Date: Mon, 22 Sep 2014 13:07:04 +0000 (UTC) From: Navdeep Parhar <np@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-10@freebsd.org Subject: svn commit: r271961 - in stable/10: share/man/man4 sys/dev/cxgbe Message-ID: <201409221307.s8MD74jS079794@svn.freebsd.org>
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Author: np Date: Mon Sep 22 13:07:03 2014 New Revision: 271961 URL: http://svnweb.freebsd.org/changeset/base/271961 Log: MFC r271450: cxgbe(4): knobs to enable/disable PAUSE frame based flow control. Approved by: re (glebius) Modified: stable/10/share/man/man4/cxgbe.4 stable/10/sys/dev/cxgbe/t4_main.c Directory Properties: stable/10/ (props changed) Modified: stable/10/share/man/man4/cxgbe.4 ============================================================================== --- stable/10/share/man/man4/cxgbe.4 Mon Sep 22 13:04:49 2014 (r271960) +++ stable/10/share/man/man4/cxgbe.4 Mon Sep 22 13:07:03 2014 (r271961) @@ -241,8 +241,19 @@ The default is -1 which lets the driver Controls the hardware response to congestion. -1 disables congestion feedback and is not recommended. 0 instructs the hardware to backpressure its pipeline on congestion. -This usually results in the port emitting pause frames. +This usually results in the port emitting PAUSE frames. 1 instructs the hardware to drop frames destined for congested queues. +.It Va hw.cxgbe.pause_settings +PAUSE frame settings. +Bit 0 is rx_pause, bit 1 is tx_pause. +rx_pause = 1 instructs the hardware to heed incoming PAUSE frames, 0 instructs +it to ignore them. +tx_pause = 1 allows the hardware to emit PAUSE frames when its receive FIFO +reaches a high threshold, 0 prohibits the hardware from emitting PAUSE frames. +The default is 3 (both rx_pause and tx_pause = 1). +This tunable establishes the default PAUSE settings for all ports. +Settings can be displayed and controlled on a per-port basis via the +dev.cxgbe.X.pause_settings (dev.cxl.X.pause_settings for T5 cards) sysctl. .It Va hw.cxgbe.buffer_packing Allow the hardware to deliver multiple frames in the same receive buffer opportunistically. Modified: stable/10/sys/dev/cxgbe/t4_main.c ============================================================================== --- stable/10/sys/dev/cxgbe/t4_main.c Mon Sep 22 13:04:49 2014 (r271960) +++ stable/10/sys/dev/cxgbe/t4_main.c Mon Sep 22 13:07:03 2014 (r271961) @@ -281,6 +281,15 @@ static char t4_cfg_file[32] = DEFAULT_CF TUNABLE_STR("hw.cxgbe.config_file", t4_cfg_file, sizeof(t4_cfg_file)); /* + * PAUSE settings (bit 0, 1 = rx_pause, tx_pause respectively). + * rx_pause = 1 to heed incoming PAUSE frames, 0 to ignore them. + * tx_pause = 1 to emit PAUSE frames when the rx FIFO reaches its high water + * mark or when signalled to do so, 0 to never emit PAUSE. + */ +static int t4_pause_settings = PAUSE_TX | PAUSE_RX; +TUNABLE_INT("hw.cxgbe.pause_settings", &t4_pause_settings); + +/* * Firmware auto-install by driver during attach (0, 1, 2 = prohibited, allowed, * encouraged respectively). */ @@ -393,6 +402,7 @@ static int sysctl_holdoff_tmr_idx(SYSCTL static int sysctl_holdoff_pktc_idx(SYSCTL_HANDLER_ARGS); static int sysctl_qsize_rxq(SYSCTL_HANDLER_ARGS); static int sysctl_qsize_txq(SYSCTL_HANDLER_ARGS); +static int sysctl_pause_settings(SYSCTL_HANDLER_ARGS); static int sysctl_handle_t4_reg64(SYSCTL_HANDLER_ARGS); static int sysctl_temperature(SYSCTL_HANDLER_ARGS); #ifdef SBUF_DRAIN @@ -696,6 +706,12 @@ t4_attach(device_t dev) sc->port[i] = NULL; goto done; } + + pi->link_cfg.requested_fc &= ~(PAUSE_TX | PAUSE_RX); + pi->link_cfg.requested_fc |= t4_pause_settings; + pi->link_cfg.fc &= ~(PAUSE_TX | PAUSE_RX); + pi->link_cfg.fc |= t4_pause_settings; + rc = -t4_link_start(sc, sc->mbox, pi->tx_chan, &pi->link_cfg); if (rc != 0) { device_printf(dev, "port %d l1cfg failed: %d\n", i, rc); @@ -4755,6 +4771,10 @@ cxgbe_sysctls(struct port_info *pi) CTLTYPE_INT | CTLFLAG_RW, pi, 0, sysctl_qsize_txq, "I", "tx queue size"); + SYSCTL_ADD_PROC(ctx, children, OID_AUTO, "pause_settings", + CTLTYPE_STRING | CTLFLAG_RW, pi, PAUSE_TX, sysctl_pause_settings, + "A", "PAUSE settings (bit 0 = rx_pause, bit 1 = tx_pause)"); + /* * dev.cxgbe.X.stats. */ @@ -5136,6 +5156,65 @@ sysctl_qsize_txq(SYSCTL_HANDLER_ARGS) } static int +sysctl_pause_settings(SYSCTL_HANDLER_ARGS) +{ + struct port_info *pi = arg1; + struct adapter *sc = pi->adapter; + struct link_config *lc = &pi->link_cfg; + int rc; + + if (req->newptr == NULL) { + struct sbuf *sb; + static char *bits = "\20\1PAUSE_RX\2PAUSE_TX"; + + rc = sysctl_wire_old_buffer(req, 0); + if (rc != 0) + return(rc); + + sb = sbuf_new_for_sysctl(NULL, NULL, 128, req); + if (sb == NULL) + return (ENOMEM); + + sbuf_printf(sb, "%b", lc->fc & (PAUSE_TX | PAUSE_RX), bits); + rc = sbuf_finish(sb); + sbuf_delete(sb); + } else { + char s[2]; + int n; + + s[0] = '0' + (lc->requested_fc & (PAUSE_TX | PAUSE_RX)); + s[1] = 0; + + rc = sysctl_handle_string(oidp, s, sizeof(s), req); + if (rc != 0) + return(rc); + + if (s[1] != 0) + return (EINVAL); + if (s[0] < '0' || s[0] > '9') + return (EINVAL); /* not a number */ + n = s[0] - '0'; + if (n & ~(PAUSE_TX | PAUSE_RX)) + return (EINVAL); /* some other bit is set too */ + + rc = begin_synchronized_op(sc, pi, SLEEP_OK | INTR_OK, "t4PAUSE"); + if (rc) + return (rc); + if ((lc->requested_fc & (PAUSE_TX | PAUSE_RX)) != n) { + int link_ok = lc->link_ok; + + lc->requested_fc &= ~(PAUSE_TX | PAUSE_RX); + lc->requested_fc |= n; + rc = -t4_link_start(sc, sc->mbox, pi->tx_chan, lc); + lc->link_ok = link_ok; /* restore */ + } + end_synchronized_op(sc, 0); + } + + return (rc); +} + +static int sysctl_handle_t4_reg64(SYSCTL_HANDLER_ARGS) { struct adapter *sc = arg1;
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