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@@ -0,0 +1,221 @@
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+/*
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+ * Copyright (c) 2014, Mellanox Technologies inc. All rights reserved.
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+ *
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+ * This software is available to you under a choice of one of two
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+ * licenses. You may choose to be licensed under the terms of the GNU
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+ * General Public License (GPL) Version 2, available from the file
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+ * COPYING in the main directory of this source tree, or the
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+ * OpenIB.org BSD license below:
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+ *
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+ * Redistribution and use in source and binary forms, with or
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+ * without modification, are permitted provided that the following
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+ * conditions are met:
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+ *
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+ * - Redistributions of source code must retain the above
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+ * copyright notice, this list of conditions and the following
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+ * disclaimer.
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+ *
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+ * - Redistributions in binary form must reproduce the above
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+ * copyright notice, this list of conditions and the following
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+ * disclaimer in the documentation and/or other materials
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+ * provided with the distribution.
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+ *
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+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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+ * SOFTWARE.
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+ */
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+
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+#include <linux/pci.h>
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+#include <linux/mlx5/driver.h>
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+#include "mlx5_core.h"
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+
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+static void enable_vfs(struct mlx5_core_dev *dev, int num_vfs)
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+{
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+ struct mlx5_core_sriov *sriov = &dev->priv.sriov;
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+ int err;
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+ int vf;
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+
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+ for (vf = 1; vf <= num_vfs; vf++) {
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+ err = mlx5_core_enable_hca(dev, vf);
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+ if (err) {
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+ mlx5_core_warn(dev, "failed to enable VF %d\n", vf - 1);
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+ } else {
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+ sriov->vfs_ctx[vf - 1].enabled = 1;
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+ mlx5_core_dbg(dev, "successfully enabled VF %d\n", vf - 1);
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+ }
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+ }
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+}
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+
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+static void disable_vfs(struct mlx5_core_dev *dev, int num_vfs)
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+{
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+ struct mlx5_core_sriov *sriov = &dev->priv.sriov;
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+ int vf;
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+
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+ for (vf = 1; vf <= num_vfs; vf++) {
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+ if (sriov->vfs_ctx[vf - 1].enabled) {
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+ if (mlx5_core_disable_hca(dev, vf))
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+ mlx5_core_warn(dev, "failed to disable VF %d\n", vf - 1);
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+ else
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+ sriov->vfs_ctx[vf - 1].enabled = 0;
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+ }
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+ }
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+}
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+
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+static int mlx5_core_create_vfs(struct pci_dev *pdev, int num_vfs)
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+{
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+ struct mlx5_core_dev *dev = pci_get_drvdata(pdev);
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+ int err;
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+
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+ if (pci_num_vf(pdev))
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+ pci_disable_sriov(pdev);
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+
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+ enable_vfs(dev, num_vfs);
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+
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+ err = pci_enable_sriov(pdev, num_vfs);
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+ if (err) {
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+ dev_warn(&pdev->dev, "enable sriov failed %d\n", err);
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+ goto ex;
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+ }
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+
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+ return 0;
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+
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+ex:
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+ disable_vfs(dev, num_vfs);
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+ return err;
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+}
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+
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+static int mlx5_core_sriov_enable(struct pci_dev *pdev, int num_vfs)
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+{
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+ struct mlx5_core_dev *dev = pci_get_drvdata(pdev);
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+ struct mlx5_core_sriov *sriov = &dev->priv.sriov;
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+ int err;
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+
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+ kfree(sriov->vfs_ctx);
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+ sriov->vfs_ctx = kcalloc(num_vfs, sizeof(*sriov->vfs_ctx), GFP_ATOMIC);
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+ if (!sriov->vfs_ctx)
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+ return -ENOMEM;
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+
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+ sriov->enabled_vfs = num_vfs;
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+ err = mlx5_core_create_vfs(pdev, num_vfs);
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+ if (err) {
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+ kfree(sriov->vfs_ctx);
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+ sriov->vfs_ctx = NULL;
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+ return err;
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+ }
