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rxrpc: Remove call->input_lock 

Remove call->input_lock as it was only necessary to serialise access to the
state stored in the rxrpc_call struct by simultaneous softirq handlers
presenting received packets.  They now dump the packets in a queue and a
single process-context handler now processes them.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org
This commit is contained in:
David Howells 2020-01-23 22:21:59 +00:00
parent ff7348254e
commit 4041a8ff65
3 changed files with 5 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
net/rxrpc/ar-internal.h
View File

@ -657,7 +657,6 @@ struct rxrpc_call {
rxrpc_seq_t rx_consumed; /* Highest packet consumed */
rxrpc_serial_t rx_serial; /* Highest serial received for this call */
u8 rx_winsize; /* Size of Rx window */
spinlock_t input_lock; /* Lock for packet input to this call */
/* TCP-style slow-start congestion control [RFC5681]. Since the SMSS
* is fixed, we keep these numbers in terms of segments (ie. DATA

1
net/rxrpc/call_object.c
View File

@ -143,7 +143,6 @@ struct rxrpc_call *rxrpc_alloc_call(struct rxrpc_sock *rx, gfp_t gfp,
init_waitqueue_head(&call->waitq);
spin_lock_init(&call->notify_lock);
spin_lock_init(&call->tx_lock);
spin_lock_init(&call->input_lock);
spin_lock_init(&call->acks_ack_lock);
rwlock_init(&call->state_lock);
refcount_set(&call->ref, 1);

22
net/rxrpc/input.c
View File

@ -588,8 +588,6 @@ static void rxrpc_input_data(struct rxrpc_call *call, struct sk_buff *skb)
}
}
spin_lock(&call->input_lock);
/* Received data implicitly ACKs all of the request packets we sent
* when we're acting as a client.
*/
@ -607,8 +605,6 @@ static void rxrpc_input_data(struct rxrpc_call *call, struct sk_buff *skb)
out:
trace_rxrpc_notify_socket(call->debug_id, serial);
rxrpc_notify_socket(call);
spin_unlock(&call->input_lock);
rxrpc_free_skb(skb, rxrpc_skb_put_input);
_leave(" [queued]");
}
@ -811,7 +807,7 @@ static void rxrpc_input_ack(struct rxrpc_call *call, struct sk_buff *skb)
offset = sizeof(struct rxrpc_wire_header);
if (skb_copy_bits(skb, offset, &ack, sizeof(ack)) < 0) {
rxrpc_proto_abort("XAK", call, 0);
goto out_not_locked;
goto out;
}
offset += sizeof(ack);
@ -863,7 +859,7 @@ static void rxrpc_input_ack(struct rxrpc_call *call, struct sk_buff *skb)
rxrpc_is_client_call(call)) {
rxrpc_set_call_completion(call, RXRPC_CALL_REMOTELY_ABORTED,
0, -ENETRESET);
return;
goto out;
}
/* If we get an OUT_OF_SEQUENCE ACK from the server, that can also
@ -877,7 +873,7 @@ static void rxrpc_input_ack(struct rxrpc_call *call, struct sk_buff *skb)
rxrpc_is_client_call(call)) {
rxrpc_set_call_completion(call, RXRPC_CALL_REMOTELY_ABORTED,
0, -ENETRESET);
return;
goto out;
}
/* Discard any out-of-order or duplicate ACKs (outside lock). */
@ -885,7 +881,7 @@ static void rxrpc_input_ack(struct rxrpc_call *call, struct sk_buff *skb)
trace_rxrpc_rx_discard_ack(call->debug_id, ack_serial,
first_soft_ack, call->acks_first_seq,
prev_pkt, call->acks_prev_seq);
goto out_not_locked;
goto out;
}
info.rxMTU = 0;
@ -893,14 +889,12 @@ static void rxrpc_input_ack(struct rxrpc_call *call, struct sk_buff *skb)
if (skb->len >= ioffset + sizeof(info) &&
skb_copy_bits(skb, ioffset, &info, sizeof(info)) < 0) {
rxrpc_proto_abort("XAI", call, 0);
goto out_not_locked;
goto out;
}
if (nr_acks > 0)
skb_condense(skb);
spin_lock(&call->input_lock);
/* Discard any out-of-order or duplicate ACKs (inside lock). */
if (!rxrpc_is_ack_valid(call, first_soft_ack, prev_pkt)) {
trace_rxrpc_rx_discard_ack(call->debug_id, ack_serial,
@ -992,8 +986,6 @@ static void rxrpc_input_ack(struct rxrpc_call *call, struct sk_buff *skb)
rxrpc_congestion_management(call, skb, &summary, acked_serial);
out:
spin_unlock(&call->input_lock);
out_not_locked:
rxrpc_free_skb(skb_put, rxrpc_skb_put_input);
rxrpc_free_skb(skb_old, rxrpc_skb_put_ack);
}
@ -1005,12 +997,8 @@ static void rxrpc_input_ackall(struct rxrpc_call *call, struct sk_buff *skb)
{
struct rxrpc_ack_summary summary = { 0 };
spin_lock(&call->input_lock);
if (rxrpc_rotate_tx_window(call, call->tx_top, &summary))
rxrpc_end_tx_phase(call, false, "ETL");
spin_unlock(&call->input_lock);
}
/*