lguest: the net driver
Lguest net driver A simple net driver for lguest. [akpm@linux-foundation.org: include fix] Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Cc: Andi Kleen <ak@suse.de> Cc: Jeff Garzik <jeff@garzik.org> Acked-by: James Morris <jmorris@namei.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Rusty Russell
Linus Torvalds
parent
3f8c4d3f82
commit
d503e2fa5a
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@ -177,6 +177,7 @@ obj-$(CONFIG_ZORRO8390) += zorro8390.o
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obj-$(CONFIG_HPLANCE) += hplance.o 7990.o
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obj-$(CONFIG_MVME147_NET) += mvme147.o 7990.o
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obj-$(CONFIG_EQUALIZER) += eql.o
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obj-$(CONFIG_LGUEST_GUEST) += lguest_net.o
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obj-$(CONFIG_MIPS_JAZZ_SONIC) += jazzsonic.o
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obj-$(CONFIG_MIPS_AU1X00_ENET) += au1000_eth.o
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obj-$(CONFIG_MIPS_SIM_NET) += mipsnet.o
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@ -0,0 +1,354 @@
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/* A simple network driver for lguest.
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*
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* Copyright 2006 Rusty Russell <rusty@rustcorp.com.au> IBM Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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//#define DEBUG
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/module.h>
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#include <linux/mm_types.h>
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#include <linux/io.h>
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#include <linux/lguest_bus.h>
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#define SHARED_SIZE PAGE_SIZE
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#define MAX_LANS 4
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#define NUM_SKBS 8
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struct lguestnet_info
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{
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/* The shared page(s). */
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struct lguest_net *peer;
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unsigned long peer_phys;
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unsigned long mapsize;
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/* The lguest_device I come from */
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struct lguest_device *lgdev;
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/* My peerid. */
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unsigned int me;
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/* Receive queue. */
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struct sk_buff *skb[NUM_SKBS];
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struct lguest_dma dma[NUM_SKBS];
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};
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/* How many bytes left in this page. */
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static unsigned int rest_of_page(void *data)
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{
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return PAGE_SIZE - ((unsigned long)data % PAGE_SIZE);
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}
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/* Simple convention: offset 4 * peernum. */
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static unsigned long peer_key(struct lguestnet_info *info, unsigned peernum)
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{
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return info->peer_phys + 4 * peernum;
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}
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static void skb_to_dma(const struct sk_buff *skb, unsigned int headlen,
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struct lguest_dma *dma)
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{
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unsigned int i, seg;
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for (i = seg = 0; i < headlen; seg++, i += rest_of_page(skb->data+i)) {
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dma->addr[seg] = virt_to_phys(skb->data + i);
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dma->len[seg] = min((unsigned)(headlen - i),
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rest_of_page(skb->data + i));
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}
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for (i = 0; i < skb_shinfo(skb)->nr_frags; i++, seg++) {
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const skb_frag_t *f = &skb_shinfo(skb)->frags[i];
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/* Should not happen with MTU less than 64k - 2 * PAGE_SIZE. */
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if (seg == LGUEST_MAX_DMA_SECTIONS) {
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printk("Woah dude! Megapacket!\n");
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break;
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}
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dma->addr[seg] = page_to_phys(f->page) + f->page_offset;
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dma->len[seg] = f->size;
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}
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if (seg < LGUEST_MAX_DMA_SECTIONS)
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dma->len[seg] = 0;
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}
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/* We overload multicast bit to show promiscuous mode. */
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#define PROMISC_BIT 0x01
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static void lguestnet_set_multicast(struct net_device *dev)
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{
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struct lguestnet_info *info = netdev_priv(dev);
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if ((dev->flags & (IFF_PROMISC|IFF_ALLMULTI)) || dev->mc_count)
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info->peer[info->me].mac[0] |= PROMISC_BIT;
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else
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info->peer[info->me].mac[0] &= ~PROMISC_BIT;
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}
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static int promisc(struct lguestnet_info *info, unsigned int peer)
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{
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return info->peer[peer].mac[0] & PROMISC_BIT;
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}
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static int mac_eq(const unsigned char mac[ETH_ALEN],
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struct lguestnet_info *info, unsigned int peer)
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{
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/* Ignore multicast bit, which peer turns on to mean promisc. */
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if ((info->peer[peer].mac[0] & (~PROMISC_BIT)) != mac[0])
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return 0;
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return memcmp(mac+1, info->peer[peer].mac+1, ETH_ALEN-1) == 0;
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}
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static void transfer_packet(struct net_device *dev,
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struct sk_buff *skb,
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unsigned int peernum)
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{
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struct lguestnet_info *info = netdev_priv(dev);
