}
/**
- * tb_path_switch_on_path() - Does the path go through certain switch
+ * tb_path_port_on_path() - Does the path go through certain port
* @path: Path to check
- * @sw: Switch to check
+ * @port: Switch to check
*
- * Goes over all hops on path and checks if @sw is any of them.
+ * Goes over all hops on path and checks if @port is any of them.
* Direction does not matter.
*/
-bool tb_path_switch_on_path(const struct tb_path *path,
- const struct tb_switch *sw)
+bool tb_path_port_on_path(const struct tb_path *path, const struct tb_port *port)
{
int i;
for (i = 0; i < path->path_length; i++) {
- if (path->hops[i].in_port->sw == sw ||
- path->hops[i].out_port->sw == sw)
+ if (path->hops[i].in_port == port ||
+ path->hops[i].out_port == port)
return true;
}
return NULL;
}
+static struct tb_tunnel *tb_find_tunnel(struct tb *tb, enum tb_tunnel_type type,
+ struct tb_port *src_port,
+ struct tb_port *dst_port)
+{
+ struct tb_cm *tcm = tb_priv(tb);
+ struct tb_tunnel *tunnel;
+
+ list_for_each_entry(tunnel, &tcm->tunnel_list, list) {
+ if (tunnel->type == type &&
+ ((src_port && src_port == tunnel->src_port) ||
+ (dst_port && dst_port == tunnel->dst_port))) {
+ return tunnel;
+ }
+ }
+
+ return NULL;
+}
+
+static struct tb_tunnel *tb_find_first_usb3_tunnel(struct tb *tb,
+ struct tb_port *src_port,
+ struct tb_port *dst_port)
+{
+ struct tb_port *port, *usb3_down;
+ struct tb_switch *sw;
+
+ /* Pick the router that is deepest in the topology */
+ if (dst_port->sw->config.depth > src_port->sw->config.depth)
+ sw = dst_port->sw;
+ else
+ sw = src_port->sw;
+
+ /* Can't be the host router */
+ if (sw == tb->root_switch)
+ return NULL;
+
+ /* Find the downstream USB4 port that leads to this router */
+ port = tb_port_at(tb_route(sw), tb->root_switch);
+ /* Find the corresponding host router USB3 downstream port */
+ usb3_down = usb4_switch_map_usb3_down(tb->root_switch, port);
+ if (!usb3_down)
+ return NULL;
+
+ return tb_find_tunnel(tb, TB_TUNNEL_USB3, usb3_down, NULL);
+}
+
+static int tb_available_bandwidth(struct tb *tb, struct tb_port *src_port,
+ struct tb_port *dst_port, int *available_up, int *available_down)
+{
+ int usb3_consumed_up, usb3_consumed_down, ret;
+ struct tb_cm *tcm = tb_priv(tb);
+ struct tb_tunnel *tunnel;
+ struct tb_port *port;
+
+ tb_port_dbg(dst_port, "calculating available bandwidth\n");
+
+ tunnel = tb_find_first_usb3_tunnel(tb, src_port, dst_port);
+ if (tunnel) {
+ ret = tb_tunnel_consumed_bandwidth(tunnel, &usb3_consumed_up,
+ &usb3_consumed_down);
+ if (ret)
+ return ret;
+ } else {
+ usb3_consumed_up = 0;
+ usb3_consumed_down = 0;
+ }
+
+ *available_up = *available_down = 40000;
+
+ /* Find the minimum available bandwidth over all links */
+ tb_for_each_port_on_path(src_port, dst_port, port) {
+ int link_speed, link_width, up_bw, down_bw;
+
+ if (!tb_port_is_null(port))
+ continue;
+
+ if (tb_is_upstream_port(port)) {
+ link_speed = port->sw->link_speed;
+ } else {
+ link_speed = tb_port_get_link_speed(port);
+ if (link_speed < 0)
+ return link_speed;
+ }
+
+ link_width = port->bonded ? 2 : 1;
+
+ up_bw = link_speed * link_width * 1000; /* Mb/s */
+ /* Leave 10% guard band */
+ up_bw -= up_bw / 10;
+ down_bw = up_bw;
+
+ tb_port_dbg(port, "link total bandwidth %d Mb/s\n", up_bw);
+
+ /*
+ * Find all DP tunnels that cross the port and reduce
+ * their consumed bandwidth from the available.
