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net/mlx5e: Implement mlx5e interface attach/detach callbacks
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Needed to support seamless and lightweight PCI/Internal error recovery.
Implement the attach/detach interface callbacks.
In attach callback we only allocate HW resources.
In detach callback we only deallocate HW resources.
All SW/kernel objects initialzing/destroying is kept in add/remove
callbacks.

Signed-off-by: Mohamad Haj Yahia <mohamad@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Mohamad Haj Yahia authored and davem330 committed Sep 11, 2016
1 parent 1ab2068 commit 26e59d8
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Showing 3 changed files with 183 additions and 63 deletions.
7 changes: 5 additions & 2 deletions drivers/net/ethernet/mellanox/mlx5/core/en.h
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Original file line number Diff line number Diff line change
Expand Up @@ -844,9 +844,12 @@ void mlx5e_cleanup_nic_tx(struct mlx5e_priv *priv);
int mlx5e_close(struct net_device *netdev);
int mlx5e_open(struct net_device *netdev);
void mlx5e_update_stats_work(struct work_struct *work);
void *mlx5e_create_netdev(struct mlx5_core_dev *mdev,
const struct mlx5e_profile *profile, void *ppriv);
struct net_device *mlx5e_create_netdev(struct mlx5_core_dev *mdev,
const struct mlx5e_profile *profile,
void *ppriv);
void mlx5e_destroy_netdev(struct mlx5_core_dev *mdev, struct mlx5e_priv *priv);
int mlx5e_attach_netdev(struct mlx5_core_dev *mdev, struct net_device *netdev);
void mlx5e_detach_netdev(struct mlx5_core_dev *mdev, struct net_device *netdev);
struct rtnl_link_stats64 *
mlx5e_get_stats(struct net_device *dev, struct rtnl_link_stats64 *stats);

Expand Down
200 changes: 143 additions & 57 deletions drivers/net/ethernet/mellanox/mlx5/core/en_main.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -1883,6 +1883,9 @@ int mlx5e_close(struct net_device *netdev)
struct mlx5e_priv *priv = netdev_priv(netdev);
int err;

if (!netif_device_present(netdev))
return -ENODEV;

mutex_lock(&priv->state_lock);
err = mlx5e_close_locked(netdev);
mutex_unlock(&priv->state_lock);
Expand Down Expand Up @@ -3401,13 +3404,13 @@ static const struct mlx5e_profile mlx5e_nic_profile = {
.max_tc = MLX5E_MAX_NUM_TC,
};

void *mlx5e_create_netdev(struct mlx5_core_dev *mdev,
const struct mlx5e_profile *profile, void *ppriv)
struct net_device *mlx5e_create_netdev(struct mlx5_core_dev *mdev,
const struct mlx5e_profile *profile,
void *ppriv)
{
int nch = profile->max_nch(mdev);
struct net_device *netdev;
struct mlx5e_priv *priv;
int nch = profile->max_nch(mdev);
int err;

netdev = alloc_etherdev_mqs(sizeof(struct mlx5e_priv),
nch * profile->max_tc,
Expand All @@ -3425,12 +3428,31 @@ void *mlx5e_create_netdev(struct mlx5_core_dev *mdev,

priv->wq = create_singlethread_workqueue("mlx5e");
if (!priv->wq)
goto err_free_netdev;
goto err_cleanup_nic;

return netdev;

err_cleanup_nic:
profile->cleanup(priv);
free_netdev(netdev);

return NULL;
}

int mlx5e_attach_netdev(struct mlx5_core_dev *mdev, struct net_device *netdev)
{
const struct mlx5e_profile *profile;
struct mlx5e_priv *priv;
int err;

priv = netdev_priv(netdev);
profile = priv->profile;
clear_bit(MLX5E_STATE_DESTROYING, &priv->state);

err = mlx5e_create_umr_mkey(priv);
if (err) {
mlx5_core_err(mdev, "create umr mkey failed, %d\n", err);
goto err_destroy_wq;
goto out;
}

err = profile->init_tx(priv);
Expand All @@ -3453,20 +3475,16 @@ void *mlx5e_create_netdev(struct mlx5_core_dev *mdev,

mlx5e_set_dev_port_mtu(netdev);

err = register_netdev(netdev);
if (err) {
mlx5_core_err(mdev, "register_netdev failed, %d\n", err);
goto err_dealloc_q_counters;
}

if (profile->enable)
profile->enable(priv);

