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can: add hash based access to single EFF frame filters

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In contrast to the direct access to the single SFF frame filters (which are
indexed by the SFF CAN ID itself) the single EFF frame filters are arranged
in a single linked hlist. To reduce the hlist traversal in the case of many
filter subscriptions a hash based access is introduced for single EFF filters.

Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Oliver Hartkopp
2014-04-02 20:25:26 +02:00
committed by Marc Kleine-Budde
parent e3d3917f3d
commit 45c700291a
3 changed files with 75 additions and 9 deletions
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5
net/can/af_can.h
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@@ -60,13 +60,16 @@ struct receiver {
};
#define CAN_SFF_RCV_ARRAY_SZ (1 << CAN_SFF_ID_BITS)
#define CAN_EFF_RCV_HASH_BITS 10
#define CAN_EFF_RCV_ARRAY_SZ (1 << CAN_EFF_RCV_HASH_BITS)
enum { RX_ERR, RX_ALL, RX_FIL, RX_INV, RX_EFF, RX_MAX };
enum { RX_ERR, RX_ALL, RX_FIL, RX_INV, RX_MAX };
/* per device receive filters linked at dev->ml_priv */
struct dev_rcv_lists {
struct hlist_head rx[RX_MAX];
struct hlist_head rx_sff[CAN_SFF_RCV_ARRAY_SZ];
struct hlist_head rx_eff[CAN_EFF_RCV_ARRAY_SZ];
int remove_on_zero_entries;
int entries;
};