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-rw-r--r--drivers/staging/uwb/drp-ie.c305
1 files changed, 305 insertions, 0 deletions
diff --git a/drivers/staging/uwb/drp-ie.c b/drivers/staging/uwb/drp-ie.c
new file mode 100644
index 000000000000..b2a862cf76de
--- /dev/null
+++ b/drivers/staging/uwb/drp-ie.c
@@ -0,0 +1,305 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * UWB DRP IE management.
+ *
+ * Copyright (C) 2005-2006 Intel Corporation
+ * Copyright (C) 2008 Cambridge Silicon Radio Ltd.
+ */
+#include <linux/kernel.h>
+#include <linux/random.h>
+#include <linux/slab.h>
+
+#include "uwb.h"
+#include "uwb-internal.h"
+
+
+/*
+ * Return the reason code for a reservations's DRP IE.
+ */
+static int uwb_rsv_reason_code(struct uwb_rsv *rsv)
+{
+ static const int reason_codes[] = {
+ [UWB_RSV_STATE_O_INITIATED] = UWB_DRP_REASON_ACCEPTED,
+ [UWB_RSV_STATE_O_PENDING] = UWB_DRP_REASON_ACCEPTED,
+ [UWB_RSV_STATE_O_MODIFIED] = UWB_DRP_REASON_MODIFIED,
+ [UWB_RSV_STATE_O_ESTABLISHED] = UWB_DRP_REASON_ACCEPTED,
+ [UWB_RSV_STATE_O_TO_BE_MOVED] = UWB_DRP_REASON_ACCEPTED,
+ [UWB_RSV_STATE_O_MOVE_COMBINING] = UWB_DRP_REASON_MODIFIED,
+ [UWB_RSV_STATE_O_MOVE_REDUCING] = UWB_DRP_REASON_MODIFIED,
+ [UWB_RSV_STATE_O_MOVE_EXPANDING] = UWB_DRP_REASON_ACCEPTED,
+ [UWB_RSV_STATE_T_ACCEPTED] = UWB_DRP_REASON_ACCEPTED,
+ [UWB_RSV_STATE_T_CONFLICT] = UWB_DRP_REASON_CONFLICT,
+ [UWB_RSV_STATE_T_PENDING] = UWB_DRP_REASON_PENDING,
+ [UWB_RSV_STATE_T_DENIED] = UWB_DRP_REASON_DENIED,
+ [UWB_RSV_STATE_T_RESIZED] = UWB_DRP_REASON_ACCEPTED,
+ [UWB_RSV_STATE_T_EXPANDING_ACCEPTED] = UWB_DRP_REASON_ACCEPTED,
+ [UWB_RSV_STATE_T_EXPANDING_CONFLICT] = UWB_DRP_REASON_CONFLICT,
+ [UWB_RSV_STATE_T_EXPANDING_PENDING] = UWB_DRP_REASON_PENDING,
+ [UWB_RSV_STATE_T_EXPANDING_DENIED] = UWB_DRP_REASON_DENIED,
+ };
+
+ return reason_codes[rsv->state];
+}
+
+/*
+ * Return the reason code for a reservations's companion DRP IE .
+ */
+static int uwb_rsv_companion_reason_code(struct uwb_rsv *rsv)
+{
+ static const int companion_reason_codes[] = {
+ [UWB_RSV_STATE_O_MOVE_EXPANDING] = UWB_DRP_REASON_ACCEPTED,
+ [UWB_RSV_STATE_T_EXPANDING_ACCEPTED] = UWB_DRP_REASON_ACCEPTED,
+ [UWB_RSV_STATE_T_EXPANDING_CONFLICT] = UWB_DRP_REASON_CONFLICT,
+ [UWB_RSV_STATE_T_EXPANDING_PENDING] = UWB_DRP_REASON_PENDING,
+ [UWB_RSV_STATE_T_EXPANDING_DENIED] = UWB_DRP_REASON_DENIED,
+ };
+
+ return companion_reason_codes[rsv->state];
+}
+
+/*
+ * Return the status bit for a reservations's DRP IE.
+ */
+int uwb_rsv_status(struct uwb_rsv *rsv)
+{
+ static const int statuses[] = {
+ [UWB_RSV_STATE_O_INITIATED] = 0,
+ [UWB_RSV_STATE_O_PENDING] = 0,
+ [UWB_RSV_STATE_O_MODIFIED] = 1,
+ [UWB_RSV_STATE_O_ESTABLISHED] = 1,
+ [UWB_RSV_STATE_O_TO_BE_MOVED] = 0,
+ [UWB_RSV_STATE_O_MOVE_COMBINING] = 1,
+ [UWB_RSV_STATE_O_MOVE_REDUCING] = 1,
+ [UWB_RSV_STATE_O_MOVE_EXPANDING] = 1,
+ [UWB_RSV_STATE_T_ACCEPTED] = 1,
+ [UWB_RSV_STATE_T_CONFLICT] = 0,
+ [UWB_RSV_STATE_T_PENDING] = 0,
+ [UWB_RSV_STATE_T_DENIED] = 0,
+ [UWB_RSV_STATE_T_RESIZED] = 1,
+ [UWB_RSV_STATE_T_EXPANDING_ACCEPTED] = 1,
+ [UWB_RSV_STATE_T_EXPANDING_CONFLICT] = 1,
+ [UWB_RSV_STATE_T_EXPANDING_PENDING] = 1,
+ [UWB_RSV_STATE_T_EXPANDING_DENIED] = 1,
+
+ };
+
+ return statuses[rsv->state];
+}
+
+/*
+ * Return the status bit for a reservations's companion DRP IE .