+ */
+ list_for_each_entry(tunnel, &tcm->tunnel_list, list) {
+ int dp_consumed_up, dp_consumed_down;
+
+ if (!tb_tunnel_is_dp(tunnel))
+ continue;
+
+ if (!tb_tunnel_port_on_path(tunnel, port))
+ continue;
+
+ ret = tb_tunnel_consumed_bandwidth(tunnel,
+ &dp_consumed_up,
+ &dp_consumed_down);
+ if (ret)
+ return ret;
+
+ up_bw -= dp_consumed_up;
+ down_bw -= dp_consumed_down;
+ }
+
+ /*
+ * If USB3 is tunneled from the host router down to the
+ * branch leading to port we need to take USB3 consumed
+ * bandwidth into account regardless whether it actually
+ * crosses the port.
+ */
+ up_bw -= usb3_consumed_up;
+ down_bw -= usb3_consumed_down;
+
+ if (up_bw < *available_up)
+ *available_up = up_bw;
+ if (down_bw < *available_down)
+ *available_down = down_bw;
+ }
+
+ if (*available_up < 0)
+ *available_up = 0;
+ if (*available_down < 0)
+ *available_down = 0;
+
+ return 0;
+}
+
+static int tb_release_unused_usb3_bandwidth(struct tb *tb,
+ struct tb_port *src_port,
+ struct tb_port *dst_port)
+{
+ struct tb_tunnel *tunnel;
+
+ tunnel = tb_find_first_usb3_tunnel(tb, src_port, dst_port);
+ return tunnel ? tb_tunnel_release_unused_bandwidth(tunnel) : 0;
+}
+
+static void tb_reclaim_usb3_bandwidth(struct tb *tb, struct tb_port *src_port,
+ struct tb_port *dst_port)
+{
+ int ret, available_up, available_down;
+ struct tb_tunnel *tunnel;
+
+ tunnel = tb_find_first_usb3_tunnel(tb, src_port, dst_port);
+ if (!tunnel)
+ return;
+
+ tb_dbg(tb, "reclaiming unused bandwidth for USB3\n");
+
+ /*
+ * Calculate available bandwidth for the first hop USB3 tunnel.
+ * That determines the whole USB3 bandwidth for this branch.
+ */
+ ret = tb_available_bandwidth(tb, tunnel->src_port, tunnel->dst_port,
+ &available_up, &available_down);
+ if (ret) {
+ tb_warn(tb, "failed to calculate available bandwidth\n");
+ return;
+ }
+
+ tb_dbg(tb, "available bandwidth for USB3 %d/%d Mb/s\n",
+ available_up, available_down);
+
+ tb_tunnel_reclaim_available_bandwidth(tunnel, &available_up, &available_down);
+}
+
static int tb_tunnel_usb3(struct tb *tb, struct tb_switch *sw)
{
struct tb_switch *parent = tb_switch_parent(sw);
+ int ret, available_up, available_down;
struct tb_port *up, *down, *port;
struct tb_cm *tcm = tb_priv(tb);
struct tb_tunnel *tunnel;
parent_up = tb_switch_find_port(parent, TB_TYPE_USB3_UP);
if (!parent_up || !tb_port_is_enabled(parent_up))
return 0;
+
+ /* Make all unused bandwidth available for the new tunnel */
+ ret = tb_release_unused_usb3_bandwidth(tb, down, up);
+ if (ret)
+ return ret;
}
- tunnel = tb_tunnel_alloc_usb3(tb, up, down);
- if (!tunnel)
- return -ENOMEM;
+ ret = tb_available_bandwidth(tb, down, up, &available_up,
