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* net: misc: Remove extern from function prototypesJoe Perches2013-10-201-1/+1
| | | | | | | | | | | | | There are a mix of function prototypes with and without extern in the kernel sources. Standardize on not using extern for function prototypes. Function prototypes don't need to be written with extern. extern is assumed by the compiler. Its use is as unnecessary as using auto to declare automatic/local variables in a block. Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* rds: remove the second argument of k[un]map_atomic()Cong Wang2012-03-201-1/+1
| | | | | Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Cong Wang <amwang@redhat.com>
* treewide: use __printf not __attribute__((format(printf,...)))Joe Perches2011-11-011-4/+4
| | | | | | | | | | | | | | | | | Standardize the style for compiler based printf format verification. Standardized the location of __printf too. Done via script and a little typing. $ grep -rPl --include=*.[ch] -w "__attribute__" * | \ grep -vP "^(tools|scripts|include/linux/compiler-gcc.h)" | \ xargs perl -n -i -e 'local $/; while (<>) { s/\b__attribute__\s*\(\s*\(\s*format\s*\(\s*printf\s*,\s*(.+)\s*,\s*(.+)\s*\)\s*\)\s*\)/__printf($1, $2)/g ; print; }' [akpm@linux-foundation.org: revert arch bits] Signed-off-by: Joe Perches <joe@perches.com> Cc: "Kirill A. Shutemov" <kirill@shutemov.name> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* net: cleanup unused macros in net directoryShan Wei2011-01-201-1/+0
| | | | | | | | | | | Clean up some unused macros in net/*. 1. be left for code change. e.g. PGV_FROM_VMALLOC, PGV_FROM_VMALLOC, KMEM_SAFETYZONE. 2. never be used since introduced to kernel. e.g. P9_RDMA_MAX_SGE, UTIL_CTRL_PKT_SIZE. Signed-off-by: Shan Wei <shanwei@cn.fujitsu.com> Acked-by: Sjur Braendeland <sjur.brandeland@stericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* rds: make local functions/variables staticstephen hemminger2010-10-211-5/+0
| | | | | | | | | The RDS protocol has lots of functions that should be declared static. rds_message_get/add_version_extension is removed since it defined but never used. Signed-off-by: Stephen Hemminger <shemminger@vyatta.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* RDS: Implement masked atomic operationsAndy Grover2010-09-091-2/+12
| | | | | | | | | Add two CMSGs for masked versions of cswp and fadd. args struct modified to use a union for different atomic op type's arguments. Change IB to do masked atomic ops. Atomic op type in rds_message similarly unionized. Signed-off-by: Andy Grover <andy.grover@oracle.com>
* RDS/IB: print string constants in more placesZach Brown2010-09-091-0/+1
| | | | | | | | | This prints the constant identifier for work completion status and rdma cm event types, like we already do for IB event types. A core string array helper is added that each string type uses. Signed-off-by: Zach Brown <zach.brown@oracle.com>
* RDS: have sockets get transport module referencesZach Brown2010-09-091-0/+1
| | | | | | | | | | | | Right now there's nothing to stop the various paths that use rs->rs_transport from racing with rmmod and executing freed transport code. The simple fix is to have binding to a transport also hold a reference to the transport's module, removing this class of races. We already had an unused t_owner field which was set for the modular transports and which wasn't set for the built-in loop transport. Signed-off-by: Zach Brown <zach.brown@oracle.com>
* RDS: remove old rs_transport commentZach Brown2010-09-091-6/+0
| | | | | | | rs_transport is now also used by the rdma paths once the socket is bound. We don't need this stale comment to tell us what cscope can. Signed-off-by: Zach Brown <zach.brown@oracle.com>
* RDS: remove __init and __exit annotationZach Brown2010-09-091-5/+5
| | | | | | | The trivial amount of memory saved isn't worth the cost of dealing with section mismatches. Signed-off-by: Zach Brown <zach.brown@oracle.com>
* rds: fix rds_send_xmit() serializationZach Brown2010-09-091-3/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | rds_send_xmit() was changed to hold an interrupt masking spinlock instead of a mutex so that it could be called from the IB receive tasklet path. This broke the TCP transport because its xmit method can block and masks and unmasks interrupts. This patch serializes callers to rds_send_xmit() with a simple bit instead of the current spinlock or previous mutex. This enables rds_send_xmit() to be called from any context and to call functions which block. Getting rid of the c_send_lock exposes the bare c_lock acquisitions which are changed to block interrupts. A waitqueue is added so that rds_conn_shutdown() can wait for callers