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