drivers/net/ethernet/sfc/ef100_sriov.c

Source file repositories/reference/linux-study-clean/drivers/net/ethernet/sfc/ef100_sriov.c

File Facts

System
Linux kernel
Corpus path
drivers/net/ethernet/sfc/ef100_sriov.c
Extension
.c
Size
1870 bytes
Lines
73
Domain
Driver Families
Bucket
drivers/net
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0-only
/****************************************************************************
 * Driver for Solarflare network controllers and boards
 * Copyright 2019 Solarflare Communications Inc.
 * Copyright 2020-2022 Xilinx Inc.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 as published
 * by the Free Software Foundation, incorporated herein by reference.
 */

#include "ef100_sriov.h"
#include "ef100_nic.h"
#include "ef100_rep.h"

static int efx_ef100_pci_sriov_enable(struct efx_nic *efx, int num_vfs)
{
	struct ef100_nic_data *nic_data = efx->nic_data;
	struct pci_dev *dev = efx->pci_dev;
	struct efx_rep *efv, *next;
	int rc, i;

	efx->vf_count = num_vfs;
	rc = pci_enable_sriov(dev, num_vfs);
	if (rc)
		goto fail1;

	if (!nic_data->grp_mae)
		return 0;

	for (i = 0; i < num_vfs; i++) {
		rc = efx_ef100_vfrep_create(efx, i);
		if (rc)
			goto fail2;
	}
	return 0;

fail2:
	list_for_each_entry_safe(efv, next, &efx->vf_reps, list)
		efx_ef100_vfrep_destroy(efx, efv);
	pci_disable_sriov(dev);
fail1:
	netif_err(efx, probe, efx->net_dev, "Failed to enable SRIOV VFs\n");
	efx->vf_count = 0;
	return rc;
}

int efx_ef100_pci_sriov_disable(struct efx_nic *efx, bool force)
{
	struct pci_dev *dev = efx->pci_dev;
	unsigned int vfs_assigned;

	vfs_assigned = pci_vfs_assigned(dev);
	if (vfs_assigned && !force) {
		netif_info(efx, drv, efx->net_dev, "VFs are assigned to guests; "
			   "please detach them before disabling SR-IOV\n");
		return -EBUSY;
	}

	efx_ef100_fini_vfreps(efx);
	if (!vfs_assigned)
		pci_disable_sriov(dev);
	return 0;
}

int efx_ef100_sriov_configure(struct efx_nic *efx, int num_vfs)
{
	if (num_vfs == 0)
		return efx_ef100_pci_sriov_disable(efx, false);
	else
		return efx_ef100_pci_sriov_enable(efx, num_vfs);
}

Annotation

Implementation Notes