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2011-12-20af_iucv: release reference to HS deviceUrsula Braun1-13/+24
For HiperSockets transport skbs sent are bound to one of the available HiperSockets devices. Add missing release of reference to a HiperSockets device before freeing an skb. 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>
2011-12-20af_iucv: accelerate close for HS transportUrsula Braun1-0/+7
Closing an af_iucv socket may wait for confirmation of outstanding send requests. This patch adds confirmation code for the new HiperSockets transport. 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>
2011-12-20af_iucv: support ancillary data with HS transportUrsula Braun1-0/+2
The AF_IUCV address family offers support for ancillary data. This patch enables usage of ancillary data with the new HiperSockets transport. 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>
2011-10-13net: more accurate skb truesizeEric Dumazet1-1/+1
skb truesize currently accounts for sk_buff struct and part of skb head. kmalloc() roundings are also ignored. Considering that skb_shared_info is larger than sk_buff, its time to take it into account for better memory accounting. This patch introduces SKB_TRUESIZE(X) macro to centralize various assumptions into a single place. At skb alloc phase, we put skb_shared_info struct at the exact end of skb head, to allow a better use of memory (lowering number of reallocations), since kmalloc() gives us power-of-two memory blocks. Unless SLUB/SLUB debug is active, both skb->head and skb_shared_info are aligned to cache lines, as before. Note: This patch might trigger performance regressions because of misconfigured protocol stacks, hitting per socket or global memory limits that were previously not reached. But its a necessary step for a more accurate memory accounting. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> CC: Andi Kleen <ak@linux.intel.com> CC: Ben Hutchings <bhutchings@solarflare.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-08-13af_iucv: add HiperSockets transportUrsula Braun1-72/+677
The current transport mechanism for af_iucv is the z/VM offered communications facility IUCV. To provide equivalent support when running Linux in an LPAR, HiperSockets transport is added to the AF_IUCV address family. It requires explicit binding of an AF_IUCV socket to a HiperSockets device. A new packet_type ETH_P_AF_IUCV is announced. An af_iucv specific transport header is defined preceding the skb data. A small protocol is implemented for connecting and for flow control/congestion management. Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com> Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com> Reviewed-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-08-13af_iucv: cleanup - use iucv_sk(sk) earlyUrsula Braun1-21/+23
Code cleanup making make use of local variable for struct iucv_sock. 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>
2011-08-13af_iucv: use loadable iucv interfaceFrank Blaschka1-45/+74
For future af_iucv extensions the module should be able to run in LPAR mode too. For this we use the new dynamic loading iucv interface. Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2011-05-13af_iucv: get rid of compile warningUrsula Braun1-7/+2
-Wunused-but-set-variable generates compile warnings. The affected variables are removed. 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>
2011-03-31Fix common misspellingsLucas De Marchi1-1/+1
Fixes generated by 'codespell' and manually reviewed. Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
2010-05-26net/iucv: Add missing spin_unlockJulia Lawall1-1/+1
Add a spin_unlock missing on the error path. There seems like no reason why the lock should continue to be held if the kzalloc fail. The semantic match that finds this problem is as follows: (http://coccinelle.lip6.fr/) // <smpl> @@ expression E1; @@ * spin_lock(E1,...); <+... when != E1 if (...) { ... when != E1 * return ...; } ...+> * spin_unlock(E1,...); // </smpl> Signed-off-by: Julia Lawall <julia@diku.dk> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-05-17net: Remove unnecessary returns from void function()sJoe Perches1-1/+0
