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linux/drivers/infiniband/ulp/opa_vnic/opa_vnic_internal.h
Alexander Duyck d80d8d5573 opa_vnic: Just use skb_get_hash instead of skb_tx_hash 
This patch is meant to clean up how the opa_vnic is obtaining entropy from
Tx packets.

The code as it was written was claiming to get 16 bits of hash, but from
what I can tell it was only ever actually getting 14 bits as it was limited
to 0 - (2^15 - 1). It then was folding the result to get a 8 bit value for
entropy.

Instead of throwing away all that input I am cutting out the middle man and
instead having the code call skb_get_hash directly and then folding the 32
bit value into a 8 bit value using a pair of shifts and XOR operations.

Execution wise this new approach should provide more entropy and be faster
since we are bypassing the reciprocal multiplication to reduce the 32b
value to 16b and instead just using a shift/XOR combination.

In addition we can drop the unneeded adapter value from the call to get the
entropy since the netdev itself isn't even needed.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2018-04-29 22:01:32 -04:00

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#ifndef _OPA_VNIC_INTERNAL_H
#define _OPA_VNIC_INTERNAL_H
/*
* Copyright(c) 2017 Intel Corporation.
*
* This file is provided under a dual BSD/GPLv2 license. When using or
* redistributing this file, you may do so under either license.
*
* GPL LICENSE SUMMARY
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* BSD LICENSE
*
* 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.
* - Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
/*
* This file contains OPA VNIC driver internal declarations
*/
#include <linux/bitops.h>
#include <linux/etherdevice.h>
#include <linux/hashtable.h>
#include <linux/sizes.h>
#include <rdma/opa_vnic.h>
#include "opa_vnic_encap.h"
#define OPA_VNIC_VLAN_PCP(vlan_tci) \
(((vlan_tci) & VLAN_PRIO_MASK) >> VLAN_PRIO_SHIFT)
/* Flow to default port redirection table size */
#define OPA_VNIC_FLOW_TBL_SIZE 32
/* Invalid port number */
#define OPA_VNIC_INVALID_PORT 0xff
struct opa_vnic_adapter;
/**
* struct __opa_vesw_info - OPA vnic virtual switch info
*
* Same as opa_vesw_info without bitwise attribute.
*/
struct __opa_vesw_info {
u16 fabric_id;
u16 vesw_id;
u8 rsvd0[6];
u16 def_port_mask;
u8 rsvd1[2];
u16 pkey;
u8 rsvd2[4];
u32 u_mcast_dlid;
u32 u_ucast_dlid[OPA_VESW_MAX_NUM_DEF_PORT];
u32 rc;
u8 rsvd3[56];
u16 eth_mtu;
u8 rsvd4[2];
} __packed;
/**
* struct __opa_per_veswport_info - OPA vnic per port info
*
* Same as opa_per_veswport_info without bitwise attribute.
*/
struct __opa_per_veswport_info {
u32 port_num;
u8 eth_link_status;
u8 rsvd0[3];
u8 base_mac_addr[ETH_ALEN];
u8 config_state;
u8 oper_state;
u16 max_mac_tbl_ent;
u16 max_smac_ent;
u32 mac_tbl_digest;
u8 rsvd1[4];
u32 encap_slid;
u8 pcp_to_sc_uc[OPA_VNIC_MAX_NUM_PCP];
u8 pcp_to_vl_uc[OPA_VNIC_MAX_NUM_PCP];
u8 pcp_to_sc_mc[OPA_VNIC_MAX_NUM_PCP];
u8 pcp_to_vl_mc[OPA_VNIC_MAX_NUM_PCP];
u8 non_vlan_sc_uc;
u8 non_vlan_vl_uc;
u8 non_vlan_sc_mc;
u8 non_vlan_vl_mc;
u8 rsvd2[48];
