From 09840f70b088df1ec24f9b4e345983e7d5f63628 Mon Sep 17 00:00:00 2001
From: Julian Wiedmann
Date: Tue, 17 Nov 2020 17:15:13 +0100
Subject: s390/qeth: reduce rtnl locking for switchdev events

call_switchdev_notifiers() doesn't require holding the RTNL lock since
commit ff5cf100110c ("net: switchdev: Change notifier chain to be atomic").

We still need it for the "lost event" slow path, to avoid racing against
a concurrent .ndo_bridge_setlink().

Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Reviewed-by: Alexandra Winter <wintera@linux.ibm.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
 drivers/s390/net/qeth_l2_main.c | 33 +++++++++++++++------------------
 1 file changed, 15 insertions(+), 18 deletions(-)

(limited to 'drivers/s390')

diff --git a/drivers/s390/net/qeth_l2_main.c b/drivers/s390/net/qeth_l2_main.c
index 28f6dda95736..daeb837abec3 100644
--- a/drivers/s390/net/qeth_l2_main.c
+++ b/drivers/s390/net/qeth_l2_main.c
@@ -737,8 +737,6 @@ static void qeth_l2_dev2br_an_set_cb(void *priv,
  *
  *	On enable, emits a series of address notifications for all
  *	currently registered hosts.
- *
- *	Must be called under rtnl_lock
  */
 static int qeth_l2_dev2br_an_set(struct qeth_card *card, bool enable)
 {
@@ -1289,16 +1287,19 @@ static void qeth_l2_dev2br_worker(struct work_struct *work)
 	if (READ_ONCE(card->info.pnso_mode) == QETH_PNSO_NONE)
 		goto free;
 
-	/* Potential re-config in progress, try again later: */
-	if (!rtnl_trylock()) {
-		queue_delayed_work(card->event_wq, dwork,
-				   msecs_to_jiffies(100));
-		return;
-	}
-	if (!netif_device_present(card->dev))
-		goto out_unlock;
-
 	if (data->ac_event.lost_event_mask) {
+		/* Potential re-config in progress, try again later: */
+		if (!rtnl_trylock()) {
+			queue_delayed_work(card->event_wq, dwork,
+					   msecs_to_jiffies(100));
+			return;
+		}
+
+		if (!netif_device_present(card->dev)) {
+			rtnl_unlock();
+			goto free;
+		}
+
 		QETH_DBF_MESSAGE(3,
 				 "Address change notification overflow on device %x\n",
 				 CARD_DEVID(card));
@@ -1328,6 +1329,8 @@ static void qeth_l2_dev2br_worker(struct work_struct *work)
 					 "Address Notification resynced on device %x\n",
 					 CARD_DEVID(card));
 		}
+
+		rtnl_unlock();
 	} else {
 		for (i = 0; i < data->ac_event.num_entries; i++) {
 			struct qeth_ipacmd_addr_change_entry *entry =
@@ -1339,9 +1342,6 @@ static void qeth_l2_dev2br_worker(struct work_struct *work)
 		}
 	}
 
-out_unlock:
-	rtnl_unlock();
-
 free:
 	kfree(data);
 }
@@ -2310,11 +2310,8 @@ static void qeth_l2_set_offline(struct qeth_card *card)
 		card->state = CARD_STATE_DOWN;
 
 	qeth_l2_set_pnso_mode(card, QETH_PNSO_NONE);
-	if (priv->brport_features & BR_LEARNING_SYNC) {
-		rtnl_lock();
+	if (priv->brport_features & BR_LEARNING_SYNC)
 		qeth_l2_dev2br_fdb_flush(card);
-		rtnl_unlock();
-	}
 }
 
 /* Returns zero if the command is successfully "consumed" */
-- 
cgit v1.2.3


From 215d2836d714dbc1f52c7d14c6c1716bd4f4ff7b Mon Sep 17 00:00:00 2001
From: Kaixu Xia
Date: Tue, 17 Nov 2020 17:15:14 +0100
Subject: s390/qeth: remove useless if/else

Fix the following coccinelle report:

./drivers/s390/net/qeth_l3_main.c:107:2-4: WARNING: possible condition with no effect (if == else)

Both branches are the same since
commit ab29c480b194 ("s390/qeth: replace deprecated simple_stroul()"),
so remove them.

Reported-by: Tosk Robot <tencent_os_robot@tencent.com>
Signed-off-by: Kaixu Xia <kaixuxia@tencent.com>
[jwi: point to the commit that introduced this]
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
 drivers/s390/net/qeth_l3_main.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

(limited to 'drivers/s390')

diff --git a/drivers/s390/net/qeth_l3_main.c b/drivers/s390/net/qeth_l3_main.c
index b1c1d2510d55..264b6c782382 100644
--- a/drivers/s390/net/qeth_l3_main.c
+++ b/drivers/s390/net/qeth_l3_main.c
@@ -104,10 +104,7 @@ static bool qeth_l3_is_addr_covered_by_ipato(struct qeth_card *card,
 		qeth_l3_convert_addr_to_bits(ipatoe->addr, ipatoe_bits,
 					  (ipatoe->proto == QETH_PROT_IPV4) ?
 					  4 : 16);
-		if (addr->proto == QETH_PROT_IPV4)
-			rc = !memcmp(addr_bits, ipatoe_bits, ipatoe->mask_bits);
-		else
-			rc = !memcmp(addr_bits, ipatoe_bits, ipatoe->mask_bits);
+		rc = !memcmp(addr_bits, ipatoe_bits, ipatoe->mask_bits);
 		if (rc)
 			break;
 	}
-- 
cgit v1.2.3


From 88ad4d9bb16624e6ea81aac9fb83dc34cd12460f Mon Sep 17 00:00:00 2001
From: Julian Wiedmann
Date: Tue, 17 Nov 2020 17:15:15 +0100
Subject: s390/qeth: tolerate error when querying card info

By the time that our .get_link_ksettings() code issues a QUERY CARD INFO
cmd to get link-related information, we already set up a good amount of
static link data.

Return this data when the cmd fails, same as when the cmd is not
supported.

Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
 drivers/s390/net/qeth_ethtool.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

(limited to 'drivers/s390')

diff --git a/drivers/s390/net/qeth_ethtool.c b/drivers/s390/net/qeth_ethtool.c
index b5caa723326e..b843df2c14b1 100644
--- a/drivers/s390/net/qeth_ethtool.c
+++ b/drivers/s390/net/qeth_ethtool.c
@@ -413,7 +413,6 @@ static int qeth_get_link_ksettings(struct net_device *netdev,
 	struct qeth_card *card = netdev->ml_priv;
 	enum qeth_link_types link_type;
 	struct carrier_info carrier_info;
-	int rc;
 
 	if (IS_IQD(card) || IS_VM_NIC(card))
 		link_type = QETH_LINK_TYPE_10GBIT_ETH;
@@ -455,12 +454,8 @@ static int qeth_get_link_ksettings(struct net_device *netdev,
 	/* Check if we can obtain more accurate information.	 */
 	/* If QUERY_CARD_INFO command is not supported or fails, */
 	/* just return the heuristics that was filled above.	 */
-	rc = qeth_query_card_info(card, &carrier_info);
-	if (rc == -EOPNOTSUPP) /* for old hardware, return heuristic */
+	if (qeth_query_card_info(card, &carrier_info))
 		return 0;
-	if (rc) /* report error from the hardware operation */
-		return rc;
-	/* on success, fill in the information got from the hardware */
 
 	netdev_dbg(netdev,
 	"card info: card_type=0x%02x, port_mode=0x%04x, port_speed=0x%08x\n",
-- 
cgit v1.2.3


From 4139b2b138dd44ca215976a06846839774ca7cd4 Mon Sep 17 00:00:00 2001
From: Julian Wiedmann
Date: Tue, 17 Nov 2020 17:15:16 +0100
Subject: s390/qeth: improve QUERY CARD INFO processing

Move all the HW reply data parsing into qeth_query_card_info_cb(), and
use common ethtool enums for transporting the information back to the
caller.

Also only look at the .port_speed field when we couldn't determine the
speed from the .card_type field, and introduce some 'default' cases for
SPEED_UNKNOWN, PORT_OTHER and DUPLEX_UNKNOWN.

Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
 drivers/s390/net/qeth_core.h      | 14 ++++----
 drivers/s390/net/qeth_core_main.c | 67 +++++++++++++++++++++++++++++++----
 drivers/s390/net/qeth_ethtool.c   | 74 +++++++--------------------------------
 3 files changed, 79 insertions(+), 76 deletions(-)

(limited to 'drivers/s390')

diff --git a/drivers/s390/net/qeth_core.h b/drivers/s390/net/qeth_core.h
index f73b4756ed5e..a4db7684d084 100644
--- a/drivers/s390/net/qeth_core.h
+++ b/drivers/s390/net/qeth_core.h
@@ -701,6 +701,12 @@ enum qeth_pnso_mode {
 	QETH_PNSO_ADDR_INFO,
 };
 
+struct qeth_link_info {
+	u32 speed;
+	u8 duplex;
+	u8 port;
+};
+
 #define QETH_BROADCAST_WITH_ECHO    0x01
 #define QETH_BROADCAST_WITHOUT_ECHO 0x02
 struct qeth_card_info {
@@ -796,12 +802,6 @@ struct qeth_rx {
 	u8 bufs_refill;
 };
 
-struct carrier_info {
-	__u8  card_type;
-	__u16 port_mode;
-	__u32 port_speed;
-};
-
 struct qeth_switch_info {
 	__u32 capabilities;
 	__u32 settings;
@@ -1108,7 +1108,7 @@ void qeth_prepare_ipa_cmd(struct qeth_card *card, struct qeth_cmd_buffer *iob,
 int qeth_query_switch_attributes(struct qeth_card *card,
 				  struct qeth_switch_info *sw_info);
 int qeth_query_card_info(struct qeth_card *card,
-			 struct carrier_info *carrier_info);
+			 struct qeth_link_info *link_info);
 int qeth_setadpparms_set_access_ctrl(struct qeth_card *card,
 				     enum qeth_ipa_isolation_modes mode);
 
diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
index 93c9b30ab17a..39530f8e477f 100644
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -4868,8 +4868,8 @@ out_free:
 static int qeth_query_card_info_cb(struct qeth_card *card,
 				   struct qeth_reply *reply, unsigned long data)
 {
-	struct carrier_info *carrier_info = (struct carrier_info *)reply->param;
 	struct qeth_ipa_cmd *cmd = (struct qeth_ipa_cmd *)data;
+	struct qeth_link_info *link_info = reply->param;
 	struct qeth_query_card_info *card_info;
 
 	QETH_CARD_TEXT(card, 2, "qcrdincb");
@@ -4877,14 +4877,67 @@ static int qeth_query_card_info_cb(struct qeth_card *card,
 		return -EIO;
 
 	card_info = &cmd->data.setadapterparms.data.card_info;
-	carrier_info->card_type = card_info->card_type;
-	carrier_info->port_mode = card_info->port_mode;
-	carrier_info->port_speed = card_info->port_speed;
+	netdev_dbg(card->dev,
+		   "card info: card_type=0x%02x, port_mode=0x%04x, port_speed=0x%08x\n",
+		   card_info->card_type, card_info->port_mode,
+		   card_info->port_speed);
+
+	switch (card_info->port_mode) {
+	case CARD_INFO_PORTM_FULLDUPLEX:
+		link_info->duplex = DUPLEX_FULL;
+		break;
+	case CARD_INFO_PORTM_HALFDUPLEX:
+		link_info->duplex = DUPLEX_HALF;
+		break;
+	default:
+		link_info->duplex = DUPLEX_UNKNOWN;
+	}
+
+	switch (card_info->card_type) {
+	case CARD_INFO_TYPE_1G_COPPER_A:
+	case CARD_INFO_TYPE_1G_COPPER_B:
+		link_info->speed = SPEED_1000;
+		link_info->port = PORT_TP;
+		break;
+	case CARD_INFO_TYPE_1G_FIBRE_A:
+	case CARD_INFO_TYPE_1G_FIBRE_B:
+		link_info->speed = SPEED_1000;
+		link_info->port = PORT_FIBRE;
+		break;
+	case CARD_INFO_TYPE_10G_FIBRE_A:
+	case CARD_INFO_TYPE_10G_FIBRE_B:
+		link_info->speed = SPEED_10000;
+		link_info->port = PORT_FIBRE;
+		break;
+	default:
+		switch (card_info->port_speed) {
+		case CARD_INFO_PORTS_10M:
+			link_info->speed = SPEED_10;
+			break;
+		case CARD_INFO_PORTS_100M:
+			link_info->speed = SPEED_100;
+			break;
+		case CARD_INFO_PORTS_1G:
+			link_info->speed = SPEED_1000;
+			break;
+		case CARD_INFO_PORTS_10G:
+			link_info->speed = SPEED_10000;
+			break;
+		case CARD_INFO_PORTS_25G:
+			link_info->speed = SPEED_25000;
+			break;
+		default:
+			link_info->speed = SPEED_UNKNOWN;
+		}
+
+		link_info->port = PORT_OTHER;
+	}
+
 	return 0;
 }
 
 int qeth_query_card_info(struct qeth_card *card,
-			 struct carrier_info *carrier_info)
+			 struct qeth_link_info *link_info)
 {
 	struct qeth_cmd_buffer *iob;
 
