From owner-svn-src-head@freebsd.org Tue Jul 28 07:30:08 2015 Return-Path: Delivered-To: svn-src-head@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id E2EF99AB6C2; Tue, 28 Jul 2015 07:30:08 +0000 (UTC) (envelope-from hselasky@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2001:1900:2254:2068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id C724F9B2; Tue, 28 Jul 2015 07:30:08 +0000 (UTC) (envelope-from hselasky@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.70]) by repo.freebsd.org (8.14.9/8.14.9) with ESMTP id t6S7U8eL069700; Tue, 28 Jul 2015 07:30:08 GMT (envelope-from hselasky@FreeBSD.org) Received: (from hselasky@localhost) by repo.freebsd.org (8.14.9/8.14.9/Submit) id t6S7U8eS069698; Tue, 28 Jul 2015 07:30:08 GMT (envelope-from hselasky@FreeBSD.org) Message-Id: <201507280730.t6S7U8eS069698@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: hselasky set sender to hselasky@FreeBSD.org using -f From: Hans Petter Selasky Date: Tue, 28 Jul 2015 07:30:08 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r285935 - head/sys/dev/usb/controller X-SVN-Group: head 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: 2.1.20 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: Tue, 28 Jul 2015 07:30:09 -0000 Author: hselasky Date: Tue Jul 28 07:30:07 2015 New Revision: 285935 URL: https://svnweb.freebsd.org/changeset/base/285935 Log: Optimise the DWC OTG host mode driver's receive path: Remove NAKing limit and pause IN and OUT transactions for 125us in case of NAK response for BULK and CONTROL endpoints. This gets the receive latency down and improves USB network throughput at the cost of some CPU usage. MFC after: 1 month Modified: head/sys/dev/usb/controller/dwc_otg.c head/sys/dev/usb/controller/dwc_otg.h Modified: head/sys/dev/usb/controller/dwc_otg.c ============================================================================== --- head/sys/dev/usb/controller/dwc_otg.c Tue Jul 28 07:04:51 2015 (r285934) +++ head/sys/dev/usb/controller/dwc_otg.c Tue Jul 28 07:30:07 2015 (r285935) @@ -453,8 +453,12 @@ static void dwc_otg_enable_sof_irq(struct dwc_otg_softc *sc) { /* In device mode we don't use the SOF interrupt */ - if (sc->sc_flags.status_device_mode != 0 || - (sc->sc_irq_mask & GINTMSK_SOFMSK) != 0) + if (sc->sc_flags.status_device_mode != 0) + return; + /* Ensure the SOF interrupt is not disabled */ + sc->sc_needsof = 1; + /* Check if the SOF interrupt is already enabled */ + if ((sc->sc_irq_mask & GINTMSK_SOFMSK) != 0) return; sc->sc_irq_mask |= GINTMSK_SOFMSK; DWC_OTG_WRITE_4(sc, DOTG_GINTMSK, sc->sc_irq_mask); @@ -775,7 +779,7 @@ check_state: case DWC_CHAN_ST_WAIT_ANE: if (hcint & (HCINT_RETRY | HCINT_ERRORS)) { - td->did_nak++; + td->did_nak = 1; td->tt_scheduled = 0; goto send_pkt; } else if (hcint & (HCINT_ACK | HCINT_NYET)) { @@ -789,7 +793,7 @@ check_state: case DWC_CHAN_ST_WAIT_S_ANE: if (hcint & (HCINT_RETRY | HCINT_ERRORS)) { - td->did_nak++; + td->did_nak = 1; td->tt_scheduled = 0; goto send_pkt; } else if (hcint & (HCINT_ACK | HCINT_NYET)) { @@ -801,7 +805,7 @@ check_state: if (hcint & HCINT_NYET) { goto send_cpkt; } else if (hcint & (HCINT_RETRY | HCINT_ERRORS)) { - td->did_nak++; + td->did_nak = 1; td->tt_scheduled = 0; goto send_pkt; } else if (hcint & HCINT_ACK) { @@ -1069,8 +1073,17 @@ dwc_otg_host_rate_check(struct dwc_otg_s if (!td->tt_scheduled) goto busy; td->tt_scheduled = 0; - } else if (td->did_nak >= DWC_OTG_NAK_MAX) { - goto busy; + } else if (td->did_nak != 0) { + uint8_t frame_num = (uint8_t)sc->sc_last_frame_num; + /* check if we should pause sending queries for 125us */ + if (td->tmr_res == frame_num) { + /* wait a bit */ + dwc_otg_enable_sof_irq(sc); + goto busy; + } + /* query for data one more time */ + td->tmr_res = frame_num; + td->did_nak = 0; } else if (td->set_toggle) { td->set_toggle = 0; td->toggle = 1; @@ -1257,7 +1270,7 @@ dwc_otg_host_data_rx(struct dwc_otg_soft goto receive_pkt; } } - td->did_nak++; + td->did_nak = 1; td->tt_scheduled = 0; if (td->hcsplt != 0) goto receive_spkt; @@ -1312,7 +1325,7 @@ dwc_otg_host_data_rx(struct dwc_otg_soft * case of interrupt and isochronous transfers: */ if (hcint & (HCINT_RETRY | HCINT_ERRORS)) { - td->did_nak++; + td->did_nak = 1; td->tt_scheduled = 0; goto receive_spkt; } else if (hcint & HCINT_NYET) { @@ -1638,7 +1651,7 @@ dwc_otg_host_data_tx(struct dwc_otg_soft case DWC_CHAN_ST_WAIT_ANE: if (hcint & (HCINT_RETRY | HCINT_ERRORS)) { - td->did_nak++; + td->did_nak = 1; td->tt_scheduled = 0; goto send_pkt; } else if (hcint & (HCINT_ACK | HCINT_NYET)) { @@ -1664,7 +1677,7 @@ dwc_otg_host_data_tx(struct dwc_otg_soft case DWC_CHAN_ST_WAIT_S_ANE: if (hcint & (HCINT_RETRY | HCINT_ERRORS)) { - td->did_nak++; + td->did_nak = 1; td->tt_scheduled = 0; goto send_pkt; } else if (hcint & (HCINT_ACK | HCINT_NYET)) { @@ -1677,7 +1690,7 @@ dwc_otg_host_data_tx(struct dwc_otg_soft if (hcint & HCINT_NYET) { goto send_cpkt; } else if (hcint & (HCINT_RETRY | HCINT_ERRORS)) { - td->did_nak++; + td->did_nak = 1; td->tt_scheduled = 0; goto send_pkt; } else if (hcint & HCINT_ACK) { @@ -2280,8 +2293,6 @@ static void dwc_otg_timer(void *_sc) { struct dwc_otg_softc *sc = _sc; - struct usb_xfer *xfer; - struct dwc_otg_td *td; USB_BUS_LOCK_ASSERT(&sc->sc_bus, MA_OWNED); @@ -2292,14 +2303,6 @@ dwc_otg_timer(void *_sc) /* increment timer value */ sc->sc_tmr_val++; - TAILQ_FOREACH(xfer, &sc->sc_bus.intr_q.head, wait_entry) { - td = xfer->td_transfer_cache; - if (td != NULL) { - /* reset NAK counter */ - td->did_nak = 0; - } - } - /* enable SOF interrupt, which will poll jobs */ dwc_otg_enable_sof_irq(sc); @@ -2459,8 +2462,7 @@ dwc_otg_update_host_transfer_schedule_lo TAILQ_FOREACH_SAFE(xfer, &sc->sc_bus.intr_q.head, wait_entry, xfer_next) { td = xfer->td_transfer_cache; if (td == NULL || - td->ep_type != UE_CONTROL || - td->did_nak >= DWC_OTG_NAK_MAX) { + td->ep_type != UE_CONTROL) { continue; } @@ -2480,8 +2482,7 @@ dwc_otg_update_host_transfer_schedule_lo TAILQ_FOREACH_SAFE(xfer, &sc->sc_bus.intr_q.head, wait_entry, xfer_next) { td = xfer->td_transfer_cache; if (td == NULL || - td->ep_type != UE_BULK || - td->did_nak >= DWC_OTG_NAK_MAX) { + td->ep_type != UE_BULK) { continue; } @@ -3244,7 +3245,7 @@ dwc_otg_setup_standard_chain(struct usb_ td->tmr_res = 1; } else { td->tmr_val = 0; - td->tmr_res = 0; + td->tmr_res = (uint8_t)sc->sc_last_frame_num; } break; case USB_SPEED_HIGH: @@ -3269,7 +3270,7 @@ dwc_otg_setup_standard_chain(struct usb_ td->tmr_res = 1 << usbd_xfer_get_fps_shift(xfer); } else { td->tmr_val = 0; - td->tmr_res = 0; + td->tmr_res = (uint8_t)sc->sc_last_frame_num; } break; default: @@ -3309,8 +3310,6 @@ static void dwc_otg_start_standard_chain(struct usb_xfer *xfer) { struct dwc_otg_softc *sc = DWC_OTG_BUS2SC(xfer->xroot->bus); - struct usb_xfer_root *xroot; - struct dwc_otg_td *td; DPRINTFN(9, "\n"); @@ -3341,24 +3340,6 @@ dwc_otg_start_standard_chain(struct usb_ /* enable SOF interrupt, if any */ dwc_otg_enable_sof_irq(sc); - - td = xfer->td_transfer_cache; - if (td->ep_type != UE_BULK) - goto done; - - xroot = xfer->xroot; - - /* - * Optimise the ping-pong effect by waking up other BULK - * transfers belonging to the same device group: - */ - TAILQ_FOREACH(xfer, &sc->sc_bus.intr_q.head, wait_entry) { - td = xfer->td_transfer_cache; - if (td == NULL || td->ep_type != UE_BULK || xfer->xroot != xroot) - continue; - /* reset NAK counter */ - td->did_nak = 0; - } done: USB_BUS_SPIN_UNLOCK(&sc->sc_bus); } Modified: head/sys/dev/usb/controller/dwc_otg.h ============================================================================== --- head/sys/dev/usb/controller/dwc_otg.h Tue Jul 28 07:04:51 2015 (r285934) +++ head/sys/dev/usb/controller/dwc_otg.h Tue Jul 28 07:30:07 2015 (r285935) @@ -37,7 +37,6 @@ #define DWC_OTG_TT_SLOT_MAX 8 #define DWC_OTG_SLOT_IDLE_MAX 3 #define DWC_OTG_SLOT_IDLE_MIN 2 -#define DWC_OTG_NAK_MAX 16 /* 16 NAKs = 2 ms */ #ifndef DWC_OTG_TX_MAX_FIFO_SIZE #define DWC_OTG_TX_MAX_FIFO_SIZE DWC_OTG_MAX_TXN #endif @@ -68,7 +67,6 @@ struct dwc_otg_td { uint8_t errcnt; uint8_t tmr_res; uint8_t tmr_val; - uint8_t did_nak; /* NAK counter */ uint8_t ep_no; uint8_t ep_type; uint8_t channel; @@ -93,6 +91,7 @@ struct dwc_otg_td { uint8_t set_toggle:1; uint8_t got_short:1; uint8_t tt_scheduled:1; + uint8_t did_nak:1; }; struct dwc_otg_tt_info {