mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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1776658da8
The current codebase makes use of the zero-length array language
extension to the C90 standard, but the preferred mechanism to declare
variable-length types such as these ones is a flexible array member[1][2],
introduced in C99:
struct foo {
int stuff;
struct boo array[];
};
By making use of the mechanism above, we will get a compiler warning
in case the flexible array does not occur last in the structure, which
will help us prevent some kind of undefined behavior bugs from being
inadvertently introduced[3] to the codebase from now on.
Also, notice that, dynamic memory allocations won't be affected by
this change:
"Flexible array members have incomplete type, and so the sizeof operator
may not be applied. As a quirk of the original implementation of
zero-length arrays, sizeof evaluates to zero."[1]
This issue was found with the help of Coccinelle.
[1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
[2] https://github.com/KSPP/linux/issues/21
[3] commit 7649773293 ("cxgb3/l2t: Fix undefined behaviour")
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
133 lines
2.8 KiB
C
133 lines
2.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
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#ifndef __NET_DROPMON_H
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#define __NET_DROPMON_H
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#include <linux/types.h>
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#include <linux/netlink.h>
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struct net_dm_drop_point {
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__u8 pc[8];
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__u32 count;
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};
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#define is_drop_point_hw(x) do {\
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int ____i, ____j;\
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for (____i = 0; ____i < 8; i ____i++)\
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____j |= x[____i];\
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____j;\
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} while (0)
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#define NET_DM_CFG_VERSION 0
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#define NET_DM_CFG_ALERT_COUNT 1
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#define NET_DM_CFG_ALERT_DELAY 2
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#define NET_DM_CFG_MAX 3
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struct net_dm_config_entry {
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__u32 type;
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__u64 data __attribute__((aligned(8)));
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};
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struct net_dm_config_msg {
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__u32 entries;
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struct net_dm_config_entry options[];
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};
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struct net_dm_alert_msg {
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__u32 entries;
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struct net_dm_drop_point points[];
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};
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struct net_dm_user_msg {
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union {
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struct net_dm_config_msg user;
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struct net_dm_alert_msg alert;
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} u;
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};
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/* These are the netlink message types for this protocol */
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enum {
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NET_DM_CMD_UNSPEC = 0,
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NET_DM_CMD_ALERT,
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NET_DM_CMD_CONFIG,
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NET_DM_CMD_START,
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NET_DM_CMD_STOP,
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NET_DM_CMD_PACKET_ALERT,
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NET_DM_CMD_CONFIG_GET,
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NET_DM_CMD_CONFIG_NEW,
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NET_DM_CMD_STATS_GET,
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NET_DM_CMD_STATS_NEW,
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_NET_DM_CMD_MAX,
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};
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#define NET_DM_CMD_MAX (_NET_DM_CMD_MAX - 1)
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/*
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* Our group identifiers
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*/
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#define NET_DM_GRP_ALERT 1
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enum net_dm_attr {
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NET_DM_ATTR_UNSPEC,
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NET_DM_ATTR_ALERT_MODE, /* u8 */
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NET_DM_ATTR_PC, /* u64 */
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NET_DM_ATTR_SYMBOL, /* string */
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NET_DM_ATTR_IN_PORT, /* nested */
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NET_DM_ATTR_TIMESTAMP, /* u64 */
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NET_DM_ATTR_PROTO, /* u16 */
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NET_DM_ATTR_PAYLOAD, /* binary */
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NET_DM_ATTR_PAD,
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NET_DM_ATTR_TRUNC_LEN, /* u32 */
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NET_DM_ATTR_ORIG_LEN, /* u32 */
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NET_DM_ATTR_QUEUE_LEN, /* u32 */
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NET_DM_ATTR_STATS, /* nested */
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NET_DM_ATTR_HW_STATS, /* nested */
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NET_DM_ATTR_ORIGIN, /* u16 */
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NET_DM_ATTR_HW_TRAP_GROUP_NAME, /* string */
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NET_DM_ATTR_HW_TRAP_NAME, /* string */
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NET_DM_ATTR_HW_ENTRIES, /* nested */
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NET_DM_ATTR_HW_ENTRY, /* nested */
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NET_DM_ATTR_HW_TRAP_COUNT, /* u32 */
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NET_DM_ATTR_SW_DROPS, /* flag */
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NET_DM_ATTR_HW_DROPS, /* flag */
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NET_DM_ATTR_FLOW_ACTION_COOKIE, /* binary */
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__NET_DM_ATTR_MAX,
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NET_DM_ATTR_MAX = __NET_DM_ATTR_MAX - 1
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};
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/**
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* enum net_dm_alert_mode - Alert mode.
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* @NET_DM_ALERT_MODE_SUMMARY: A summary of recent drops is sent to user space.
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* @NET_DM_ALERT_MODE_PACKET: Each dropped packet is sent to user space along
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* with metadata.
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*/
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enum net_dm_alert_mode {
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NET_DM_ALERT_MODE_SUMMARY,
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NET_DM_ALERT_MODE_PACKET,
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};
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enum {
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NET_DM_ATTR_PORT_NETDEV_IFINDEX, /* u32 */
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NET_DM_ATTR_PORT_NETDEV_NAME, /* string */
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__NET_DM_ATTR_PORT_MAX,
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NET_DM_ATTR_PORT_MAX = __NET_DM_ATTR_PORT_MAX - 1
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};
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enum {
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NET_DM_ATTR_STATS_DROPPED, /* u64 */
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__NET_DM_ATTR_STATS_MAX,
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NET_DM_ATTR_STATS_MAX = __NET_DM_ATTR_STATS_MAX - 1
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};
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enum net_dm_origin {
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NET_DM_ORIGIN_SW,
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NET_DM_ORIGIN_HW,
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};
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#endif
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