+ &available_down);
+ if (ret)
+ goto err_reclaim;
+
+ tb_port_dbg(up, "available bandwidth for new USB3 tunnel %d/%d Mb/s\n",
+ available_up, available_down);
+
+ tunnel = tb_tunnel_alloc_usb3(tb, up, down, available_up,
+ available_down);
+ if (!tunnel) {
+ ret = -ENOMEM;
+ goto err_reclaim;
+ }
if (tb_tunnel_activate(tunnel)) {
tb_port_info(up,
"USB3 tunnel activation failed, aborting\n");
- tb_tunnel_free(tunnel);
- return -EIO;
+ ret = -EIO;
+ goto err_free;
}
list_add_tail(&tunnel->list, &tcm->tunnel_list);
+ if (tb_route(parent))
+ tb_reclaim_usb3_bandwidth(tb, down, up);
+
return 0;
+
+err_free:
+ tb_tunnel_free(tunnel);
+err_reclaim:
+ if (tb_route(parent))
+ tb_reclaim_usb3_bandwidth(tb, down, up);
+
+ return ret;
}
static int tb_create_usb3_tunnels(struct tb_switch *sw)
tb_scan_switch(sw);
}
-static struct tb_tunnel *tb_find_tunnel(struct tb *tb, enum tb_tunnel_type type,
- struct tb_port *src_port,
- struct tb_port *dst_port)
-{
- struct tb_cm *tcm = tb_priv(tb);
- struct tb_tunnel *tunnel;
-
- list_for_each_entry(tunnel, &tcm->tunnel_list, list) {
- if (tunnel->type == type &&
- ((src_port && src_port == tunnel->src_port) ||
- (dst_port && dst_port == tunnel->dst_port))) {
- return tunnel;
- }
- }
-
- return NULL;
-}
-
static void tb_deactivate_and_free_tunnel(struct tb_tunnel *tunnel)
{
+ struct tb_port *src_port, *dst_port;
+ struct tb *tb;
+
if (!tunnel)
return;
tb_tunnel_deactivate(tunnel);
list_del(&tunnel->list);
- /*
- * In case of DP tunnel make sure the DP IN resource is deallocated
- * properly.
- */
- if (tb_tunnel_is_dp(tunnel)) {
- struct tb_port *in = tunnel->src_port;
+ tb = tunnel->tb;
+ src_port = tunnel->src_port;
+ dst_port = tunnel->dst_port;
+
+ switch (tunnel->type) {
+ case TB_TUNNEL_DP:
+ /*
+ * In case of DP tunnel make sure the DP IN resource is
+ * deallocated properly.
+ */
+ tb_switch_dealloc_dp_resource(src_port->sw, src_port);
+ fallthrough;
- tb_switch_dealloc_dp_resource(in->sw, in);
+ case TB_TUNNEL_USB3:
+ tb_reclaim_usb3_bandwidth(tb, src_port, dst_port);
+ break;
+
+ default:
+ /*
+ * PCIe and DMA tunnels do not consume guaranteed
+ * bandwidth.
+ */
+ break;
}
tb_tunnel_free(tunnel);
return tb_find_unused_port(sw, TB_TYPE_PCIE_DOWN);
}
-static int tb_available_bw(struct tb_cm *tcm, struct tb_port *in,
- struct tb_port *out)
-{
- struct tb_switch *sw = out->sw;
- struct tb_tunnel *tunnel;
- int ret, bw, available_bw = 40000;
-
- while (sw && sw != in->sw) {
- bw = sw->link_speed * sw->link_width * 1000; /* Mb/s */
- /* Leave 10% guard band */
- bw -= bw / 10;
-
- /*
- * Check for any active DP tunnels that go through this
- * switch and reduce their consumed bandwidth from
- * available.
