qeth: HiperSockets Network Traffic Analyzer

New feature to trace HiperSockets network traffic for debugging
purposes.

Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com>
Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 56 insertions, 0 deletions

diff --git a/drivers/s390/net/qeth_l3_sys.c b/drivers/s390/net/qeth_l3_sys.c
index 3360b0941aa1..3f08b11274ae 100644
--- a/drivers/s390/net/qeth_l3_sys.c
+++ b/drivers/s390/net/qeth_l3_sys.c
@@ -319,6 +319,61 @@ static ssize_t qeth_l3_dev_checksum_store(struct device *dev,
 static DEVICE_ATTR(checksumming, 0644, qeth_l3_dev_checksum_show,
                 qeth_l3_dev_checksum_store);
 
+static ssize_t qeth_l3_dev_sniffer_show(struct device *dev,
+                struct device_attribute *attr, char *buf)
+{
+        struct qeth_card *card = dev_get_drvdata(dev);
+
+        if (!card)
+                return -EINVAL;
+
+        return sprintf(buf, "%i\n", card->options.sniffer ? 1 : 0);
+}
+
+static ssize_t qeth_l3_dev_sniffer_store(struct device *dev,
+                struct device_attribute *attr, const char *buf, size_t count)
+{
+        struct qeth_card *card = dev_get_drvdata(dev);
+        int ret;
+        unsigned long i;
+
+        if (!card)
+                return -EINVAL;
+
+        if (card->info.type != QETH_CARD_TYPE_IQD)
+                return -EPERM;
+
+        if ((card->state != CARD_STATE_DOWN) &&
+            (card->state != CARD_STATE_RECOVER))
+                return -EPERM;
+
+        ret = strict_strtoul(buf, 16, &i);
+        if (ret)
+                return -EINVAL;
+        switch (i) {
+        case 0:
+                card->options.sniffer = i;
+                break;
+        case 1:
+                ret = qdio_get_ssqd_desc(CARD_DDEV(card), &card->ssqd);
+                if (card->ssqd.qdioac2 & QETH_SNIFF_AVAIL) {
+                        card->options.sniffer = i;
+                        if (card->qdio.init_pool.buf_count !=
+                                        QETH_IN_BUF_COUNT_MAX)
+                                qeth_realloc_buffer_pool(card,
+                                        QETH_IN_BUF_COUNT_MAX);
+                        break;
+                } else
+                        return -EPERM;
+        default:   /* fall through */
+                return -EINVAL;
+        }
+        return count;
+}
+
+static DEVICE_ATTR(sniffer, 0644, qeth_l3_dev_sniffer_show,
+                qeth_l3_dev_sniffer_store);
+
 static ssize_t qeth_l3_dev_large_send_show(struct device *dev,
                                 struct device_attribute *attr, char *buf)
 {
@@ -373,6 +428,7 @@ static struct attribute *qeth_l3_device_attrs[] = {
         &dev_attr_broadcast_mode.attr,
         &dev_attr_canonical_macaddr.attr,
         &dev_attr_checksumming.attr,
+        &dev_attr_sniffer.attr,
         &dev_attr_large_send.attr,
         NULL,
 };