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linux/drivers/net/ethernet/sun/sunvnet.c

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/* sunvnet.c: Sun LDOM Virtual Network Driver.
*
* Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/netdevice.h>
#include <linux/ethtool.h>
#include <linux/etherdevice.h>
#include <linux/mutex.h>
#include <linux/highmem.h>
#include <linux/if_vlan.h>
#if IS_ENABLED(CONFIG_IPV6)
#include <linux/icmpv6.h>
#endif
#include <net/ip.h>
#include <net/icmp.h>
#include <net/route.h>
#include <asm/vio.h>
#include <asm/ldc.h>
#include "sunvnet.h"
#define DRV_MODULE_NAME "sunvnet"
#define DRV_MODULE_VERSION "1.0"
#define DRV_MODULE_RELDATE "June 25, 2007"
static char version[] =
DRV_MODULE_NAME ".c:v" DRV_MODULE_VERSION " (" DRV_MODULE_RELDATE ")\n";
MODULE_AUTHOR("David S. Miller (davem@davemloft.net)");
MODULE_DESCRIPTION("Sun LDOM virtual network driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_MODULE_VERSION);
#define VNET_MAX_TXQS 16
/* Heuristic for the number of times to exponentially backoff and
* retry sending an LDC trigger when EAGAIN is encountered
*/
#define VNET_MAX_RETRIES 10
static int __vnet_tx_trigger(struct vnet_port *port, u32 start);
/* Ordered from largest major to lowest */
static struct vio_version vnet_versions[] = {
{ .major = 1, .minor = 8 },
{ .major = 1, .minor = 7 },
{ .major = 1, .minor = 6 },
{ .major = 1, .minor = 0 },
};
static inline u32 vnet_tx_dring_avail(struct vio_dring_state *dr)
{
return vio_dring_avail(dr, VNET_TX_RING_SIZE);
}
static int vnet_handle_unknown(struct vnet_port *port, void *arg)
{
struct vio_msg_tag *pkt = arg;
pr_err("Received unknown msg [%02x:%02x:%04x:%08x]\n",
pkt->type, pkt->stype, pkt->stype_env, pkt->sid);
pr_err("Resetting connection\n");
ldc_disconnect(port->vio.lp);
return -ECONNRESET;
}
static int vnet_port_alloc_tx_ring(struct vnet_port *port);
static int vnet_send_attr(struct vio_driver_state *vio)
{
struct vnet_port *port = to_vnet_port(vio);
struct net_device *dev = port->vp->dev;
struct vio_net_attr_info pkt;
int framelen = ETH_FRAME_LEN;
int i, err;
err = vnet_port_alloc_tx_ring(to_vnet_port(vio));
if (err)
return err;
memset(&pkt, 0, sizeof(pkt));
pkt.tag.type = VIO_TYPE_CTRL;
pkt.tag.stype = VIO_SUBTYPE_INFO;
pkt.tag.stype_env = VIO_ATTR_INFO;
pkt.tag.sid = vio_send_sid(vio);
if (vio_version_before(vio, 1, 2))
pkt.xfer_mode = VIO_DRING_MODE;
else
pkt.xfer_mode = VIO_NEW_DRING_MODE;
pkt.addr_type = VNET_ADDR_ETHERMAC;
pkt.ack_freq = 0;
for (i = 0; i < 6; i++)
pkt.addr |= (u64)dev->dev_addr[i] << ((5 - i) * 8);
if (vio_version_after(vio, 1, 3)) {
if (port->rmtu) {
port->rmtu = min(VNET_MAXPACKET, port->rmtu);
pkt.mtu = port->rmtu;
} else {
port->rmtu = VNET_MAXPACKET;
pkt.mtu = port->rmtu;
}
if (vio_version_after_eq(vio, 1, 6))
pkt.options = VIO_TX_DRING;
} else if (vio_version_before(vio, 1, 3)) {
pkt.mtu = framelen;
} else { /* v1.3 */
pkt.mtu = framelen + VLAN_HLEN;
}
pkt.cflags = 0;
if (vio_version_after_eq(vio, 1, 7) && port->tso) {
pkt.cflags |= VNET_LSO_IPV4_CAPAB;
if (!port->tsolen)
port->tsolen = VNET_MAXTSO;
pkt.ipv4_lso_maxlen = port->tsolen;
}
pkt.plnk_updt = PHYSLINK_UPDATE_NONE;
viodbg(HS, "SEND NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] "
"ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] mtu[%llu] "
"cflags[0x%04x] lso_max[%u]\n",
pkt.xfer_mode, pkt.addr_type,
(unsigned long long)pkt.addr,
pkt.ack_freq, pkt.plnk_updt, pkt.options,
(unsigned long long)pkt.mtu, pkt.cflags, pkt.ipv4_lso_maxlen);
return vio_ldc_send(vio, &pkt, sizeof(pkt));
}
static int handle_attr_info(struct vio_driver_state *vio,
struct vio_net_attr_info *pkt)
{
struct vnet_port *port = to_vnet_port(vio);
u64 localmtu;
u8 xfer_mode;
viodbg(HS, "GOT NET ATTR xmode[0x%x] atype[0x%x] addr[%llx] "
"ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] mtu[%llu] "
" (rmtu[%llu]) cflags[0x%04x] lso_max[%u]\n",
pkt->xfer_mode, pkt->addr_type,
(unsigned long long)pkt->addr,
pkt->ack_freq, pkt->plnk_updt, pkt->options,
(unsigned long long)pkt->mtu, port->rmtu, pkt->cflags,
pkt->ipv4_lso_maxlen);
pkt->tag.sid = vio_send_sid(vio);
xfer_mode = pkt->xfer_mode;
/* for version < 1.2, VIO_DRING_MODE = 0x3 and no bitmask */
if (vio_version_before(vio, 1, 2) && xfer_mode == VIO_DRING_MODE)
xfer_mode = VIO_NEW_DRING_MODE;
/* MTU negotiation:
* < v1.3 - ETH_FRAME_LEN exactly
* > v1.3 - MIN(pkt.mtu, VNET_MAXPACKET, port->rmtu) and change
* pkt->mtu for ACK
* = v1.3 - ETH_FRAME_LEN + VLAN_HLEN exactly
*/
if (vio_version_before(vio, 1, 3)) {
localmtu = ETH_FRAME_LEN;
} else if (vio_version_after(vio, 1, 3)) {
localmtu = port->rmtu ? port->rmtu : VNET_MAXPACKET;
localmtu = min(pkt->mtu, localmtu);
pkt->mtu = localmtu;
} else { /* v1.3 */
localmtu = ETH_FRAME_LEN + VLAN_HLEN;
}
port->rmtu = localmtu;
/* LSO negotiation */
if (vio_version_after_eq(vio, 1, 7))
port->tso &= !!(pkt->cflags & VNET_LSO_IPV4_CAPAB);
else
port->tso = false;
if (port->tso) {
if (!port->tsolen)
port->tsolen = VNET_MAXTSO;
port->tsolen = min(port->tsolen, pkt->ipv4_lso_maxlen);
