From e2dc9b6e38fa3919e63d6d7905da70ca41cbf908 Mon Sep 17 00:00:00 2001 From: Michael Chan Date: Fri, 13 Oct 2017 21:09:30 -0400 Subject: bnxt_en: Don't use rtnl lock to protect link change logic in workqueue. As a further improvement to the PF/VF link change logic, use a private mutex instead of the rtnl lock to protect link change logic. With the new mutex, we don't have to take the rtnl lock in the workqueue when we have to handle link related functions. If the VF and PF drivers are running on the same host and both take the rtnl lock and one is waiting for the other, it will cause timeout. This patch fixes these timeouts. Fixes: 90c694bb7181 ("bnxt_en: Fix RTNL lock usage on bnxt_update_link().") Signed-off-by: Michael Chan Signed-off-by: David S. Miller --- drivers/net/ethernet/broadcom/bnxt/bnxt.c | 25 ++++++++++++----------- drivers/net/ethernet/broadcom/bnxt/bnxt.h | 4 ++++ drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c | 4 ++++ 3 files changed, 21 insertions(+), 12 deletions(-) (limited to 'drivers/net/ethernet') diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c index 7906153c5c05..3f596de2abe3 100644 --- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c @@ -6345,7 +6345,9 @@ static int __bnxt_open_nic(struct bnxt *bp, bool irq_re_init, bool link_re_init) } if (link_re_init) { + mutex_lock(&bp->link_lock); rc = bnxt_update_phy_setting(bp); + mutex_unlock(&bp->link_lock); if (rc) netdev_warn(bp->dev, "failed to update phy settings\n"); } @@ -7043,30 +7045,28 @@ static void bnxt_sp_task(struct work_struct *work) if (test_and_clear_bit(BNXT_PERIODIC_STATS_SP_EVENT, &bp->sp_event)) bnxt_hwrm_port_qstats(bp); - /* These functions below will clear BNXT_STATE_IN_SP_TASK. They - * must be the last functions to be called before exiting. - */ if (test_and_clear_bit(BNXT_LINK_CHNG_SP_EVENT, &bp->sp_event)) { - int rc = 0; + int rc; + mutex_lock(&bp->link_lock); if (test_and_clear_bit(BNXT_LINK_SPEED_CHNG_SP_EVENT, &bp->sp_event)) bnxt_hwrm_phy_qcaps(bp); - bnxt_rtnl_lock_sp(bp); - if (test_bit(BNXT_STATE_OPEN, &bp->state)) - rc = bnxt_update_link(bp, true); - bnxt_rtnl_unlock_sp(bp); + rc = bnxt_update_link(bp, true); + mutex_unlock(&bp->link_lock); if (rc) netdev_err(bp->dev, "SP task can't update link (rc: %x)\n", rc); } if (test_and_clear_bit(BNXT_HWRM_PORT_MODULE_SP_EVENT, &bp->sp_event)) { - bnxt_rtnl_lock_sp(bp); - if (test_bit(BNXT_STATE_OPEN, &bp->state)) - bnxt_get_port_module_status(bp); - bnxt_rtnl_unlock_sp(bp); + mutex_lock(&bp->link_lock); + bnxt_get_port_module_status(bp); + mutex_unlock(&bp->link_lock); } + /* These functions below will clear BNXT_STATE_IN_SP_TASK. They + * must be the last functions to be called before exiting. + */ if (test_and_clear_bit(BNXT_RESET_TASK_SP_EVENT, &bp->sp_event)) bnxt_reset(bp, false); @@ -7766,6 +7766,7 @@ static int bnxt_probe_phy(struct bnxt *bp) rc); return rc; } + mutex_init(&bp->link_lock); rc = bnxt_update_link(bp, false); if (rc) { diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.h b/drivers/net/ethernet/broadcom/bnxt/bnxt.h index 7b888d4b2b55..d2925c04709a 100644 --- a/drivers/net/ethernet/broadcom/bnxt/bnxt.h +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.h @@ -1290,6 +1290,10 @@ struct bnxt { unsigned long *ntp_fltr_bmap; int ntp_fltr_count; + /* To protect link related settings during link changes and + * ethtool settings changes. + */ + struct mutex link_lock; struct bnxt_link_info link_info; struct ethtool_eee eee; u32 lpi_tmr_lo; diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c index 8eff05a3e0e4..b2cbc970b497 100644 --- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c @@ -1052,6 +1052,7 @@ static int bnxt_get_link_ksettings(struct net_device *dev, u32 ethtool_speed; ethtool_link_ksettings_zero_link_mode(lk_ksettings, supported); + mutex_lock(&bp->link_lock); bnxt_fw_to_ethtool_support_spds(link_info, lk_ksettings); ethtool_link_ksettings_zero_link_mode(lk_ksettings, advertising); @@ -1099,6 +1100,7 @@ static int bnxt_get_link_ksettings(struct net_device *dev, base->port = PORT_FIBRE; } base->phy_address = link_info->phy_addr; + mutex_unlock(&bp->link_lock); return 0; } @@ -1190,6 +1192,7 @@ static int bnxt_set_link_ksettings(struct net_device *dev, if (!BNXT_SINGLE_PF(bp)) return -EOPNOTSUPP; + mutex_lock(&bp->link_lock); if (base->autoneg == AUTONEG_ENABLE) { BNXT_ETHTOOL_TO_FW_SPDS(fw_advertising, lk_ksettings, advertising); @@ -1234,6 +1237,7 @@ static int bnxt_set_link_ksettings(struct net_device *dev, rc = bnxt_hwrm_set_link_setting(bp, set_pause, false); set_setting_exit: + mutex_unlock(&bp->link_lock); return rc; } -- cgit v1.2.3