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![Julia Lawall](/assets/img/avatar_default.png)
The definitions of vnet_ops and ehea_netdev_ops have initializations of a local function and eth_change_mtu for their respective ndo_change_mtu fields. This change uses only the local function. The semantic match that finds this problem is as follows: (http://coccinelle.lip6.fr/) // <smpl> @r@ identifier I, s, fld; position p0,p; expression E; @@ struct I s =@p0 { ... .fld@p = E, ...}; @s@ identifier I, s, r.fld; position r.p0,p; expression E; @@ struct I s =@p0 { ... .fld@p = E, ...}; @script:python@ p0 << r.p0; fld << r.fld; ps << s.p; pr << r.p; @@ if int(ps[0].line)!=int(pr[0].line) or int(ps[0].column)!=int(pr[0].column): cocci.print_main(fld,p0) // </smpl> Signed-off-by: Julia Lawall <julia@diku.dk> Signed-off-by: David S. Miller <davem@davemloft.net>
1296 lines
28 KiB
C
1296 lines
28 KiB
C
/* sunvnet.c: Sun LDOM Virtual Network Driver.
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*
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* Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/netdevice.h>
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#include <linux/ethtool.h>
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#include <linux/etherdevice.h>
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#include <linux/mutex.h>
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#include <asm/vio.h>
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#include <asm/ldc.h>
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#include "sunvnet.h"
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#define DRV_MODULE_NAME "sunvnet"
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#define PFX DRV_MODULE_NAME ": "
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#define DRV_MODULE_VERSION "1.0"
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#define DRV_MODULE_RELDATE "June 25, 2007"
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static char version[] __devinitdata =
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DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
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MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
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MODULE_DESCRIPTION("Sun LDOM virtual network driver");
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MODULE_LICENSE("GPL");
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MODULE_VERSION(DRV_MODULE_VERSION);
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/* Ordered from largest major to lowest */
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static struct vio_version vnet_versions[] = {
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{ .major = 1, .minor = 0 },
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};
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static inline u32 vnet_tx_dring_avail(struct vio_dring_state *dr)
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{
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return vio_dring_avail(dr, VNET_TX_RING_SIZE);
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}
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static int vnet_handle_unknown(struct vnet_port *port, void *arg)
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{
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struct vio_msg_tag *pkt = arg;
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printk(KERN_ERR PFX "Received unknown msg [%02x:%02x:%04x:%08x]\n",
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pkt->type, pkt->stype, pkt->stype_env, pkt->sid);
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printk(KERN_ERR PFX "Resetting connection.\n");
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ldc_disconnect(port->vio.lp);
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return -ECONNRESET;
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}
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static int vnet_send_attr(struct vio_driver_state *vio)
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{
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struct vnet_port *port = to_vnet_port(vio);
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struct net_device *dev = port->vp->dev;
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struct vio_net_attr_info pkt;
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int i;
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memset(&pkt, 0, sizeof(pkt));
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pkt.tag.type = VIO_TYPE_CTRL;
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pkt.tag.stype = VIO_SUBTYPE_INFO;
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pkt.tag.stype_env = VIO_ATTR_INFO;
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pkt.tag.sid = vio_send_sid(vio);
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pkt.xfer_mode = VIO_DRING_MODE;
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pkt.addr_type = VNET_ADDR_ETHERMAC;
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pkt.ack_freq = 0;
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for (i = 0; i < 6; i++)
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pkt.addr |= (u64)dev->dev_addr[i] << ((5 - i) * 8);
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pkt.mtu = ETH_FRAME_LEN;
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viodbg(HS, "SEND NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] "
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"ackfreq[%u] mtu[%llu]\n",
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pkt.xfer_mode, pkt.addr_type,
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(unsigned long long) pkt.addr,
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pkt.ack_freq,
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(unsigned long long) pkt.mtu);
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return vio_ldc_send(vio, &pkt, sizeof(pkt));
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}
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static int handle_attr_info(struct vio_driver_state *vio,
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struct vio_net_attr_info *pkt)
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{
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viodbg(HS, "GOT NET ATTR INFO xmode[0x%x] atype[0x%x] addr[%llx] "
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"ackfreq[%u] mtu[%llu]\n",
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pkt->xfer_mode, pkt->addr_type,
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(unsigned long long) pkt->addr,
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pkt->ack_freq,
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(unsigned long long) pkt->mtu);
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pkt->tag.sid = vio_send_sid(vio);
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if (pkt->xfer_mode != VIO_DRING_MODE ||
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pkt->addr_type != VNET_ADDR_ETHERMAC ||
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pkt->mtu != ETH_FRAME_LEN) {
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viodbg(HS, "SEND NET ATTR NACK\n");
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pkt->tag.stype = VIO_SUBTYPE_NACK;
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(void) vio_ldc_send(vio, pkt, sizeof(*pkt));
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return -ECONNRESET;
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} else {
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viodbg(HS, "SEND NET ATTR ACK\n");
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pkt->tag.stype = VIO_SUBTYPE_ACK;
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return vio_ldc_send(vio, pkt, sizeof(*pkt));
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}
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}
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static int handle_attr_ack(struct vio_driver_state *vio,
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struct vio_net_attr_info *pkt)
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{
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viodbg(HS, "GOT NET ATTR ACK\n");
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return 0;
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}
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static int handle_attr_nack(struct vio_driver_state *vio,
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struct vio_net_attr_info *pkt)
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{
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viodbg(HS, "GOT NET ATTR NACK\n");
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return -ECONNRESET;
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}
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static int vnet_handle_attr(struct vio_driver_state *vio, void *arg)
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{
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struct vio_net_attr_info *pkt = arg;
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switch (pkt->tag.stype) {
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case VIO_SUBTYPE_INFO:
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return handle_attr_info(vio, pkt);
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case VIO_SUBTYPE_ACK:
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return handle_attr_ack(vio, pkt);
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case VIO_SUBTYPE_NACK:
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return handle_attr_nack(vio, pkt);
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default:
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return -ECONNRESET;
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}
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}
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static void vnet_handshake_complete(struct vio_driver_state *vio)
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{
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struct vio_dring_state *dr;
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dr = &vio->drings[VIO_DRIVER_RX_RING];
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dr->snd_nxt = dr->rcv_nxt = 1;
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dr = &vio->drings[VIO_DRIVER_TX_RING];
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dr->snd_nxt = dr->rcv_nxt = 1;
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}
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/* The hypervisor interface that implements copying to/from imported
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* memory from another domain requires that copies are done to 8-byte
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* aligned buffers, and that the lengths of such copies are also 8-byte
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* multiples.
