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authorSebastian Ott <sebott@linux.vnet.ibm.com>2014-06-27 17:09:25 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2014-07-22 09:26:15 +0200
commitd445a4e28c0ff740e946ae22860be85428814c39 (patch)
tree500daa23bf7efe87fa5e1bbb91f77994f041e787 /drivers/s390/net
parents390/qeth: extract qdio buffers from input buffer struct (diff)
downloadlinux-d445a4e28c0ff740e946ae22860be85428814c39.tar.xz
linux-d445a4e28c0ff740e946ae22860be85428814c39.zip
s390/qeth: extract qdio buffers from output buffer struct
Because of the embedded qdio_buffer array struct qeth_qdio_out_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 34K. 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>
Diffstat (limited to 'drivers/s390/net')
-rw-r--r--drivers/s390/net/qeth_core.h4
-rw-r--r--drivers/s390/net/qeth_core_main.c91
2 files changed, 58 insertions, 37 deletions
diff --git a/drivers/s390/net/qeth_core.h b/drivers/s390/net/qeth_core.h
index 4f9a3180f663..4b32608e79f9 100644
--- a/drivers/s390/net/qeth_core.h
+++ b/drivers/s390/net/qeth_core.h
@@ -465,7 +465,7 @@ enum qeth_out_q_states {
};
struct qeth_qdio_out_q {
- struct qdio_buffer qdio_bufs[QDIO_MAX_BUFFERS_PER_Q];
+ struct qdio_buffer *qdio_bufs[QDIO_MAX_BUFFERS_PER_Q];
struct qeth_qdio_out_buffer *bufs[QDIO_MAX_BUFFERS_PER_Q];
struct qdio_outbuf_state *bufstates; /* convenience pointer */
int queue_no;
@@ -483,7 +483,7 @@ struct qeth_qdio_out_q {
atomic_t used_buffers;
/* indicates whether PCI flag must be set (or if one is outstanding) */
atomic_t set_pci_flags_count;
-} __attribute__ ((aligned(256)));
+};
struct qeth_qdio_info {
atomic_t state;
diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
index acedba8539e4..bececacbc836 100644
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -1302,35 +1302,6 @@ static void qeth_free_buffer_pool(struct qeth_card *card)
}
}
-static void qeth_free_qdio_buffers(struct qeth_card *card)
-{
- int i, j;
-
- if (atomic_xchg(&card->qdio.state, QETH_QDIO_UNINITIALIZED) ==
- QETH_QDIO_UNINITIALIZED)
- return;
-
- qeth_free_cq(card);
- cancel_delayed_work_sync(&card->buffer_reclaim_work);
- for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; ++j) {
- if (card->qdio.in_q->bufs[j].rx_skb)
- dev_kfree_skb_any(card->qdio.in_q->bufs[j].rx_skb);
- }
- qeth_free_qdio_queue(card->qdio.in_q);
- card->qdio.in_q = NULL;
- /* inbound buffer pool */
- qeth_free_buffer_pool(card);
- /* free outbound qdio_qs */
- if (card->qdio.out_qs) {
- for (i = 0; i < card->qdio.no_out_queues; ++i) {
- qeth_clear_outq_buffers(card->qdio.out_qs[i], 1);
- kfree(card->qdio.out_qs[i]);
- }
- kfree(card->qdio.out_qs);
- card->qdio.out_qs = NULL;
- }
-}
-
static void qeth_clean_channel(struct qeth_channel *channel)
{
int cnt;
@@ -2412,7 +2383,7 @@ static int qeth_init_qdio_out_buf(struct qeth_qdio_out_q *q, int bidx)
