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s390/qeth: add VNICC get/set timeout support
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HiperSockets allow configuring so called VNIC Characteristics (VNICC)
that influence how the underlying hardware handles packets. For VNICCs,
additional commands for getting and setting timeouts are available.
Currently, the learning VNICC uses these commands.

* Learning VNICC: If learning is enabled on a qeth device, the device
  learns the source MAC addresses of outgoing packets and incoming
  packets to those learned MAC addresses are received.

For learning, the timeout specifies the idle period in seconds, after
which the underlying hardware removes a learned MAC address again.

This patch adds support for the IPA commands that are required to get
and set the current timeout values for the learning VNIC characteristic.
Also, it introduces the sysfs interface that allows users to configure
the timeout.

Signed-off-by: Hans Wippel <hwippel@linux.vnet.ibm.com>
Reviewed-by: Julian Wiedmann <jwi@linux.vnet.ibm.com>
Signed-off-by: Julian Wiedmann <jwi@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Hans Wippel authored and David S. Miller committed Sep 18, 2017
1 parent caa1f0b commit 349d13d
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Showing 5 changed files with 190 additions and 5 deletions.
3 changes: 3 additions & 0 deletions drivers/s390/net/qeth_core.h
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Original file line number Diff line number Diff line change
Expand Up @@ -188,6 +188,9 @@ struct qeth_vnicc_info {
u32 cur_chars;
/* supported commands: bitmasks which VNICCs support respective cmd */
u32 set_char_sup;
u32 getset_timeout_sup;
/* timeout value for the learning characteristic */
u32 learning_timeout;
/* characteristics wanted/configured by user */
u32 wanted_chars;
/* has user explicitly enabled rx_bcast while online? */
Expand Down
11 changes: 11 additions & 0 deletions drivers/s390/net/qeth_core_mpc.h
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Original file line number Diff line number Diff line change
Expand Up @@ -562,6 +562,8 @@ struct qeth_ipacmd_diagass {
#define IPA_VNICC_QUERY_CMDS 0x00000001L
#define IPA_VNICC_ENABLE 0x00000002L
#define IPA_VNICC_DISABLE 0x00000004L
#define IPA_VNICC_SET_TIMEOUT 0x00000008L
#define IPA_VNICC_GET_TIMEOUT 0x00000010L

/* VNICC flags */
#define QETH_VNICC_FLOODING 0x80000000
Expand All @@ -575,6 +577,8 @@ struct qeth_ipacmd_diagass {
/* VNICC default values */
#define QETH_VNICC_ALL 0xff000000
#define QETH_VNICC_DEFAULT QETH_VNICC_RX_BCAST
/* default VNICC timeout in seconds */
#define QETH_VNICC_DEFAULT_TIMEOUT 600

/* VNICC header */
struct qeth_ipacmd_vnicc_hdr {
Expand All @@ -600,13 +604,20 @@ struct qeth_vnicc_set_char {
u32 vnic_char;
};

/* get/set timeout for VNIC characteristic */
struct qeth_vnicc_getset_timeout {
u32 vnic_char;
u32 timeout;
};

/* complete VNICC IPA command message */
struct qeth_ipacmd_vnicc {
struct qeth_ipacmd_vnicc_hdr hdr;
struct qeth_vnicc_sub_hdr sub_hdr;
union {
struct qeth_vnicc_query_cmds query_cmds;
struct qeth_vnicc_set_char set_char;
struct qeth_vnicc_getset_timeout getset_timeout;
};
};

Expand Down
2 changes: 2 additions & 0 deletions drivers/s390/net/qeth_l2.h
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Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,8 @@ void qeth_l2_setup_bridgeport_attrs(struct qeth_card *card);

int qeth_l2_vnicc_set_state(struct qeth_card *card, u32 vnicc, bool state);
int qeth_l2_vnicc_get_state(struct qeth_card *card, u32 vnicc, bool *state);
int qeth_l2_vnicc_set_timeout(struct qeth_card *card, u32 timeout);
int qeth_l2_vnicc_get_timeout(struct qeth_card *card, u32 *timeout);
bool qeth_l2_vnicc_is_in_use(struct qeth_card *card);

