/*
* This file is part of the Chelsio T4 PCI-E SR-IOV Virtual Function Ethernet
* driver for Linux.
*
* Copyright (c) 2009-2010 Chelsio Communications, Inc. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
/*
* This file should not be included directly. Include t4vf_common.h instead.
*/
#ifndef __CXGB4VF_ADAPTER_H__
#define __CXGB4VF_ADAPTER_H__
#include <linux/pci.h>
#include <linux/spinlock.h>
#include <linux/skbuff.h>
#include <linux/if_ether.h>
#include <linux/netdevice.h>
#include "../cxgb4/t4_hw.h"
/*
* Constants of the implementation.
*/
enum {
MAX_NPORTS = 1, /* max # of "ports" */
MAX_PORT_QSETS = 8, /* max # of Queue Sets / "port" */
MAX_ETH_QSETS = MAX_NPORTS*MAX_PORT_QSETS,
/*
* MSI-X interrupt index usage.
*/
MSIX_FW = 0, /* MSI-X index for firmware Q */
MSIX_IQFLINT = 1, /* MSI-X index base for Ingress Qs */
MSIX_EXTRAS = 1,
MSIX_ENTRIES = MAX_ETH_QSETS + MSIX_EXTRAS,
/*
* The maximum number of Ingress and Egress Queues is determined by
* the maximum number of "Queue Sets" which we support plus any
* ancillary queues. Each "Queue Set" requires one Ingress Queue
* for RX Packet Ingress Event notifications and two Egress Queues for
* a Free List and an Ethernet TX list.
*/
INGQ_EXTRAS = 2, /* firmware event queue and */
/* forwarded interrupts */
MAX_INGQ = MAX_ETH_QSETS+INGQ_EXTRAS,
MAX_EGRQ = MAX_ETH_QSETS*2,
};
/*
* Forward structure definition references.
*/
struct adapter;
struct sge_eth_rxq;
struct sge_rspq;
/*
* Per-"port" information. This is really per-Virtual Interface information
* but the use of the "port" nomanclature makes it easier to go back and forth
* between the PF and VF drivers ...
*/
struct port_info {
struct adapter *adapter; /* our adapter */
struct vlan_group *vlan_grp; /* out VLAN group */
u16 viid; /* virtual interface ID */
s16 xact_addr_filt; /* index of our MAC address filter */
u16 rss_size; /* size of VI's RSS table slice */
u8 pidx; /* index into adapter port[] */
u8 port_id; /* physical port ID */
u8 nqsets; /* # of "Queue Sets" */
u8 first_qset; /* index of first "Queue Set" */
struct link_config link_cfg; /* physical port configuration */
};
/*
* Scatter Gather Engine resources for the "adapter". Our ingress and egress
* queues are organized into "Queue Sets" with one ingress and one egress
* queue per Queue Set. These Queue Sets are aportionable between the "ports"
* (Virtual Interfaces). One extra ingress queue is used to receive
* asynchronous messages from the firmware. Note that the "Queue IDs" that we
* use here are really "Relative Queue IDs" which are returned as part of the
* firmware command to allocate queues. These queue IDs are relative to the
* absolute Queue ID base of the section of the Queue ID space allocated to
* the PF/VF.
*/
/*
* SGE free-list queue state.
*/
struct rx_sw_desc;
struct sge_fl {
unsigned int avail; /* # of available RX buffers */
unsigned int pend_cred; /* new buffers since last FL DB ring */
unsigned int cidx; /* consumer index */
unsigned int pidx; /* producer index */
unsigned long alloc_failed; /* # of buffer allocation failures */
unsigned long large_alloc_failed;
unsigned long starving; /* # of times FL was found starving */
/*
* Write-once/infrequently fields.
* -------------------------------
*/
unsigned int cntxt_id; /* SGE relative QID for the free list */
unsigned int abs_id; /* SGE absolute QID for the free list */
unsigned int size; /* capacity of free list */
struct rx_sw_desc *sdesc; /* address of SW RX descriptor ring */
__be64 *desc; /* address of HW RX descriptor ring */
dma_addr_t addr; /* PCI bus address of hardware ring */
};
/*
* An ingress packet gather list.
