From owner-svn-src-stable-12@freebsd.org Mon Oct 5 18:49:55 2020 Return-Path: Delivered-To: svn-src-stable-12@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id EAC9042CD6D; Mon, 5 Oct 2020 18:49:55 +0000 (UTC) (envelope-from np@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4C4qQq5wxqz4LvF; Mon, 5 Oct 2020 18:49:55 +0000 (UTC) (envelope-from np@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id AEF6C1A037; Mon, 5 Oct 2020 18:49:55 +0000 (UTC) (envelope-from np@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id 095Intld018112; Mon, 5 Oct 2020 18:49:55 GMT (envelope-from np@FreeBSD.org) Received: (from np@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id 095IntW9018109; Mon, 5 Oct 2020 18:49:55 GMT (envelope-from np@FreeBSD.org) Message-Id: <202010051849.095IntW9018109@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: np set sender to np@FreeBSD.org using -f From: Navdeep Parhar Date: Mon, 5 Oct 2020 18:49:55 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-12@freebsd.org Subject: svn commit: r366458 - stable/12/sys/dev/cxgbe X-SVN-Group: stable-12 X-SVN-Commit-Author: np X-SVN-Commit-Paths: stable/12/sys/dev/cxgbe X-SVN-Commit-Revision: 366458 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-stable-12@freebsd.org X-Mailman-Version: 2.1.33 Precedence: list List-Id: SVN commit messages for only the 12-stable src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 05 Oct 2020 18:49:56 -0000 Author: np Date: Mon Oct 5 18:49:55 2020 New Revision: 366458 URL: https://svnweb.freebsd.org/changeset/base/366458 Log: MFC r366245: cxgbe(4): adjust the doorbell threshold for netmap freelists to match the maximum burst size used when fetching descriptors from the list. Sponsored by: Chelsio Communications Modified: stable/12/sys/dev/cxgbe/adapter.h stable/12/sys/dev/cxgbe/t4_netmap.c Directory Properties: stable/12/ (props changed) Modified: stable/12/sys/dev/cxgbe/adapter.h ============================================================================== --- stable/12/sys/dev/cxgbe/adapter.h Mon Oct 5 18:47:12 2020 (r366457) +++ stable/12/sys/dev/cxgbe/adapter.h Mon Oct 5 18:49:55 2020 (r366458) @@ -716,6 +716,7 @@ struct sge_nm_rxq { uint32_t fl_sidx2; /* copy of fl_sidx */ uint32_t fl_db_val; u_int fl_db_saved; + u_int fl_db_threshold; /* in descriptors */ u_int fl_hwidx:4; /* Modified: stable/12/sys/dev/cxgbe/t4_netmap.c ============================================================================== --- stable/12/sys/dev/cxgbe/t4_netmap.c Mon Oct 5 18:47:12 2020 (r366457) +++ stable/12/sys/dev/cxgbe/t4_netmap.c Mon Oct 5 18:49:55 2020 (r366458) @@ -196,6 +196,9 @@ alloc_nm_rxq_hwq(struct vi_info *vi, struct sge_nm_rxq nm_rxq->fl_cntxt_id = be16toh(c.fl0id); nm_rxq->fl_pidx = nm_rxq->fl_cidx = 0; + nm_rxq->fl_db_saved = 0; + /* matches the X_FETCHBURSTMAX_512B or X_FETCHBURSTMAX_256B above. */ + nm_rxq->fl_db_threshold = chip_id(sc) <= CHELSIO_T5 ? 8 : 4; MPASS(nm_rxq->fl_sidx == na->num_rx_desc); cntxt_id = nm_rxq->fl_cntxt_id - sc->sge.eq_start; if (cntxt_id >= sc->sge.neq) { @@ -1063,7 +1066,7 @@ cxgbe_netmap_rxsync(struct netmap_kring *kring, int fl fl_pidx = 0; slot = &ring->slot[0]; } - if (++dbinc == 8 && n >= 32) { + if (++dbinc == nm_rxq->fl_db_threshold) { wmb(); if (starve_fl) nm_rxq->fl_db_saved += dbinc;