struct qeth_mac {
Expand Down
135 changes: 130 additions & 5 deletions drivers/s390/net/qeth_l2_main.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -35,6 +35,8 @@ static void qeth_bridge_host_event(struct qeth_card *card,
struct qeth_ipa_cmd *cmd);
static void qeth_l2_vnicc_set_defaults(struct qeth_card *card);
static void qeth_l2_vnicc_init(struct qeth_card *card);
static bool qeth_l2_vnicc_recover_timeout(struct qeth_card *card, u32 vnicc,
u32 *timeout);

static int qeth_l2_verify_dev(struct net_device *dev)
{
Expand Down Expand Up @@ -2096,9 +2098,13 @@ struct _qeth_l2_vnicc_request_cbctl {
u32 sub_cmd;
struct {
u32 vnic_char;
u32 timeout;
} param;
struct {
u32 *sup_cmds;
union{
u32 *sup_cmds;
u32 *timeout;
};
} result;
};

Expand All @@ -2122,6 +2128,9 @@ static int qeth_l2_vnicc_request_cb(struct qeth_card *card,
if (cbctl->sub_cmd == IPA_VNICC_QUERY_CMDS)
*cbctl->result.sup_cmds = rep->query_cmds.sup_cmds;

if (cbctl->sub_cmd == IPA_VNICC_GET_TIMEOUT)
*cbctl->result.timeout = rep->getset_timeout.timeout;

return 0;
}

Expand Down Expand Up @@ -2162,6 +2171,13 @@ static int qeth_l2_vnicc_request(struct qeth_card *card,
req->sub_hdr.data_length += sizeof(req->set_char);
req->set_char.vnic_char = cbctl->param.vnic_char;
break;
case IPA_VNICC_SET_TIMEOUT:
req->getset_timeout.timeout = cbctl->param.timeout;
/* fallthrough */
case IPA_VNICC_GET_TIMEOUT:
req->sub_hdr.data_length += sizeof(req->getset_timeout);
req->getset_timeout.vnic_char = cbctl->param.vnic_char;
break;
default:
qeth_release_buffer(iob->channel, iob);
return -EOPNOTSUPP;
Expand Down Expand Up @@ -2215,6 +2231,24 @@ static int qeth_l2_vnicc_set_char(struct qeth_card *card, u32 vnic_char,
return qeth_l2_vnicc_request(card, &cbctl);
}

/* VNICC get/set timeout for characteristic request */
static int qeth_l2_vnicc_getset_timeout(struct qeth_card *card, u32 vnicc,
u32 cmd, u32 *timeout)
{
struct _qeth_l2_vnicc_request_cbctl cbctl;

/* prepare callback control */
cbctl.sub_cmd = cmd;
cbctl.param.vnic_char = vnicc;
if (cmd == IPA_VNICC_SET_TIMEOUT)
cbctl.param.timeout = *timeout;
if (cmd == IPA_VNICC_GET_TIMEOUT)
cbctl.result.timeout = timeout;

QETH_CARD_TEXT(card, 2, "vniccgst");
return qeth_l2_vnicc_request(card, &cbctl);
}

/* set current VNICC flag state; called from sysfs store function */
int qeth_l2_vnicc_set_state(struct qeth_card *card, u32 vnicc, bool state)
{
Expand Down Expand Up @@ -2258,8 +2292,14 @@ int qeth_l2_vnicc_set_state(struct qeth_card *card, u32 vnicc, bool state)
if (rc)
card->options.vnicc.wanted_chars =
card->options.vnicc.cur_chars;
else if (state && vnicc == QETH_VNICC_RX_BCAST)
card->options.vnicc.rx_bcast_enabled = true;
else {
/* successful online VNICC change; handle special cases */
if (state && vnicc == QETH_VNICC_RX_BCAST)
card->options.vnicc.rx_bcast_enabled = true;
if (!state && vnicc == QETH_VNICC_LEARNING)
qeth_l2_vnicc_recover_timeout(card, vnicc,
&card->options.vnicc.learning_timeout);
}

return rc;
}
Expand Down Expand Up @@ -2287,6 +2327,70 @@ int qeth_l2_vnicc_get_state(struct qeth_card *card, u32 vnicc, bool *state)
return rc;
}

/* set VNICC timeout; called from sysfs store function. Currently, only learning
* supports timeout
*/
int qeth_l2_vnicc_set_timeout(struct qeth_card *card, u32 timeout)
{
int rc = 0;

QETH_CARD_TEXT(card, 2, "vniccsto");

