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![Mika Westerberg](/assets/img/avatar_default.png)
This is useful when debugging possible issues during tunnel discovery. Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Tested-by: Brad Campbell <lists2009@fnarfbargle.com>
614 lines
16 KiB
C
614 lines
16 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Thunderbolt driver - path/tunnel functionality
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*
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* Copyright (c) 2014 Andreas Noever <andreas.noever@gmail.com>
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* Copyright (C) 2019, Intel Corporation
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*/
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include <linux/delay.h>
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#include <linux/ktime.h>
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#include "tb.h"
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static void tb_dump_hop(const struct tb_path_hop *hop, const struct tb_regs_hop *regs)
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{
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const struct tb_port *port = hop->in_port;
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tb_port_dbg(port, " In HopID: %d => Out port: %d Out HopID: %d\n",
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hop->in_hop_index, regs->out_port, regs->next_hop);
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tb_port_dbg(port, " Weight: %d Priority: %d Credits: %d Drop: %d\n",
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regs->weight, regs->priority,
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regs->initial_credits, regs->drop_packages);
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tb_port_dbg(port, " Counter enabled: %d Counter index: %d\n",
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regs->counter_enable, regs->counter);
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tb_port_dbg(port, " Flow Control (In/Eg): %d/%d Shared Buffer (In/Eg): %d/%d\n",
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regs->ingress_fc, regs->egress_fc,
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regs->ingress_shared_buffer, regs->egress_shared_buffer);
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tb_port_dbg(port, " Unknown1: %#x Unknown2: %#x Unknown3: %#x\n",
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regs->unknown1, regs->unknown2, regs->unknown3);
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}
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static struct tb_port *tb_path_find_dst_port(struct tb_port *src, int src_hopid,
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int dst_hopid)
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{
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struct tb_port *port, *out_port = NULL;
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struct tb_regs_hop hop;
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struct tb_switch *sw;
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int i, ret, hopid;
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hopid = src_hopid;
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port = src;
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for (i = 0; port && i < TB_PATH_MAX_HOPS; i++) {
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sw = port->sw;
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ret = tb_port_read(port, &hop, TB_CFG_HOPS, 2 * hopid, 2);
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if (ret) {
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tb_port_warn(port, "failed to read path at %d\n", hopid);
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return NULL;
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}
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if (!hop.enable)
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return NULL;
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out_port = &sw->ports[hop.out_port];
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hopid = hop.next_hop;
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port = out_port->remote;
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}
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return out_port && hopid == dst_hopid ? out_port : NULL;
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}
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static int tb_path_find_src_hopid(struct tb_port *src,
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const struct tb_port *dst, int dst_hopid)
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{
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struct tb_port *out;
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int i;
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for (i = TB_PATH_MIN_HOPID; i <= src->config.max_in_hop_id; i++) {
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out = tb_path_find_dst_port(src, i, dst_hopid);
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if (out == dst)
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return i;
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}
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return 0;
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}
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/**
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* tb_path_discover() - Discover a path
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* @src: First input port of a path
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* @src_hopid: Starting HopID of a path (%-1 if don't care)
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* @dst: Expected destination port of the path (%NULL if don't care)
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* @dst_hopid: HopID to the @dst (%-1 if don't care)
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* @last: Last port is filled here if not %NULL
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* @name: Name of the path
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* @alloc_hopid: Allocate HopIDs for the ports
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*
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* Follows a path starting from @src and @src_hopid to the last output
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* port of the path. Allocates HopIDs for the visited ports (if
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* @alloc_hopid is true). Call tb_path_free() to release the path and
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* allocated HopIDs when the path is not needed anymore.
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*
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* Note function discovers also incomplete paths so caller should check
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* that the @dst port is the expected one. If it is not, the path can be
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* cleaned up by calling tb_path_deactivate() before tb_path_free().
