be2net: implement .sriov_configure() PCI callback

This patch implements the .sriov_configure() PCI method to allow for
runtime enabling/disabling of VFs. The module param "num_vfs" is now
deprecated.
At the time of driver load the PF-pool resources are allocated to the PF.
When the user enables VFs, the resources are then re-distributed across
PFs and VFs based on the number of VFs enabled.
Signed-off-by: Vasundhara Volam <vasundhara.volam@emulex.com>
Signed-off-by: Sathya Perla <sathya.perla@emulex.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/emulex/benet/be_cmds.c b/drivers/net/ethernet/emulex/benet/be_cmds.c
index 1c0e2b00db8d60807cd580f3f2f9952103aae504..75cb4610423bf14cafc6cb437c3477be14e060ce 100644 (file)
--- a/drivers/net/ethernet/emulex/benet/be_cmds.c
+++ b/drivers/net/ethernet/emulex/benet/be_cmds.c
@@ -3879,9 +3879,6 @@ int be_cmd_set_sriov_config(struct be_adapter *adapter,
                struct be_nic_res_desc nic_vft;
        } __packed desc;
 
-       if (BEx_chip(adapter) || lancer_chip(adapter))
-               return 0;
-
        /* PF PCIE descriptor */
        be_reset_pcie_desc(&desc.pcie);
        desc.pcie.hdr.desc_type = PCIE_RESOURCE_DESC_TYPE_V1;

diff --git a/drivers/net/ethernet/emulex/benet/be_main.c b/drivers/net/ethernet/emulex/benet/be_main.c
index 20305e1e0ec4955e923faeb8f7a38bd36c4491d4..5652b005947fcf444bf7a8d1926e0100c0fac184 100644 (file)
--- a/drivers/net/ethernet/emulex/benet/be_main.c
+++ b/drivers/net/ethernet/emulex/benet/be_main.c
@@ -30,6 +30,9 @@ MODULE_DESCRIPTION(DRV_DESC " " DRV_VER);
 MODULE_AUTHOR("Emulex Corporation");
 MODULE_LICENSE("GPL");
 
+/* num_vfs module param is obsolete.
+ * Use sysfs method to enable/disable VFs.
+ */
 static unsigned int num_vfs;
 module_param(num_vfs, uint, S_IRUGO);
 MODULE_PARM_DESC(num_vfs, "Number of PCI VFs to initialize");
@@ -3449,7 +3452,8 @@ static int be_clear(struct be_adapter *adapter)
        /* Re-configure FW to distribute resources evenly across max-supported
         * number of VFs, only when VFs are not already enabled.
         */
-       if (be_physfn(adapter) && !pci_vfs_assigned(pdev)) {
+       if (skyhawk_chip(adapter) && be_physfn(adapter) &&
+           !pci_vfs_assigned(pdev)) {
                num_vf_qs = be_calculate_vf_qs(adapter,
                                               pci_sriov_get_totalvfs(pdev));
                be_cmd_set_sriov_config(adapter, adapter->pool_res,
@@ -3712,13 +3716,12 @@ static void be_setup_init(struct be_adapter *adapter)
 
 static int be_get_sriov_config(struct be_adapter *adapter)
 {
-       struct device *dev = &adapter->pdev->dev;
        struct be_resources res = {0};
        int max_vfs, old_vfs;
 
-       /* Some old versions of BE3 FW don't report max_vfs value */
        be_cmd_get_profile_config(adapter, &res, RESOURCE_LIMITS, 0);
 
+       /* Some old versions of BE3 FW don't report max_vfs value */
        if (BE3_chip(adapter) && !res.max_vfs) {
                max_vfs = pci_sriov_get_totalvfs(adapter->pdev);
                res.max_vfs = max_vfs > 0 ? min(MAX_VFS, max_vfs) : 0;
@@ -3726,35 +3729,49 @@ static int be_get_sriov_config(struct be_adapter *adapter)
 
        adapter->pool_res = res;
 
