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ice: Fix VF Reset paths when interface in a failed over aggregate
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There is an error when an interface has the following conditions:
- PF is in an aggregate (bond)
- PF has VFs created on it
- bond is in a state where it is failed-over to the secondary interface
- A VF reset is issued on one or more of those VFs

The issue is generated by the originating PF trying to rebuild or
reconfigure the VF resources.  Since the bond is failed over to the
secondary interface the queue contexts are in a modified state.

To fix this issue, have the originating interface reclaim its resources
prior to the tear-down and rebuild or reconfigure.  Then after the process
is complete, move the resources back to the currently active interface.

There are multiple paths that can be used depending on what triggered the
event, so create a helper function to move the queues and use paired calls
to the helper (back to origin, process, then move back to active interface)
under the same lag_mutex lock.

Fixes: 1e0f988 ("ice: Flesh out implementation of support for SRIOV on bonded interface")
Signed-off-by: Dave Ertman <[email protected]>
Tested-by: Sujai Buvaneswaran <[email protected]>
Signed-off-by: Tony Nguyen <[email protected]>
Reviewed-by: Przemek Kitszel <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>
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dmertman authored and kuba-moo committed Nov 30, 2023
1 parent 300fbb2 commit 9f74a3d
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Showing 4 changed files with 118 additions and 50 deletions.
122 changes: 72 additions & 50 deletions drivers/net/ethernet/intel/ice/ice_lag.c
Original file line number Diff line number Diff line change
Expand Up @@ -569,6 +569,50 @@ ice_lag_move_vf_node_tc(struct ice_lag *lag, u8 oldport, u8 newport,
dev_dbg(dev, "Problem restarting traffic for LAG node move\n");
}

/**
* ice_lag_build_netdev_list - populate the lag struct's netdev list
* @lag: local lag struct
* @ndlist: pointer to netdev list to populate
*/
static void ice_lag_build_netdev_list(struct ice_lag *lag,
struct ice_lag_netdev_list *ndlist)
{
struct ice_lag_netdev_list *nl;
struct net_device *tmp_nd;

INIT_LIST_HEAD(&ndlist->node);
rcu_read_lock();
for_each_netdev_in_bond_rcu(lag->upper_netdev, tmp_nd) {
nl = kzalloc(sizeof(*nl), GFP_ATOMIC);
if (!nl)
break;

nl->netdev = tmp_nd;
list_add(&nl->node, &ndlist->node);
}
rcu_read_unlock();
lag->netdev_head = &ndlist->node;
}

/**
* ice_lag_destroy_netdev_list - free lag struct's netdev list
* @lag: pointer to local lag struct
* @ndlist: pointer to lag struct netdev list
*/
static void ice_lag_destroy_netdev_list(struct ice_lag *lag,
struct ice_lag_netdev_list *ndlist)
{
struct ice_lag_netdev_list *entry, *n;

rcu_read_lock();
list_for_each_entry_safe(entry, n, &ndlist->node, node) {
list_del(&entry->node);
kfree(entry);
}
rcu_read_unlock();
lag->netdev_head = NULL;
}

/**
* ice_lag_move_single_vf_nodes - Move Tx scheduling nodes for single VF
* @lag: primary interface LAG struct
Expand Down Expand Up @@ -597,7 +641,6 @@ ice_lag_move_single_vf_nodes(struct ice_lag *lag, u8 oldport, u8 newport,
void ice_lag_move_new_vf_nodes(struct ice_vf *vf)
{
struct ice_lag_netdev_list ndlist;
struct list_head *tmp, *n;
u8 pri_port, act_port;
struct ice_lag *lag;
struct ice_vsi *vsi;
Expand All @@ -621,38 +664,15 @@ void ice_lag_move_new_vf_nodes(struct ice_vf *vf)
pri_port = pf->hw.port_info->lport;
act_port = lag->active_port;

if (lag->upper_netdev) {
struct ice_lag_netdev_list *nl;
struct net_device *tmp_nd;

