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2009-04-21FRV: Fix the section attribute on UP DECLARE_PER_CPU()David Howells
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>
2009-04-02RDS: Use spinlock to protect 64b value update on 32b archsAndy Grover
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>
2009-04-02RDS: Rewrite connection cleanup, fixing oops on rmmodAndy Grover
This fixes a bug where a connection was unexpectedly not on *any* list while being destroyed. It also cleans up some code duplication and regularizes some function names. * Grab appropriate lock in conn_free() and explain in comment * Ensure via locking that a conn is never not on either a dev's list or the nodev list * Add rds_xx_remove_conn() to match rds_xx_add_conn() * Make rds_xx_add_conn() return void * Rename remove_{,nodev_}conns() to destroy_{,nodev_}conns() and unify their implementation in a helper function * Document lock ordering as nodev conn_lock before dev_conn_lock Reported-by: Yosef Etigin <yosefe@voltaire.com> Signed-off-by: Andy Grover <andy.grover@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-04-02RDS: Fix m_rs_lock deadlockAndy Grover
rs_send_drop_to() is called during socket close. If it takes m_rs_lock without disabling interrupts, then rds_send_remove_from_sock() can run from the rx completion handler and thus deadlock. Signed-off-by: Andy Grover <andy.grover@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-03-03rds: fix iband RDMA dependenciesRandy Dunlap
Fix RDS Infiniband dependencies for RDMA so that these build errors won't happen: ERROR: "rdma_accept" [net/rds/rds.ko] undefined! ERROR: "rdma_destroy_id" [net/rds/rds.ko] undefined! ERROR: "rdma_connect" [net/rds/rds.ko] undefined! ERROR: "rdma_destroy_qp" [net/rds/rds.ko] undefined! ERROR: "rdma_listen" [net/rds/rds.ko] undefined! ERROR: "rdma_notify" [net/rds/rds.ko] undefined! ERROR: "rdma_create_id" [net/rds/rds.ko] undefined! ERROR: "rdma_create_qp" [net/rds/rds.ko] undefined! ERROR: "rdma_bind_addr" [net/rds/rds.ko] undefined! ERROR: "rdma_resolve_route" [net/rds/rds.ko] undefined! ERROR: "rdma_disconnect" [net/rds/rds.ko] undefined! ERROR: "rdma_reject" [net/rds/rds.ko] undefined! ERROR: "rdma_resolve_addr" [net/rds/rds.ko] undefined! Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Acked-by: Andy Grover <andy.grover@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-03-02rds: Fix build on powerpc.David S. Miller
As reported by Stephen Rothwell. > Today's linux-next build (powerpc allyesconfig) failed like this: > > net/rds/cong.c: In function 'rds_cong_set_bit': > net/rds/cong.c:284: error: implicit declaration of function 'generic___set_le_bit' > net/rds/cong.c: In function 'rds_cong_clear_bit': > net/rds/cong.c:298: error: implicit declaration of function 'generic___clear_le_bit' > net/rds/cong.c: In function 'rds_cong_test_bit': > net/rds/cong.c:309: error: implicit declaration of function 'generic_test_le_bit' Signed-off-by: David S. Miller <davem@davemloft.net>
2009-02-26RDS: Kconfig and MakefileAndy Grover
Add RDS Kconfig and Makefile, and modify net/'s to add us to the build. Signed-off-by: Andy Grover <andy.grover@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-02-26RDS: Common RDMA transport codeAndy Grover
Although most of IB and iWARP are separated from each other, there is some common code required to handle their shared CM listen port. This code listens for CM events and then dispatches the event to the appropriate transport, either IB or iWARP. Signed-off-by: Andy Grover <andy.grover@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-02-26RDS: Add iWARP supportAndy Grover
Support for iWARP NICs is implemented as a separate RDS transport from IB. The code, however, is very similar to IB (it was forked, basically.) so let's keep it in one changeset. The reason for this duplicationis that despite its similarity to IB, there are a number of places where it has different semantics. iwarp zcopy support is still under development, and giving it its own sandbox ensures that IB code isn't disrupted while iwarp changes. Over time these transports will re-converge. Signed-off-by: Andy Grover <andy.grover@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-02-26RDS/IB: Stats and sysctlsAndy Grover