- */
- list_for_each_entry(tunnel, &tcm->tunnel_list, list) {
- int consumed_bw;
-
- if (!tb_tunnel_switch_on_path(tunnel, sw))
- continue;
-
- ret = tb_tunnel_consumed_bandwidth(tunnel, NULL,
- &consumed_bw);
- if (ret)
- return ret;
-
- bw -= consumed_bw;
- }
-
- if (bw < available_bw)
- available_bw = bw;
-
- sw = tb_switch_parent(sw);
- }
-
- return available_bw;
-}
-
static struct tb_port *tb_find_dp_out(struct tb *tb, struct tb_port *in)
{
struct tb_port *host_port, *port;
static void tb_tunnel_dp(struct tb *tb)
{
+ int available_up, available_down, ret;
struct tb_cm *tcm = tb_priv(tb);
struct tb_port *port, *in, *out;
struct tb_tunnel *tunnel;
- int available_bw;
/*
* Find pair of inactive DP IN and DP OUT adapters and then
return;
}
- /* Calculate available bandwidth between in and out */
- available_bw = tb_available_bw(tcm, in, out);
- if (available_bw < 0) {
- tb_warn(tb, "failed to determine available bandwidth\n");
- return;
+ /* Make all unused USB3 bandwidth available for the new DP tunnel */
+ ret = tb_release_unused_usb3_bandwidth(tb, in, out);
+ if (ret) {
+ tb_warn(tb, "failed to release unused bandwidth\n");
+ goto err_dealloc_dp;
}
- tb_dbg(tb, "available bandwidth for new DP tunnel %u Mb/s\n",
- available_bw);
+ ret = tb_available_bandwidth(tb, in, out, &available_up,
+ &available_down);
+ if (ret)
+ goto err_reclaim;
+
+ tb_dbg(tb, "available bandwidth for new DP tunnel %u/%u Mb/s\n",
+ available_up, available_down);
- tunnel = tb_tunnel_alloc_dp(tb, in, out, available_bw);
+ tunnel = tb_tunnel_alloc_dp(tb, in, out, available_up, available_down);
if (!tunnel) {
tb_port_dbg(out, "could not allocate DP tunnel\n");
- goto dealloc_dp;
+ goto err_reclaim;
}
if (tb_tunnel_activate(tunnel)) {
tb_port_info(out, "DP tunnel activation failed, aborting\n");
- tb_tunnel_free(tunnel);
- goto dealloc_dp;
+ goto err_free;
}
list_add_tail(&tunnel->list, &tcm->tunnel_list);
+ tb_reclaim_usb3_bandwidth(tb, in, out);
return;
-dealloc_dp:
+err_free:
+ tb_tunnel_free(tunnel);
+err_reclaim:
+ tb_reclaim_usb3_bandwidth(tb, in, out);
+err_dealloc_dp:
tb_switch_dealloc_dp_resource(in->sw, in);
}
int tb_path_activate(struct tb_path *path);
void tb_path_deactivate(struct tb_path *path);
bool tb_path_is_invalid(struct tb_path *path);
-bool tb_path_switch_on_path(const struct tb_path *path,
- const struct tb_switch *sw);
+bool tb_path_port_on_path(const struct tb_path *path,
+ const struct tb_port *port);
int tb_drom_read(struct tb_switch *sw);
int tb_drom_read_uid_only(struct tb_switch *sw, u64 *uid);
u32 out_dp_cap, out_rate, out_lanes, in_dp_cap, in_rate, in_lanes, bw;
struct tb_port *out = tunnel->dst_port;
struct tb_port *in = tunnel->src_port;
- int ret;
+ int ret, max_bw;
/*
* Copy DP_LOCAL_CAP register to DP_REMOTE_CAP register for
tb_port_dbg(out, "maximum supported bandwidth %u Mb/s x%u = %u Mb/s\n",
out_rate, out_lanes, bw);
- if (tunnel->max_bw && bw > tunnel->max_bw) {
+ if (in->sw->config.depth < out->sw->config.depth)
+ max_bw = tunnel->max_down;
+ else
+ max_bw = tunnel->max_up;
+
+ if (max_bw && bw > max_bw) {
u32 new_rate, new_lanes, new_bw;
- ret = tb_dp_reduce_bandwidth(tunnel->max_bw, in_rate, in_lanes,
+ ret = tb_dp_reduce_bandwidth(max_bw, in_rate, in_lanes,
out_rate, out_lanes, &new_rate,
&new_lanes);
if (ret) {
* @tb: Pointer to the domain structure
* @in: DP in adapter port
* @out: DP out adapter port
- * @max_bw: Maximum available bandwidth for the DP tunnel (%0 if not limited)
+ * @max_up: Maximum available upstream bandwidth for the DP tunnel (%0
+ * if not limited)
+ * @max_down: Maximum available downstream bandwidth for the DP tunnel
+ * (%0 if not limited)
*
* Allocates a tunnel between @in and @out that is capable of tunneling
* Display Port traffic.