-       if (!be_max_vfs(adapter)) {
-               if (num_vfs)
-                       dev_warn(dev, "SRIOV is disabled. Ignoring num_vfs\n");
-               adapter->num_vfs = 0;
-               return 0;
-       }
-
-       pci_sriov_set_totalvfs(adapter->pdev, be_max_vfs(adapter));
-
-       /* validate num_vfs module param */
+       /* If during previous unload of the driver, the VFs were not disabled,
+        * then we cannot rely on the PF POOL limits for the TotalVFs value.
+        * Instead use the TotalVFs value stored in the pci-dev struct.
+        */
        old_vfs = pci_num_vf(adapter->pdev);
        if (old_vfs) {
-               dev_info(dev, "%d VFs are already enabled\n", old_vfs);
-               if (old_vfs != num_vfs)
-                       dev_warn(dev, "Ignoring num_vfs=%d setting\n", num_vfs);
+               dev_info(&adapter->pdev->dev, "%d VFs are already enabled\n",
+                        old_vfs);
+
+               adapter->pool_res.max_vfs =
+                       pci_sriov_get_totalvfs(adapter->pdev);
                adapter->num_vfs = old_vfs;
-       } else {
-               if (num_vfs > be_max_vfs(adapter)) {
-                       dev_info(dev, "Resources unavailable to init %d VFs\n",
-                                num_vfs);
-                       dev_info(dev, "Limiting to %d VFs\n",
-                                be_max_vfs(adapter));
-               }
-               adapter->num_vfs = min_t(u16, num_vfs, be_max_vfs(adapter));
        }
 
        return 0;
 }
 
+static void be_alloc_sriov_res(struct be_adapter *adapter)
+{
+       int old_vfs = pci_num_vf(adapter->pdev);
+       u16 num_vf_qs;
+       int status;
+
+       be_get_sriov_config(adapter);
+
+       if (!old_vfs)
+               pci_sriov_set_totalvfs(adapter->pdev, be_max_vfs(adapter));
+
+       /* When the HW is in SRIOV capable configuration, the PF-pool
+        * resources are given to PF during driver load, if there are no
+        * old VFs. This facility is not available in BE3 FW.
+        * Also, this is done by FW in Lancer chip.
+        */
+       if (skyhawk_chip(adapter) && be_max_vfs(adapter) && !old_vfs) {
+               num_vf_qs = be_calculate_vf_qs(adapter, 0);
+               status = be_cmd_set_sriov_config(adapter, adapter->pool_res, 0,
+                                                num_vf_qs);
+               if (status)
+                       dev_err(&adapter->pdev->dev,
+                               "Failed to optimize SRIOV resources\n");
+       }
+}
+
 static int be_get_resources(struct be_adapter *adapter)
 {
        struct device *dev = &adapter->pdev->dev;
@@ -3800,40 +3817,12 @@ static int be_get_resources(struct be_adapter *adapter)
                 be_max_uc(adapter), be_max_mc(adapter),
                 be_max_vlans(adapter));
 
+       /* Sanitize cfg_num_qs based on HW and platform limits */
+       adapter->cfg_num_qs = min_t(u16, netif_get_num_default_rss_queues(),
+                                   be_max_qs(adapter));
        return 0;
 }
 
-static void be_sriov_config(struct be_adapter *adapter)
-{
-       struct device *dev = &adapter->pdev->dev;
-       u16 num_vf_qs;
-       int status;
-
-       status = be_get_sriov_config(adapter);
-       if (status) {
-               dev_err(dev, "Failed to query SR-IOV configuration\n");
-               dev_err(dev, "SR-IOV cannot be enabled\n");
-               return;
-       }
-
-       /* When the HW is in SRIOV capable configuration, the PF-pool
-        * resources are equally distributed across the max-number of
-        * VFs. The user may request only a subset of the max-vfs to be
-        * enabled. Based on num_vfs, redistribute the resources across
-        * num_vfs so that each VF will have access to more number of
-        * resources. This facility is not available in BE3 FW.
-        * Also, this is done by FW in Lancer chip.
-        */
-       if (be_max_vfs(adapter) && !pci_num_vf(adapter->pdev)) {
-               num_vf_qs = be_calculate_vf_qs(adapter, adapter->num_vfs);
-               status = be_cmd_set_sriov_config(adapter,
-                                                adapter->pool_res,
-                                                adapter->num_vfs, num_vf_qs);
-               if (status)
-                       dev_err(dev, "Failed to optimize SR-IOV resources\n");
-       }
-}
-
 static int be_get_config(struct be_adapter *adapter)
 {
        int status, level;
@@ -3864,9 +3853,6 @@ static int be_get_config(struct be_adapter *adapter)
                                 "Using profile 0x%x\n", profile_id);
        }
 
