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ldmvsw: Make sunvnet_common compatible with ldmvsw 

Modify sunvnet common code and data structures to be compatible
  with both sunvnet and ldmvsw drivers.

  Details:

  Sunvnet operates on "vnet-port" nodes which appear in the Machine
  Description (MD) in a guest domain. Ldmvsw operates on "vsw-port"
  nodes which appear in the MD of a service domain.

  A difference between the sunvnet driver and the ldmvsw driver is
  the sunvnet driver creates a network interface (i.e. a struct net_device)
  for every vnet-port *parent* "network" node. Several vnet-ports may appear
  under this common parent network node - each corresponding to a common parent
  network interface.  Conversely, since bridge/vswitch software will need
  to interface with every vsw-port in a system, the ldmvsw driver creates
  a network interface (i.e. a struct net_device) for every vsw-port - not
  every parent node as with sunvnet.  This difference required some special
  handling in the common code as explained below.

  There are 2 key data structures used by the sunvnet and ldmvsw drivers
  (which are now found in sunvnet_common.h):

  1. struct vnet_port
     This structure represents a vnet-port node in sunvnet and a vsw-port
     in the ldmvsw driver.

  2. struct vnet
     This structure represents a parent "network" node in sunvnet and a parent
     "virtual-network-switch" node in ldmvsw.

  Since the sunvnet driver allocates a net_device for every parent "network"
  node, a net_device member appears in the struct vnet. Since the ldmvsw
  driver allocates a net_device for every port, a net_device member was
  added to the vnet_port. The common code distinguishes which structure
  net_device member to use by checking a 'vsw' bit that was added to the
  vnet_port structure. See the VNET_PORT_TO_NET_DEVICE() marco in
  sunvnet_common.h.

  The netdev_priv() in sunvnet is allocated as a vnet. The netdev_priv()
  in ldmvsw is a vnet_port. Therefore, any place in the common code
  where a netdev_priv() call was made, a wrapper function was implemented
  in each driver to first get the vnet and/or vnet_port (in a driver
  specific way) and pass them as newly added parameters to the common
  functions (see wrapper funcs: vnet_set_rx_mode() and vnet_poll_controller()).
  Since these wrapper functions call __tx_port_find(), __tx_port_find() was
  moved from the common code back into sunvnet.c. Note - ldmvsw.c does not
  require this function.

  These changes also required that port_is_up() be made
  into a common function and thus it was given a _common suffix and
  exported like the other common functions.

  A wrapper function was also added for vnet_start_xmit_common() to pass a
  driver-specific function arg to return the port associated with a given
  struct sk_buff and struct net_device. This was required because
  vnet_start_xmit_common() grabs a lock prior to getting the associated
  port. Using a function pointer arg allowed the code to work unchanged
  without risking changes to the non-trivial locking logic in
  vnet_start_xmit_common().

  Signed-off-by: Aaron Young <aaron.young@oracle.com>
  Signed-off-by: Rashmi Narasimhan <rashmi.narasimhan@oracle.com>
  Reviewed-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
  Reviewed-by: Alexandre Chartre <Alexandre.Chartre@oracle.com>

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Aaron Young 2016-03-15 11:35:38 -07:00 committed by David S. Miller
parent 31762eaa0d
commit 67d0719f06
3 changed files with 121 additions and 70 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

