2  * Virtio-net driver for the s390-ccw firmware
6  * This code is free software; you can redistribute it and/or modify it
8  * Free Software Foundation; either version 2 of the License, or (at your
20 #include "s390-ccw.h"
22 #include "s390-time.h"
26 #define DEBUG_VIRTIO_NET 0
29 #define VIRTIO_NET_F_MAC_BIT  (1 << 5)
31 #define VQ_RX 0         /* Receive queue */
32 #define VQ_TX 1         /* Transmit queue */
41     /*uint16_t num_buffers;*/ /* Only with VIRTIO_NET_F_MRG_RXBUF or VIRTIO1 */
50     VRing *rxvq = &vdev->vrings[VQ_RX];  in virtio_net_init()
56     vdev->guest_features[0] = VIRTIO_NET_F_MAC_BIT;  in virtio_net_init()
59     if (!(vdev->guest_features[0] & VIRTIO_NET_F_MAC_BIT)) {  in virtio_net_init()
60         puts("virtio-net device does not support the MAC address feature");  in virtio_net_init()
61         return -1;  in virtio_net_init()
64     memcpy(mac_addr, vdev->config.net.mac, ETH_ALEN);  in virtio_net_init()
77 int send(int fd, const void *buf, int len, int flags)  in send()  argument
81     VRing *txvq = &vdev->vrings[VQ_TX];  in send()
83     /* Set up header - we do not use anything special, so simply clear it */  in send()
87     vring_send_buf(txvq, (void *)buf, len, VRING_HIDDEN_IS_CHAIN);  in send()
91     if (drain_irqs(txvq->schid)) {  in send()
93         return -1;  in send()
96     return len;  in send()
102     VRing *rxvq = &vdev->vrings[VQ_RX];  in recv()
103     int len, id;  in recv()  local
106     if (rx_last_idx == rxvq->used->idx) {  in recv()
110     len = rxvq->used->ring[rx_last_idx % rxvq->num].len - sizeof(VirtioNetHdr);  in recv()
111     if (len > maxlen) {  in recv()
112         puts("virtio-net: Receive buffer too small");  in recv()
113         len = maxlen;  in recv()
115     id = rxvq->used->ring[rx_last_idx % rxvq->num].id % rxvq->num;  in recv()
116     pkt = (uint8_t *)(rxvq->desc[id].addr + sizeof(VirtioNetHdr));  in recv()
120     printf("\nbuf %p: len=%i\n", (void *)rxvq->desc[id].addr, len);  in recv()
131     memcpy(buf, pkt, len);  in recv()
134     rxvq->avail->ring[rxvq->avail->idx % rxvq->num] = id;  in recv()
135     rxvq->avail->idx = rxvq->avail->idx + 1;  in recv()
141     return len;  in recv()