@@ -4894,8 +4947,8 @@ int qeth_query_card_info(struct qeth_card *card,
 	iob = qeth_get_adapter_cmd(card, IPA_SETADP_QUERY_CARD_INFO, 0);
 	if (!iob)
 		return -ENOMEM;
-	return qeth_send_ipa_cmd(card, iob, qeth_query_card_info_cb,
-					(void *)carrier_info);
+
+	return qeth_send_ipa_cmd(card, iob, qeth_query_card_info_cb, link_info);
 }
 
 /**
diff --git a/drivers/s390/net/qeth_ethtool.c b/drivers/s390/net/qeth_ethtool.c
index b843df2c14b1..a6455819f403 100644
--- a/drivers/s390/net/qeth_ethtool.c
+++ b/drivers/s390/net/qeth_ethtool.c
@@ -324,8 +324,7 @@ static int qeth_set_per_queue_coalesce(struct net_device *dev, u32 queue,
 /* Autoneg and full-duplex are supported and advertised unconditionally.     */
 /* Always advertise and support all speeds up to specified, and only one     */
 /* specified port type.							     */
-static void qeth_set_cmd_adv_sup(struct ethtool_link_ksettings *cmd,
-				int maxspeed, int porttype)
+static void qeth_set_ethtool_link_modes(struct ethtool_link_ksettings *cmd)
 {
 	ethtool_link_ksettings_zero_link_mode(cmd, supported);
 	ethtool_link_ksettings_zero_link_mode(cmd, advertising);
@@ -334,7 +333,7 @@ static void qeth_set_cmd_adv_sup(struct ethtool_link_ksettings *cmd,
 	ethtool_link_ksettings_add_link_mode(cmd, supported, Autoneg);
 	ethtool_link_ksettings_add_link_mode(cmd, advertising, Autoneg);
 
-	switch (porttype) {
+	switch (cmd->base.port) {
 	case PORT_TP:
 		ethtool_link_ksettings_add_link_mode(cmd, supported, TP);
 		ethtool_link_ksettings_add_link_mode(cmd, advertising, TP);
@@ -350,7 +349,7 @@ static void qeth_set_cmd_adv_sup(struct ethtool_link_ksettings *cmd,
 	}
 
 	/* partially does fall through, to also select lower speeds */
-	switch (maxspeed) {
+	switch (cmd->base.speed) {
 	case SPEED_25000:
 		ethtool_link_ksettings_add_link_mode(cmd, supported,
 						     25000baseSR_Full);
@@ -406,13 +405,12 @@ static void qeth_set_cmd_adv_sup(struct ethtool_link_ksettings *cmd,
 	}
 }
 
-
 static int qeth_get_link_ksettings(struct net_device *netdev,
 				   struct ethtool_link_ksettings *cmd)
 {
 	struct qeth_card *card = netdev->ml_priv;
+	struct qeth_link_info link_info;
 	enum qeth_link_types link_type;
-	struct carrier_info carrier_info;
 
 	if (IS_IQD(card) || IS_VM_NIC(card))
 		link_type = QETH_LINK_TYPE_10GBIT_ETH;
@@ -449,66 +447,18 @@ static int qeth_get_link_ksettings(struct net_device *netdev,
 		cmd->base.speed = SPEED_10;
 		cmd->base.port = PORT_TP;
 	}
-	qeth_set_cmd_adv_sup(cmd, cmd->base.speed, cmd->base.port);
 
 	/* Check if we can obtain more accurate information.	 */
-	/* If QUERY_CARD_INFO command is not supported or fails, */
-	/* just return the heuristics that was filled above.	 */
-	if (qeth_query_card_info(card, &carrier_info))
-		return 0;
-
-	netdev_dbg(netdev,
-	"card info: card_type=0x%02x, port_mode=0x%04x, port_speed=0x%08x\n",
-			carrier_info.card_type,
-			carrier_info.port_mode,
-			carrier_info.port_speed);
-
-	/* Update attributes for which we've obtained more authoritative */
-	/* information, leave the rest the way they where filled above.  */
-	switch (carrier_info.card_type) {
-	case CARD_INFO_TYPE_1G_COPPER_A:
-	case CARD_INFO_TYPE_1G_COPPER_B:
-		cmd->base.port = PORT_TP;
-		qeth_set_cmd_adv_sup(cmd, SPEED_1000, cmd->base.port);
-		break;
-	case CARD_INFO_TYPE_1G_FIBRE_A:
-	case CARD_INFO_TYPE_1G_FIBRE_B:
-		cmd->base.port = PORT_FIBRE;
-		qeth_set_cmd_adv_sup(cmd, SPEED_1000, cmd->base.port);
-		break;
-	case CARD_INFO_TYPE_10G_FIBRE_A:
-	case CARD_INFO_TYPE_10G_FIBRE_B:
-		cmd->base.port = PORT_FIBRE;
-		qeth_set_cmd_adv_sup(cmd, SPEED_10000, cmd->base.port);
-		break;
-	}
-
-	switch (carrier_info.port_mode) {
-	case CARD_INFO_PORTM_FULLDUPLEX:
-		cmd->base.duplex = DUPLEX_FULL;
-		break;
-	case CARD_INFO_PORTM_HALFDUPLEX:
-		cmd->base.duplex = DUPLEX_HALF;
-		break;
+	if (!qeth_query_card_info(card, &link_info)) {
+		if (link_info.speed != SPEED_UNKNOWN)
+			cmd->base.speed = link_info.speed;
+		if (link_info.duplex != DUPLEX_UNKNOWN)
+			cmd->base.duplex = link_info.duplex;
+		if (link_info.port != PORT_OTHER)
+			cmd->base.port = link_info.port;
 	}
 
-	switch (carrier_info.port_speed) {
-	case CARD_INFO_PORTS_10M:
-		cmd->base.speed = SPEED_10;
-		break;
-	case CARD_INFO_PORTS_100M:
-		cmd->base.speed = SPEED_100;
-		break;
-	case CARD_INFO_PORTS_1G:
-		cmd->base.speed = SPEED_1000;
-		break;
-	case CARD_INFO_PORTS_10G:
-		cmd->base.speed = SPEED_10000;
-		break;
-	case CARD_INFO_PORTS_25G:
-		cmd->base.speed = SPEED_25000;
-		break;
-	}
+	qeth_set_ethtool_link_modes(cmd);
 
 	return 0;
 }
-- 
cgit v1.2.3


From baf7998d5f2116ab991236ac0d67f7021dc2ae55 Mon Sep 17 00:00:00 2001
From: Julian Wiedmann
Date: Tue, 17 Nov 2020 17:15:17 +0100
Subject: s390/qeth: set static link info during initialization

Hard-code the minimal link info at initialization time, after we
obtained the link_type. qeth_get_link_ksettings() can still override
this with more accurate data from QUERY CARD INFO later on.

Don't set arbitrary defaults for unknown OSA link types, they
certainly won't match any future type.

Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
 drivers/s390/net/qeth_core.h      |  1 +
 drivers/s390/net/qeth_core_main.c | 38 ++++++++++++++++++++++++++++++++++++++
 drivers/s390/net/qeth_ethtool.c   | 34 +++-------------------------------
 3 files changed, 42 insertions(+), 31 deletions(-)

(limited to 'drivers/s390')

diff --git a/drivers/s390/net/qeth_core.h b/drivers/s390/net/qeth_core.h
index a4db7684d084..843385f9eae0 100644
--- a/drivers/s390/net/qeth_core.h
+++ b/drivers/s390/net/qeth_core.h
@@ -738,6 +738,7 @@ struct qeth_card_info {
 	struct qeth_card_blkt blkt;
 	__u32 diagass_support;
 	__u32 hwtrap;
+	struct qeth_link_info link_info;
 };
 
 enum qeth_discipline_id {
diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
index 39530f8e477f..10997118d0b6 100644
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -4951,6 +4951,42 @@ int qeth_query_card_info(struct qeth_card *card,
 	return qeth_send_ipa_cmd(card, iob, qeth_query_card_info_cb, link_info);
 }
 
+static void qeth_init_link_info(struct qeth_card *card)
+{
+	card->info.link_info.duplex = DUPLEX_FULL;
+
+	if (IS_IQD(card) || IS_VM_NIC(card)) {
+		card->info.link_info.speed = SPEED_10000;
+		card->info.link_info.port = PORT_FIBRE;
+	} else {
+		switch (card->info.link_type) {
+		case QETH_LINK_TYPE_FAST_ETH:
+		case QETH_LINK_TYPE_LANE_ETH100:
+			card->info.link_info.speed = SPEED_100;
+			card->info.link_info.port = PORT_TP;
+			break;
+		case QETH_LINK_TYPE_GBIT_ETH:
+		case QETH_LINK_TYPE_LANE_ETH1000:
+			card->info.link_info.speed = SPEED_1000;
+			card->info.link_info.port = PORT_FIBRE;
+			break;
+		case QETH_LINK_TYPE_10GBIT_ETH:
+			card->info.link_info.speed = SPEED_10000;
+			card->info.link_info.port = PORT_FIBRE;
+			break;
+		case QETH_LINK_TYPE_25GBIT_ETH:
+			card->info.link_info.speed = SPEED_25000;
+			card->info.link_info.port = PORT_FIBRE;
+			break;
+		default:
+			dev_info(&card->gdev->dev, "Unknown link type %x\n",
+				 card->info.link_type);
+			card->info.link_info.speed = SPEED_UNKNOWN;
+			card->info.link_info.port = PORT_OTHER;
+		}
+	}
+}
+
 /**
  * qeth_vm_request_mac() - Request a hypervisor-managed MAC address
  * @card: pointer to a qeth_card
@@ -5335,6 +5371,8 @@ retriable:
 			goto out;
 	}
 
+	qeth_init_link_info(card);
+
 	rc = qeth_init_qdio_queues(card);
 	if (rc) {
 		QETH_CARD_TEXT_(card, 2, "9err%d", rc);
diff --git a/drivers/s390/net/qeth_ethtool.c b/drivers/s390/net/qeth_ethtool.c
index a6455819f403..b8e74018b44f 100644
--- a/drivers/s390/net/qeth_ethtool.c
+++ b/drivers/s390/net/qeth_ethtool.c
@@ -410,44 +410,16 @@ static int qeth_get_link_ksettings(struct net_device *netdev,
 {
 	struct qeth_card *card = netdev->ml_priv;
 	struct qeth_link_info link_info;
-	enum qeth_link_types link_type;
 
-	if (IS_IQD(card) || IS_VM_NIC(card))
-		link_type = QETH_LINK_TYPE_10GBIT_ETH;
-	else
-		link_type = card->info.link_type;
-
-	cmd->base.duplex = DUPLEX_FULL;
+	cmd->base.speed = card->info.link_info.speed;
+	cmd->base.duplex = card->info.link_info.duplex;
+	cmd->base.port = card->info.link_info.port;
 	cmd->base.autoneg = AUTONEG_ENABLE;
 	cmd->base.phy_address = 0;
 	cmd->base.mdio_support = 0;
 	cmd->base.eth_tp_mdix = ETH_TP_MDI_INVALID;
 	cmd->base.eth_tp_mdix_ctrl = ETH_TP_MDI_INVALID;
 
-	switch (link_type) {
-	case QETH_LINK_TYPE_FAST_ETH:
-	case QETH_LINK_TYPE_LANE_ETH100:
-		cmd->base.speed = SPEED_100;
-		cmd->base.port = PORT_TP;
-		break;
-	case QETH_LINK_TYPE_GBIT_ETH:
-	case QETH_LINK_TYPE_LANE_ETH1000:
-		cmd->base.speed = SPEED_1000;
-		cmd->base.port = PORT_FIBRE;
-		break;
-	case QETH_LINK_TYPE_10GBIT_ETH:
-		cmd->base.speed = SPEED_10000;
-		cmd->base.port = PORT_FIBRE;
-		break;
-	case QETH_LINK_TYPE_25GBIT_ETH:
-		cmd->base.speed = SPEED_25000;
-		cmd->base.port = PORT_FIBRE;
-		break;
-	default:
-		cmd->base.speed = SPEED_10;
-		cmd->base.port = PORT_TP;
-	}
-
 	/* Check if we can obtain more accurate information.	 */
 	if (!qeth_query_card_info(card, &link_info)) {
 		if (link_info.speed != SPEED_UNKNOWN)
-- 
cgit v1.2.3


From f252fa8ea0a0fa3fe05c0b1af5087313c8ec7813 Mon Sep 17 00:00:00 2001
From: Julian Wiedmann
Date: Tue, 17 Nov 2020 17:15:18 +0100
Subject: s390/qeth: clean up default cases for ethtool link mode

Remove the default case for PORT_* and SPEED_* in our ethtool code.