74
drivers/net/ethernet/sun/sunvnet.c
View File

@ -1,6 +1,7 @@
/* sunvnet.c: Sun LDOM Virtual Network Driver.
*
* Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>
* Copyright (C) 2016 Oracle. All rights reserved.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
@ -84,18 +85,83 @@ static const struct ethtool_ops vnet_ethtool_ops = {
static LIST_HEAD(vnet_list);
static DEFINE_MUTEX(vnet_list_mutex);
static 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 (!sunvnet_port_is_up_common(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 (!sunvnet_port_is_up_common(port))
continue;
return port;
}
return NULL;
}
/* func arg to vnet_start_xmit_common() to get the proper tx port */
static struct vnet_port *vnet_tx_port_find(struct sk_buff *skb,
struct net_device *dev)
{
struct vnet *vp = netdev_priv(dev);
return __tx_port_find(vp, 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)
return 0;
return port->q_index;
}
/* Wrappers to common functions */
static int vnet_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
return sunvnet_start_xmit_common(skb, dev, vnet_tx_port_find);
}
static void vnet_set_rx_mode(struct net_device *dev)
{
struct vnet *vp = netdev_priv(dev);
return sunvnet_set_rx_mode_common(dev, vp);
}
#ifdef CONFIG_NET_POLL_CONTROLLER
static void vnet_poll_controller(struct net_device *dev)
{
struct vnet *vp = netdev_priv(dev);
return sunvnet_poll_controller_common(dev, vp);
}
#endif
static const struct net_device_ops vnet_ops = {
.ndo_open = sunvnet_open_common,
.ndo_stop = sunvnet_close_common,
.ndo_set_rx_mode = sunvnet_set_rx_mode_common,
.ndo_set_rx_mode = vnet_set_rx_mode,
.ndo_set_mac_address = sunvnet_set_mac_addr_common,
.ndo_validate_addr = eth_validate_addr,
.ndo_tx_timeout = sunvnet_tx_timeout_common,
.ndo_change_mtu = sunvnet_change_mtu_common,
.ndo_start_xmit = sunvnet_start_xmit_common,
.ndo_select_queue = sunvnet_select_queue_common,
.ndo_start_xmit = vnet_start_xmit,
.ndo_select_queue = vnet_select_queue,
#ifdef CONFIG_NET_POLL_CONTROLLER
.ndo_poll_controller = sunvnet_poll_controller_common,
.ndo_poll_controller = vnet_poll_controller,
#endif
};