to leave rds_send_xmit() before tearing down partial send state. This lets us get rid of c_senders. rds_send_xmit() is changed to check the conn state after acquiring the RDS_IN_XMIT bit to resolve races with the shutdown path. Previously both worked with the conn state and then the lock in the same order, allowing them to race and execute the paths concurrently. rds_send_reset() isn't racing with rds_send_xmit() now that rds_conn_shutdown() properly ensures that rds_send_xmit() can't start once the conn state has been changed. We can remove its previous use of the spinlock. Finally, c_send_generation is redundant. Callers can race to test the c_flags bit by simply retrying instead of racing to test the c_send_generation atomic. Signed-off-by: Zach Brown <zach.brown@oracle.com>
* rds: remove unused rds_send_acked_before()Zach Brown2010-09-091-1/+0
| | | | | | | | rds_send_acked_before() wasn't blocking interrupts when acquiring c_lock from user context but nothing calls it. Rather than fix its use of c_lock we just remove the function. Signed-off-by: Zach Brown <zach.brown@oracle.com>
* RDS: introduce rds_conn_connect_if_down()Zach Brown2010-09-091-0/+1
| | | | | | | A few paths had the same block of code to queue a connection's connect work if it was in the right state. Let's move this in to a helper function. Signed-off-by: Zach Brown <zach.brown@oracle.com>
* rds: don't let RDS shutdown a connection while senders are presentChris Mason2010-09-091-0/+1
| | | | | | | | | | This is the first in a long line of patches that tries to fix races between RDS connection shutdown and RDS traffic. Here we are maintaining a count of active senders to make sure the connection doesn't go away while they are using it. Signed-off-by: Chris Mason <chris.mason@oracle.com>
* rds: Use RCU for the bind lookup searchesChris Mason2010-09-091-1/+1
| | | | | | | | | | | The RDS bind lookups are somewhat expensive in terms of CPU time and locking overhead. This commit changes them into a faster RCU based hash tree instead of the rbtrees they were using before. On large NUMA systems it is a significant improvement. Signed-off-by: Chris Mason <chris.mason@oracle.com>
* rds: per-rm flush_wait waitqChris Mason2010-09-091-0/+2
| | | | | | | | | | This removes a global waitqueue used to wait for rds messages and replaces it with a waitqueue inside the rds_message struct. The global waitqueue turns into a global lock and significantly bottlenecks operations on large machines. Signed-off-by: Chris Mason <chris.mason@oracle.com>
* RDS: Use a generation counter to avoid rds_send_xmit loopChris Mason2010-09-091-0/+1
| | | | | | | | | | | | | | | | | | rds_send_xmit is required to loop around after it releases the lock because someone else could done a trylock, found someone working on the list and backed off. But, once we drop our lock, it is possible that someone else does come in and make progress on the list. We should detect this and not loop around if another process is actually working on the list. This patch adds a generation counter that is bumped every time we get the lock and do some send work. If the retry notices someone else has bumped the generation counter, it does not need to loop around and continue working. Signed-off-by: Chris Mason <chris.mason@oracle.com> Signed-off-by: Andy Grover <andy.grover@oracle.com>
* RDS: Move atomic stats from general to ib-specific areaAndy Grover2010-09-091-2/+0
| | | | Signed-off-by: Andy Grover <andy.grover@oracle.com>
* RDS: Change send lock from a mutex to a spinlockAndy Grover2010-09-091-3/+3
| | | | | | | | | | | | | | | | | | This change allows us to call rds_send_xmit() from a tasklet, which is crucial to our new operating model. * Change c_send_lock to a spinlock * Update stats fields "sem_" to "_lock" * Remove unneeded rds_conn_is_sending() About locking between shutdown and send -- send checks if the connection is up. Shutdown puts the connection into DISCONNECTING. After this, all threads entering send will exit immediately. However, a thread could be *in* send_xmit(), so shutdown acquires the c_send_lock to ensure everyone is out before proceeding with connection shutdown. Signed-off-by: Andy Grover <andy.grover@oracle.com>
* RDS: Stop supporting old cong map sending methodAndy Grover2010-09-091-6/+0
| | | | | | | | | | | We now ask the transport to give us a rm for the congestion map, and then we handle it normally. Previously, the transport defined a function that we would call to send a congestion map. Convert TCP and loop transports to new cong map method. Signed-off-by: Andy Grover <andy.grover@oracle.com>
* RDS: Perform unmapping ops in stagesAndy Grover2010-09-091-1/+3