return priv;
rtnl_lock();
if (netif_running(netdev))
mlx5e_open(netdev);
netif_device_attach(netdev);
rtnl_unlock();

err_dealloc_q_counters:
mlx5e_destroy_q_counter(priv);
profile->cleanup_rx(priv);
return 0;

err_close_drop_rq:
mlx5e_close_drop_rq(priv);
Expand All @@ -3477,13 +3495,8 @@ void *mlx5e_create_netdev(struct mlx5_core_dev *mdev,
err_destroy_umr_mkey:
mlx5_core_destroy_mkey(mdev, &priv->umr_mkey);

err_destroy_wq:
destroy_workqueue(priv->wq);

err_free_netdev:
free_netdev(netdev);

return NULL;
out:
return err;
}

static void mlx5e_register_vport_rep(struct mlx5_core_dev *mdev)
Expand All @@ -3509,60 +3522,132 @@ static void mlx5e_register_vport_rep(struct mlx5_core_dev *mdev)
}
}

void mlx5e_detach_netdev(struct mlx5_core_dev *mdev, struct net_device *netdev)
{
struct mlx5e_priv *priv = netdev_priv(netdev);
const struct mlx5e_profile *profile = priv->profile;

set_bit(MLX5E_STATE_DESTROYING, &priv->state);
if (profile->disable)
profile->disable(priv);

flush_workqueue(priv->wq);

rtnl_lock();
if (netif_running(netdev))
mlx5e_close(netdev);
netif_device_detach(netdev);
rtnl_unlock();

mlx5e_destroy_q_counter(priv);
profile->cleanup_rx(priv);
mlx5e_close_drop_rq(priv);
profile->cleanup_tx(priv);
mlx5_core_destroy_mkey(priv->mdev, &priv->umr_mkey);
cancel_delayed_work_sync(&priv->update_stats_work);
}

/* mlx5e_attach and mlx5e_detach scope should be only creating/destroying
* hardware contexts and to connect it to the current netdev.
*/
static int mlx5e_attach(struct mlx5_core_dev *mdev, void *vpriv)
{
struct mlx5e_priv *priv = vpriv;
struct net_device *netdev = priv->netdev;
int err;

if (netif_device_present(netdev))
return 0;

err = mlx5e_create_mdev_resources(mdev);
if (err)
return err;

err = mlx5e_attach_netdev(mdev, netdev);
if (err) {
mlx5e_destroy_mdev_resources(mdev);
return err;
}

return 0;
}

static void mlx5e_detach(struct mlx5_core_dev *mdev, void *vpriv)
{
struct mlx5e_priv *priv = vpriv;
struct net_device *netdev = priv->netdev;

if (!netif_device_present(netdev))
return;

mlx5e_detach_netdev(mdev, netdev);
mlx5e_destroy_mdev_resources(mdev);
}

static void *mlx5e_add(struct mlx5_core_dev *mdev)
{
struct mlx5_eswitch *esw = mdev->priv.eswitch;
int total_vfs = MLX5_TOTAL_VPORTS(mdev);
void *ppriv = NULL;
void *ret;

if (mlx5e_check_required_hca_cap(mdev))
return NULL;
void *priv;
int vport;
int err;
struct net_device *netdev;

if (mlx5e_create_mdev_resources(mdev))
err = mlx5e_check_required_hca_cap(mdev);
if (err)
return NULL;

mlx5e_register_vport_rep(mdev);

if (MLX5_CAP_GEN(mdev, vport_group_manager))
ppriv = &esw->offloads.vport_reps[0];

ret = mlx5e_create_netdev(mdev, &mlx5e_nic_profile, ppriv);
if (!ret) {
mlx5e_destroy_mdev_resources(mdev);
return NULL;
netdev = mlx5e_create_netdev(mdev, &mlx5e_nic_profile, ppriv);
if (!netdev) {
mlx5_core_err(mdev, "mlx5e_create_netdev failed\n");
goto err_unregister_reps;
}

priv = netdev_priv(netdev);

err = mlx5e_attach(mdev, priv);
if (err) {
mlx5_core_err(mdev, "mlx5e_attach failed, %d\n", err);
goto err_destroy_netdev;
}

err = register_netdev(netdev);
if (err) {
mlx5_core_err(mdev, "register_netdev failed, %d\n", err);
goto err_detach;
}
return ret;

return priv;

err_detach:
mlx5e_detach(mdev, priv);

err_destroy_netdev:
mlx5e_destroy_netdev(mdev, priv);