if (port->tsolen < VNET_MINTSO) {
port->tso = false;
port->tsolen = 0;
pkt->cflags &= ~VNET_LSO_IPV4_CAPAB;
}
pkt->ipv4_lso_maxlen = port->tsolen;
} else {
pkt->cflags &= ~VNET_LSO_IPV4_CAPAB;
pkt->ipv4_lso_maxlen = 0;
}
/* for version >= 1.6, ACK packet mode we support */
if (vio_version_after_eq(vio, 1, 6)) {
pkt->xfer_mode = VIO_NEW_DRING_MODE;
pkt->options = VIO_TX_DRING;
}
if (!(xfer_mode | VIO_NEW_DRING_MODE) ||
pkt->addr_type != VNET_ADDR_ETHERMAC ||
pkt->mtu != localmtu) {
viodbg(HS, "SEND NET ATTR NACK\n");
pkt->tag.stype = VIO_SUBTYPE_NACK;
(void) vio_ldc_send(vio, pkt, sizeof(*pkt));
return -ECONNRESET;
} else {
viodbg(HS, "SEND NET ATTR ACK xmode[0x%x] atype[0x%x] "
"addr[%llx] ackfreq[%u] plnk_updt[0x%02x] opts[0x%02x] "
"mtu[%llu] (rmtu[%llu]) cflags[0x%04x] lso_max[%u]\n",
pkt->xfer_mode, pkt->addr_type,
(unsigned long long)pkt->addr,
pkt->ack_freq, pkt->plnk_updt, pkt->options,
(unsigned long long)pkt->mtu, port->rmtu, pkt->cflags,
pkt->ipv4_lso_maxlen);
pkt->tag.stype = VIO_SUBTYPE_ACK;
return vio_ldc_send(vio, pkt, sizeof(*pkt));
}
}
static int handle_attr_ack(struct vio_driver_state *vio,
struct vio_net_attr_info *pkt)
{
viodbg(HS, "GOT NET ATTR ACK\n");
return 0;
}
static int handle_attr_nack(struct vio_driver_state *vio,
struct vio_net_attr_info *pkt)
{
viodbg(HS, "GOT NET ATTR NACK\n");
return -ECONNRESET;
}
static int vnet_handle_attr(struct vio_driver_state *vio, void *arg)
{
struct vio_net_attr_info *pkt = arg;
switch (pkt->tag.stype) {
case VIO_SUBTYPE_INFO:
return handle_attr_info(vio, pkt);
case VIO_SUBTYPE_ACK:
return handle_attr_ack(vio, pkt);
case VIO_SUBTYPE_NACK:
return handle_attr_nack(vio, pkt);
default:
return -ECONNRESET;
}
}
static void vnet_handshake_complete(struct vio_driver_state *vio)
{
struct vio_dring_state *dr;
dr = &vio->drings[VIO_DRIVER_RX_RING];
dr->snd_nxt = dr->rcv_nxt = 1;
dr = &vio->drings[VIO_DRIVER_TX_RING];
dr->snd_nxt = dr->rcv_nxt = 1;
}
/* The hypervisor interface that implements copying to/from imported
* memory from another domain requires that copies are done to 8-byte
* aligned buffers, and that the lengths of such copies are also 8-byte
* multiples.
*
* So we align skb->data to an 8-byte multiple and pad-out the data
* area so we can round the copy length up to the next multiple of
* 8 for the copy.
*
* The transmitter puts the actual start of the packet 6 bytes into
* the buffer it sends over, so that the IP headers after the ethernet
* header are aligned properly. These 6 bytes are not in the descriptor
* length, they are simply implied. This offset is represented using
* the VNET_PACKET_SKIP macro.
*/
static struct sk_buff *alloc_and_align_skb(struct net_device *dev,
unsigned int len)
{
struct sk_buff *skb = netdev_alloc_skb(dev, len+VNET_PACKET_SKIP+8+8);
unsigned long addr, off;
if (unlikely(!skb))
return NULL;
addr = (unsigned long) skb->data;
off = ((addr + 7UL) & ~7UL) - addr;
if (off)
skb_reserve(skb, off);
return skb;
}
static inline void vnet_fullcsum(struct sk_buff *skb)
{
struct iphdr *iph = ip_hdr(skb);
int offset = skb_transport_offset(skb);
if (skb->protocol != htons(ETH_P_IP))
return;
if (iph->protocol != IPPROTO_TCP &&
iph->protocol != IPPROTO_UDP)
return;
skb->ip_summed = CHECKSUM_NONE;
skb->csum_level = 1;
skb->csum = 0;
if (iph->protocol == IPPROTO_TCP) {
struct tcphdr *ptcp = tcp_hdr(skb);
ptcp->check = 0;
skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
ptcp->check = csum_tcpudp_magic(iph->saddr, iph->daddr,
skb->len - offset, IPPROTO_TCP,
skb->csum);
} else if (iph->protocol == IPPROTO_UDP) {
struct udphdr *pudp = udp_hdr(skb);
pudp->check = 0;
skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
pudp->check = csum_tcpudp_magic(iph->saddr, iph->daddr,
skb->len - offset, IPPROTO_UDP,
skb->csum);
}
}
static int vnet_rx_one(struct vnet_port *port, struct vio_net_desc *desc)
{
struct net_device *dev = port->vp->dev;
unsigned int len = desc->size;
unsigned int copy_len;
struct sk_buff *skb;
int err;
err = -EMSGSIZE;
if (unlikely(len < ETH_ZLEN || len > port->rmtu)) {
dev->stats.rx_length_errors++;
goto out_dropped;
}
skb = alloc_and_align_skb(dev, len);
err = -ENOMEM;
if (unlikely(!skb)) {
dev->stats.rx_missed_errors++;
goto out_dropped;
}
copy_len = (len + VNET_PACKET_SKIP + 7U) & ~7U;
skb_put(skb, copy_len);
err = ldc_copy(port->vio.lp, LDC_COPY_IN,
skb->data, copy_len, 0,
desc->cookies, desc->ncookies);
if (unlikely(err < 0)) {
dev->stats.rx_frame_errors++;
goto out_free_skb;
}
skb_pull(skb, VNET_PACKET_SKIP);
skb_trim(skb, len);
skb->protocol = eth_type_trans(skb, dev);
if (vio_version_after_eq(&port->vio, 1, 8)) {
struct vio_net_dext *dext = vio_net_ext(desc);
if (dext->flags & VNET_PKT_HCK_IPV4_HDRCKSUM) {
if (skb->protocol == ETH_P_IP) {
struct iphdr *iph = (struct iphdr *)skb->data;
iph->check = 0;
ip_send_check(iph);
}
}
if ((dext->flags & VNET_PKT_HCK_FULLCKSUM) &&
skb->ip_summed == CHECKSUM_NONE)
vnet_fullcsum(skb);
if (dext->flags & VNET_PKT_HCK_IPV4_HDRCKSUM_OK) {
skb->ip_summed = CHECKSUM_PARTIAL;
skb->csum_level = 0;
if (dext->flags & VNET_PKT_HCK_FULLCKSUM_OK)