The only time these could be hit is if qeth_init_link_info() was unable
to determine the port type from an OSA adapter's link_type.
We already throw a message in this case, so reduce the noise and don't
report bad data (ie. it's much more likely that any future link_type
will represent a PORT_FIBRE link ...).

Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
 drivers/s390/net/qeth_ethtool.c | 14 ++------------
 1 file changed, 2 insertions(+), 12 deletions(-)

(limited to 'drivers/s390')

diff --git a/drivers/s390/net/qeth_ethtool.c b/drivers/s390/net/qeth_ethtool.c
index b8e74018b44f..50b0c1810850 100644
--- a/drivers/s390/net/qeth_ethtool.c
+++ b/drivers/s390/net/qeth_ethtool.c
@@ -343,9 +343,7 @@ static void qeth_set_ethtool_link_modes(struct ethtool_link_ksettings *cmd)
 		ethtool_link_ksettings_add_link_mode(cmd, advertising, FIBRE);
 		break;
 	default:
-		ethtool_link_ksettings_add_link_mode(cmd, supported, TP);
-		ethtool_link_ksettings_add_link_mode(cmd, advertising, TP);
-		WARN_ON_ONCE(1);
+		break;
 	}
 
 	/* partially does fall through, to also select lower speeds */
@@ -393,15 +391,7 @@ static void qeth_set_ethtool_link_modes(struct ethtool_link_ksettings *cmd)
 						     10baseT_Half);
 		break;
 	default:
-		ethtool_link_ksettings_add_link_mode(cmd, supported,
-						     10baseT_Full);
-		ethtool_link_ksettings_add_link_mode(cmd, advertising,
-						     10baseT_Full);
-		ethtool_link_ksettings_add_link_mode(cmd, supported,
-						     10baseT_Half);
-		ethtool_link_ksettings_add_link_mode(cmd, advertising,
-						     10baseT_Half);
-		WARN_ON_ONCE(1);
+		break;
 	}
 }
 
-- 
cgit v1.2.3


From e92d42e7602b97b9eb73ce810c5bf62cc65cbb7a Mon Sep 17 00:00:00 2001
From: Julian Wiedmann
Date: Tue, 17 Nov 2020 17:15:19 +0100
Subject: s390/qeth: use QUERY OAT for initial link info

Improve the initial link info with data obtained from QUERY OAT.
Doing so _only_ at initialization time avoids
1. dealing with multi-part replies, and
2. sifting through all the data that may get returned at runtime.

This allows us to determine the correct port type for the 1000BT variant
of recent OSA adapter generations (where the .card_type field in
QUERY CARD INFO is no longer sufficient).

Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
 drivers/s390/net/qeth_core_main.c | 107 ++++++++++++++++++++++++++++++++++++++
 drivers/s390/net/qeth_core_mpc.h  |  40 +++++++++++++-
 2 files changed, 145 insertions(+), 2 deletions(-)

(limited to 'drivers/s390')

diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
index 10997118d0b6..43d8a0a9c121 100644
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -4951,6 +4951,86 @@ int qeth_query_card_info(struct qeth_card *card,
 	return qeth_send_ipa_cmd(card, iob, qeth_query_card_info_cb, link_info);
 }
 
+static int qeth_init_link_info_oat_cb(struct qeth_card *card,
+				      struct qeth_reply *reply_priv,
+				      unsigned long data)
+{
+	struct qeth_ipa_cmd *cmd = (struct qeth_ipa_cmd *)data;
+	struct qeth_link_info *link_info = reply_priv->param;
+	struct qeth_query_oat_physical_if *phys_if;
+	struct qeth_query_oat_reply *reply;
+
+	if (qeth_setadpparms_inspect_rc(cmd))
+		return -EIO;
+
+	/* Multi-part reply is unexpected, don't bother: */
+	if (cmd->data.setadapterparms.hdr.used_total > 1)
+		return -EINVAL;
+
+	/* Expect the reply to start with phys_if data: */
+	reply = &cmd->data.setadapterparms.data.query_oat.reply[0];
+	if (reply->type != QETH_QOAT_REPLY_TYPE_PHYS_IF ||
+	    reply->length < sizeof(*reply))
+		return -EINVAL;
+
+	phys_if = &reply->phys_if;
+
+	switch (phys_if->speed_duplex) {
+	case QETH_QOAT_PHYS_SPEED_10M_HALF:
+		link_info->speed = SPEED_10;
+		link_info->duplex = DUPLEX_HALF;
+		break;
+	case QETH_QOAT_PHYS_SPEED_10M_FULL:
+		link_info->speed = SPEED_10;
+		link_info->duplex = DUPLEX_FULL;
+		break;
+	case QETH_QOAT_PHYS_SPEED_100M_HALF:
+		link_info->speed = SPEED_100;
+		link_info->duplex = DUPLEX_HALF;
+		break;
+	case QETH_QOAT_PHYS_SPEED_100M_FULL:
+		link_info->speed = SPEED_100;
+		link_info->duplex = DUPLEX_FULL;
+		break;
+	case QETH_QOAT_PHYS_SPEED_1000M_HALF:
+		link_info->speed = SPEED_1000;
+		link_info->duplex = DUPLEX_HALF;
+		break;
+	case QETH_QOAT_PHYS_SPEED_1000M_FULL:
+		link_info->speed = SPEED_1000;
+		link_info->duplex = DUPLEX_FULL;
+		break;
+	case QETH_QOAT_PHYS_SPEED_10G_FULL:
+		link_info->speed = SPEED_10000;
+		link_info->duplex = DUPLEX_FULL;
+		break;
+	case QETH_QOAT_PHYS_SPEED_25G_FULL:
+		link_info->speed = SPEED_25000;
+		link_info->duplex = DUPLEX_FULL;
+		break;
+	case QETH_QOAT_PHYS_SPEED_UNKNOWN:
+	default:
+		link_info->speed = SPEED_UNKNOWN;
+		link_info->duplex = DUPLEX_UNKNOWN;
+		break;
+	}
+
+	switch (phys_if->media_type) {
+	case QETH_QOAT_PHYS_MEDIA_COPPER:
+		link_info->port = PORT_TP;
+		break;
+	case QETH_QOAT_PHYS_MEDIA_FIBRE_SHORT:
+	case QETH_QOAT_PHYS_MEDIA_FIBRE_LONG:
+		link_info->port = PORT_FIBRE;
+		break;
+	default:
+		link_info->port = PORT_OTHER;
+		break;
+	}
+
+	return 0;
+}
+
 static void qeth_init_link_info(struct qeth_card *card)
 {
 	card->info.link_info.duplex = DUPLEX_FULL;
@@ -4985,6 +5065,33 @@ static void qeth_init_link_info(struct qeth_card *card)
 			card->info.link_info.port = PORT_OTHER;
 		}
 	}
+
+	/* Get more accurate data via QUERY OAT: */
+	if (qeth_adp_supported(card, IPA_SETADP_QUERY_OAT)) {
+		struct qeth_link_info link_info;
+		struct qeth_cmd_buffer *iob;
+
+		iob = qeth_get_adapter_cmd(card, IPA_SETADP_QUERY_OAT,
+					   SETADP_DATA_SIZEOF(query_oat));
+		if (iob) {
+			struct qeth_ipa_cmd *cmd = __ipa_cmd(iob);
+			struct qeth_query_oat *oat_req;
+
+			oat_req = &cmd->data.setadapterparms.data.query_oat;
+			oat_req->subcmd_code = QETH_QOAT_SCOPE_INTERFACE;
+
+			if (!qeth_send_ipa_cmd(card, iob,
+					       qeth_init_link_info_oat_cb,
+					       &link_info)) {
+				if (link_info.speed != SPEED_UNKNOWN)
+					card->info.link_info.speed = link_info.speed;
+				if (link_info.duplex != DUPLEX_UNKNOWN)
+					card->info.link_info.duplex = link_info.duplex;
+				if (link_info.port != PORT_OTHER)
+					card->info.link_info.port = link_info.port;
+			}
+		}
+	}
 }
 
 /**
diff --git a/drivers/s390/net/qeth_core_mpc.h b/drivers/s390/net/qeth_core_mpc.h
index 6541bab96822..e4bde7daf083 100644
--- a/drivers/s390/net/qeth_core_mpc.h
+++ b/drivers/s390/net/qeth_core_mpc.h
@@ -489,9 +489,45 @@ struct qeth_set_access_ctrl {
 	__u8 reserved[8];
 } __attribute__((packed));
 
+#define QETH_QOAT_PHYS_SPEED_UNKNOWN		0x00
+#define QETH_QOAT_PHYS_SPEED_10M_HALF		0x01
+#define QETH_QOAT_PHYS_SPEED_10M_FULL		0x02
+#define QETH_QOAT_PHYS_SPEED_100M_HALF		0x03
+#define QETH_QOAT_PHYS_SPEED_100M_FULL		0x04
+#define QETH_QOAT_PHYS_SPEED_1000M_HALF		0x05
+#define QETH_QOAT_PHYS_SPEED_1000M_FULL		0x06
+// n/a						0x07
+#define QETH_QOAT_PHYS_SPEED_10G_FULL		0x08
+// n/a						0x09
+#define QETH_QOAT_PHYS_SPEED_25G_FULL		0x0A
+
+#define QETH_QOAT_PHYS_MEDIA_COPPER		0x01
+#define QETH_QOAT_PHYS_MEDIA_FIBRE_SHORT	0x02
+#define QETH_QOAT_PHYS_MEDIA_FIBRE_LONG		0x04
+
+struct qeth_query_oat_physical_if {
+	u8 res_head[33];
+	u8 speed_duplex;
+	u8 media_type;
+	u8 res_tail[29];
+};
+
+#define QETH_QOAT_REPLY_TYPE_PHYS_IF		0x0004
+
+struct qeth_query_oat_reply {
+	u16 type;
+	u16 length;
+	u16 version;
+	u8 res[10];
+	struct qeth_query_oat_physical_if phys_if;
+};
+
+#define QETH_QOAT_SCOPE_INTERFACE		0x00000001
+
 struct qeth_query_oat {
-	__u32 subcmd_code;
-	__u8 reserved[12];
+	u32 subcmd_code;
+	u8 reserved[12];
+	struct qeth_query_oat_reply reply[];
 } __packed;
 
 struct qeth_qoat_priv {
-- 
cgit v1.2.3


From 235db5278316cc516de6b44e161a2afa5ccac61c Mon Sep 17 00:00:00 2001
From: Julian Wiedmann
Date: Tue, 17 Nov 2020 17:15:20 +0100
Subject: s390/qeth: improve selection of ethtool link modes

The link mode is a combination of port speed and port mode. But we
currently only consider the speed, and then typically select the
corresponding TP-based link mode. For 1G and 10G Fibre links this means
we display the wrong link modes.

Move the SPEED_* switch statements inside the PORT_* cases, and only
consider valid combinations where we can select the corresponding
link mode. Add the relevant link modes (1000baseX, 10000baseSR and
1000baseLR) that were introduced back with
commit 5711a9822144 ("net: ethtool: add support for 1000BaseX and missing 10G link modes").

