iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
8a4eb5734e
linux/net/core/timestamping.c

129 lines
2.9 KiB
C
Raw Normal View History

net: support time stamping in phy devices. This patch adds a new networking option to allow hardware time stamps from PHY devices. When enabled, likely candidates among incoming and outgoing network packets are offered to the PHY driver for possible time stamping. When accepted by the PHY driver, incoming packets are deferred for later delivery by the driver. The patch also adds phylib driver methods for the SIOCSHWTSTAMP ioctl and callbacks for transmit and receive time stamping. Drivers may optionally implement these functions. Signed-off-by: Richard Cochran <richard.cochran@omicron.at> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-07-17 12:49:36 +04:00
/*
* PTP 1588 clock support - support for timestamping in PHY devices
*
* Copyright (C) 2010 OMICRON electronics GmbH
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/errqueue.h>
#include <linux/phy.h>
#include <linux/ptp_classify.h>
#include <linux/skbuff.h>
static struct sock_filter ptp_filter[] = {
PTP_FILTER
};
filter: constify sk_run_filter() sk_run_filter() doesnt write on skb, change its prototype to reflect this. Fix two af_packet comments. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-12-06 23:50:09 +03:00
static unsigned int classify(const struct sk_buff *skb)
net: support time stamping in phy devices. This patch adds a new networking option to allow hardware time stamps from PHY devices. When enabled, likely candidates among incoming and outgoing network packets are offered to the PHY driver for possible time stamping. When accepted by the PHY driver, incoming packets are deferred for later delivery by the driver. The patch also adds phylib driver methods for the SIOCSHWTSTAMP ioctl and callbacks for transmit and receive time stamping. Drivers may optionally implement these functions. Signed-off-by: Richard Cochran <richard.cochran@omicron.at> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-07-17 12:49:36 +04:00
{
if (likely(skb->dev &&
skb->dev->phydev &&
skb->dev->phydev->drv))
filter: optimize sk_run_filter Remove pc variable to avoid arithmetic to compute fentry at each filter instruction. Jumps directly manipulate fentry pointer. As the last instruction of filter[] is guaranteed to be a RETURN, and all jumps are before the last instruction, we dont need to check filter bounds (number of instructions in filter array) at each iteration, so we remove it from sk_run_filter() params. On x86_32 remove f_k var introduced in commit 57fe93b374a6b871 (filter: make sure filters dont read uninitialized memory) Note : We could use a CONFIG_ARCH_HAS_{FEW|MANY}_REGISTERS in order to avoid too many ifdefs in this code. This helps compiler to use cpu registers to hold fentry and A accumulator. On x86_32, this saves 401 bytes, and more important, sk_run_filter() runs much faster because less register pressure (One less conditional branch per BPF instruction) # size net/core/filter.o net/core/filter_pre.o text data bss dec hex filename 2948 0 0 2948 b84 net/core/filter.o 3349 0 0 3349 d15 net/core/filter_pre.o on x86_64 : # size net/core/filter.o net/core/filter_pre.o text data bss dec hex filename 5173 0 0 5173 1435 net/core/filter.o 5224 0 0 5224 1468 net/core/filter_pre.o Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Acked-by: Changli Gao <xiaosuo@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-11-19 20:49:59 +03:00
return sk_run_filter(skb, ptp_filter);
net: support time stamping in phy devices. This patch adds a new networking option to allow hardware time stamps from PHY devices. When enabled, likely candidates among incoming and outgoing network packets are offered to the PHY driver for possible time stamping. When accepted by the PHY driver, incoming packets are deferred for later delivery by the driver. The patch also adds phylib driver methods for the SIOCSHWTSTAMP ioctl and callbacks for transmit and receive time stamping. Drivers may optionally implement these functions. Signed-off-by: Richard Cochran <richard.cochran@omicron.at> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-07-17 12:49:36 +04:00