89
drivers/net/ethernet/sun/sunvnet_common.c
View File

@ -1,6 +1,7 @@
/* sunvnet.c: Sun LDOM Virtual Network Driver.
*
* Copyright (C) 2007, 2008 David S. Miller <davem@davemloft.net>
* Copyright (C) 2016 Oracle. All rights reserved.
*/
#include <linux/module.h>
@ -62,7 +63,7 @@ static int vnet_port_alloc_tx_ring(struct vnet_port *port);
int sunvnet_send_attr_common(struct vio_driver_state *vio)
{
struct vnet_port *port = to_vnet_port(vio);
struct net_device *dev = port->vp->dev;
struct net_device *dev = VNET_PORT_TO_NET_DEVICE(port);
struct vio_net_attr_info pkt;
int framelen = ETH_FRAME_LEN;
int i, err;
@ -330,7 +331,7 @@ static inline void vnet_fullcsum(struct sk_buff *skb)
static int vnet_rx_one(struct vnet_port *port, struct vio_net_desc *desc)
{
struct net_device *dev = port->vp->dev;
struct net_device *dev = VNET_PORT_TO_NET_DEVICE(port);
unsigned int len = desc->size;
unsigned int copy_len;
struct sk_buff *skb;
@ -633,7 +634,6 @@ 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;
@ -642,8 +642,7 @@ static int vnet_ack(struct vnet_port *port, void *msgbuf)
return 0;
end = pkt->end_idx;
vp = port->vp;
dev = vp->dev;
dev = VNET_PORT_TO_NET_DEVICE(port);
netif_tx_lock(dev);
if (unlikely(!idx_is_pending(dr, end))) {
netif_tx_unlock(dev);
@ -688,10 +687,11 @@ static int vnet_nack(struct vnet_port *port, void *msgbuf)
static int handle_mcast(struct vnet_port *port, void *msgbuf)
{
struct vio_net_mcast_info *pkt = msgbuf;
struct net_device *dev = VNET_PORT_TO_NET_DEVICE(port);
if (pkt->tag.stype != VIO_SUBTYPE_ACK)
pr_err("%s: Got unexpected MCAST reply [%02x:%02x:%04x:%08x]\n",
port->vp->dev->name,
dev->name,
pkt->tag.type,
pkt->tag.stype,
pkt->tag.stype_env,
@ -708,7 +708,8 @@ static void maybe_tx_wakeup(struct vnet_port *port)
{
struct netdev_queue *txq;
txq = netdev_get_tx_queue(port->vp->dev, port->q_index);
txq = netdev_get_tx_queue(VNET_PORT_TO_NET_DEVICE(port),
port->q_index);
__netif_tx_lock(txq, smp_processor_id());
if (likely(netif_tx_queue_stopped(txq))) {
struct vio_dring_state *dr;
@ -719,12 +720,13 @@ static void maybe_tx_wakeup(struct vnet_port *port)
__netif_tx_unlock(txq);
}
static inline bool port_is_up(struct vnet_port *vnet)
bool sunvnet_port_is_up_common(struct vnet_port *vnet)
{
struct vio_driver_state *vio = &vnet->vio;
return !!(vio->hs_state & VIO_HS_COMPLETE);
}
EXPORT_SYMBOL_GPL(sunvnet_port_is_up_common);
static int vnet_event_napi(struct vnet_port *port, int budget)
{
@ -797,7 +799,7 @@ static int vnet_event_napi(struct vnet_port *port, int budget)
napi_resume:
if (likely(msgbuf.tag.type == VIO_TYPE_DATA)) {
if (msgbuf.tag.stype == VIO_SUBTYPE_INFO) {
if (!port_is_up(port)) {
if (!sunvnet_port_is_up_common(port)) {
/* failures like handshake_failure()
* may have cleaned up dring, but
* NAPI polling may bring us here.
@ -911,28 +913,6 @@ static int __vnet_tx_trigger(struct vnet_port *port, u32 start)
return err;
}
static 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)
{
@ -994,9 +974,9 @@ void sunvnet_clean_timer_expire_common(unsigned long port0)
struct sk_buff *freeskbs;
unsigned pending;
netif_tx_lock(port->vp->dev);
netif_tx_lock(VNET_PORT_TO_NET_DEVICE(port));
freeskbs = vnet_clean_tx_ring(port, &pending);
netif_tx_unlock(port->vp->dev);
netif_tx_unlock(VNET_PORT_TO_NET_DEVICE(port));
vnet_free_skbs(freeskbs);
@ -1140,21 +1120,11 @@ static inline struct sk_buff *vnet_skb_shape(struct sk_buff *skb, int ncookies)
return skb;
}
u16 sunvnet_select_queue_common(struct net_device *dev, struct sk_buff *skb,
void *accel_priv, select_queue_fallback_t fallback)
static int vnet_handle_offloads(struct vnet_port *port, struct sk_buff *skb,
struct vnet_port *(*vnet_tx_port)
(struct sk_buff *, struct net_device *))
{
struct vnet *vp = netdev_priv(dev);
struct vnet_port *port = __tx_port_find(vp, skb);
if (port == NULL)
return 0;
return port->q_index;
}
EXPORT_SYMBOL_GPL(sunvnet_select_queue_common);
static int vnet_handle_offloads(struct vnet_port *port, struct sk_buff *skb)
{
struct net_device *dev = port->vp->dev;
struct net_device *dev = VNET_PORT_TO_NET_DEVICE(port);
struct vio_dring_state *dr = &port->vio.drings[VIO_DRIVER_TX_RING];
struct sk_buff *segs;
int maclen, datalen;
@ -1239,7 +1209,8 @@ static int vnet_handle_offloads(struct vnet_port *port, struct sk_buff *skb)
curr->csum_offset = offsetof(struct udphdr, check);
if (!(status & NETDEV_TX_MASK))
status = sunvnet_start_xmit_common(curr, dev);
status = sunvnet_start_xmit_common(curr, dev,
vnet_tx_port);
if (status & NETDEV_TX_MASK)
dev_kfree_skb_any(curr);
}
@ -1253,9 +1224,10 @@ static int vnet_handle_offloads(struct vnet_port *port, struct sk_buff *skb)
return NETDEV_TX_OK;
}
int sunvnet_start_xmit_common(struct sk_buff *skb, struct net_device *dev)
int sunvnet_start_xmit_common(struct sk_buff *skb, struct net_device *dev,
struct vnet_port *(*vnet_tx_port)
(struct sk_buff *, struct net_device *))
{
struct vnet *vp = netdev_priv(dev);
struct vnet_port *port = NULL;
struct vio_dring_state *dr;
struct vio_net_desc *d;
@ -1266,14 +1238,14 @@ int sunvnet_start_xmit_common(struct sk_buff *skb, struct net_device *dev)
struct netdev_queue *txq;
rcu_read_lock();
port = __tx_port_find(vp, skb);
port = vnet_tx_port(skb, dev);
if (unlikely(!port)) {
rcu_read_unlock();
goto out_dropped;
}
if (skb_is_gso(skb) && skb->len > port->tsolen) {
err = vnet_handle_offloads(port, skb);
err = vnet_handle_offloads(port, skb, vnet_tx_port);
rcu_read_unlock();
return err;
}
@ -1588,9 +1560,8 @@ static void __send_mc_list(struct vnet *vp, struct vnet_port *port)
}
}
void sunvnet_set_rx_mode_common(struct net_device *dev)
void sunvnet_set_rx_mode_common(struct net_device *dev, struct vnet *vp)
{
struct vnet *vp = netdev_priv(dev);
struct vnet_port *port;
rcu_read_lock();
@ -1717,9 +1688,8 @@ static int vnet_port_alloc_tx_ring(struct vnet_port *port)
}
#ifdef CONFIG_NET_POLL_CONTROLLER
void sunvnet_poll_controller_common(struct net_device *dev)
void sunvnet_poll_controller_common(struct net_device *dev, struct vnet *vp)
{
struct vnet *vp = netdev_priv(dev);
struct vnet_port *port;
unsigned long flags;
@ -1741,13 +1711,16 @@ void sunvnet_port_add_txq_common(struct vnet_port *port)
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));
netif_tx_wake_queue(netdev_get_tx_queue(VNET_PORT_TO_NET_DEVICE(port),
port->q_index));
}
EXPORT_SYMBOL_GPL(sunvnet_port_add_txq_common);
void sunvnet_port_rm_txq_common(struct vnet_port *port)
{
port->vp->nports--;
netif_tx_stop_queue(netdev_get_tx_queue(port->vp->dev, port->q_index));
netif_tx_stop_queue(netdev_get_tx_queue(VNET_PORT_TO_NET_DEVICE(port),
port->q_index));
}
EXPORT_SYMBOL_GPL(sunvnet_port_rm_txq_common);

