I'm doing a strange thing and attempting to insert a new buffer into the receive ring of a network adapter. I believe that my problem comes in the form of incorrectly setting up DMA. I have looked at the documentation on DMA transfers and have found nothing wrong with what I'm doing. What happens? Once the network adapter gets around to dropping a packet into my buffer, the DMA transfer acts like it works, except that buffer has not been altered in any way. I actually check the buffer in the device driver interrupt code (as soon as the transfer is supposed to be complete). My setup: kernel 2.4.17 e1000-5.2.16 ethernet driver JUMBO packets Code Snippet: // insert my buffer for a receive // get the descriptor rx_desc = E1000_RX_DESC(*rx_ring,i); buffer_info = &rx_ring->buffer_info[i]; // unmap current mapping pci_unmap_single(pdev,buffer_info->dma,buffer_info->length,PCI_DMA_FROMDEVICE); // my new buffer skb->data = kmalloc(16476,GFP_ATOMIC); // reset the skb pointers skb->head = skb->data; skb->tail = skb->data; skb->end = skb->data + 16416; // leave room for shinfo struct // remap for DMA transfer buffer_info->dma = pci_map_single(pdev,skb->data,16384,PCI_DMA_FROMDEVICE); // setup the descriptor rx_desc->buffer_addr = cpu_to_le64(buffer_info->dma); Is this a DMA issue that I'm not understanding? Is this a sk_buff issue? Any thoughts and help would be most appreciated. Thanks. -joel - : send the line "unsubscribe linux-net" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
