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net/can: Add can_dlc2len and can_len2dlc for CAN FD.

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Signed-off-by: Jan Charvat <charvj10@fel.cvut.cz>
Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz>
Reviewed-by: Vikram Garhwal <fnu.vikram@xilinx.com>
Message-Id: <0a2efc6ef9c458505952ed230e49ae25cad7f324.1600069689.git.pisa@cmp.felk.cvut.cz>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Jan Charvat 2020-09-14 10:13:38 +02:00 committed by Paolo Bonzini
parent 46b25fe08b
commit ad0c6740d1
2 changed files with 40 additions and 0 deletions
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4
include/net/can_emu.h
View File

@ -122,4 +122,8 @@ int can_bus_client_set_filters(CanBusClientState *,
const struct qemu_can_filter *filters,
size_t filters_cnt);
uint8_t can_dlc2len(uint8_t can_dlc);
uint8_t can_len2dlc(uint8_t len);
#endif

36
net/can/can_core.c
View File

@ -33,6 +33,42 @@
#include "net/can_emu.h"
#include "qom/object_interfaces.h"
/* CAN DLC to real data length conversion helpers */
static const uint8_t dlc2len[] = {
0, 1, 2, 3, 4, 5, 6, 7,
8, 12, 16, 20, 24, 32, 48, 64
};
/* get data length from can_dlc with sanitized can_dlc */
uint8_t can_dlc2len(uint8_t can_dlc)
{
return dlc2len[can_dlc & 0x0F];
}
static const uint8_t len2dlc[] = {
0, 1, 2, 3, 4, 5, 6, 7, 8, /* 0 - 8 */
9, 9, 9, 9, /* 9 - 12 */
10, 10, 10, 10, /* 13 - 16 */
11, 11, 11, 11, /* 17 - 20 */
12, 12, 12, 12, /* 21 - 24 */
13, 13, 13, 13, 13, 13, 13, 13, /* 25 - 32 */
14, 14, 14, 14, 14, 14, 14, 14, /* 33 - 40 */
14, 14, 14, 14, 14, 14, 14, 14, /* 41 - 48 */
15, 15, 15, 15, 15, 15, 15, 15, /* 49 - 56 */
15, 15, 15, 15, 15, 15, 15, 15 /* 57 - 64 */
};
/* map the sanitized data length to an appropriate data length code */
uint8_t can_len2dlc(uint8_t len)
{
if (unlikely(len > 64)) {
return 0xF;
}
return len2dlc[len];
}
struct CanBusState {
Object object;