xfrm_state lock protects its state, i.e., VALID/DEAD and statistics,
not the transforming procedure, as both mode/type output functions
are reentrant.

Another issue is state lock can be used in BH context when state timer
alarmed, after transformation in pktgen, update state statistics acquiring
state lock should disabled BH context for a moment. Otherwise LOCKDEP
critisize this:

[   62.354339] pktgen: Packet Generator for packet performance testing. Version: 2.74
[   62.655444]
[   62.655448] =================================
[   62.655451] [ INFO: inconsistent lock state ]
[   62.655455] 3.13.0-rc2+ #70 Not tainted
[   62.655457] ---------------------------------
[   62.655459] inconsistent {IN-SOFTIRQ-W} -> {SOFTIRQ-ON-W} usage.
[   62.655463] kpktgend_0/2764 [HC0[0]:SC0[0]:HE1:SE1] takes:
[   62.655466]  (&(&x->lock)->rlock){+.?...}, at: [<ffffffffa00886f6>] pktgen_thread_worker+0x1796/0x1860 [pktgen]
[   62.655479] {IN-SOFTIRQ-W} state was registered at:
[   62.655484]   [<ffffffff8109a61d>] __lock_acquire+0x62d/0x1d70
[   62.655492]   [<ffffffff8109c3c7>] lock_acquire+0x97/0x130
[   62.655498]   [<ffffffff81774af6>] _raw_spin_lock+0x36/0x70
[   62.655505]   [<ffffffff816dc3a3>] xfrm_timer_handler+0x43/0x290
[   62.655511]   [<ffffffff81059437>] __tasklet_hrtimer_trampoline+0x17/0x40
[   62.655519]   [<ffffffff8105a1b7>] tasklet_hi_action+0xd7/0xf0
[   62.655523]   [<ffffffff81059ac6>] __do_softirq+0xe6/0x2d0
[   62.655526]   [<ffffffff8105a026>] irq_exit+0x96/0xc0
[   62.655530]   [<ffffffff8177fd0a>] smp_apic_timer_interrupt+0x4a/0x60
[   62.655537]   [<ffffffff8177e96f>] apic_timer_interrupt+0x6f/0x80
[   62.655541]   [<ffffffff8100b7c6>] arch_cpu_idle+0x26/0x30
[   62.655547]   [<ffffffff810ace28>] cpu_startup_entry+0x88/0x2b0
[   62.655552]   [<ffffffff81761c3c>] rest_init+0xbc/0xd0
[   62.655557]   [<ffffffff81ea5e5e>] start_kernel+0x3c4/0x3d1
[   62.655583]   [<ffffffff81ea55a8>] x86_64_start_reservations+0x2a/0x2c
[   62.655588]   [<ffffffff81ea569f>] x86_64_start_kernel+0xf5/0xfc
[   62.655592] irq event stamp: 77
[   62.655594] hardirqs last  enabled at (77): [<ffffffff810ab7f2>] vprintk_emit+0x1b2/0x520
[   62.655597] hardirqs last disabled at (76): [<ffffffff810ab684>] vprintk_emit+0x44/0x520
[   62.655601] softirqs last  enabled at (22): [<ffffffff81059b57>] __do_softirq+0x177/0x2d0
[   62.655605] softirqs last disabled at (15): [<ffffffff8105a026>] irq_exit+0x96/0xc0
[   62.655609]
[   62.655609] other info that might help us debug this:
[   62.655613]  Possible unsafe locking scenario:
[   62.655613]
[   62.655616]        CPU0
[   62.655617]        ----