This patch removes from net/ (but not any netfilter files) all the unnecessary return; statements that precede the last closing brace of void functions. It does not remove the returns that are immediately preceded by a label as gcc doesn't like that. Done via: $ grep -rP --include=*.[ch] -l "return;\n}" net/ | \ xargs perl -i -e 'local $/ ; while (<>) { s/\n[ \t\n]+return;\n}/\n}/g; print; }' Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-05-01net: sock_def_readable() and friends RCU conversionEric Dumazet1-4/+7
sk_callback_lock rwlock actually protects sk->sk_sleep pointer, so we need two atomic operations (and associated dirtying) per incoming packet. RCU conversion is pretty much needed : 1) Add a new structure, called "struct socket_wq" to hold all fields that will need rcu_read_lock() protection (currently: a wait_queue_head_t and a struct fasync_struct pointer). [Future patch will add a list anchor for wakeup coalescing] 2) Attach one of such structure to each "struct socket" created in sock_alloc_inode(). 3) Respect RCU grace period when freeing a "struct socket_wq" 4) Change sk_sleep pointer in "struct sock" by sk_wq, pointer to "struct socket_wq" 5) Change sk_sleep() function to use new sk->sk_wq instead of sk->sk_sleep 6) Change sk_has_sleeper() to wq_has_sleeper() that must be used inside a rcu_read_lock() section. 7) Change all sk_has_sleeper() callers to : - Use rcu_read_lock() instead of read_lock(&sk->sk_callback_lock) - Use wq_has_sleeper() to eventually wakeup tasks. - Use rcu_read_unlock() instead of read_unlock(&sk->sk_callback_lock) 8) sock_wake_async() is modified to use rcu protection as well. 9) Exceptions : macvtap, drivers/net/tun.c, af_unix use integrated "struct socket_wq" instead of dynamically allocated ones. They dont need rcu freeing. Some cleanups or followups are probably needed, (possible sk_callback_lock conversion to a spinlock for example...). Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2010-04-20net: sk_sleep() helperEric Dumazet1-6/+6
Define a new function to return the waitqueue of a "struct sock". static inline wait_queue_head_t *sk_sleep(struct sock *sk) { return sk->sk_sleep; } Change all read occurrences of sk_sleep by a call to this function. Needed for a future RCU conversion. sk_sleep wont be a field directly available. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-12-15const: constify remaining dev_pm_opsAlexey Dobriyan1-1/+1
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-11-05net: pass kern to net_proto_family create functionEric Paris1-1/+2
The generic __sock_create function has a kern argument which allows the security system to make decisions based on if a socket is being created by the kernel or by userspace. This patch passes that flag to the net_proto_family specific create function, so it can do the same thing. Signed-off-by: Eric Paris <eparis@redhat.com> Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-10-17af_iucv: remove duplicate sock_set_flagUrsula Braun1-1/+0
Remove duplicate sock_set_flag(sk, SOCK_ZAPPED) in iucv_sock_close, which has been overlooked in September-commit 7514bab04e567c9408fe0facbde4277f09d5eb74. Cc: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-10-17af_iucv: use sk functions to modify sk->sk_ack_backlogHendrik Brueckner1-2/+2
Instead of modifying sk->sk_ack_backlog directly, use respective socket functions. Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-10-07net: mark net_proto_ops as constStephen Hemminger1-1/+1
All usages of structure net_proto_ops should be declared const. Signed-off-by: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-09-30net: Make setsockopt() optlen be unsigned.David S. Miller1-1/+1
This provides safety against negative optlen at the type level instead of depending upon (sometimes non-trivial) checks against this sprinkled all over the the place, in each and every implementation. Based upon work done by Arjan van de Ven and feedback from Linus Torvalds. Signed-off-by: David S. Miller <davem@davemloft.net>
2009-09-16af_iucv: fix race when queueing skbs on the backlog queueHendrik Brueckner1-2/+14
