Revision 10717f45639f6c1bc27b56405252c3a027406d92 authored by Trond Myklebust on 27 January 2020, 14:58:19 UTC, committed by Anna Schumaker on 03 February 2020, 21:35:07 UTC
Delegations can be expensive to return, and can cause scalability issues for the server. Let's therefore try to limit the number of inactive delegations we hold. Once the number of delegations is above a certain threshold, start to return them on close. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
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ife.c
/*
* net/ife/ife.c - Inter-FE protocol based on ForCES WG InterFE LFB
* Copyright (c) 2015 Jamal Hadi Salim <jhs@mojatatu.com>
* Copyright (c) 2017 Yotam Gigi <yotamg@mellanox.com>
*
* Refer to: draft-ietf-forces-interfelfb-03 and netdev01 paper:
* "Distributing Linux Traffic Control Classifier-Action Subsystem"
* Authors: Jamal Hadi Salim and Damascene M. Joachimpillai
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation.
*/
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/skbuff.h>
#include <linux/rtnetlink.h>
#include <linux/module.h>
#include <linux/init.h>
#include <net/net_namespace.h>
#include <net/netlink.h>
#include <net/pkt_sched.h>
#include <linux/etherdevice.h>
#include <net/ife.h>
struct ifeheadr {
__be16 metalen;
u8 tlv_data[];
};
void *ife_encode(struct sk_buff *skb, u16 metalen)
{
/* OUTERHDR:TOTMETALEN:{TLVHDR:Metadatum:TLVHDR..}:ORIGDATA
* where ORIGDATA = original ethernet header ...
*/
int hdrm = metalen + IFE_METAHDRLEN;
int total_push = hdrm + skb->dev->hard_header_len;
struct ifeheadr *ifehdr;
struct ethhdr *iethh; /* inner ether header */
int skboff = 0;
int err;
err = skb_cow_head(skb, total_push);
if (unlikely(err))
return NULL;
iethh = (struct ethhdr *) skb->data;
__skb_push(skb, total_push);
memcpy(skb->data, iethh, skb->dev->hard_header_len);
skb_reset_mac_header(skb);
skboff += skb->dev->hard_header_len;
/* total metadata length */
ifehdr = (struct ifeheadr *) (skb->data + skboff);
metalen += IFE_METAHDRLEN;
ifehdr->metalen = htons(metalen);
return ifehdr->tlv_data;
}
EXPORT_SYMBOL_GPL(ife_encode);
void *ife_decode(struct sk_buff *skb, u16 *metalen)
{
struct ifeheadr *ifehdr;
int total_pull;
u16 ifehdrln;
if (!pskb_may_pull(skb, skb->dev->hard_header_len + IFE_METAHDRLEN))
return NULL;
ifehdr = (struct ifeheadr *) (skb->data + skb->dev->hard_header_len);
ifehdrln = ntohs(ifehdr->metalen);
total_pull = skb->dev->hard_header_len + ifehdrln;
if (unlikely(ifehdrln < 2))
return NULL;
if (unlikely(!pskb_may_pull(skb, total_pull)))
return NULL;
skb_set_mac_header(skb, total_pull);
__skb_pull(skb, total_pull);
*metalen = ifehdrln - IFE_METAHDRLEN;
return &ifehdr->tlv_data;
}
EXPORT_SYMBOL_GPL(ife_decode);
struct meta_tlvhdr {
__be16 type;
__be16 len;
};
static bool __ife_tlv_meta_valid(const unsigned char *skbdata,
const unsigned char *ifehdr_end)
{
const struct meta_tlvhdr *tlv;
u16 tlvlen;
if (unlikely(skbdata + sizeof(*tlv) > ifehdr_end))
return false;
tlv = (const struct meta_tlvhdr *)skbdata;
tlvlen = ntohs(tlv->len);
/* tlv length field is inc header, check on minimum */
if (tlvlen < NLA_HDRLEN)
return false;
/* overflow by NLA_ALIGN check */
if (NLA_ALIGN(tlvlen) < tlvlen)
return false;
if (unlikely(skbdata + NLA_ALIGN(tlvlen) > ifehdr_end))
return false;
return true;
}
/* Caller takes care of presenting data in network order
*/
void *ife_tlv_meta_decode(void *skbdata, const void *ifehdr_end, u16 *attrtype,
u16 *dlen, u16 *totlen)
{
struct meta_tlvhdr *tlv;
if (!__ife_tlv_meta_valid(skbdata, ifehdr_end))
return NULL;
tlv = (struct meta_tlvhdr *)skbdata;
*dlen = ntohs(tlv->len) - NLA_HDRLEN;
*attrtype = ntohs(tlv->type);
if (totlen)
*totlen = nla_total_size(*dlen);
return skbdata + sizeof(struct meta_tlvhdr);
}
EXPORT_SYMBOL_GPL(ife_tlv_meta_decode);
void *ife_tlv_meta_next(void *skbdata)
{
struct meta_tlvhdr *tlv = (struct meta_tlvhdr *) skbdata;
u16 tlvlen = ntohs(tlv->len);
tlvlen = NLA_ALIGN(tlvlen);
return skbdata + tlvlen;
}
EXPORT_SYMBOL_GPL(ife_tlv_meta_next);
/* Caller takes care of presenting data in network order
*/
int ife_tlv_meta_encode(void *skbdata, u16 attrtype, u16 dlen, const void *dval)
{
__be32 *tlv = (__be32 *) (skbdata);
u16 totlen = nla_total_size(dlen); /*alignment + hdr */
char *dptr = (char *) tlv + NLA_HDRLEN;
u32 htlv = attrtype << 16 | (dlen + NLA_HDRLEN);
*tlv = htonl(htlv);
memset(dptr, 0, totlen - NLA_HDRLEN);
memcpy(dptr, dval, dlen);
return totlen;
}
EXPORT_SYMBOL_GPL(ife_tlv_meta_encode);
MODULE_AUTHOR("Jamal Hadi Salim <jhs@mojatatu.com>");
MODULE_AUTHOR("Yotam Gigi <yotam.gi@gmail.com>");
MODULE_DESCRIPTION("Inter-FE LFB action");
MODULE_LICENSE("GPL");
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