[   62.655618]   lock(&(&x->lock)->rlock);
[   62.655622]   <Interrupt>
[   62.655623]     lock(&(&x->lock)->rlock);
[   62.655626]
[   62.655626]  *** DEADLOCK ***
[   62.655626]
[   62.655629] no locks held by kpktgend_0/2764.
[   62.655631]
[   62.655631] stack backtrace:
[   62.655636] CPU: 0 PID: 2764 Comm: kpktgend_0 Not tainted 3.13.0-rc2+ #70
[   62.655638] Hardware name: innotek GmbH VirtualBox, BIOS VirtualBox 12/01/2006
[   62.655642]  ffffffff8216b7b0 ffff88001be43ab8 ffffffff8176af37 0000000000000007
[   62.655652]  ffff88001c8d4fc0 ffff88001be43b18 ffffffff81766d78 0000000000000000
[   62.655663]  ffff880000000001 ffff880000000001 ffffffff8101025f ffff88001be43b18
[   62.655671] Call Trace:
[   62.655680]  [<ffffffff8176af37>] dump_stack+0x46/0x58
[   62.655685]  [<ffffffff81766d78>] print_usage_bug+0x1f1/0x202
[   62.655691]  [<ffffffff8101025f>] ? save_stack_trace+0x2f/0x50
[   62.655696]  [<ffffffff81099f8c>] mark_lock+0x28c/0x2f0
[   62.655700]  [<ffffffff810994b0>] ? check_usage_forwards+0x150/0x150
[   62.655704]  [<ffffffff8109a67a>] __lock_acquire+0x68a/0x1d70
[   62.655712]  [<ffffffff81115b09>] ? irq_work_queue+0x69/0xb0
[   62.655717]  [<ffffffff810ab7f2>] ? vprintk_emit+0x1b2/0x520
[   62.655722]  [<ffffffff8109cec5>] ? trace_hardirqs_on_caller+0x105/0x1d0
[   62.655730]  [<ffffffffa00886f6>] ? pktgen_thread_worker+0x1796/0x1860 [pktgen]
[   62.655734]  [<ffffffff8109c3c7>] lock_acquire+0x97/0x130
[   62.655741]  [<ffffffffa00886f6>] ? pktgen_thread_worker+0x1796/0x1860 [pktgen]
[   62.655745]  [<ffffffff81774af6>] _raw_spin_lock+0x36/0x70
[   62.655752]  [<ffffffffa00886f6>] ? pktgen_thread_worker+0x1796/0x1860 [pktgen]
[   62.655758]  [<ffffffffa00886f6>] pktgen_thread_worker+0x1796/0x1860 [pktgen]
[   62.655766]  [<ffffffffa0087a79>] ? pktgen_thread_worker+0xb19/0x1860 [pktgen]
[   62.655771]  [<ffffffff8109cf9d>] ? trace_hardirqs_on+0xd/0x10
[   62.655777]  [<ffffffff81775410>] ? _raw_spin_unlock_irq+0x30/0x40
[   62.655785]  [<ffffffff8151faa0>] ? e1000_clean+0x9d0/0x9d0
[   62.655791]  [<ffffffff81094310>] ? __init_waitqueue_head+0x60/0x60
[   62.655795]  [<ffffffff81094310>] ? __init_waitqueue_head+0x60/0x60
[   62.655800]  [<ffffffffa0086f60>] ? mod_cur_headers+0x7f0/0x7f0 [pktgen]
[   62.655806]  [<ffffffff81078f84>] kthread+0xe4/0x100
[   62.655813]  [<ffffffff81078ea0>] ? flush_kthread_worker+0x170/0x170
[   62.655819]  [<ffffffff8177dc6c>] ret_from_fork+0x7c/0xb0
[   62.655824]  [<ffffffff81078ea0>] ? flush_kthread_worker+0x170/0x170
Signed-off-by: NFan Du <fan.du@windriver.com>
Signed-off-by: NSteffen Klassert <steffen.klassert@secunet.com>