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*
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* So we align skb->data to an 8-byte multiple and pad-out the data
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* area so we can round the copy length up to the next multiple of
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* 8 for the copy.
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*
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* The transmitter puts the actual start of the packet 6 bytes into
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* the buffer it sends over, so that the IP headers after the ethernet
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* header are aligned properly. These 6 bytes are not in the descriptor
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* length, they are simply implied. This offset is represented using
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* the VNET_PACKET_SKIP macro.
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*/
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static struct sk_buff *alloc_and_align_skb(struct net_device *dev,
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unsigned int len)
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{
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struct sk_buff *skb = netdev_alloc_skb(dev, len+VNET_PACKET_SKIP+8+8);
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unsigned long addr, off;
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if (unlikely(!skb))
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return NULL;
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addr = (unsigned long) skb->data;
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off = ((addr + 7UL) & ~7UL) - addr;
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if (off)
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skb_reserve(skb, off);
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return skb;
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}
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static int vnet_rx_one(struct vnet_port *port, unsigned int len,
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struct ldc_trans_cookie *cookies, int ncookies)
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{
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struct net_device *dev = port->vp->dev;
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unsigned int copy_len;
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struct sk_buff *skb;
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int err;
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err = -EMSGSIZE;
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if (unlikely(len < ETH_ZLEN || len > ETH_FRAME_LEN)) {
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dev->stats.rx_length_errors++;
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goto out_dropped;
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}
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skb = alloc_and_align_skb(dev, len);
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err = -ENOMEM;
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if (unlikely(!skb)) {
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dev->stats.rx_missed_errors++;
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goto out_dropped;
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}
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copy_len = (len + VNET_PACKET_SKIP + 7U) & ~7U;
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skb_put(skb, copy_len);
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err = ldc_copy(port->vio.lp, LDC_COPY_IN,
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skb->data, copy_len, 0,
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cookies, ncookies);
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if (unlikely(err < 0)) {
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dev->stats.rx_frame_errors++;
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goto out_free_skb;
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}
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skb_pull(skb, VNET_PACKET_SKIP);
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skb_trim(skb, len);
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skb->protocol = eth_type_trans(skb, dev);
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dev->stats.rx_packets++;
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dev->stats.rx_bytes += len;
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netif_rx(skb);
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return 0;
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out_free_skb:
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kfree_skb(skb);
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out_dropped:
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dev->stats.rx_dropped++;
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return err;
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}
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static int vnet_send_ack(struct vnet_port *port, struct vio_dring_state *dr,
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u32 start, u32 end, u8 vio_dring_state)
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{
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struct vio_dring_data hdr = {
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.tag = {
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.type = VIO_TYPE_DATA,
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.stype = VIO_SUBTYPE_ACK,
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.stype_env = VIO_DRING_DATA,
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.sid = vio_send_sid(&port->vio),
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},
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.dring_ident = dr->ident,
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.start_idx = start,
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.end_idx = end,
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.state = vio_dring_state,
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};
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int err, delay;
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hdr.seq = dr->snd_nxt;
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delay = 1;
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do {
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err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
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if (err > 0) {
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dr->snd_nxt++;
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break;
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}
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udelay(delay);
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if ((delay <<= 1) > 128)
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delay = 128;
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} while (err == -EAGAIN);
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return err;
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}
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static u32 next_idx(u32 idx, struct vio_dring_state *dr)
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{
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if (++idx == dr->num_entries)
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idx = 0;
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return idx;
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}
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static u32 prev_idx(u32 idx, struct vio_dring_state *dr)
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{
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if (idx == 0)
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idx = dr->num_entries - 1;
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else
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idx--;
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return idx;
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}
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static struct vio_net_desc *get_rx_desc(struct vnet_port *port,
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struct vio_dring_state *dr,
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u32 index)
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{
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struct vio_net_desc *desc = port->vio.desc_buf;