skb->csum_level = 1;
}
}
skb->ip_summed = port->switch_port ? CHECKSUM_NONE : CHECKSUM_PARTIAL;
dev->stats.rx_packets++;
dev->stats.rx_bytes += len;
napi_gro_receive(&port->napi, skb);
return 0;
out_free_skb:
kfree_skb(skb);
out_dropped:
dev->stats.rx_dropped++;
return err;
}
static int vnet_send_ack(struct vnet_port *port, struct vio_dring_state *dr,
u32 start, u32 end, u8 vio_dring_state)
{
struct vio_dring_data hdr = {
.tag = {
.type = VIO_TYPE_DATA,
.stype = VIO_SUBTYPE_ACK,
.stype_env = VIO_DRING_DATA,
.sid = vio_send_sid(&port->vio),
},
.dring_ident = dr->ident,
.start_idx = start,
.end_idx = end,
.state = vio_dring_state,
};
int err, delay;
int retries = 0;
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;
if (retries++ > VNET_MAX_RETRIES) {
pr_info("ECONNRESET %x:%x:%x:%x:%x:%x\n",
port->raddr[0], port->raddr[1],
port->raddr[2], port->raddr[3],
port->raddr[4], port->raddr[5]);
break;
}
} while (err == -EAGAIN);
if (err <= 0 && vio_dring_state == VIO_DRING_STOPPED) {
port->stop_rx_idx = end;
port->stop_rx = true;
} else {
port->stop_rx_idx = 0;
port->stop_rx = false;
}
return err;
}
static struct vio_net_desc *get_rx_desc(struct vnet_port *port,
struct vio_dring_state *dr,
u32 index)
{
struct vio_net_desc *desc = port->vio.desc_buf;
int err;
err = ldc_get_dring_entry(port->vio.lp, desc, dr->entry_size,
(index * dr->entry_size),
dr->cookies, dr->ncookies);
if (err < 0)
return ERR_PTR(err);
return desc;
}
static int put_rx_desc(struct vnet_port *port,
struct vio_dring_state *dr,
struct vio_net_desc *desc,
u32 index)
{
int err;
err = ldc_put_dring_entry(port->vio.lp, desc, dr->entry_size,
(index * dr->entry_size),
dr->cookies, dr->ncookies);
if (err < 0)
return err;
return 0;
}
static int vnet_walk_rx_one(struct vnet_port *port,
struct vio_dring_state *dr,
u32 index, int *needs_ack)
{
struct vio_net_desc *desc = get_rx_desc(port, dr, index);
struct vio_driver_state *vio = &port->vio;
int err;
BUG_ON(desc == NULL);
if (IS_ERR(desc))
return PTR_ERR(desc);
if (desc->hdr.state != VIO_DESC_READY)
return 1;
rmb();
viodbg(DATA, "vio_walk_rx_one desc[%02x:%02x:%08x:%08x:%llx:%llx]\n",
desc->hdr.state, desc->hdr.ack,
desc->size, desc->ncookies,
desc->cookies[0].cookie_addr,
desc->cookies[0].cookie_size);
err = vnet_rx_one(port, desc);
if (err == -ECONNRESET)
return err;
desc->hdr.state = VIO_DESC_DONE;
err = put_rx_desc(port, dr, desc, index);
if (err < 0)
return err;
*needs_ack = desc->hdr.ack;
return 0;
}
static int vnet_walk_rx(struct vnet_port *port, struct vio_dring_state *dr,
u32 start, u32 end, int *npkts, int budget)
{
struct vio_driver_state *vio = &port->vio;
int ack_start = -1, ack_end = -1;
bool send_ack = true;
end = (end == (u32) -1) ? vio_dring_prev(dr, start)
: vio_dring_next(dr, end);
viodbg(DATA, "vnet_walk_rx start[%08x] end[%08x]\n", start, end);
while (start != end) {
int ack = 0, err = vnet_walk_rx_one(port, dr, start, &ack);
if (err == -ECONNRESET)
return err;
if (err != 0)
break;
(*npkts)++;
if (ack_start == -1)
ack_start = start;
ack_end = start;
start = vio_dring_next(dr, start);
if (ack && start != end) {
err = vnet_send_ack(port, dr, ack_start, ack_end,
VIO_DRING_ACTIVE);
if (err == -ECONNRESET)
return err;
ack_start = -1;
}
if ((*npkts) >= budget) {
send_ack = false;
break;
}
}
if (unlikely(ack_start == -1))
ack_start = ack_end = vio_dring_prev(dr, start);
if (send_ack) {
port->napi_resume = false;
return vnet_send_ack(port, dr, ack_start, ack_end,
VIO_DRING_STOPPED);
} else {
port->napi_resume = true;
port->napi_stop_idx = ack_end;
return 1;
}
}
static int vnet_rx(struct vnet_port *port, void *msgbuf, int *npkts,
int budget)
{
struct vio_dring_data *pkt = msgbuf;
struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_RX_RING];
struct vio_driver_state *vio = &port->vio;
viodbg(DATA, "vnet_rx stype_env[%04x] seq[%016llx] rcv_nxt[%016llx]\n",
pkt->tag.stype_env, pkt->seq, dr->rcv_nxt);
if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
return 0;
if (unlikely(pkt->seq != dr->rcv_nxt)) {
pr_err("RX out of sequence seq[0x%llx] rcv_nxt[0x%llx]\n",
pkt->seq, dr->rcv_nxt);
return 0;
}
if (!port->napi_resume)
dr->rcv_nxt++;
/* XXX Validate pkt->start_idx and pkt->end_idx XXX */
return vnet_walk_rx(port, dr, pkt->start_idx, pkt->end_idx,
npkts, budget);
}
static int idx_is_pending(struct vio_dring_state *dr, u32 end)
{
u32 idx = dr->cons;
int found = 0;
while (idx != dr->prod) {
if (idx == end) {
found = 1;
break;
}
idx = vio_dring_next(dr, idx);
}
return found;
}
static int vnet_ack(struct vnet_port *port, void *msgbuf)
{
struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
struct vio_dring_data *pkt = msgbuf;
struct net_device *dev;
struct vnet *vp;
u32 end;
struct vio_net_desc *desc;
struct netdev_queue *txq;
if (unlikely(pkt->tag.stype_env != VIO_DRING_DATA))
return 0;
end = pkt->end_idx;
vp = port->vp;
dev = vp->dev;
netif_tx_lock(dev);
if (unlikely(!idx_is_pending(dr, end))) {
netif_tx_unlock(dev);
return 0;
}
/* sync for race conditions with vnet_start_xmit() and tell xmit it
* is time to send a trigger.