/* do not change anything if BridgePort is enabled */
if (qeth_bridgeport_is_in_use(card))
return -EBUSY;

/* check if characteristic and set_timeout are supported */
if (!(card->options.vnicc.sup_chars & QETH_VNICC_LEARNING) ||
!(card->options.vnicc.getset_timeout_sup & QETH_VNICC_LEARNING))
return -EOPNOTSUPP;

/* do we need to do anything? */
if (card->options.vnicc.learning_timeout == timeout)
return rc;

/* if card is not ready, simply store the value internally and return */
if (!qeth_card_hw_is_reachable(card)) {
card->options.vnicc.learning_timeout = timeout;
return rc;
}

/* send timeout value to card; if successful, store value internally */
rc = qeth_l2_vnicc_getset_timeout(card, QETH_VNICC_LEARNING,
IPA_VNICC_SET_TIMEOUT, &timeout);
if (!rc)
card->options.vnicc.learning_timeout = timeout;

return rc;
}

/* get current VNICC timeout; called from sysfs show function. Currently, only
* learning supports timeout
*/
int qeth_l2_vnicc_get_timeout(struct qeth_card *card, u32 *timeout)
{
int rc = 0;

QETH_CARD_TEXT(card, 2, "vniccgto");

/* do not get anything if BridgePort is enabled */
if (qeth_bridgeport_is_in_use(card))
return -EBUSY;

/* check if characteristic and get_timeout are supported */
if (!(card->options.vnicc.sup_chars & QETH_VNICC_LEARNING) ||
!(card->options.vnicc.getset_timeout_sup & QETH_VNICC_LEARNING))
return -EOPNOTSUPP;
/* if card is ready, get timeout. Otherwise, just return stored value */
*timeout = card->options.vnicc.learning_timeout;
if (qeth_card_hw_is_reachable(card))
rc = qeth_l2_vnicc_getset_timeout(card, QETH_VNICC_LEARNING,
IPA_VNICC_GET_TIMEOUT,
timeout);

return rc;
}

/* check if VNICC is currently enabled */
bool qeth_l2_vnicc_is_in_use(struct qeth_card *card)
{
Expand All @@ -2304,6 +2408,19 @@ bool qeth_l2_vnicc_is_in_use(struct qeth_card *card)
return true;
}

/* recover user timeout setting */
static bool qeth_l2_vnicc_recover_timeout(struct qeth_card *card, u32 vnicc,
u32 *timeout)
{
if (card->options.vnicc.sup_chars & vnicc &&
card->options.vnicc.getset_timeout_sup & vnicc &&
!qeth_l2_vnicc_getset_timeout(card, vnicc, IPA_VNICC_SET_TIMEOUT,
timeout))
return false;
*timeout = QETH_VNICC_DEFAULT_TIMEOUT;
return true;
}

