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Commit 7f37c426 authored by Kristian Høgsberg's avatar Kristian Høgsberg Committed by Stefan Richter
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firewire: Introduce a retry mechanism for reconnects and logins. 

Sometimes we reconnect too soon, sometimes too late.  Adding a retry
mechanism make the reconnect step much more robust.
Signed-off-by: default avatarKristian Høgsberg <krh@redhat.com>
Signed-off-by: default avatarStefan Richter <stefanr@s5r6.in-berlin.de>
parent 1d3d52c5
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Showing with 109 additions and 71 deletions
drivers/firewire/fw-sbp2.c
View file @ 7f37c426
......@@ -62,7 +62,8 @@ struct sbp2_device {
/* Timer for flushing ORBs. */
struct timer_list orb_timer;
struct work_struct work;
int retries;
struct delayed_work work;
struct Scsi_Host *scsi_host;
};
......@@ -511,6 +512,75 @@ static int sbp2_agent_reset(struct fw_unit *unit)
static int add_scsi_devices(struct fw_unit *unit);
static void remove_scsi_devices(struct fw_unit *unit);
static void sbp2_reconnect(struct work_struct *work);
static void sbp2_login(struct work_struct *work)
{
struct sbp2_device *sd =
container_of(work, struct sbp2_device, work.work);
struct fw_unit *unit = sd->unit;
struct fw_device *device = fw_device(unit->device.parent);
struct sbp2_login_response response;
int generation, node_id, local_node_id, lun, retval;
/* FIXME: Make this work for multi-lun devices. */
lun = 0;
generation = device->card->generation;
node_id = device->node->node_id;
local_node_id = device->card->local_node->node_id;
if (sbp2_send_management_orb(unit, node_id, generation,
SBP2_LOGIN_REQUEST, lun, &response) < 0) {
if (sd->retries++ < 5) {
fw_error("login attempt %d for %s failed, "
"rescheduling\n",
sd->retries, unit->device.bus_id);
schedule_delayed_work(&sd->work, DIV_ROUND_UP(HZ, 5));
} else {
fw_error("failed to login to %s\n",
unit->device.bus_id);
remove_scsi_devices(unit);
}
return;
}
sd->generation = generation;
sd->node_id = node_id;
sd->address_high = local_node_id << 16;
/* Get command block agent offset and login id. */
sd->command_block_agent_address =
((u64) response.command_block_agent.high << 32) |
response.command_block_agent.low;
sd->login_id = login_response_get_login_id(response);
fw_notify("logged in to sbp2 unit %s\n", unit->device.bus_id);
fw_notify(" - management_agent_address: 0x%012llx\n",
(unsigned long long) sd->management_agent_address);
fw_notify(" - command_block_agent_address: 0x%012llx\n",
(unsigned long long) sd->command_block_agent_address);
fw_notify(" - status write address: 0x%012llx\n",
(unsigned long long) sd->address_handler.offset);
#if 0
/* FIXME: The linux1394 sbp2 does this last step. */
sbp2_set_busy_timeout(scsi_id);
#endif
INIT_DELAYED_WORK(&sd->work, sbp2_reconnect);
sbp2_agent_reset(unit);
retval = add_scsi_devices(unit);
if (retval < 0) {
sbp2_send_management_orb(unit, sd->node_id, sd->generation,
SBP2_LOGOUT_REQUEST, sd->login_id,
NULL);
/* Set this back to sbp2_login so we fall back and
* retry login on bus reset. */
INIT_DELAYED_WORK(&sd->work, sbp2_login);
}
}
static int sbp2_probe(struct device *dev)
{
......@@ -518,9 +588,7 @@ static int sbp2_probe(struct device *dev)
struct fw_device *device = fw_device(unit->device.parent);
struct sbp2_device *sd;
struct fw_csr_iterator ci;
int i, key, value, lun, retval;
int node_id, generation, local_node_id;
struct sbp2_login_response response;
int i, key, value;
u32 model, firmware_revision;
sd = kzalloc(sizeof *sd, GFP_KERNEL);
......@@ -586,58 +654,10 @@ static int sbp2_probe(struct device *dev)
unit->device.bus_id,
sd->workarounds, firmware_revision, model);
/* FIXME: Make this work for multi-lun devices. */
lun = 0;
generation = device->card->generation;
node_id = device->node->node_id;
local_node_id = device->card->local_node->node_id;
/* FIXME: We should probably do this from a keventd callback
* and handle retries by rescheduling the work. */
if (sbp2_send_management_orb(unit, node_id, generation,