+ */
+int uwb_rsv_companion_status(struct uwb_rsv *rsv)
+{
+ static const int companion_statuses[] = {
+ [UWB_RSV_STATE_O_MOVE_EXPANDING] = 0,
+ [UWB_RSV_STATE_T_EXPANDING_ACCEPTED] = 1,
+ [UWB_RSV_STATE_T_EXPANDING_CONFLICT] = 0,
+ [UWB_RSV_STATE_T_EXPANDING_PENDING] = 0,
+ [UWB_RSV_STATE_T_EXPANDING_DENIED] = 0,
+ };
+
+ return companion_statuses[rsv->state];
+}
+
+/*
+ * Allocate a DRP IE.
+ *
+ * To save having to free/allocate a DRP IE when its MAS changes,
+ * enough memory is allocated for the maxiumum number of DRP
+ * allocation fields. This gives an overhead per reservation of up to
+ * (UWB_NUM_ZONES - 1) * 4 = 60 octets.
+ */
+static struct uwb_ie_drp *uwb_drp_ie_alloc(void)
+{
+ struct uwb_ie_drp *drp_ie;
+
+ drp_ie = kzalloc(struct_size(drp_ie, allocs, UWB_NUM_ZONES),
+ GFP_KERNEL);
+ if (drp_ie)
+ drp_ie->hdr.element_id = UWB_IE_DRP;
+ return drp_ie;
+}
+
+
+/*
+ * Fill a DRP IE's allocation fields from a MAS bitmap.
+ */
+static void uwb_drp_ie_from_bm(struct uwb_ie_drp *drp_ie,
+ struct uwb_mas_bm *mas)
+{
+ int z, i, num_fields = 0, next = 0;
+ struct uwb_drp_alloc *zones;
+ __le16 current_bmp;
+ DECLARE_BITMAP(tmp_bmp, UWB_NUM_MAS);
+ DECLARE_BITMAP(tmp_mas_bm, UWB_MAS_PER_ZONE);
+
+ zones = drp_ie->allocs;
+
+ bitmap_copy(tmp_bmp, mas->bm, UWB_NUM_MAS);
+
+ /* Determine unique MAS bitmaps in zones from bitmap. */
+ for (z = 0; z < UWB_NUM_ZONES; z++) {
+ bitmap_copy(tmp_mas_bm, tmp_bmp, UWB_MAS_PER_ZONE);
+ if (bitmap_weight(tmp_mas_bm, UWB_MAS_PER_ZONE) > 0) {
+ bool found = false;
+ current_bmp = (__le16) *tmp_mas_bm;
+ for (i = 0; i < next; i++) {
+ if (current_bmp == zones[i].mas_bm) {
+ zones[i].zone_bm |= 1 << z;
+ found = true;
+ break;
+ }
+ }
+ if (!found) {
+ num_fields++;
+ zones[next].zone_bm = 1 << z;
+ zones[next].mas_bm = current_bmp;
+ next++;
+ }
+ }
+ bitmap_shift_right(tmp_bmp, tmp_bmp, UWB_MAS_PER_ZONE, UWB_NUM_MAS);
+ }
+
+ /* Store in format ready for transmission (le16). */
+ for (i = 0; i < num_fields; i++) {
+ drp_ie->allocs[i].zone_bm = cpu_to_le16(zones[i].zone_bm);
+ drp_ie->allocs[i].mas_bm = cpu_to_le16(zones[i].mas_bm);
+ }
+
+ drp_ie->hdr.length = sizeof(struct uwb_ie_drp) - sizeof(struct uwb_ie_hdr)
+ + num_fields * sizeof(struct uwb_drp_alloc);
+}
+
+/**
+ * uwb_drp_ie_update - update a reservation's DRP IE
+ * @rsv: the reservation
+ */
+int uwb_drp_ie_update(struct uwb_rsv *rsv)
+{
+ struct uwb_ie_drp *drp_ie;
+ struct uwb_rsv_move *mv;
+ int unsafe;
+
+ if (rsv->state == UWB_RSV_STATE_NONE) {
+ kfree(rsv->drp_ie);
+ rsv->drp_ie = NULL;
+ return 0;
+ }
+
+ unsafe = rsv->mas.unsafe ? 1 : 0;
+
+ if (rsv->drp_ie == NULL) {
+ rsv->drp_ie = uwb_drp_ie_alloc();
+ if (rsv->drp_ie == NULL)
+ return -ENOMEM;
+ }
+ drp_ie = rsv->drp_ie;
+
+ uwb_ie_drp_set_unsafe(drp_ie, unsafe);
+ uwb_ie_drp_set_tiebreaker(drp_ie, rsv->tiebreaker);
+ uwb_ie_drp_set_owner(drp_ie, uwb_rsv_is_owner(rsv));
+ uwb_ie_drp_set_status(drp_ie, uwb_rsv_status(rsv));
+ uwb_ie_drp_set_reason_code(drp_ie, uwb_rsv_reason_code(rsv));
+ uwb_ie_drp_set_stream_index(drp_ie, rsv->stream);