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struct lguest_dma dma;
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skb_to_dma(skb, skb_headlen(skb), &dma);
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pr_debug("xfer length %04x (%u)\n", htons(skb->len), skb->len);
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lguest_send_dma(peer_key(info, peernum), &dma);
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if (dma.used_len != skb->len) {
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dev->stats.tx_carrier_errors++;
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pr_debug("Bad xfer to peer %i: %i of %i (dma %p/%i)\n",
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peernum, dma.used_len, skb->len,
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(void *)dma.addr[0], dma.len[0]);
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} else {
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dev->stats.tx_bytes += skb->len;
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dev->stats.tx_packets++;
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}
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}
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static int unused_peer(const struct lguest_net peer[], unsigned int num)
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{
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return peer[num].mac[0] == 0;
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}
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static int lguestnet_start_xmit(struct sk_buff *skb, struct net_device *dev)
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{
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unsigned int i;
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int broadcast;
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struct lguestnet_info *info = netdev_priv(dev);
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const unsigned char *dest = ((struct ethhdr *)skb->data)->h_dest;
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pr_debug("%s: xmit %02x:%02x:%02x:%02x:%02x:%02x\n",
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dev->name, dest[0],dest[1],dest[2],dest[3],dest[4],dest[5]);
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broadcast = is_multicast_ether_addr(dest);
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for (i = 0; i < info->mapsize/sizeof(struct lguest_net); i++) {
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if (i == info->me || unused_peer(info->peer, i))
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continue;
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if (!broadcast && !promisc(info, i) && !mac_eq(dest, info, i))
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continue;
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pr_debug("lguestnet %s: sending from %i to %i\n",
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dev->name, info->me, i);
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transfer_packet(dev, skb, i);
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}
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dev_kfree_skb(skb);
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return 0;
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}
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/* Find a new skb to put in this slot in shared mem. */
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static int fill_slot(struct net_device *dev, unsigned int slot)
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{
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struct lguestnet_info *info = netdev_priv(dev);
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/* Try to create and register a new one. */
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info->skb[slot] = netdev_alloc_skb(dev, ETH_HLEN + ETH_DATA_LEN);
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if (!info->skb[slot]) {
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printk("%s: could not fill slot %i\n", dev->name, slot);
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return -ENOMEM;
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}
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skb_to_dma(info->skb[slot], ETH_HLEN + ETH_DATA_LEN, &info->dma[slot]);
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wmb();
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/* Now we tell hypervisor it can use the slot. */
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info->dma[slot].used_len = 0;
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return 0;
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}
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static irqreturn_t lguestnet_rcv(int irq, void *dev_id)
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{
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struct net_device *dev = dev_id;
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struct lguestnet_info *info = netdev_priv(dev);
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unsigned int i, done = 0;
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for (i = 0; i < ARRAY_SIZE(info->dma); i++) {
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unsigned int length;
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struct sk_buff *skb;
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length = info->dma[i].used_len;
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if (length == 0)
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continue;
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done++;
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skb = info->skb[i];
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fill_slot(dev, i);
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if (length < ETH_HLEN || length > ETH_HLEN + ETH_DATA_LEN) {
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pr_debug(KERN_WARNING "%s: unbelievable skb len: %i\n",
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dev->name, length);
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dev_kfree_skb(skb);
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continue;
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}
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skb_put(skb, length);
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skb->protocol = eth_type_trans(skb, dev);
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/* This is a reliable transport. */
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if (dev->features & NETIF_F_NO_CSUM)
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skb->ip_summed = CHECKSUM_UNNECESSARY;
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pr_debug("Receiving skb proto 0x%04x len %i type %i\n",
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ntohs(skb->protocol), skb->len, skb->pkt_type);
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dev->stats.rx_bytes += skb->len;
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dev->stats.rx_packets++;
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netif_rx(skb);
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}
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return done ? IRQ_HANDLED : IRQ_NONE;
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}
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static int lguestnet_open(struct net_device *dev)
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{
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int i;
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struct lguestnet_info *info = netdev_priv(dev);
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/* Set up our MAC address */
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memcpy(info->peer[info->me].mac, dev->dev_addr, ETH_ALEN);
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/* Turn on promisc mode if needed */
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lguestnet_set_multicast(dev);
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for (i = 0; i < ARRAY_SIZE(info->dma); i++) {
