This is the mail archive of the ecos-discuss@sources.redhat.com mailing list for the eCos project.


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

Async Ethernet driver API..


Hi:

I have an working Ethernet driver that uses programmed i/o. I want to change it to
use DMA instead of pro i/o.
For the Rx side, the flow of func calls is as below.


eth_drv_dsr()--> deliver()->poll()--> determines if it is a Rx/Tx interrupt.
if Rx, poll()-> Rx-Event()->eth_drv_recv(). eth_drv_recv() allocates the SG buffer and calls back into the hw driver hw_recv(). This call into the hw driver is a
synchronous call. Once this function returns eth_drv_recv() proceeds with further processing of the pkt by passing it up the protocol stack.


If i use DMA, then after setting up the DMA i would return from this function (hw_recv).But I dont want the upper layer to contiinue processing the pkt since DMA would not have completed yet. Once DMA is complete I want to call into the upper layer func to process the pkt.
Is there any way this API can be made Asynchronous..


Thanks,
/Badri



-- Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss


Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]