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Date: Thu, 28 Apr 2022 12:39:33 +0100
From: Edward Cree <ecree.xilinx@...il.com>
To: davem@...emloft.net, pabeni@...hat.com, kuba@...nel.org,
edumazet@...gle.com
Cc: pieter.jansen-van-vuuren@....com, netdev@...r.kernel.org,
habetsm.xilinx@...il.com
Subject: [PATCH net-next] sfc: add EF100 VF support via a write to
sriov_numvfs
From: Pieter Jansen van Vuuren <pieter.jansen-van-vuuren@....com>
This patch extends the EF100 PF driver by adding .sriov_configure()
which would allow users to enable and disable virtual functions
using the sriov sysfs.
Signed-off-by: Pieter Jansen van Vuuren <pieter.jansen-van-vuuren@....com>
Signed-off-by: Edward Cree <ecree.xilinx@...il.com>
---
drivers/net/ethernet/sfc/Makefile | 2 +-
drivers/net/ethernet/sfc/ef100.c | 27 ++++++++++++-
drivers/net/ethernet/sfc/ef100_nic.c | 6 ++-
drivers/net/ethernet/sfc/ef100_sriov.c | 56 ++++++++++++++++++++++++++
drivers/net/ethernet/sfc/ef100_sriov.h | 14 +++++++
5 files changed, 102 insertions(+), 3 deletions(-)
create mode 100644 drivers/net/ethernet/sfc/ef100_sriov.c
create mode 100644 drivers/net/ethernet/sfc/ef100_sriov.h
diff --git a/drivers/net/ethernet/sfc/Makefile b/drivers/net/ethernet/sfc/Makefile
index 8bd01c429f91..5ba98769b52b 100644
--- a/drivers/net/ethernet/sfc/Makefile
+++ b/drivers/net/ethernet/sfc/Makefile
@@ -8,7 +8,7 @@ sfc-y += efx.o efx_common.o efx_channels.o nic.o \
ef100.o ef100_nic.o ef100_netdev.o \
ef100_ethtool.o ef100_rx.o ef100_tx.o
sfc-$(CONFIG_SFC_MTD) += mtd.o
-sfc-$(CONFIG_SFC_SRIOV) += sriov.o siena_sriov.o ef10_sriov.o
+sfc-$(CONFIG_SFC_SRIOV) += sriov.o siena_sriov.o ef10_sriov.o ef100_sriov.o
obj-$(CONFIG_SFC) += sfc.o
diff --git a/drivers/net/ethernet/sfc/ef100.c b/drivers/net/ethernet/sfc/ef100.c
index ffdb36715a49..173f0ecebc70 100644
--- a/drivers/net/ethernet/sfc/ef100.c
+++ b/drivers/net/ethernet/sfc/ef100.c
@@ -2,7 +2,7 @@
/****************************************************************************
* Driver for Solarflare network controllers and boards
* Copyright 2005-2018 Solarflare Communications Inc.
- * Copyright 2019-2020 Xilinx Inc.
+ * Copyright 2019-2022 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
@@ -17,6 +17,7 @@
#include "io.h"
#include "ef100_nic.h"
#include "ef100_netdev.h"
+#include "ef100_sriov.h"
#include "ef100_regs.h"
#include "ef100.h"
@@ -436,6 +437,10 @@ static void ef100_pci_remove(struct pci_dev *pci_dev)
* blocks, so we have to do it before PCI removal.