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+
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+ return 0;
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+}
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+
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+static void mlx5_core_init_vfs(struct mlx5_core_dev *dev, int num_vfs)
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+{
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+ struct mlx5_core_sriov *sriov = &dev->priv.sriov;
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+
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+ sriov->num_vfs = num_vfs;
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+}
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+
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+static void mlx5_core_cleanup_vfs(struct mlx5_core_dev *dev)
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+{
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+ struct mlx5_core_sriov *sriov;
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+
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+ sriov = &dev->priv.sriov;
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+ disable_vfs(dev, sriov->num_vfs);
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+
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+ if (mlx5_wait_for_vf_pages(dev))
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+ mlx5_core_warn(dev, "timeout claiming VFs pages\n");
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+
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+ sriov->num_vfs = 0;
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+}
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+
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+int mlx5_core_sriov_configure(struct pci_dev *pdev, int num_vfs)
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+{
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+ struct mlx5_core_dev *dev = pci_get_drvdata(pdev);
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+ struct mlx5_core_sriov *sriov = &dev->priv.sriov;
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+ int err;
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+
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+ mlx5_core_dbg(dev, "requsted num_vfs %d\n", num_vfs);
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+ if (!mlx5_core_is_pf(dev))
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+ return -EPERM;
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+
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+ mlx5_core_cleanup_vfs(dev);
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+
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+ if (!num_vfs) {
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+ kfree(sriov->vfs_ctx);
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+ sriov->vfs_ctx = NULL;
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+ if (!pci_vfs_assigned(pdev))
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+ pci_disable_sriov(pdev);
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+ else
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+ pr_info("unloading PF driver while leaving orphan VFs\n");
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+
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+ return 0;
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+ }
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+
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+ err = mlx5_core_sriov_enable(pdev, num_vfs);
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+ if (err) {
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+ dev_warn(&pdev->dev, "mlx5_core_sriov_enable failed %d\n", err);
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+ return err;
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+ }
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+
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+ mlx5_core_init_vfs(dev, num_vfs);
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+
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+ return num_vfs;
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+}
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+
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+static int sync_required(struct pci_dev *pdev)
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+{
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+ struct mlx5_core_dev *dev = pci_get_drvdata(pdev);
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+ struct mlx5_core_sriov *sriov = &dev->priv.sriov;
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+ int cur_vfs = pci_num_vf(pdev);
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+
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+ if (cur_vfs != sriov->num_vfs) {
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+ pr_info("current VFs %d, registered %d - sync needed\n", cur_vfs, sriov->num_vfs);
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+ return 1;
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+ }
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+
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+ return 0;
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+}
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+
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+int mlx5_sriov_init(struct mlx5_core_dev *dev)
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+{
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+ struct mlx5_core_sriov *sriov = &dev->priv.sriov;
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+ struct pci_dev *pdev = dev->pdev;
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+ int cur_vfs;
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+
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+ if (!mlx5_core_is_pf(dev))
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+ return 0;
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+
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+ if (!sync_required(dev->pdev))
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+ return 0;
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+
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+ cur_vfs = pci_num_vf(pdev);
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+ sriov->vfs_ctx = kcalloc(cur_vfs, sizeof(*sriov->vfs_ctx), GFP_KERNEL);
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+ if (!sriov->vfs_ctx)
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+ return -ENOMEM;
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+
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+ sriov->enabled_vfs = cur_vfs;
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+
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+ mlx5_core_init_vfs(dev, cur_vfs);
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+
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+ enable_vfs(dev, cur_vfs);
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+
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+ return 0;
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+}
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+
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+int mlx5_sriov_cleanup(struct mlx5_core_dev *dev)
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+{
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+ struct pci_dev *pdev = dev->pdev;
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+ int err;
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+
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+ if (!mlx5_core_is_pf(dev))
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+ return 0;
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+
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+ err = mlx5_core_sriov_configure(pdev, 0);
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+ if (err)
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+ return err;
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+
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+ return 0;
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+}
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Eli Cohen