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authorSebastian Ott <sebott@linux.vnet.ibm.com>2014-06-27 17:07:47 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2014-07-22 09:26:14 +0200
commit6d284bde2beef9d4d067281b08f86554f41de799 (patch)
tree435d84e5fa08b849fc31112884d54afad6e64de2
parent4601ba6c92b000dcda37c9d74587e3b88374c00c (diff)
downloadop-kernel-dev-6d284bde2beef9d4d067281b08f86554f41de799.zip
op-kernel-dev-6d284bde2beef9d4d067281b08f86554f41de799.tar.gz
s390/qeth: extract qdio buffers from input buffer struct
Because of the embedded qdio_buffer array struct qeth_qdio_q is quite large resulting in an order 4 allocation. This is likely to fail at runtime and wastes a lot of memory since the actual size is just about 36K. Since there is no need for this buffer to be contiguous split it up using qdio buffer helpers. Reported-by: Neale Ferguson <neale@sinenomine.net> Reviewed-by: Ursula Braun <ursula.braun@de.ibm.com> Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
-rw-r--r--drivers/s390/net/qeth_core.h4
-rw-r--r--drivers/s390/net/qeth_core_main.c21
2 files changed, 17 insertions, 8 deletions
diff --git a/drivers/s390/net/qeth_core.h b/drivers/s390/net/qeth_core.h
index a2088af..4f9a318 100644
--- a/drivers/s390/net/qeth_core.h
+++ b/drivers/s390/net/qeth_core.h
@@ -439,10 +439,10 @@ struct qeth_qdio_buffer {
};
struct qeth_qdio_q {
- struct qdio_buffer qdio_bufs[QDIO_MAX_BUFFERS_PER_Q];
+ struct qdio_buffer *qdio_bufs[QDIO_MAX_BUFFERS_PER_Q];
struct qeth_qdio_buffer bufs[QDIO_MAX_BUFFERS_PER_Q];
int next_buf_to_init;
-} __attribute__ ((aligned(256)));
+};
struct qeth_qdio_out_buffer {
struct qdio_buffer *buffer;
diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
index a0a6ad7..acedba8 100644
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -294,6 +294,10 @@ EXPORT_SYMBOL_GPL(qeth_realloc_buffer_pool);
static void qeth_free_qdio_queue(struct qeth_qdio_q *q)
{
+ if (!q)
+ return;
+
+ qdio_free_buffers(q->qdio_bufs, QDIO_MAX_BUFFERS_PER_Q);
kfree(q);
}
@@ -305,8 +309,13 @@ static struct qeth_qdio_q *qeth_alloc_qdio_queue(void)
if (!q)
return NULL;
+ if (qdio_alloc_buffers(q->qdio_bufs, QDIO_MAX_BUFFERS_PER_Q)) {
+ kfree(q);
+ return NULL;
+ }
+
for (i = 0; i < QDIO_MAX_BUFFERS_PER_Q; ++i)
- q->bufs[i].buffer = &q->qdio_bufs[i];
+ q->bufs[i].buffer = q->qdio_bufs[i];
QETH_DBF_HEX(SETUP, 2, &q, sizeof(void *));
return q;
@@ -318,8 +327,8 @@ static inline int qeth_cq_init(struct qeth_card *card)
if (card->options.cq == QETH_CQ_ENABLED) {
QETH_DBF_TEXT(SETUP, 2, "cqinit");
- memset(card->qdio.c_q->qdio_bufs, 0,
- QDIO_MAX_BUFFERS_PER_Q * sizeof(struct qdio_buffer));
+ qdio_reset_buffers(card->qdio.c_q->qdio_bufs,
+ QDIO_MAX_BUFFERS_PER_Q);
card->qdio.c_q->next_buf_to_init = 127;
rc = do_QDIO(CARD_DDEV(card), QDIO_FLAG_SYNC_INPUT,
card->qdio.no_in_queues - 1, 0,
@@ -2791,8 +2800,8 @@ int qeth_init_qdio_queues(struct qeth_card *card)
QETH_DBF_TEXT(SETUP, 2, "initqdqs");
/* inbound queue */
- memset(card->qdio.in_q->qdio_bufs, 0,
- QDIO_MAX_BUFFERS_PER_Q * sizeof(struct qdio_buffer));
+ qdio_reset_buffers(card->qdio.in_q->qdio_bufs,
+ QDIO_MAX_BUFFERS_PER_Q);
qeth_initialize_working_pool_list(card);
/*give only as many buffers to hardware as we have buffer pool entries*/
for (i = 0; i < card->qdio.in_buf_pool.buf_count - 1; ++i)
@@ -3533,7 +3542,7 @@ static void qeth_qdio_cq_handler(struct qeth_card *card,
for (i = first_element; i < first_element + count; ++i) {
int bidx = i % QDIO_MAX_BUFFERS_PER_Q;
- struct qdio_buffer *buffer = &cq->qdio_bufs[bidx];
+ struct qdio_buffer *buffer = cq->qdio_bufs[bidx];
int e;
e = 0;
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