/* recover user characteristic setting */
static bool qeth_l2_vnicc_recover_char(struct qeth_card *card, u32 vnicc,
bool enable)
Expand All @@ -2322,6 +2439,7 @@ static bool qeth_l2_vnicc_recover_char(struct qeth_card *card, u32 vnicc,
/* (re-)initialize VNICC */
static void qeth_l2_vnicc_init(struct qeth_card *card)
{
u32 *timeout = &card->options.vnicc.learning_timeout;
unsigned int chars_len, i;
unsigned long chars_tmp;
u32 sup_cmds, vnicc;
Expand All @@ -2332,7 +2450,8 @@ static void qeth_l2_vnicc_init(struct qeth_card *card)
card->options.vnicc.rx_bcast_enabled = 0;
/* initial query and storage of VNIC characteristics */
if (qeth_l2_vnicc_query_chars(card)) {
if (card->options.vnicc.wanted_chars != QETH_VNICC_DEFAULT)
if (card->options.vnicc.wanted_chars != QETH_VNICC_DEFAULT ||
*timeout != QETH_VNICC_DEFAULT_TIMEOUT)
dev_err(&card->gdev->dev, "Configuring the VNIC characteristics failed\n");
/* fail quietly if user didn't change the default config */
card->options.vnicc.sup_chars = 0;
Expand All @@ -2346,12 +2465,16 @@ static void qeth_l2_vnicc_init(struct qeth_card *card)
for_each_set_bit(i, &chars_tmp, chars_len) {
vnicc = BIT(i);
qeth_l2_vnicc_query_cmds(card, vnicc, &sup_cmds);
if (!(sup_cmds & IPA_VNICC_SET_TIMEOUT) ||
!(sup_cmds & IPA_VNICC_GET_TIMEOUT))
card->options.vnicc.getset_timeout_sup &= ~vnicc;
if (!(sup_cmds & IPA_VNICC_ENABLE) ||
!(sup_cmds & IPA_VNICC_DISABLE))
card->options.vnicc.set_char_sup &= ~vnicc;
}
/* enforce assumed default values and recover settings, if changed */
error = false;
error = qeth_l2_vnicc_recover_timeout(card, QETH_VNICC_LEARNING,
timeout);
chars_tmp = card->options.vnicc.wanted_chars ^ QETH_VNICC_DEFAULT;
chars_tmp |= QETH_VNICC_BRIDGE_INVISIBLE;
chars_len = sizeof(card->options.vnicc.wanted_chars) * BITS_PER_BYTE;
Expand All @@ -2370,8 +2493,10 @@ static void qeth_l2_vnicc_set_defaults(struct qeth_card *card)
/* characteristics values */
card->options.vnicc.sup_chars = QETH_VNICC_ALL;
card->options.vnicc.cur_chars = QETH_VNICC_DEFAULT;
card->options.vnicc.learning_timeout = QETH_VNICC_DEFAULT_TIMEOUT;
/* supported commands */
card->options.vnicc.set_char_sup = QETH_VNICC_ALL;
card->options.vnicc.getset_timeout_sup = QETH_VNICC_LEARNING;
/* settings wanted by users */
card->options.vnicc.wanted_chars = QETH_VNICC_DEFAULT;
}
Expand Down
44 changes: 44 additions & 0 deletions drivers/s390/net/qeth_l2_sys.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -309,6 +309,47 @@ static u32 qeth_l2_vnicc_sysfs_attr_to_char(const char *attr_name)
return 0;
}

/* get current timeout setting */
static ssize_t qeth_vnicc_timeout_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct qeth_card *card = dev_get_drvdata(dev);
u32 timeout;
int rc;

if (!card)
return -EINVAL;

rc = qeth_l2_vnicc_get_timeout(card, &timeout);
if (rc == -EBUSY)
return sprintf(buf, "n/a (BridgePort)\n");
if (rc == -EOPNOTSUPP)
return sprintf(buf, "n/a\n");
return rc ? rc : sprintf(buf, "%d\n", timeout);
}

/* change timeout setting */
static ssize_t qeth_vnicc_timeout_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct qeth_card *card = dev_get_drvdata(dev);
u32 timeout;
int rc;

if (!card)
return -EINVAL;

rc = kstrtou32(buf, 10, &timeout);
if (rc)
return rc;

mutex_lock(&card->conf_mutex);
rc = qeth_l2_vnicc_set_timeout(card, timeout);
mutex_unlock(&card->conf_mutex);
return rc ? rc : count;
}

/* get current setting of characteristic */
static ssize_t qeth_vnicc_char_show(struct device *dev,
struct device_attribute *attr, char *buf)
Expand Down Expand Up @@ -359,6 +400,8 @@ static DEVICE_ATTR(flooding, 0644, qeth_vnicc_char_show, qeth_vnicc_char_store);
static DEVICE_ATTR(mcast_flooding, 0644, qeth_vnicc_char_show,
qeth_vnicc_char_store);
static DEVICE_ATTR(learning, 0644, qeth_vnicc_char_show, qeth_vnicc_char_store);
static DEVICE_ATTR(learning_timeout, 0644, qeth_vnicc_timeout_show,
qeth_vnicc_timeout_store);
static DEVICE_ATTR(takeover_setvmac, 0644, qeth_vnicc_char_show,
qeth_vnicc_char_store);
static DEVICE_ATTR(takeover_learning, 0644, qeth_vnicc_char_show,
Expand All @@ -371,6 +414,7 @@ static struct attribute *qeth_l2_vnicc_attrs[] = {
&dev_attr_flooding.attr,
&dev_attr_mcast_flooding.attr,
&dev_attr_learning.attr,
&dev_attr_learning_timeout.attr,
&dev_attr_takeover_setvmac.attr,
&dev_attr_takeover_learning.attr,
&dev_attr_bridge_invisible.attr,
Expand Down

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