commit a553e4a6 ("[PKTGEN]: IPSEC support")
tried to support IPsec ESP transport transformation for pktgen, but acctually
this doesn't work at all for two reasons(The orignal transformed packet has
bad IPv4 checksum value, as well as wrong auth value, reported by wireshark)

- After transpormation, IPv4 header total length needs update,
  because encrypted payload's length is NOT same as that of plain text.

- After transformation, IPv4 checksum needs re-caculate because of payload
  has been changed.

With this patch, armmed pktgen with below cofiguration, Wireshark is able to
decrypted ESP packet generated by pktgen without any IPv4 checksum error or
auth value error.

pgset "flag IPSEC"
pgset "flows 1"
Signed-off-by: NFan Du <fan.du@windriver.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Fixes this on PowerPC (at least):

net/core/pktgen.c: In function 'fill_packet_ipv6':
net/core/pktgen.c:2906:3: error: implicit declaration of function 'csum_ipv6_magic' [-Werror=implicit-function-declaration]
   udph->check = ~csum_ipv6_magic(&iph->saddr, &iph->daddr, udplen, IPPROTO_UDP, 0);
   ^
Signed-off-by: NStephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Signed-off-by: NThomas Graf <tgraf@suug.ch>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

UDP checksums are optional, hence pktgen has been omitting them in
favour of performance. The optional flag UDPCSUM enables UDP
checksumming. If the output device supports hardware checksumming
the skb is prepared and marked CHECKSUM_PARTIAL, otherwise the
checksum is generated in software.
Signed-off-by: NThomas Graf <tgraf@suug.ch>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Ben Greear <greearb@candelatech.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

We currently allow for numa-node aware skb allocation only within the
fill_packet_ipv4() path, but not in fill_packet_ipv6(). Consolidate that
code to a common allocation helper to enable numa-node aware skb
allocation for ipv6, and use it in both paths. This also makes both
functions a bit more readable.
Signed-off-by: NDaniel Borkmann <dborkman@redhat.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

skb_set_network_header() expects an offset based on the data pointer
whereas skb_tail_offset() also includes the headroom. This resulted
in the ip header being written in a wrong location.

Use return values of skb_put() directly and rely on skb->len to
set mac, network, and transport header.

Cc: Simon Horman <horms@verge.net.au>
Cc: Daniel Borkmann <dborkmann@redhat.com>
Assisted-by: NDaniel Borkmann <dborkmann@redhat.com>
Signed-off-by: NThomas Graf <tgraf@suug.ch>
Acked-by: NDaniel Borkmann <dborkmann@redhat.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

This corrects an regression introduced by "net: Use 16bits for *_headers
fields of struct skbuff" when NET_SKBUFF_DATA_USES_OFFSET is not set. In
that case skb->tail will be a pointer however skb->network_header is now
an offset.

This patch corrects the problem by adding a wrapper to return skb tail as
an offset regardless of the value of NET_SKBUFF_DATA_USES_OFFSET. It seems
that skb->tail that this offset may be more than 64k and some care has been
taken to treat such cases as an error.
Signed-off-by: NSimon Horman <horms@verge.net.au>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

So far, only net_device * could be passed along with netdevice notifier
event. This patch provides a possibility to pass custom structure
able to provide info that event listener needs to know.
Signed-off-by: NJiri Pirko <jiri@resnulli.us>

v2->v3: fix typo on simeth
	shortened dev_getter
	shortened notifier_info struct name
v1->v2: fix notifier_call parameter in call_netdevice_notifier()
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Supply a function (proc_remove()) to remove a proc entry (and any subtree
rooted there) by proc_dir_entry pointer rather than by name and (optionally)
root dir entry pointer.  This allows us to eliminate all remaining pde->name
accesses outside of procfs.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
Acked-by: NGrant Likely <grant.likely@linaro.or>
cc: linux-acpi@vger.kernel.org
cc: openipmi-developer@lists.sourceforge.net
cc: devicetree-discuss@lists.ozlabs.org
cc: linux-pci@vger.kernel.org
cc: netdev@vger.kernel.org
cc: netfilter-devel@vger.kernel.org
cc: alsa-devel@alsa-project.org
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Remove duplicate statements by using do-while loop instead of while loop.

