic.h
+++ b/drivers/net/ethernet/cavium/thunder/nic.h
@@ -329,6 +329,8 @@ struct nicvf {
spinlock_t rx_mode_wq_lock;
/* workqueue for handling kernel ndo_set_rx_mode() calls */
struct workqueue_struct *nicvf_rx_mode_wq;
+ /* mutex to protect VF's mailbox contents from concurrent access */
+ struct mutex rx_mode_mtx;
/* PTP timestamp */
struct cavium_ptp *ptp_clock;
diff --git a/drivers/net/ethernet/cavium/thunder/nicvf_main.c b/drivers/net/ethernet/cavium/thunder/nicvf_main.c
index da5986ca7beed..2332e3e95e0e1 100644
--- a/drivers/net/ethernet/cavium/thunder/nicvf_main.c
+++ b/drivers/net/ethernet/cavium/thunder/nicvf_main.c
@@ -124,6 +124,9 @@ int nicvf_send_msg_to_pf(struct nicvf *nic, union nic_mbx *mbx)
{
int timeout = NIC_MBOX_MSG_TIMEOUT;
int sleep = 10;
+ int ret = 0;
+
+ mutex_lock(&nic->rx_mode_mtx);
nic->pf_acked = false;
nic->pf_nacked = false;
@@ -136,7 +139,8 @@ int nicvf_send_msg_to_pf(struct nicvf *nic, union nic_mbx *mbx)
netdev_err(nic->netdev,
"PF NACK to mbox msg 0x%02x from VF%d\n",
(mbx->msg.msg & 0xFF), nic->vf_id);
- return -EINVAL;
+ ret = -EINVAL;
+ break;
}
msleep(sleep);
if (nic->pf_acked)
@@ -146,10 +150,12 @@ int nicvf_send_msg_to_pf(struct nicvf *nic, union nic_mbx *mbx)
netdev_err(nic->netdev,
"PF didn't ACK to mbox msg 0x%02x from VF%d\n",
(mbx->msg.msg & 0xFF), nic->vf_id);
- return -EBUSY;
+ ret = -EBUSY;
+ break;
}
}
- return 0;
+ mutex_unlock(&nic->rx_mode_mtx);
+ return ret;
}
/* Checks if VF is able to comminicate with PF
@@ -2208,6 +2214,7 @@ static int nicvf_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
nic->vf_id);
INIT_WORK(&nic->rx_mode_work.work, nicvf_set_rx_mode_task);
spin_lock_init(&nic->rx_mode_wq_lock);
+ mutex_init(&nic->rx_mode_mtx);
err = register_netdev(netdev);
if (err) {
--
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