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xdp: add tracepoints for XDP mem

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These tracepoints make it easier to troubleshoot XDP mem id disconnect.

The xdp:mem_disconnect tracepoint cannot be replaced via kprobe. It is
placed at the last stable place for the pointer to struct xdp_mem_allocator,
just before it's scheduled for RCU removal. It also extract info on
'safe_to_remove' and 'force'.

Detailed info about in-flight pages is not available at this layer. The next
patch will added tracepoints needed at the page_pool layer for this.

Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jesper Dangaard Brouer
2019-06-18 15:05:58 +02:00
committed by David S. Miller
parent d956a048cd
commit f033b688c1
3 changed files with 143 additions and 16 deletions
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23
include/net/xdp_priv.h Normal file
View File

@@ -0,0 +1,23 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __LINUX_NET_XDP_PRIV_H__
#define __LINUX_NET_XDP_PRIV_H__
#include <linux/rhashtable.h>
/* Private to net/core/xdp.c, but used by trace/events/xdp.h */
struct xdp_mem_allocator {
struct xdp_mem_info mem;
union {
void *allocator;
struct page_pool *page_pool;
struct zero_copy_allocator *zc_alloc;
};
int disconnect_cnt;
unsigned long defer_start;
struct rhash_head node;
struct rcu_head rcu;
struct delayed_work defer_wq;
unsigned long defer_warn;
};
#endif /* __LINUX_NET_XDP_PRIV_H__ */