-       if (!BE2_chip(adapter) && be_physfn(adapter))
-               be_sriov_config(adapter);
-
        status = be_get_resources(adapter);
        if (status)
                return status;
@@ -3876,9 +3862,6 @@ static int be_get_config(struct be_adapter *adapter)
        if (!adapter->pmac_id)
                return -ENOMEM;
 
-       /* Sanitize cfg_num_qs based on HW and platform limits */
-       adapter->cfg_num_qs = min(adapter->cfg_num_qs, be_max_qs(adapter));
-
        return 0;
 }
 
@@ -4053,6 +4036,9 @@ static int be_setup(struct be_adapter *adapter)
        if (!lancer_chip(adapter))
                be_cmd_req_native_mode(adapter);
 
+       if (!BE2_chip(adapter) && be_physfn(adapter))
+               be_alloc_sriov_res(adapter);
+
        status = be_get_config(adapter);
        if (status)
                goto err;
@@ -5274,7 +5260,6 @@ static int be_drv_init(struct be_adapter *adapter)
 
        /* Must be a power of 2 or else MODULO will BUG_ON */
        adapter->be_get_temp_freq = 64;
-       adapter->cfg_num_qs = netif_get_num_default_rss_queues();
 
        return 0;
 
@@ -5598,6 +5583,60 @@ err:
        dev_err(&adapter->pdev->dev, "EEH resume failed\n");
 }
 
+static int be_pci_sriov_configure(struct pci_dev *pdev, int num_vfs)
+{
+       struct be_adapter *adapter = pci_get_drvdata(pdev);
+       u16 num_vf_qs;
+       int status;
+
+       if (!num_vfs)
+               be_vf_clear(adapter);
+
+       adapter->num_vfs = num_vfs;
+
+       if (adapter->num_vfs == 0 && pci_vfs_assigned(pdev)) {
+               dev_warn(&pdev->dev,
+                        "Cannot disable VFs while they are assigned\n");
+               return -EBUSY;
+       }
+
+       /* When the HW is in SRIOV capable configuration, the PF-pool resources
+        * are equally distributed across the max-number of VFs. The user may
+        * request only a subset of the max-vfs to be enabled.
+        * Based on num_vfs, redistribute the resources across num_vfs so that
+        * each VF will have access to more number of resources.
+        * This facility is not available in BE3 FW.
+        * Also, this is done by FW in Lancer chip.
+        */
+       if (skyhawk_chip(adapter) && !pci_num_vf(pdev)) {
+               num_vf_qs = be_calculate_vf_qs(adapter, adapter->num_vfs);
+               status = be_cmd_set_sriov_config(adapter, adapter->pool_res,
+                                                adapter->num_vfs, num_vf_qs);
+               if (status)
+                       dev_err(&pdev->dev,
+                               "Failed to optimize SR-IOV resources\n");
+       }
+
+       status = be_get_resources(adapter);
+       if (status)
+               return be_cmd_status(status);
+
+       /* Updating real_num_tx/rx_queues() requires rtnl_lock() */
+       rtnl_lock();
+       status = be_update_queues(adapter);
+       rtnl_unlock();
+       if (status)
+               return be_cmd_status(status);
+
+       if (adapter->num_vfs)
+               status = be_vf_setup(adapter);
+
+       if (!status)
+               return adapter->num_vfs;
+
+       return 0;
+}
+
 static const struct pci_error_handlers be_eeh_handlers = {
        .error_detected = be_eeh_err_detected,
        .slot_reset = be_eeh_reset,
@@ -5612,6 +5651,7 @@ static struct pci_driver be_driver = {
        .suspend = be_suspend,
        .resume = be_pci_resume,
        .shutdown = be_shutdown,
+       .sriov_configure = be_pci_sriov_configure,
        .err_handler = &be_eeh_handlers
 };
 
@@ -5625,6 +5665,11 @@ static int __init be_init_module(void)
                rx_frag_size = 2048;
        }
 
+       if (num_vfs > 0) {
+               pr_info(DRV_NAME " : Module param num_vfs is obsolete.");
+               pr_info(DRV_NAME " : Use sysfs method to enable VFs\n");
+       }
+
        return pci_register_driver(&be_driver);
 }
 module_init(be_init_module);