*/
unregister_netdevice_notifier(&efx->netdev_notifier);
+#if defined(CONFIG_SFC_SRIOV)
+ if (!efx->type->is_vf)
+ efx_ef100_pci_sriov_disable(efx);
+#endif
ef100_remove(efx);
efx_fini_io(efx);
netif_dbg(efx, drv, efx->net_dev, "shutdown successful\n");
@@ -524,6 +529,23 @@ static int ef100_pci_probe(struct pci_dev *pci_dev,
return rc;
}
+#ifdef CONFIG_SFC_SRIOV
+static int ef100_pci_sriov_configure(struct pci_dev *dev, int num_vfs)
+{
+ struct efx_nic *efx = pci_get_drvdata(dev);
+ int rc;
+
+ if (efx->type->sriov_configure) {
+ rc = efx->type->sriov_configure(efx, num_vfs);
+ if (rc)
+ return rc;
+ else
+ return num_vfs;
+ }
+ return -ENOENT;
+}
+#endif
+
/* PCI device ID table */
static const struct pci_device_id ef100_pci_table[] = {
{PCI_DEVICE(PCI_VENDOR_ID_XILINX, 0x0100), /* Riverhead PF */
@@ -538,6 +560,9 @@ struct pci_driver ef100_pci_driver = {
.id_table = ef100_pci_table,
.probe = ef100_pci_probe,
.remove = ef100_pci_remove,
+#ifdef CONFIG_SFC_SRIOV
+ .sriov_configure = ef100_pci_sriov_configure,
+#endif
.err_handler = &efx_err_handlers,
};
diff --git a/drivers/net/ethernet/sfc/ef100_nic.c b/drivers/net/ethernet/sfc/ef100_nic.c
index a07cbf45a326..b04911bc8c57 100644
--- a/drivers/net/ethernet/sfc/ef100_nic.c
+++ b/drivers/net/ethernet/sfc/ef100_nic.c
@@ -2,7 +2,7 @@
/****************************************************************************
* Driver for Solarflare network controllers and boards
* Copyright 2018 Solarflare Communications Inc.
- * Copyright 2019-2020 Xilinx Inc.
+ * Copyright 2019-2022 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
@@ -22,6 +22,7 @@
#include "mcdi_filters.h"
#include "ef100_rx.h"
#include "ef100_tx.h"
+#include "ef100_sriov.h"
#include "ef100_netdev.h"
#include "rx_common.h"
@@ -787,6 +788,9 @@ const struct efx_nic_type ef100_pf_nic_type = {
.update_stats = ef100_update_stats,
.pull_stats = efx_mcdi_mac_pull_stats,
.stop_stats = efx_mcdi_mac_stop_stats,
+#ifdef CONFIG_SFC_SRIOV
+ .sriov_configure = efx_ef100_sriov_configure,
+#endif
/* Per-type bar/size configuration not used on ef100. Location of
* registers is defined by extended capabilities.
diff --git a/drivers/net/ethernet/sfc/ef100_sriov.c b/drivers/net/ethernet/sfc/ef100_sriov.c
new file mode 100644
index 000000000000..664578176bfe
--- /dev/null
+++ b/drivers/net/ethernet/sfc/ef100_sriov.c
@@ -0,0 +1,56 @@
+// 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"
+
+static int efx_ef100_pci_sriov_enable(struct efx_nic *efx, int num_vfs)
+{
+ struct pci_dev *dev = efx->pci_dev;
+ int rc;
+
+ efx->vf_count = num_vfs;
+ rc = pci_enable_sriov(dev, num_vfs);
+ if (rc)
+ goto fail;
+
+ return 0;
+
+fail:
+ 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)
+{
+ struct pci_dev *dev = efx->pci_dev;
+ unsigned int vfs_assigned;
+
+ vfs_assigned = pci_vfs_assigned(dev);
+ if (vfs_assigned) {
+ netif_info(efx, drv, efx->net_dev, "VFs are assigned to guests; "
+ "please detach them before disabling SR-IOV\n");
+ return -EBUSY;
+ }
+
+ 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);
+ else
+ return efx_ef100_pci_sriov_enable(efx, num_vfs);
+}
diff --git a/drivers/net/ethernet/sfc/ef100_sriov.h b/drivers/net/ethernet/sfc/ef100_sriov.h
new file mode 100644
index 000000000000..c48fccd46c57
--- /dev/null
+++ b/drivers/net/ethernet/sfc/ef100_sriov.h
@@ -0,0 +1,14 @@
+/* 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 "net_driver.h"
+
+int efx_ef100_sriov_configure(struct efx_nic *efx, int num_vfs);
+int efx_ef100_pci_sriov_disable(struct efx_nic *efx);
--
2.17.1
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