IB-specific stats and sysctls. Signed-off-by: Andy Grover <andy.grover@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-02-26RDS/IB: Receive datagrams via IBAndy Grover
Header parsing, ring refill. It puts the incoming data into an rds_incoming struct, which is passed up to rds-core. Signed-off-by: Andy Grover <andy.grover@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-02-26RDS/IB: Implement IB-specific datagram send.Andy Grover
Specific to IB is a credits-based flow control mechanism, in addition to the expected usage of the IB API to package outgoing data into work requests. Signed-off-by: Andy Grover <andy.grover@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-02-26RDS/IB: Implement RDMA ops using FMRsAndy Grover
Signed-off-by: Andy Grover <andy.grover@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-02-26RDS/IB: Ring-handling code.Andy Grover
Signed-off-by: Andy Grover <andy.grover@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-02-26RDS/IB: Infiniband transportAndy Grover
Registers as an RDS transport and an IB client, and uses IB CM API to allocate ids, queue pairs, and the rest of that fun stuff. Signed-off-by: Andy Grover <andy.grover@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-02-26RDS: RDMA supportAndy Grover
Some transports may support RDMA features. This handles the non-transport-specific parts, like pinning user pages and tracking mapped regions. Signed-off-by: Andy Grover <andy.grover@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-02-26RDS: recv.cAndy Grover
Upon receiving a datagram from the transport, RDS parses the headers and potentially queues an ACK. Signed-off-by: Andy Grover <andy.grover@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-02-26RDS: send.cAndy Grover
This is the code to send an RDS datagram. Signed-off-by: Andy Grover <andy.grover@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-02-26RDS: Message parsingAndy Grover
Parsing of newly-received RDS message headers (including ext. headers) and copy-to/from-user routines. page.c implements a per-cpu page remainder cache, to reduce the number of allocations needed for small datagrams. Signed-off-by: Andy Grover <andy.grover@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-02-26RDS: sysctlsAndy Grover
RDS exposes a few tunable parameters via sysctls. Signed-off-by: Andy Grover <andy.grover@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-02-26RDS: loopbackAndy Grover
A simple rds transport to handle loopback connections. Signed-off-by: Andy Grover <andy.grover@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-02-26RDS: Connection handlingAndy Grover
While arguably the fact that the underlying transport needs a connection to convey RDS's datagrame reliably is not important to rds proper, the transports implemented so far (IB and TCP) have both been connection-oriented, and so the connection state machine-related code is in the common rds code. This patch also includes several work items, to handle connecting, sending, receiving, and shutdown. Signed-off-by: Andy Grover <andy.grover@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-02-26RDS: Info and statsAndy Grover
RDS currently generates a lot of stats that are accessible via the rds-info utility. This code implements the support for this. Signed-off-by: Andy Grover <andy.grover@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-02-26RDS: Transport codeAndy Grover
RDS supports multiple transports. While this initial submission only supports Infiniband transport, this abstraction allows others to be added. We're working on an iWARP transport, and also see UDP over DCB as another possibility. This code handles transport registration. Signed-off-by: Andy Grover <andy.grover@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-02-26RDS: Congestion-handling codeAndy Grover
RDS handles per-socket congestion by updating peers with a complete congestion map (8KB). This code keeps track of these maps for itself and ones received from peers. Signed-off-by: Andy Grover <andy.grover@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2009-02-26RDS: Main header fileAndy Grover
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>
2009-02-26RDS: Socket interfaceAndy Grover
Implement the RDS (Reliable Datagram Sockets) interface. Signed-off-by: Andy Grover <andy.grover@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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