*/
struct pkt_gl {
skb_frag_t frags[MAX_SKB_FRAGS];
void *va; /* virtual address of first byte */
unsigned int nfrags; /* # of fragments */
unsigned int tot_len; /* total length of fragments */
};
typedef int (*rspq_handler_t)(struct sge_rspq *, const __be64 *,
const struct pkt_gl *);
/*
* State for an SGE Response Queue.
*/
struct sge_rspq {
struct napi_struct napi; /* NAPI scheduling control */
const __be64 *cur_desc; /* current descriptor in queue */
unsigned int cidx; /* consumer index */
u8 gen; /* current generation bit */
u8 next_intr_params; /* holdoff params for next interrupt */
int offset; /* offset into current FL buffer */
unsigned int unhandled_irqs; /* bogus interrupts */
/*
* Write-once/infrequently fields.
* -------------------------------
*/
u8 intr_params; /* interrupt holdoff parameters */
u8 pktcnt_idx; /* interrupt packet threshold */
u8 idx; /* queue index within its group */
u16 cntxt_id; /* SGE rel QID for the response Q */
u16 abs_id; /* SGE abs QID for the response Q */
__be64 *desc; /* address of hardware response ring */
dma_addr_t phys_addr; /* PCI bus address of ring */
unsigned int iqe_len; /* entry size */
unsigned int size; /* capcity of response Q */
struct adapter *adapter; /* our adapter */
struct net_device *netdev; /* associated net device */
rspq_handler_t handler; /* the handler for this response Q */
};
/*
* Ethernet queue statistics
*/
struct sge_eth_stats {
unsigned long pkts; /* # of ethernet packets */
unsigned long lro_pkts; /* # of LRO super packets */
unsigned long lro_merged; /* # of wire packets merged by LRO */
unsigned long rx_cso; /* # of Rx checksum offloads */
unsigned long vlan_ex; /* # of Rx VLAN extractions */
unsigned long rx_drops; /* # of packets dropped due to no mem */
};
/*
* State for an Ethernet Receive Queue.
*/
struct sge_eth_rxq {
struct sge_rspq rspq; /* Response Queue */
struct sge_fl fl; /* Free List */
struct sge_eth_stats stats; /* receive statistics */
};
/*
* SGE Transmit Queue state. This contains all of the resources associated
* with the hardware status of a TX Queue which is a circular ring of hardware
* TX Descriptors. For convenience, it also contains a pointer to a parallel
* "Software Descriptor" array but we don't know anything about it here other
* than its type name.
*/
struct tx_desc {
/*
* Egress Queues are measured in units of SGE_EQ_IDXSIZE by the
* hardware: Sizes, Producer and Consumer indices, etc.
*/
__be64 flit[SGE_EQ_IDXSIZE/sizeof(__be64)];
};
struct tx_sw_desc;
struct sge_txq {
unsigned int in_use; /* # of in-use TX descriptors */
unsigned int size; /* # of descriptors */
unsigned int cidx; /* SW consumer index */
unsigned int pidx; /* producer index */
unsigned long stops; /* # of times queue has been stopped */
unsigned long restarts; /* # of queue restarts */
/*
* Write-once/infrequently fields.
* -------------------------------
*/
unsigned int cntxt_id; /* SGE relative QID for the TX Q */
unsigned int abs_id; /* SGE absolute QID for the TX Q */
struct tx_desc *desc; /* address of HW TX descriptor ring */
struct tx_sw_desc *sdesc; /* address of SW TX descriptor ring */
struct sge_qstat *stat; /* queue status entry */
dma_addr_t phys_addr; /* PCI bus address of hardware ring */
};
/*
* State for an Ethernet Transmit Queue.
*/
struct sge_eth_txq {
struct sge_txq q; /* SGE TX Queue */
struct netdev_queue *txq; /* associated netdev TX queue */
unsigned long tso; /* # of TSO requests */
unsigned long tx_cso; /* # of TX checksum offloads */
unsigned long vlan_ins; /* # of TX VLAN insertions */
unsigned long mapping_err; /* # of I/O MMU packet mapping errors */
};
/*
* The complete set of Scatter/Gather Engine resources.
*/
struct sge {
/*
* Our "Queue Sets" ...
