/* * WUSB cluster reservation management * * Copyright (C) 2007 Cambridge Silicon Radio Ltd. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License version * 2 as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ #include #include #include "wusbhc.h" /* * WUSB cluster reservations are multicast reservations with the * broadcast cluster ID (BCID) as the target DevAddr. * * FIXME: consider adjusting the reservation depending on what devices * are attached. */ static int wusbhc_bwa_set(struct wusbhc *wusbhc, u8 stream, const struct uwb_mas_bm *mas) { if (mas == NULL) mas = &uwb_mas_bm_zero; return wusbhc->bwa_set(wusbhc, stream, mas); } /** * wusbhc_rsv_complete_cb - WUSB HC reservation complete callback * @rsv: the reservation * * Either set or clear the HC's view of the reservation. * * FIXME: when a reservation is denied the HC should be stopped. */ static void wusbhc_rsv_complete_cb(struct uwb_rsv *rsv) { struct wusbhc *wusbhc = rsv->pal_priv; struct device *dev = wusbhc->dev; struct uwb_mas_bm mas; dev_dbg(dev, "%s: state = %d\n", __func__, rsv->state); switch (rsv->state) { case UWB_RSV_STATE_O_ESTABLISHED: uwb_rsv_get_usable_mas(rsv, &mas); dev_dbg(dev, "established reservation: %*pb\n", UWB_NUM_MAS, mas.bm); wusbhc_bwa_set(wusbhc, rsv->stream, &mas); break; case UWB_RSV_STATE_NONE: dev_dbg(dev, "removed reservation\n"); wusbhc_bwa_set(wusbhc, 0, NULL); break; default: dev_dbg(dev, "unexpected reservation state: %d\n", rsv->state); break; } } /** * wusbhc_rsv_establish - establish a reservation for the cluster * @wusbhc: the WUSB HC requesting a bandwidth reservation */ int wusbhc_rsv_establish(struct wusbhc *wusbhc) { struct uwb_rc *rc = wusbhc->uwb_rc; struct uwb_rsv *rsv; struct uwb_dev_addr bcid; int ret; if (rc == NULL) return -ENODEV; rsv = uwb_rsv_create(rc, wusbhc_rsv_complete_cb, wusbhc); if (rsv == NULL) return -ENOMEM; bcid.data[0] = wusbhc->cluster_id; bcid.data[1] = 0; rsv->target.type = UWB_RSV_TARGET_DEVADDR; rsv->target.devaddr = bcid; rsv->type = UWB_DRP_TYPE_PRIVATE; rsv->max_mas = 256; /* try to get as much as possible */ rsv->min_mas = 15; /* one MAS per zone */ rsv->max_interval = 1; /* max latency is one zone */ rsv->is_multicast = true; ret = uwb_rsv_establish(rsv); if (ret == 0) wusbhc->rsv = rsv; else uwb_rsv_destroy(rsv); return ret; } /** * wusbhc_rsv_terminate - terminate the cluster reservation * @wusbhc: the WUSB host whose reservation is to be terminated */ void wusbhc_rsv_terminate(struct wusbhc *wusbhc) { if (wusbhc->rsv) { uwb_rsv_terminate(wusbhc->rsv); uwb_rsv_destroy(wusbhc->rsv); wusbhc->rsv = NULL; } } e/net/rawv6.h?id=5b7d616dbccc2fd6ae959045e1a9ca17de5dfc2a&showmsg=1'>Expand)AuthorFilesLines