iucv_sock_recvmsg() and iucv_process_message()/iucv_fragment_skb race for dequeuing an skb from the backlog queue. If iucv_sock_recvmsg() dequeues first, iucv_process_message() calls sock_queue_rcv_skb() with an skb that is NULL. This results in the following kernel panic: <1>Unable to handle kernel pointer dereference at virtual kernel address (null) <4>Oops: 0004 [#1] PREEMPT SMP DEBUG_PAGEALLOC <4>Modules linked in: af_iucv sunrpc qeth_l3 dm_multipath dm_mod vmur qeth ccwgroup <4>CPU: 0 Not tainted 2.6.30 #4 <4>Process client-iucv (pid: 4787, task: 0000000034e75940, ksp: 00000000353e3710) <4>Krnl PSW : 0704000180000000 000000000043ebca (sock_queue_rcv_skb+0x7a/0x138) <4> R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:0 CC:0 PM:0 EA:3 <4>Krnl GPRS: 0052900000000000 000003e0016e0fe8 0000000000000000 0000000000000000 <4> 000000000043eba8 0000000000000002 0000000000000001 00000000341aa7f0 <4> 0000000000000000 0000000000007800 0000000000000000 0000000000000000 <4> 00000000341aa7f0 0000000000594650 000000000043eba8 000000003fc2fb28 <4>Krnl Code: 000000000043ebbe: a7840006 brc 8,43ebca <4> 000000000043ebc2: 5930c23c c %r3,572(%r12) <4> 000000000043ebc6: a724004c brc 2,43ec5e <4> >000000000043ebca: e3c0b0100024 stg %r12,16(%r11) <4> 000000000043ebd0: a7190000 lghi %r1,0 <4> 000000000043ebd4: e310b0200024 stg %r1,32(%r11) <4> 000000000043ebda: c010ffffdce9 larl %r1,43a5ac <4> 000000000043ebe0: e310b0800024 stg %r1,128(%r11) <4>Call Trace: <4>([<000000000043eba8>] sock_queue_rcv_skb+0x58/0x138) <4> [<000003e0016bcf2a>] iucv_process_message+0x112/0x3cc [af_iucv] <4> [<000003e0016bd3d4>] iucv_callback_rx+0x1f0/0x274 [af_iucv] <4> [<000000000053a21a>] iucv_message_pending+0xa2/0x120 <4> [<000000000053b5a6>] iucv_tasklet_fn+0x176/0x1b8 <4> [<000000000014fa82>] tasklet_action+0xfe/0x1f4 <4> [<0000000000150a56>] __do_softirq+0x116/0x284 <4> [<0000000000111058>] do_softirq+0xe4/0xe8 <4> [<00000000001504ba>] irq_exit+0xba/0xd8 <4> [<000000000010e0b2>] do_extint+0x146/0x190 <4> [<00000000001184b6>] ext_no_vtime+0x1e/0x22 <4> [<00000000001fbf4e>] kfree+0x202/0x28c <4>([<00000000001fbf44>] kfree+0x1f8/0x28c) <4> [<000000000044205a>] __kfree_skb+0x32/0x124 <4> [<000003e0016bd8b2>] iucv_sock_recvmsg+0x236/0x41c [af_iucv] <4> [<0000000000437042>] sock_aio_read+0x136/0x160 <4> [<0000000000205e50>] do_sync_read+0xe4/0x13c <4> [<0000000000206dce>] vfs_read+0x152/0x15c <4> [<0000000000206ed0>] SyS_read+0x54/0xac <4> [<0000000000117c8e>] sysc_noemu+0x10/0x16 <4> [<00000042ff8def3c>] 0x42ff8def3c Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-09-16af_iucv: do not call iucv_sock_kill() twiceHendrik Brueckner1-5/+5
For non-accepted sockets on the accept queue, iucv_sock_kill() is called twice (in iucv_sock_close() and iucv_sock_cleanup_listen()). This typically results in a kernel oops as shown below. Remove the duplicate call to iucv_sock_kill() and set the SOCK_ZAPPED flag in iucv_sock_close() only. The iucv_sock_kill() function frees a socket only if the socket is zapped and orphaned (sk->sk_socket == NULL): - Non-accepted sockets are always orphaned and, thus, iucv_sock_kill() frees the socket twice. - For accepted sockets or sockets created with iucv_sock_create(), sk->sk_socket is initialized. This caused the first call to iucv_sock_kill() to return immediately. To free these sockets, iucv_sock_release() uses sock_orphan() before calling iucv_sock_kill(). <1>Unable to handle kernel pointer dereference at virtual kernel address 000000003edd3000 <4>Oops: 0011 [#1] PREEMPT SMP DEBUG_PAGEALLOC <4>Modules linked in: af_iucv sunrpc qeth_l3 dm_multipath dm_mod qeth vmur ccwgroup <4>CPU: 0 Not tainted 2.6.30 #4 <4>Process iucv_sock_close (pid: 2486, task: 000000003aea4340, ksp: 000000003b75bc68) <4>Krnl PSW : 0704200180000000 000003e00168e23a (iucv_sock_kill+0x2e/0xcc [af_iucv]) <4> R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:0 CC:2 PM:0 EA:3 <4>Krnl GPRS: 0000000000000000 000000003b75c000 000000003edd37f0 0000000000000001 <4> 000003e00168ec62 000000003988d960 0000000000000000 000003e0016b0608 <4> 000000003fe81b20 000000003839bb58 00000000399977f0 000000003edd37f0 <4> 000003e00168b000 000003e00168f138 000000003b75bcd0 000000003b75bc98 <4>Krnl Code: 000003e00168e22a: c0c0ffffe6eb larl %r12,3e00168b000 <4> 000003e00168e230: b90400b2 lgr %r11,%r2 <4> 000003e00168e234: e3e0f0980024 stg %r14,152(%r15) <4> >000003e00168e23a: e310225e0090 llgc %r1,606(%r2) <4> 000003e00168e240: a7110001 tmll %r1,1 <4> 000003e00168e244: a7840007 brc 8,3e00168e252 <4> 000003e00168e248: d507d00023c8 clc 0(8,%r13),968(%r2) <4> 000003e00168e24e: a7840009 brc 8,3e00168e260 <4>Call Trace: <4>([<000003e0016b0608>] afiucv_dbf+0x0/0xfffffffffffdea20 [af_iucv]) <4> [<000003e00168ec6c>] iucv_sock_close+0x130/0x368 [af_iucv] <4> [<000003e00168ef02>] iucv_sock_release+0x5e/0xe4 [af_iucv] <4> [<0000000000438e6c>] sock_release+0x44/0x104 <4> [<0000000000438f5e>] sock_close+0x32/0x50 <4> [<0000000000207898>] __fput+0xf4/0x250 <4> [<00000000002038aa>] filp_close+0x7a/0xa8 <4> [<00000000002039ba>] SyS_close+0xe2/0x148 <4> [<0000000000117c8e>] sysc_noemu+0x10/0x16 <4> [<00000042ff8deeac>] 0x42ff8deeac Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-09-16af_iucv: handle non-accepted sockets after resuming from suspendHendrik Brueckner1-0/+1
After resuming from suspend, all af_iucv sockets are disconnected. Ensure that iucv_accept_dequeue() can handle disconnected sockets which are not yet accepted. Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-09-16af_iucv: fix race in __iucv_sock_wait()Hendrik Brueckner1-1/+1
Moving prepare_to_wait before the condition to avoid a race between schedule_timeout and wake up. The race can appear during iucv_sock_connect() and iucv_callback_connack(). Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-09-14net: constify remaining proto_opsAlexey Dobriyan1-2/+2
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-07-09net: adding memory barrier to the poll and receive callbacksJiri Olsa1-2/+2
Adding memory barrier after the poll_wait function, paired with receive callbacks. Adding fuctions sock_poll_wait and sk_has_sleeper to wrap the memory barrier. Without the memory barrier, following race can happen. The race fires, when following code paths meet, and the tp->rcv_nxt and __add_wait_queue updates stay in CPU caches. CPU1 CPU2 sys_select receive packet ... ... __add_wait_queue update tp->rcv_nxt ... ... tp->rcv_nxt check sock_def_readable ... { schedule ... if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) wake_up_interruptible(sk->sk_sleep) ... } If there was no cache the code would work ok, since the wait_queue and rcv_nxt are opposit to each other. Meaning that once tp->rcv_nxt is updated by CPU2, the CPU1 either already passed the tp->rcv_nxt check and sleeps, or will get the new value for tp->rcv_nxt and will return with new data mask. In both cases the process (CPU1) is being added to the wait queue, so the waitqueue_active (CPU2) call cannot miss and will wake up CPU1. The bad case is when the __add_wait_queue changes done by CPU1 stay in its cache, and so does the tp->rcv_nxt update on CPU2 side. The CPU1 will then endup calling schedule and sleep forever if there are no more data on the socket. Calls to poll_wait in following modules were ommited: net/bluetooth/af_bluetooth.c net/irda/af_irda.c net/irda/irnet/irnet_ppp.c net/mac80211/rc80211_pid_debugfs.c net/phonet/socket.c net/rds/af_rds.c net/rfkill/core.c net/sunrpc/cache.c net/sunrpc/rpc_pipe.c net/tipc/socket.c Signed-off-by: Jiri Olsa <jolsa@redhat.com> Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-06-22Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6Linus Torvalds1-118/+179
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6: (43 commits) via-velocity: Fix velocity driver unmapping incorrect size. mlx4_en: Remove redundant refill code on RX mlx4_en: Removed redundant check on lso header size mlx4_en: Cancel port_up check in transmit function mlx4_en: using stop/start_all_queues mlx4_en: Removed redundant skb->len check mlx4_en: Counting all the dropped packets on the TX side usbnet cdc_subset: fix issues talking to PXA gadgets Net: qla3xxx, remove sleeping in atomic ipv4: fix NULL pointer + success return in route lookup path isdn: clean up documentation index cfg80211: validate station settings cfg80211: allow setting station parameters in mesh cfg80211: allow adding/deleting stations on mesh ath5k: fix beacon_int handling MAINTAINERS: Fix Atheros pattern paths ath9k: restore PS mode, before we put the chip into FULL SLEEP state. ath9k: wait for beacon frame along with CAB acer-wmi: fix rfkill conversion ath5k: avoid PCI FATAL interrupts by restoring RETRY_TIMEOUT disabling ...
