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rxrpc: Drop channel number field from rxrpc_call struct 

Drop the channel number (channel) field from the rxrpc_call struct to
reduce the size of the call struct.  The field is redundant: if the call is
attached to a connection, the channel can be obtained from there by AND'ing
with RXRPC_CHANNELMASK.

Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells 2016-08-23 15:27:24 +01:00
parent f36b5e444c
commit 01a90a4598
5 changed files with 8 additions and 10 deletions
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1
net/rxrpc/ar-internal.h
View File

@ -432,7 +432,6 @@ struct rxrpc_call {
int error_report; /* Network error (ICMP/local transport) */
int error; /* Local error incurred */
enum rxrpc_call_state state : 8; /* current state of call */
u8 channel; /* connection channel occupied by this call */
u16 service_id; /* service ID */
u32 call_id; /* call ID on connection */
u32 cid; /* connection ID plus channel index */

7
net/rxrpc/call_object.c
View File

@ -317,7 +317,6 @@ struct rxrpc_call *rxrpc_incoming_call(struct rxrpc_sock *rx,
candidate->conn = conn;
candidate->cid = sp->hdr.cid;
candidate->call_id = sp->hdr.callNumber;
candidate->channel = chan;
candidate->rx_data_post = 0;
candidate->state = RXRPC_CALL_SERVER_ACCEPTING;
candidate->flags |= (1 << RXRPC_CALL_IS_SERVICE);
@ -330,7 +329,7 @@ struct rxrpc_call *rxrpc_incoming_call(struct rxrpc_sock *rx,
call = rcu_dereference_protected(conn->channels[chan].call,
lockdep_is_held(&conn->channel_lock));
_debug("channel[%u] is %p", candidate->channel, call);
_debug("channel[%u] is %p", candidate->cid & RXRPC_CHANNELMASK, call);
if (call && call->call_id == sp->hdr.callNumber) {
/* already set; must've been a duplicate packet */
_debug("extant call [%d]", call->state);
@ -677,8 +676,8 @@ static void rxrpc_destroy_call(struct work_struct *work)
struct rxrpc_call *call =
container_of(work, struct rxrpc_call, destroyer);
_enter("%p{%d,%d,%p}",
call, atomic_read(&call->usage), call->channel, call->conn);
_enter("%p{%d,%x,%p}",
call, atomic_read(&call->usage), call->cid, call->conn);
ASSERTCMP(call->state, ==, RXRPC_CALL_DEAD);

1
net/rxrpc/conn_client.c
View File

@ -280,7 +280,6 @@ attached:
found_channel:
_debug("found chan");
call->conn = conn;
call->channel = chan;
call->cid = conn->proto.cid | chan;
call->call_id = ++conn->channels[chan].call_counter;
conn->channels[chan].call_id = call->call_id;

5
net/rxrpc/conn_object.c
View File

@ -156,9 +156,10 @@ not_found:
void __rxrpc_disconnect_call(struct rxrpc_call *call)
{
struct rxrpc_connection *conn = call->conn;
struct rxrpc_channel *chan = &conn->channels[call->channel];
struct rxrpc_channel *chan =
&conn->channels[call->cid & RXRPC_CHANNELMASK];
_enter("%d,%d", conn->debug_id, call->channel);
_enter("%d,%x", conn->debug_id, call->cid);
if (rcu_access_pointer(chan->call) == call) {
/* Save the result of the call so that we can repeat it if necessary

4
net/rxrpc/rxkad.c
View File

@ -275,7 +275,7 @@ static int rxkad_secure_packet(struct rxrpc_call *call,
memcpy(&iv, call->conn->csum_iv.x, sizeof(iv));
/* calculate the security checksum */
x = call->channel << (32 - RXRPC_CIDSHIFT);
x = (call->cid & RXRPC_CHANNELMASK) << (32 - RXRPC_CIDSHIFT);
x |= sp->hdr.seq & 0x3fffffff;
call->crypto_buf[0] = htonl(sp->hdr.callNumber);
call->crypto_buf[1] = htonl(x);
@ -507,7 +507,7 @@ static int rxkad_verify_packet(struct rxrpc_call *call,
memcpy(&iv, call->conn->csum_iv.x, sizeof(iv));
/* validate the security checksum */
x = call->channel << (32 - RXRPC_CIDSHIFT);
x = (call->cid & RXRPC_CHANNELMASK) << (32 - RXRPC_CIDSHIFT);
x |= sp->hdr.seq & 0x3fffffff;
call->crypto_buf[0] = htonl(call->call_id);
call->crypto_buf[1] = htonl(x);