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nfp: add port state refresh

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We will need a way of refreshing port state for link settings
get/set.  For get we need to refresh port speed and type.

When settings are changed the reconfiguration may require
reboot before it's effective.  Unregister netdevs affected
by reconfiguration from a workqueue.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2017-04-04 16:12:26 -07:00 committed by David S. Miller
parent cee4295133
commit 172f638c93
3 changed files with 85 additions and 8 deletions
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3
drivers/net/ethernet/netronome/nfp/nfp_main.h
View file

@ -44,6 +44,7 @@
#include <linux/msi.h>
#include <linux/mutex.h>
#include <linux/pci.h>
#include <linux/workqueue.h>
struct dentry;
struct pci_dev;
@ -69,6 +70,7 @@ struct nfp_eth_table;
* @num_netdevs: Number of netdevs spawned
* @ports: Linked list of port structures (struct nfp_net)
* @port_lock: Protects @ports, @num_ports, @num_netdevs
* @port_refresh_work: Work entry for taking netdevs out
*/
struct nfp_pf {
struct pci_dev *pdev;
@ -94,6 +96,7 @@ struct nfp_pf {
unsigned int num_netdevs;
struct list_head ports;
struct work_struct port_refresh_work;
struct mutex port_lock;
};

1
drivers/net/ethernet/netronome/nfp/nfp_net.h
View file

@ -813,6 +813,7 @@ struct nfp_net_dp *nfp_net_clone_dp(struct nfp_net *nn);
int nfp_net_ring_reconfig(struct nfp_net *nn, struct nfp_net_dp *new);
bool nfp_net_link_changed_read_clear(struct nfp_net *nn);
void nfp_net_refresh_port_config(struct nfp_net *nn);
#ifdef CONFIG_NFP_DEBUG
void nfp_net_debugfs_create(void);

89
drivers/net/ethernet/netronome/nfp/nfp_net_main.c
View file

@ -47,6 +47,7 @@
#include <linux/pci_regs.h>
#include <linux/msi.h>
#include <linux/random.h>
#include <linux/rtnetlink.h>
#include "nfpcore/nfp.h"
#include "nfpcore/nfp_cpp.h"
@ -468,6 +469,82 @@ nfp_net_pf_spawn_netdevs(struct nfp_pf *pf,
return err;
}
static void nfp_net_pci_remove_finish(struct nfp_pf *pf)
{
nfp_net_debugfs_dir_clean(&pf->ddir);
nfp_net_irqs_disable(pf->pdev);
kfree(pf->irq_entries);
nfp_cpp_area_release_free(pf->rx_area);
nfp_cpp_area_release_free(pf->tx_area);
nfp_cpp_area_release_free(pf->ctrl_area);
}
static void nfp_net_refresh_netdevs(struct work_struct *work)
{
struct nfp_pf *pf = container_of(work, struct nfp_pf,
port_refresh_work);
struct nfp_net *nn, *next;
mutex_lock(&pf->port_lock);
/* Check for nfp_net_pci_remove() racing against us */
if (list_empty(&pf->ports))
goto out;
list_for_each_entry_safe(nn, next, &pf->ports, port_list) {
if (!nn->eth_port) {
nfp_warn(pf->cpp, "Warning: port %d not present after reconfig\n",
nn->eth_port->eth_index);
continue;
}
if (!nn->eth_port->override_changed)
continue;
nn_warn(nn, "Port config changed, unregistering. Reboot required before port will be operational again.\n");
nfp_net_debugfs_dir_clean(&nn->debugfs_dir);
nfp_net_netdev_clean(nn->dp.netdev);
list_del(&nn->port_list);
pf->num_netdevs--;
nfp_net_netdev_free(nn);
}
if (list_empty(&pf->ports))
nfp_net_pci_remove_finish(pf);
out:
mutex_unlock(&pf->port_lock);
}
void nfp_net_refresh_port_config(struct nfp_net *nn)
{
struct nfp_pf *pf = pci_get_drvdata(nn->pdev);
struct nfp_eth_table *old_table;
ASSERT_RTNL();
old_table = pf->eth_tbl;
list_for_each_entry(nn, &pf->ports, port_list)
nfp_net_link_changed_read_clear(nn);
pf->eth_tbl = nfp_eth_read_ports(pf->cpp);
if (!pf->eth_tbl) {
pf->eth_tbl = old_table;
nfp_err(pf->cpp, "Error refreshing port config!\n");
return;
}
list_for_each_entry(nn, &pf->ports, port_list)
nn->eth_port = nfp_net_find_port(pf, nn->eth_port->eth_index);
kfree(old_table);
schedule_work(&pf->port_refresh_work);
}
/*
* PCI device functions
*/
@ -481,6 +558,7 @@ int nfp_net_pci_probe(struct nfp_pf *pf)
int stride;
int err;
INIT_WORK(&pf->port_refresh_work, nfp_net_refresh_netdevs);
mutex_init(&pf->port_lock);
/* Verify that the board has completed initialization */
@ -602,14 +680,9 @@ void nfp_net_pci_remove(struct nfp_pf *pf)
nfp_net_pf_free_netdevs(pf);
nfp_net_debugfs_dir_clean(&pf->ddir);
nfp_net_irqs_disable(pf->pdev);
kfree(pf->irq_entries);
nfp_cpp_area_release_free(pf->rx_area);
nfp_cpp_area_release_free(pf->tx_area);
nfp_cpp_area_release_free(pf->ctrl_area);
nfp_net_pci_remove_finish(pf);
out:
mutex_unlock(&pf->port_lock);
cancel_work_sync(&pf->port_refresh_work);
}