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/*
* 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 encapsulation/decapsulation function.
*/
#include <linux/if_ether.h>
#include <linux/if_vlan.h>
#include "opa_vnic_internal.h"
/* OPA 16B Header fields */
#define OPA_16B_LID_MASK 0xFFFFFull
#define OPA_16B_SLID_HIGH_SHFT 8
#define OPA_16B_SLID_MASK 0xF00ull
#define OPA_16B_DLID_MASK 0xF000ull
#define OPA_16B_DLID_HIGH_SHFT 12
#define OPA_16B_LEN_SHFT 20
#define OPA_16B_SC_SHFT 20
#define OPA_16B_RC_SHFT 25
#define OPA_16B_PKEY_SHFT 16
#define OPA_VNIC_L4_HDR_SHFT 16
/* L2+L4 hdr len is 20 bytes (5 quad words) */
#define OPA_VNIC_HDR_QW_LEN 5
static inline void opa_vnic_make_header(u8 *hdr, u32 slid, u32 dlid, u16 len,
u16 pkey, u16 entropy, u8 sc, u8 rc,
u8 l4_type, u16 l4_hdr)
{
/* h[1]: LT=1, 16B L2=10 */
u32 h[OPA_VNIC_HDR_QW_LEN] = {0, 0xc0000000, 0, 0, 0};
h[2] = l4_type;
h[3] = entropy;
h[4] = l4_hdr << OPA_VNIC_L4_HDR_SHFT;
/* Extract and set 4 upper bits and 20 lower bits of the lids */
h[0] |= (slid & OPA_16B_LID_MASK);
h[2] |= ((slid >> (20 - OPA_16B_SLID_HIGH_SHFT)) & OPA_16B_SLID_MASK);
h[1] |= (dlid & OPA_16B_LID_MASK);
h[2] |= ((dlid >> (20 - OPA_16B_DLID_HIGH_SHFT)) & OPA_16B_DLID_MASK);
h[0] |= (len << OPA_16B_LEN_SHFT);
h[1] |= (rc << OPA_16B_RC_SHFT);
h[1] |= (sc << OPA_16B_SC_SHFT);
h[2] |= ((u32)pkey << OPA_16B_PKEY_SHFT);
memcpy(hdr, h, OPA_VNIC_HDR_LEN);
}
/* opa_vnic_get_dlid - find and return the DLID */
static uint32_t opa_vnic_get_dlid(struct opa_vnic_adapter *adapter,
struct sk_buff *skb, u8 def_port)
{
struct __opa_veswport_info *info = &adapter->info;
struct ethhdr *mac_hdr = (struct ethhdr *)skb_mac_header(skb);
u32 dlid;
if (is_multicast_ether_addr(mac_hdr->h_dest)) {
dlid = info->vesw.u_mcast_dlid;
} else {
if (is_local_ether_addr(mac_hdr->h_dest)) {
dlid = ((uint32_t)mac_hdr->h_dest[5] << 16) |
((uint32_t)mac_hdr->h_dest[4] << 8) |
mac_hdr->h_dest[3];
if (unlikely(!dlid))
v_warn("Null dlid in MAC address\n");
} else if (def_port != OPA_VNIC_INVALID_PORT) {
dlid = info->vesw.u_ucast_dlid[def_port];
}
}
return dlid;
}
/* opa_vnic_get_sc - return the service class */
static u8 opa_vnic_get_sc(struct __opa_veswport_info *info,
struct sk_buff *skb)
{
struct ethhdr *mac_hdr = (struct ethhdr *)skb_mac_header(skb);
u16 vlan_tci;
u8 sc;
if (!__vlan_get_tag(skb, &vlan_tci)) {
u8 pcp = OPA_VNIC_VLAN_PCP(vlan_tci);
if (is_multicast_ether_addr(mac_hdr->h_dest))
sc = info->vport.pcp_to_sc_mc[pcp];
else
sc = info->vport.pcp_to_sc_uc[pcp];
} else {
if (is_multicast_ether_addr(mac_hdr->h_dest))
sc = info->vport.non_vlan_sc_mc;
else
sc = info->vport.non_vlan_sc_uc;
