diff mbox series

[1/2] thunderbolt: Fix calculation of consumed USB3 bandwidth on a path

Message ID 20240408130031.51616-1-mika.westerberg@linux.intel.com (mailing list archive)
State New
Headers show
Series [1/2] thunderbolt: Fix calculation of consumed USB3 bandwidth on a path | expand

Commit Message

Mika Westerberg April 8, 2024, 1 p.m. UTC 
From: Gil Fine <gil.fine@linux.intel.com>

Currently, when setup a new USB3 tunnel that is starting from downstream USB3
adapter of first depth router (or deeper), to upstream USB3 adapter of a second
depth router (or deeper), we calculate consumed bandwidth. For this calculation
we take into account first USB3 tunnel consumed bandwidth while we shouldn't,
because we just recalculating the first USB3 tunnel allocated bandwidth.

Fix that, so that more bandwidth is available for the new USB3 tunnel being
setup.

While there, fix the kernel-doc to decribe more accurately the purpose of the
function.

Signed-off-by: Gil Fine <gil.fine@linux.intel.com>
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
---
 drivers/thunderbolt/tb.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

Comments

Mika Westerberg April 12, 2024, 6:51 a.m. UTC | #1 
On Mon, Apr 08, 2024 at 04:00:30PM +0300, Mika Westerberg wrote:
> From: Gil Fine <gil.fine@linux.intel.com>
> 
> Currently, when setup a new USB3 tunnel that is starting from downstream USB3
> adapter of first depth router (or deeper), to upstream USB3 adapter of a second
> depth router (or deeper), we calculate consumed bandwidth. For this calculation
> we take into account first USB3 tunnel consumed bandwidth while we shouldn't,
> because we just recalculating the first USB3 tunnel allocated bandwidth.
> 
> Fix that, so that more bandwidth is available for the new USB3 tunnel being
> setup.
> 
> While there, fix the kernel-doc to decribe more accurately the purpose of the
> function.
> 
> Signed-off-by: Gil Fine <gil.fine@linux.intel.com>
> Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>

Both applied to thunderbolt.git/next.
diff mbox series

Patch

diff --git a/drivers/thunderbolt/tb.c b/drivers/thunderbolt/tb.c
index 3e44c78ac409..10e719dd837c 100644
--- a/drivers/thunderbolt/tb.c
+++ b/drivers/thunderbolt/tb.c
@@ -498,8 +498,9 @@  static struct tb_tunnel *tb_find_first_usb3_tunnel(struct tb *tb,
  * @consumed_down: Consumed downstream bandwidth (Mb/s)
  *
  * Calculates consumed USB3 and PCIe bandwidth at @port between path
- * from @src_port to @dst_port. Does not take tunnel starting from
- * @src_port and ending from @src_port into account.
+ * from @src_port to @dst_port. Does not take USB3 tunnel starting from
+ * @src_port and ending on @src_port into account because that bandwidth is
+ * already included in as part of the "first hop" USB3 tunnel.
  */
 static int tb_consumed_usb3_pcie_bandwidth(struct tb *tb,
 					   struct tb_port *src_port,
@@ -514,8 +515,8 @@  static int tb_consumed_usb3_pcie_bandwidth(struct tb *tb,
 	*consumed_up = *consumed_down = 0;
 
 	tunnel = tb_find_first_usb3_tunnel(tb, src_port, dst_port);
-	if (tunnel && tunnel->src_port != src_port &&
-	    tunnel->dst_port != dst_port) {
+	if (tunnel && !tb_port_is_usb3_down(src_port) &&
+	    !tb_port_is_usb3_up(dst_port)) {
 		int ret;
 
 		ret = tb_tunnel_consumed_bandwidth(tunnel, consumed_up,