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*
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* Return: Discovered path on success, %NULL in case of failure
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*/
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struct tb_path *tb_path_discover(struct tb_port *src, int src_hopid,
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struct tb_port *dst, int dst_hopid,
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struct tb_port **last, const char *name,
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bool alloc_hopid)
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{
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struct tb_port *out_port;
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struct tb_regs_hop hop;
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struct tb_path *path;
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struct tb_switch *sw;
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struct tb_port *p;
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size_t num_hops;
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int ret, i, h;
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if (src_hopid < 0 && dst) {
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/*
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* For incomplete paths the intermediate HopID can be
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* different from the one used by the protocol adapter
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* so in that case find a path that ends on @dst with
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* matching @dst_hopid. That should give us the correct
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* HopID for the @src.
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*/
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src_hopid = tb_path_find_src_hopid(src, dst, dst_hopid);
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if (!src_hopid)
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return NULL;
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}
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p = src;
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h = src_hopid;
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num_hops = 0;
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for (i = 0; p && i < TB_PATH_MAX_HOPS; i++) {
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sw = p->sw;
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ret = tb_port_read(p, &hop, TB_CFG_HOPS, 2 * h, 2);
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if (ret) {
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tb_port_warn(p, "failed to read path at %d\n", h);
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return NULL;
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}
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/* If the hop is not enabled we got an incomplete path */
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if (!hop.enable)
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break;
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out_port = &sw->ports[hop.out_port];
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if (last)
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*last = out_port;
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h = hop.next_hop;
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p = out_port->remote;
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num_hops++;
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}
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path = kzalloc(sizeof(*path), GFP_KERNEL);
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if (!path)
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return NULL;
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path->name = name;
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path->tb = src->sw->tb;
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path->path_length = num_hops;
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path->activated = true;
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path->alloc_hopid = alloc_hopid;
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path->hops = kcalloc(num_hops, sizeof(*path->hops), GFP_KERNEL);
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if (!path->hops) {
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kfree(path);
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return NULL;
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}
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tb_dbg(path->tb, "discovering %s path starting from %llx:%u\n",
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path->name, tb_route(src->sw), src->port);
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p = src;
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h = src_hopid;
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for (i = 0; i < num_hops; i++) {
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int next_hop;
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sw = p->sw;
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ret = tb_port_read(p, &hop, TB_CFG_HOPS, 2 * h, 2);
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if (ret) {
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tb_port_warn(p, "failed to read path at %d\n", h);
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goto err;
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}
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if (alloc_hopid && tb_port_alloc_in_hopid(p, h, h) < 0)
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goto err;
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out_port = &sw->ports[hop.out_port];
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next_hop = hop.next_hop;
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if (alloc_hopid &&
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tb_port_alloc_out_hopid(out_port, next_hop, next_hop) < 0) {
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tb_port_release_in_hopid(p, h);
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goto err;
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}
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path->hops[i].in_port = p;
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path->hops[i].in_hop_index = h;
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path->hops[i].in_counter_index = -1;
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path->hops[i].out_port = out_port;
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path->hops[i].next_hop_index = next_hop;
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tb_dump_hop(&path->hops[i], &hop);
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h = next_hop;
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p = out_port->remote;
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}
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tb_dbg(path->tb, "path discovery complete\n");
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return path;
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err:
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tb_port_warn(src, "failed to discover path starting at HopID %d\n",
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src_hopid);
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tb_path_free(path);
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return NULL;
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}
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/**
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* tb_path_alloc() - allocate a thunderbolt path between two ports
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* @tb: Domain pointer
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* @src: Source port of the path
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* @src_hopid: HopID used for the first ingress port in the path
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* @dst: Destination port of the path
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* @dst_hopid: HopID used for the last egress port in the path
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* @link_nr: Preferred link if there are dual links on the path
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* @name: Name of the path
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*
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* Creates path between two ports starting with given @src_hopid. Reserves
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* HopIDs for each port (they can be different from @src_hopid depending on
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* how many HopIDs each port already have reserved). If there are dual
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* links on the path, prioritizes using @link_nr but takes into account
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* that the lanes may be bonded.
