| Message ID | 30758547c49f254b3965fc12500735bea8265c97.1594725647.git.pisa@cmp.felk.cvut.cz |
|---|---|
| State | New |
| Headers | show |
| Series | CTU CAN FD core support | expand |
On Tue, Jul 14, 2020 at 02:20:16PM +0200, pisa@cmp.felk.cvut.cz wrote: Hi Pavel, > From: Jan Charvat <charvj10@fel.cvut.cz> > > Signed-off-by: Jan Charvat <charvj10@fel.cvut.cz> > Signed-off-by: Pavel Pisa <pisa@cmp.felk.cvut.cz> > --- > include/net/can_emu.h | 4 ++++ > net/can/can_core.c | 36 ++++++++++++++++++++++++++++++++++++ > 2 files changed, 40 insertions(+) > > diff --git a/include/net/can_emu.h b/include/net/can_emu.h > index c6164dcfb4..7d395fbb9b 100644 > --- a/include/net/can_emu.h > +++ b/include/net/can_emu.h > @@ -127,4 +127,8 @@ 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); > + These function are aimed for canfd. Perhaps rename these to canfd_dlc2len and canfd_len2dlc for better distinction? Rest of the patch looks good to me. > #endif > diff --git a/net/can/can_core.c b/net/can/can_core.c > index 90f4d8576a..0115d78794 100644 > --- a/net/can/can_core.c > +++ b/net/can/can_core.c > @@ -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; > > -- > 2.20.1 > >
On Thu, Sep 03, 2020 at 08:12:42AM +0200, Pavel Pisa wrote: Hey Pavel, Thanks for clarifying this and sharing the relevant links. Regards, Vikram > Hello Vikram, > > On Thursday 03 of September 2020 07:43:34 Vikram Garhwal wrote: > > On Tue, Jul 14, 2020 at 02:20:16PM +0200, pisa@cmp.felk.cvut.cz wrote: > > Hi Pavel, > > > > > From: Jan Charvat <charvj10@fel.cvut.cz> > > > > > > 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> > > > --- > > > include/net/can_emu.h | 4 ++++ > > > net/can/can_core.c | 36 ++++++++++++++++++++++++++++++++++++ > > > 2 files changed, 40 insertions(+) > > > > > > diff --git a/include/net/can_emu.h b/include/net/can_emu.h > > > index c6164dcfb4..7d395fbb9b 100644 > > > --- a/include/net/can_emu.h > > > +++ b/include/net/can_emu.h > > > @@ -127,4 +127,8 @@ 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); > > > + > > > > These function are aimed for canfd. Perhaps rename these to canfd_dlc2len > > and canfd_len2dlc for better distinction? > > Rest of the patch looks good to me. > > I do not insits on name. But function correspond 1:1 to the Linux > kernel ones > > https://elixir.bootlin.com/linux/latest/source/drivers/net/can/dev.c#L34 > > These functions/tables are very short, but may it be, we should add comment > about their origin. This part of original file is Oliver Hartkopp > contribution > > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/net/can/dev.c?h=v5.9-rc3&id=1e0625facab2e871472472b7df87d8fbe6caf75a > > some other helpers are from Wolfgang Grandegger and me. > > Best wishes, > > Pavel
diff --git a/include/net/can_emu.h b/include/net/can_emu.h index c6164dcfb4..7d395fbb9b 100644 --- a/include/net/can_emu.h +++ b/include/net/can_emu.h @@ -127,4 +127,8 @@ 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 diff --git a/net/can/can_core.c b/net/can/can_core.c index 90f4d8576a..0115d78794 100644 --- a/net/can/can_core.c +++ b/net/can/can_core.c @@ -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;