[PATCH net 0/3] s390/qeth: fixes 2019-12-18

[PATCH net 0/3] s390/qeth: fixes 2019-12-18

[Julian Wiedmann]

Hi Dave,

please apply the following patch series to your net tree.
This brings two fixes for initialization / teardown issues, and one
ENOTSUPP cleanup.

Thanks,
Julian


Julian Wiedmann (3):
  s390/qeth: handle error due to unsupported transport mode
  s390/qeth: fix promiscuous mode after reset
  s390/qeth: don't return -ENOTSUPP to userspace

 drivers/s390/net/qeth_core_main.c | 14 +++++++-------
 drivers/s390/net/qeth_core_mpc.h  |  5 +++++
 drivers/s390/net/qeth_core_sys.c  |  2 +-
 drivers/s390/net/qeth_l2_main.c   |  1 +
 drivers/s390/net/qeth_l2_sys.c    |  3 ++-
 drivers/s390/net/qeth_l3_main.c   |  1 +
 6 files changed, 17 insertions(+), 9 deletions(-)

-- 
2.17.1

[PATCH net 1/3] s390/qeth: handle error due to unsupported transport mode

[Julian Wiedmann]

Along with z/VM NICs, there's additional device types that only support
a specific transport mode (eg. external-bridged IQD).
Identify the corresponding error code, and raise a fitting error message
so that the user knows to adjust their device configuration.

On top of that also fix the subsequent error path, so that the rejected
cmd doesn't need to wait for a timeout but gets cancelled straight away.

Fixes: 4a71df50047f ("qeth: new qeth device driver")
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
---
 drivers/s390/net/qeth_core_main.c | 14 +++++++-------
 drivers/s390/net/qeth_core_mpc.h  |  5 +++++
 2 files changed, 12 insertions(+), 7 deletions(-)

diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
index b9a2349e4b90..bb406eacef82 100644
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -655,17 +655,17 @@ static int qeth_check_idx_response(struct qeth_card *card,
 	unsigned char *buffer)
 {
 	QETH_DBF_HEX(CTRL, 2, buffer, QETH_DBF_CTRL_LEN);
-	if ((buffer[2] & 0xc0) == 0xc0) {
+	if ((buffer[2] & QETH_IDX_TERMINATE_MASK) == QETH_IDX_TERMINATE) {
 		QETH_DBF_MESSAGE(2, "received an IDX TERMINATE with cause code %#04x\n",
 				 buffer[4]);
 		QETH_CARD_TEXT(card, 2, "ckidxres");
 		QETH_CARD_TEXT(card, 2, " idxterm");
-		QETH_CARD_TEXT_(card, 2, "  rc%d", -EIO);
-		if (buffer[4] == 0xf6) {
+		QETH_CARD_TEXT_(card, 2, "rc%x", buffer[4]);
+		if (buffer[4] == QETH_IDX_TERM_BAD_TRANSPORT ||
+		    buffer[4] == QETH_IDX_TERM_BAD_TRANSPORT_VM) {
 			dev_err(&card->gdev->dev,
-			"The qeth device is not configured "
-			"for the OSI layer required by z/VM\n");
-			return -EPERM;
+				"The device does not support the configured transport mode\n");
+			return -EPROTONOSUPPORT;
 		}
 		return -EIO;
 	}
@@ -742,10 +742,10 @@ static void qeth_issue_next_read_cb(struct qeth_card *card,
 	case 0:
 		break;
 	case -EIO:
-		qeth_clear_ipacmd_list(card);
 		qeth_schedule_recovery(card);
 		/* fall through */
 	default:
+		qeth_clear_ipacmd_list(card);
 		goto out;
 	}
 
diff --git a/drivers/s390/net/qeth_core_mpc.h b/drivers/s390/net/qeth_core_mpc.h
index 88f4dc140751..6f5290fabd2c 100644
--- a/drivers/s390/net/qeth_core_mpc.h
+++ b/drivers/s390/net/qeth_core_mpc.h
@@ -899,6 +899,11 @@ extern unsigned char IDX_ACTIVATE_WRITE[];
 #define QETH_IDX_ACT_ERR_AUTH		0x1E
 #define QETH_IDX_ACT_ERR_AUTH_USER	0x20
 
+#define QETH_IDX_TERMINATE		0xc0
+#define QETH_IDX_TERMINATE_MASK		0xc0
+#define QETH_IDX_TERM_BAD_TRANSPORT	0x41
+#define QETH_IDX_TERM_BAD_TRANSPORT_VM	0xf6
+
 #define PDU_ENCAPSULATION(buffer) \
 	(buffer + *(buffer + (*(buffer + 0x0b)) + \
 	 *(buffer + *(buffer + 0x0b) + 0x11) + 0x07))
-- 
2.17.1

[PATCH net 2/3] s390/qeth: fix promiscuous mode after reset

[Julian Wiedmann]

When managing the promiscuous mode during an RX modeset, qeth caches the
current HW state to avoid repeated programming of the same state on each
modeset.

