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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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0192e7d46c
There is an unalignment access about the structure
'trace_event_raw_fib_table_lookup'.
In include/trace/events/fib.h, there is a memory operation which casting
the 'src' data member to a pointer, and then store a value to this
pointer point to.
p32 = (__be32 *) __entry->src;
*p32 = flp->saddr;
The offset of 'src' in structure trace_event_raw_fib_table_lookup is not
four bytes alignment. On some architectures, they don't permit the
unalignment access, it need to pay the price to handle this situation in
exception handler.
Adjust the layout of structure to avoid this case.
Fixes: 9f323973c9 ("net/ipv4: Udate fib_table_lookup tracepoint")
Signed-off-by: Zong Li <zong@andestech.com>
Acked-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
94 lines
2.2 KiB
C
94 lines
2.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#undef TRACE_SYSTEM
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#define TRACE_SYSTEM fib
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#if !defined(_TRACE_FIB_H) || defined(TRACE_HEADER_MULTI_READ)
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#define _TRACE_FIB_H
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#include <linux/skbuff.h>
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#include <linux/netdevice.h>
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#include <net/ip_fib.h>
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#include <linux/tracepoint.h>
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TRACE_EVENT(fib_table_lookup,
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TP_PROTO(u32 tb_id, const struct flowi4 *flp,
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const struct fib_nh *nh, int err),
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TP_ARGS(tb_id, flp, nh, err),
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TP_STRUCT__entry(
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__field( u32, tb_id )
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__field( int, err )
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__field( int, oif )
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__field( int, iif )
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__field( u8, proto )
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__field( __u8, tos )
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__field( __u8, scope )
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__field( __u8, flags )
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__array( __u8, src, 4 )
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__array( __u8, dst, 4 )
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__array( __u8, gw, 4 )
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__array( __u8, saddr, 4 )
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__field( u16, sport )
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__field( u16, dport )
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__dynamic_array(char, name, IFNAMSIZ )
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),
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TP_fast_assign(
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__be32 *p32;
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__entry->tb_id = tb_id;
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__entry->err = err;
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__entry->oif = flp->flowi4_oif;
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__entry->iif = flp->flowi4_iif;
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__entry->tos = flp->flowi4_tos;
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__entry->scope = flp->flowi4_scope;
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__entry->flags = flp->flowi4_flags;
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p32 = (__be32 *) __entry->src;
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*p32 = flp->saddr;
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p32 = (__be32 *) __entry->dst;
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*p32 = flp->daddr;
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__entry->proto = flp->flowi4_proto;
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if (__entry->proto == IPPROTO_TCP ||
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__entry->proto == IPPROTO_UDP) {
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__entry->sport = ntohs(flp->fl4_sport);
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__entry->dport = ntohs(flp->fl4_dport);
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} else {
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__entry->sport = 0;
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__entry->dport = 0;
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}
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if (nh) {
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p32 = (__be32 *) __entry->saddr;
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*p32 = nh->nh_saddr;
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p32 = (__be32 *) __entry->gw;
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*p32 = nh->nh_gw;
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__assign_str(name, nh->nh_dev ? nh->nh_dev->name : "-");
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} else {
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p32 = (__be32 *) __entry->saddr;
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*p32 = 0;
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p32 = (__be32 *) __entry->gw;
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*p32 = 0;
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__assign_str(name, "-");
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}
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),
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TP_printk("table %u oif %d iif %d proto %u %pI4/%u -> %pI4/%u tos %d scope %d flags %x ==> dev %s gw %pI4 src %pI4 err %d",
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__entry->tb_id, __entry->oif, __entry->iif, __entry->proto,
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__entry->src, __entry->sport, __entry->dst, __entry->dport,
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__entry->tos, __entry->scope, __entry->flags,
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__get_str(name), __entry->gw, __entry->saddr, __entry->err)
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);
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#endif /* _TRACE_FIB_H */
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/* This part must be outside protection */
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#include <trace/define_trace.h>
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