+ uwb_ie_drp_set_type(drp_ie, rsv->type);
+
+ if (uwb_rsv_is_owner(rsv)) {
+ switch (rsv->target.type) {
+ case UWB_RSV_TARGET_DEV:
+ drp_ie->dev_addr = rsv->target.dev->dev_addr;
+ break;
+ case UWB_RSV_TARGET_DEVADDR:
+ drp_ie->dev_addr = rsv->target.devaddr;
+ break;
+ }
+ } else
+ drp_ie->dev_addr = rsv->owner->dev_addr;
+
+ uwb_drp_ie_from_bm(drp_ie, &rsv->mas);
+
+ if (uwb_rsv_has_two_drp_ies(rsv)) {
+ mv = &rsv->mv;
+ if (mv->companion_drp_ie == NULL) {
+ mv->companion_drp_ie = uwb_drp_ie_alloc();
+ if (mv->companion_drp_ie == NULL)
+ return -ENOMEM;
+ }
+ drp_ie = mv->companion_drp_ie;
+
+ /* keep all the same configuration of the main drp_ie */
+ memcpy(drp_ie, rsv->drp_ie, sizeof(struct uwb_ie_drp));
+
+
+ /* FIXME: handle properly the unsafe bit */
+ uwb_ie_drp_set_unsafe(drp_ie, 1);
+ uwb_ie_drp_set_status(drp_ie, uwb_rsv_companion_status(rsv));
+ uwb_ie_drp_set_reason_code(drp_ie, uwb_rsv_companion_reason_code(rsv));
+
+ uwb_drp_ie_from_bm(drp_ie, &mv->companion_mas);
+ }
+
+ rsv->ie_valid = true;
+ return 0;
+}
+
+/*
+ * Set MAS bits from given MAS bitmap in a single zone of large bitmap.
+ *
+ * We are given a zone id and the MAS bitmap of bits that need to be set in
+ * this zone. Note that this zone may already have bits set and this only
+ * adds settings - we cannot simply assign the MAS bitmap contents to the
+ * zone contents. We iterate over the the bits (MAS) in the zone and set the
+ * bits that are set in the given MAS bitmap.
+ */
+static
+void uwb_drp_ie_single_zone_to_bm(struct uwb_mas_bm *bm, u8 zone, u16 mas_bm)
+{
+ int mas;
+ u16 mas_mask;
+
+ for (mas = 0; mas < UWB_MAS_PER_ZONE; mas++) {
+ mas_mask = 1 << mas;
+ if (mas_bm & mas_mask)
+ set_bit(zone * UWB_NUM_ZONES + mas, bm->bm);
+ }
+}
+
+/**
+ * uwb_drp_ie_zones_to_bm - convert DRP allocation fields to a bitmap
+ * @mas: MAS bitmap that will be populated to correspond to the
+ * allocation fields in the DRP IE
+ * @drp_ie: the DRP IE that contains the allocation fields.
+ *
+ * The input format is an array of MAS allocation fields (16 bit Zone
+ * bitmap, 16 bit MAS bitmap) as described in [ECMA-368] section
+ * 16.8.6. The output is a full 256 bit MAS bitmap.
+ *
+ * We go over all the allocation fields, for each allocation field we
+ * know which zones are impacted. We iterate over all the zones
+ * impacted and call a function that will set the correct MAS bits in
+ * each zone.
+ */
+void uwb_drp_ie_to_bm(struct uwb_mas_bm *bm, const struct uwb_ie_drp *drp_ie)
+{
+ int numallocs = (drp_ie->hdr.length - 4) / 4;
+ const struct uwb_drp_alloc *alloc;
+ int cnt;
+ u16 zone_bm, mas_bm;
+ u8 zone;
+ u16 zone_mask;
+
+ bitmap_zero(bm->bm, UWB_NUM_MAS);
+
+ for (cnt = 0; cnt < numallocs; cnt++) {
+ alloc = &drp_ie->allocs[cnt];
+ zone_bm = le16_to_cpu(alloc->zone_bm);
+ mas_bm = le16_to_cpu(alloc->mas_bm);
+ for (zone = 0; zone < UWB_NUM_ZONES; zone++) {
+ zone_mask = 1 << zone;
+ if (zone_bm & zone_mask)
+ uwb_drp_ie_single_zone_to_bm(bm, zone, mas_bm);
+ }
+ }
+}
+
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.