*/
dr->cons = vio_dring_next(dr, end);
desc = vio_dring_entry(dr, dr->cons);
if (desc->hdr.state == VIO_DESC_READY && !port->start_cons) {
/* vnet_start_xmit() just populated this dring but missed
* sending the "start" LDC message to the consumer.
* Send a "start" trigger on its behalf.
*/
if (__vnet_tx_trigger(port, dr->cons) > 0)
port->start_cons = false;
else
port->start_cons = true;
} else {
port->start_cons = true;
}
netif_tx_unlock(dev);
txq = netdev_get_tx_queue(dev, port->q_index);
if (unlikely(netif_tx_queue_stopped(txq) &&
vnet_tx_dring_avail(dr) >= VNET_TX_WAKEUP_THRESH(dr)))
return 1;
return 0;
}
static int vnet_nack(struct vnet_port *port, void *msgbuf)
{
/* XXX just reset or similar XXX */
return 0;
}
static int handle_mcast(struct vnet_port *port, void *msgbuf)
{
struct vio_net_mcast_info *pkt = msgbuf;
if (pkt->tag.stype != VIO_SUBTYPE_ACK)
pr_err("%s: Got unexpected MCAST reply [%02x:%02x:%04x:%08x]\n",
port->vp->dev->name,
pkt->tag.type,
pkt->tag.stype,
pkt->tag.stype_env,
pkt->tag.sid);
return 0;
}
/* Got back a STOPPED LDC message on port. If the queue is stopped,
* wake it up so that we'll send out another START message at the
* next TX.
*/
static void maybe_tx_wakeup(struct vnet_port *port)
{
struct netdev_queue *txq;
txq = netdev_get_tx_queue(port->vp->dev, port->q_index);
__netif_tx_lock(txq, smp_processor_id());
if (likely(netif_tx_queue_stopped(txq))) {
struct vio_dring_state *dr;
dr = &port->vio.drings[VIO_DRIVER_TX_RING];
netif_tx_wake_queue(txq);
}
__netif_tx_unlock(txq);
}
static inline bool port_is_up(struct vnet_port *vnet)
{
struct vio_driver_state *vio = &vnet->vio;
return !!(vio->hs_state & VIO_HS_COMPLETE);
}
static int vnet_event_napi(struct vnet_port *port, int budget)
{
struct vio_driver_state *vio = &port->vio;
int tx_wakeup, err;
int npkts = 0;
int event = (port->rx_event & LDC_EVENT_RESET);
ldc_ctrl:
if (unlikely(event == LDC_EVENT_RESET ||
event == LDC_EVENT_UP)) {
vio_link_state_change(vio, event);
if (event == LDC_EVENT_RESET) {
port->rmtu = 0;
port->tso = true;
port->tsolen = 0;
vio_port_up(vio);
}
port->rx_event = 0;
return 0;
}
/* We may have multiple LDC events in rx_event. Unroll send_events() */
event = (port->rx_event & LDC_EVENT_UP);
port->rx_event &= ~(LDC_EVENT_RESET|LDC_EVENT_UP);
if (event == LDC_EVENT_UP)
goto ldc_ctrl;
event = port->rx_event;
if (!(event & LDC_EVENT_DATA_READY))
return 0;
/* we dont expect any other bits than RESET, UP, DATA_READY */
BUG_ON(event != LDC_EVENT_DATA_READY);
tx_wakeup = err = 0;
while (1) {
union {
struct vio_msg_tag tag;
u64 raw[8];
} msgbuf;
if (port->napi_resume) {
struct vio_dring_data *pkt =
(struct vio_dring_data *)&msgbuf;
struct vio_dring_state *dr =
&port->vio.drings[VIO_DRIVER_RX_RING];
pkt->tag.type = VIO_TYPE_DATA;
pkt->tag.stype = VIO_SUBTYPE_INFO;
pkt->tag.stype_env = VIO_DRING_DATA;
pkt->seq = dr->rcv_nxt;
pkt->start_idx = vio_dring_next(dr, port->napi_stop_idx);
pkt->end_idx = -1;
goto napi_resume;
}
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;
napi_resume:
if (likely(msgbuf.tag.type == VIO_TYPE_DATA)) {
if (msgbuf.tag.stype == VIO_SUBTYPE_INFO) {
if (!port_is_up(port)) {
/* failures like handshake_failure()
* may have cleaned up dring, but
* NAPI polling may bring us here.