* Return: Returns a tb_tunnel on success or NULL on failure.
*/
struct tb_tunnel *tb_tunnel_alloc_dp(struct tb *tb, struct tb_port *in,
- struct tb_port *out, int max_bw)
+ struct tb_port *out, int max_up,
+ int max_down)
{
struct tb_tunnel *tunnel;
struct tb_path **paths;
tunnel->consumed_bandwidth = tb_dp_consumed_bandwidth;
tunnel->src_port = in;
tunnel->dst_port = out;
- tunnel->max_bw = max_bw;
+ tunnel->max_up = max_up;
+ tunnel->max_down = max_down;
paths = tunnel->paths;
return tunnel;
}
+static int tb_usb3_max_link_rate(struct tb_port *up, struct tb_port *down)
+{
+ int ret, up_max_rate, down_max_rate;
+
+ ret = usb4_usb3_port_max_link_rate(up);
+ if (ret < 0)
+ return ret;
+ up_max_rate = ret;
+
+ ret = usb4_usb3_port_max_link_rate(down);
+ if (ret < 0)
+ return ret;
+ down_max_rate = ret;
+
+ return min(up_max_rate, down_max_rate);
+}
+
+static int tb_usb3_init(struct tb_tunnel *tunnel)
+{
+ tb_tunnel_dbg(tunnel, "allocating initial bandwidth %d/%d Mb/s\n",
+ tunnel->allocated_up, tunnel->allocated_down);
+
+ return usb4_usb3_port_allocate_bandwidth(tunnel->src_port,
+ &tunnel->allocated_up,
+ &tunnel->allocated_down);
+}
+
static int tb_usb3_activate(struct tb_tunnel *tunnel, bool activate)
{
int res;
return 0;
}
+static int tb_usb3_consumed_bandwidth(struct tb_tunnel *tunnel,
+ int *consumed_up, int *consumed_down)
+{
+ /*
+ * PCIe tunneling affects the USB3 bandwidth so take that it
+ * into account here.
+ */
+ *consumed_up = tunnel->allocated_up * (3 + 1) / 3;
+ *consumed_down = tunnel->allocated_down * (3 + 1) / 3;
+ return 0;
+}
+
+static int tb_usb3_release_unused_bandwidth(struct tb_tunnel *tunnel)
+{
+ int ret;
+
+ ret = usb4_usb3_port_release_bandwidth(tunnel->src_port,
+ &tunnel->allocated_up,
+ &tunnel->allocated_down);
+ if (ret)
+ return ret;
+
+ tb_tunnel_dbg(tunnel, "decreased bandwidth allocation to %d/%d Mb/s\n",
+ tunnel->allocated_up, tunnel->allocated_down);
+ return 0;
+}
+
+static void tb_usb3_reclaim_available_bandwidth(struct tb_tunnel *tunnel,
+ int *available_up,
+ int *available_down)
+{
+ int ret, max_rate, allocate_up, allocate_down;
+
+ ret = usb4_usb3_port_actual_link_rate(tunnel->src_port);
+ if (ret <= 0) {
+ tb_tunnel_warn(tunnel, "tunnel is not up\n");
+ return;
+ }
+ /*
+ * 90% of the max rate can be allocated for isochronous
+ * transfers.