| | | | | | | | | | | | | | | | | | | | | | Previously, RDS would wait until the final send WR had completed and then handle cleanup. With silent ops, we do not know if an atomic, rdma, or data op will be last. This patch handles any of these cases by keeping a pointer to the last op in the message in m_last_op. When the TX completion event fires, rds dispatches to per-op-type cleanup functions, and then does whole-message cleanup, if the last op equalled m_last_op. This patch also moves towards having op-specific functions take the op struct, instead of the overall rm struct. rds_ib_connection has a pointer to keep track of a a partially- completed data send operation. This patch changes it from an rds_message pointer to the narrower rm_data_op pointer, and modifies places that use this pointer as needed. Signed-off-by: Andy Grover <andy.grover@oracle.com>
* RDS: Add flag for silent ops. Do atomic op before RDMAAndy Grover2010-09-091-0/+2
| | | | | | | | | | | | | Add a flag to the API so users can indicate they want silent operations. This is needed because silent ops cannot be used with USE_ONCE MRs, so we can't just assume silent. Also, change send_xmit to do atomic op before rdma op if both are present, and centralize the hairy logic to determine if we want to attempt silent, or not. Signed-off-by: Andy Grover <andy.grover@oracle.com>
* RDS: Move some variables around for consistencyAndy Grover2010-09-091-2/+6
| | | | | | Also, add a comment. Signed-off-by: Andy Grover <andy.grover@oracle.com>
* RDS: Rewrite rds_send_xmitAndy Grover2010-09-091-3/+2
| | | | | | | | | | | | | | | | Simplify rds_send_xmit(). Send a congestion map (via xmit_cong_map) without decrementing send_quota. Move resetting of conn xmit variables to end of loop. Update comments. Implement a special case to turn off sending an rds header when there is an atomic op and no other data. Signed-off-by: Andy Grover <andy.grover@oracle.com>
* RDS: Rename data op members prefix from m_ to op_Andy Grover2010-09-091-3/+3
| | | | | | For consistency. Signed-off-by: Andy Grover <andy.grover@oracle.com>
* RDS: Remove struct rds_rdma_opAndy Grover2010-09-091-22/+19
| | | | | | | | | | | | A big changeset, but it's all pretty dumb. struct rds_rdma_op was already embedded in struct rm_rdma_op. Remove rds_rdma_op and put its members in rm_rdma_op. Rename members with "op_" prefix instead of "r_", for consistency. Of course this breaks a lot, so fixup the code accordingly. Signed-off-by: Andy Grover <andy.grover@oracle.com>
* RDS: purge atomic resources too in rds_message_purge()Andy Grover2010-09-091-0/+1
| | | | | | | Add atomic_free_op function, analogous to rdma_free_op, and call it in rds_message_purge(). Signed-off-by: Andy Grover <andy.grover@oracle.com>
* RDS: Implement silent atomicsAndy Grover2010-09-091-1/+2
| | | | Signed-off-by: Andy Grover <andy.grover@oracle.com>
* RDS: inc_purge() transport function unused - remove itAndy Grover2010-09-091-2/+0
| | | | Signed-off-by: Andy Grover <andy.grover@oracle.com>
* RDS: Implement atomic operationsAndy Grover2010-09-091-3/+30
| | | | | | | | | | | | | | Implement a CMSG-based interface to do FADD and CSWP ops. Alter send routines to handle atomic ops. Add atomic counters to stats. Add xmit_atomic() to struct rds_transport Inline rds_ib_send_unmap_rdma into unmap_rm Signed-off-by: Andy Grover <andy.grover@oracle.com>
* RDS: make m_rdma_op a member of rds_messageAndy Grover2010-09-091-1/+1
| | | | | | | | | | | | | | This eliminates a separate memory alloc, although it is now necessary to add an "r_active" flag, since it is no longer to use the m_rdma_op pointer as an indicator of if an rdma op is present. rdma SGs allocated from rm sg pool. rds_rm_size also gets bigger. It's a little inefficient to run through CMSGs twice, but it makes later steps a lot smoother. Signed-off-by: Andy Grover <andy.grover@oracle.com>
* RDS: fold rdma.h into rds.hAndy Grover2010-09-091-0/+76
| | | | | | | RDMA is now an intrinsic part of RDS, so it's easier to just have a single header. Signed-off-by: Andy Grover <andy.grover@oracle.com>
* RDS: Explicitly allocate rm in sendmsg()Andy Grover2010-09-091-2/+5
| | | | | | | | | | | | | | r_m_copy_from_user used to allocate the rm as well as kernel buffers for the data, and then copy the data in. Now, sendmsg() allocates the rm, although the data buffer alloc still happens in r_m_copy_from_user. SGs are still allocated with rm, but now r_m_alloc_sgs() is used to reserve them. This allows multiple SG lists to be allocated from the one rm -- this is important once we also want to alloc our rdma sgl from this pool. Signed-off-by: Andy Grover <andy.grover@oracle.com>
* RDS: break out rdma and data ops into nested structs in rds_messageAndy Grover2010-09-091-5/+11