2009-06-19af_iucv: Return -EAGAIN if iucv msg limit is exceededHendrik Brueckner1-41/+103
If the iucv message limit for a communication path is exceeded, sendmsg() returns -EAGAIN instead of -EPIPE. The calling application can then handle this error situtation, e.g. to try again after waiting some time. For blocking sockets, sendmsg() waits up to the socket timeout before returning -EAGAIN. For the new wait condition, a macro has been introduced and the iucv_sock_wait_state() has been refactored to this macro. Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-06-19af_iucv: Change if condition in sendmsg() for more readabilityHendrik Brueckner1-82/+81
Change the if condition to exit sendmsg() if the socket in not connected. Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-06-16[S390] PM: af_iucv power management callbacks.Ursula Braun1-3/+144
Patch establishes a dummy afiucv-device to make sure af_iucv is notified as iucv-bus device about suspend/resume. The PM freeze callback severs all iucv pathes of connected af_iucv sockets. The PM thaw/restore callback switches the state of all previously connected sockets to IUCV_DISCONN. Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2009-04-23af_iucv: Fix merge.Ursula Braun1-4/+0
From: Ursula Braun <ubraun@linux.vnet.ibm.com> net/iucv/af_iucv.c in net-next-2.6 is almost correct. 4 lines should still be deleted. These are the remaining changes: Signed-off-by: David S. Miller <davem@davemloft.net>
2009-04-23Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6David S. Miller1-7/+19
Conflicts: net/iucv/af_iucv.c
2009-04-23af_iucv: New socket option for setting IUCV MSGLIMITsHendrik Brueckner1-2/+25
The SO_MSGLIMIT socket option modifies the message limit for new IUCV communication paths. The message limit specifies the maximum number of outstanding messages that are allowed for connections. This setting can be lowered by z/VM when an IUCV connection is established. Expects an integer value in the range of 1 to 65535. The default value is 65535. The message limit must be set before calling connect() or listen() for sockets. If sockets are already connected or in state listen, changing the message limit is not supported. For reading the message limit value, unconnected sockets return the limit that has been set or the default limit. For connected sockets, the actual message limit is returned. The actual message limit is assigned by z/VM for each connection and it depends on IUCV MSGLIMIT authorizations specified for the z/VM guest virtual machine. Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-04-23af_iucv: cleanup and refactor recvmsg() EFAULT handlingHendrik Brueckner1-7/+3
If the skb cannot be copied to user iovec, always return -EFAULT. The skb is enqueued again, except MSG_PEEK flag is set, to allow user space applications to correct its iovec pointer. Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-04-23af_iucv: Provide new socket type SOCK_SEQPACKETHendrik Brueckner1-17/+56
This patch provides the socket type SOCK_SEQPACKET in addition to SOCK_STREAM. AF_IUCV sockets of type SOCK_SEQPACKET supports an 1:1 mapping of socket read or write operations to complete IUCV messages. Socket data or IUCV message data is not fragmented as this is the case for SOCK_STREAM sockets. The intention is to help application developers who write applications or device drivers using native IUCV interfaces (Linux kernel or z/VM IUCV interfaces). Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-04-23af_iucv: Modify iucv msg target class using control msghdrHendrik Brueckner1-4/+75
Allow 'classification' of socket data that is sent or received over an af_iucv socket. For classification of data, the target class of an (native) iucv message is used. This patch provides the cmsg interface for iucv_sock_recvmsg() and iucv_sock_sendmsg(). Applications can use the msg_control field of struct msghdr to set or get the target class as a "socket control message" (SCM/CMSG). Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-04-23af_iucv: Support data in IUCV msg parameter lists (IPRMDATA)Hendrik Brueckner1-20/+101
The patch allows to send and receive data in the parameter list of an iucv message. The parameter list is an arry of 8 bytes that are used by af_iucv as follows: 0..6 7 bytes for socket data and 7 1 byte to store the data length. Instead of storing the data length directly, the difference between 0xFF and the data length is used. This convention does not interfere with the existing use of PRM messages for shutting down the send direction of an AF_IUCV socket (shutdown() operation). Data lenghts greater than 7 (or PRM message byte 8 is less than 0xF8) denotes to special messages. Currently, the special SEND_SHUTDOWN message is supported only. To use IPRM messages, both communicators must set the IUCV_IPRMDATA flag during path negotiation, i.e. in iucv_connect() and path_pending(). To be compatible to older af_iucv implementations, sending PRM messages is controlled by the socket option SO_IPRMDATA_MSG. Receiving PRM messages does not depend on the socket option (but requires the IUCV_IPRMDATA path flag to be set). Sending/Receiving data in the parameter list improves performance for small amounts of data by reducing message_completion() interrupts and memory copy operations. Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-04-23af_iucv: add sockopt() to enable/disable use of IPRM_DATA msgsHendrik Brueckner1-3/+76
