[dpdk-dev] [PATCH] bus/pci: optimize bus scan

[<jerinj@marvell.com>]

From: Jerin Jacob <jerinj@marvell.com>

In order to optimize the PCI management, RTE_KDRV_NONE based
device driver probing removed by not adding them to list in
the scan phase.

The legacy virtio is the only consumer of RTE_KDRV_NONE based device
driver probe scheme. The legacy virtio support will be available
through the existing VFIO/UIO based kernel driver scheme.

This patch also removes the deprecation notice for the same.

Signed-off-by: Jerin Jacob <jerinj@marvell.com>
---
 doc/guides/rel_notes/deprecation.rst |  8 --------
 drivers/bus/pci/linux/pci.c          | 25 +++----------------------
 2 files changed, 3 insertions(+), 30 deletions(-)

diff --git a/doc/guides/rel_notes/deprecation.rst b/doc/guides/rel_notes/deprecation.rst
index 0bee92425..d1034f60f 100644
--- a/doc/guides/rel_notes/deprecation.rst
+++ b/doc/guides/rel_notes/deprecation.rst
@@ -130,11 +130,3 @@ Deprecation Notices
   Python 2 support will be completely removed in 20.11.
   In 20.08, explicit deprecation warnings will be displayed when running
   scripts with Python 2.
-
-* pci: Remove ``RTE_KDRV_NONE`` based device driver probing.
-  In order to optimize the DPDK PCI enumeration management, ``RTE_KDRV_NONE``
-  based device driver probing will be removed in v20.08.
-  The legacy virtio is the only consumer of ``RTE_KDRV_NONE`` based device
-  driver probe scheme. The legacy virtio support will be available through
-  the existing VFIO/UIO based kernel driver scheme.
-  More details at https://patches.dpdk.org/patch/69351/
diff --git a/drivers/bus/pci/linux/pci.c b/drivers/bus/pci/linux/pci.c
index da2f55b3a..a2198abf4 100644
--- a/drivers/bus/pci/linux/pci.c
+++ b/drivers/bus/pci/linux/pci.c
@@ -330,9 +330,10 @@ pci_scan_one(const char *dirname, const struct rte_pci_addr *addr)
 			dev->kdrv = RTE_KDRV_UIO_GENERIC;
 		else
 			dev->kdrv = RTE_KDRV_UNKNOWN;
-	} else
+	} else {
 		dev->kdrv = RTE_KDRV_NONE;
-
+		return 0;
+	}
 	/* device is valid, add in list (sorted) */
 	if (TAILQ_EMPTY(&rte_pci_bus.device_list)) {
 		rte_pci_add_device(dev);
@@ -772,11 +773,6 @@ rte_pci_ioport_map(struct rte_pci_device *dev, int bar,
 		ret = pci_ioport_map(dev, bar, p);
 #else
 		ret = pci_uio_ioport_map(dev, bar, p);
-#endif
-		break;
-	case RTE_KDRV_NONE:
-#if defined(RTE_ARCH_X86)
-		ret = pci_ioport_map(dev, bar, p);
 #endif
 		break;
 	default:
@@ -805,11 +801,6 @@ rte_pci_ioport_read(struct rte_pci_ioport *p,
 	case RTE_KDRV_UIO_GENERIC:
 		pci_uio_ioport_read(p, data, len, offset);
 		break;
-	case RTE_KDRV_NONE:
-#if defined(RTE_ARCH_X86)
-		pci_uio_ioport_read(p, data, len, offset);
-#endif
-		break;
 	default:
 		break;
 	}
@@ -831,11 +822,6 @@ rte_pci_ioport_write(struct rte_pci_ioport *p,
 	case RTE_KDRV_UIO_GENERIC:
 		pci_uio_ioport_write(p, data, len, offset);
 		break;
-	case RTE_KDRV_NONE:
-#if defined(RTE_ARCH_X86)
-		pci_uio_ioport_write(p, data, len, offset);
-#endif
-		break;
 	default:
 		break;
 	}
@@ -861,11 +847,6 @@ rte_pci_ioport_unmap(struct rte_pci_ioport *p)
 		ret = 0;
 #else
 		ret = pci_uio_ioport_unmap(p);
-#endif
-		break;
-	case RTE_KDRV_NONE:
-#if defined(RTE_ARCH_X86)
-		ret = 0;
 #endif
 		break;
 	default:
-- 
2.26.2