| | | | | | | Clearly separate rdma-related variables in rm from data-related ones. This is in anticipation of adding atomic support. Signed-off-by: Andy Grover <andy.grover@oracle.com>
* RDS: move rds_shutdown_worker impl. to rds_conn_shutdownAndy Grover2010-09-091-0/+2
| | | | | | This fits better in connection.c, rather than threads.c. Signed-off-by: Andy Grover <andy.grover@oracle.com>
* net: sk_sleep() helperEric Dumazet2010-04-211-1/+1
| | | | | | | | | | | | | | | | | 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>
* RDS: only put sockets that have seen congestion on the poll_waitqAndy Grover2010-03-171-0/+2
| | | | | | | | | | | | rds_poll_waitq's listeners will be awoken if we receive a congestion notification. Bad performance may result because *all* polled sockets contend for this single lock. However, it should not be necessary to wake pollers when a congestion update arrives if they have never experienced congestion, and not putting these on the waitq will hopefully greatly reduce contention. Signed-off-by: Andy Grover <andy.grover@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* RDS: Track transports via an array, not a listAndy Grover2009-08-241-0/+6
| | | | | | | | | | | | | Now that transports can be loaded in arbitrary order, it is important for rds_trans_get_preferred() to look for them in a particular order, instead of walking the list until it finds a transport that works for a given address. Now, each transport registers for a specific transport slot, and these are ordered so that preferred transports come first, and then if they are not loaded, other transports are queried. Signed-off-by: Andy Grover <andy.grover@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* net: mark read-only arrays as constJan Engelhardt2009-08-051-1/+2
| | | | | | | | String literals are constant, and usually, we can also tag the array of pointers const too, moving it to the .rodata section. Signed-off-by: Jan Engelhardt <jengelh@medozas.de> Signed-off-by: David S. Miller <davem@davemloft.net>
* Merge branch 'master' of ↵David S. Miller2009-05-191-1/+1
|\ | | | | | | | | | | | | master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 Conflicts: drivers/scsi/fcoe/fcoe.c
| * FRV: Fix the section attribute on UP DECLARE_PER_CPU()David Howells2009-04-221-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In non-SMP mode, the variable section attribute specified by DECLARE_PER_CPU() does not agree with that specified by DEFINE_PER_CPU(). This means that architectures that have a small data section references relative to a base register may throw up linkage errors due to too great a displacement between where the base register points and the per-CPU variable. On FRV, the .h declaration says that the variable is in the .sdata section, but the .c definition says it's actually in the .data section. The linker throws up the following errors: kernel/built-in.o: In function `release_task': kernel/exit.c:78: relocation truncated to fit: R_FRV_GPREL12 against symbol `per_cpu__process_counts' defined in .data section in kernel/built-in.o kernel/exit.c:78: relocation truncated to fit: R_FRV_GPREL12 against symbol `per_cpu__process_counts' defined in .data section in kernel/built-in.o To fix this, DECLARE_PER_CPU() should simply apply the same section attribute as does DEFINE_PER_CPU(). However, this is made slightly more complex by virtue of the fact that there are several variants on DEFINE, so these need to be matched by variants on DECLARE. Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* | RDS/IW+IB: Allow max credit advertise window.Steve Wise2009-04-101-1/+1
|/ | | | | | | | Fix hack that restricts the credit advertisement to 127. Signed-off-by: Steve Wise <swise@opengridcomputing.com> Signed-off-by: Andy Grover <andy.grover@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* RDS: Use spinlock to protect 64b value update on 32b archsAndy Grover2009-04-021-0/+4
| | | | | | | | | | | | | | | We have a 64bit value that needs to be set atomically. This is easy and quick on all 64bit archs, and can also be done on x86/32 with set_64bit() (uses cmpxchg8b). However other 32b archs don't have this. I actually changed this to the current state in preparation for mainline because the old way (using a spinlock on 32b) resulted in unsightly #ifdefs in the code. But obviously, being correct takes precedence. Signed-off-by: Andy Grover <andy.grover@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* RDS: Main header fileAndy Grover2009-02-271-0/+686
RDS's main data structure definitions and exported functions. Signed-off-by: Andy Grover <andy.grover@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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