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int err;
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err = ldc_get_dring_entry(port->vio.lp, desc, dr->entry_size,
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(index * dr->entry_size),
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dr->cookies, dr->ncookies);
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if (err < 0)
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return ERR_PTR(err);
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return desc;
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}
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static int put_rx_desc(struct vnet_port *port,
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struct vio_dring_state *dr,
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struct vio_net_desc *desc,
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u32 index)
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{
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int err;
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err = ldc_put_dring_entry(port->vio.lp, desc, dr->entry_size,
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(index * dr->entry_size),
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dr->cookies, dr->ncookies);
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if (err < 0)
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return err;
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return 0;
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}
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static int vnet_walk_rx_one(struct vnet_port *port,
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struct vio_dring_state *dr,
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u32 index, int *needs_ack)
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{
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struct vio_net_desc *desc = get_rx_desc(port, dr, index);
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struct vio_driver_state *vio = &port->vio;
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int err;
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if (IS_ERR(desc))
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return PTR_ERR(desc);
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viodbg(DATA, "vio_walk_rx_one desc[%02x:%02x:%08x:%08x:%llx:%llx]\n",
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desc->hdr.state, desc->hdr.ack,
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desc->size, desc->ncookies,
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desc->cookies[0].cookie_addr,
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desc->cookies[0].cookie_size);
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if (desc->hdr.state != VIO_DESC_READY)
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return 1;
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err = vnet_rx_one(port, desc->size, desc->cookies, desc->ncookies);
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if (err == -ECONNRESET)
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return err;
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desc->hdr.state = VIO_DESC_DONE;
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err = put_rx_desc(port, dr, desc, index);
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if (err < 0)
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return err;
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*needs_ack = desc->hdr.ack;
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return 0;
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}
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static int vnet_walk_rx(struct vnet_port *port, struct vio_dring_state *dr,
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u32 start, u32 end)
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{
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struct vio_driver_state *vio = &port->vio;
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int ack_start = -1, ack_end = -1;
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end = (end == (u32) -1) ? prev_idx(start, dr) : next_idx(end, dr);
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viodbg(DATA, "vnet_walk_rx start[%08x] end[%08x]\n", start, end);
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while (start != end) {
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int ack = 0, err = vnet_walk_rx_one(port, dr, start, &ack);
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if (err == -ECONNRESET)
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return err;
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if (err != 0)
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break;
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if (ack_start == -1)
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ack_start = start;
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ack_end = start;
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start = next_idx(start, dr);
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if (ack && start != end) {
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err = vnet_send_ack(port, dr, ack_start, ack_end,
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VIO_DRING_ACTIVE);
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if (err == -ECONNRESET)
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return err;
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ack_start = -1;
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}
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}
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if (unlikely(ack_start == -1))
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ack_start = ack_end = prev_idx(start, dr);
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return vnet_send_ack(port, dr, ack_start, ack_end, VIO_DRING_STOPPED);
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}
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static int vnet_rx(struct vnet_port *port, void *msgbuf)
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{
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struct vio_dring_data *pkt = msgbuf;
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struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_RX_RING];
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struct vio_driver_state *vio = &port->vio;
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viodbg(DATA, "vnet_rx stype_env[%04x] seq[%016llx] rcv_nxt[%016llx]\n",
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pkt->tag.stype_env, pkt->seq, dr->rcv_nxt);
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if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
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return 0;
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if (unlikely(pkt->seq != dr->rcv_nxt)) {
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printk(KERN_ERR PFX "RX out of sequence seq[0x%llx] "
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"rcv_nxt[0x%llx]\n", pkt->seq, dr->rcv_nxt);
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return 0;
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}
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dr->rcv_nxt++;
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/* XXX Validate pkt->start_idx and pkt->end_idx XXX */
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return vnet_walk_rx(port, dr, pkt->start_idx, pkt->end_idx);
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}
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static int idx_is_pending(struct vio_dring_state *dr, u32 end)
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{
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u32 idx = dr->cons;
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int found = 0;
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while (idx != dr->prod) {
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if (idx == end) {
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found = 1;
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break;
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}
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idx = next_idx(idx, dr);
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}
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return found;
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}
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static int vnet_ack(struct vnet_port *port, void *msgbuf)
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{
