netdev - [PATCH net-next 1/2] liquidio: with embedded f/w, don't reload f/w, issue pf flr at exit

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Date:   Thu, 17 Aug 2017 23:11:25 -0700
From:   Felix Manlunas <felix.manlunas@...ium.com>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org, raghu.vatsavayi@...ium.com,
        derek.chickles@...ium.com, satananda.burla@...ium.com,
        ricardo.farrington@...ium.com
Subject: [PATCH net-next 1/2] liquidio: with embedded f/w, don't reload f/w,
 issue pf flr at exit

From: Rick Farrington <ricardo.farrington@...ium.com>

1. Add support for PF FLR when exiting
   (enables CORE_DRV_ACTIVE upon next driver init)
2. Skip some initialization (don't try to load f/w, activate consoles).

Signed-off-by: Rick Farrington <ricardo.farrington@...ium.com>
Signed-off-by: Felix Manlunas <felix.manlunas@...ium.com>
---
 drivers/net/ethernet/cavium/liquidio/lio_main.c | 70 ++++++++++++++++---------
 1 file changed, 46 insertions(+), 24 deletions(-)

diff --git a/drivers/net/ethernet/cavium/liquidio/lio_main.c b/drivers/net/ethernet/cavium/liquidio/lio_main.c
index db85f8f..dccd447 100644
--- a/drivers/net/ethernet/cavium/liquidio/lio_main.c
+++ b/drivers/net/ethernet/cavium/liquidio/lio_main.c
@@ -1122,6 +1122,33 @@ static bool fw_type_is_none(void)
 }
 
 /**
+ * \brief PCI FLR for each Octeon device.
+ * @param oct octeon device
+ */
+static void octeon_pci_flr(struct octeon_device *oct)
+{
+	int rc;
+
+	pci_save_state(oct->pci_dev);
+
+	pci_cfg_access_lock(oct->pci_dev);
+
+	/* Quiesce the device completely */
+	pci_write_config_word(oct->pci_dev, PCI_COMMAND,
+			      PCI_COMMAND_INTX_DISABLE);
+
+	rc = __pci_reset_function_locked(oct->pci_dev);
+
+	if (rc != 0)
+		dev_err(&oct->pci_dev->dev, "Error %d resetting PCI function %d\n",
+			rc, oct->pf_num);
+
+	pci_cfg_access_unlock(oct->pci_dev);
+
+	pci_restore_state(oct->pci_dev);
+}
+
+/**
  *\brief Destroy resources associated with octeon device
  * @param pdev PCI device structure
  * @param ent unused
@@ -1269,14 +1296,16 @@ static void octeon_destroy_resources(struct octeon_device *oct)
 	case OCT_DEV_PCI_MAP_DONE:
 		refcount = octeon_deregister_device(oct);
 
-		if (!fw_type_is_none()) {
-			/* Soft reset the octeon device before exiting.
-			 * Implementation note: here, we reset the device
-			 * if it is a CN6XXX OR the last CN23XX device.
-			 */
-			if (OCTEON_CN6XXX(oct) || !refcount)
-				oct->fn_list.soft_reset(oct);
-		}
+		/* Soft reset the octeon device before exiting.
+		 * However, if fw was loaded from card (i.e. autoboot),
+		 * perform an FLR instead.
+		 * Implementation note: only soft-reset the device
+		 * if it is a CN6XXX OR the LAST CN23XX device.
+		 */
+		if (fw_type_is_none())
+			octeon_pci_flr(oct);
+		else if (OCTEON_CN6XXX(oct) || !refcount)
+			oct->fn_list.soft_reset(oct);
 
 		octeon_unmap_pci_barx(oct, 0);
 		octeon_unmap_pci_barx(oct, 1);
@@ -1903,11 +1932,6 @@ static int load_firmware(struct octeon_device *oct)
 	char fw_name[LIO_MAX_FW_FILENAME_LEN];
 	char *tmp_fw_type;
 
-	if (fw_type_is_none()) {
-		dev_info(&oct->pci_dev->dev, "Skipping firmware load\n");
-		return ret;
-	}
-
 	if (fw_type[0] == '\0')
 		tmp_fw_type = LIO_FW_NAME_TYPE_NIC;
 	else
@@ -3891,18 +3915,16 @@ static int octeon_device_init(struct octeon_device *octeon_dev)
 	octeon_dev->app_mode = CVM_DRV_INVALID_APP;
 
 	if (OCTEON_CN23XX_PF(octeon_dev)) {
-		if (!cn23xx_fw_loaded(octeon_dev)) {
+		if (!cn23xx_fw_loaded(octeon_dev) && !fw_type_is_none()) {
 			fw_loaded = 0;
-			if (!fw_type_is_none()) {
-				/* Do a soft reset of the Octeon device. */
-				if (octeon_dev->fn_list.soft_reset(octeon_dev))
-					return 1;
-				/* things might have changed */
-				if (!cn23xx_fw_loaded(octeon_dev))
-					fw_loaded = 0;
-				else
-					fw_loaded = 1;
-			}
+			/* Do a soft reset of the Octeon device. */
+			if (octeon_dev->fn_list.soft_reset(octeon_dev))
+				return 1;
+			/* things might have changed */
+			if (!cn23xx_fw_loaded(octeon_dev))
+				fw_loaded = 0;
+			else
+				fw_loaded = 1;
 		} else {
 			fw_loaded = 1;
 		}
-- 
2.9.0