From: Klaus-Dieter Wacker <kdwacker@xxxxxxxxxx>
Qeth HiperSockets support now retries sending of packets when the
IBM System z signals a temporary resource shortage (e.g. target
buffer full). The packet is enqueued into the device queue.
After 3 times of unsuccessful send the packet is dropped.
Signed-off-by: Klaus-Dieter Wacker <kdwacker@xxxxxxxxxx>
---
drivers/s390/net/qeth_core.h | 9 +++++
drivers/s390/net/qeth_core_main.c | 60 ++++++++++++++++++++++++++++++++------
2 files changed, 61 insertions(+), 8 deletions(-)
Index: git_net-next/drivers/s390/net/qeth_core.h
===================================================================
--- git_net-next.orig/drivers/s390/net/qeth_core.h
+++ git_net-next/drivers/s390/net/qeth_core.h
@@ -435,6 +435,7 @@ struct qeth_qdio_out_q {
* index of buffer to be filled by driver; state EMPTY or PACKING
*/
int next_buf_to_fill;
+ int sync_iqdio_error;
/*
* number of buffers that are currently filled (PRIMED)
* -> these buffers are hardware-owned
@@ -685,6 +686,14 @@ struct qeth_mc_mac {
int is_vmac;
};
+struct qeth_skb_data {
+ __u32 magic;
+ int count;
+};
+
+#define QETH_SKB_MAGIC 0x71657468
+#define QETH_SIGA_CC2_RETRIES 3
+
struct qeth_card {
struct list_head list;
enum qeth_card_states state;
Index: git_net-next/drivers/s390/net/qeth_core_main.c
===================================================================
--- git_net-next.orig/drivers/s390/net/qeth_core_main.c
+++ git_net-next/drivers/s390/net/qeth_core_main.c
@@ -927,8 +927,8 @@ out:
return;
}
-static void qeth_clear_output_buffer(struct qeth_qdio_out_q *queue,
- struct qeth_qdio_out_buffer *buf)
+static void __qeth_clear_output_buffer(struct qeth_qdio_out_q *queue,
+ struct qeth_qdio_out_buffer *buf, unsigned int qeth_skip_skb)
{
int i;
struct sk_buff *skb;
@@ -937,11 +937,13 @@ static void qeth_clear_output_buffer(str
if (buf->buffer->element[0].flags & 0x40)
atomic_dec(&queue->set_pci_flags_count);
- skb = skb_dequeue(&buf->skb_list);
- while (skb) {
- atomic_dec(&skb->users);
- dev_kfree_skb_any(skb);
+ if (!qeth_skip_skb) {
skb = skb_dequeue(&buf->skb_list);
+ while (skb) {
+ atomic_dec(&skb->users);
+ dev_kfree_skb_any(skb);
+ skb = skb_dequeue(&buf->skb_list);
+ }
}
for (i = 0; i < QETH_MAX_BUFFER_ELEMENTS(queue->card); ++i) {
if (buf->buffer->element[i].addr && buf->is_header[i])
@@ -957,6 +959,12 @@ static void qeth_clear_output_buffer(str
atomic_set(&buf->state, QETH_QDIO_BUF_EMPTY);
}
+static void qeth_clear_output_buffer(struct qeth_qdio_out_q *queue,
+ struct qeth_qdio_out_buffer *buf)
+{
+ __qeth_clear_output_buffer(queue, buf, 0);
+}
+
void qeth_clear_qdio_buffers(struct qeth_card *card)
{
int i, j;
@@ -2685,6 +2693,13 @@ static int qeth_handle_send_error(struct
int sbalf15 = buffer->buffer->element[15].flags & 0xff;
QETH_DBF_TEXT(TRACE, 6, "hdsnderr");
