diff options
| author | Giuseppe CAVALLARO <peppe.cavallaro@st.com> | 2011-10-18 00:01:24 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2011-10-19 19:24:18 -0400 |
| commit | 286a837217204b1ef105e3a554d0757e4fdfaac1 (patch) | |
| tree | 466ed6dbe1e6281173adc57cf09a40e86f0c80fd /drivers/net/ethernet/stmicro/stmmac/Kconfig | |
| parent | 38fe7a93fc734357c4811f1c710b1906a87d315c (diff) | |
stmmac: add CHAINED descriptor mode support (V4)
This patch enhances the STMMAC driver to support CHAINED mode of
descriptor.
STMMAC supports DMA descriptor to operate both in dual buffer(RING)
and linked-list(CHAINED) mode. In RING mode (default) each descriptor
points to two data buffer pointers whereas in CHAINED mode they point
to only one data buffer pointer.
In CHAINED mode each descriptor will have pointer to next descriptor in
the list, hence creating the explicit chaining in the descriptor itself,
whereas such explicit chaining is not possible in RING mode.
First version of this work has been done by Rayagond.
Then the patch has been reworked avoiding ifdef inside the C code.
A new header file has been added to define all the functions needed for
managing enhanced and normal descriptors.
In fact, these have to be specialized according to the ring/chain usage.
Two new C files have been also added to implement the helper routines
needed to manage: jumbo frames, chain and ring setup (i.e. desc3).
Signed-off-by: Rayagond Kokatanur <rayagond@vayavyalabs.com>
Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/stmicro/stmmac/Kconfig')
| -rw-r--r-- | drivers/net/ethernet/stmicro/stmmac/Kconfig | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/net/ethernet/stmicro/stmmac/Kconfig b/drivers/net/ethernet/stmicro/stmmac/Kconfig index 8cd9ddec05a0..ac6f190743dd 100644 --- a/drivers/net/ethernet/stmicro/stmmac/Kconfig +++ b/drivers/net/ethernet/stmicro/stmmac/Kconfig @@ -63,4 +63,22 @@ config STMMAC_RTC_TIMER endchoice +choice + prompt "Select the DMA TX/RX descriptor operating modes" + depends on STMMAC_ETH + ---help--- + This driver supports DMA descriptor to operate both in dual buffer + (RING) and linked-list(CHAINED) mode. In RING mode each descriptor + points to two data buffer pointers whereas in CHAINED mode they + points to only one data buffer pointer. + +config STMMAC_RING + bool "Enable Descriptor Ring Mode" + +config STMMAC_CHAINED + bool "Enable Descriptor Chained Mode" + +endchoice + + endif |