u16 uc_macs_gen_count;
u16 mc_macs_gen_count;
u8 rsvd3[8];
} __packed;
/**
* struct __opa_veswport_info - OPA vnic port info
*
* Same as opa_veswport_info without bitwise attribute.
*/
struct __opa_veswport_info {
struct __opa_vesw_info vesw;
struct __opa_per_veswport_info vport;
};
/**
* struct __opa_veswport_trap - OPA vnic trap info
*
* Same as opa_veswport_trap without bitwise attribute.
*/
struct __opa_veswport_trap {
u16 fabric_id;
u16 veswid;
u32 veswportnum;
u16 opaportnum;
u8 veswportindex;
u8 opcode;
u32 reserved;
} __packed;
/**
* struct opa_vnic_ctrl_port - OPA virtual NIC control port
* @ibdev: pointer to ib device
* @ops: opa vnic control operations
* @num_ports: number of opa ports
*/
struct opa_vnic_ctrl_port {
struct ib_device *ibdev;
struct opa_vnic_ctrl_ops *ops;
u8 num_ports;
};
/**
* struct opa_vnic_adapter - OPA VNIC netdev private data structure
* @netdev: pointer to associated netdev
* @ibdev: ib device
* @cport: pointer to opa vnic control port
* @rn_ops: rdma netdev's net_device_ops
* @port_num: OPA port number
* @vport_num: vesw port number
* @lock: adapter lock
* @info: virtual ethernet switch port information
* @vema_mac_addr: mac address configured by vema
* @umac_hash: unicast maclist hash
* @mmac_hash: multicast maclist hash
* @mactbl: hash table of MAC entries
* @mactbl_lock: mac table lock
* @stats_lock: statistics lock
* @flow_tbl: flow to default port redirection table
* @trap_timeout: trap timeout
* @trap_count: no. of traps allowed within timeout period
*/
struct opa_vnic_adapter {
struct net_device *netdev;
struct ib_device *ibdev;
struct opa_vnic_ctrl_port *cport;
const struct net_device_ops *rn_ops;
u8 port_num;
u8 vport_num;
/* Lock used around concurrent updates to netdev */
struct mutex lock;
struct __opa_veswport_info info;
u8 vema_mac_addr[ETH_ALEN];
u32 umac_hash;
u32 mmac_hash;
struct hlist_head __rcu *mactbl;
/* Lock used to protect updates to mac table */
struct mutex mactbl_lock;
/* Lock used to protect access to vnic counters */
spinlock_t stats_lock;
u8 flow_tbl[OPA_VNIC_FLOW_TBL_SIZE];
unsigned long trap_timeout;
u8 trap_count;
};
/* Same as opa_veswport_mactable_entry, but without bitwise attribute */
struct __opa_vnic_mactable_entry {
u8 mac_addr[ETH_ALEN];
u8 mac_addr_mask[ETH_ALEN];
u32 dlid_sd;
} __packed;
/**
* struct opa_vnic_mac_tbl_node - OPA VNIC mac table node
* @hlist: hash list handle
* @index: index of entry in the mac table
* @entry: entry in the table
*/
struct opa_vnic_mac_tbl_node {
struct hlist_node hlist;
u16 index;
struct __opa_vnic_mactable_entry entry;
};
#define v_dbg(format, arg...) \
netdev_dbg(adapter->netdev, format, ## arg)
#define v_err(format, arg...) \
netdev_err(adapter->netdev, format, ## arg)
#define v_info(format, arg...) \
netdev_info(adapter->netdev, format, ## arg)
#define v_warn(format, arg...) \
netdev_warn(adapter->netdev, format, ## arg)
#define c_err(format, arg...) \
dev_err(&cport->ibdev->dev, format, ## arg)
#define c_info(format, arg...) \
dev_info(&cport->ibdev->dev, format, ## arg)
#define c_dbg(format, arg...) \
dev_dbg(&cport->ibdev->dev, format, ## arg)