+ if (card->info.type == QETH_CARD_TYPE_IQD) {
+ if (sbalf15 == 0) {
+ qdio_err = 0;
+ } else {
+ qdio_err = 1;
+ }
+ }
qeth_check_qdio_errors(buffer->buffer, qdio_err, "qouterr");
if (!qdio_err)
@@ -2817,6 +2832,7 @@ static void qeth_flush_buffers(struct qe
}
}
+ queue->sync_iqdio_error = 0;
queue->card->dev->trans_start = jiffies;
if (queue->card->options.performance_stats) {
queue->card->perf_stats.outbound_do_qdio_cnt++;
@@ -2832,6 +2848,10 @@ static void qeth_flush_buffers(struct qe
queue->card->perf_stats.outbound_do_qdio_time +=
qeth_get_micros() -
queue->card->perf_stats.outbound_do_qdio_start_time;
+ if (rc > 0) {
+ if (!(rc & QDIO_ERROR_SIGA_BUSY))
+ queue->sync_iqdio_error = rc & 3;
+ }
if (rc) {
queue->card->stats.tx_errors += count;
/* ignore temporary SIGA errors without busy condition */
@@ -2899,6 +2919,7 @@ void qeth_qdio_output_handler(struct ccw
struct qeth_qdio_out_q *queue = card->qdio.out_qs[__queue];
struct qeth_qdio_out_buffer *buffer;
int i;
+ unsigned qeth_send_err;
QETH_DBF_TEXT(TRACE, 6, "qdouhdl");
if (qdio_error & QDIO_ERROR_ACTIVATE_CHECK_CONDITION) {
@@ -2915,8 +2936,9 @@ void qeth_qdio_output_handler(struct ccw
}
for (i = first_element; i < (first_element + count); ++i) {
buffer = &queue->bufs[i % QDIO_MAX_BUFFERS_PER_Q];
- qeth_handle_send_error(card, buffer, qdio_error);
- qeth_clear_output_buffer(queue, buffer);
+ qeth_send_err = qeth_handle_send_error(card, buffer, qdio_error);
+ __qeth_clear_output_buffer(queue, buffer,
+ (qeth_send_err == QETH_SEND_ERROR_RETRY) ? 1 : 0);
}
atomic_sub(count, &queue->used_buffers);
/* check if we need to do something on this outbound queue */
@@ -3159,7 +3181,10 @@ int qeth_do_send_packet_fast(struct qeth
int offset, int hd_len)
{
struct qeth_qdio_out_buffer *buffer;
+ struct sk_buff *skb1;
+ struct qeth_skb_data *retry_ctrl;
int index;
+ int rc;
/* spin until we get the queue ... */
while (atomic_cmpxchg(&queue->state, QETH_OUT_Q_UNLOCKED,
@@ -3178,6 +3203,25 @@ int qeth_do_send_packet_fast(struct qeth
atomic_set(&queue->state, QETH_OUT_Q_UNLOCKED);
qeth_fill_buffer(queue, buffer, skb, hdr, offset, hd_len);
qeth_flush_buffers(queue, index, 1);
+ if (queue->sync_iqdio_error == 2) {
+ skb1 = skb_dequeue(&buffer->skb_list);
+ while (skb1) {
+ atomic_dec(&skb1->users);
+ skb1 = skb_dequeue(&buffer->skb_list);
+ }
+ retry_ctrl = (struct qeth_skb_data *) &skb->cb[16];
+ if (retry_ctrl->magic != QETH_SKB_MAGIC) {
+ retry_ctrl->magic = QETH_SKB_MAGIC;
+ retry_ctrl->count = 0;
+ }
+ if (retry_ctrl->count < QETH_SIGA_CC2_RETRIES) {
+ retry_ctrl->count++;
+ rc = dev_queue_xmit(skb);
+ } else {
+ dev_kfree_skb_any(skb);
+ QETH_DBF_TEXT(QERR, 2, "qrdrop");
+ }
+ }
return 0;
out:
atomic_set(&queue->state, QETH_OUT_Q_UNLOCKED);
--
To unsubscribe from this list: send the line "unsubscribe linux-s390" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