28
drivers/net/ethernet/sun/sunvnet_common.h
View File

@ -32,6 +32,13 @@ struct vnet_tx_entry {
};
struct vnet;
/* Structure to describe a vnet-port or vsw-port in the MD.
* If the vsw bit is set, this structure represents a vswitch
* port, and the net_device can be found from ->dev. If the
* vsw bit is not set, the net_device is available from ->vp->dev.
* See the VNET_PORT_TO_NET_DEVICE macro below.
*/
struct vnet_port {
struct vio_driver_state vio;
@ -39,9 +46,11 @@ struct vnet_port {
u8 raddr[ETH_ALEN];
unsigned switch_port:1;
unsigned tso:1;
unsigned __pad:14;
unsigned vsw:1;
unsigned __pad:13;
struct vnet *vp;
struct net_device *dev;
struct vnet_tx_entry tx_bufs[VNET_TX_RING_SIZE];
@ -105,21 +114,23 @@ struct vnet {
int nports;
};
/* Def used by common code to get the net_device from the proper location */
#define VNET_PORT_TO_NET_DEVICE(__port) \
((__port)->vsw ? (__port)->dev : (__port)->vp->dev)
/* Common funcs */
void sunvnet_clean_timer_expire_common(unsigned long port0);
int sunvnet_open_common(struct net_device *dev);
int sunvnet_close_common(struct net_device *dev);
void sunvnet_set_rx_mode_common(struct net_device *dev);
void sunvnet_set_rx_mode_common(struct net_device *dev, struct vnet *vp);
int sunvnet_set_mac_addr_common(struct net_device *dev, void *p);
void sunvnet_tx_timeout_common(struct net_device *dev);
int sunvnet_change_mtu_common(struct net_device *dev, int new_mtu);
int sunvnet_start_xmit_common(struct sk_buff *skb, struct net_device *dev);
u16 sunvnet_select_queue_common(struct net_device *dev,
struct sk_buff *skb,
void *accel_priv,
select_queue_fallback_t fallback);
int sunvnet_start_xmit_common(struct sk_buff *skb, struct net_device *dev,
struct vnet_port *(*vnet_tx_port)
(struct sk_buff *, struct net_device *));
#ifdef CONFIG_NET_POLL_CONTROLLER
void sunvnet_poll_controller_common(struct net_device *dev);
void sunvnet_poll_controller_common(struct net_device *dev, struct vnet *vp);
#endif
void sunvnet_event_common(void *arg, int event);
int sunvnet_send_attr_common(struct vio_driver_state *vio);
@ -127,6 +138,7 @@ int sunvnet_handle_attr_common(struct vio_driver_state *vio, void *arg);
void sunvnet_handshake_complete_common(struct vio_driver_state *vio);
int sunvnet_poll_common(struct napi_struct *napi, int budget);
void sunvnet_port_free_tx_bufs_common(struct vnet_port *port);
bool sunvnet_port_is_up_common(struct vnet_port *vnet);
void sunvnet_port_add_txq_common(struct vnet_port *port);
void sunvnet_port_rm_txq_common(struct vnet_port *port);