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Date: Fri, 9 Jan 2015 11:25:46 -0700
From: Bjorn Helgaas <bhelgaas@...gle.com>
To: Eli Cohen <eli@....mellanox.co.il>
Cc: davem@...emloft.net, linux-pci@...r.kernel.org,
netdev@...r.kernel.org, ogerlitz@...lanox.com,
yevgenyp@...lanox.com, Eli Cohen <eli@...lanox.com>,
Donald Dutile <ddutile@...hat.com>
Subject: Re: [PATCH RFC] pci: Control whether VFs are probed on
pci_enable_sriov
On Sun, Dec 07, 2014 at 03:08:13PM +0200, Eli Cohen wrote:
> Sometimes it is not desirable to probe the virtual fuctions right away,
> but rather leave the decision to the host's administrator.
>
> This can save host side resource usage by VF instances which would be
> eventually probed to VMs.
>
> Use a parameter to pci_enable_sriov to control that policy, and modify
> all current callers such that they retain the same functionality.
>
> Use a one shot flag on struct pci_device which is cleared after the
> first probe is ignored so subsequent attempts go through.
>
> Cc: Donald Dutile <ddutile@...hat.com>
> Signed-off-by: Eli Cohen <eli@...lanox.com>
Seems like we never really reached a consensus here. Please repost if you
want to continue down this path.
Bjorn
> ---
> This approach is used by the mlx5 driver SRIOV implementation, so
> sending this to get feedback from the PCI and networking folks.
>
> drivers/misc/genwqe/card_base.c | 2 +-
> drivers/net/ethernet/broadcom/bnx2x/bnx2x_sriov.c | 2 +-
> drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c | 2 +-
> drivers/net/ethernet/cisco/enic/enic_main.c | 2 +-
> drivers/net/ethernet/emulex/benet/be_main.c | 2 +-
> drivers/net/ethernet/intel/fm10k/fm10k_iov.c | 2 +-
> drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c | 2 +-
> drivers/net/ethernet/intel/igb/igb_main.c | 2 +-
> drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c | 4 ++--
> drivers/net/ethernet/mellanox/mlx4/main.c | 2 +-
> drivers/net/ethernet/neterion/vxge/vxge-main.c | 2 +-
> drivers/net/ethernet/qlogic/qlcnic/qlcnic_sriov_pf.c | 2 +-
> drivers/net/ethernet/sfc/siena_sriov.c | 2 +-
> drivers/pci/iov.c | 12 +++++++-----
> drivers/pci/pci-driver.c | 11 ++++++++---
> drivers/scsi/lpfc/lpfc_init.c | 2 +-
> include/linux/pci.h | 5 +++--
> 17 files changed, 33 insertions(+), 25 deletions(-)
>
> diff --git a/drivers/misc/genwqe/card_base.c b/drivers/misc/genwqe/card_base.c
> index 4cf8f82cfca2..69253ca17506 100644
> --- a/drivers/misc/genwqe/card_base.c
> +++ b/drivers/misc/genwqe/card_base.c
> @@ -1325,7 +1325,7 @@ static int genwqe_sriov_configure(struct pci_dev *dev, int numvfs)
>
> if (numvfs > 0) {
> genwqe_setup_vf_jtimer(cd);
> - rc = pci_enable_sriov(dev, numvfs);
> + rc = pci_enable_sriov(dev, numvfs, 1);
> if (rc < 0)
> return rc;
> return numvfs;
> diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_sriov.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_sriov.c
> index c88b20af87df..773b20224a47 100644
> --- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_sriov.c
> +++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_sriov.c
> @@ -2570,7 +2570,7 @@ int bnx2x_enable_sriov(struct bnx2x *bp)
> if (rc)
> return rc;
>
> - rc = pci_enable_sriov(bp->pdev, req_vfs);
> + rc = pci_enable_sriov(bp->pdev, req_vfs, 1);
> if (rc) {
> BNX2X_ERR("pci_enable_sriov failed with %d\n", rc);
> return rc;
> diff --git a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
> index 3aea82bb9039..6e8afbfd3eba 100644
> --- a/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
> +++ b/drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c
> @@ -6597,7 +6597,7 @@ static int init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
> sriov:
> #ifdef CONFIG_PCI_IOV
> if (func < ARRAY_SIZE(num_vf) && num_vf[func] > 0)
> - if (pci_enable_sriov(pdev, num_vf[func]) == 0)
> + if (pci_enable_sriov(pdev, num_vf[func], 1) == 0)
> dev_info(&pdev->dev,
> "instantiated %u virtual functions\n",
> num_vf[func]);
> diff --git a/drivers/net/ethernet/cisco/enic/enic_main.c b/drivers/net/ethernet/cisco/enic/enic_main.c
> index 86ee350e57f0..8a8b1d86f18a 100644
> --- a/drivers/net/ethernet/cisco/enic/enic_main.c
> +++ b/drivers/net/ethernet/cisco/enic/enic_main.c
> @@ -2421,7 +2421,7 @@ static int enic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
> pci_read_config_word(pdev, pos + PCI_SRIOV_TOTAL_VF,
> &enic->num_vfs);
> if (enic->num_vfs) {
> - err = pci_enable_sriov(pdev, enic->num_vfs);
> + err = pci_enable_sriov(pdev, enic->num_vfs, 1);
> if (err) {
> dev_err(dev, "SRIOV enable failed, aborting."