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struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
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struct vio_dring_data *pkt = msgbuf;
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struct net_device *dev;
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struct vnet *vp;
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u32 end;
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if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
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return 0;
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end = pkt->end_idx;
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if (unlikely(!idx_is_pending(dr, end)))
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return 0;
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|
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dr->cons = next_idx(end, dr);
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|
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vp = port->vp;
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dev = vp->dev;
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if (unlikely(netif_queue_stopped(dev) &&
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vnet_tx_dring_avail(dr) >= VNET_TX_WAKEUP_THRESH(dr)))
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return 1;
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|
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return 0;
|
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}
|
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|
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static int vnet_nack(struct vnet_port *port, void *msgbuf)
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{
|
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/* XXX just reset or similar XXX */
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return 0;
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}
|
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|
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static int handle_mcast(struct vnet_port *port, void *msgbuf)
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{
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struct vio_net_mcast_info *pkt = msgbuf;
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|
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if (pkt->tag.stype != VIO_SUBTYPE_ACK)
|
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printk(KERN_ERR PFX "%s: Got unexpected MCAST reply "
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"[%02x:%02x:%04x:%08x]\n",
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port->vp->dev->name,
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pkt->tag.type,
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pkt->tag.stype,
|
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pkt->tag.stype_env,
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pkt->tag.sid);
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return 0;
|
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}
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|
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static void maybe_tx_wakeup(struct vnet *vp)
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{
|
|
struct net_device *dev = vp->dev;
|
|
|
|
netif_tx_lock(dev);
|
|
if (likely(netif_queue_stopped(dev))) {
|
|
struct vnet_port *port;
|
|
int wake = 1;
|
|
|
|
list_for_each_entry(port, &vp->port_list, list) {
|
|
struct vio_dring_state *dr;
|
|
|
|
dr = &port->vio.drings[VIO_DRIVER_TX_RING];
|
|
if (vnet_tx_dring_avail(dr) <
|
|
VNET_TX_WAKEUP_THRESH(dr)) {
|
|
wake = 0;
|
|
break;
|
|
}
|
|
}
|
|
if (wake)
|
|
netif_wake_queue(dev);
|
|
}
|
|
netif_tx_unlock(dev);
|
|
}
|
|
|
|
static void vnet_event(void *arg, int event)
|
|
{
|
|
struct vnet_port *port = arg;
|
|
struct vio_driver_state *vio = &port->vio;
|
|
unsigned long flags;
|
|
int tx_wakeup, err;
|
|
|
|
spin_lock_irqsave(&vio->lock, flags);
|
|
|
|
if (unlikely(event == LDC_EVENT_RESET ||
|
|
event == LDC_EVENT_UP)) {
|
|
vio_link_state_change(vio, event);
|
|
spin_unlock_irqrestore(&vio->lock, flags);
|
|
|
|
if (event == LDC_EVENT_RESET)
|
|
vio_port_up(vio);
|
|
return;
|
|
}
|
|
|
|
if (unlikely(event != LDC_EVENT_DATA_READY)) {
|
|
printk(KERN_WARNING PFX "Unexpected LDC event %d\n", event);
|
|
spin_unlock_irqrestore(&vio->lock, flags);
|
|
return;
|
|
}
|
|
|
|
tx_wakeup = err = 0;
|
|
while (1) {
|
|
union {
|
|
struct vio_msg_tag tag;
|
|
u64 raw[8];
|
|
} msgbuf;
|
|
|
|
err = ldc_read(vio->lp, &msgbuf, sizeof(msgbuf));
|
|
if (unlikely(err < 0)) {
|
|
if (err == -ECONNRESET)
|
|
vio_conn_reset(vio);
|
|
break;
|
|
}
|
|
if (err == 0)
|
|
break;
|
|
viodbg(DATA, "TAG [%02x:%02x:%04x:%08x]\n",
|
|
msgbuf.tag.type,
|
|
msgbuf.tag.stype,
|
|
msgbuf.tag.stype_env,
|
|
msgbuf.tag.sid);
|
|
err = vio_validate_sid(vio, &msgbuf.tag);
|
|
if (err < 0)
|
|
break;
|
|
|
|
if (likely(msgbuf.tag.type == VIO_TYPE_DATA)) {
|
|
if (msgbuf.tag.stype == VIO_SUBTYPE_INFO) {
|
|
err = vnet_rx(port, &msgbuf);
|
|
} else if (msgbuf.tag.stype == VIO_SUBTYPE_ACK) {
|
|
err = vnet_ack(port, &msgbuf);
|
|
if (err > 0)
|
|
tx_wakeup |= err;
|
|
} else if (msgbuf.tag.stype == VIO_SUBTYPE_NACK) {
|
|
err = vnet_nack(port, &msgbuf);
|
|
}
|
|
} else if (msgbuf.tag.type == VIO_TYPE_CTRL) {
|
|
if (msgbuf.tag.stype_env == VNET_MCAST_INFO)
|
|
err = handle_mcast(port, &msgbuf);
|
|
else
|
|
err = vio_control_pkt_engine(vio, &msgbuf);
|
|
if (err)
|
|
break;
|
|
} else {
|
|
err = vnet_handle_unknown(port, &msgbuf);
|
|
}
|
|
if (err == -ECONNRESET)
|
|
break;
|
|
}
|
|
spin_unlock(&vio->lock);
|
|
if (unlikely(tx_wakeup && err != -ECONNRESET))
|
|
maybe_tx_wakeup(port->vp);
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
static int __vnet_tx_trigger(struct vnet_port *port)
|
|
{
|
|
struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
|
|
struct vio_dring_data hdr = {
|
|
.tag = {
|
|
.type = VIO_TYPE_DATA,
|
|
.stype = VIO_SUBTYPE_INFO,
|
|
.stype_env = VIO_DRING_DATA,
|
|
.sid = vio_send_sid(&port->vio),
|
|
},
|
|
.dring_ident = dr->ident,
|
|
.start_idx = dr->prod,
|
|
.end_idx = (u32) -1,
|
|
};
|
|
int err, delay;
|
|
|
|
hdr.seq = dr->snd_nxt;
|
|
delay = 1;
|
|
do {
|
|
err = vio_ldc_send(&port->vio, &hdr, sizeof(hdr));
|
|
if (err > 0) {
|
|
dr->snd_nxt++;
|
|
break;
|
|
}
|
|
udelay(delay);
|
|
if ((delay <<= 1) > 128)
|
|
delay = 128;
|
|
} while (err == -EAGAIN);
|
|
|
|
return err;
|
|
}
|
|
|
|
struct vnet_port *__tx_port_find(struct vnet *vp, struct sk_buff *skb)
|
|
{
|
|
unsigned int hash = vnet_hashfn(skb->data);
|
|
struct hlist_head *hp = &vp->port_hash[hash];
|
|
struct hlist_node *n;
|
|
struct vnet_port *port;
|
|
|
|
hlist_for_each_entry(port, n, hp, hash) {
|
|
if (!compare_ether_addr(port->raddr, skb->data))
|
|
return port;
|
|
}
|
|
port = NULL;
|
|
if (!list_empty(&vp->port_list))
|
|
port = list_entry(vp->port_list.next, struct vnet_port, list);
|
|
|
|
return port;
|
|
}
|
|
|
|
struct vnet_port *tx_port_find(struct vnet *vp, struct sk_buff *skb)
|
|
{
|
|
struct vnet_port *ret;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&vp->lock, flags);
|
|
ret = __tx_port_find(vp, skb);
|
|
spin_unlock_irqrestore(&vp->lock, flags);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev)
|
|
{
|
|
struct vnet *vp = netdev_priv(dev);
|
|
struct vnet_port *port = tx_port_find(vp, skb);
|
|
struct vio_dring_state *dr;
|
|
struct vio_net_desc *d;
|
|
unsigned long flags;
|
|
unsigned int len;
|
|
void *tx_buf;
|
|
int i, err;
|
|
|
|
if (unlikely(!port))
|
|
goto out_dropped;
|
|
|
|
spin_lock_irqsave(&port->vio.lock, flags);
|
|
|
|
dr = &port->vio.drings[VIO_DRIVER_TX_RING];
|
|
if (unlikely(vnet_tx_dring_avail(dr) < 2)) {
|
|
if (!netif_queue_stopped(dev)) {
|
|
netif_stop_queue(dev);
|
|
|
|
/* This is a hard error, log it. */
|
|
printk(KERN_ERR PFX "%s: BUG! Tx Ring full when "
|
|
"queue awake!\n", dev->name);
|
|
dev->stats.tx_errors++;
|
|
}
|
|
spin_unlock_irqrestore(&port->vio.lock, flags);
|
|
return NETDEV_TX_BUSY;
|
|
}
|
|
|
|
d = vio_dring_cur(dr);
|
|
|
|
tx_buf = port->tx_bufs[dr->prod].buf;
|
|
skb_copy_from_linear_data(skb, tx_buf + VNET_PACKET_SKIP, skb->len);
|
|
|
|
len = skb->len;
|
|
if (len < ETH_ZLEN) {
|
|
len = ETH_ZLEN;
|
|
memset(tx_buf+VNET_PACKET_SKIP+skb->len, 0, len - skb->len);
|
|
}
|
|
|
|
d->hdr.ack = VIO_ACK_ENABLE;
|
|
d->size = len;
|
|
d->ncookies = port->tx_bufs[dr->prod].ncookies;
|
|
for (i = 0; i < d->ncookies; i++)
|
|
d->cookies[i] = port->tx_bufs[dr->prod].cookies[i];
|
|
|
|
/* This has to be a non-SMP write barrier because we are writing
|
|
* to memory which is shared with the peer LDOM.