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*
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* Return: Returns a tb_path on success or NULL on failure.
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*/
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struct tb_path *tb_path_alloc(struct tb *tb, struct tb_port *src, int src_hopid,
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struct tb_port *dst, int dst_hopid, int link_nr,
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const char *name)
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{
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struct tb_port *in_port, *out_port, *first_port, *last_port;
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int in_hopid, out_hopid;
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struct tb_path *path;
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size_t num_hops;
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int i, ret;
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path = kzalloc(sizeof(*path), GFP_KERNEL);
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if (!path)
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return NULL;
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first_port = last_port = NULL;
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i = 0;
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tb_for_each_port_on_path(src, dst, in_port) {
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if (!first_port)
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first_port = in_port;
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last_port = in_port;
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i++;
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}
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/* Check that src and dst are reachable */
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if (first_port != src || last_port != dst) {
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kfree(path);
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return NULL;
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}
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/* Each hop takes two ports */
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num_hops = i / 2;
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path->hops = kcalloc(num_hops, sizeof(*path->hops), GFP_KERNEL);
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if (!path->hops) {
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kfree(path);
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return NULL;
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}
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path->alloc_hopid = true;
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in_hopid = src_hopid;
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out_port = NULL;
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for (i = 0; i < num_hops; i++) {
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in_port = tb_next_port_on_path(src, dst, out_port);
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if (!in_port)
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goto err;
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/* When lanes are bonded primary link must be used */
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if (!in_port->bonded && in_port->dual_link_port &&
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in_port->link_nr != link_nr)
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in_port = in_port->dual_link_port;
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ret = tb_port_alloc_in_hopid(in_port, in_hopid, in_hopid);
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if (ret < 0)
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goto err;
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in_hopid = ret;
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out_port = tb_next_port_on_path(src, dst, in_port);
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if (!out_port)
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goto err;
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/*
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* Pick up right port when going from non-bonded to
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* bonded or from bonded to non-bonded.
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*/
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if (out_port->dual_link_port) {
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if (!in_port->bonded && out_port->bonded &&
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out_port->link_nr) {
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/*
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* Use primary link when going from
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* non-bonded to bonded.
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*/
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out_port = out_port->dual_link_port;
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} else if (!out_port->bonded &&
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out_port->link_nr != link_nr) {
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/*
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* If out port is not bonded follow
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* link_nr.
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*/
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out_port = out_port->dual_link_port;
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}
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}
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if (i == num_hops - 1)
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ret = tb_port_alloc_out_hopid(out_port, dst_hopid,
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dst_hopid);
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else
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ret = tb_port_alloc_out_hopid(out_port, -1, -1);
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if (ret < 0)
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goto err;
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out_hopid = ret;
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path->hops[i].in_hop_index = in_hopid;
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path->hops[i].in_port = in_port;
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path->hops[i].in_counter_index = -1;
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path->hops[i].out_port = out_port;
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path->hops[i].next_hop_index = out_hopid;
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in_hopid = out_hopid;
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}
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path->tb = tb;
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path->path_length = num_hops;
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path->name = name;
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return path;
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err:
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tb_path_free(path);
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return NULL;
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}
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/**
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* tb_path_free() - free a path
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* @path: Path to free
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*
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* Frees a path. The path does not need to be deactivated.
