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ieee1394: save RAM by using a single tlabel for broadcast transactions

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Since broadcast transactions are already complete when the request has
been sent, the same transaction label can be reused all over again, see
IEEE 1394 7.3.2.5 and 6.2.4.3.  Therefore we can reduce the footprint
of struct hpsb_host by the size of one struct hpsb_tlabel_pool.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Ben Collins <bcollins@ubuntu.com>
This commit is contained in:
Ben Collins 2006-06-12 18:12:49 -04:00
parent 647dcb5fae
commit eaf88450d2
2 changed files with 16 additions and 10 deletions
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4
drivers/ieee1394/hosts.h
View File

@ -33,7 +33,7 @@ struct hpsb_host {
int node_count; /* number of identified nodes on this bus */
int selfid_count; /* total number of SelfIDs received */
int nodes_active; /* number of nodes with active link layer */
u8 speed[63]; /* speed between each node and local node */
u8 speed[ALL_NODES]; /* speed between each node and local node */
nodeid_t node_id; /* node ID of this host */
nodeid_t irm_id; /* ID of this bus' isochronous resource manager */
@ -56,7 +56,7 @@ struct hpsb_host {
struct csr_control csr;
/* Per node tlabel pool allocation */
struct hpsb_tlabel_pool tpool[64];
struct hpsb_tlabel_pool tpool[ALL_NODES];
struct hpsb_host_driver *driver;

10
drivers/ieee1394/ieee1394_transactions.c
View File

@ -136,8 +136,11 @@ int hpsb_get_tlabel(struct hpsb_packet *packet)
{
unsigned long flags;
struct hpsb_tlabel_pool *tp;
int n = NODEID_TO_NODE(packet->node_id);
tp = &packet->host->tpool[packet->node_id & NODE_MASK];
if (unlikely(n == ALL_NODES))
return 0;
tp = &packet->host->tpool[n];
if (irqs_disabled() || in_atomic()) {
if (down_trylock(&tp->count))
@ -175,8 +178,11 @@ void hpsb_free_tlabel(struct hpsb_packet *packet)
{
unsigned long flags;
struct hpsb_tlabel_pool *tp;
int n = NODEID_TO_NODE(packet->node_id);
tp = &packet->host->tpool[packet->node_id & NODE_MASK];
if (unlikely(n == ALL_NODES))
return;
tp = &packet->host->tpool[n];
BUG_ON(packet->tlabel > 63 || packet->tlabel < 0);