To differentiate between 10000baseSR and 10000baseLR, use the detailed
media_type information that QUERY OAT provides.

Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
 drivers/s390/net/qeth_core.h      |   7 +++
 drivers/s390/net/qeth_core_main.c |  11 ++++
 drivers/s390/net/qeth_ethtool.c   | 124 +++++++++++++++++++++++---------------
 3 files changed, 93 insertions(+), 49 deletions(-)

(limited to 'drivers/s390')

diff --git a/drivers/s390/net/qeth_core.h b/drivers/s390/net/qeth_core.h
index 843385f9eae0..32ea41b4356b 100644
--- a/drivers/s390/net/qeth_core.h
+++ b/drivers/s390/net/qeth_core.h
@@ -701,10 +701,17 @@ enum qeth_pnso_mode {
 	QETH_PNSO_ADDR_INFO,
 };
 
+enum qeth_link_mode {
+	QETH_LINK_MODE_UNKNOWN,
+	QETH_LINK_MODE_FIBRE_SHORT,
+	QETH_LINK_MODE_FIBRE_LONG,
+};
+
 struct qeth_link_info {
 	u32 speed;
 	u8 duplex;
 	u8 port;
+	enum qeth_link_mode link_mode;
 };
 
 #define QETH_BROADCAST_WITH_ECHO    0x01
diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
index 43d8a0a9c121..d9ba0586373b 100644
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -5018,13 +5018,19 @@ static int qeth_init_link_info_oat_cb(struct qeth_card *card,
 	switch (phys_if->media_type) {
 	case QETH_QOAT_PHYS_MEDIA_COPPER:
 		link_info->port = PORT_TP;
+		link_info->link_mode = QETH_LINK_MODE_UNKNOWN;
 		break;
 	case QETH_QOAT_PHYS_MEDIA_FIBRE_SHORT:
+		link_info->port = PORT_FIBRE;
+		link_info->link_mode = QETH_LINK_MODE_FIBRE_SHORT;
+		break;
 	case QETH_QOAT_PHYS_MEDIA_FIBRE_LONG:
 		link_info->port = PORT_FIBRE;
+		link_info->link_mode = QETH_LINK_MODE_FIBRE_LONG;
 		break;
 	default:
 		link_info->port = PORT_OTHER;
+		link_info->link_mode = QETH_LINK_MODE_UNKNOWN;
 		break;
 	}
 
@@ -5038,6 +5044,7 @@ static void qeth_init_link_info(struct qeth_card *card)
 	if (IS_IQD(card) || IS_VM_NIC(card)) {
 		card->info.link_info.speed = SPEED_10000;
 		card->info.link_info.port = PORT_FIBRE;
+		card->info.link_info.link_mode = QETH_LINK_MODE_FIBRE_SHORT;
 	} else {
 		switch (card->info.link_type) {
 		case QETH_LINK_TYPE_FAST_ETH:
@@ -5064,6 +5071,8 @@ static void qeth_init_link_info(struct qeth_card *card)
 			card->info.link_info.speed = SPEED_UNKNOWN;
 			card->info.link_info.port = PORT_OTHER;
 		}
+
+		card->info.link_info.link_mode = QETH_LINK_MODE_UNKNOWN;
 	}
 
 	/* Get more accurate data via QUERY OAT: */
@@ -5089,6 +5098,8 @@ static void qeth_init_link_info(struct qeth_card *card)
 					card->info.link_info.duplex = link_info.duplex;
 				if (link_info.port != PORT_OTHER)
 					card->info.link_info.port = link_info.port;
+				if (link_info.link_mode != QETH_LINK_MODE_UNKNOWN)
+					card->info.link_info.link_mode = link_info.link_mode;
 			}
 		}
 	}
diff --git a/drivers/s390/net/qeth_ethtool.c b/drivers/s390/net/qeth_ethtool.c
index 50b0c1810850..3a51bbff0ffe 100644
--- a/drivers/s390/net/qeth_ethtool.c
+++ b/drivers/s390/net/qeth_ethtool.c
@@ -324,7 +324,8 @@ static int qeth_set_per_queue_coalesce(struct net_device *dev, u32 queue,
 /* Autoneg and full-duplex are supported and advertised unconditionally.     */
 /* Always advertise and support all speeds up to specified, and only one     */
 /* specified port type.							     */
-static void qeth_set_ethtool_link_modes(struct ethtool_link_ksettings *cmd)
+static void qeth_set_ethtool_link_modes(struct ethtool_link_ksettings *cmd,
+					enum qeth_link_mode link_mode)
 {
 	ethtool_link_ksettings_zero_link_mode(cmd, supported);
 	ethtool_link_ksettings_zero_link_mode(cmd, advertising);
@@ -337,58 +338,83 @@ static void qeth_set_ethtool_link_modes(struct ethtool_link_ksettings *cmd)
 	case PORT_TP:
 		ethtool_link_ksettings_add_link_mode(cmd, supported, TP);
 		ethtool_link_ksettings_add_link_mode(cmd, advertising, TP);
+
+		switch (cmd->base.speed) {
+		case SPEED_10000:
+			ethtool_link_ksettings_add_link_mode(cmd, supported,
+							     10000baseT_Full);
+			ethtool_link_ksettings_add_link_mode(cmd, advertising,
+							     10000baseT_Full);
+			fallthrough;
+		case SPEED_1000:
+			ethtool_link_ksettings_add_link_mode(cmd, supported,
+							     1000baseT_Full);
+			ethtool_link_ksettings_add_link_mode(cmd, advertising,
+							     1000baseT_Full);
+			ethtool_link_ksettings_add_link_mode(cmd, supported,
+							     1000baseT_Half);
+			ethtool_link_ksettings_add_link_mode(cmd, advertising,
+							     1000baseT_Half);
+			fallthrough;
+		case SPEED_100:
+			ethtool_link_ksettings_add_link_mode(cmd, supported,
+							     100baseT_Full);
+			ethtool_link_ksettings_add_link_mode(cmd, advertising,
+							     100baseT_Full);
+			ethtool_link_ksettings_add_link_mode(cmd, supported,
+							     100baseT_Half);
+			ethtool_link_ksettings_add_link_mode(cmd, advertising,
+							     100baseT_Half);
+			fallthrough;
+		case SPEED_10:
+			ethtool_link_ksettings_add_link_mode(cmd, supported,
+							     10baseT_Full);
+			ethtool_link_ksettings_add_link_mode(cmd, advertising,
+							     10baseT_Full);
+			ethtool_link_ksettings_add_link_mode(cmd, supported,
+							     10baseT_Half);
+			ethtool_link_ksettings_add_link_mode(cmd, advertising,
+							     10baseT_Half);
+			break;
+		default:
+			break;
+		}
+
 		break;
 	case PORT_FIBRE:
 		ethtool_link_ksettings_add_link_mode(cmd, supported, FIBRE);
 		ethtool_link_ksettings_add_link_mode(cmd, advertising, FIBRE);
-		break;
-	default:
-		break;
-	}
 
-	/* partially does fall through, to also select lower speeds */
-	switch (cmd->base.speed) {
-	case SPEED_25000:
-		ethtool_link_ksettings_add_link_mode(cmd, supported,
-						     25000baseSR_Full);
-		ethtool_link_ksettings_add_link_mode(cmd, advertising,
-						     25000baseSR_Full);
-		break;
-	case SPEED_10000:
-		ethtool_link_ksettings_add_link_mode(cmd, supported,
-						     10000baseT_Full);
-		ethtool_link_ksettings_add_link_mode(cmd, advertising,
-						     10000baseT_Full);
-		fallthrough;
-	case SPEED_1000:
-		ethtool_link_ksettings_add_link_mode(cmd, supported,
-						     1000baseT_Full);
-		ethtool_link_ksettings_add_link_mode(cmd, advertising,
-						     1000baseT_Full);
-		ethtool_link_ksettings_add_link_mode(cmd, supported,
-						     1000baseT_Half);
-		ethtool_link_ksettings_add_link_mode(cmd, advertising,
-						     1000baseT_Half);
-		fallthrough;
-	case SPEED_100:
-		ethtool_link_ksettings_add_link_mode(cmd, supported,
-						     100baseT_Full);
-		ethtool_link_ksettings_add_link_mode(cmd, advertising,
-						     100baseT_Full);
-		ethtool_link_ksettings_add_link_mode(cmd, supported,
-						     100baseT_Half);
-		ethtool_link_ksettings_add_link_mode(cmd, advertising,
-						     100baseT_Half);
-		fallthrough;
-	case SPEED_10:
-		ethtool_link_ksettings_add_link_mode(cmd, supported,
-						     10baseT_Full);
-		ethtool_link_ksettings_add_link_mode(cmd, advertising,
-						     10baseT_Full);
-		ethtool_link_ksettings_add_link_mode(cmd, supported,
-						     10baseT_Half);
-		ethtool_link_ksettings_add_link_mode(cmd, advertising,
-						     10baseT_Half);
+		switch (cmd->base.speed) {
+		case SPEED_25000:
+			ethtool_link_ksettings_add_link_mode(cmd, supported,
+							     25000baseSR_Full);
+			ethtool_link_ksettings_add_link_mode(cmd, advertising,
+							     25000baseSR_Full);
+			break;
+		case SPEED_10000:
+			if (link_mode == QETH_LINK_MODE_FIBRE_LONG) {
+				ethtool_link_ksettings_add_link_mode(cmd, supported,
+								     10000baseLR_Full);
+				ethtool_link_ksettings_add_link_mode(cmd, advertising,
+								     10000baseLR_Full);
+			} else if (link_mode == QETH_LINK_MODE_FIBRE_SHORT) {
+				ethtool_link_ksettings_add_link_mode(cmd, supported,
+								     10000baseSR_Full);
+				ethtool_link_ksettings_add_link_mode(cmd, advertising,
+								     10000baseSR_Full);
+			}
+			break;
+		case SPEED_1000:
+			ethtool_link_ksettings_add_link_mode(cmd, supported,
+							     1000baseX_Full);
+			ethtool_link_ksettings_add_link_mode(cmd, advertising,
+							     1000baseX_Full);
+			break;
+		default:
+			break;
+		}
+
 		break;
 	default:
 		break;
@@ -420,7 +446,7 @@ static int qeth_get_link_ksettings(struct net_device *netdev,
 			cmd->base.port = link_info.port;
 	}
 
-	qeth_set_ethtool_link_modes(cmd);
+	qeth_set_ethtool_link_modes(cmd, card->info.link_info.link_mode);
 
 	return 0;
 }
-- 
cgit v1.2.3


From 94e0028a052ad3df1c0229f66104eff16525da11 Mon Sep 17 00:00:00 2001
From: Sebastian Andrzej Siewior
Date: Mon, 30 Nov 2020 11:09:45 +0100
Subject: s390/ctcm: Avoid temporary allocation of struct th_header and
 th_sweep.

The size of struct th_header is 8 byte and the size of struct th_sweep
is 16 byte. The memory for is allocated, initialized, used and
deallocated a few lines later.

It is more efficient to avoid the allocation/free dance and assign the
values directly to skb's data part instead of using memcpy() for it.

