diff options
| author | Julian Wiedmann | 2019-06-11 18:38:00 +0200 |
|---|---|---|
| committer | David S. Miller | 2019-06-14 07:39:32 +0200 |
| commit | d9b9f40bba7db1147e8069fd3eba711b2247ee67 (patch) | |
| tree | 0de606247851098ecb47f8e2f6293d8d4a9915f3 /drivers/s390/net/qeth_core.h | |
| parent | s390/qeth: command-chain the IDX sequence (diff) | |
| download | kernel-qcow2-linux-d9b9f40bba7db1147e8069fd3eba711b2247ee67.tar.gz kernel-qcow2-linux-d9b9f40bba7db1147e8069fd3eba711b2247ee67.tar.xz kernel-qcow2-linux-d9b9f40bba7db1147e8069fd3eba711b2247ee67.zip | |
s390/qeth: allocate a single cmd on read channel
We statically allocate 8 cmd buffers on the read channel, when the only
IO left that's still using them is the long-running READ.
Replace this with a single allocated cmd, that gets restarted whenever
the READ completed.
This introduces refcounting for allocated cmds, so that the READ cmd can
survive the IO completion.
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/s390/net/qeth_core.h')
| -rw-r--r-- | drivers/s390/net/qeth_core.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/s390/net/qeth_core.h b/drivers/s390/net/qeth_core.h index 962945a63235..5bcdede5e955 100644 --- a/drivers/s390/net/qeth_core.h +++ b/drivers/s390/net/qeth_core.h @@ -579,6 +579,7 @@ struct qeth_channel; struct qeth_cmd_buffer { enum qeth_cmd_buffer_state state; unsigned int length; + refcount_t ref_count; struct qeth_channel *channel; struct qeth_reply *reply; long timeout; @@ -588,6 +589,11 @@ struct qeth_cmd_buffer { void (*callback)(struct qeth_card *card, struct qeth_cmd_buffer *iob); }; +static inline void qeth_get_cmd(struct qeth_cmd_buffer *iob) +{ + refcount_inc(&iob->ref_count); +} + static inline struct qeth_ipa_cmd *__ipa_cmd(struct qeth_cmd_buffer *iob) { return (struct qeth_ipa_cmd *)(iob->data + IPA_PDU_HEADER_SIZE); @@ -771,6 +777,7 @@ struct qeth_card { enum qeth_card_states state; spinlock_t lock; struct ccwgroup_device *gdev; + struct qeth_cmd_buffer *read_cmd; struct qeth_channel read; struct qeth_channel write; struct qeth_channel data; |