From 82046b272c8e84677f46ea386f47a5fd5ddba2a0 Mon Sep 17 00:00:00 2001
From: Augustin Cavalier <waddlesplash@gmail.com>
Date: Wed, 20 Oct 2021 19:11:51 -0400
Subject: [PATCH] freebsd_network: Add pci_msix_table_bar().

Needed by the e1000 driver from FreeBSD 13. Tested in QEMU with e1000e.
---
 src/libs/compat/freebsd_network/bus.cpp        | 18 ++++++++++++++++++
 .../freebsd_network/compat/dev/pci/pcivar.h    |  2 ++
 2 files changed, 20 insertions(+)

diff --git a/src/libs/compat/freebsd_network/bus.cpp b/src/libs/compat/freebsd_network/bus.cpp
index 6b20ac644d..90e85e59c8 100644
--- a/src/libs/compat/freebsd_network/bus.cpp
+++ b/src/libs/compat/freebsd_network/bus.cpp
@@ -846,6 +846,24 @@ pci_release_msi(device_t dev)
 }
 
 
+int
+pci_msix_table_bar(device_t dev)
+{
+	pci_info *info = &((struct root_device_softc *)dev->root->softc)->pci_info;
+
+	uint8 capability_offset;
+	if (gPci->find_pci_capability(info->bus, info->device, info->function,
+			PCI_cap_id_msix, &capability_offset) != B_OK)
+		return -1;
+
+	uint32 table_value = gPci->read_pci_config(info->bus, info->device, info->function,
+		capability_offset + PCI_msix_table, 4);
+
+	uint32 bar = table_value & PCI_msix_bir_mask;
+	return PCIR_BAR(bar);
+}
+
+
 int
 pci_msix_count(device_t dev)
 {
diff --git a/src/libs/compat/freebsd_network/compat/dev/pci/pcivar.h b/src/libs/compat/freebsd_network/compat/dev/pci/pcivar.h
index 12f302e6fb..69e6ff2c35 100644
--- a/src/libs/compat/freebsd_network/compat/dev/pci/pcivar.h
+++ b/src/libs/compat/freebsd_network/compat/dev/pci/pcivar.h
@@ -51,6 +51,8 @@ int pci_find_extcap(device_t dev, int capability, int *capreg);
 int pci_msi_count(device_t dev);
 int pci_alloc_msi(device_t dev, int *count);
 int pci_release_msi(device_t dev);
+
+int pci_msix_table_bar(device_t dev);
 int pci_msix_count(device_t dev);
 int pci_alloc_msix(device_t dev, int *count);