Avoid an allocation of struct th_sweep/th_header and use the resulting
skb pointer instead.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
[jwi: use skb_put_zero(), instead of skb_put() + memset to 0]
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
 drivers/s390/net/ctcm_fsms.c | 15 ++++-----------
 drivers/s390/net/ctcm_main.c | 31 ++++---------------------------
 drivers/s390/net/ctcm_mpc.c  | 16 +---------------
 3 files changed, 9 insertions(+), 53 deletions(-)

(limited to 'drivers/s390')

diff --git a/drivers/s390/net/ctcm_fsms.c b/drivers/s390/net/ctcm_fsms.c
index 661d2a49bce9..b341075397d9 100644
--- a/drivers/s390/net/ctcm_fsms.c
+++ b/drivers/s390/net/ctcm_fsms.c
@@ -1303,12 +1303,10 @@ static void ctcmpc_chx_txdone(fsm_instance *fi, int event, void *arg)
 	/* p_header points to the last one we handled */
 	if (p_header)
 		p_header->pdu_flag |= PDU_LAST;	/*Say it's the last one*/
-	header = kzalloc(TH_HEADER_LENGTH, gfp_type());
-	if (!header) {
-		spin_unlock(&ch->collect_lock);
-		fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
-				goto done;
-	}
+
+	header = skb_push(ch->trans_skb, TH_HEADER_LENGTH);
+	memset(header, 0, TH_HEADER_LENGTH);
+
 	header->th_ch_flag = TH_HAS_PDU;  /* Normal data */
 	ch->th_seq_num++;
 	header->th_seq_num = ch->th_seq_num;
@@ -1316,11 +1314,6 @@ static void ctcmpc_chx_txdone(fsm_instance *fi, int event, void *arg)
 	CTCM_PR_DBGDATA("%s: ToVTAM_th_seq= %08x\n" ,
 					__func__, ch->th_seq_num);
 
-	memcpy(skb_push(ch->trans_skb, TH_HEADER_LENGTH), header,
-		TH_HEADER_LENGTH);	/* put the TH on the packet */
-
-	kfree(header);
-
 	CTCM_PR_DBGDATA("%s: trans_skb len:%04x \n",
 		       __func__, ch->trans_skb->len);
 	CTCM_PR_DBGDATA("%s: up-to-50 bytes of trans_skb "
diff --git a/drivers/s390/net/ctcm_main.c b/drivers/s390/net/ctcm_main.c
index d06809eac16d..9e28c63415ed 100644
--- a/drivers/s390/net/ctcm_main.c
+++ b/drivers/s390/net/ctcm_main.c
@@ -623,25 +623,10 @@ static void ctcmpc_send_sweep_req(struct channel *rch)
 				goto nomem;
 	}
 
-	header = kmalloc(TH_SWEEP_LENGTH, gfp_type());
-
-	if (!header) {
-		dev_kfree_skb_any(sweep_skb);
-		/* rc = -ENOMEM; */
-				goto nomem;
-	}
-
-	header->th.th_seg	= 0x00 ;
+	header = skb_put_zero(sweep_skb, TH_SWEEP_LENGTH);
 	header->th.th_ch_flag	= TH_SWEEP_REQ;  /* 0x0f */
-	header->th.th_blk_flag	= 0x00;
-	header->th.th_is_xid	= 0x00;
-	header->th.th_seq_num	= 0x00;
 	header->sw.th_last_seq	= ch->th_seq_num;
 
-	skb_put_data(sweep_skb, header, TH_SWEEP_LENGTH);
-
-	kfree(header);
-
 	netif_trans_update(dev);
 	skb_queue_tail(&ch->sweep_queue, sweep_skb);
 
@@ -768,25 +753,17 @@ static int ctcmpc_transmit_skb(struct channel *ch, struct sk_buff *skb)
 
 	ch->prof.txlen += skb->len - PDU_HEADER_LENGTH;
 
-	header = kmalloc(TH_HEADER_LENGTH, gfp_type());
-	if (!header)
-		goto nomem_exit;
+	/* put the TH on the packet */
+	header = skb_push(skb, TH_HEADER_LENGTH);
+	memset(header, 0, TH_HEADER_LENGTH);
 
-	header->th_seg = 0x00;
 	header->th_ch_flag = TH_HAS_PDU;  /* Normal data */
-	header->th_blk_flag = 0x00;
-	header->th_is_xid = 0x00;          /* Just data here */
 	ch->th_seq_num++;
 	header->th_seq_num = ch->th_seq_num;
 
 	CTCM_PR_DBGDATA("%s(%s) ToVTAM_th_seq= %08x\n" ,
 		       __func__, dev->name, ch->th_seq_num);
 
-	/* put the TH on the packet */
-	memcpy(skb_push(skb, TH_HEADER_LENGTH), header, TH_HEADER_LENGTH);
-
-	kfree(header);
-
 	CTCM_PR_DBGDATA("%s(%s): skb len: %04x\n - pdu header and data for "
 			"up to 32 bytes sent to vtam:\n",
 				__func__, dev->name, skb->len);
diff --git a/drivers/s390/net/ctcm_mpc.c b/drivers/s390/net/ctcm_mpc.c
index 85a1a4533cbe..293d8870968c 100644
--- a/drivers/s390/net/ctcm_mpc.c
+++ b/drivers/s390/net/ctcm_mpc.c
@@ -655,24 +655,10 @@ static void ctcmpc_send_sweep_resp(struct channel *rch)
 		goto done;
 	}
 
-	header = kmalloc(sizeof(struct th_sweep), gfp_type());
-
-	if (!header) {
-		dev_kfree_skb_any(sweep_skb);
-		goto done;
-	}
-
-	header->th.th_seg	= 0x00 ;
+	header = skb_put_zero(sweep_skb, TH_SWEEP_LENGTH);
 	header->th.th_ch_flag	= TH_SWEEP_RESP;
-	header->th.th_blk_flag	= 0x00;
-	header->th.th_is_xid	= 0x00;
-	header->th.th_seq_num	= 0x00;
 	header->sw.th_last_seq	= ch->th_seq_num;
 
-	skb_put_data(sweep_skb, header, TH_SWEEP_LENGTH);
-
-	kfree(header);
-
 	netif_trans_update(dev);
 	skb_queue_tail(&ch->sweep_queue, sweep_skb);
 
-- 
cgit v1.2.3


From d38aa3962687d06e62bd7bae47a655f359261324 Mon Sep 17 00:00:00 2001
From: Sebastian Andrzej Siewior
Date: Mon, 30 Nov 2020 11:09:46 +0100
Subject: s390/ctcm: Avoid temporary allocation of struct qllc.

The size of struct qllc is 2 byte. The memory for is allocated,
initialized, used and deallocated a few lines later.

It is more efficient to avoid the allocation/free dance and assign the
values directly to skb's data part instead of using memcpy() for it.

Avoid an allocation of struct qllc and use the resulting skb pointer
instead.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
[jwi: remove a newline, reflow the commit msg]
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
 drivers/s390/net/ctcm_mpc.c | 21 ++++-----------------
 1 file changed, 4 insertions(+), 17 deletions(-)

(limited to 'drivers/s390')

diff --git a/drivers/s390/net/ctcm_mpc.c b/drivers/s390/net/ctcm_mpc.c
index 293d8870968c..8ae49732d1d2 100644
--- a/drivers/s390/net/ctcm_mpc.c
+++ b/drivers/s390/net/ctcm_mpc.c
@@ -2048,7 +2048,6 @@ static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg)
  */
 static int mpc_send_qllc_discontact(struct net_device *dev)
 {
-	__u32	new_len	= 0;
 	struct sk_buff   *skb;
 	struct qllc      *qllcptr;
 	struct ctcm_priv *priv = dev->ml_priv;
@@ -2079,31 +2078,19 @@ static int mpc_send_qllc_discontact(struct net_device *dev)
 	case MPCG_STATE_FLOWC:
 	case MPCG_STATE_READY:
 		grp->send_qllc_disc = 2;
-		new_len = sizeof(struct qllc);
-		qllcptr = kzalloc(new_len, gfp_type() | GFP_DMA);
-		if (qllcptr == NULL) {
-			CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
-				"%s(%s): qllcptr allocation error",
-						CTCM_FUNTAIL, dev->name);
-			return -ENOMEM;
-		}
-
-		qllcptr->qllc_address = 0xcc;
-		qllcptr->qllc_commands = 0x03;
-
-		skb = __dev_alloc_skb(new_len, GFP_ATOMIC);
 
+		skb = __dev_alloc_skb(sizeof(struct qllc), GFP_ATOMIC);
 		if (skb == NULL) {
 			CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 				"%s(%s): skb allocation error",
 						CTCM_FUNTAIL, dev->name);
 			priv->stats.rx_dropped++;
-			kfree(qllcptr);
 			return -ENOMEM;
 		}
 
-		skb_put_data(skb, qllcptr, new_len);
-		kfree(qllcptr);
+		qllcptr = skb_put(skb, sizeof(struct qllc));
+		qllcptr->qllc_address = 0xcc;
+		qllcptr->qllc_commands = 0x03;
 
 		if (skb_headroom(skb) < 4) {
 			CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
-- 
cgit v1.2.3


From ca738f5aa94560a0848df3dba3bdcf761d39714d Mon Sep 17 00:00:00 2001
From: Sebastian Andrzej Siewior
Date: Mon, 30 Nov 2020 11:09:47 +0100
Subject: s390/ctcm: Avoid temporary allocation of struct pdu.

The size of struct pdu is 8 byte. The memory is allocated, initialized,
used and deallocated a few lines later.

It is more efficient to avoid the allocation/free dance and assign the
values directly to skb's data part instead of using memcpy() for it.

Avoid an allocation of struct pdu and use the resulting skb pointer
instead.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
[jwi: Fix-up the pdu_offset, adjust skb->len for the pushed length.
      Reflow the commit msg.]
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
 drivers/s390/net/ctcm_main.c | 33 ++++++++-------------------------
 1 file changed, 8 insertions(+), 25 deletions(-)

(limited to 'drivers/s390')

diff --git a/drivers/s390/net/ctcm_main.c b/drivers/s390/net/ctcm_main.c
index 9e28c63415ed..92dd3c803d23 100644
--- a/drivers/s390/net/ctcm_main.c
+++ b/drivers/s390/net/ctcm_main.c
@@ -665,24 +665,16 @@ static int ctcmpc_transmit_skb(struct channel *ch, struct sk_buff *skb)
 	if ((fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) || grp->in_sweep) {
 		spin_lock_irqsave(&ch->collect_lock, saveflags);
 		refcount_inc(&skb->users);
-		p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type());
 
-		if (!p_header) {
-			spin_unlock_irqrestore(&ch->collect_lock, saveflags);
-				goto nomem_exit;
-		}
-
-		p_header->pdu_offset = skb->len;
+		p_header = skb_push(skb, PDU_HEADER_LENGTH);
+		p_header->pdu_offset = skb->len - PDU_HEADER_LENGTH;
 		p_header->pdu_proto = 0x01;
-		p_header->pdu_flag = 0x00;
 		if (be16_to_cpu(skb->protocol) == ETH_P_SNAP) {
-			p_header->pdu_flag |= PDU_FIRST | PDU_CNTL;
+			p_header->pdu_flag = PDU_FIRST | PDU_CNTL;
 		} else {
-			p_header->pdu_flag |= PDU_FIRST;
+			p_header->pdu_flag = PDU_FIRST;
 		}
 		p_header->pdu_seq = 0;
-		memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header,
-		       PDU_HEADER_LENGTH);
 
 		CTCM_PR_DEBUG("%s(%s): Put on collect_q - skb len: %04x \n"
 				"pdu header and data for up to 32 bytes:\n",
@@ -691,7 +683,6 @@ static int ctcmpc_transmit_skb(struct channel *ch, struct sk_buff *skb)
 
 		skb_queue_tail(&ch->collect_queue, skb);
 		ch->collect_len += skb->len;
-		kfree(p_header);
 
 		spin_unlock_irqrestore(&ch->collect_lock, saveflags);
 			goto done;
@@ -721,23 +712,15 @@ static int ctcmpc_transmit_skb(struct channel *ch, struct sk_buff *skb)
 		}
 	}
 
-	p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type());
-
-	if (!p_header)
-		goto nomem_exit;
-
-	p_header->pdu_offset = skb->len;
+	p_header = skb_push(skb, PDU_HEADER_LENGTH);
+	p_header->pdu_offset = skb->len - PDU_HEADER_LENGTH;
 	p_header->pdu_proto = 0x01;
-	p_header->pdu_flag = 0x00;
 	p_header->pdu_seq = 0;
 	if (be16_to_cpu(skb->protocol) == ETH_P_SNAP) {
-		p_header->pdu_flag |= PDU_FIRST | PDU_CNTL;
+		p_header->pdu_flag = PDU_FIRST | PDU_CNTL;
 	} else {
-		p_header->pdu_flag |= PDU_FIRST;
+		p_header->pdu_flag = PDU_FIRST;
 	}
-	memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header, PDU_HEADER_LENGTH);
-
-	kfree(p_header);
 
 	if (ch->collect_len > 0) {
 		spin_lock_irqsave(&ch->collect_lock, saveflags);
-- 
cgit v1.2.3


From 8dc4b6af0838cbad8e045a410667e7009bbc7c67 Mon Sep 17 00:00:00 2001
From: Sebastian Andrzej Siewior
Date: Mon, 30 Nov 2020 11:09:48 +0100
Subject: s390/ctcm: Use explicit allocation mask in ctcmpc_unpack_skb().

gfp_type() uses in_interrupt() to figure out the correct GFP mask.