rc = -ENOMEM;
goto out;
}
- newbuf->buffer = &q->qdio_bufs[bidx];
+ newbuf->buffer = q->qdio_bufs[bidx];
skb_queue_head_init(&newbuf->skb_list);
lockdep_set_class(&newbuf->skb_list.lock, &qdio_out_skb_queue_key);
newbuf->q = q;
@@ -2431,6 +2402,28 @@ out:
return rc;
}
+static void qeth_free_qdio_out_buf(struct qeth_qdio_out_q *q)
+{
+ if (!q)
+ return;
+
+ qdio_free_buffers(q->qdio_bufs, QDIO_MAX_BUFFERS_PER_Q);
+ kfree(q);
+}
+
+static struct qeth_qdio_out_q *qeth_alloc_qdio_out_buf(void)
+{
+ struct qeth_qdio_out_q *q = kzalloc(sizeof(*q), GFP_KERNEL);
+
+ if (!q)
+ return NULL;
+
+ if (qdio_alloc_buffers(q->qdio_bufs, QDIO_MAX_BUFFERS_PER_Q)) {
+ kfree(q);
+ return NULL;
+ }
+ return q;
+}
static int qeth_alloc_qdio_buffers(struct qeth_card *card)
{
@@ -2458,8 +2451,7 @@ static int qeth_alloc_qdio_buffers(struct qeth_card *card)
if (!card->qdio.out_qs)
goto out_freepool;
for (i = 0; i < card->qdio.no_out_queues; ++i) {
- card->qdio.out_qs[i] = kzalloc(sizeof(struct qeth_qdio_out_q),
- GFP_KERNEL);
+ card->qdio.out_qs[i] = qeth_alloc_qdio_out_buf();
if (!card->qdio.out_qs[i])
goto out_freeoutq;
QETH_DBF_TEXT_(SETUP, 2, "outq %i", i);
@@ -2488,7 +2480,7 @@ out_freeoutqbufs:
}
out_freeoutq:
while (i > 0) {
- kfree(card->qdio.out_qs[--i]);
+ qeth_free_qdio_out_buf(card->qdio.out_qs[--i]);
qeth_clear_outq_buffers(card->qdio.out_qs[i], 1);
}
kfree(card->qdio.out_qs);
@@ -2503,6 +2495,35 @@ out_nomem:
return -ENOMEM;
}
+static void qeth_free_qdio_buffers(struct qeth_card *card)
+{
+ int i, j;
+
+ if (atomic_xchg(&card->qdio.state, QETH_QDIO_UNINITIALIZED) ==
+ QETH_QDIO_UNINITIALIZED)
+ return;
+
+ qeth_free_cq(card);
+ cancel_delayed_work_sync(&card->buffer_reclaim_work);
+ for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; ++j) {
+ if (card->qdio.in_q->bufs[j].rx_skb)
+ dev_kfree_skb_any(card->qdio.in_q->bufs[j].rx_skb);
+ }
+ qeth_free_qdio_queue(card->qdio.in_q);
+ card->qdio.in_q = NULL;
+ /* inbound buffer pool */
+ qeth_free_buffer_pool(card);
+ /* free outbound qdio_qs */
+ if (card->qdio.out_qs) {
+ for (i = 0; i < card->qdio.no_out_queues; ++i) {
+ qeth_clear_outq_buffers(card->qdio.out_qs[i], 1);
+ qeth_free_qdio_out_buf(card->qdio.out_qs[i]);
+ }
+ kfree(card->qdio.out_qs);
+ card->qdio.out_qs = NULL;
+ }
+}
+
static void qeth_create_qib_param_field(struct qeth_card *card,
char *param_field)
{
@@ -2823,8 +2844,8 @@ int qeth_init_qdio_queues(struct qeth_card *card)
/* outbound queue */
for (i = 0; i < card->qdio.no_out_queues; ++i) {
- memset(card->qdio.out_qs[i]->qdio_bufs, 0,
- QDIO_MAX_BUFFERS_PER_Q * sizeof(struct qdio_buffer));
+ qdio_reset_buffers(card->qdio.out_qs[i]->qdio_bufs,
+ QDIO_MAX_BUFFERS_PER_Q);
for (j = 0; j < QDIO_MAX_BUFFERS_PER_Q; ++j) {
qeth_clear_output_buffer(card->qdio.out_qs[i],
card->qdio.out_qs[i]->bufs[j],