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*/
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void tb_path_free(struct tb_path *path)
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{
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if (path->alloc_hopid) {
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int i;
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for (i = 0; i < path->path_length; i++) {
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const struct tb_path_hop *hop = &path->hops[i];
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if (hop->in_port)
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tb_port_release_in_hopid(hop->in_port,
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hop->in_hop_index);
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if (hop->out_port)
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tb_port_release_out_hopid(hop->out_port,
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hop->next_hop_index);
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}
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}
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kfree(path->hops);
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kfree(path);
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}
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static void __tb_path_deallocate_nfc(struct tb_path *path, int first_hop)
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{
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int i, res;
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for (i = first_hop; i < path->path_length; i++) {
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res = tb_port_add_nfc_credits(path->hops[i].in_port,
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-path->hops[i].nfc_credits);
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if (res)
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tb_port_warn(path->hops[i].in_port,
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"nfc credits deallocation failed for hop %d\n",
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i);
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}
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}
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static int __tb_path_deactivate_hop(struct tb_port *port, int hop_index,
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bool clear_fc)
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{
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struct tb_regs_hop hop;
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ktime_t timeout;
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int ret;
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/* Disable the path */
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ret = tb_port_read(port, &hop, TB_CFG_HOPS, 2 * hop_index, 2);
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if (ret)
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return ret;
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/* Already disabled */
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if (!hop.enable)
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return 0;
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hop.enable = 0;
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ret = tb_port_write(port, &hop, TB_CFG_HOPS, 2 * hop_index, 2);
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if (ret)
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return ret;
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/* Wait until it is drained */
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timeout = ktime_add_ms(ktime_get(), 500);
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do {
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ret = tb_port_read(port, &hop, TB_CFG_HOPS, 2 * hop_index, 2);
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if (ret)
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return ret;
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if (!hop.pending) {
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if (clear_fc) {
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/*
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* Clear flow control. Protocol adapters
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* IFC and ISE bits are vendor defined
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* in the USB4 spec so we clear them
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* only for pre-USB4 adapters.
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*/
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if (!tb_switch_is_usb4(port->sw)) {
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hop.ingress_fc = 0;
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hop.ingress_shared_buffer = 0;
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}
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hop.egress_fc = 0;
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hop.egress_shared_buffer = 0;
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return tb_port_write(port, &hop, TB_CFG_HOPS,
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2 * hop_index, 2);
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}
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return 0;
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}
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usleep_range(10, 20);
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} while (ktime_before(ktime_get(), timeout));
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return -ETIMEDOUT;
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}
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static void __tb_path_deactivate_hops(struct tb_path *path, int first_hop)
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{
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int i, res;
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for (i = first_hop; i < path->path_length; i++) {
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res = __tb_path_deactivate_hop(path->hops[i].in_port,
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path->hops[i].in_hop_index,
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path->clear_fc);
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if (res && res != -ENODEV)
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tb_port_warn(path->hops[i].in_port,
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"hop deactivation failed for hop %d, index %d\n",
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i, path->hops[i].in_hop_index);
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}
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}
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void tb_path_deactivate(struct tb_path *path)
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{
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if (!path->activated) {
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tb_WARN(path->tb, "trying to deactivate an inactive path\n");
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return;
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}
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tb_dbg(path->tb,
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"deactivating %s path from %llx:%u to %llx:%u\n",
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path->name, tb_route(path->hops[0].in_port->sw),
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path->hops[0].in_port->port,
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tb_route(path->hops[path->path_length - 1].out_port->sw),
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path->hops[path->path_length - 1].out_port->port);
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__tb_path_deactivate_hops(path, 0);
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__tb_path_deallocate_nfc(path, 0);
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path->activated = false;
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}
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/**
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* tb_path_activate() - activate a path
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* @path: Path to activate
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*
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* Activate a path starting with the last hop and iterating backwards. The
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* caller must fill path->hops before calling tb_path_activate().
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*
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* Return: Returns 0 on success or an error code on failure.