- A;
- while (e) {
+ do {
	A;
- }
+ } while (e);
Signed-off-by: NAkinobu Mita <akinobu.mita@gmail.com>
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Use preferable function name which implies using a pseudo-random
number generator.
Signed-off-by: NAkinobu Mita <akinobu.mita@gmail.com>
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

The only part of proc_dir_entry the code outside of fs/proc
really cares about is PDE(inode)->data.  Provide a helper
for that; static inline for now, eventually will be moved
to fs/proc, along with the knowledge of struct proc_dir_entry
layout.
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

proc_net_remove is only used to remove proc entries
that under /proc/net,it's not a general function for
removing proc entries of netns. if we want to remove
some proc entries which under /proc/net/stat/, we still
need to call remove_proc_entry.

this patch use remove_proc_entry to replace proc_net_remove.
we can remove proc_net_remove after this patch.
Signed-off-by: NGao feng <gaofeng@cn.fujitsu.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

The return value of pktgen_add_device() is not checked, so
even if we fail to add some device, for example, non-exist one,
we still see "OK:...". This patch fixes it.

After this patch, I got:

	# echo "add_device non-exist" > /proc/net/pktgen/kpktgend_0
	-bash: echo: write error: No such device
	# cat /proc/net/pktgen/kpktgend_0
	Running:
	Stopped:
	Result: ERROR: can not add device non-exist
	# echo "add_device eth0" > /proc/net/pktgen/kpktgend_0
	# cat /proc/net/pktgen/kpktgend_0
	Running:
	Stopped: eth0
	Result: OK: add_device=eth0

(Candidate for -stable)

Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: NCong Wang <amwang@redhat.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

v3: make pktgen_threads list per-namespace
v2: remove a useless check

This patch add net namespace to pktgen, so that
we can use pktgen in different namespaces.

Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: NCong Wang <amwang@redhat.com>
Acked-by: N"Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Some years ago, the ktime_t helper functions ktime_now() and ktime_lt()
have been introduced. Instead of defining them inside pktgen.c, they
should either use ktime_t library functions or, if not available, they
should be defined in ktime.h, so that also others can benefit from them.
ktime_compare() is introduced with a similar notion as in timespec_compare().
Signed-off-by: NDaniel Borkmann <daniel.borkmann@tik.ee.ethz.ch>
Cc: Cong Wang <xiyou.wangcong@gmail.com>
Cc: Stephen Hemminger <shemminger@vyatta.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Acked-by: NThomas Gleixner <tglx@linutronix.de>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Use the standard test for a non-zero ipv6 address.
Signed-off-by: NJoe Perches <joe@perches.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: NCong Wang <amwang@redhat.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: NCong Wang <amwang@redhat.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

It is weird to display IPv4 address in %x format, what's more,
IPv6 address is disaplayed in human-readable format too. So,
make it human-readable.

Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: NCong Wang <amwang@redhat.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

ETH_ZLEN is too small for IPv6, so this default value is not
suitable.

Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: NCong Wang <amwang@redhat.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

For IPv6, sizeof(struct ipv6hdr) = 40, thus the following
expression will result negative:

        datalen = pkt_dev->cur_pkt_size - 14 -
                  sizeof(struct ipv6hdr) - sizeof(struct udphdr) -
                  pkt_dev->pkt_overhead;

And,  the check "if (datalen < sizeof(struct pktgen_hdr))" will be
passed as "datalen" is promoted to unsigned, therefore will cause
a crash later.

This is a quick fix by checking if "datalen" is negative. The following
patch will increase the default value of 'min_pkt_size' for IPv6.

This bug should exist for a long time, so Cc -stable too.

Cc: <stable@vger.kernel.org>
Cc: David S. Miller <davem@davemloft.net>
Signed-off-by: NCong Wang <amwang@redhat.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

If vlan option is being specified in the pktgen and packet size
being requested is less than 46 bytes, despite being illogical
request, pktgen should not crash the kernel.