> " pci_enable_sriov() returned %d\n",
> diff --git a/drivers/net/ethernet/emulex/benet/be_main.c b/drivers/net/ethernet/emulex/benet/be_main.c
> index dc77ec2bdafd..a96491777ac4 100644
> --- a/drivers/net/ethernet/emulex/benet/be_main.c
> +++ b/drivers/net/ethernet/emulex/benet/be_main.c
> @@ -3274,7 +3274,7 @@ static int be_vf_setup(struct be_adapter *adapter)
> }
>
> if (!old_vfs) {
> - status = pci_enable_sriov(adapter->pdev, adapter->num_vfs);
> + status = pci_enable_sriov(adapter->pdev, adapter->num_vfs, 1);
> if (status) {
> dev_err(dev, "SRIOV enable failed\n");
> adapter->num_vfs = 0;
> diff --git a/drivers/net/ethernet/intel/fm10k/fm10k_iov.c b/drivers/net/ethernet/intel/fm10k/fm10k_iov.c
> index 060190864238..04a3dc5acc28 100644
> --- a/drivers/net/ethernet/intel/fm10k/fm10k_iov.c
> +++ b/drivers/net/ethernet/intel/fm10k/fm10k_iov.c
> @@ -408,7 +408,7 @@ int fm10k_iov_configure(struct pci_dev *pdev, int num_vfs)
> */
> fm10k_disable_aer_comp_abort(pdev);
>
> - err = pci_enable_sriov(pdev, num_vfs);
> + err = pci_enable_sriov(pdev, num_vfs, 1);
> if (err) {
> dev_err(&pdev->dev,
> "Enable PCI SR-IOV failed: %d\n", err);
> diff --git a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
> index 668d860275d6..fe56e09725f2 100644
> --- a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
> +++ b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
> @@ -852,7 +852,7 @@ int i40e_alloc_vfs(struct i40e_pf *pf, u16 num_alloc_vfs)
>
> /* Check to see if we're just allocating resources for extant VFs */
> if (pci_num_vf(pf->pdev) != num_alloc_vfs) {
> - ret = pci_enable_sriov(pf->pdev, num_alloc_vfs);
> + ret = pci_enable_sriov(pf->pdev, num_alloc_vfs, 1);
> if (ret) {
> dev_err(&pf->pdev->dev,
> "Failed to enable SR-IOV, error %d.\n", ret);
> diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
> index 3c0221620c9d..da01326ef550 100644
> --- a/drivers/net/ethernet/intel/igb/igb_main.c
> +++ b/drivers/net/ethernet/intel/igb/igb_main.c
> @@ -2742,7 +2742,7 @@ static int igb_enable_sriov(struct pci_dev *pdev, int num_vfs)
>
> /* only call pci_enable_sriov() if no VFs are allocated already */
> if (!old_vfs) {
> - err = pci_enable_sriov(pdev, adapter->vfs_allocated_count);
> + err = pci_enable_sriov(pdev, adapter->vfs_allocated_count, 1);
> if (err)
> goto err_out;
> }
> diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c
> index 04eee7c7b653..74b33483a0d1 100644
> --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c
> +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_sriov.c
> @@ -149,7 +149,7 @@ void ixgbe_enable_sriov(struct ixgbe_adapter *adapter)
> */
> adapter->num_vfs = min_t(unsigned int, adapter->num_vfs, IXGBE_MAX_VFS_DRV_LIMIT);
>
> - err = pci_enable_sriov(adapter->pdev, adapter->num_vfs);
> + err = pci_enable_sriov(adapter->pdev, adapter->num_vfs, 1);
> if (err) {
> e_err(probe, "Failed to enable PCI sriov: %d\n", err);
> adapter->num_vfs = 0;
> @@ -270,7 +270,7 @@ static int ixgbe_pci_sriov_enable(struct pci_dev *dev, int num_vfs)
> for (i = 0; i < adapter->num_vfs; i++)
> ixgbe_vf_configuration(dev, (i | 0x10000000));
>
> - err = pci_enable_sriov(dev, num_vfs);
> + err = pci_enable_sriov(dev, num_vfs, 1);
> if (err) {
> e_dev_warn("Failed to enable PCI sriov: %d\n", err);
> return err;
> diff --git a/drivers/net/ethernet/mellanox/mlx4/main.c b/drivers/net/ethernet/mellanox/mlx4/main.c
> index 3044f9e623cb..ae38b556ec13 100644
> --- a/drivers/net/ethernet/mellanox/mlx4/main.c
> +++ b/drivers/net/ethernet/mellanox/mlx4/main.c
> @@ -2350,7 +2350,7 @@ static u64 mlx4_enable_sriov(struct mlx4_dev *dev, struct pci_dev *pdev,
> existing_vfs, total_vfs);
> } else {
> mlx4_warn(dev, "Enabling SR-IOV with %d VFs\n", total_vfs);