The usage of in_interrupt() in drivers is phased out and Linus clearly
requested that code which changes behaviour depending on context should
either be separated or the context be conveyed in an argument passed by the
caller, which usually knows the context.

The call chain of ctcmpc_unpack_skb():
ctcmpc_bh()
 -> ctcmpc_unpack_skb()

ctcmpc_bh() is a tasklet handler so GFP_ATOMIC is needed.

Use GFP_ATOMIC as allocation type in ctcmpc_unpack_skb().

Reviewed-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
 drivers/s390/net/ctcm_mpc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'drivers/s390')

diff --git a/drivers/s390/net/ctcm_mpc.c b/drivers/s390/net/ctcm_mpc.c
index 8ae49732d1d2..19ee91acb89d 100644
--- a/drivers/s390/net/ctcm_mpc.c
+++ b/drivers/s390/net/ctcm_mpc.c
@@ -1163,7 +1163,7 @@ static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb)
 			skb_pull(pskb, new_len); /* point to next PDU */
 		}
 	} else {
-		mpcginfo = kmalloc(sizeof(struct mpcg_info), gfp_type());
+		mpcginfo = kmalloc(sizeof(struct mpcg_info), GFP_ATOMIC);
 		if (mpcginfo == NULL)
 					goto done;
 
-- 
cgit v1.2.3


From 04e4e469f99ae117080135d5069767f3c2455191 Mon Sep 17 00:00:00 2001
From: Sebastian Andrzej Siewior
Date: Mon, 30 Nov 2020 11:09:49 +0100
Subject: s390/ctcm: Use GFP_KERNEL in add_channel().

gfp_type() uses in_interrupt() to figure out the correct GFP mask.

The usage of in_interrupt() in drivers is phased out and Linus clearly
requested that code which changes behaviour depending on context should
either be separated or the context be conveyed in an argument passed by the
caller, which usually knows the context.

The memory allocation of `ch' a few lines above is using GFP_KERNEL,
also an allocation a few lines later is using GFP_KERNEL.

Use GFP_KERNEL for the memory allocation.

Reviewed-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
 drivers/s390/net/ctcm_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'drivers/s390')

diff --git a/drivers/s390/net/ctcm_main.c b/drivers/s390/net/ctcm_main.c
index 92dd3c803d23..c446883de5c8 100644
--- a/drivers/s390/net/ctcm_main.c
+++ b/drivers/s390/net/ctcm_main.c
@@ -1321,7 +1321,7 @@ static int add_channel(struct ccw_device *cdev, enum ctcm_channel_types type,
 
 	ch->protocol = priv->protocol;
 	if (IS_MPC(priv)) {
-		ch->discontact_th = kzalloc(TH_HEADER_LENGTH, gfp_type());
+		ch->discontact_th = kzalloc(TH_HEADER_LENGTH, GFP_KERNEL);
 		if (ch->discontact_th == NULL)
 					goto nomem_return;
 
-- 
cgit v1.2.3


From 8f4b6e35e270b3dca8943cf1a2de8d40b6074272 Mon Sep 17 00:00:00 2001
From: Sebastian Andrzej Siewior
Date: Mon, 30 Nov 2020 11:09:50 +0100
Subject: s390/ctcm: Use GFP_ATOMIC in ctcmpc_tx().

gfp_type() uses in_interrupt() to figure out the correct GFP mask.

The usage of in_interrupt() in drivers is phased out and Linus clearly
requested that code which changes behaviour depending on context should
either be separated or the context be conveyed in an argument passed by the
caller, which usually knows the context.

ctcmpc_tx() is used as net_device_ops::ndo_start_xmit. This callback is
invoked with disabled bottom halves.

Use GFP_ATOMIC for memory allocation in ctcmpc_tx().
Remove gfp_type() since the last user is gone.

Reviewed-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
---
 drivers/s390/net/ctcm_main.c | 2 +-
 drivers/s390/net/ctcm_main.h | 5 -----
 2 files changed, 1 insertion(+), 6 deletions(-)

(limited to 'drivers/s390')

diff --git a/drivers/s390/net/ctcm_main.c b/drivers/s390/net/ctcm_main.c
index c446883de5c8..fd705429708e 100644
--- a/drivers/s390/net/ctcm_main.c
+++ b/drivers/s390/net/ctcm_main.c
@@ -903,7 +903,7 @@ static int ctcmpc_tx(struct sk_buff *skb, struct net_device *dev)
 		CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
 
 		len =  skb->len + TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
-		newskb = __dev_alloc_skb(len, gfp_type() | GFP_DMA);
+		newskb = __dev_alloc_skb(len, GFP_ATOMIC | GFP_DMA);
 
 		if (!newskb) {
 			CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
diff --git a/drivers/s390/net/ctcm_main.h b/drivers/s390/net/ctcm_main.h
index 16bdf23ee02b..90bd7b3f80c3 100644
--- a/drivers/s390/net/ctcm_main.h
+++ b/drivers/s390/net/ctcm_main.h
@@ -298,11 +298,6 @@ struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv);
 /* test if struct ctcm_priv of struct net_device has MPC protocol setting */
 #define IS_MPCDEV(dev) IS_MPC((struct ctcm_priv *)dev->ml_priv)
 
-static inline gfp_t gfp_type(void)
-{
-	return in_interrupt() ? GFP_ATOMIC : GFP_KERNEL;
-}
-
 /*
  * Definition of our link level header.
  */
-- 
cgit v1.2.3


From 04ea30c857217eb69451f8ced5a857693666ae16 Mon Sep 17 00:00:00 2001
From: Julian Wiedmann
Date: Mon, 7 Dec 2020 14:12:28 +0100
Subject: s390/qeth: don't call INIT_LIST_HEAD() on iob's list entry

INIT_LIST_HEAD() only needs to be called on actual list heads.
While at it clarify the naming of the field.

Suggested-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 drivers/s390/net/qeth_core.h      | 2 +-
 drivers/s390/net/qeth_core_main.c | 9 ++++-----
 2 files changed, 5 insertions(+), 6 deletions(-)

(limited to 'drivers/s390')

diff --git a/drivers/s390/net/qeth_core.h b/drivers/s390/net/qeth_core.h
index 0e9af2fbaa76..69b474f8735e 100644
--- a/drivers/s390/net/qeth_core.h
+++ b/drivers/s390/net/qeth_core.h
@@ -624,7 +624,7 @@ struct qeth_reply {
 };
 
 struct qeth_cmd_buffer {
-	struct list_head list;
+	struct list_head list_entry;
 	struct completion done;
 	spinlock_t lock;
 	unsigned int length;
diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
index 319190824cd2..8171b9d3a70e 100644
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -615,7 +615,7 @@ static void qeth_enqueue_cmd(struct qeth_card *card,
 			     struct qeth_cmd_buffer *iob)
 {
 	spin_lock_irq(&card->lock);
-	list_add_tail(&iob->list, &card->cmd_waiter_list);
+	list_add_tail(&iob->list_entry, &card->cmd_waiter_list);
 	spin_unlock_irq(&card->lock);
 }
 
@@ -623,7 +623,7 @@ static void qeth_dequeue_cmd(struct qeth_card *card,
 			     struct qeth_cmd_buffer *iob)
 {
 	spin_lock_irq(&card->lock);
-	list_del(&iob->list);
+	list_del(&iob->list_entry);
 	spin_unlock_irq(&card->lock);
 }
 
@@ -977,7 +977,7 @@ static void qeth_clear_ipacmd_list(struct qeth_card *card)
 	QETH_CARD_TEXT(card, 4, "clipalst");
 
 	spin_lock_irqsave(&card->lock, flags);
-	list_for_each_entry(iob, &card->cmd_waiter_list, list)
+	list_for_each_entry(iob, &card->cmd_waiter_list, list_entry)
 		qeth_notify_cmd(iob, -ECANCELED);
 	spin_unlock_irqrestore(&card->lock, flags);
 }
@@ -1047,7 +1047,6 @@ struct qeth_cmd_buffer *qeth_alloc_cmd(struct qeth_channel *channel,
 
 	init_completion(&iob->done);
 	spin_lock_init(&iob->lock);
-	INIT_LIST_HEAD(&iob->list);
 	refcount_set(&iob->ref_count, 1);
 	iob->channel = channel;
 	iob->timeout = timeout;
@@ -1094,7 +1093,7 @@ static void qeth_issue_next_read_cb(struct qeth_card *card,
 
 	/* match against pending cmd requests */
 	spin_lock_irqsave(&card->lock, flags);
-	list_for_each_entry(tmp, &card->cmd_waiter_list, list) {
+	list_for_each_entry(tmp, &card->cmd_waiter_list, list_entry) {
 		if (tmp->match && tmp->match(tmp, iob)) {
 			request = tmp;
 			/* take the object outside the lock */
-- 
cgit v1.2.3


From 050663129a6d70a178a8545c31bc715bfb915355 Mon Sep 17 00:00:00 2001
From: Julian Wiedmann
Date: Mon, 7 Dec 2020 14:12:29 +0100
Subject: s390/ccwgroup: use bus->dev_groups for bus-based sysfs attributes

Bus drivers have their own way of describing the sysfs attributes that
all devices on a bus should provide.
Switch ccwgroup_attr_groups over to use bus->dev_groups, and thus
free up dev->groups for usage by the ccwgroup device drivers.

While adjusting the attribute naming, use ATTRIBUTE_GROUPS() to get rid
of some boilerplate code.

Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 drivers/s390/cio/ccwgroup.c | 12 +++---------
 1 file changed, 3 insertions(+), 9 deletions(-)

(limited to 'drivers/s390')

diff --git a/drivers/s390/cio/ccwgroup.c b/drivers/s390/cio/ccwgroup.c
index 483a9ecfcbb1..444385da5792 100644
--- a/drivers/s390/cio/ccwgroup.c
+++ b/drivers/s390/cio/ccwgroup.c
@@ -210,18 +210,12 @@ out:
 static DEVICE_ATTR(ungroup, 0200, NULL, ccwgroup_ungroup_store);
 static DEVICE_ATTR(online, 0644, ccwgroup_online_show, ccwgroup_online_store);
 
-static struct attribute *ccwgroup_attrs[] = {
+static struct attribute *ccwgroup_dev_attrs[] = {
 	&dev_attr_online.attr,
 	&dev_attr_ungroup.attr,
 	NULL,
 };
-static struct attribute_group ccwgroup_attr_group = {
-	.attrs = ccwgroup_attrs,
-};
-static const struct attribute_group *ccwgroup_attr_groups[] = {
-	&ccwgroup_attr_group,
-	NULL,
-};
+ATTRIBUTE_GROUPS(ccwgroup_dev);
 
 static void ccwgroup_ungroup_workfn(struct work_struct *work)
 {
@@ -384,7 +378,6 @@ int ccwgroup_create_dev(struct device *parent, struct ccwgroup_driver *gdrv,
 	}
 
 	dev_set_name(&gdev->dev, "%s", dev_name(&gdev->cdev[0]->dev));
-	gdev->dev.groups = ccwgroup_attr_groups;
 
 	if (gdrv) {
 		gdev->dev.driver = &gdrv->driver;
@@ -487,6 +480,7 @@ static void ccwgroup_shutdown(struct device *dev)
 
 static struct bus_type ccwgroup_bus_type = {
 	.name   = "ccwgroup",
+	.dev_groups = ccwgroup_dev_groups,
 	.remove = ccwgroup_remove,
 	.shutdown = ccwgroup_shutdown,
 };
-- 
cgit v1.2.3


From 0b8da8110b4fa3314a060e5c5a3b35a22b81e900 Mon Sep 17 00:00:00 2001
From: Julian Wiedmann
Date: Mon, 7 Dec 2020 14:12:30 +0100
Subject: s390/qeth: use dev->groups for common sysfs attributes

All qeth devices have a minimum set of sysfs attributes, and non-OSN
devices share a group of additional attributes. Depending on whether
the device is forced to use a specific discipline, the device_type then
specifies further attributes.

Shift the common attributes into dev->groups, so that the device_type
only contains the discipline-specific attributes. This avoids exposing
the common attributes to the disciplines, and nicely cleans up our
sysfs code.

