netdev - [PATCH mlx5-next 4/4] net/mlx5: Allow to the users to configure number of MSI-X vectors

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Date:   Sun,  3 Jan 2021 10:24:40 +0200
From:   Leon Romanovsky <leon@...nel.org>
To:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Saeed Mahameed <saeedm@...dia.com>
Cc:     Leon Romanovsky <leonro@...dia.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Jakub Kicinski <kuba@...nel.org>, linux-pci@...r.kernel.org,
        linux-rdma@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH mlx5-next 4/4] net/mlx5: Allow to the users to configure number of MSI-X vectors

From: Leon Romanovsky <leonro@...dia.com>

Implement ability to configure MSI-X for the SR-IOV VFs.

Signed-off-by: Leon Romanovsky <leonro@...dia.com>
---
 .../net/ethernet/mellanox/mlx5/core/main.c    |  1 +
 .../ethernet/mellanox/mlx5/core/mlx5_core.h   |  1 +
 .../net/ethernet/mellanox/mlx5/core/pci_irq.c |  4 +--
 .../net/ethernet/mellanox/mlx5/core/sriov.c   | 35 +++++++++++++++++++
 4 files changed, 39 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/main.c b/drivers/net/ethernet/mellanox/mlx5/core/main.c
index 8269cfbfc69d..334b3b5077c5 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/main.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/main.c
@@ -1647,6 +1647,7 @@ static struct pci_driver mlx5_core_driver = {
 	.shutdown	= shutdown,
 	.err_handler	= &mlx5_err_handler,
 	.sriov_configure   = mlx5_core_sriov_configure,
+	.sriov_set_msix_vec_count = mlx5_core_sriov_set_msix_vec_count,
 };

 static void mlx5_core_verify_params(void)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h b/drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h
index 5babb4434a87..8a2523d2d43a 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h
+++ b/drivers/net/ethernet/mellanox/mlx5/core/mlx5_core.h
@@ -138,6 +138,7 @@ void mlx5_sriov_cleanup(struct mlx5_core_dev *dev);
 int mlx5_sriov_attach(struct mlx5_core_dev *dev);
 void mlx5_sriov_detach(struct mlx5_core_dev *dev);
 int mlx5_core_sriov_configure(struct pci_dev *dev, int num_vfs);
+int mlx5_core_sriov_set_msix_vec_count(struct pci_dev *vf, int msix_vec_count);
 int mlx5_core_enable_hca(struct mlx5_core_dev *dev, u16 func_id);
 int mlx5_core_disable_hca(struct mlx5_core_dev *dev, u16 func_id);
 int mlx5_create_scheduling_element_cmd(struct mlx5_core_dev *dev, u8 hierarchy,
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/pci_irq.c b/drivers/net/ethernet/mellanox/mlx5/core/pci_irq.c
index 135078e8dd55..65a761346385 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/pci_irq.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/pci_irq.c
@@ -59,7 +59,7 @@ int mlx5_get_default_msix_vec_count(struct mlx5_core_dev *dev, int num_vfs)
 {
 	int num_vf_msix, min_msix, max_msix;

-	num_vf_msix = MLX5_CAP_GEN(dev, num_total_dynamic_vf_msix);
+	num_vf_msix = MLX5_CAP_GEN_MAX(dev, num_total_dynamic_vf_msix);
 	if (!num_vf_msix)
 		return 0;

@@ -83,7 +83,7 @@ int mlx5_set_msix_vec_count(struct mlx5_core_dev *dev, int function_id,
 	void *hca_cap, *cap;
 	int ret;

-	num_vf_msix = MLX5_CAP_GEN(dev, num_total_dynamic_vf_msix);
+	num_vf_msix = MLX5_CAP_GEN_MAX(dev, num_total_dynamic_vf_msix);
 	if (!num_vf_msix)
 		return 0;

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/sriov.c b/drivers/net/ethernet/mellanox/mlx5/core/sriov.c
index c59efb1e7a26..e63861498ef3 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/sriov.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/sriov.c
@@ -188,6 +188,41 @@ int mlx5_core_sriov_configure(struct pci_dev *pdev, int num_vfs)
 	return err ? err : num_vfs;
 }

+int mlx5_core_sriov_set_msix_vec_count(struct pci_dev *vf, int msix_vec_count)
+{
+	struct pci_dev *pf = pci_physfn(vf);
+	struct mlx5_core_sriov *sriov;
+	struct mlx5_core_dev *dev;
+	int num_vf_msix, id;
+
+	dev = pci_get_drvdata(pf);
+	num_vf_msix = MLX5_CAP_GEN_MAX(dev, num_total_dynamic_vf_msix);
+	if (!num_vf_msix)
+		return -EOPNOTSUPP;
+
+	if (!msix_vec_count)
+		msix_vec_count =
+			mlx5_get_default_msix_vec_count(dev, pci_num_vf(pf));
+
+	sriov = &dev->priv.sriov;
+
+	/* Reversed translation of PCI VF function number to the internal
+	 * function_id, which exists in the name of virtfn symlink.
+	 */
+	for (id = 0; id < pci_num_vf(pf); id++) {
+		if (!sriov->vfs_ctx[id].enabled)
+			continue;
+
+		if (vf->devfn == pci_iov_virtfn_devfn(pf, id))
+			break;
+	}
+
+	if (id == pci_num_vf(pf) || !sriov->vfs_ctx[id].enabled)
+		return -EINVAL;
+
+	return mlx5_set_msix_vec_count(dev, id + 1, msix_vec_count);
+}
+
 int mlx5_sriov_attach(struct mlx5_core_dev *dev)
 {
 	if (!mlx5_core_is_pf(dev) || !pci_num_vf(dev->pdev))
--
2.29.2