*/
err = -ECONNRESET;
break;
}
err = vnet_rx(port, &msgbuf, &npkts, budget);
if (npkts >= budget)
break;
if (npkts == 0)
break;
} 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;
}
if (unlikely(tx_wakeup && err != -ECONNRESET))
maybe_tx_wakeup(port);
return npkts;
}
static int vnet_poll(struct napi_struct *napi, int budget)
{
struct vnet_port *port = container_of(napi, struct vnet_port, napi);
struct vio_driver_state *vio = &port->vio;
int processed = vnet_event_napi(port, budget);
if (processed < budget) {
napi_complete(napi);
port->rx_event &= ~LDC_EVENT_DATA_READY;
vio_set_intr(vio->vdev->rx_ino, HV_INTR_ENABLED);
}
return processed;
}
static void vnet_event(void *arg, int event)
{
struct vnet_port *port = arg;
struct vio_driver_state *vio = &port->vio;
port->rx_event |= event;
vio_set_intr(vio->vdev->rx_ino, HV_INTR_DISABLED);
napi_schedule(&port->napi);
}
static int __vnet_tx_trigger(struct vnet_port *port, u32 start)
{
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 = start,
.end_idx = (u32) -1,
};
int err, delay;
int retries = 0;
if (port->stop_rx) {
err = vnet_send_ack(port,
&port->vio.drings[VIO_DRIVER_RX_RING],
port->stop_rx_idx, -1,
VIO_DRING_STOPPED);
if (err <= 0)
return err;
}
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;
if (retries++ > VNET_MAX_RETRIES)
break;
} 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 vnet_port *port;
hlist_for_each_entry_rcu(port, hp, hash) {
if (!port_is_up(port))
continue;
if (ether_addr_equal(port->raddr, skb->data))
return port;
}
list_for_each_entry_rcu(port, &vp->port_list, list) {
if (!port->switch_port)
continue;
if (!port_is_up(port))
continue;
return port;
}
return NULL;
}
static struct sk_buff *vnet_clean_tx_ring(struct vnet_port *port,
unsigned *pending)
{
struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
struct sk_buff *skb = NULL;
int i, txi;
*pending = 0;
txi = dr->prod-1;
if (txi < 0)
txi = VNET_TX_RING_SIZE-1;
for (i = 0; i < VNET_TX_RING_SIZE; ++i) {
struct vio_net_desc *d;
d = vio_dring_entry(dr, txi);
if (d->hdr.state == VIO_DESC_DONE) {
if (port->tx_bufs[txi].skb) {
BUG_ON(port->tx_bufs[txi].skb->next);
port->tx_bufs[txi].skb->next = skb;
skb = port->tx_bufs[txi].skb;
port->tx_bufs[txi].skb = NULL;
ldc_unmap(port->vio.lp,
port->tx_bufs[txi].cookies,
port->tx_bufs[txi].ncookies);
}
d->hdr.state = VIO_DESC_FREE;
} else if (d->hdr.state == VIO_DESC_READY) {
(*pending)++;
} else if (d->hdr.state == VIO_DESC_FREE) {
break;
}
--txi;
if (txi < 0)
txi = VNET_TX_RING_SIZE-1;
}
return skb;
}
static inline void vnet_free_skbs(struct sk_buff *skb)
{
struct sk_buff *next;
while (skb) {
next = skb->next;
skb->next = NULL;
dev_kfree_skb(skb);
skb = next;
}
}
static void vnet_clean_timer_expire(unsigned long port0)
{
struct vnet_port *port = (struct vnet_port *)port0;
struct sk_buff *freeskbs;
unsigned pending;
netif_tx_lock(port->vp->dev);
freeskbs = vnet_clean_tx_ring(port, &pending);
netif_tx_unlock(port->vp->dev);
vnet_free_skbs(freeskbs);
if (pending)
(void)mod_timer(&port->clean_timer,
jiffies + VNET_CLEAN_TIMEOUT);
else
del_timer(&port->clean_timer);
}
static inline int vnet_skb_map(struct ldc_channel *lp, struct sk_buff *skb,
struct ldc_trans_cookie *cookies, int ncookies,
unsigned int map_perm)
{
int i, nc, err, blen;
/* header */
blen = skb_headlen(skb);
if (blen < ETH_ZLEN)
blen = ETH_ZLEN;
blen += VNET_PACKET_SKIP;
blen += 8 - (blen & 7);
err = ldc_map_single(lp, skb->data-VNET_PACKET_SKIP, blen, cookies,
ncookies, map_perm);
if (err < 0)
return err;
nc = err;
for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
skb_frag_t *f = &skb_shinfo(skb)->frags[i];
u8 *vaddr;
if (nc < ncookies) {
vaddr = kmap_atomic(skb_frag_page(f));
blen = skb_frag_size(f);
blen += 8 - (blen & 7);
err = ldc_map_single(lp, vaddr + f->page_offset,
blen, cookies + nc, ncookies - nc,
map_perm);
kunmap_atomic(vaddr);
} else {
err = -EMSGSIZE;
}
if (err < 0) {
ldc_unmap(lp, cookies, nc);
return err;
}
nc += err;
}
return nc;
}
static inline struct sk_buff *vnet_skb_shape(struct sk_buff *skb, int ncookies)
{
struct sk_buff *nskb;
int i, len, pad, docopy;
len = skb->len;
pad = 0;
if (len < ETH_ZLEN) {
pad += ETH_ZLEN - skb->len;
len += pad;
}
len += VNET_PACKET_SKIP;
pad += 8 - (len & 7);
/* make sure we have enough cookies and alignment in every frag */
docopy = skb_shinfo(skb)->nr_frags >= ncookies;
for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
skb_frag_t *f = &skb_shinfo(skb)->frags[i];
docopy |= f->page_offset & 7;
}
if (((unsigned long)skb->data & 7) != VNET_PACKET_SKIP ||
skb_tailroom(skb) < pad ||
skb_headroom(skb) < VNET_PACKET_SKIP || docopy) {
int start = 0, offset;
__wsum csum;
len = skb->len > ETH_ZLEN ? skb->len : ETH_ZLEN;
nskb = alloc_and_align_skb(skb->dev, len);
if (nskb == NULL) {
dev_kfree_skb(skb);
return NULL;
}
skb_reserve(nskb, VNET_PACKET_SKIP);
nskb->protocol = skb->protocol;
offset = skb_mac_header(skb) - skb->data;
skb_set_mac_header(nskb, offset);
offset = skb_network_header(skb) - skb->data;
skb_set_network_header(nskb, offset);
offset = skb_transport_header(skb) - skb->data;
skb_set_transport_header(nskb, offset);
offset = 0;
nskb->csum_offset = skb->csum_offset;
nskb->ip_summed = skb->ip_summed;
if (skb->ip_summed == CHECKSUM_PARTIAL)