While replacing the qeth_l*_*_device_attributes() helpers, switch from
sysfs_*_groups() to the more generic device_*_groups().

Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 drivers/s390/net/qeth_core.h      |  6 ++----
 drivers/s390/net/qeth_core_main.c |  7 +++++--
 drivers/s390/net/qeth_core_sys.c  | 41 ++++++++++++++++++---------------------
 drivers/s390/net/qeth_l2.h        |  2 --
 drivers/s390/net/qeth_l2_main.c   |  4 ++--
 drivers/s390/net/qeth_l2_sys.c    | 19 ------------------
 drivers/s390/net/qeth_l3.h        |  2 --
 drivers/s390/net/qeth_l3_main.c   |  4 ++--
 drivers/s390/net/qeth_l3_sys.c    | 21 --------------------
 9 files changed, 30 insertions(+), 76 deletions(-)

(limited to 'drivers/s390')

diff --git a/drivers/s390/net/qeth_core.h b/drivers/s390/net/qeth_core.h
index 69b474f8735e..d150da95d073 100644
--- a/drivers/s390/net/qeth_core.h
+++ b/drivers/s390/net/qeth_core.h
@@ -1063,10 +1063,8 @@ extern const struct qeth_discipline qeth_l2_discipline;
 extern const struct qeth_discipline qeth_l3_discipline;
 extern const struct ethtool_ops qeth_ethtool_ops;
 extern const struct ethtool_ops qeth_osn_ethtool_ops;
-extern const struct attribute_group *qeth_generic_attr_groups[];
-extern const struct attribute_group *qeth_osn_attr_groups[];
-extern const struct attribute_group qeth_device_attr_group;
-extern const struct attribute_group qeth_device_blkt_group;
+extern const struct attribute_group *qeth_dev_groups[];
+extern const struct attribute_group *qeth_osn_dev_groups[];
 extern const struct device_type qeth_generic_devtype;
 
 const char *qeth_get_cardname_short(struct qeth_card *);
diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
index 8171b9d3a70e..05d0b16bd7d6 100644
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -6375,13 +6375,11 @@ void qeth_core_free_discipline(struct qeth_card *card)
 
 const struct device_type qeth_generic_devtype = {
 	.name = "qeth_generic",
-	.groups = qeth_generic_attr_groups,
 };
 EXPORT_SYMBOL_GPL(qeth_generic_devtype);
 
 static const struct device_type qeth_osn_devtype = {
 	.name = "qeth_osn",
-	.groups = qeth_osn_attr_groups,
 };
 
 #define DBF_NAME_LEN	20
@@ -6561,6 +6559,11 @@ static int qeth_core_probe_device(struct ccwgroup_device *gdev)
 	if (rc)
 		goto err_chp_desc;
 
+	if (IS_OSN(card))
+		gdev->dev.groups = qeth_osn_dev_groups;
+	else
+		gdev->dev.groups = qeth_dev_groups;
+
 	enforced_disc = qeth_enforce_discipline(card);
 	switch (enforced_disc) {
 	case QETH_DISCIPLINE_UNDETERMINED:
diff --git a/drivers/s390/net/qeth_core_sys.c b/drivers/s390/net/qeth_core_sys.c
index 4441b3393eaf..a0f777f76f66 100644
--- a/drivers/s390/net/qeth_core_sys.c
+++ b/drivers/s390/net/qeth_core_sys.c
@@ -640,23 +640,17 @@ static struct attribute *qeth_blkt_device_attrs[] = {
 	&dev_attr_inter_jumbo.attr,
 	NULL,
 };
-const struct attribute_group qeth_device_blkt_group = {
+
+static const struct attribute_group qeth_dev_blkt_group = {
 	.name = "blkt",
 	.attrs = qeth_blkt_device_attrs,
 };
-EXPORT_SYMBOL_GPL(qeth_device_blkt_group);
 
-static struct attribute *qeth_device_attrs[] = {
-	&dev_attr_state.attr,
-	&dev_attr_chpid.attr,
-	&dev_attr_if_name.attr,
-	&dev_attr_card_type.attr,
+static struct attribute *qeth_dev_extended_attrs[] = {
 	&dev_attr_inbuf_size.attr,
 	&dev_attr_portno.attr,
 	&dev_attr_portname.attr,
 	&dev_attr_priority_queueing.attr,
-	&dev_attr_buffer_count.attr,
-	&dev_attr_recover.attr,
 	&dev_attr_performance_stats.attr,
 	&dev_attr_layer2.attr,
 	&dev_attr_isolation.attr,
@@ -664,18 +658,12 @@ static struct attribute *qeth_device_attrs[] = {
 	&dev_attr_switch_attrs.attr,
 	NULL,
 };
-const struct attribute_group qeth_device_attr_group = {
-	.attrs = qeth_device_attrs,
-};
-EXPORT_SYMBOL_GPL(qeth_device_attr_group);
 
-const struct attribute_group *qeth_generic_attr_groups[] = {
-	&qeth_device_attr_group,
-	&qeth_device_blkt_group,
-	NULL,
+static const struct attribute_group qeth_dev_extended_group = {
+	.attrs = qeth_dev_extended_attrs,
 };
 
-static struct attribute *qeth_osn_device_attrs[] = {
+static struct attribute *qeth_dev_attrs[] = {
 	&dev_attr_state.attr,
 	&dev_attr_chpid.attr,
 	&dev_attr_if_name.attr,
@@ -684,10 +672,19 @@ static struct attribute *qeth_osn_device_attrs[] = {
 	&dev_attr_recover.attr,
 	NULL,
 };
-static struct attribute_group qeth_osn_device_attr_group = {
-	.attrs = qeth_osn_device_attrs,
+
+static const struct attribute_group qeth_dev_group = {
+	.attrs = qeth_dev_attrs,
 };
-const struct attribute_group *qeth_osn_attr_groups[] = {
-	&qeth_osn_device_attr_group,
+
+const struct attribute_group *qeth_osn_dev_groups[] = {
+	&qeth_dev_group,
+	NULL,
+};
+
+const struct attribute_group *qeth_dev_groups[] = {
+	&qeth_dev_group,
+	&qeth_dev_extended_group,
+	&qeth_dev_blkt_group,
 	NULL,
 };
diff --git a/drivers/s390/net/qeth_l2.h b/drivers/s390/net/qeth_l2.h
index 296d73d84326..7c646e2fed7e 100644
--- a/drivers/s390/net/qeth_l2.h
+++ b/drivers/s390/net/qeth_l2.h
@@ -11,8 +11,6 @@
 
 extern const struct attribute_group *qeth_l2_attr_groups[];
 
-int qeth_l2_create_device_attributes(struct device *);
-void qeth_l2_remove_device_attributes(struct device *);
 int qeth_bridgeport_query_ports(struct qeth_card *card,
 				enum qeth_sbp_roles *role,
 				enum qeth_sbp_states *state);
diff --git a/drivers/s390/net/qeth_l2_main.c b/drivers/s390/net/qeth_l2_main.c
index 393aef681e44..4ed0fb0705a5 100644
--- a/drivers/s390/net/qeth_l2_main.c
+++ b/drivers/s390/net/qeth_l2_main.c
@@ -2189,7 +2189,7 @@ static int qeth_l2_probe_device(struct ccwgroup_device *gdev)
 	mutex_init(&card->sbp_lock);
 
 	if (gdev->dev.type == &qeth_generic_devtype) {
-		rc = qeth_l2_create_device_attributes(&gdev->dev);
+		rc = device_add_groups(&gdev->dev, qeth_l2_attr_groups);
 		if (rc)
 			return rc;
 	}
@@ -2203,7 +2203,7 @@ static void qeth_l2_remove_device(struct ccwgroup_device *gdev)
 	struct qeth_card *card = dev_get_drvdata(&gdev->dev);
 
 	if (gdev->dev.type == &qeth_generic_devtype)
-		qeth_l2_remove_device_attributes(&gdev->dev);
+		device_remove_groups(&gdev->dev, qeth_l2_attr_groups);
 	qeth_set_allowed_threads(card, 0, 1);
 	wait_event(card->wait_q, qeth_threads_running(card, 0xffffffff) == 0);
 
diff --git a/drivers/s390/net/qeth_l2_sys.c b/drivers/s390/net/qeth_l2_sys.c
index 4ba3bc57263f..a617351fff57 100644
--- a/drivers/s390/net/qeth_l2_sys.c
+++ b/drivers/s390/net/qeth_l2_sys.c
@@ -376,26 +376,7 @@ static struct attribute_group qeth_l2_vnicc_attr_group = {
 	.name = "vnicc",
 };
 
-static const struct attribute_group *qeth_l2_only_attr_groups[] = {
-	&qeth_l2_bridgeport_attr_group,
-	&qeth_l2_vnicc_attr_group,
-	NULL,
-};
-
-int qeth_l2_create_device_attributes(struct device *dev)
-{
-	return sysfs_create_groups(&dev->kobj, qeth_l2_only_attr_groups);
-}
-
-void qeth_l2_remove_device_attributes(struct device *dev)
-{
-	sysfs_remove_groups(&dev->kobj, qeth_l2_only_attr_groups);
-}
-
 const struct attribute_group *qeth_l2_attr_groups[] = {
-	&qeth_device_attr_group,
-	&qeth_device_blkt_group,
-	/* l2 specific, see qeth_l2_only_attr_groups: */
 	&qeth_l2_bridgeport_attr_group,
 	&qeth_l2_vnicc_attr_group,
 	NULL,
diff --git a/drivers/s390/net/qeth_l3.h b/drivers/s390/net/qeth_l3.h
index acd130cfbab3..30c2b31d99f6 100644
--- a/drivers/s390/net/qeth_l3.h
+++ b/drivers/s390/net/qeth_l3.h
@@ -103,8 +103,6 @@ extern const struct attribute_group *qeth_l3_attr_groups[];
 
 int qeth_l3_ipaddr_to_string(enum qeth_prot_versions proto, const u8 *addr,
 			     char *buf);
-int qeth_l3_create_device_attributes(struct device *);
-void qeth_l3_remove_device_attributes(struct device *);
 int qeth_l3_setrouting_v4(struct qeth_card *);
 int qeth_l3_setrouting_v6(struct qeth_card *);
 int qeth_l3_add_ipato_entry(struct qeth_card *, struct qeth_ipato_entry *);
diff --git a/drivers/s390/net/qeth_l3_main.c b/drivers/s390/net/qeth_l3_main.c
index 264b6c782382..d138ac432d01 100644
--- a/drivers/s390/net/qeth_l3_main.c
+++ b/drivers/s390/net/qeth_l3_main.c
@@ -1949,7 +1949,7 @@ static int qeth_l3_probe_device(struct ccwgroup_device *gdev)
 		return -ENOMEM;
 
 	if (gdev->dev.type == &qeth_generic_devtype) {
-		rc = qeth_l3_create_device_attributes(&gdev->dev);
+		rc = device_add_groups(&gdev->dev, qeth_l3_attr_groups);
 		if (rc) {
 			destroy_workqueue(card->cmd_wq);
 			return rc;
@@ -1965,7 +1965,7 @@ static void qeth_l3_remove_device(struct ccwgroup_device *cgdev)
 	struct qeth_card *card = dev_get_drvdata(&cgdev->dev);
 
 	if (cgdev->dev.type == &qeth_generic_devtype)
-		qeth_l3_remove_device_attributes(&cgdev->dev);
+		device_remove_groups(&cgdev->dev, qeth_l3_attr_groups);
 
 	qeth_set_allowed_threads(card, 0, 1);
 	wait_event(card->wait_q, qeth_threads_running(card, 0xffffffff) == 0);
diff --git a/drivers/s390/net/qeth_l3_sys.c b/drivers/s390/net/qeth_l3_sys.c
index 997fbb7006a7..1082380b21f8 100644
--- a/drivers/s390/net/qeth_l3_sys.c
+++ b/drivers/s390/net/qeth_l3_sys.c
@@ -805,28 +805,7 @@ static const struct attribute_group qeth_device_rxip_group = {
 	.attrs = qeth_rxip_device_attrs,
 };
 
-static const struct attribute_group *qeth_l3_only_attr_groups[] = {
-	&qeth_l3_device_attr_group,
-	&qeth_device_ipato_group,
-	&qeth_device_vipa_group,
-	&qeth_device_rxip_group,
-	NULL,
-};
-
-int qeth_l3_create_device_attributes(struct device *dev)
-{
-	return sysfs_create_groups(&dev->kobj, qeth_l3_only_attr_groups);
-}
-
-void qeth_l3_remove_device_attributes(struct device *dev)
-{
-	sysfs_remove_groups(&dev->kobj, qeth_l3_only_attr_groups);
-}
-
 const struct attribute_group *qeth_l3_attr_groups[] = {
-	&qeth_device_attr_group,
-	&qeth_device_blkt_group,
-	/* l3 specific, see qeth_l3_only_attr_groups: */
 	&qeth_l3_device_attr_group,
 	&qeth_device_ipato_group,
 	&qeth_device_vipa_group,
-- 
cgit v1.2.3


From db4ffdcef7c9a842e55228c9faef7abf8b72382f Mon Sep 17 00:00:00 2001
From: Julian Wiedmann
Date: Mon, 7 Dec 2020 14:12:31 +0100
Subject: s390/qeth: don't replace a fully completed async TX buffer

For TX buffers that require an additional async notification via QAOB, the
TX completion code can now manage all the necessary processing if the
notification has already occurred (or is occurring concurrently).

