From owner-svn-src-head@freebsd.org Mon Oct 22 23:06:24 2018 Return-Path: Delivered-To: svn-src-head@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 ADF60FE8291; Mon, 22 Oct 2018 23:06:24 +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 TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 63CA2787FB; Mon, 22 Oct 2018 23:06:24 +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 5E6C726F0B; Mon, 22 Oct 2018 23:06:24 +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 w9MN6OvM080383; Mon, 22 Oct 2018 23:06:24 GMT (envelope-from np@FreeBSD.org) Received: (from np@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id w9MN6Oiu080382; Mon, 22 Oct 2018 23:06:24 GMT (envelope-from np@FreeBSD.org) Message-Id: <201810222306.w9MN6Oiu080382@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: np set sender to np@FreeBSD.org using -f From: Navdeep Parhar Date: Mon, 22 Oct 2018 23:06:24 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r339626 - head/sys/dev/cxgbe X-SVN-Group: head X-SVN-Commit-Author: np X-SVN-Commit-Paths: head/sys/dev/cxgbe X-SVN-Commit-Revision: 339626 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 22 Oct 2018 23:06:24 -0000 Author: np Date: Mon Oct 22 23:06:23 2018 New Revision: 339626 URL: https://svnweb.freebsd.org/changeset/base/339626 Log: cxgbe(4): Use automatic cidx updates with ofld and ctrl queues. The bits that explicitly request cidx updates do not work reliably with all possible WRs that can be sent over the queue. The F_FW_WR_EQUIQ requests that still remain may also have to be replaced with explicit credit flush WRs in the future. MFC after: 2 days Sponsored by: Chelsio Communications Modified: head/sys/dev/cxgbe/t4_sge.c Modified: head/sys/dev/cxgbe/t4_sge.c ============================================================================== --- head/sys/dev/cxgbe/t4_sge.c Mon Oct 22 22:24:32 2018 (r339625) +++ head/sys/dev/cxgbe/t4_sge.c Mon Oct 22 23:06:23 2018 (r339626) @@ -2089,12 +2089,13 @@ drain_wrq_wr_list(struct adapter *sc, struct sge_wrq * if (available < eq->sidx / 4 && atomic_cmpset_int(&eq->equiq, 0, 1)) { + /* + * XXX: This is not 100% reliable with some + * types of WRs. But this is a very unusual + * situation for an ofld/ctrl queue anyway. + */ dst->equiq_to_len16 |= htobe32(F_FW_WR_EQUIQ | F_FW_WR_EQUEQ); - eq->equeqidx = eq->pidx; - } else if (IDXDIFF(eq->pidx, eq->equeqidx, eq->sidx) >= 32) { - dst->equiq_to_len16 |= htobe32(F_FW_WR_EQUEQ); - eq->equeqidx = eq->pidx; } dbdiff += n; @@ -2644,12 +2645,13 @@ commit_wrq_wr(struct sge_wrq *wrq, void *w, struct wrq available = IDXDIFF(eq->cidx, eq->pidx, eq->sidx) - 1; if (available < eq->sidx / 4 && atomic_cmpset_int(&eq->equiq, 0, 1)) { + /* + * XXX: This is not 100% reliable with some + * types of WRs. But this is a very unusual + * situation for an ofld/ctrl queue anyway. + */ dst->equiq_to_len16 |= htobe32(F_FW_WR_EQUIQ | F_FW_WR_EQUEQ); - eq->equeqidx = pidx; - } else if (IDXDIFF(eq->pidx, eq->equeqidx, eq->sidx) >= 32) { - dst->equiq_to_len16 |= htobe32(F_FW_WR_EQUEQ); - eq->equeqidx = pidx; } ring_eq_db(wrq->adapter, eq, ndesc); @@ -3584,6 +3586,23 @@ free_nm_txq(struct vi_info *vi, struct sge_nm_txq *nm_ } #endif +/* + * Returns a reasonable automatic cidx flush threshold for a given queue size. + */ +static u_int +qsize_to_fthresh(int qsize) +{ + u_int fthresh; + + while (!powerof2(qsize)) + qsize++; + fthresh = ilog2(qsize); + if (fthresh > X_CIDXFLUSHTHRESH_128) + fthresh = X_CIDXFLUSHTHRESH_128; + + return (fthresh); +} + static int ctrl_eq_alloc(struct adapter *sc, struct sge_eq *eq) { @@ -3607,7 +3626,7 @@ ctrl_eq_alloc(struct adapter *sc, struct sge_eq *eq) c.dcaen_to_eqsize = htobe32(V_FW_EQ_CTRL_CMD_FBMIN(X_FETCHBURSTMIN_64B) | V_FW_EQ_CTRL_CMD_FBMAX(X_FETCHBURSTMAX_512B) | - V_FW_EQ_CTRL_CMD_CIDXFTHRESH(X_CIDXFLUSHTHRESH_32) | + V_FW_EQ_CTRL_CMD_CIDXFTHRESH(qsize_to_fthresh(qsize)) | V_FW_EQ_CTRL_CMD_EQSIZE(qsize)); c.eqaddr = htobe64(eq->ba); @@ -3689,12 +3708,13 @@ ofld_eq_alloc(struct adapter *sc, struct vi_info *vi, c.alloc_to_len16 = htonl(F_FW_EQ_OFLD_CMD_ALLOC | F_FW_EQ_OFLD_CMD_EQSTART | FW_LEN16(c)); c.fetchszm_to_iqid = - htonl(V_FW_EQ_OFLD_CMD_HOSTFCMODE(X_HOSTFCMODE_NONE) | + htonl(V_FW_EQ_OFLD_CMD_HOSTFCMODE(X_HOSTFCMODE_STATUS_PAGE) | V_FW_EQ_OFLD_CMD_PCIECHN(eq->tx_chan) | F_FW_EQ_OFLD_CMD_FETCHRO | V_FW_EQ_OFLD_CMD_IQID(eq->iqid)); c.dcaen_to_eqsize = htobe32(V_FW_EQ_OFLD_CMD_FBMIN(X_FETCHBURSTMIN_64B) | V_FW_EQ_OFLD_CMD_FBMAX(X_FETCHBURSTMAX_512B) | + V_FW_EQ_OFLD_CMD_CIDXFTHRESH(qsize_to_fthresh(qsize)) | V_FW_EQ_OFLD_CMD_EQSIZE(qsize)); c.eqaddr = htobe64(eq->ba); @@ -3732,8 +3752,9 @@ alloc_eq(struct adapter *sc, struct vi_info *vi, struc if (rc) return (rc); - eq->pidx = eq->cidx = 0; - eq->equeqidx = eq->dbidx = 0; + eq->pidx = eq->cidx = eq->dbidx = 0; + /* Note that equeqidx is not used with sge_wrq (OFLD/CTRL) queues. */ + eq->equeqidx = 0; eq->doorbells = sc->doorbells; switch (eq->flags & EQ_TYPEMASK) {