INIT_LIST_HEAD(&ndlist.node);
rcu_read_lock();
for_each_netdev_in_bond_rcu(lag->upper_netdev, tmp_nd) {
nl = kzalloc(sizeof(*nl), GFP_ATOMIC);
if (!nl)
break;

nl->netdev = tmp_nd;
list_add(&nl->node, &ndlist.node);
}
rcu_read_unlock();
}

lag->netdev_head = &ndlist.node;
if (lag->upper_netdev)
ice_lag_build_netdev_list(lag, &ndlist);

if (ice_is_feature_supported(pf, ICE_F_SRIOV_LAG) &&
lag->bonded && lag->primary && pri_port != act_port &&
!list_empty(lag->netdev_head))
ice_lag_move_single_vf_nodes(lag, pri_port, act_port, vsi->idx);

list_for_each_safe(tmp, n, &ndlist.node) {
struct ice_lag_netdev_list *entry;

entry = list_entry(tmp, struct ice_lag_netdev_list, node);
list_del(&entry->node);
kfree(entry);
}
lag->netdev_head = NULL;
ice_lag_destroy_netdev_list(lag, &ndlist);

new_vf_unlock:
mutex_unlock(&pf->lag_mutex);
Expand All @@ -679,6 +699,29 @@ static void ice_lag_move_vf_nodes(struct ice_lag *lag, u8 oldport, u8 newport)
ice_lag_move_single_vf_nodes(lag, oldport, newport, i);
}

/**
* ice_lag_move_vf_nodes_cfg - move vf nodes outside LAG netdev event context
* @lag: local lag struct
* @src_prt: lport value for source port
* @dst_prt: lport value for destination port
*
* This function is used to move nodes during an out-of-netdev-event situation,
* primarily when the driver needs to reconfigure or recreate resources.
*
* Must be called while holding the lag_mutex to avoid lag events from
* processing while out-of-sync moves are happening. Also, paired moves,
* such as used in a reset flow, should both be called under the same mutex
* lock to avoid changes between start of reset and end of reset.
*/
void ice_lag_move_vf_nodes_cfg(struct ice_lag *lag, u8 src_prt, u8 dst_prt)
{
struct ice_lag_netdev_list ndlist;

ice_lag_build_netdev_list(lag, &ndlist);
ice_lag_move_vf_nodes(lag, src_prt, dst_prt);
ice_lag_destroy_netdev_list(lag, &ndlist);
}

#define ICE_LAG_SRIOV_CP_RECIPE 10
#define ICE_LAG_SRIOV_TRAIN_PKT_LEN 16

Expand Down Expand Up @@ -2051,7 +2094,6 @@ void ice_lag_rebuild(struct ice_pf *pf)
{
struct ice_lag_netdev_list ndlist;
struct ice_lag *lag, *prim_lag;
struct list_head *tmp, *n;
u8 act_port, loc_port;

if (!pf->lag || !pf->lag->bonded)
Expand All @@ -2063,21 +2105,7 @@ void ice_lag_rebuild(struct ice_pf *pf)
if (lag->primary) {
prim_lag = lag;
} else {
struct ice_lag_netdev_list *nl;
struct net_device *tmp_nd;

INIT_LIST_HEAD(&ndlist.node);
rcu_read_lock();
for_each_netdev_in_bond_rcu(lag->upper_netdev, tmp_nd) {
nl = kzalloc(sizeof(*nl), GFP_ATOMIC);
if (!nl)
break;

nl->netdev = tmp_nd;
list_add(&nl->node, &ndlist.node);
}
rcu_read_unlock();
lag->netdev_head = &ndlist.node;
ice_lag_build_netdev_list(lag, &ndlist);
prim_lag = ice_lag_find_primary(lag);
}

Expand Down Expand Up @@ -2107,13 +2135,7 @@ void ice_lag_rebuild(struct ice_pf *pf)

ice_clear_rdma_cap(pf);
lag_rebuild_out:
list_for_each_safe(tmp, n, &ndlist.node) {
struct ice_lag_netdev_list *entry;

entry = list_entry(tmp, struct ice_lag_netdev_list, node);
list_del(&entry->node);
kfree(entry);
}
ice_lag_destroy_netdev_list(lag, &ndlist);
mutex_unlock(&pf->lag_mutex);
}