In such cases we can avoid replacing the metadata that is associated
with the buffer's slot on the ring, and just keep using the current one.

As qeth_clear_output_buffer() will also handle any kmem cache-allocated
memory that was mapped into the TX buffer, qeth_qdio_handle_aob()
doesn't need to worry about it.

While at it, also remove the unneeded forward declaration for
qeth_init_qdio_out_buf().

Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 drivers/s390/net/qeth_core_main.c | 89 ++++++++++++++++++++++-----------------
 1 file changed, 51 insertions(+), 38 deletions(-)

(limited to 'drivers/s390')

diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
index 05d0b16bd7d6..869694217450 100644
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -75,7 +75,6 @@ static void qeth_notify_skbs(struct qeth_qdio_out_q *queue,
 		enum iucv_tx_notify notification);
 static void qeth_tx_complete_buf(struct qeth_qdio_out_buffer *buf, bool error,
 				 int budget);
-static int qeth_init_qdio_out_buf(struct qeth_qdio_out_q *, int);
 
 static void qeth_close_dev_handler(struct work_struct *work)
 {
@@ -517,18 +516,6 @@ static void qeth_qdio_handle_aob(struct qeth_card *card,
 	buffer = (struct qeth_qdio_out_buffer *) aob->user1;
 	QETH_CARD_TEXT_(card, 5, "%lx", aob->user1);
 
-	/* Free dangling allocations. The attached skbs are handled by
-	 * qeth_cleanup_handled_pending().
-	 */
-	for (i = 0;
-	     i < aob->sb_count && i < QETH_MAX_BUFFER_ELEMENTS(card);
-	     i++) {
-		void *data = phys_to_virt(aob->sba[i]);
-
-		if (data && buffer->is_header[i])
-			kmem_cache_free(qeth_core_header_cache, data);
-	}
-
 	if (aob->aorc) {
 		QETH_CARD_TEXT_(card, 2, "aorc%02X", aob->aorc);
 		new_state = QETH_QDIO_BUF_QAOB_ERROR;
@@ -536,10 +523,9 @@ static void qeth_qdio_handle_aob(struct qeth_card *card,
 
 	switch (atomic_xchg(&buffer->state, new_state)) {
 	case QETH_QDIO_BUF_PRIMED:
-		/* Faster than TX completion code. */
-		notification = qeth_compute_cq_notification(aob->aorc, 0);
-		qeth_notify_skbs(buffer->q, buffer, notification);
-		atomic_set(&buffer->state, QETH_QDIO_BUF_HANDLED_DELAYED);
+		/* Faster than TX completion code, let it handle the async
+		 * completion for us.
+		 */
 		break;
 	case QETH_QDIO_BUF_PENDING:
 		/* TX completion code is active and will handle the async
@@ -550,6 +536,19 @@ static void qeth_qdio_handle_aob(struct qeth_card *card,
 		/* TX completion code is already finished. */
 		notification = qeth_compute_cq_notification(aob->aorc, 1);
 		qeth_notify_skbs(buffer->q, buffer, notification);
+
+		/* Free dangling allocations. The attached skbs are handled by
+		 * qeth_cleanup_handled_pending().
+		 */
+		for (i = 0;
+		     i < aob->sb_count && i < QETH_MAX_BUFFER_ELEMENTS(card);
+		     i++) {
+			void *data = phys_to_virt(aob->sba[i]);
+
+			if (data && buffer->is_header[i])
+				kmem_cache_free(qeth_core_header_cache, data);
+		}
+
 		atomic_set(&buffer->state, QETH_QDIO_BUF_HANDLED_DELAYED);
 		break;
 	default:
@@ -6078,9 +6077,13 @@ static void qeth_iqd_tx_complete(struct qeth_qdio_out_q *queue,
 				 QDIO_OUTBUF_STATE_FLAG_PENDING)) {
 		WARN_ON_ONCE(card->options.cq != QETH_CQ_ENABLED);
 
-		if (atomic_cmpxchg(&buffer->state, QETH_QDIO_BUF_PRIMED,
-						   QETH_QDIO_BUF_PENDING) ==
-		    QETH_QDIO_BUF_PRIMED) {
+		QETH_CARD_TEXT_(card, 5, "pel%u", bidx);
+
+		switch (atomic_cmpxchg(&buffer->state,
+				       QETH_QDIO_BUF_PRIMED,
+				       QETH_QDIO_BUF_PENDING)) {
+		case QETH_QDIO_BUF_PRIMED:
+			/* We have initial ownership, no QAOB (yet): */
 			qeth_notify_skbs(queue, buffer, TX_NOTIFY_PENDING);
 
 			/* Handle race with qeth_qdio_handle_aob(): */
@@ -6088,39 +6091,49 @@ static void qeth_iqd_tx_complete(struct qeth_qdio_out_q *queue,
 					    QETH_QDIO_BUF_NEED_QAOB)) {
 			case QETH_QDIO_BUF_PENDING:
 				/* No concurrent QAOB notification. */
-				break;
+
+				/* Prepare the queue slot for immediate re-use: */
+				qeth_scrub_qdio_buffer(buffer->buffer, queue->max_elements);
+				if (qeth_init_qdio_out_buf(queue, bidx)) {
+					QETH_CARD_TEXT(card, 2, "outofbuf");
+					qeth_schedule_recovery(card);
+				}
+
+				/* Skip clearing the buffer: */
+				return;
 			case QETH_QDIO_BUF_QAOB_OK:
 				qeth_notify_skbs(queue, buffer,
 						 TX_NOTIFY_DELAYED_OK);
-				atomic_set(&buffer->state,
-					   QETH_QDIO_BUF_HANDLED_DELAYED);
+				error = false;
 				break;
 			case QETH_QDIO_BUF_QAOB_ERROR:
 				qeth_notify_skbs(queue, buffer,
 						 TX_NOTIFY_DELAYED_GENERALERROR);
-				atomic_set(&buffer->state,
-					   QETH_QDIO_BUF_HANDLED_DELAYED);
+				error = true;
 				break;
 			default:
 				WARN_ON_ONCE(1);
 			}
-		}
-
-		QETH_CARD_TEXT_(card, 5, "pel%u", bidx);
 
-		/* prepare the queue slot for re-use: */
-		qeth_scrub_qdio_buffer(buffer->buffer, queue->max_elements);
-		if (qeth_init_qdio_out_buf(queue, bidx)) {
-			QETH_CARD_TEXT(card, 2, "outofbuf");
-			qeth_schedule_recovery(card);
+			break;
+		case QETH_QDIO_BUF_QAOB_OK:
+			/* qeth_qdio_handle_aob() already received a QAOB: */
+			qeth_notify_skbs(queue, buffer, TX_NOTIFY_OK);
+			error = false;
+			break;
+		case QETH_QDIO_BUF_QAOB_ERROR:
+			/* qeth_qdio_handle_aob() already received a QAOB: */
+			qeth_notify_skbs(queue, buffer, TX_NOTIFY_GENERALERROR);
+			error = true;
+			break;
+		default:
+			WARN_ON_ONCE(1);
 		}
-
-		return;
-	}
-
-	if (card->options.cq == QETH_CQ_ENABLED)
+	} else if (card->options.cq == QETH_CQ_ENABLED) {
 		qeth_notify_skbs(queue, buffer,
 				 qeth_compute_cq_notification(sflags, 0));
+	}
+
 	qeth_clear_output_buffer(queue, buffer, error, budget);
 }
 
-- 
cgit v1.2.3


From 75cf3854dcdf7b5c583538cae12ffa054d237d93 Mon Sep 17 00:00:00 2001
From: Julian Wiedmann
Date: Mon, 7 Dec 2020 14:12:32 +0100
Subject: s390/qeth: remove QETH_QDIO_BUF_HANDLED_DELAYED state

Reuse the QETH_QDIO_BUF_EMPTY state to indicate that a TX buffer has
been completed with a QAOB notification, and may be cleaned up by
qeth_cleanup_handled_pending().

Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 drivers/s390/net/qeth_core.h      | 2 --
 drivers/s390/net/qeth_core_main.c | 5 ++---
 2 files changed, 2 insertions(+), 5 deletions(-)

(limited to 'drivers/s390')

diff --git a/drivers/s390/net/qeth_core.h b/drivers/s390/net/qeth_core.h
index d150da95d073..6f5ddc3eab8c 100644
--- a/drivers/s390/net/qeth_core.h
+++ b/drivers/s390/net/qeth_core.h
@@ -424,8 +424,6 @@ enum qeth_qdio_out_buffer_state {
 	/* Received QAOB notification on CQ: */
 	QETH_QDIO_BUF_QAOB_OK,
 	QETH_QDIO_BUF_QAOB_ERROR,
-	/* Handled via transfer pending / completion queue. */
-	QETH_QDIO_BUF_HANDLED_DELAYED,
 };
 
 struct qeth_qdio_out_buffer {
diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
index 869694217450..da27ef451d05 100644
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -477,8 +477,7 @@ static void qeth_cleanup_handled_pending(struct qeth_qdio_out_q *q, int bidx,
 
 		while (c) {
 			if (forced_cleanup ||
-			    atomic_read(&c->state) ==
-			      QETH_QDIO_BUF_HANDLED_DELAYED) {
+			    atomic_read(&c->state) == QETH_QDIO_BUF_EMPTY) {
 				struct qeth_qdio_out_buffer *f = c;
 
 				QETH_CARD_TEXT(f->q->card, 5, "fp");
@@ -549,7 +548,7 @@ static void qeth_qdio_handle_aob(struct qeth_card *card,
 				kmem_cache_free(qeth_core_header_cache, data);
 		}
 
-		atomic_set(&buffer->state, QETH_QDIO_BUF_HANDLED_DELAYED);
+		atomic_set(&buffer->state, QETH_QDIO_BUF_EMPTY);
 		break;
 	default:
 		WARN_ON_ONCE(1);
-- 
cgit v1.2.3


From d2e46004c5cdaec4befa3c1a071bb9fa7fdbbcc5 Mon Sep 17 00:00:00 2001
From: Julian Wiedmann
Date: Mon, 7 Dec 2020 14:12:33 +0100
Subject: s390/qeth: make qeth_qdio_handle_aob() more robust

When qeth_qdio_handle_aob() frees dangling allocations in the notified
TX buffer, there are rare tear-down cases where
qeth_drain_output_queue() would later call qeth_clear_output_buffer()
for the same buffer - and thus end up walking the buffer a second time
to check for dangling kmem_cache allocations.

Luckily current code previously scrubs such a buffer, so
qeth_clear_output_buffer() would find buf->buffer->element[i].addr as
NULL and not do anything. But this is fragile, and we can easily improve
it by consistently clearing the ->is_header flag after freeing the
allocation.

Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 drivers/s390/net/qeth_core_main.c | 1 +
 1 file changed, 1 insertion(+)

(limited to 'drivers/s390')

diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
index da27ef451d05..f4b60294a969 100644
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -546,6 +546,7 @@ static void qeth_qdio_handle_aob(struct qeth_card *card,
 
 			if (data && buffer->is_header[i])
 				kmem_cache_free(qeth_core_header_cache, data);
+			buffer->is_header[i] = 0;
 		}
 
 		atomic_set(&buffer->state, QETH_QDIO_BUF_EMPTY);
-- 
cgit v1.2.3