From: Vadim Lomovtsev <vlomovtsev@marvell.com>
To: "sgoutham@cavium.com" <sgoutham@cavium.com>,
"rric@kernel.org" <rric@kernel.org>,
"davem@davemloft.net" <davem@davemloft.net>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Cc: "dnelson@redhat.com" <dnelson@redhat.com>,
Vadim Lomovtsev <vlomovtsev@marvell.com>
Subject: [PATCH 6/8] net: thunderx: add mutex to protect mailbox from concurrent calls for same VF
Date: Wed, 6 Feb 2019 10:13:57 +0000 [thread overview]
Message-ID: <20190206101351.16744-7-vlomovtsev@marvell.com> (raw)
In-Reply-To: <20190206101351.16744-1-vlomovtsev@marvell.com>
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>
---
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 227343625e83..86cda3f4b37b 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 30c7f54b4f17..a05e2989ec76 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
@@ -2211,6 +2217,7 @@ 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) {
--
2.17.2
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next prev parent reply other threads:[~2019-02-06 10:22 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-06 10:13 [PATCH 0/8] nic: thunderx: fix communication races betwen VF & PF Vadim Lomovtsev
2019-02-06 10:13 ` [PATCH 1/8] net: thunderx: correct typo in macro name Vadim Lomovtsev
2019-02-06 10:13 ` [PATCH 3/8] net: thunderx: make CFG_DONE message to run through generic send-ack sequence Vadim Lomovtsev
2019-02-06 10:13 ` [PATCH 4/8] net: thunderx: add nicvf_send_msg_to_pf result check for set_rx_mode_task Vadim Lomovtsev
2019-02-06 10:13 ` [PATCH 2/8] net: thunderx: replace global nicvf_rx_mode_wq work queue for all VFs to private for each of them Vadim Lomovtsev
2019-02-06 10:13 ` [PATCH 5/8] net: thunderx: rework xcast message structure to make it fit into 64 bit Vadim Lomovtsev
2019-02-06 10:13 ` [PATCH 7/8] net: thunderx: implement helpers to read mailbox IRQ status Vadim Lomovtsev
2019-02-06 10:13 ` Vadim Lomovtsev [this message]
2019-02-06 10:13 ` [PATCH 8/8] net: thunderx: check status of mailbox IRQ before sending a message Vadim Lomovtsev
2019-02-06 14:18 ` [PATCH 0/8] nic: thunderx: fix communication races betwen VF & PF Vadim Lomovtsev
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