start = skb_checksum_start_offset(skb);
if (start) {
struct iphdr *iph = ip_hdr(nskb);
int offset = start + nskb->csum_offset;
if (skb_copy_bits(skb, 0, nskb->data, start)) {
dev_kfree_skb(nskb);
dev_kfree_skb(skb);
return NULL;
}
*(__sum16 *)(skb->data + offset) = 0;
csum = skb_copy_and_csum_bits(skb, start,
nskb->data + start,
skb->len - start, 0);
if (iph->protocol == IPPROTO_TCP ||
iph->protocol == IPPROTO_UDP) {
csum = csum_tcpudp_magic(iph->saddr, iph->daddr,
skb->len - start,
iph->protocol, csum);
}
*(__sum16 *)(nskb->data + offset) = csum;
nskb->ip_summed = CHECKSUM_NONE;
} else if (skb_copy_bits(skb, 0, nskb->data, skb->len)) {
dev_kfree_skb(nskb);
dev_kfree_skb(skb);
return NULL;
}
(void)skb_put(nskb, skb->len);
if (skb_is_gso(skb)) {
skb_shinfo(nskb)->gso_size = skb_shinfo(skb)->gso_size;
skb_shinfo(nskb)->gso_type = skb_shinfo(skb)->gso_type;
}
dev_kfree_skb(skb);
skb = nskb;
}
return skb;
}
static u16
vnet_select_queue(struct net_device *dev, struct sk_buff *skb,
void *accel_priv, select_queue_fallback_t fallback)
{
struct vnet *vp = netdev_priv(dev);
struct vnet_port *port = __tx_port_find(vp, skb);
if (port == NULL)
return 0;
return port->q_index;
}
static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev);
static int vnet_handle_offloads(struct vnet_port *port, struct sk_buff *skb)
{
struct net_device *dev = port->vp->dev;
struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
struct sk_buff *segs;
int maclen, datalen;
int status;
int gso_size, gso_type, gso_segs;
int hlen = skb_transport_header(skb) - skb_mac_header(skb);
int proto = IPPROTO_IP;
if (skb->protocol == htons(ETH_P_IP))
proto = ip_hdr(skb)->protocol;
else if (skb->protocol == htons(ETH_P_IPV6))
proto = ipv6_hdr(skb)->nexthdr;
if (proto == IPPROTO_TCP)
hlen += tcp_hdr(skb)->doff * 4;
else if (proto == IPPROTO_UDP)
hlen += sizeof(struct udphdr);
else {
pr_err("vnet_handle_offloads GSO with unknown transport "
"protocol %d tproto %d\n", skb->protocol, proto);
hlen = 128; /* XXX */
}
datalen = port->tsolen - hlen;
gso_size = skb_shinfo(skb)->gso_size;
gso_type = skb_shinfo(skb)->gso_type;
gso_segs = skb_shinfo(skb)->gso_segs;
if (port->tso && gso_size < datalen)
gso_segs = DIV_ROUND_UP(skb->len - hlen, datalen);
if (unlikely(vnet_tx_dring_avail(dr) < gso_segs)) {
struct netdev_queue *txq;
txq = netdev_get_tx_queue(dev, port->q_index);
netif_tx_stop_queue(txq);
if (vnet_tx_dring_avail(dr) < skb_shinfo(skb)->gso_segs)
return NETDEV_TX_BUSY;
netif_tx_wake_queue(txq);
}
maclen = skb_network_header(skb) - skb_mac_header(skb);
skb_pull(skb, maclen);
if (port->tso && gso_size < datalen) {
/* segment to TSO size */
skb_shinfo(skb)->gso_size = datalen;
skb_shinfo(skb)->gso_segs = gso_segs;
segs = skb_gso_segment(skb, dev->features & ~NETIF_F_TSO);
/* restore gso_size & gso_segs */
skb_shinfo(skb)->gso_size = gso_size;
skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(skb->len - hlen,
gso_size);
} else
segs = skb_gso_segment(skb, dev->features & ~NETIF_F_TSO);
if (IS_ERR(segs)) {
dev->stats.tx_dropped++;
dev_kfree_skb_any(skb);
return NETDEV_TX_OK;
}
skb_push(skb, maclen);
skb_reset_mac_header(skb);
status = 0;
while (segs) {
struct sk_buff *curr = segs;
segs = segs->next;
curr->next = NULL;
if (port->tso && curr->len > dev->mtu) {
skb_shinfo(curr)->gso_size = gso_size;
skb_shinfo(curr)->gso_type = gso_type;
skb_shinfo(curr)->gso_segs =
DIV_ROUND_UP(curr->len - hlen, gso_size);
} else
skb_shinfo(curr)->gso_size = 0;
skb_push(curr, maclen);
skb_reset_mac_header(curr);
memcpy(skb_mac_header(curr), skb_mac_header(skb),
maclen);
curr->csum_start = skb_transport_header(curr) - curr->head;
if (ip_hdr(curr)->protocol == IPPROTO_TCP)
curr->csum_offset = offsetof(struct tcphdr, check);
else if (ip_hdr(curr)->protocol == IPPROTO_UDP)
curr->csum_offset = offsetof(struct udphdr, check);
if (!(status & NETDEV_TX_MASK))
status = vnet_start_xmit(curr, dev);
if (status & NETDEV_TX_MASK)
dev_kfree_skb_any(curr);
}
if (!(status & NETDEV_TX_MASK))
dev_kfree_skb_any(skb);
return status;
}
static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct vnet *vp = netdev_priv(dev);
struct vnet_port *port = NULL;
struct vio_dring_state *dr;
struct vio_net_desc *d;
unsigned int len;
struct sk_buff *freeskbs = NULL;
int i, err, txi;
unsigned pending = 0;
struct netdev_queue *txq;
rcu_read_lock();
port = __tx_port_find(vp, skb);
if (unlikely(!port)) {
rcu_read_unlock();
goto out_dropped;
}
if (skb_is_gso(skb) && skb->len > port->tsolen) {
err = vnet_handle_offloads(port, skb);
rcu_read_unlock();
return err;
}
if (!skb_is_gso(skb) && skb->len > port->rmtu) {
unsigned long localmtu = port->rmtu - ETH_HLEN;
if (vio_version_after_eq(&port->vio, 1, 3))
localmtu -= VLAN_HLEN;
if (skb->protocol == htons(ETH_P_IP)) {
struct flowi4 fl4;
struct rtable *rt = NULL;
memset(&fl4, 0, sizeof(fl4));
fl4.flowi4_oif = dev->ifindex;
fl4.flowi4_tos = RT_TOS(ip_hdr(skb)->tos);
fl4.daddr = ip_hdr(skb)->daddr;
fl4.saddr = ip_hdr(skb)->saddr;
rt = ip_route_output_key(dev_net(dev), &fl4);
rcu_read_unlock();
if (!IS_ERR(rt)) {
skb_dst_set(skb, &rt->dst);
icmp_send(skb, ICMP_DEST_UNREACH,
ICMP_FRAG_NEEDED,
htonl(localmtu));
}
}
#if IS_ENABLED(CONFIG_IPV6)
else if (skb->protocol == htons(ETH_P_IPV6))
icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, localmtu);
#endif
goto out_dropped;
}
skb = vnet_skb_shape(skb, 2);
if (unlikely(!skb))
goto out_dropped;
if (skb->ip_summed == CHECKSUM_PARTIAL)
vnet_fullcsum(skb);
dr = &port->vio.drings[VIO_DRIVER_TX_RING];
i = skb_get_queue_mapping(skb);
txq = netdev_get_tx_queue(dev, i);
if (unlikely(vnet_tx_dring_avail(dr) < 1)) {
if (!netif_tx_queue_stopped(txq)) {
netif_tx_stop_queue(txq);
/* This is a hard error, log it. */
netdev_err(dev, "BUG! Tx Ring full when queue awake!\n");
dev->stats.tx_errors++;
}
rcu_read_unlock();
return NETDEV_TX_BUSY;
}
d = vio_dring_cur(dr);
txi = dr->prod;
freeskbs = vnet_clean_tx_ring(port, &pending);
BUG_ON(port->tx_bufs[txi].skb);
len = skb->len;
if (len < ETH_ZLEN)
len = ETH_ZLEN;
err = vnet_skb_map(port->vio.lp, skb, port->tx_bufs[txi].cookies, 2,
(LDC_MAP_SHADOW | LDC_MAP_DIRECT | LDC_MAP_RW));
if (err < 0) {
netdev_info(dev, "tx buffer map error %d\n", err);
goto out_dropped;
}
port->tx_bufs[txi].skb = skb;
skb = NULL;
port->tx_bufs[txi].ncookies = err;
/* We don't rely on the ACKs to free the skb in vnet_start_xmit(),
* thus it is safe to not set VIO_ACK_ENABLE for each transmission:
* the protocol itself does not require it as long as the peer
* sends a VIO_SUBTYPE_ACK for VIO_DRING_STOPPED.
*
* An ACK for every packet in the ring is expensive as the
* sending of LDC messages is slow and affects performance.
*/
d->hdr.ack = VIO_ACK_DISABLE;
d->size = len;
d->ncookies = port->tx_bufs[txi].ncookies;
for (i = 0; i < d->ncookies; i++)
d->cookies[i] = port->tx_bufs[txi].cookies[i];
if (vio_version_after_eq(&port->vio, 1, 7)) {
struct vio_net_dext *dext = vio_net_ext(d);
memset(dext, 0, sizeof(*dext));
if (skb_is_gso(port->tx_bufs[txi].skb)) {
dext->ipv4_lso_mss = skb_shinfo(port->tx_bufs[txi].skb)
->gso_size;
dext->flags |= VNET_PKT_IPV4_LSO;
}
if (vio_version_after_eq(&port->vio, 1, 8) &&
!port->switch_port) {
dext->flags |= VNET_PKT_HCK_IPV4_HDRCKSUM_OK;
dext->flags |= VNET_PKT_HCK_FULLCKSUM_OK;
}
}
/* 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;
/* Exactly one ldc "start" trigger (for dr->cons) needs to be sent
* to notify the consumer that some descriptors are READY.
* After that "start" trigger, no additional triggers are needed until
* a DRING_STOPPED is received from the consumer. The dr->cons field
* (set up by vnet_ack()) has the value of the next dring index
* that has not yet been ack-ed. We send a "start" trigger here
* if, and only if, start_cons is true (reset it afterward). Conversely,
* vnet_ack() should check if the dring corresponding to cons
* is marked READY, but start_cons was false.
* If so, vnet_ack() should send out the missed "start" trigger.
*
* Note that the wmb() above makes sure the cookies et al. are
* not globally visible before the VIO_DESC_READY, and that the
* stores are ordered correctly by the compiler. The consumer will
* not proceed until the VIO_DESC_READY is visible assuring that
* the consumer does not observe anything related to descriptors
* out of order. The HV trap from the LDC start trigger is the
* producer to consumer announcement that work is available to the
* consumer
*/
if (!port->start_cons)
goto ldc_start_done; /* previous trigger suffices */
err = __vnet_tx_trigger(port, dr->cons);
if (unlikely(err < 0)) {
netdev_info(dev, "TX trigger error %d\n", err);
d->hdr.state = VIO_DESC_FREE;
dev->stats.tx_carrier_errors++;
goto out_dropped;
}
ldc_start_done:
port->start_cons = false;
dev->stats.tx_packets++;
dev->stats.tx_bytes += port->tx_bufs[txi].skb->len;
dr->prod = (dr->prod + 1) & (VNET_TX_RING_SIZE - 1);
if (unlikely(vnet_tx_dring_avail(dr) < 1)) {
netif_tx_stop_queue(txq);
if (vnet_tx_dring_avail(dr) > VNET_TX_WAKEUP_THRESH(dr))
netif_tx_wake_queue(txq);
}
(void)mod_timer(&port->clean_timer, jiffies + VNET_CLEAN_TIMEOUT);
rcu_read_unlock();
vnet_free_skbs(freeskbs);
return NETDEV_TX_OK;
out_dropped:
if (pending)
(void)mod_timer(&port->clean_timer,
jiffies + VNET_CLEAN_TIMEOUT);
else if (port)
del_timer(&port->clean_timer);
if (port)
rcu_read_unlock();
if (skb)
dev_kfree_skb(skb);
vnet_free_skbs(freeskbs);
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_tx_start_all_queues(dev);
return 0;
}
static int vnet_close(struct net_device *dev)
{
netif_tx_stop_all_queues(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 (ether_addr_equal(m->addr, addr))
return m;
}
return NULL;
}
static void __update_mc_list(struct vnet *vp, struct net_device *dev)
{
struct netdev_hw_addr *ha;
netdev_for_each_mc_addr(ha, dev) {
struct vnet_mcast_entry *m;
m = __vnet_mc_find(vp, ha->addr);
if (m) {
m->hit = 1;
continue;
}
if (!m) {
m = kzalloc(sizeof(*m), GFP_ATOMIC);
if (!m)
continue;
memcpy(m->addr, ha->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;
rcu_read_lock();
list_for_each_entry_rcu(port, &vp->port_list, list) {
if (port->switch_port) {
__update_mc_list(vp, dev);
__send_mc_list(vp, port);
break;
}
}
rcu_read_unlock();
}
static int vnet_change_mtu(struct net_device *dev, int new_mtu)
{
if (new_mtu < 68 || new_mtu > 65535)
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)
{
strlcpy(info->driver, DRV_MODULE_NAME, sizeof(info->driver));