+ */
+ max_rate = ret * 90 / 100;
+
+ /* No need to reclaim if already at maximum */
+ if (tunnel->allocated_up >= max_rate &&
+ tunnel->allocated_down >= max_rate)
+ return;
+
+ /* Don't go lower than what is already allocated */
+ allocate_up = min(max_rate, *available_up);
+ if (allocate_up < tunnel->allocated_up)
+ allocate_up = tunnel->allocated_up;
+
+ allocate_down = min(max_rate, *available_down);
+ if (allocate_down < tunnel->allocated_down)
+ allocate_down = tunnel->allocated_down;
+
+ /* If no changes no need to do more */
+ if (allocate_up == tunnel->allocated_up &&
+ allocate_down == tunnel->allocated_down)
+ return;
+
+ ret = usb4_usb3_port_allocate_bandwidth(tunnel->src_port, &allocate_up,
+ &allocate_down);
+ if (ret) {
+ tb_tunnel_info(tunnel, "failed to allocate bandwidth\n");
+ return;
+ }
+
+ tunnel->allocated_up = allocate_up;
+ *available_up -= tunnel->allocated_up;
+
+ tunnel->allocated_down = allocate_down;
+ *available_down -= tunnel->allocated_down;
+
+ tb_tunnel_dbg(tunnel, "increased bandwidth allocation to %d/%d Mb/s\n",
+ tunnel->allocated_up, tunnel->allocated_down);
+}
+
static void tb_usb3_init_path(struct tb_path *path)
{
path->egress_fc_enable = TB_PATH_SOURCE | TB_PATH_INTERNAL;
goto err_deactivate;
}
+ if (!tb_route(down->sw)) {
+ int ret;
+
+ /*
+ * Read the initial bandwidth allocation for the first
+ * hop tunnel.
+ */
+ ret = usb4_usb3_port_allocated_bandwidth(down,
+ &tunnel->allocated_up, &tunnel->allocated_down);
+ if (ret)
+ goto err_deactivate;
+
+ tb_tunnel_dbg(tunnel, "currently allocated bandwidth %d/%d Mb/s\n",
+ tunnel->allocated_up, tunnel->allocated_down);
+
+ tunnel->init = tb_usb3_init;
+ tunnel->consumed_bandwidth = tb_usb3_consumed_bandwidth;
+ tunnel->release_unused_bandwidth =
+ tb_usb3_release_unused_bandwidth;
+ tunnel->reclaim_available_bandwidth =
+ tb_usb3_reclaim_available_bandwidth;
+ }
+
tb_tunnel_dbg(tunnel, "discovered\n");
return tunnel;
* @tb: Pointer to the domain structure
* @up: USB3 upstream adapter port
* @down: USB3 downstream adapter port
+ * @max_up: Maximum available upstream bandwidth for the USB3 tunnel (%0
+ * if not limited).
+ * @max_down: Maximum available downstream bandwidth for the USB3 tunnel
+ * (%0 if not limited).
*
* Allocate an USB3 tunnel. The ports must be of type @TB_TYPE_USB3_UP and
* @TB_TYPE_USB3_DOWN.
* Return: Returns a tb_tunnel on success or %NULL on failure.
*/
struct tb_tunnel *tb_tunnel_alloc_usb3(struct tb *tb, struct tb_port *up,
- struct tb_port *down)
+ struct tb_port *down, int max_up,
+ int max_down)
{
struct tb_tunnel *tunnel;
struct tb_path *path;
+ int max_rate = 0;
+
+ /*
+ * Check that we have enough bandwidth available for the new
+ * USB3 tunnel.
