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net: make struct net_device::tx_queue_len unsigned int

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4 billion packet queue is something unthinkable so use 32-bit value
for now.

Space savings on x86_64:

	add/remove: 0/0 grow/shrink: 3/70 up/down: 16/-131 (-115)
	function                                     old     new   delta
	change_tx_queue_len                           94     108     +14
	qdisc_create                                1176    1177      +1
	alloc_netdev_mqs                            1124    1125      +1
	xenvif_alloc                                 533     532      -1
	x25_asy_setup                                167     166      -1
			...
	tun_queue_resize                             945     940      -5
	pfifo_fast_enqueue                           167     162      -5
	qfq_init_qdisc                               168     158     -10
	tap_queue_resize                             810     799     -11
	transmit                                     719     698     -21

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexey Dobriyan 2017-05-17 13:30:44 +03:00 committed by David S. Miller
parent 64f5102dcb
commit 0cd2950357
4 changed files with 11 additions and 6 deletions
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3
drivers/net/wan/hdlc_raw_eth.c
View File

@ -57,7 +57,8 @@ static int raw_eth_ioctl(struct net_device *dev, struct ifreq *ifr)
const size_t size = sizeof(raw_hdlc_proto);
raw_hdlc_proto new_settings;
hdlc_device *hdlc = dev_to_hdlc(dev);
int result, old_qlen;
unsigned int old_qlen;
int result;
switch (ifr->ifr_settings.type) {
case IF_GET_PROTO:

2
include/linux/netdevice.h
View File

@ -1824,7 +1824,7 @@ struct net_device {
#ifdef CONFIG_NET_SCHED
DECLARE_HASHTABLE (qdisc_hash, 4);
#endif
unsigned long tx_queue_len;
unsigned int tx_queue_len;
spinlock_t tx_global_lock;
int watchdog_timeo;

8
net/core/net-sysfs.c
View File

@ -323,7 +323,11 @@ NETDEVICE_SHOW_RW(flags, fmt_hex);
static int change_tx_queue_len(struct net_device *dev, unsigned long new_len)
{
int res, orig_len = dev->tx_queue_len;
unsigned int orig_len = dev->tx_queue_len;
int res;
if (new_len != (unsigned int)new_len)
return -ERANGE;
if (new_len != orig_len) {
dev->tx_queue_len = new_len;
@ -349,7 +353,7 @@ static ssize_t tx_queue_len_store(struct device *dev,
return netdev_store(dev, attr, buf, len, change_tx_queue_len);
}
NETDEVICE_SHOW_RW(tx_queue_len, fmt_ulong);
NETDEVICE_SHOW_RW(tx_queue_len, fmt_dec);
static int change_gro_flush_timeout(struct net_device *dev, unsigned long val)
{

4
net/core/rtnetlink.c
View File

@ -2046,8 +2046,8 @@ static int do_setlink(const struct sk_buff *skb,
}
if (tb[IFLA_TXQLEN]) {
unsigned long value = nla_get_u32(tb[IFLA_TXQLEN]);
unsigned long orig_len = dev->tx_queue_len;
unsigned int value = nla_get_u32(tb[IFLA_TXQLEN]);
unsigned int orig_len = dev->tx_queue_len;
if (dev->tx_queue_len ^ value) {
dev->tx_queue_len = value;