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qeth: rework TSO functions

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The maximum TSO size OSA can handle is 15 * PAGE_SIZE. This
patch reduces gso_max_size to this value and adds some sanity
checks and statistics to the TSO implementation.
Since only layer 3 is able to do TSO move all TSO related functions
to the qeth_l3 module.

Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Frank Blaschka
2009-11-12 00:11:44 +00:00
committed by David S. Miller
parent aa90922479
commit c3b4a740db
7 changed files with 110 additions and 98 deletions
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48
drivers/s390/net/qeth_l3_sys.c
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@ -318,6 +318,53 @@ 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_large_send_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct qeth_card *card = dev_get_drvdata(dev);
if (!card)
return -EINVAL;
switch (card->options.large_send) {
case QETH_LARGE_SEND_NO:
return sprintf(buf, "%s\n", "no");
case QETH_LARGE_SEND_TSO:
return sprintf(buf, "%s\n", "TSO");
default:
return sprintf(buf, "%s\n", "N/A");
}
}
static ssize_t qeth_l3_dev_large_send_store(struct device *dev,
struct device_attribute *attr, const char *buf, size_t count)
{
struct qeth_card *card = dev_get_drvdata(dev);
enum qeth_large_send_types type;
int rc = 0;
char *tmp;
if (!card)
return -EINVAL;
tmp = strsep((char **) &buf, "\n");
if (!strcmp(tmp, "no"))
type = QETH_LARGE_SEND_NO;
else if (!strcmp(tmp, "TSO"))
type = QETH_LARGE_SEND_TSO;
else
return -EINVAL;
if (card->options.large_send == type)
return count;
rc = qeth_l3_set_large_send(card, type);
if (rc)
return rc;
return count;
}
static DEVICE_ATTR(large_send, 0644, qeth_l3_dev_large_send_show,
qeth_l3_dev_large_send_store);
static struct attribute *qeth_l3_device_attrs[] = {
&dev_attr_route4.attr,
&dev_attr_route6.attr,
@ -325,6 +372,7 @@ static struct attribute *qeth_l3_device_attrs[] = {
&dev_attr_broadcast_mode.attr,
&dev_attr_canonical_macaddr.attr,
&dev_attr_checksumming.attr,
&dev_attr_large_send.attr,
NULL,
};