From owner-freebsd-net@freebsd.org Sat Jan 26 17:58:18 2019 Return-Path: Delivered-To: freebsd-net@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 17C7014A859D for ; Sat, 26 Jan 2019 17:58:18 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mailman.ysv.freebsd.org (mailman.ysv.freebsd.org [IPv6:2001:1900:2254:206a::50:5]) by mx1.freebsd.org (Postfix) with ESMTP id A773D8D6CE for ; Sat, 26 Jan 2019 17:58:17 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: by mailman.ysv.freebsd.org (Postfix) id 6A80E14A859B; Sat, 26 Jan 2019 17:58:17 +0000 (UTC) Delivered-To: net@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 591EF14A8599 for ; Sat, 26 Jan 2019 17:58:17 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mxrelay.ysv.freebsd.org (mxrelay.ysv.freebsd.org [IPv6:2001:1900:2254:206a::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) server-signature RSA-PSS (4096 bits) client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.ysv.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id ED9F28D6CB for ; Sat, 26 Jan 2019 17:58:16 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2001:1900:2254:206a::16:76]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.ysv.freebsd.org (Postfix) with ESMTPS id 27CF8D0FC for ; Sat, 26 Jan 2019 17:58:16 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org ([127.0.1.118]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id x0QHwG6J012298 for ; Sat, 26 Jan 2019 17:58:16 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id x0QHwGTA012297 for net@FreeBSD.org; Sat, 26 Jan 2019 17:58:16 GMT (envelope-from bugzilla-noreply@freebsd.org) X-Authentication-Warning: kenobi.freebsd.org: www set sender to bugzilla-noreply@freebsd.org using -f From: bugzilla-noreply@freebsd.org To: net@FreeBSD.org Subject: [Bug 230465] ixl: not working in netmap mode Date: Sat, 26 Jan 2019 17:58:14 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: 11.2-STABLE X-Bugzilla-Keywords: IntelNetworking X-Bugzilla-Severity: Affects Some People X-Bugzilla-Who: vmaffione@FreeBSD.org X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: bugs@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: freebsd-net@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Networking and TCP/IP with FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 26 Jan 2019 17:58:18 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D230465 --- Comment #7 from Vincenzo Maffione --- Hi, From the log it's quite clear that the problem is that netmap TXSYNC is reading a random value for the hw HEAD index, that is the value of the last completed TX descriptor. Now, in the driver there are two ways to get this index, depending on the v= alue of `hw.ixl.enable_head_writeback`. But the ixl driver seems to be aware of = this difference and prevent the use of netmap if this is not possible. So I don't quite understand why this is not working. What is the value of `sysctl hw.ixl.enable_head_writeback` in your setup ? Also, what does `dmesg | grep "netmap queues"` say ? In any case, this is affecting 11.x because it does not use iflib yet. >From 12.x on iflib is used, and netmap support is provided through iflib, w= hich means that netmap works on ixl iff regular network stack works in ixl. --=20 You are receiving this mail because: You are on the CC list for the bug.=