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nfp: allocate a private workqueue for driver work

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Since we grab pf->lock around pci_enable_sriov() we can no longer
safely queue work which may also grab that lock onto system workqueue.
pci_enable_sriov() will flush system workqueue as part to wait for VF
probing.

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 2017-06-27 00:50:27 -07:00 committed by David S. Miller
parent e3f28473b8
commit 6d48ceb27a
3 changed files with 14 additions and 1 deletions
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9
drivers/net/ethernet/netronome/nfp/nfp_main.c
View File

@ -376,6 +376,12 @@ static int nfp_pci_probe(struct pci_dev *pdev,
pci_set_drvdata(pdev, pf);
pf->pdev = pdev;
pf->wq = alloc_workqueue("nfp-%s", 0, 2, pci_name(pdev));
if (!pf->wq) {
err = -ENOMEM;
goto err_pci_priv_unset;
}
pf->cpp = nfp_cpp_from_nfp6000_pcie(pdev);
if (IS_ERR_OR_NULL(pf->cpp)) {
err = PTR_ERR(pf->cpp);
@ -445,6 +451,8 @@ static int nfp_pci_probe(struct pci_dev *pdev,
kfree(pf->hwinfo);
nfp_cpp_free(pf->cpp);
err_disable_msix:
destroy_workqueue(pf->wq);
err_pci_priv_unset:
pci_set_drvdata(pdev, NULL);
mutex_destroy(&pf->lock);
devlink_free(devlink);
@ -477,6 +485,7 @@ static void nfp_pci_remove(struct pci_dev *pdev)
if (pf->fw_loaded)
nfp_fw_unload(pf);
destroy_workqueue(pf->wq);
pci_set_drvdata(pdev, NULL);
kfree(pf->hwinfo);
nfp_cpp_free(pf->cpp);

4
drivers/net/ethernet/netronome/nfp/nfp_main.h
View File

@ -89,6 +89,7 @@ struct nfp_rtsym_table;
* @num_vnics: Number of vNICs spawned
* @vnics: Linked list of vNIC structures (struct nfp_net)
* @ports: Linked list of port structures (struct nfp_port)
* @wq: Workqueue for running works which need to grab @lock
* @port_refresh_work: Work entry for taking netdevs out
* @lock: Protects all fields which may change after probe
*/
@ -131,7 +132,10 @@ struct nfp_pf {
struct list_head vnics;
struct list_head ports;
struct workqueue_struct *wq;
struct work_struct port_refresh_work;
struct mutex lock;
};

2
drivers/net/ethernet/netronome/nfp/nfp_net_main.c
View File

@ -682,7 +682,7 @@ void nfp_net_refresh_port_table(struct nfp_port *port)
set_bit(NFP_PORT_CHANGED, &port->flags);
schedule_work(&pf->port_refresh_work);
queue_work(pf->wq, &pf->port_refresh_work);
}
int nfp_net_refresh_eth_port(struct nfp_port *port)