|
|
*/
|
|
wmb();
|
|
|
|
d->hdr.state = VIO_DESC_READY;
|
|
|
|
err = __vnet_tx_trigger(port);
|
|
if (unlikely(err < 0)) {
|
|
printk(KERN_INFO PFX "%s: TX trigger error %d\n",
|
|
dev->name, err);
|
|
d->hdr.state = VIO_DESC_FREE;
|
|
dev->stats.tx_carrier_errors++;
|
|
goto out_dropped_unlock;
|
|
}
|
|
|
|
dev->stats.tx_packets++;
|
|
dev->stats.tx_bytes += skb->len;
|
|
|
|
dr->prod = (dr->prod + 1) & (VNET_TX_RING_SIZE - 1);
|
|
if (unlikely(vnet_tx_dring_avail(dr) < 2)) {
|
|
netif_stop_queue(dev);
|
|
if (vnet_tx_dring_avail(dr) > VNET_TX_WAKEUP_THRESH(dr))
|
|
netif_wake_queue(dev);
|
|
}
|
|
|
|
spin_unlock_irqrestore(&port->vio.lock, flags);
|
|
|
|
dev_kfree_skb(skb);
|
|
|
|
dev->trans_start = jiffies;
|
|
return NETDEV_TX_OK;
|
|
|
|
out_dropped_unlock:
|
|
spin_unlock_irqrestore(&port->vio.lock, flags);
|
|
|
|
out_dropped:
|
|
dev_kfree_skb(skb);
|
|
dev->stats.tx_dropped++;
|
|
return NETDEV_TX_OK;
|
|
}
|
|
|
|
static void vnet_tx_timeout(struct net_device *dev)
|
|
{
|
|
/* XXX Implement me XXX */
|
|
}
|
|
|
|
static int vnet_open(struct net_device *dev)
|
|
{
|
|
netif_carrier_on(dev);
|
|
netif_start_queue(dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vnet_close(struct net_device *dev)
|
|
{
|
|
netif_stop_queue(dev);
|
|
netif_carrier_off(dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct vnet_mcast_entry *__vnet_mc_find(struct vnet *vp, u8 *addr)
|
|
{
|
|
struct vnet_mcast_entry *m;
|
|
|
|
for (m = vp->mcast_list; m; m = m->next) {
|
|
if (!memcmp(m->addr, addr, ETH_ALEN))
|
|
return m;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static void __update_mc_list(struct vnet *vp, struct net_device *dev)
|
|
{
|
|
struct dev_addr_list *p;
|
|
|
|
for (p = dev->mc_list; p; p = p->next) {
|
|
struct vnet_mcast_entry *m;
|
|
|
|
m = __vnet_mc_find(vp, p->dmi_addr);
|
|
if (m) {
|
|
m->hit = 1;
|
|
continue;
|
|
}
|
|
|
|
if (!m) {
|
|
m = kzalloc(sizeof(*m), GFP_ATOMIC);
|
|
if (!m)
|
|
continue;
|
|
memcpy(m->addr, p->dmi_addr, ETH_ALEN);
|
|
m->hit = 1;
|
|
|
|
m->next = vp->mcast_list;
|
|
vp->mcast_list = m;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void __send_mc_list(struct vnet *vp, struct vnet_port *port)
|
|
{
|
|
struct vio_net_mcast_info info;
|
|
struct vnet_mcast_entry *m, **pp;
|
|
int n_addrs;
|
|
|
|
memset(&info, 0, sizeof(info));
|
|
|
|
info.tag.type = VIO_TYPE_CTRL;
|
|
info.tag.stype = VIO_SUBTYPE_INFO;
|
|
info.tag.stype_env = VNET_MCAST_INFO;
|
|
info.tag.sid = vio_send_sid(&port->vio);
|
|
info.set = 1;
|
|
|
|
n_addrs = 0;
|
|
for (m = vp->mcast_list; m; m = m->next) {
|
|
if (m->sent)
|
|
continue;
|
|
m->sent = 1;
|
|
memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
|
|
m->addr, ETH_ALEN);
|
|
if (++n_addrs == VNET_NUM_MCAST) {
|
|
info.count = n_addrs;
|
|
|
|
(void) vio_ldc_send(&port->vio, &info,
|
|
sizeof(info));
|
|
n_addrs = 0;
|
|
}
|
|
}
|
|
if (n_addrs) {
|
|
info.count = n_addrs;
|
|
(void) vio_ldc_send(&port->vio, &info, sizeof(info));
|
|
}
|
|
|
|
info.set = 0;
|
|
|
|
n_addrs = 0;
|
|
pp = &vp->mcast_list;
|
|
while ((m = *pp) != NULL) {
|
|
if (m->hit) {
|
|
m->hit = 0;
|
|
pp = &m->next;
|
|
continue;
|
|
}
|
|
|
|
memcpy(&info.mcast_addr[n_addrs * ETH_ALEN],
|
|
m->addr, ETH_ALEN);
|
|
if (++n_addrs == VNET_NUM_MCAST) {
|
|
info.count = n_addrs;
|
|
(void) vio_ldc_send(&port->vio, &info,
|
|
sizeof(info));
|
|
n_addrs = 0;
|
|
}
|
|
|
|
*pp = m->next;
|
|
kfree(m);
|
|
}
|
|
if (n_addrs) {
|
|
info.count = n_addrs;
|
|
(void) vio_ldc_send(&port->vio, &info, sizeof(info));
|
|
}
|
|
}
|
|
|
|
static void vnet_set_rx_mode(struct net_device *dev)