/* The maximum allowed entries in the mac table */
#define OPA_VNIC_MAC_TBL_MAX_ENTRIES 2048
/* Limit of smac entries in mac table */
#define OPA_VNIC_MAX_SMAC_LIMIT 256
/* The last octet of the MAC address is used as the key to the hash table */
#define OPA_VNIC_MAC_HASH_IDX 5
/* The VNIC MAC hash table is of size 2^8 */
#define OPA_VNIC_MAC_TBL_HASH_BITS 8
#define OPA_VNIC_MAC_TBL_SIZE BIT(OPA_VNIC_MAC_TBL_HASH_BITS)
/* VNIC HASH MACROS */
#define vnic_hash_init(hashtable) __hash_init(hashtable, OPA_VNIC_MAC_TBL_SIZE)
#define vnic_hash_add(hashtable, node, key) \
hlist_add_head(node, \
&hashtable[hash_min(key, ilog2(OPA_VNIC_MAC_TBL_SIZE))])
#define vnic_hash_for_each_safe(name, bkt, tmp, obj, member) \
for ((bkt) = 0, obj = NULL; \
!obj && (bkt) < OPA_VNIC_MAC_TBL_SIZE; (bkt)++) \
hlist_for_each_entry_safe(obj, tmp, &name[bkt], member)
#define vnic_hash_for_each_possible(name, obj, member, key) \
hlist_for_each_entry(obj, \
&name[hash_min(key, ilog2(OPA_VNIC_MAC_TBL_SIZE))], member)
#define vnic_hash_for_each(name, bkt, obj, member) \
for ((bkt) = 0, obj = NULL; \
!obj && (bkt) < OPA_VNIC_MAC_TBL_SIZE; (bkt)++) \
hlist_for_each_entry(obj, &name[bkt], member)
extern char opa_vnic_driver_name[];
extern const char opa_vnic_driver_version[];
struct opa_vnic_adapter *opa_vnic_add_netdev(struct ib_device *ibdev,
u8 port_num, u8 vport_num);
void opa_vnic_rem_netdev(struct opa_vnic_adapter *adapter);
void opa_vnic_encap_skb(struct opa_vnic_adapter *adapter, struct sk_buff *skb);
u8 opa_vnic_get_vl(struct opa_vnic_adapter *adapter, struct sk_buff *skb);
u8 opa_vnic_calc_entropy(struct sk_buff *skb);
void opa_vnic_process_vema_config(struct opa_vnic_adapter *adapter);
void opa_vnic_release_mac_tbl(struct opa_vnic_adapter *adapter);
void opa_vnic_query_mac_tbl(struct opa_vnic_adapter *adapter,
struct opa_veswport_mactable *tbl);
int opa_vnic_update_mac_tbl(struct opa_vnic_adapter *adapter,
struct opa_veswport_mactable *tbl);
void opa_vnic_query_ucast_macs(struct opa_vnic_adapter *adapter,
struct opa_veswport_iface_macs *macs);
void opa_vnic_query_mcast_macs(struct opa_vnic_adapter *adapter,
struct opa_veswport_iface_macs *macs);
void opa_vnic_get_summary_counters(struct opa_vnic_adapter *adapter,
struct opa_veswport_summary_counters *cntrs);
void opa_vnic_get_error_counters(struct opa_vnic_adapter *adapter,
struct opa_veswport_error_counters *cntrs);
void opa_vnic_get_vesw_info(struct opa_vnic_adapter *adapter,
struct opa_vesw_info *info);
void opa_vnic_set_vesw_info(struct opa_vnic_adapter *adapter,
struct opa_vesw_info *info);
void opa_vnic_get_per_veswport_info(struct opa_vnic_adapter *adapter,
struct opa_per_veswport_info *info);
void opa_vnic_set_per_veswport_info(struct opa_vnic_adapter *adapter,
struct opa_per_veswport_info *info);
void opa_vnic_vema_report_event(struct opa_vnic_adapter *adapter, u8 event);
void opa_vnic_set_ethtool_ops(struct net_device *netdev);
void opa_vnic_vema_send_trap(struct opa_vnic_adapter *adapter,
struct __opa_veswport_trap *data, u32 lid);
#endif /* _OPA_VNIC_INTERNAL_H */
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