> - err = pci_enable_sriov(pdev, total_vfs);
> + err = pci_enable_sriov(pdev, total_vfs, 1);
> }
> if (err) {
> mlx4_err(dev, "Failed to enable SR-IOV, continuing without SR-IOV (err = %d)\n",
> diff --git a/drivers/net/ethernet/neterion/vxge/vxge-main.c b/drivers/net/ethernet/neterion/vxge/vxge-main.c
> index cc0485e3c621..c341e73fc68c 100644
> --- a/drivers/net/ethernet/neterion/vxge/vxge-main.c
> +++ b/drivers/net/ethernet/neterion/vxge/vxge-main.c
> @@ -4495,7 +4495,7 @@ vxge_probe(struct pci_dev *pdev, const struct pci_device_id *pre)
> /* Enable SRIOV mode, if firmware has SRIOV support and if it is a PF */
> if (is_sriov(function_mode) && !is_sriov_initialized(pdev) &&
> (ll_config->intr_type != INTA)) {
> - ret = pci_enable_sriov(pdev, num_vfs);
> + ret = pci_enable_sriov(pdev, num_vfs, 1);
> if (ret)
> vxge_debug_ll_config(VXGE_ERR,
> "Failed in enabling SRIOV mode: %d\n", ret);
> diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_sriov_pf.c b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_sriov_pf.c
> index a29538b86edf..b483705a1ef1 100644
> --- a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_sriov_pf.c
> +++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_sriov_pf.c
> @@ -570,7 +570,7 @@ static int qlcnic_sriov_pf_enable(struct qlcnic_adapter *adapter, int num_vfs)
> if (!qlcnic_sriov_enable_check(adapter))
> return 0;
>
> - err = pci_enable_sriov(adapter->pdev, num_vfs);
> + err = pci_enable_sriov(adapter->pdev, num_vfs, 1);
> if (err)
> qlcnic_sriov_pf_cleanup(adapter);
>
> diff --git a/drivers/net/ethernet/sfc/siena_sriov.c b/drivers/net/ethernet/sfc/siena_sriov.c
> index a8bbbad68a88..6804ed04cfcd 100644
> --- a/drivers/net/ethernet/sfc/siena_sriov.c
> +++ b/drivers/net/ethernet/sfc/siena_sriov.c
> @@ -1332,7 +1332,7 @@ int efx_siena_sriov_init(struct efx_nic *efx)
>
> /* At this point we must be ready to accept VFDI requests */
>
> - rc = pci_enable_sriov(efx->pci_dev, efx->vf_count);
> + rc = pci_enable_sriov(efx->pci_dev, efx->vf_count, 1);
> if (rc)
> goto fail_pci;
>
> diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
> index 4d109c07294a..f6aba5beea78 100644
> --- a/drivers/pci/iov.c
> +++ b/drivers/pci/iov.c
> @@ -57,7 +57,7 @@ static void virtfn_remove_bus(struct pci_bus *physbus, struct pci_bus *virtbus)
> pci_remove_bus(virtbus);
> }
>
> -static int virtfn_add(struct pci_dev *dev, int id, int reset)
> +static int virtfn_add(struct pci_dev *dev, int id, int reset, int probe)
> {
> int i;
> int rc = -ENOMEM;
> @@ -85,6 +85,7 @@ static int virtfn_add(struct pci_dev *dev, int id, int reset)
> virtfn->physfn = pci_dev_get(dev);
> virtfn->is_virtfn = 1;
> virtfn->multifunction = 0;
> + virtfn->probe_vf = probe;
>
> for (i = 0; i < PCI_SRIOV_NUM_BARS; i++) {
> res = dev->resource + PCI_IOV_RESOURCES + i;
> @@ -170,7 +171,7 @@ static void virtfn_remove(struct pci_dev *dev, int id, int reset)
> pci_dev_put(dev);
> }
>
> -static int sriov_enable(struct pci_dev *dev, int nr_virtfn)
> +static int sriov_enable(struct pci_dev *dev, int nr_virtfn, int probe_vfs)
> {
> int rc;
> int i, j;
> @@ -255,7 +256,7 @@ static int sriov_enable(struct pci_dev *dev, int nr_virtfn)
> initial = nr_virtfn;
>
> for (i = 0; i < initial; i++) {
> - rc = virtfn_add(dev, i, 0);
> + rc = virtfn_add(dev, i, 0, probe_vfs);
> if (rc)
> goto failed;
> }
> @@ -558,17 +559,18 @@ int pci_iov_bus_range(struct pci_bus *bus)
> * pci_enable_sriov - enable the SR-IOV capability
> * @dev: the PCI device
> * @nr_virtfn: number of virtual functions to enable
> + * @probe_vfs: in zero, don't probe new VFs, otherwise probe if suitable driver available
> *
> * Returns 0 on success, or negative on failure.