+ */
+ if (max_up > 0 || max_down > 0) {
+ max_rate = tb_usb3_max_link_rate(down, up);
+ if (max_rate < 0)
+ return NULL;
+
+ /* Only 90% can be allocated for USB3 isochronous transfers */
+ max_rate = max_rate * 90 / 100;
+ tb_port_dbg(up, "required bandwidth for USB3 tunnel %d Mb/s\n",
+ max_rate);
+
+ if (max_rate > max_up || max_rate > max_down) {
+ tb_port_warn(up, "not enough bandwidth for USB3 tunnel\n");
+ return NULL;
+ }
+ }
tunnel = tb_tunnel_alloc(tb, 2, TB_TUNNEL_USB3);
if (!tunnel)
tunnel->activate = tb_usb3_activate;
tunnel->src_port = down;
tunnel->dst_port = up;
+ tunnel->max_up = max_up;
+ tunnel->max_down = max_down;
path = tb_path_alloc(tb, down, TB_USB3_HOPID, up, TB_USB3_HOPID, 0,
"USB3 Down");
tb_usb3_init_path(path);
tunnel->paths[TB_USB3_PATH_UP] = path;
+ if (!tb_route(down->sw)) {
+ tunnel->allocated_up = max_rate;
+ tunnel->allocated_down = max_rate;
+
+ tunnel->init = tb_usb3_init;
+ tunnel->consumed_bandwidth = tb_usb3_consumed_bandwidth;
+ tunnel->release_unused_bandwidth =
+ tb_usb3_release_unused_bandwidth;
+ tunnel->reclaim_available_bandwidth =
+ tb_usb3_reclaim_available_bandwidth;
+ }
+
return tunnel;
}
}
/**
- * tb_tunnel_switch_on_path() - Does the tunnel go through switch
+ * tb_tunnel_port_on_path() - Does the tunnel go through port
* @tunnel: Tunnel to check
- * @sw: Switch to check
+ * @port: Port to check
*
- * Returns true if @tunnel goes through @sw (direction does not matter),
+ * Returns true if @tunnel goes through @port (direction does not matter),
* false otherwise.
*/
-bool tb_tunnel_switch_on_path(const struct tb_tunnel *tunnel,
- const struct tb_switch *sw)
+bool tb_tunnel_port_on_path(const struct tb_tunnel *tunnel,
+ const struct tb_port *port)
{
int i;
for (i = 0; i < tunnel->npaths; i++) {
if (!tunnel->paths[i])
continue;
- if (tb_path_switch_on_path(tunnel->paths[i], sw))
+
+ if (tb_path_port_on_path(tunnel->paths[i], port))
return true;
}
return 0;
}
+
+/**
+ * tb_tunnel_release_unused_bandwidth() - Release unused bandwidth
+ * @tunnel: Tunnel whose unused bandwidth to release
+ *
+ * If tunnel supports dynamic bandwidth management (USB3 tunnels at the
+ * moment) this function makes it to release all the unused bandwidth.
+ *
+ * Returns %0 in case of success and negative errno otherwise.
+ */
+int tb_tunnel_release_unused_bandwidth(struct tb_tunnel *tunnel)
+{
+ if (!tb_tunnel_is_active(tunnel))
+ return 0;
+
+ if (tunnel->release_unused_bandwidth) {
+ int ret;
+
+ ret = tunnel->release_unused_bandwidth(tunnel);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+/**
+ * tb_tunnel_reclaim_available_bandwidth() - Reclaim available bandwidth
+ * @tunnel: Tunnel reclaiming available bandwidth
+ * @available_up: Available upstream bandwidth (in Mb/s)
+ * @available_down: Available downstream bandwidth (in Mb/s)
+ *
+ * Reclaims bandwidth from @available_up and @available_down and updates
+ * the variables accordingly (e.g decreases both according to what was
+ * reclaimed by the tunnel). If nothing was reclaimed the values are
+ * kept as is.