BUG: unable to handle kernel paging request at ffff88021fb82000
Process kpktgend_0 (pid: 1184, threadinfo ffff880215f1a000, task ffff880218544530)
Call Trace:
[<ffffffffa0637cd2>] ? pktgen_finalize_skb+0x222/0x300 [pktgen]
[<ffffffff814f0084>] ? build_skb+0x34/0x1c0
[<ffffffffa0639b11>] pktgen_thread_worker+0x5d1/0x1790 [pktgen]
[<ffffffffa03ffb10>] ? igb_xmit_frame_ring+0xa30/0xa30 [igb]
[<ffffffff8107ba20>] ? wake_up_bit+0x40/0x40
[<ffffffff8107ba20>] ? wake_up_bit+0x40/0x40
[<ffffffffa0639540>] ? spin+0x240/0x240 [pktgen]
[<ffffffff8107b4e3>] kthread+0x93/0xa0
[<ffffffff81615de4>] kernel_thread_helper+0x4/0x10
[<ffffffff8107b450>] ? flush_kthread_worker+0x80/0x80
[<ffffffff81615de0>] ? gs_change+0x13/0x13

The root cause of why pktgen is not able to handle this case is due
to comparison of signed (datalen) and unsigned data (sizeof), which
eventually passes a huge number to skb_put().
Signed-off-by: NNishank Trivedi <nistrive@cisco.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

commit c57b5468 (pktgen: fix crash at module unload) did a very poor
job with list primitives.

1) list_splice() arguments were in the wrong order

2) list_splice(list, head) has undefined behavior if head is not
initialized.

3) We should use the list_splice_init() variant to clear pktgen_threads
list.
Signed-off-by: NEric Dumazet <edumazet@google.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Convert printk(KERN_DEBUG to pr_debug which can
enable dynamic debugging.

Remove embedded prefixes from the conversions as
pr_fmt adds them.

Align arguments.
Signed-off-by: NJoe Perches <joe@perches.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Standardize the net core ratelimited logging functions.

Coalesce formats, align arguments.
Change a printk then vprintk sequence to use printf extension %pV.
Signed-off-by: NJoe Perches <joe@perches.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

commit 7d3d43da (net: In unregister_netdevice_notifier unregister
the netdevices.) makes pktgen crashing at module unload.

[  296.820578] BUG: spinlock bad magic on CPU#6, rmmod/3267
[  296.820719]  lock: ffff880310c38000, .magic: ffff8803, .owner: <none>/-1, .owner_cpu: -1
[  296.820943] Pid: 3267, comm: rmmod Not tainted 3.4.0-rc5+ #254
[  296.821079] Call Trace:
[  296.821211]  [<ffffffff8168a715>] spin_dump+0x8a/0x8f
[  296.821345]  [<ffffffff8168a73b>] spin_bug+0x21/0x26
[  296.821507]  [<ffffffff812b4741>] do_raw_spin_lock+0x131/0x140
[  296.821648]  [<ffffffff8169188e>] _raw_spin_lock+0x1e/0x20
[  296.821786]  [<ffffffffa00cc0fd>] __pktgen_NN_threads+0x4d/0x140 [pktgen]
[  296.821928]  [<ffffffffa00ccf8d>] pktgen_device_event+0x10d/0x1e0 [pktgen]
[  296.822073]  [<ffffffff8154ed4f>] unregister_netdevice_notifier+0x7f/0x100
[  296.822216]  [<ffffffffa00d2a0b>] pg_cleanup+0x48/0x73 [pktgen]
[  296.822357]  [<ffffffff8109528e>] sys_delete_module+0x17e/0x2a0
[  296.822502]  [<ffffffff81699652>] system_call_fastpath+0x16/0x1b

Hold the pktgen_thread_lock while splicing pktgen_threads, and test
pktgen_exiting in pktgen_device_event() to make unload faster.
Signed-off-by: NEric Dumazet <edumazet@google.com>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Use of "unsigned int" is preferred to bare "unsigned" in net tree.
Signed-off-by: NEric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Every call to num_args() immediately checks the return value for
less than zero, as it will return -EFAULT for a failed get_user()
call.  So it makes no sense for the function to be declared as an
unsigned long.
Signed-off-by: NPaul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