else
return PTP_CLASS_NONE;
}
void skb_clone_tx_timestamp(struct sk_buff *skb)
{
struct phy_device *phydev;
struct sk_buff *clone;
struct sock *sk = skb->sk;
unsigned int type;
if (!sk)
return;
type = classify(skb);
switch (type) {
case PTP_CLASS_V1_IPV4:
case PTP_CLASS_V1_IPV6:
case PTP_CLASS_V2_IPV4:
case PTP_CLASS_V2_IPV6:
case PTP_CLASS_V2_L2:
case PTP_CLASS_V2_VLAN:
phydev = skb->dev->phydev;
if (likely(phydev->drv->txtstamp)) {
clone = skb_clone(skb, GFP_ATOMIC);
if (!clone)
return;
clone->sk = sk;
phydev->drv->txtstamp(phydev, clone, type);
}
break;
default:
break;
}
}
void skb_complete_tx_timestamp(struct sk_buff *skb,
struct skb_shared_hwtstamps *hwtstamps)
{
struct sock *sk = skb->sk;
struct sock_exterr_skb *serr;
int err;
if (!hwtstamps)
return;
*skb_hwtstamps(skb) = *hwtstamps;
serr = SKB_EXT_ERR(skb);
memset(serr, 0, sizeof(*serr));
serr->ee.ee_errno = ENOMSG;
serr->ee.ee_origin = SO_EE_ORIGIN_TIMESTAMPING;
skb->sk = NULL;
err = sock_queue_err_skb(sk, skb);
if (err)
kfree_skb(skb);
}
EXPORT_SYMBOL_GPL(skb_complete_tx_timestamp);
bool skb_defer_rx_timestamp(struct sk_buff *skb)
{
struct phy_device *phydev;
unsigned int type;
net: fix skb_defer_rx_timestamp() After commit c1f19b51d1d8 (net: support time stamping in phy devices.), kernel might crash if CONFIG_NETWORK_PHY_TIMESTAMPING=y and skb_defer_rx_timestamp() handles a packet without an ethernet header. Fixes kernel bugzilla #24102 Reference: https://bugzilla.kernel.org/show_bug.cgi?id=24102 Reported-and-tested-by: Andrew Watts <akwatts@ymail.com> Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-12-05 21:50:32 +03:00
if (skb_headroom(skb) < ETH_HLEN)
return false;
__skb_push(skb, ETH_HLEN);
net: support time stamping in phy devices. This patch adds a new networking option to allow hardware time stamps from PHY devices. When enabled, likely candidates among incoming and outgoing network packets are offered to the PHY driver for possible time stamping. When accepted by the PHY driver, incoming packets are deferred for later delivery by the driver. The patch also adds phylib driver methods for the SIOCSHWTSTAMP ioctl and callbacks for transmit and receive time stamping. Drivers may optionally implement these functions. Signed-off-by: Richard Cochran <richard.cochran@omicron.at> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-07-17 12:49:36 +04:00
type = classify(skb);
net: fix skb_defer_rx_timestamp() After commit c1f19b51d1d8 (net: support time stamping in phy devices.), kernel might crash if CONFIG_NETWORK_PHY_TIMESTAMPING=y and skb_defer_rx_timestamp() handles a packet without an ethernet header. Fixes kernel bugzilla #24102 Reference: https://bugzilla.kernel.org/show_bug.cgi?id=24102 Reported-and-tested-by: Andrew Watts <akwatts@ymail.com> Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-12-05 21:50:32 +03:00
__skb_pull(skb, ETH_HLEN);
net: support time stamping in phy devices. This patch adds a new networking option to allow hardware time stamps from PHY devices. When enabled, likely candidates among incoming and outgoing network packets are offered to the PHY driver for possible time stamping. When accepted by the PHY driver, incoming packets are deferred for later delivery by the driver. The patch also adds phylib driver methods for the SIOCSHWTSTAMP ioctl and callbacks for transmit and receive time stamping. Drivers may optionally implement these functions. Signed-off-by: Richard Cochran <richard.cochran@omicron.at> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-07-17 12:49:36 +04:00
switch (type) {
case PTP_CLASS_V1_IPV4:
case PTP_CLASS_V1_IPV6:
case PTP_CLASS_V2_IPV4:
case PTP_CLASS_V2_IPV6:
case PTP_CLASS_V2_L2:
case PTP_CLASS_V2_VLAN:
phydev = skb->dev->phydev;
if (likely(phydev->drv->rxtstamp))
return phydev->drv->rxtstamp(phydev, skb, type);
break;
default:
break;
}
return false;
}
void __init skb_timestamping_init(void)
{
BUG_ON(sk_chk_filter(ptp_filter, ARRAY_SIZE(ptp_filter)));
}
Reference in New Issue Copy Permalink