err_unregister_reps:
for (vport = 1; vport < total_vfs; vport++)
mlx5_eswitch_unregister_vport_rep(esw, vport);

return NULL;
}

void mlx5e_destroy_netdev(struct mlx5_core_dev *mdev, struct mlx5e_priv *priv)
{
const struct mlx5e_profile *profile = priv->profile;
struct net_device *netdev = priv->netdev;

set_bit(MLX5E_STATE_DESTROYING, &priv->state);
if (profile->disable)
profile->disable(priv);

flush_workqueue(priv->wq);
if (test_bit(MLX5_INTERFACE_STATE_SHUTDOWN, &mdev->intf_state)) {
netif_device_detach(netdev);
mlx5e_close(netdev);
} else {
unregister_netdev(netdev);
}

mlx5e_destroy_q_counter(priv);
profile->cleanup_rx(priv);
mlx5e_close_drop_rq(priv);
profile->cleanup_tx(priv);
mlx5_core_destroy_mkey(priv->mdev, &priv->umr_mkey);
cancel_delayed_work_sync(&priv->update_stats_work);
unregister_netdev(netdev);
destroy_workqueue(priv->wq);
if (profile->cleanup)
profile->cleanup(priv);

if (!test_bit(MLX5_INTERFACE_STATE_SHUTDOWN, &mdev->intf_state))
free_netdev(netdev);
free_netdev(netdev);
}

static void mlx5e_remove(struct mlx5_core_dev *mdev, void *vpriv)
Expand All @@ -3572,12 +3657,11 @@ static void mlx5e_remove(struct mlx5_core_dev *mdev, void *vpriv)
struct mlx5e_priv *priv = vpriv;
int vport;

mlx5e_destroy_netdev(mdev, priv);

for (vport = 1; vport < total_vfs; vport++)
mlx5_eswitch_unregister_vport_rep(esw, vport);

mlx5e_destroy_mdev_resources(mdev);
mlx5e_detach(mdev, vpriv);
mlx5e_destroy_netdev(mdev, priv);
}

static void *mlx5e_get_netdev(void *vpriv)
Expand All @@ -3590,6 +3674,8 @@ static void *mlx5e_get_netdev(void *vpriv)
static struct mlx5_interface mlx5e_interface = {
.add = mlx5e_add,
.remove = mlx5e_remove,
.attach = mlx5e_attach,
.detach = mlx5e_detach,
.event = mlx5e_async_event,
.protocol = MLX5_INTERFACE_PROTOCOL_ETH,
.get_dev = mlx5e_get_netdev,
Expand Down
39 changes: 35 additions & 4 deletions drivers/net/ethernet/mellanox/mlx5/core/en_rep.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -413,19 +413,50 @@ static struct mlx5e_profile mlx5e_rep_profile = {
int mlx5e_vport_rep_load(struct mlx5_eswitch *esw,
struct mlx5_eswitch_rep *rep)
{
rep->priv_data = mlx5e_create_netdev(esw->dev, &mlx5e_rep_profile, rep);
if (!rep->priv_data) {
mlx5_core_warn(esw->dev, "Failed to create representor for vport %d\n",
rep->vport);
struct net_device *netdev;
int err;

netdev = mlx5e_create_netdev(esw->dev, &mlx5e_rep_profile, rep);
if (!netdev) {
pr_warn("Failed to create representor netdev for vport %d\n",
rep->vport);
return -EINVAL;
}

rep->priv_data = netdev_priv(netdev);

err = mlx5e_attach_netdev(esw->dev, netdev);
if (err) {
pr_warn("Failed to attach representor netdev for vport %d\n",
rep->vport);
goto err_destroy_netdev;
}

err = register_netdev(netdev);
if (err) {
pr_warn("Failed to register representor netdev for vport %d\n",
rep->vport);
goto err_detach_netdev;
}

return 0;

err_detach_netdev:
mlx5e_detach_netdev(esw->dev, netdev);

err_destroy_netdev:
mlx5e_destroy_netdev(esw->dev, rep->priv_data);

return err;

}

void mlx5e_vport_rep_unload(struct mlx5_eswitch *esw,
struct mlx5_eswitch_rep *rep)
{
struct mlx5e_priv *priv = rep->priv_data;
struct net_device *netdev = priv->netdev;

mlx5e_detach_netdev(esw->dev, netdev);
mlx5e_destroy_netdev(esw->dev, priv);
}

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