|
|
{
|
|
struct vnet *vp = netdev_priv(dev);
|
|
struct vnet_port *port;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&vp->lock, flags);
|
|
if (!list_empty(&vp->port_list)) {
|
|
port = list_entry(vp->port_list.next, struct vnet_port, list);
|
|
|
|
if (port->switch_port) {
|
|
__update_mc_list(vp, dev);
|
|
__send_mc_list(vp, port);
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&vp->lock, flags);
|
|
}
|
|
|
|
static int vnet_change_mtu(struct net_device *dev, int new_mtu)
|
|
{
|
|
if (new_mtu != ETH_DATA_LEN)
|
|
return -EINVAL;
|
|
|
|
dev->mtu = new_mtu;
|
|
return 0;
|
|
}
|
|
|
|
static int vnet_set_mac_addr(struct net_device *dev, void *p)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
|
|
static void vnet_get_drvinfo(struct net_device *dev,
|
|
struct ethtool_drvinfo *info)
|
|
{
|
|
strcpy(info->driver, DRV_MODULE_NAME);
|
|
strcpy(info->version, DRV_MODULE_VERSION);
|
|
}
|
|
|
|
static u32 vnet_get_msglevel(struct net_device *dev)
|
|
{
|
|
struct vnet *vp = netdev_priv(dev);
|
|
return vp->msg_enable;
|
|
}
|
|
|
|
static void vnet_set_msglevel(struct net_device *dev, u32 value)
|
|
{
|
|
struct vnet *vp = netdev_priv(dev);
|
|
vp->msg_enable = value;
|
|
}
|
|
|
|
static const struct ethtool_ops vnet_ethtool_ops = {
|
|
.get_drvinfo = vnet_get_drvinfo,
|
|
.get_msglevel = vnet_get_msglevel,
|
|
.set_msglevel = vnet_set_msglevel,
|
|
.get_link = ethtool_op_get_link,
|
|
};
|
|
|
|
static void vnet_port_free_tx_bufs(struct vnet_port *port)
|
|
{
|
|
struct vio_dring_state *dr;
|
|
int i;
|
|
|
|
dr = &port->vio.drings[VIO_DRIVER_TX_RING];
|
|
if (dr->base) {
|
|
ldc_free_exp_dring(port->vio.lp, dr->base,
|
|
(dr->entry_size * dr->num_entries),
|
|
dr->cookies, dr->ncookies);
|
|
dr->base = NULL;
|
|
dr->entry_size = 0;
|
|
dr->num_entries = 0;
|
|
dr->pending = 0;
|
|
dr->ncookies = 0;
|
|
}
|
|
|
|
for (i = 0; i < VNET_TX_RING_SIZE; i++) {
|
|
void *buf = port->tx_bufs[i].buf;
|
|
|
|
if (!buf)
|
|
continue;
|
|
|
|
ldc_unmap(port->vio.lp,
|
|
port->tx_bufs[i].cookies,
|
|
port->tx_bufs[i].ncookies);
|
|
|
|
kfree(buf);
|
|
port->tx_bufs[i].buf = NULL;
|
|
}
|
|
}
|
|
|
|
static int __devinit vnet_port_alloc_tx_bufs(struct vnet_port *port)
|
|
{
|
|
struct vio_dring_state *dr;
|
|
unsigned long len;
|
|
int i, err, ncookies;
|
|
void *dring;
|
|
|
|
for (i = 0; i < VNET_TX_RING_SIZE; i++) {
|
|
void *buf = kzalloc(ETH_FRAME_LEN + 8, GFP_KERNEL);
|
|
int map_len = (ETH_FRAME_LEN + 7) & ~7;
|
|
|
|
err = -ENOMEM;
|
|
if (!buf) {
|
|
printk(KERN_ERR "TX buffer allocation failure\n");
|
|
goto err_out;
|
|
}
|
|
err = -EFAULT;
|
|
if ((unsigned long)buf & (8UL - 1)) {
|
|
printk(KERN_ERR "TX buffer misaligned\n");
|
|
kfree(buf);
|
|
goto err_out;
|
|
}
|
|
|
|
err = ldc_map_single(port->vio.lp, buf, map_len,
|
|
port->tx_bufs[i].cookies, 2,
|
|
(LDC_MAP_SHADOW |
|
|
LDC_MAP_DIRECT |
|
|
LDC_MAP_RW));
|
|
if (err < 0) {
|
|
kfree(buf);
|
|
goto err_out;
|
|
}
|
|
port->tx_bufs[i].buf = buf;
|
|
port->tx_bufs[i].ncookies = err;
|
|
}
|
|
|
|
dr = &port->vio.drings[VIO_DRIVER_TX_RING];
|
|
|
|
len = (VNET_TX_RING_SIZE *
|
|
(sizeof(struct vio_net_desc) +
|
|
(sizeof(struct ldc_trans_cookie) * 2)));
|
|
|
|
ncookies = VIO_MAX_RING_COOKIES;
|
|
dring = ldc_alloc_exp_dring(port->vio.lp, len,
|
|
dr->cookies, &ncookies,
|
|
(LDC_MAP_SHADOW |
|
|
LDC_MAP_DIRECT |
|
|
LDC_MAP_RW));
|
|
if (IS_ERR(dring)) {
|
|
err = PTR_ERR(dring);
|
|
goto err_out;
|
|
}
|
|
|
|
dr->base = dring;
|
|
dr->entry_size = (sizeof(struct vio_net_desc) +
|
|
(sizeof(struct ldc_trans_cookie) * 2));
|
|