}
return sc;
}
u8 opa_vnic_get_vl(struct opa_vnic_adapter *adapter, struct sk_buff *skb)
{
struct ethhdr *mac_hdr = (struct ethhdr *)skb_mac_header(skb);
struct __opa_veswport_info *info = &adapter->info;
u8 vl;
if (skb_vlan_tag_present(skb)) {
u8 pcp = skb_vlan_tag_get(skb) >> VLAN_PRIO_SHIFT;
if (is_multicast_ether_addr(mac_hdr->h_dest))
vl = info->vport.pcp_to_vl_mc[pcp];
else
vl = info->vport.pcp_to_vl_uc[pcp];
} else {
if (is_multicast_ether_addr(mac_hdr->h_dest))
vl = info->vport.non_vlan_vl_mc;
else
vl = info->vport.non_vlan_vl_uc;
}
return vl;
}
/* opa_vnic_calc_entropy - calculate the packet entropy */
u8 opa_vnic_calc_entropy(struct opa_vnic_adapter *adapter, struct sk_buff *skb)
{
u16 hash16;
/*
* Get flow based 16-bit hash and then XOR the upper and lower bytes
* to get the entropy.
* __skb_tx_hash limits qcount to 16 bits. Hence, get 15-bit hash.
*/
hash16 = __skb_tx_hash(adapter->netdev, skb, BIT(15));
return (u8)((hash16 >> 8) ^ (hash16 & 0xff));
}
/* opa_vnic_get_def_port - get default port based on entropy */
static inline u8 opa_vnic_get_def_port(struct opa_vnic_adapter *adapter,
u8 entropy)
{
u8 flow_id;
/* Add the upper and lower 4-bits of entropy to get the flow id */
flow_id = ((entropy & 0xf) + (entropy >> 4));
return adapter->flow_tbl[flow_id & (OPA_VNIC_FLOW_TBL_SIZE - 1)];
}
/* Calculate packet length including OPA header, crc and padding */
static inline int opa_vnic_wire_length(struct sk_buff *skb)
{
u32 pad_len;
/* padding for 8 bytes size alignment */
pad_len = -(skb->len + OPA_VNIC_ICRC_TAIL_LEN) & 0x7;
pad_len += OPA_VNIC_ICRC_TAIL_LEN;
return (skb->len + pad_len) >> 3;
}
/* opa_vnic_encap_skb - encapsulate skb packet with OPA header and meta data */
void opa_vnic_encap_skb(struct opa_vnic_adapter *adapter, struct sk_buff *skb)
{
struct __opa_veswport_info *info = &adapter->info;
struct opa_vnic_skb_mdata *mdata;
u8 def_port, sc, entropy, *hdr;
u16 len, l4_hdr;
u32 dlid;
hdr = skb_push(skb, OPA_VNIC_HDR_LEN);
entropy = opa_vnic_calc_entropy(adapter, skb);
def_port = opa_vnic_get_def_port(adapter, entropy);
len = opa_vnic_wire_length(skb);
dlid = opa_vnic_get_dlid(adapter, skb, def_port);
sc = opa_vnic_get_sc(info, skb);
l4_hdr = info->vesw.vesw_id;
mdata = (struct opa_vnic_skb_mdata *)skb_push(skb, sizeof(*mdata));
mdata->vl = opa_vnic_get_vl(adapter, skb);
mdata->entropy = entropy;
mdata->flags = 0;
if (unlikely(!dlid)) {
mdata->flags = OPA_VNIC_SKB_MDATA_ENCAP_ERR;
return;
}
opa_vnic_make_header(hdr, info->vport.encap_slid, dlid, len,
info->vesw.pkey, entropy, sc, 0,
OPA_VNIC_L4_ETHR, l4_hdr);
}
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