> */
> -int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn)
> +int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn, int probe_vfs)
> {
> might_sleep();
>
> if (!dev->is_physfn)
> return -ENOSYS;
>
> - return sriov_enable(dev, nr_virtfn);
> + return sriov_enable(dev, nr_virtfn, probe_vfs);
> }
> EXPORT_SYMBOL_GPL(pci_enable_sriov);
>
> diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
> index 2b3c89425bb5..d5b93339b8a4 100644
> --- a/drivers/pci/pci-driver.c
> +++ b/drivers/pci/pci-driver.c
> @@ -397,9 +397,14 @@ static int pci_device_probe(struct device *dev)
> drv = to_pci_driver(dev->driver);
> pci_dev = to_pci_dev(dev);
> pci_dev_get(pci_dev);
> - error = __pci_device_probe(drv, pci_dev);
> - if (error)
> - pci_dev_put(pci_dev);
> + if (!pci_dev->is_virtfn || pci_dev->probe_vf) {
> + error = __pci_device_probe(drv, pci_dev);
> + if (error)
> + pci_dev_put(pci_dev);
> + }
> + /* one shot blocking of probe */
> + if (pci_dev->is_virtfn && !pci_dev->probe_vf)
> + pci_dev->probe_vf = 1;
>
> return error;
> }
> diff --git a/drivers/scsi/lpfc/lpfc_init.c b/drivers/scsi/lpfc/lpfc_init.c
> index 0b2c53af85c7..2f81f471b8f3 100644
> --- a/drivers/scsi/lpfc/lpfc_init.c
> +++ b/drivers/scsi/lpfc/lpfc_init.c
> @@ -4797,7 +4797,7 @@ lpfc_sli_probe_sriov_nr_virtfn(struct lpfc_hba *phba, int nr_vfn)
> return -EINVAL;
> }
>
> - rc = pci_enable_sriov(pdev, nr_vfn);
> + rc = pci_enable_sriov(pdev, nr_vfn, 1);
> if (rc) {
> lpfc_printf_log(phba, KERN_WARNING, LOG_INIT,
> "2806 Failed to enable sriov on this device "
> diff --git a/include/linux/pci.h b/include/linux/pci.h
> index 4c8ac5fcc224..beb2640ba18d 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -373,6 +373,7 @@ struct pci_dev {
> phys_addr_t rom; /* Physical address of ROM if it's not from the BAR */
> size_t romlen; /* Length of ROM if it's not from the BAR */
> char *driver_override; /* Driver name to force a match */
> + int probe_vf; /* probe this device */
> };
>
> static inline struct pci_dev *pci_physfn(struct pci_dev *dev)
> @@ -1655,14 +1656,14 @@ int pci_ext_cfg_avail(void);
> void __iomem *pci_ioremap_bar(struct pci_dev *pdev, int bar);
>
> #ifdef CONFIG_PCI_IOV
> -int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn);
> +int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn, int probe_vfs);
> void pci_disable_sriov(struct pci_dev *dev);
> int pci_num_vf(struct pci_dev *dev);
> int pci_vfs_assigned(struct pci_dev *dev);
> int pci_sriov_set_totalvfs(struct pci_dev *dev, u16 numvfs);
> int pci_sriov_get_totalvfs(struct pci_dev *dev);
> #else
> -static inline int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn)
> +static inline int pci_enable_sriov(struct pci_dev *dev, int nr_virtfn, int nr_virt_probe)
> { return -ENODEV; }
> static inline void pci_disable_sriov(struct pci_dev *dev) { }
> static inline int pci_num_vf(struct pci_dev *dev) { return 0; }
> --
> 2.1.3
>
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