| 1 | // SPDX-License-Identifier: GPL-2.0-only |
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| 2 | /**************************************************************************** |
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| 3 | * Driver for Solarflare network controllers and boards |
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| 4 | * Copyright 2019 Solarflare Communications Inc. |
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| 5 | * Copyright 2020-2022 Xilinx Inc. |
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| 6 | * |
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| 7 | * This program is free software; you can redistribute it and/or modify it |
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| 8 | * under the terms of the GNU General Public License version 2 as published |
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| 9 | * by the Free Software Foundation, incorporated herein by reference. |
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| 10 | */ |
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| 11 | |
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| 12 | #include "ef100_sriov.h" |
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| 13 | #include "ef100_nic.h" |
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| 14 | #include "ef100_rep.h" |
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| 15 | |
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| 16 | static int efx_ef100_pci_sriov_enable(struct efx_nic *efx, int num_vfs) |
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| 17 | { |
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| 18 | struct ef100_nic_data *nic_data = efx->nic_data; |
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| 19 | struct pci_dev *dev = efx->pci_dev; |
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| 20 | struct efx_rep *efv, *next; |
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| 21 | int rc, i; |
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| 22 | |
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| 23 | efx->vf_count = num_vfs; |
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| 24 | rc = pci_enable_sriov(dev, nr_virtfn: num_vfs); |
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| 25 | if (rc) |
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| 26 | goto fail1; |
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| 27 | |
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| 28 | if (!nic_data->grp_mae) |
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| 29 | return 0; |
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| 30 | |
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| 31 | for (i = 0; i < num_vfs; i++) { |
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| 32 | rc = efx_ef100_vfrep_create(efx, i); |
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| 33 | if (rc) |
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| 34 | goto fail2; |
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| 35 | } |
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| 36 | return 0; |
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| 37 | |
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| 38 | fail2: |
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| 39 | list_for_each_entry_safe(efv, next, &efx->vf_reps, list) |
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| 40 | efx_ef100_vfrep_destroy(efx, efv); |
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| 41 | pci_disable_sriov(dev); |
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| 42 | fail1: |
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| 43 | netif_err(efx, probe, efx->net_dev, "Failed to enable SRIOV VFs\n" ); |
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| 44 | efx->vf_count = 0; |
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| 45 | return rc; |
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| 46 | } |
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| 47 | |
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| 48 | int efx_ef100_pci_sriov_disable(struct efx_nic *efx, bool force) |
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| 49 | { |
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| 50 | struct pci_dev *dev = efx->pci_dev; |
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| 51 | unsigned int vfs_assigned; |
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| 52 | |
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| 53 | vfs_assigned = pci_vfs_assigned(dev); |
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| 54 | if (vfs_assigned && !force) { |
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| 55 | netif_info(efx, drv, efx->net_dev, "VFs are assigned to guests; " |
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| 56 | "please detach them before disabling SR-IOV\n" ); |
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| 57 | return -EBUSY; |
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| 58 | } |
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| 59 | |
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| 60 | efx_ef100_fini_vfreps(efx); |
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| 61 | if (!vfs_assigned) |
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| 62 | pci_disable_sriov(dev); |
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| 63 | return 0; |
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| 64 | } |
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| 65 | |
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| 66 | int efx_ef100_sriov_configure(struct efx_nic *efx, int num_vfs) |
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| 67 | { |
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| 68 | if (num_vfs == 0) |
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| 69 | return efx_ef100_pci_sriov_disable(efx, force: false); |
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| 70 | else |
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| 71 | return efx_ef100_pci_sriov_enable(efx, num_vfs); |
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| 72 | } |
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| 73 | |
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