Expand Down
1 change: 1 addition & 0 deletions drivers/net/ethernet/intel/ice/ice_lag.h
Original file line number Diff line number Diff line change
Expand Up @@ -65,4 +65,5 @@ int ice_init_lag(struct ice_pf *pf);
void ice_deinit_lag(struct ice_pf *pf);
void ice_lag_rebuild(struct ice_pf *pf);
bool ice_lag_is_switchdev_running(struct ice_pf *pf);
void ice_lag_move_vf_nodes_cfg(struct ice_lag *lag, u8 src_prt, u8 dst_prt);
#endif /* _ICE_LAG_H_ */
20 changes: 20 additions & 0 deletions drivers/net/ethernet/intel/ice/ice_vf_lib.c
Original file line number Diff line number Diff line change
Expand Up @@ -829,12 +829,16 @@ static void ice_notify_vf_reset(struct ice_vf *vf)
int ice_reset_vf(struct ice_vf *vf, u32 flags)
{
struct ice_pf *pf = vf->pf;
struct ice_lag *lag;
struct ice_vsi *vsi;
u8 act_prt, pri_prt;
struct device *dev;
int err = 0;
bool rsd;

dev = ice_pf_to_dev(pf);
act_prt = ICE_LAG_INVALID_PORT;
pri_prt = pf->hw.port_info->lport;

if (flags & ICE_VF_RESET_NOTIFY)
ice_notify_vf_reset(vf);
Expand All @@ -845,6 +849,17 @@ int ice_reset_vf(struct ice_vf *vf, u32 flags)
return 0;
}

lag = pf->lag;
mutex_lock(&pf->lag_mutex);
if (lag && lag->bonded && lag->primary) {
act_prt = lag->active_port;
if (act_prt != pri_prt && act_prt != ICE_LAG_INVALID_PORT &&
lag->upper_netdev)
ice_lag_move_vf_nodes_cfg(lag, act_prt, pri_prt);
else
act_prt = ICE_LAG_INVALID_PORT;
}

if (flags & ICE_VF_RESET_LOCK)
mutex_lock(&vf->cfg_lock);
else
Expand Down Expand Up @@ -937,6 +952,11 @@ int ice_reset_vf(struct ice_vf *vf, u32 flags)
if (flags & ICE_VF_RESET_LOCK)
mutex_unlock(&vf->cfg_lock);

if (lag && lag->bonded && lag->primary &&
act_prt != ICE_LAG_INVALID_PORT)
ice_lag_move_vf_nodes_cfg(lag, pri_prt, act_prt);
mutex_unlock(&pf->lag_mutex);

return err;
}

Expand Down
25 changes: 25 additions & 0 deletions drivers/net/ethernet/intel/ice/ice_virtchnl.c
Original file line number Diff line number Diff line change
Expand Up @@ -1603,9 +1603,24 @@ static int ice_vc_cfg_qs_msg(struct ice_vf *vf, u8 *msg)
(struct virtchnl_vsi_queue_config_info *)msg;
struct virtchnl_queue_pair_info *qpi;
struct ice_pf *pf = vf->pf;
struct ice_lag *lag;
struct ice_vsi *vsi;
u8 act_prt, pri_prt;
int i = -1, q_idx;

lag = pf->lag;
mutex_lock(&pf->lag_mutex);
act_prt = ICE_LAG_INVALID_PORT;
pri_prt = pf->hw.port_info->lport;
if (lag && lag->bonded && lag->primary) {
act_prt = lag->active_port;
if (act_prt != pri_prt && act_prt != ICE_LAG_INVALID_PORT &&
lag->upper_netdev)
ice_lag_move_vf_nodes_cfg(lag, act_prt, pri_prt);
else
act_prt = ICE_LAG_INVALID_PORT;
}

if (!test_bit(ICE_VF_STATE_ACTIVE, vf->vf_states))
goto error_param;

Expand Down Expand Up @@ -1729,6 +1744,11 @@ static int ice_vc_cfg_qs_msg(struct ice_vf *vf, u8 *msg)
}
}

if (lag && lag->bonded && lag->primary &&
act_prt != ICE_LAG_INVALID_PORT)
ice_lag_move_vf_nodes_cfg(lag, pri_prt, act_prt);
mutex_unlock(&pf->lag_mutex);

/* send the response to the VF */
return ice_vc_send_msg_to_vf(vf, VIRTCHNL_OP_CONFIG_VSI_QUEUES,
VIRTCHNL_STATUS_SUCCESS, NULL, 0);
Expand All @@ -1743,6 +1763,11 @@ static int ice_vc_cfg_qs_msg(struct ice_vf *vf, u8 *msg)
vf->vf_id, i);
}

if (lag && lag->bonded && lag->primary &&
act_prt != ICE_LAG_INVALID_PORT)
ice_lag_move_vf_nodes_cfg(lag, pri_prt, act_prt);
mutex_unlock(&pf->lag_mutex);

ice_lag_move_new_vf_nodes(vf);

/* send the response to the VF */
Expand Down

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