SBP2_LOGIN_REQUEST, lun, &response) < 0) {
fw_core_remove_address_handler(&sd->address_handler);
del_timer_sync(&sd->orb_timer);
kfree(sd);
return -EBUSY;
}
sd->generation = generation;
sd->node_id = node_id;
sd->address_high = local_node_id << 16;
/* Get command block agent offset and login id. */
sd->command_block_agent_address =
((u64) response.command_block_agent.high << 32) |
response.command_block_agent.low;
sd->login_id = login_response_get_login_id(response);
fw_notify("logged in to sbp2 unit %s\n", unit->device.bus_id);
fw_notify(" - management_agent_address: 0x%012llx\n",
(unsigned long long) sd->management_agent_address);
fw_notify(" - command_block_agent_address: 0x%012llx\n",
(unsigned long long) sd->command_block_agent_address);
fw_notify(" - status write address: 0x%012llx\n",
(unsigned long long) sd->address_handler.offset);
#if 0
/* FIXME: The linux1394 sbp2 does this last step. */
sbp2_set_busy_timeout(scsi_id);
#endif
sbp2_agent_reset(unit);
retval = add_scsi_devices(unit);
if (retval < 0) {
sbp2_send_management_orb(unit, sd->node_id, sd->generation,
SBP2_LOGOUT_REQUEST, sd->login_id,
NULL);
fw_core_remove_address_handler(&sd->address_handler);
del_timer_sync(&sd->orb_timer);
kfree(sd);
return retval;
}
/* We schedule work to do the login so we can easily
* reschedule retries. */
INIT_DELAYED_WORK(&sd->work, sbp2_login);
schedule_delayed_work(&sd->work, 0);
return 0;
}
......@@ -663,28 +683,41 @@ static int sbp2_remove(struct device *dev)
static void sbp2_reconnect(struct work_struct *work)
{
struct sbp2_device *sd = container_of(work, struct sbp2_device, work);
struct sbp2_device *sd =
container_of(work, struct sbp2_device, work.work);
struct fw_unit *unit = sd->unit;
struct fw_device *device = fw_device(unit->device.parent);
int generation, node_id, local_node_id;
fw_notify("in sbp2_reconnect, reconnecting to unit %s\n",
unit->device.bus_id);
generation = device->card->generation;
node_id = device->node->node_id;
local_node_id = device->card->local_node->node_id;
sbp2_send_management_orb(unit, node_id, generation,
SBP2_RECONNECT_REQUEST, sd->login_id, NULL);
/* FIXME: handle reconnect failures. */
sbp2_cancel_orbs(unit);
if (sbp2_send_management_orb(unit, node_id, generation,
SBP2_RECONNECT_REQUEST,
sd->login_id, NULL) < 0) {
if (sd->retries++ < 5) {
fw_error("reconnect attempt %d for %s failed, "
"rescheduling\n",
sd->retries, unit->device.bus_id);
} else {
fw_error("failed to reconnect to %s\n",
unit->device.bus_id);
/* Fall back and try to log in again. */
sd->retries = 0;
INIT_DELAYED_WORK(&sd->work, sbp2_login);
}
schedule_delayed_work(&sd->work, DIV_ROUND_UP(HZ, 5));
return;
}
sd->generation = generation;
sd->node_id = node_id;
sd->address_high = local_node_id << 16;
fw_notify("reconnected to unit %s\n", unit->device.bus_id);
sbp2_agent_reset(unit);
sbp2_cancel_orbs(unit);
}
static void sbp2_update(struct fw_unit *unit)
......@@ -692,10 +725,9 @@ static void sbp2_update(struct fw_unit *unit)
struct fw_device *device = fw_device(unit->device.parent);
struct sbp2_device *sd = unit->device.driver_data;
sd->retries = 0;
fw_device_enable_phys_dma(device);
INIT_WORK(&sd->work, sbp2_reconnect);
schedule_work(&sd->work);
schedule_delayed_work(&sd->work, 0);
}
#define SBP2_UNIT_SPEC_ID_ENTRY 0x0000609e
......@@ -1056,6 +1088,9 @@ static int add_scsi_devices(struct fw_unit *unit)
struct sbp2_device *sd = unit->device.driver_data;
int retval, lun;
if (sd->scsi_host != NULL)
return 0;
sd->scsi_host = scsi_host_alloc(&scsi_driver_template,
sizeof(unsigned long));
if (sd->scsi_host == NULL) {
......@@ -1088,8 +1123,11 @@ static void remove_scsi_devices(struct fw_unit *unit)
{
struct sbp2_device *sd = unit->device.driver_data;
scsi_remove_host(sd->scsi_host);
scsi_host_put(sd->scsi_host);
if (sd->scsi_host != NULL) {
scsi_remove_host(sd->scsi_host);
scsi_host_put(sd->scsi_host);
}
sd->scsi_host = NULL;
}
MODULE_AUTHOR("Kristian Hoegsberg <krh@bitplanet.net>");
......
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