In 88271660 "pktgen: fix multiple queue warning" we added special
logic to handle the case where ntxq is zero.  It's not clear to me that
ntxq can actually be zero.  But if it were then we would set
->queue_map_min and ->queue_map_max to USHRT_MAX when probably we want
to set them to zero?
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Create separate queue state flags so that either the stack or drivers
can turn on XOFF.  Added a set of functions used in the stack to determine
if a queue is really stopped (either by stack or driver)
Signed-off-by: NTom Herbert <therbert@google.com>
Acked-by: NEric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

C assignment can handle struct in6_addr copying.
Signed-off-by: NAlexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Daniel Turull reported inaccuracies in pktgen when using low packet
rates, because we call ndelay(val) with values bigger than 20000.

Instead of calling ndelay() for delays < 100us, we can instead loop
calling ktime_now() only.
Reported-by: NDaniel Turull <daniel.turull@gmail.com>
Signed-off-by: NEric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

I audited all of the callers in the tree and only one of them (pktgen) expects
it to do so. Taking this reference is pretty obviously confusing and error
prone.

In particular I looked at the following commits which switched callers of
(__)skb_frag_set_page to the skb paged fragment api:

6a930b9f cxgb3: convert to SKB paged frag API.
5dc3e196 myri10ge: convert to SKB paged frag API.
0e0634d2 vmxnet3: convert to SKB paged frag API.
86ee8130 virtionet: convert to SKB paged frag API.
4a22c4c9 sfc: convert to SKB paged frag API.
18324d69 cassini: convert to SKB paged frag API.
b061b39e benet: convert to SKB paged frag API.
b7b6a688 bnx2: convert to SKB paged frag API.
804cf14e net: xfrm: convert to SKB frag APIs
ea2ab693 net: convert core to skb paged frag APIs
Signed-off-by: NIan Campbell <ian.campbell@citrix.com>
Acked-by: NEric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

To ease skb->truesize sanitization, its better to be able to localize
all references to skb frags size.

Define accessors : skb_frag_size() to fetch frag size, and
skb_frag_size_{set|add|sub}() to manipulate it.
Signed-off-by: NEric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Signed-off-by: NIan Campbell <ian.campbell@citrix.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Eric Dumazet <eric.dumazet@gmail.com>
Cc: "Michał Mirosław" <mirq-linux@rere.qmqm.pl>
Cc: netdev@vger.kernel.org
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Pktgen attempts to transmit shared skbs to net devices, which can't be used by
some drivers as they keep state information in skbs.  This patch adds a flag
marking drivers as being able to handle shared skbs in their tx path.  Drivers
are defaulted to being unable to do so, but calling ether_setup enables this
flag, as 90% of the drivers calling ether_setup touch real hardware and can
handle shared skbs.  A subsequent patch will audit drivers to ensure that the
flag is set properly
Signed-off-by: NNeil Horman <nhorman@tuxdriver.com>
Reported-by: NJiri Pirko <jpirko@redhat.com>
CC: Robert Olsson <robert.olsson@its.uu.se>
CC: Eric Dumazet <eric.dumazet@gmail.com>
CC: Alexey Dobriyan <adobriyan@gmail.com>
CC: David S. Miller <davem@davemloft.net>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

This also shrinks the object size a little.

   text	   data	    bss	    dec	    hex	filename
  28834	    186	      8	  29028	   7164	net/core/pktgen.o
  28816	    186	      8	  29010	   7152	net/core/pktgen.o.AFTER
Signed-off-by: NWANG Cong <xiyou.wangcong@gmail.com>
Cc: "David Miller" <davem@davemloft.net>,
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Signed-off-by: NWANG Cong <xiyou.wangcong@gmail.com>
Cc: "David S. Miller" <davem@davemloft.net>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>