Provide the socket operations getsocktopt() and setsockopt() to enable/disable sending of data in the parameter list of IUCV messages. The patch sets respective flag only. Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-04-23af_iucv: sync sk shutdown flag if iucv path is quiescedHendrik Brueckner1-1/+18
If the af_iucv communication partner quiesces the path to shutdown its receive direction, provide a quiesce callback implementation to shutdown the (local) send direction. This ensures that both sides are synchronized. Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-04-21af_iucv: Fix race when queuing incoming iucv messagesHendrik Brueckner1-3/+5
AF_IUCV runs into a race when queuing incoming iucv messages and receiving the resulting backlog. If the Linux system is under pressure (high load or steal time), the message queue grows up, but messages are not received and queued onto the backlog queue. In that case, applications do not receive any data with recvmsg() even if AF_IUCV puts incoming messages onto the message queue. The race can be avoided if the message queue spinlock in the message_pending callback is spreaded across the entire callback function. Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-04-21af_iucv: Test additional sk states in iucv_sock_shutdownHendrik Brueckner1-0/+3
Add few more sk states in iucv_sock_shutdown(). Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-04-21af_iucv: Reject incoming msgs if RECV_SHUTDOWN is setHendrik Brueckner1-1/+3
Reject incoming iucv messages if the receive direction has been shut down. It avoids that the queue of outstanding messages increases and exceeds the message limit of the iucv communication path. Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-04-21af_iucv: fix oops in iucv_sock_recvmsg() for MSG_PEEK flagHendrik Brueckner1-3/+3
If iucv_sock_recvmsg() is called with MSG_PEEK flag set, the skb is enqueued twice. If the socket is then closed, the pointer to the skb is freed twice. Remove the skb_queue_head() call for MSG_PEEK, because the skb_recv_datagram() function already handles MSG_PEEK (does not dequeue the skb). Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-04-21af_iucv: consider state IUCV_CLOSING when closing a socketUrsula Braun1-0/+3
Make sure a second invocation of iucv_sock_close() guarantees proper freeing of an iucv path. Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-02-26iucv: remove some pointless conditionals before kfree_skb()Wei Yongjun1-2/+1
Remove some pointless conditionals before kfree_skb(). Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-01-05af_iucv: Free iucv path/socket in path_pending callbackHendrik Brueckner1-0/+5
Free iucv path after iucv_path_sever() calls in iucv_callback_connreq() (path_pending() iucv callback). If iucv_path_accept() fails, free path and free/kill newly created socket. Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-01-05af_iucv: avoid left over IUCV connections from failing connectsUrsula Braun1-0/+7
For certain types of AFIUCV socket connect failures IUCV connections are left over. Add some cleanup-statements to avoid cluttered IUCV connections. Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-01-05af_iucv: New error return codes for connect()Hendrik Brueckner1-1/+15
If the iucv_path_connect() call fails then return an error code that corresponds to the iucv_path_connect() failure condition; instead of returning -ECONNREFUSED for any failure. This helps to improve error handling for user space applications (e.g. inform the user that the z/VM guest is not authorized to connect to other guest virtual machines). The error return codes are based on those described in connect(2). Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com> Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2008-12-25[S390] convert iucv printks to dev_xxx and pr_xxx macros.Ursula Braun1-3/+16
Signed-off-by: Ursula Braun <braunu@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
2008-07-18Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6David S. Miller1-6/+2
Conflicts: Documentation/powerpc/booting-without-of.txt drivers/atm/Makefile drivers/net/fs_enet/fs_enet-main.c drivers/pci/pci-acpi.c net/8021q/vlan.c net/iucv/iucv.c
2008-07-14[S390] Cleanup iucv printk messages.Ursula Braun1-6/+2
Cc: David S. Miller <davem@davemloft.net> Signed-off-by: Ursula Braun <braunu@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
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