dr->num_entries = VNET_TX_RING_SIZE;
|
|
dr->prod = dr->cons = 0;
|
|
dr->pending = VNET_TX_RING_SIZE;
|
|
dr->ncookies = ncookies;
|
|
|
|
return 0;
|
|
|
|
err_out:
|
|
vnet_port_free_tx_bufs(port);
|
|
|
|
return err;
|
|
}
|
|
|
|
static LIST_HEAD(vnet_list);
|
|
static DEFINE_MUTEX(vnet_list_mutex);
|
|
|
|
static const struct net_device_ops vnet_ops = {
|
|
.ndo_open = vnet_open,
|
|
.ndo_stop = vnet_close,
|
|
.ndo_set_multicast_list = vnet_set_rx_mode,
|
|
.ndo_set_mac_address = vnet_set_mac_addr,
|
|
.ndo_validate_addr = eth_validate_addr,
|
|
.ndo_tx_timeout = vnet_tx_timeout,
|
|
.ndo_change_mtu = vnet_change_mtu,
|
|
.ndo_start_xmit = vnet_start_xmit,
|
|
};
|
|
|
|
static struct vnet * __devinit vnet_new(const u64 *local_mac)
|
|
{
|
|
struct net_device *dev;
|
|
struct vnet *vp;
|
|
int err, i;
|
|
|
|
dev = alloc_etherdev(sizeof(*vp));
|
|
if (!dev) {
|
|
printk(KERN_ERR PFX "Etherdev alloc failed, aborting.\n");
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
for (i = 0; i < ETH_ALEN; i++)
|
|
dev->dev_addr[i] = (*local_mac >> (5 - i) * 8) & 0xff;
|
|
|
|
memcpy(dev->perm_addr, dev->dev_addr, dev->addr_len);
|
|
|
|
vp = netdev_priv(dev);
|
|
|
|
spin_lock_init(&vp->lock);
|
|
vp->dev = dev;
|
|
|
|
INIT_LIST_HEAD(&vp->port_list);
|
|
for (i = 0; i < VNET_PORT_HASH_SIZE; i++)
|
|
INIT_HLIST_HEAD(&vp->port_hash[i]);
|
|
INIT_LIST_HEAD(&vp->list);
|
|
vp->local_mac = *local_mac;
|
|
|
|
dev->netdev_ops = &vnet_ops;
|
|
dev->ethtool_ops = &vnet_ethtool_ops;
|
|
dev->watchdog_timeo = VNET_TX_TIMEOUT;
|
|
|
|
err = register_netdev(dev);
|
|
if (err) {
|
|
printk(KERN_ERR PFX "Cannot register net device, "
|
|
"aborting.\n");
|
|
goto err_out_free_dev;
|
|
}
|
|
|
|
printk(KERN_INFO "%s: Sun LDOM vnet ", dev->name);
|
|
|
|
for (i = 0; i < 6; i++)
|
|
printk("%2.2x%c", dev->dev_addr[i], i == 5 ? '\n' : ':');
|
|
|
|
list_add(&vp->list, &vnet_list);
|
|
|
|
return vp;
|
|
|
|
err_out_free_dev:
|
|
free_netdev(dev);
|
|
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
static struct vnet * __devinit vnet_find_or_create(const u64 *local_mac)
|
|
{
|
|
struct vnet *iter, *vp;
|
|
|
|
mutex_lock(&vnet_list_mutex);
|
|
vp = NULL;
|
|
list_for_each_entry(iter, &vnet_list, list) {
|
|
if (iter->local_mac == *local_mac) {
|
|
vp = iter;
|
|
break;
|
|
}
|
|
}
|
|
if (!vp)
|
|
vp = vnet_new(local_mac);
|
|
mutex_unlock(&vnet_list_mutex);
|
|
|
|
return vp;
|
|
}
|
|
|
|
static const char *local_mac_prop = "local-mac-address";
|
|
|
|
static struct vnet * __devinit vnet_find_parent(struct mdesc_handle *hp,
|
|
u64 port_node)
|
|
{
|
|
const u64 *local_mac = NULL;
|
|
u64 a;
|
|
|
|
mdesc_for_each_arc(a, hp, port_node, MDESC_ARC_TYPE_BACK) {
|
|
u64 target = mdesc_arc_target(hp, a);
|
|
const char *name;
|
|
|
|
name = mdesc_get_property(hp, target, "name", NULL);
|
|
if (!name || strcmp(name, "network"))
|
|
continue;
|
|
|
|
local_mac = mdesc_get_property(hp, target,
|
|
local_mac_prop, NULL);
|
|
if (local_mac)
|
|
break;
|
|
}
|
|
if (!local_mac)
|
|
return ERR_PTR(-ENODEV);
|
|
|
|
return vnet_find_or_create(local_mac);
|
|
}
|
|
|
|
static struct ldc_channel_config vnet_ldc_cfg = {
|
|
.event = vnet_event,
|
|
.mtu = 64,
|
|
.mode = LDC_MODE_UNRELIABLE,
|
|
};
|
|
|
|
static struct vio_driver_ops vnet_vio_ops = {
|
|
.send_attr = vnet_send_attr,
|
|
.handle_attr = vnet_handle_attr,
|
|
.handshake_complete = vnet_handshake_complete,
|
|
};
|
|
|
|
static void __devinit print_version(void)
|
|
{
|
|
static int version_printed;
|
|
|
|
if (version_printed++ == 0)
|
|
printk(KERN_INFO "%s", version);
|
|
}
|
|
|
|
