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authorMika Westerberg <mika.westerberg@linux.intel.com>2019-03-21 19:03:00 +0200
committerMika Westerberg <mika.westerberg@linux.intel.com>2019-11-02 12:13:31 +0300
commit91c0c12080d0f40ee7275485221b06b4e1e289e1 (patch)
tree70e4119a7d77b11586f811906af5c8ab66ae7adc /drivers/thunderbolt/path.c
parentb5db76dba0642ea6f2391374f3b2b479014e5bf0 (diff)
thunderbolt: Add support for lane bonding
Lane bonding allows aggregating two 10/20 Gb/s (depending on the generation) lanes into a single 20/40 Gb/s bonded link. This allows sharing the full bandwidth more efficiently. In order to establish lane bonding we need to check that lane bonding is possible through link controller and that both ends of the link actually supports 2x widths. This also means that all the paths should be established through the primary port so update tb_path_alloc() to handle this as well. Lane bonding is supported starting from Falcon Ridge (2nd generation) controllers. We also expose the current speed and number of lanes under each device except the host router following similar attribute naming than USB bus. Expose speed and number of lanes for both directions to allow possibility of asymmetric link in the future. Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Diffstat (limited to 'drivers/thunderbolt/path.c')
-rw-r--r--drivers/thunderbolt/path.c30
1 files changed, 26 insertions, 4 deletions
diff --git a/drivers/thunderbolt/path.c b/drivers/thunderbolt/path.c
index afe5f8391ebf..6cf66597d5d8 100644
--- a/drivers/thunderbolt/path.c
+++ b/drivers/thunderbolt/path.c
@@ -220,7 +220,8 @@ err:
* Creates path between two ports starting with given @src_hopid. Reserves
* HopIDs for each port (they can be different from @src_hopid depending on
* how many HopIDs each port already have reserved). If there are dual
- * links on the path, prioritizes using @link_nr.
+ * links on the path, prioritizes using @link_nr but takes into account
+ * that the lanes may be bonded.
*
* Return: Returns a tb_path on success or NULL on failure.
*/
@@ -259,7 +260,9 @@ struct tb_path *tb_path_alloc(struct tb *tb, struct tb_port *src, int src_hopid,
if (!in_port)
goto err;
- if (in_port->dual_link_port && in_port->link_nr != link_nr)
+ /* When lanes are bonded primary link must be used */
+ if (!in_port->bonded && in_port->dual_link_port &&
+ in_port->link_nr != link_nr)
in_port = in_port->dual_link_port;
ret = tb_port_alloc_in_hopid(in_port, in_hopid, in_hopid);
@@ -271,8 +274,27 @@ struct tb_path *tb_path_alloc(struct tb *tb, struct tb_port *src, int src_hopid,
if (!out_port)
goto err;
- if (out_port->dual_link_port && out_port->link_nr != link_nr)
- out_port = out_port->dual_link_port;
+ /*
+ * Pick up right port when going from non-bonded to
+ * bonded or from bonded to non-bonded.
+ */
+ if (out_port->dual_link_port) {
+ if (!in_port->bonded && out_port->bonded &&
+ out_port->link_nr) {
+ /*
+ * Use primary link when going from
+ * non-bonded to bonded.
+ */
+ out_port = out_port->dual_link_port;
+ } else if (!out_port->bonded &&
+ out_port->link_nr != link_nr) {
+ /*
+ * If out port is not bonded follow
+ * link_nr.
+ */
+ out_port = out_port->dual_link_port;
+ }
+ }
if (i == num_hops - 1)
ret = tb_port_alloc_out_hopid(out_port, dst_hopid,