Date: Sat, 21 Jun 2025 19:48:56 +0000 From: bugzilla-noreply@freebsd.org To: net@FreeBSD.org Subject: [Bug 287492] Unable to detect NIC cards on few PCIe Gen5 slots on Dell R770 servers where x2APIC mode is enabled Message-ID: <bug-287492-7501-r4gWNIXUVJ@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-287492-7501@https.bugs.freebsd.org/bugzilla/> References: <bug-287492-7501@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D287492 John Baldwin <jhb@FreeBSD.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |kib@FreeBSD.org --- Comment #3 from John Baldwin <jhb@FreeBSD.org> --- The issue is that for this system we need to support it's I/O MMU that is u= sed to remap APIC IDs used in I/O APIC and MSI interrupts so that the interrupt message uses an APIC ID < 255, but it after it is remapped by the I/O MMU it ends up using a "real" APIC ID that can be larger. There are separate I/O MMU drivers for Intel systems (DMAR) vs AMD. 14.2 should have support for DMAR, but I believe only 15.0 has support for AMD's= I/O MMU (and I'm not fully certain if interrupt remapping is enabled by default= for AMD in 15.0). Can you confirm which CPU vendor you are using? --=20 You are receiving this mail because: You are the assignee for the bug.=
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