diff options
author | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-04-27 09:26:46 -0700 |
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committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-04-27 09:26:46 -0700 |
commit | 15c54033964a943de7b0763efd3bd0ede7326395 (patch) | |
tree | 840b292612d1b5396d5bab5bde537a9013db3ceb /net/rxrpc/ar-skbuff.c | |
parent | ad5da3cf39a5b11a198929be1f2644e17ecd767e (diff) | |
parent | 912a41a4ab935ce8c4308428ec13fc7f8b1f18f4 (diff) |
Merge master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
* master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6: (448 commits)
[IPV4] nl_fib_lookup: Initialise res.r before fib_res_put(&res)
[IPV6]: Fix thinko in ipv6_rthdr_rcv() changes.
[IPV4]: Add multipath cached to feature-removal-schedule.txt
[WIRELESS] cfg80211: Clarify locking comment.
[WIRELESS] cfg80211: Fix locking in wiphy_new.
[WEXT] net_device: Don't include wext bits if not required.
[WEXT]: Misc code cleanups.
[WEXT]: Reduce inline abuse.
[WEXT]: Move EXPORT_SYMBOL statements where they belong.
[WEXT]: Cleanup early ioctl call path.
[WEXT]: Remove options.
[WEXT]: Remove dead debug code.
[WEXT]: Clean up how wext is called.
[WEXT]: Move to net/wireless
[AFS]: Eliminate cmpxchg() usage in vlocation code.
[RXRPC]: Fix pointers passed to bitops.
[RXRPC]: Remove bogus atomic_* overrides.
[AFS]: Fix u64 printing in debug logging.
[AFS]: Add "directory write" support.
[AFS]: Implement the CB.InitCallBackState3 operation.
...
Diffstat (limited to 'net/rxrpc/ar-skbuff.c')
-rw-r--r-- | net/rxrpc/ar-skbuff.c | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/net/rxrpc/ar-skbuff.c b/net/rxrpc/ar-skbuff.c new file mode 100644 index 00000000000..de755e04d29 --- /dev/null +++ b/net/rxrpc/ar-skbuff.c @@ -0,0 +1,132 @@ +/* ar-skbuff.c: socket buffer destruction handling + * + * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. + * Written by David Howells (dhowells@redhat.com) + * + * 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. + */ + +#include <linux/module.h> +#include <linux/net.h> +#include <linux/skbuff.h> +#include <net/sock.h> +#include <net/af_rxrpc.h> +#include "ar-internal.h" + +/* + * set up for the ACK at the end of the receive phase when we discard the final + * receive phase data packet + * - called with softirqs disabled + */ +static void rxrpc_request_final_ACK(struct rxrpc_call *call) +{ + /* the call may be aborted before we have a chance to ACK it */ + write_lock(&call->state_lock); + + switch (call->state) { + case RXRPC_CALL_CLIENT_RECV_REPLY: + call->state = RXRPC_CALL_CLIENT_FINAL_ACK; + _debug("request final ACK"); + + /* get an extra ref on the call for the final-ACK generator to + * release */ + rxrpc_get_call(call); + set_bit(RXRPC_CALL_ACK_FINAL, &call->events); + if (try_to_del_timer_sync(&call->ack_timer) >= 0) + rxrpc_queue_call(call); + break; + + case RXRPC_CALL_SERVER_RECV_REQUEST: + call->state = RXRPC_CALL_SERVER_ACK_REQUEST; + default: + break; + } + + write_unlock(&call->state_lock); +} + +/* + * drop the bottom ACK off of the call ACK window and advance the window + */ +static void rxrpc_hard_ACK_data(struct rxrpc_call *call, + struct rxrpc_skb_priv *sp) +{ + int loop; + u32 seq; + + spin_lock_bh(&call->lock); + + _debug("hard ACK #%u", ntohl(sp->hdr.seq)); + + for (loop = 0; loop < RXRPC_ACKR_WINDOW_ASZ; loop++) { + call->ackr_window[loop] >>= 1; + call->ackr_window[loop] |= + call->ackr_window[loop + 1] << (BITS_PER_LONG - 1); + } + + seq = ntohl(sp->hdr.seq); + ASSERTCMP(seq, ==, call->rx_data_eaten + 1); + call->rx_data_eaten = seq; + + if (call->ackr_win_top < UINT_MAX) + call->ackr_win_top++; + + ASSERTIFCMP(call->state <= RXRPC_CALL_COMPLETE, + call->rx_data_post, >=, call->rx_data_recv); + ASSERTIFCMP(call->state <= RXRPC_CALL_COMPLETE, + call->rx_data_recv, >=, call->rx_data_eaten); + + if (sp->hdr.flags & RXRPC_LAST_PACKET) { + rxrpc_request_final_ACK(call); + } else if (atomic_dec_and_test(&call->ackr_not_idle) && + test_and_clear_bit(RXRPC_CALL_TX_SOFT_ACK, &call->flags)) { + _debug("send Rx idle ACK"); + __rxrpc_propose_ACK(call, RXRPC_ACK_IDLE, sp->hdr.serial, + true); + } + + spin_unlock_bh(&call->lock); +} + +/* + * destroy a packet that has an RxRPC control buffer + * - advance the hard-ACK state of the parent call (done here in case something + * in the kernel bypasses recvmsg() and steals the packet directly off of the + * socket receive queue) + */ +void rxrpc_packet_destructor(struct sk_buff *skb) +{ + struct rxrpc_skb_priv *sp = rxrpc_skb(skb); + struct rxrpc_call *call = sp->call; + + _enter("%p{%p}", skb, call); + + if (call) { + /* send the final ACK on a client call */ + if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA) + rxrpc_hard_ACK_data(call, sp); + rxrpc_put_call(call); + sp->call = NULL; + } + + if (skb->sk) + sock_rfree(skb); + _leave(""); +} + +/** + * rxrpc_kernel_free_skb - Free an RxRPC socket buffer + * @skb: The socket buffer to be freed + * + * Let RxRPC free its own socket buffer, permitting it to maintain debug + * accounting. + */ +void rxrpc_kernel_free_skb(struct sk_buff *skb) +{ + rxrpc_free_skb(skb); +} + +EXPORT_SYMBOL(rxrpc_kernel_free_skb); |