* [PATCH net 1/2] s390/qeth: fix underestimated count of buffer elements
2018-02-09 10:03 [PATCH net 0/2] s390/qeth: fixes 2018-02-09 Julian Wiedmann
@ 2018-02-09 10:03 ` Julian Wiedmann
2018-02-09 10:03 ` [PATCH net 2/2] s390/qeth: fix SETIP command handling Julian Wiedmann
2018-02-09 19:30 ` [PATCH net 0/2] s390/qeth: fixes 2018-02-09 David Miller
2 siblings, 0 replies; 4+ messages in thread
From: Julian Wiedmann @ 2018-02-09 10:03 UTC (permalink / raw)
To: David Miller
Cc: netdev, linux-s390, Martin Schwidefsky, Heiko Carstens,
Stefan Raspl, Ursula Braun, Julian Wiedmann
From: Ursula Braun <ubraun@linux.vnet.ibm.com>
For a memory range/skb where the last byte falls onto a page boundary
(ie. 'end' is of the form xxx...xxx001), the PFN_UP() part of the
calculation currently doesn't round up to the next PFN due to an
off-by-one error.
Thus qeth believes that the skb occupies one page less than it
actually does, and may select a IO buffer that doesn't have enough spare
buffer elements to fit all of the skb's data.
HW detects this as a malformed buffer descriptor, and raises an
exception which then triggers device recovery.
Fixes: 2863c61334aa ("qeth: refactor calculation of SBALE count")
Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
Signed-off-by: Julian Wiedmann <jwi@linux.vnet.ibm.com>
---
drivers/s390/net/qeth_core.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/s390/net/qeth_core.h b/drivers/s390/net/qeth_core.h
index db42107bf2f5..c33fbc4c2e91 100644
--- a/drivers/s390/net/qeth_core.h
+++ b/drivers/s390/net/qeth_core.h
@@ -846,7 +846,7 @@ struct qeth_trap_id {
*/
static inline int qeth_get_elements_for_range(addr_t start, addr_t end)
{
- return PFN_UP(end - 1) - PFN_DOWN(start);
+ return PFN_UP(end) - PFN_DOWN(start);
}
static inline int qeth_get_micros(void)
--
2.13.5
^ permalink raw reply related [flat|nested] 4+ messages in thread* [PATCH net 2/2] s390/qeth: fix SETIP command handling
2018-02-09 10:03 [PATCH net 0/2] s390/qeth: fixes 2018-02-09 Julian Wiedmann
2018-02-09 10:03 ` [PATCH net 1/2] s390/qeth: fix underestimated count of buffer elements Julian Wiedmann
@ 2018-02-09 10:03 ` Julian Wiedmann
2018-02-09 19:30 ` [PATCH net 0/2] s390/qeth: fixes 2018-02-09 David Miller
2 siblings, 0 replies; 4+ messages in thread
From: Julian Wiedmann @ 2018-02-09 10:03 UTC (permalink / raw)
To: David Miller
Cc: netdev, linux-s390, Martin Schwidefsky, Heiko Carstens,
Stefan Raspl, Ursula Braun, Julian Wiedmann
send_control_data() applies some special handling to SETIP v4 IPA
commands. But current code parses *all* command types for the SETIP
command code. Limit the command code check to IPA commands.
Fixes: 5b54e16f1a54 ("qeth: do not spin for SETIP ip assist command")
Signed-off-by: Julian Wiedmann <jwi@linux.vnet.ibm.com>
---
drivers/s390/net/qeth_core.h | 5 +++++
drivers/s390/net/qeth_core_main.c | 14 ++++++++------
2 files changed, 13 insertions(+), 6 deletions(-)
diff --git a/drivers/s390/net/qeth_core.h b/drivers/s390/net/qeth_core.h
index c33fbc4c2e91..959c65cf75d9 100644
--- a/drivers/s390/net/qeth_core.h
+++ b/drivers/s390/net/qeth_core.h
@@ -591,6 +591,11 @@ struct qeth_cmd_buffer {
void (*callback) (struct qeth_channel *, struct qeth_cmd_buffer *);
};
+static inline struct qeth_ipa_cmd *__ipa_cmd(struct qeth_cmd_buffer *iob)
+{
+ return (struct qeth_ipa_cmd *)(iob->data + IPA_PDU_HEADER_SIZE);
+}
+
/**
* definition of a qeth channel, used for read and write
*/
diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
index 6abd3bc285e4..ca72f3311004 100644
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -2120,7 +2120,7 @@ int qeth_send_control_data(struct qeth_card *card, int len,
unsigned long flags;
struct qeth_reply *reply = NULL;
unsigned long timeout, event_timeout;
- struct qeth_ipa_cmd *cmd;
+ struct qeth_ipa_cmd *cmd = NULL;
QETH_CARD_TEXT(card, 2, "sendctl");
@@ -2146,10 +2146,13 @@ int qeth_send_control_data(struct qeth_card *card, int len,
while (atomic_cmpxchg(&card->write.irq_pending, 0, 1)) ;
qeth_prepare_control_data(card, len, iob);
- if (IS_IPA(iob->data))
+ if (IS_IPA(iob->data)) {
+ cmd = __ipa_cmd(iob);
event_timeout = QETH_IPA_TIMEOUT;
- else
+ } else {
event_timeout = QETH_TIMEOUT;
+ }
+
timeout = jiffies + event_timeout;
QETH_CARD_TEXT(card, 6, "noirqpnd");
@@ -2174,9 +2177,8 @@ int qeth_send_control_data(struct qeth_card *card, int len,
/* we have only one long running ipassist, since we can ensure
process context of this command we can sleep */
- cmd = (struct qeth_ipa_cmd *)(iob->data+IPA_PDU_HEADER_SIZE);
- if ((cmd->hdr.command == IPA_CMD_SETIP) &&
- (cmd->hdr.prot_version == QETH_PROT_IPV4)) {
+ if (cmd && cmd->hdr.command == IPA_CMD_SETIP &&
+ cmd->hdr.prot_version == QETH_PROT_IPV4) {
if (!wait_event_timeout(reply->wait_q,
atomic_read(&reply->received), event_timeout))
goto time_err;
--
2.13.5
^ permalink raw reply related [flat|nested] 4+ messages in thread