mirror of https://gitee.com/openkylin/qemu.git
136 lines
3.5 KiB
C
136 lines
3.5 KiB
C
/*
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* Virtio-net driver for the s390-ccw firmware
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*
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* Copyright 2017 Thomas Huth, Red Hat Inc.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <stdint.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/socket.h>
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#include <ethernet.h>
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#include "s390-ccw.h"
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#include "virtio.h"
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#ifndef DEBUG_VIRTIO_NET
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#define DEBUG_VIRTIO_NET 0
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#endif
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#define VIRTIO_NET_F_MAC_BIT (1 << 5)
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#define VQ_RX 0 /* Receive queue */
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#define VQ_TX 1 /* Transmit queue */
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struct VirtioNetHdr {
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uint8_t flags;
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uint8_t gso_type;
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uint16_t hdr_len;
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uint16_t gso_size;
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uint16_t csum_start;
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uint16_t csum_offset;
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/*uint16_t num_buffers;*/ /* Only with VIRTIO_NET_F_MRG_RXBUF or VIRTIO1 */
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};
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typedef struct VirtioNetHdr VirtioNetHdr;
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static uint16_t rx_last_idx; /* Last index in receive queue "used" ring */
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int virtio_net_init(void *mac_addr)
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{
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VDev *vdev = virtio_get_device();
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VRing *rxvq = &vdev->vrings[VQ_RX];
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void *buf;
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int i;
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vdev->guest_features[0] = VIRTIO_NET_F_MAC_BIT;
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virtio_setup_ccw(vdev);
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IPL_assert(vdev->guest_features[0] & VIRTIO_NET_F_MAC_BIT,
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"virtio-net device does not support the MAC address feature");
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memcpy(mac_addr, vdev->config.net.mac, ETH_ALEN);
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for (i = 0; i < 64; i++) {
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buf = malloc(ETH_MTU_SIZE + sizeof(VirtioNetHdr));
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IPL_assert(buf != NULL, "Can not allocate memory for receive buffers");
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vring_send_buf(rxvq, buf, ETH_MTU_SIZE + sizeof(VirtioNetHdr),
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VRING_DESC_F_WRITE);
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}
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vring_notify(rxvq);
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return 0;
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}
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int send(int fd, const void *buf, int len, int flags)
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{
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VirtioNetHdr tx_hdr;
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VDev *vdev = virtio_get_device();
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VRing *txvq = &vdev->vrings[VQ_TX];
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/* Set up header - we do not use anything special, so simply clear it */
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memset(&tx_hdr, 0, sizeof(tx_hdr));
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vring_send_buf(txvq, &tx_hdr, sizeof(tx_hdr), VRING_DESC_F_NEXT);
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vring_send_buf(txvq, (void *)buf, len, VRING_HIDDEN_IS_CHAIN);
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while (!vr_poll(txvq)) {
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yield();
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}
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if (drain_irqs(txvq->schid)) {
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puts("send: drain irqs failed");
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return -1;
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}
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return len;
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}
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int recv(int fd, void *buf, int maxlen, int flags)
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{
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VDev *vdev = virtio_get_device();
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VRing *rxvq = &vdev->vrings[VQ_RX];
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int len, id;
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uint8_t *pkt;
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if (rx_last_idx == rxvq->used->idx) {
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return 0;
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}
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len = rxvq->used->ring[rx_last_idx % rxvq->num].len - sizeof(VirtioNetHdr);
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if (len > maxlen) {
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puts("virtio-net: Receive buffer too small");
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len = maxlen;
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}
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id = rxvq->used->ring[rx_last_idx % rxvq->num].id % rxvq->num;
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pkt = (uint8_t *)(rxvq->desc[id].addr + sizeof(VirtioNetHdr));
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#if DEBUG_VIRTIO_NET /* Dump packet */
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int i;
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printf("\nbuf %p: len=%i\n", (void *)rxvq->desc[id].addr, len);
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for (i = 0; i < 64; i++) {
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printf(" %02x", pkt[i]);
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if ((i % 16) == 15) {
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printf("\n");
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}
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}
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printf("\n");
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#endif
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/* Copy data to destination buffer */
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memcpy(buf, pkt, len);
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/* Mark buffer as available to the host again */
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rxvq->avail->ring[rxvq->avail->idx % rxvq->num] = id;
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rxvq->avail->idx = rxvq->avail->idx + 1;
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vring_notify(rxvq);
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/* Move index to next entry */
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rx_last_idx = rx_last_idx + 1;
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return len;
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}
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