*/
struct sge_eth_txq ethtxq[MAX_ETH_QSETS];
struct sge_eth_rxq ethrxq[MAX_ETH_QSETS];
/*
* Extra ingress queues for asynchronous firmware events and
* forwarded interrupts (when in MSI mode).
*/
struct sge_rspq fw_evtq ____cacheline_aligned_in_smp;
struct sge_rspq intrq ____cacheline_aligned_in_smp;
spinlock_t intrq_lock;
/*
* State for managing "starving Free Lists" -- Free Lists which have
* fallen below a certain threshold of buffers available to the
* hardware and attempts to refill them up to that threshold have
* failed. We have a regular "slow tick" timer process which will
* make periodic attempts to refill these starving Free Lists ...
*/
DECLARE_BITMAP(starving_fl, MAX_EGRQ);
struct timer_list rx_timer;
/*
* State for cleaning up completed TX descriptors.
*/
struct timer_list tx_timer;
/*
* Write-once/infrequently fields.
* -------------------------------
*/
u16 max_ethqsets; /* # of available Ethernet queue sets */
u16 ethqsets; /* # of active Ethernet queue sets */
u16 ethtxq_rover; /* Tx queue to clean up next */
u16 timer_val[SGE_NTIMERS]; /* interrupt holdoff timer array */
u8 counter_val[SGE_NCOUNTERS]; /* interrupt RX threshold array */
/*
* Reverse maps from Absolute Queue IDs to associated queue pointers.
* The absolute Queue IDs are in a compact range which start at a
* [potentially large] Base Queue ID. We perform the reverse map by
* first converting the Absolute Queue ID into a Relative Queue ID by
* subtracting off the Base Queue ID and then use a Relative Queue ID
* indexed table to get the pointer to the corresponding software
* queue structure.
*/
unsigned int egr_base;
unsigned int ingr_base;
void *egr_map[MAX_EGRQ];
struct sge_rspq *ingr_map[MAX_INGQ];
};
/*
* Utility macros to convert Absolute- to Relative-Queue indices and Egress-
* and Ingress-Queues. The EQ_MAP() and IQ_MAP() macros which provide
* pointers to Ingress- and Egress-Queues can be used as both L- and R-values
*/
#define EQ_IDX(s, abs_id) ((unsigned int)((abs_id) - (s)->egr_base))
#define IQ_IDX(s, abs_id) ((unsigned int)((abs_id) - (s)->ingr_base))
#define EQ_MAP(s, abs_id) ((s)->egr_map[EQ_IDX(s, abs_id)])
#define IQ_MAP(s, abs_id) ((s)->ingr_map[IQ_IDX(s, abs_id)])
/*
* Macro to iterate across Queue Sets ("rxq" is a historic misnomer).
*/
#define for_each_ethrxq(sge, iter) \
for (iter = 0; iter < (sge)->ethqsets; iter++)
/*
* Per-"adapter" (Virtual Function) information.
*/
struct adapter {
/* PCI resources */
void __iomem *regs;
struct pci_dev *pdev;
struct device *pdev_dev;
/* "adapter" resources */
unsigned long registered_device_map;
unsigned long open_device_map;
unsigned long flags;
struct adapter_params params;
/* queue and interrupt resources */
struct {
unsigned short vec;
char desc[22];
} msix_info[MSIX_ENTRIES];
struct sge sge;
/* Linux network device resources */
struct net_device *port[MAX_NPORTS];
const char *name;
unsigned int msg_enable;
/* debugfs resources */
struct dentry *debugfs_root;
/* various locks */
spinlock_t stats_lock;
};
enum { /* adapter flags */
FULL_INIT_DONE = (1UL << 0),
USING_MSI = (1UL << 1),
USING_MSIX = (1UL << 2),
QUEUES_BOUND = (1UL << 3),
};
/*
* The following register read/write routine definitions are required by
* the common code.
*/
/**
* t4_read_reg - read a HW register
* @adapter: the adapter
* @reg_addr: the register address
*
* Returns the 32-bit value of the given HW register.