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*/
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int tb_path_activate(struct tb_path *path)
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{
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int i, res;
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enum tb_path_port out_mask, in_mask;
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if (path->activated) {
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tb_WARN(path->tb, "trying to activate already activated path\n");
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return -EINVAL;
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}
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tb_dbg(path->tb,
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"activating %s path from %llx:%u to %llx:%u\n",
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path->name, tb_route(path->hops[0].in_port->sw),
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path->hops[0].in_port->port,
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tb_route(path->hops[path->path_length - 1].out_port->sw),
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path->hops[path->path_length - 1].out_port->port);
|
|
|
|
/* Clear counters. */
|
|
for (i = path->path_length - 1; i >= 0; i--) {
|
|
if (path->hops[i].in_counter_index == -1)
|
|
continue;
|
|
res = tb_port_clear_counter(path->hops[i].in_port,
|
|
path->hops[i].in_counter_index);
|
|
if (res)
|
|
goto err;
|
|
}
|
|
|
|
/* Add non flow controlled credits. */
|
|
for (i = path->path_length - 1; i >= 0; i--) {
|
|
res = tb_port_add_nfc_credits(path->hops[i].in_port,
|
|
path->hops[i].nfc_credits);
|
|
if (res) {
|
|
__tb_path_deallocate_nfc(path, i);
|
|
goto err;
|
|
}
|
|
}
|
|
|
|
/* Activate hops. */
|
|
for (i = path->path_length - 1; i >= 0; i--) {
|
|
struct tb_regs_hop hop = { 0 };
|
|
|
|
/* If it is left active deactivate it first */
|
|
__tb_path_deactivate_hop(path->hops[i].in_port,
|
|
path->hops[i].in_hop_index, path->clear_fc);
|
|
|
|
/* dword 0 */
|
|
hop.next_hop = path->hops[i].next_hop_index;
|
|
hop.out_port = path->hops[i].out_port->port;
|
|
hop.initial_credits = path->hops[i].initial_credits;
|
|
hop.unknown1 = 0;
|
|
hop.enable = 1;
|
|
|
|
/* dword 1 */
|
|
out_mask = (i == path->path_length - 1) ?
|
|
TB_PATH_DESTINATION : TB_PATH_INTERNAL;
|
|
in_mask = (i == 0) ? TB_PATH_SOURCE : TB_PATH_INTERNAL;
|
|
hop.weight = path->weight;
|
|
hop.unknown2 = 0;
|
|
hop.priority = path->priority;
|
|
hop.drop_packages = path->drop_packages;
|
|
hop.counter = path->hops[i].in_counter_index;
|
|
hop.counter_enable = path->hops[i].in_counter_index != -1;
|
|
hop.ingress_fc = path->ingress_fc_enable & in_mask;
|
|
hop.egress_fc = path->egress_fc_enable & out_mask;
|
|
hop.ingress_shared_buffer = path->ingress_shared_buffer
|
|
& in_mask;
|
|
hop.egress_shared_buffer = path->egress_shared_buffer
|
|
& out_mask;
|
|
hop.unknown3 = 0;
|
|
|
|
tb_port_dbg(path->hops[i].in_port, "Writing hop %d\n", i);
|
|
tb_dump_hop(&path->hops[i], &hop);
|
|
res = tb_port_write(path->hops[i].in_port, &hop, TB_CFG_HOPS,
|
|
2 * path->hops[i].in_hop_index, 2);
|
|
if (res) {
|
|
__tb_path_deactivate_hops(path, i);
|
|
__tb_path_deallocate_nfc(path, 0);
|
|
goto err;
|
|
}
|
|
}
|
|
path->activated = true;
|
|
tb_dbg(path->tb, "path activation complete\n");
|
|
return 0;
|
|
err:
|
|
tb_WARN(path->tb, "path activation failed\n");
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* tb_path_is_invalid() - check whether any ports on the path are invalid
|
|
* @path: Path to check
|
|
*
|
|
* Return: Returns true if the path is invalid, false otherwise.
|
|
*/
|
|
bool tb_path_is_invalid(struct tb_path *path)
|
|
{
|
|
int i = 0;
|
|
for (i = 0; i < path->path_length; i++) {
|
|
if (path->hops[i].in_port->sw->is_unplugged)
|
|
return true;
|
|
if (path->hops[i].out_port->sw->is_unplugged)
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* tb_path_port_on_path() - Does the path go through certain port
|
|
* @path: Path to check
|
|
* @port: Switch to check
|
|
*
|
|
* Goes over all hops on path and checks if @port is any of them.
|
|
* Direction does not matter.
|
|
*/
|
|
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 == port ||
|
|
path->hops[i].out_port == port)
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|