But while tearing down a device, we forget to clear the cached state. So
when the device is later set online again, the initial RX modeset
doesn't program the promiscuous mode since we believe it is already
enabled.
Fix this by clearing the cached state in the tear-down path.

Note that for the SBP variant of promiscuous mode, this accidentally
works right now because we unconditionally restore the SBP role while
re-initializing.

Fixes: 4a71df50047f ("qeth: new qeth device driver")
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Reviewed-by: Alexandra Winter <wintera@linux.ibm.com>
---
 drivers/s390/net/qeth_l2_main.c | 1 +
 drivers/s390/net/qeth_l2_sys.c  | 3 ++-
 drivers/s390/net/qeth_l3_main.c | 1 +
 3 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/s390/net/qeth_l2_main.c b/drivers/s390/net/qeth_l2_main.c
index 9086bc04fa6b..8c95e6019bac 100644
--- a/drivers/s390/net/qeth_l2_main.c
+++ b/drivers/s390/net/qeth_l2_main.c
@@ -295,6 +295,7 @@ static void qeth_l2_stop_card(struct qeth_card *card)
 
 	flush_workqueue(card->event_wq);
 	card->info.mac_bits &= ~QETH_LAYER2_MAC_REGISTERED;
+	card->info.promisc_mode = 0;
 }
 
 static int qeth_l2_process_inbound_buffer(struct qeth_card *card,
diff --git a/drivers/s390/net/qeth_l2_sys.c b/drivers/s390/net/qeth_l2_sys.c
index f70c7aac2dcc..7fa325cf6f8d 100644
--- a/drivers/s390/net/qeth_l2_sys.c
+++ b/drivers/s390/net/qeth_l2_sys.c
@@ -262,7 +262,8 @@ void qeth_l2_setup_bridgeport_attrs(struct qeth_card *card)
 		return;
 
 	mutex_lock(&card->sbp_lock);
-	if (card->options.sbp.role != QETH_SBP_ROLE_NONE) {
+	if (!card->options.sbp.reflect_promisc &&
+	    card->options.sbp.role != QETH_SBP_ROLE_NONE) {
 		/* Conditional to avoid spurious error messages */
 		qeth_bridgeport_setrole(card, card->options.sbp.role);
 		/* Let the callback function refresh the stored role value. */
diff --git a/drivers/s390/net/qeth_l3_main.c b/drivers/s390/net/qeth_l3_main.c
index 27126330a4b0..04e301de376f 100644
--- a/drivers/s390/net/qeth_l3_main.c
+++ b/drivers/s390/net/qeth_l3_main.c
@@ -1314,6 +1314,7 @@ static void qeth_l3_stop_card(struct qeth_card *card)
 	}
 
 	flush_workqueue(card->event_wq);
+	card->info.promisc_mode = 0;
 }
 
 static void qeth_l3_set_promisc_mode(struct qeth_card *card)
-- 
2.17.1

[PATCH net 3/3] s390/qeth: don't return -ENOTSUPP to userspace

[Julian Wiedmann]

ENOTSUPP is not uapi, use EOPNOTSUPP instead.

Fixes: d66cb37e9664 ("qeth: Add new priority queueing options")
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
---
 drivers/s390/net/qeth_core_sys.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/s390/net/qeth_core_sys.c b/drivers/s390/net/qeth_core_sys.c
index e81170ab6d9a..7bd86027f559 100644
--- a/drivers/s390/net/qeth_core_sys.c
+++ b/drivers/s390/net/qeth_core_sys.c
@@ -207,7 +207,7 @@ static ssize_t qeth_dev_prioqing_store(struct device *dev,
 		card->qdio.default_out_queue = QETH_DEFAULT_QUEUE;
 	} else if (sysfs_streq(buf, "prio_queueing_vlan")) {
 		if (IS_LAYER3(card)) {
-			rc = -ENOTSUPP;
+			rc = -EOPNOTSUPP;
 			goto out;
 		}
 		card->qdio.do_prio_queueing = QETH_PRIO_Q_ING_VLAN;
-- 
2.17.1

Re: [PATCH net 0/3] s390/qeth: fixes 2019-12-18

[David Miller]

From: Julian Wiedmann <jwi@linux.ibm.com>
Date: Wed, 18 Dec 2019 16:32:25 +0100

> please apply the following patch series to your net tree.
> This brings two fixes for initialization / teardown issues, and one
> ENOTSUPP cleanup.

Series applied, thanks.