*/
static inline u32 t4_read_reg(struct adapter *adapter, u32 reg_addr)
{
return readl(adapter->regs + reg_addr);
}
/**
* t4_write_reg - write a HW register
* @adapter: the adapter
* @reg_addr: the register address
* @val: the value to write
*
* Write a 32-bit value into the given HW register.
*/
static inline void t4_write_reg(struct adapter *adapter, u32 reg_addr, u32 val)
{
writel(val, adapter->regs + reg_addr);
}
#ifndef readq
static inline u64 readq(const volatile void __iomem *addr)
{
return readl(addr) + ((u64)readl(addr + 4) << 32);
}
static inline void writeq(u64 val, volatile void __iomem *addr)
{
writel(val, addr);
writel(val >> 32, addr + 4);
}
#endif
/**
* t4_read_reg64 - read a 64-bit HW register
* @adapter: the adapter
* @reg_addr: the register address
*
* Returns the 64-bit value of the given HW register.
*/
static inline u64 t4_read_reg64(struct adapter *adapter, u32 reg_addr)
{
return readq(adapter->regs + reg_addr);
}
/**
* t4_write_reg64 - write a 64-bit HW register
* @adapter: the adapter
* @reg_addr: the register address
* @val: the value to write
*
* Write a 64-bit value into the given HW register.
*/
static inline void t4_write_reg64(struct adapter *adapter, u32 reg_addr,
u64 val)
{
writeq(val, adapter->regs + reg_addr);
}
/**
* port_name - return the string name of a port
* @adapter: the adapter
* @pidx: the port index
*
* Return the string name of the selected port.
*/
static inline const char *port_name(struct adapter *adapter, int pidx)
{
return adapter->port[pidx]->name;
}
/**
* t4_os_set_hw_addr - store a port's MAC address in SW
* @adapter: the adapter
* @pidx: the port index
* @hw_addr: the Ethernet address
*
* Store the Ethernet address of the given port in SW. Called by the common
* code when it retrieves a port's Ethernet address from EEPROM.
*/
static inline void t4_os_set_hw_addr(struct adapter *adapter, int pidx,
u8 hw_addr[])
{
memcpy(adapter->port[pidx]->dev_addr, hw_addr, ETH_ALEN);
memcpy(adapter->port[pidx]->perm_addr, hw_addr, ETH_ALEN);
}
/**
* netdev2pinfo - return the port_info structure associated with a net_device
* @dev: the netdev
*
* Return the struct port_info associated with a net_device
*/
static inline struct port_info *netdev2pinfo(const struct net_device *dev)
{
return netdev_priv(dev);
}
/**
* adap2pinfo - return the port_info of a port
* @adap: the adapter
* @pidx: the port index
*
* Return the port_info structure for the adapter.
*/
static inline struct port_info *adap2pinfo(struct adapter *adapter, int pidx)
{
return netdev_priv(adapter->port[pidx]);
}
/**
* netdev2adap - return the adapter structure associated with a net_device
* @dev: the netdev
*
* Return the struct adapter associated with a net_device
*/
static inline struct adapter *netdev2adap(const struct net_device *dev)
{
return netdev2pinfo(dev)->adapter;
}
/*
* OS "Callback" function declarations. These are functions that the OS code
* is "contracted" to provide for the common code.
*/
void t4vf_os_link_changed(struct adapter *, int, int);
/*
* SGE function prototype declarations.
*/
int t4vf_sge_alloc_rxq(struct adapter *, struct sge_rspq *, bool,
struct net_device *, int,
struct sge_fl *, rspq_handler_t);
int t4vf_sge_alloc_eth_txq(struct adapter *, struct sge_eth_txq *,
struct net_device *, struct netdev_queue *,
unsigned int);
void t4vf_free_sge_resources(struct adapter *);
int t4vf_eth_xmit(struct sk_buff *, struct net_device *);
int t4vf_ethrx_handler(struct sge_rspq *, const __be64 *,
const struct pkt_gl *);
irq_handler_t t4vf_intr_handler(struct adapter *);
irqreturn_t t4vf_sge_intr_msix(int, void *);
int t4vf_sge_init(struct adapter *);
void t4vf_sge_start(struct adapter *);
void t4vf_sge_stop(struct adapter *);
#endif /* __CXGB4VF_ADAPTER_H__ */