strlcpy(info->version, DRV_MODULE_VERSION, sizeof(info->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++) {
struct vio_net_desc *d;
void *skb = port->tx_bufs[i].skb;
if (!skb)
continue;
d = vio_dring_entry(dr, i);
if (d->hdr.state == VIO_DESC_READY)
pr_warn("active transmit buffers freed\n");
ldc_unmap(port->vio.lp,
port->tx_bufs[i].cookies,
port->tx_bufs[i].ncookies);
dev_kfree_skb(skb);
port->tx_bufs[i].skb = NULL;
d->hdr.state = VIO_DESC_FREE;
}
}
static int vnet_port_alloc_tx_ring(struct vnet_port *port)
{
struct vio_dring_state *dr;
unsigned long len, elen;
int i, err, ncookies;
void *dring;
dr = &port->vio.drings[VIO_DRIVER_TX_RING];
elen = sizeof(struct vio_net_desc) +
sizeof(struct ldc_trans_cookie) * 2;
if (vio_version_after_eq(&port->vio, 1, 7))
elen += sizeof(struct vio_net_dext);
len = VNET_TX_RING_SIZE * elen;
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 = elen;
dr->num_entries = VNET_TX_RING_SIZE;
dr->prod = dr->cons = 0;
port->start_cons = true; /* need an initial trigger */
dr->pending = VNET_TX_RING_SIZE;
dr->ncookies = ncookies;
for (i = 0; i < VNET_TX_RING_SIZE; ++i) {
struct vio_net_desc *d;
d = vio_dring_entry(dr, i);
d->hdr.state = VIO_DESC_FREE;
}
return 0;
err_out:
vnet_port_free_tx_bufs(port);
return err;
}
#ifdef CONFIG_NET_POLL_CONTROLLER
static void vnet_poll_controller(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);
napi_schedule(&port->napi);
}
spin_unlock_irqrestore(&vp->lock, flags);
}
#endif
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_rx_mode = 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,
.ndo_select_queue = vnet_select_queue,
#ifdef CONFIG_NET_POLL_CONTROLLER
.ndo_poll_controller = vnet_poll_controller,
#endif
};
static struct vnet *vnet_new(const u64 *local_mac)
{
struct net_device *dev;
struct vnet *vp;
int err, i;
dev = alloc_etherdev_mqs(sizeof(*vp), VNET_MAX_TXQS, 1);
if (!dev)
return ERR_PTR(-ENOMEM);
dev->needed_headroom = VNET_PACKET_SKIP + 8;
dev->needed_tailroom = 8;
for (i = 0; i < ETH_ALEN; i++)
dev->dev_addr[i] = (*local_mac >> (5 - i) * 8) & 0xff;
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;
dev->hw_features = NETIF_F_TSO | NETIF_F_GSO | NETIF_F_GSO_SOFTWARE |
NETIF_F_HW_CSUM | NETIF_F_SG;
dev->features = dev->hw_features;
err = register_netdev(dev);
if (err) {
pr_err("Cannot register net device, aborting\n");
goto err_out_free_dev;
}
netdev_info(dev, "Sun LDOM vnet %pM\n", dev->dev_addr);
list_add(&vp->list, &vnet_list);
return vp;
err_out_free_dev:
free_netdev(dev);
return ERR_PTR(err);
}
static struct vnet *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 void vnet_cleanup(void)
{
struct vnet *vp;
struct net_device *dev;
mutex_lock(&vnet_list_mutex);
while (!list_empty(&vnet_list)) {
vp = list_first_entry(&vnet_list, struct vnet, list);
list_del(&vp->list);
dev = vp->dev;
/* vio_unregister_driver() should have cleaned up port_list */
BUG_ON(!list_empty(&vp->port_list));
unregister_netdev(dev);
free_netdev(dev);
}
mutex_unlock(&vnet_list_mutex);
}
static const char *local_mac_prop = "local-mac-address";
static struct vnet *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 print_version(void)
{
printk_once(KERN_INFO "%s", version);
}
const char *remote_macaddr_prop = "remote-mac-address";
static void
vnet_port_add_txq(struct vnet_port *port)
{
struct vnet *vp = port->vp;
int n;
n = vp->nports++;
n = n & (VNET_MAX_TXQS - 1);
port->q_index = n;
netif_tx_wake_queue(netdev_get_tx_queue(vp->dev, port->q_index));
}
static void
vnet_port_rm_txq(struct vnet_port *port)
{
port->vp->nports--;
netif_tx_stop_queue(netdev_get_tx_queue(port->vp->dev, port->q_index));
}
static int 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)) {
pr_err("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) {
pr_err("Port lacks %s property\n", remote_macaddr_prop);
goto err_out_put_mdesc;
}
port = kzalloc(sizeof(*port), GFP_KERNEL);
err = -ENOMEM;
if (!port)
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;
netif_napi_add(port->vp->dev, &port->napi, vnet_poll, NAPI_POLL_WEIGHT);
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;
port->tso = true;
port->tsolen = 0;
spin_lock_irqsave(&vp->lock, flags);
if (switch_port)
list_add_rcu(&port->list, &vp->port_list);
else
list_add_tail_rcu(&port->list, &vp->port_list);
hlist_add_head_rcu(&port->hash,
&vp->port_hash[vnet_hashfn(port->raddr)]);
vnet_port_add_txq(port);
spin_unlock_irqrestore(&vp->lock, flags);
dev_set_drvdata(&vdev->dev, port);
pr_info("%s: PORT ( remote-mac %pM%s )\n",
vp->dev->name, port->raddr, switch_port ? " switch-port" : "");
setup_timer(&port->clean_timer, vnet_clean_timer_expire,
(unsigned long)port);
napi_enable(&port->napi);
vio_port_up(&port->vio);
mdesc_release(hp);
return 0;
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) {
del_timer_sync(&port->vio.timer);
napi_disable(&port->napi);
list_del_rcu(&port->list);
hlist_del_rcu(&port->hash);
synchronize_rcu();
del_timer_sync(&port->clean_timer);
vnet_port_rm_txq(port);
netif_napi_del(&port->napi);
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,
.name = "vnet_port",
};
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);
vnet_cleanup();
}
module_init(vnet_init);
module_exit(vnet_exit);
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