diff options
| author | Vadim Lomovtsev <vlomovtsev@marvell.com> | 2019-02-20 11:02:44 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-02-22 11:43:45 -0800 |
| commit | 609ea65c65a0f801c285abf524d36d1f4635d942 (patch) | |
| tree | 442d6d2cd438caea558fb11abdb9839f83457b9c /drivers/net/ethernet/cavium | |
| parent | 5354439612894033e3f3b934f0bc03afb5f4ddc5 (diff) | |
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>
Diffstat (limited to 'drivers/net/ethernet/cavium')
| -rw-r--r-- | drivers/net/ethernet/cavium/thunder/nic.h | 2 | ||||
| -rw-r--r-- | 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 da5986ca7bee..2332e3e95e0e 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) { |