hi all, i need some info as to how DMA is used by PCI devices ex. an ethernet card, how DMA fits in the whole picture. also there is a field in the net_device struct "dma" which holds the "DMA channel allocated by the device", what does this mean, is a seperate DMA controller used by each PCI device??? ne help's appreciated.... TIA - /dev/mandeep -----Original Message----- From: Anandraj [mailto:arm@tataelxsi.co.in] Sent: Friday, March 05, 2004 9:54 AM To: kernelnewbies-bounce@nl.linux.org; Mandeep Singh Sandhu; kernelnewbies@nl.linux.org Subject: RE: ethernet driver : how to allocate space for net_device struct Hi, the diffrence b/w alloc_etherdev(dev) and ether_setup() is the memory allocation for the device struct, In alloc_etherdev() u dnt have to allocate memory ,it is taken care by the api, but in ether_setup() u hav e 2 allocate memory for the dev struct b4 u pass it on to the api Hope this helps Rgds Anand > > -----Original Message----- > > From: kernelnewbies-bounce@nl.linux.org > > [mailto:kernelnewbies-bounce@nl.linux.org]On Behalf Of > > Mandeep Singh Sandhu > > Sent: Thursday, March 04, 2004 2:28 PM > > To: kernelnewbies@nl.linux.org > > Subject: ethernet driver : how to allocate space for > net_device struct > > > > > > hi all, > > in my ethernet driveres intialization function, how shud > > i allocate space for the net_device structure??? > > > > i have seen in 8139too.c a call to "alloc_etherdev(dev)". > > is this the preffered way to allocate space for the net_device > > struct. In rubini's book he has mentioned the use of > > "ether_setup" (there is no mention of "alloc_etherdev") > > to partially fill up the net_device struct, but this fxn > > is not used in some real world drivers like the driver for > > realtek card (8139too.c). where can i get info on what > > functions like "alloc_etherdev" do??? > > > > TIA > > - /dev/mandeep > > > > -- > > Kernelnewbies: Help each other learn about the Linux kernel. > > Archive: http://mail.nl.linux.org/kernelnewbies/ > > FAQ: http://kernelnewbies.org/faq/ > > > -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