+ */
+void tb_tunnel_reclaim_available_bandwidth(struct tb_tunnel *tunnel,
+ int *available_up,
+ int *available_down)
+{
+ if (!tb_tunnel_is_active(tunnel))
+ return;
+
+ if (tunnel->reclaim_available_bandwidth)
+ tunnel->reclaim_available_bandwidth(tunnel, available_up,
+ available_down);
+}
* @init: Optional tunnel specific initialization
* @activate: Optional tunnel specific activation/deactivation
* @consumed_bandwidth: Return how much bandwidth the tunnel consumes
+ * @release_unused_bandwidth: Release all unused bandwidth
+ * @reclaim_available_bandwidth: Reclaim back available bandwidth
* @list: Tunnels are linked using this field
* @type: Type of the tunnel
- * @max_bw: Maximum bandwidth (Mb/s) available for the tunnel (only for DP).
+ * @max_up: Maximum upstream bandwidth (Mb/s) available for the tunnel.
* Only set if the bandwidth needs to be limited.
+ * @max_down: Maximum downstream bandwidth (Mb/s) available for the tunnel.
+ * Only set if the bandwidth needs to be limited.
+ * @allocated_up: Allocated upstream bandwidth (only for USB3)
+ * @allocated_down: Allocated downstream bandwidth (only for USB3)
*/
struct tb_tunnel {
struct tb *tb;
int (*activate)(struct tb_tunnel *tunnel, bool activate);
int (*consumed_bandwidth)(struct tb_tunnel *tunnel, int *consumed_up,
int *consumed_down);
+ int (*release_unused_bandwidth)(struct tb_tunnel *tunnel);
+ void (*reclaim_available_bandwidth)(struct tb_tunnel *tunnel,
+ int *available_up,
+ int *available_down);
struct list_head list;
enum tb_tunnel_type type;
- unsigned int max_bw;
+ int max_up;
+ int max_down;
+ int allocated_up;
+ int allocated_down;
};
struct tb_tunnel *tb_tunnel_discover_pci(struct tb *tb, struct tb_port *down);
struct tb_port *down);
struct tb_tunnel *tb_tunnel_discover_dp(struct tb *tb, struct tb_port *in);
struct tb_tunnel *tb_tunnel_alloc_dp(struct tb *tb, struct tb_port *in,
- struct tb_port *out, int max_bw);
+ struct tb_port *out, int max_up,
+ int max_down);
struct tb_tunnel *tb_tunnel_alloc_dma(struct tb *tb, struct tb_port *nhi,
struct tb_port *dst, int transmit_ring,
int transmit_path, int receive_ring,
int receive_path);
struct tb_tunnel *tb_tunnel_discover_usb3(struct tb *tb, struct tb_port *down);
struct tb_tunnel *tb_tunnel_alloc_usb3(struct tb *tb, struct tb_port *up,
- struct tb_port *down);
+ struct tb_port *down, int max_up,
+ int max_down);
void tb_tunnel_free(struct tb_tunnel *tunnel);
int tb_tunnel_activate(struct tb_tunnel *tunnel);
int tb_tunnel_restart(struct tb_tunnel *tunnel);
void tb_tunnel_deactivate(struct tb_tunnel *tunnel);
bool tb_tunnel_is_invalid(struct tb_tunnel *tunnel);
-bool tb_tunnel_switch_on_path(const struct tb_tunnel *tunnel,
- const struct tb_switch *sw);
+bool tb_tunnel_port_on_path(const struct tb_tunnel *tunnel,
+ const struct tb_port *port);
int tb_tunnel_consumed_bandwidth(struct tb_tunnel *tunnel, int *consumed_up,
int *consumed_down);
+int tb_tunnel_release_unused_bandwidth(struct tb_tunnel *tunnel);
+void tb_tunnel_reclaim_available_bandwidth(struct tb_tunnel *tunnel,
+ int *available_up,
+ int *available_down);
static inline bool tb_tunnel_is_pci(const struct tb_tunnel *tunnel)
{
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