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if (fill_slot(dev, i) != 0)
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goto cleanup;
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}
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if (lguest_bind_dma(peer_key(info,info->me), info->dma,
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NUM_SKBS, lgdev_irq(info->lgdev)) != 0)
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goto cleanup;
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return 0;
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cleanup:
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while (--i >= 0)
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dev_kfree_skb(info->skb[i]);
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return -ENOMEM;
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}
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static int lguestnet_close(struct net_device *dev)
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{
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unsigned int i;
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struct lguestnet_info *info = netdev_priv(dev);
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/* Clear all trace: others might deliver packets, we'll ignore it. */
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memset(&info->peer[info->me], 0, sizeof(info->peer[info->me]));
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/* Deregister sg lists. */
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lguest_unbind_dma(peer_key(info, info->me), info->dma);
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for (i = 0; i < ARRAY_SIZE(info->dma); i++)
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dev_kfree_skb(info->skb[i]);
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return 0;
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}
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static int lguestnet_probe(struct lguest_device *lgdev)
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{
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int err, irqf = IRQF_SHARED;
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struct net_device *dev;
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struct lguestnet_info *info;
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struct lguest_device_desc *desc = &lguest_devices[lgdev->index];
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pr_debug("lguest_net: probing for device %i\n", lgdev->index);
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dev = alloc_etherdev(sizeof(struct lguestnet_info));
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if (!dev)
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return -ENOMEM;
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SET_MODULE_OWNER(dev);
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/* Ethernet defaults with some changes */
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ether_setup(dev);
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dev->set_mac_address = NULL;
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dev->dev_addr[0] = 0x02; /* set local assignment bit (IEEE802) */
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dev->dev_addr[1] = 0x00;
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memcpy(&dev->dev_addr[2], &lguest_data.guestid, 2);
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dev->dev_addr[4] = 0x00;
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dev->dev_addr[5] = 0x00;
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dev->open = lguestnet_open;
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dev->stop = lguestnet_close;
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dev->hard_start_xmit = lguestnet_start_xmit;
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/* Turning on/off promisc will call dev->set_multicast_list.
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* We don't actually support multicast yet */
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dev->set_multicast_list = lguestnet_set_multicast;
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SET_NETDEV_DEV(dev, &lgdev->dev);
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if (desc->features & LGUEST_NET_F_NOCSUM)
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dev->features = NETIF_F_SG|NETIF_F_NO_CSUM;
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info = netdev_priv(dev);
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info->mapsize = PAGE_SIZE * desc->num_pages;
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info->peer_phys = ((unsigned long)desc->pfn << PAGE_SHIFT);
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info->lgdev = lgdev;
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info->peer = lguest_map(info->peer_phys, desc->num_pages);
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if (!info->peer) {
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err = -ENOMEM;
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goto free;
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}
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/* This stores our peerid (upper bits reserved for future). */
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info->me = (desc->features & (info->mapsize-1));
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err = register_netdev(dev);
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if (err) {
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pr_debug("lguestnet: registering device failed\n");
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goto unmap;
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}
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if (lguest_devices[lgdev->index].features & LGUEST_DEVICE_F_RANDOMNESS)
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irqf |= IRQF_SAMPLE_RANDOM;
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if (request_irq(lgdev_irq(lgdev), lguestnet_rcv, irqf, "lguestnet",
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dev) != 0) {
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pr_debug("lguestnet: cannot get irq %i\n", lgdev_irq(lgdev));
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goto unregister;
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}
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pr_debug("lguestnet: registered device %s\n", dev->name);
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lgdev->private = dev;
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return 0;
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unregister:
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unregister_netdev(dev);
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unmap:
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lguest_unmap(info->peer);
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free:
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free_netdev(dev);
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return err;
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}
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static struct lguest_driver lguestnet_drv = {
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.name = "lguestnet",
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.owner = THIS_MODULE,
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.device_type = LGUEST_DEVICE_T_NET,
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.probe = lguestnet_probe,
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};
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static __init int lguestnet_init(void)
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{
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return register_lguest_driver(&lguestnet_drv);
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}
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module_init(lguestnet_init);
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MODULE_DESCRIPTION("Lguest network driver");
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MODULE_LICENSE("GPL");
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