const char *remote_macaddr_prop = "remote-mac-address";
|
|
|
|
static int __devinit vnet_port_probe(struct vio_dev *vdev,
|
|
const struct vio_device_id *id)
|
|
{
|
|
struct mdesc_handle *hp;
|
|
struct vnet_port *port;
|
|
unsigned long flags;
|
|
struct vnet *vp;
|
|
const u64 *rmac;
|
|
int len, i, err, switch_port;
|
|
|
|
print_version();
|
|
|
|
hp = mdesc_grab();
|
|
|
|
vp = vnet_find_parent(hp, vdev->mp);
|
|
if (IS_ERR(vp)) {
|
|
printk(KERN_ERR PFX "Cannot find port parent vnet.\n");
|
|
err = PTR_ERR(vp);
|
|
goto err_out_put_mdesc;
|
|
}
|
|
|
|
rmac = mdesc_get_property(hp, vdev->mp, remote_macaddr_prop, &len);
|
|
err = -ENODEV;
|
|
if (!rmac) {
|
|
printk(KERN_ERR PFX "Port lacks %s property.\n",
|
|
remote_macaddr_prop);
|
|
goto err_out_put_mdesc;
|
|
}
|
|
|
|
port = kzalloc(sizeof(*port), GFP_KERNEL);
|
|
err = -ENOMEM;
|
|
if (!port) {
|
|
printk(KERN_ERR PFX "Cannot allocate vnet_port.\n");
|
|
goto err_out_put_mdesc;
|
|
}
|
|
|
|
for (i = 0; i < ETH_ALEN; i++)
|
|
port->raddr[i] = (*rmac >> (5 - i) * 8) & 0xff;
|
|
|
|
port->vp = vp;
|
|
|
|
err = vio_driver_init(&port->vio, vdev, VDEV_NETWORK,
|
|
vnet_versions, ARRAY_SIZE(vnet_versions),
|
|
&vnet_vio_ops, vp->dev->name);
|
|
if (err)
|
|
goto err_out_free_port;
|
|
|
|
err = vio_ldc_alloc(&port->vio, &vnet_ldc_cfg, port);
|
|
if (err)
|
|
goto err_out_free_port;
|
|
|
|
err = vnet_port_alloc_tx_bufs(port);
|
|
if (err)
|
|
goto err_out_free_ldc;
|
|
|
|
INIT_HLIST_NODE(&port->hash);
|
|
INIT_LIST_HEAD(&port->list);
|
|
|
|
switch_port = 0;
|
|
if (mdesc_get_property(hp, vdev->mp, "switch-port", NULL) != NULL)
|
|
switch_port = 1;
|
|
port->switch_port = switch_port;
|
|
|
|
spin_lock_irqsave(&vp->lock, flags);
|
|
if (switch_port)
|
|
list_add(&port->list, &vp->port_list);
|
|
else
|
|
list_add_tail(&port->list, &vp->port_list);
|
|
hlist_add_head(&port->hash, &vp->port_hash[vnet_hashfn(port->raddr)]);
|
|
spin_unlock_irqrestore(&vp->lock, flags);
|
|
|
|
dev_set_drvdata(&vdev->dev, port);
|
|
|
|
printk(KERN_INFO "%s: PORT ( remote-mac %pM%s )\n",
|
|
vp->dev->name, port->raddr,
|
|
switch_port ? " switch-port" : "");
|
|
|
|
vio_port_up(&port->vio);
|
|
|
|
mdesc_release(hp);
|
|
|
|
return 0;
|
|
|
|
err_out_free_ldc:
|
|
vio_ldc_free(&port->vio);
|
|
|
|
err_out_free_port:
|
|
kfree(port);
|
|
|
|
err_out_put_mdesc:
|
|
mdesc_release(hp);
|
|
return err;
|
|
}
|
|
|
|
static int vnet_port_remove(struct vio_dev *vdev)
|
|
{
|
|
struct vnet_port *port = dev_get_drvdata(&vdev->dev);
|
|
|
|
if (port) {
|
|
struct vnet *vp = port->vp;
|
|
unsigned long flags;
|
|
|
|
del_timer_sync(&port->vio.timer);
|
|
|
|
spin_lock_irqsave(&vp->lock, flags);
|
|
list_del(&port->list);
|
|
hlist_del(&port->hash);
|
|
spin_unlock_irqrestore(&vp->lock, flags);
|
|
|
|
vnet_port_free_tx_bufs(port);
|
|
vio_ldc_free(&port->vio);
|
|
|
|
dev_set_drvdata(&vdev->dev, NULL);
|
|
|
|
kfree(port);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static const struct vio_device_id vnet_port_match[] = {
|
|
{
|
|
.type = "vnet-port",
|
|
},
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(vio, vnet_port_match);
|
|
|
|
static struct vio_driver vnet_port_driver = {
|
|
.id_table = vnet_port_match,
|
|
.probe = vnet_port_probe,
|
|
.remove = vnet_port_remove,
|
|
.driver = {
|
|
.name = "vnet_port",
|
|
.owner = THIS_MODULE,
|
|
}
|
|
};
|
|
|
|
static int __init vnet_init(void)
|
|
{
|
|
return vio_register_driver(&vnet_port_driver);
|
|
}
|
|
|
|
static void __exit vnet_exit(void)
|
|
{
|
|
vio_unregister_driver(&vnet_port_driver);
|
|
}
|
|
|
|
module_init(vnet_init);
|
|
module_exit(vnet_exit);
|