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67d0719f06
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>
146 lines
3.9 KiB
C
146 lines
3.9 KiB
C
#ifndef _SUNVNETCOMMON_H
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#define _SUNVNETCOMMON_H
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#include <linux/interrupt.h>
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/* length of time (or less) we expect pending descriptors to be marked
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* as VIO_DESC_DONE and skbs ready to be freed
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*/
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#define VNET_CLEAN_TIMEOUT ((HZ / 100) + 1)
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#define VNET_MAXPACKET (65535ULL + ETH_HLEN + VLAN_HLEN)
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#define VNET_TX_RING_SIZE 512
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#define VNET_TX_WAKEUP_THRESH(dr) ((dr)->pending / 4)
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#define VNET_MINTSO 2048 /* VIO protocol's minimum TSO len */
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#define VNET_MAXTSO 65535 /* VIO protocol's maximum TSO len */
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/* VNET packets are sent in buffers with the first 6 bytes skipped
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* so that after the ethernet header the IPv4/IPv6 headers are aligned
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* properly.
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*/
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#define VNET_PACKET_SKIP 6
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#define VNET_MAXCOOKIES (VNET_MAXPACKET / PAGE_SIZE + 1)
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#define VNET_MAX_TXQS 16
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struct vnet_tx_entry {
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struct sk_buff *skb;
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unsigned int ncookies;
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struct ldc_trans_cookie cookies[VNET_MAXCOOKIES];
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};
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struct vnet;
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/* Structure to describe a vnet-port or vsw-port in the MD.
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* If the vsw bit is set, this structure represents a vswitch
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* port, and the net_device can be found from ->dev. If the
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* vsw bit is not set, the net_device is available from ->vp->dev.
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* See the VNET_PORT_TO_NET_DEVICE macro below.
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*/
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struct vnet_port {
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struct vio_driver_state vio;
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struct hlist_node hash;
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u8 raddr[ETH_ALEN];
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unsigned switch_port:1;
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unsigned tso:1;
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unsigned vsw:1;
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unsigned __pad:13;
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struct vnet *vp;
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struct net_device *dev;
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struct vnet_tx_entry tx_bufs[VNET_TX_RING_SIZE];
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struct list_head list;
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u32 stop_rx_idx;
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bool stop_rx;
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bool start_cons;
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struct timer_list clean_timer;
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u64 rmtu;
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u16 tsolen;
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struct napi_struct napi;
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u32 napi_stop_idx;
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bool napi_resume;
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int rx_event;
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u16 q_index;
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};
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static inline struct vnet_port *to_vnet_port(struct vio_driver_state *vio)
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{
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return container_of(vio, struct vnet_port, vio);
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}
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#define VNET_PORT_HASH_SIZE 16
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#define VNET_PORT_HASH_MASK (VNET_PORT_HASH_SIZE - 1)
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static inline unsigned int vnet_hashfn(u8 *mac)
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{
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unsigned int val = mac[4] ^ mac[5];
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return val & (VNET_PORT_HASH_MASK);
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}
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struct vnet_mcast_entry {
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u8 addr[ETH_ALEN];
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u8 sent;
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u8 hit;
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struct vnet_mcast_entry *next;
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};
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struct vnet {
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/* Protects port_list and port_hash. */
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spinlock_t lock;
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struct net_device *dev;
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u32 msg_enable;
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struct list_head port_list;
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struct hlist_head port_hash[VNET_PORT_HASH_SIZE];
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struct vnet_mcast_entry *mcast_list;
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struct list_head list;
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u64 local_mac;
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int nports;
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};
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/* Def used by common code to get the net_device from the proper location */
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#define VNET_PORT_TO_NET_DEVICE(__port) \
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((__port)->vsw ? (__port)->dev : (__port)->vp->dev)
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/* Common funcs */
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void sunvnet_clean_timer_expire_common(unsigned long port0);
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int sunvnet_open_common(struct net_device *dev);
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int sunvnet_close_common(struct net_device *dev);
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void sunvnet_set_rx_mode_common(struct net_device *dev, struct vnet *vp);
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int sunvnet_set_mac_addr_common(struct net_device *dev, void *p);
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void sunvnet_tx_timeout_common(struct net_device *dev);
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int sunvnet_change_mtu_common(struct net_device *dev, int new_mtu);
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int sunvnet_start_xmit_common(struct sk_buff *skb, struct net_device *dev,
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struct vnet_port *(*vnet_tx_port)
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(struct sk_buff *, struct net_device *));
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#ifdef CONFIG_NET_POLL_CONTROLLER
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void sunvnet_poll_controller_common(struct net_device *dev, struct vnet *vp);
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#endif
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void sunvnet_event_common(void *arg, int event);
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int sunvnet_send_attr_common(struct vio_driver_state *vio);
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int sunvnet_handle_attr_common(struct vio_driver_state *vio, void *arg);
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void sunvnet_handshake_complete_common(struct vio_driver_state *vio);
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int sunvnet_poll_common(struct napi_struct *napi, int budget);
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void sunvnet_port_free_tx_bufs_common(struct vnet_port *port);
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bool sunvnet_port_is_up_common(struct vnet_port *vnet);
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void sunvnet_port_add_txq_common(struct vnet_port *port);
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void sunvnet_port_rm_txq_common(struct vnet_port *port);
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#endif /* _SUNVNETCOMMON_H */
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