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8ab79ed50c
Convert netmem to be a union of struct page and struct netmem. Overload
the LSB of struct netmem* to indicate that it's a net_iov, otherwise
it's a page.
Currently these entries in struct page are rented by the page_pool and
used exclusively by the net stack:
struct {
unsigned long pp_magic;
struct page_pool *pp;
unsigned long _pp_mapping_pad;
unsigned long dma_addr;
atomic_long_t pp_ref_count;
};
Mirror these (and only these) entries into struct net_iov and implement
netmem helpers that can access these common fields regardless of
whether the underlying type is page or net_iov.
Implement checks for net_iov in netmem helpers which delegate to mm
APIs, to ensure net_iov are never passed to the mm stack.
Signed-off-by: Mina Almasry <almasrymina@google.com>
Reviewed-by: Pavel Begunkov <asml.silence@gmail.com>
Acked-by: Jakub Kicinski <kuba@kernel.org>
Link: https://patch.msgid.link/20240910171458.219195-6-almasrymina@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
120 lines
2.8 KiB
C
120 lines
2.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#undef TRACE_SYSTEM
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#define TRACE_SYSTEM page_pool
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#if !defined(_TRACE_PAGE_POOL_H) || defined(TRACE_HEADER_MULTI_READ)
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#define _TRACE_PAGE_POOL_H
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#include <linux/types.h>
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#include <linux/tracepoint.h>
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#include <trace/events/mmflags.h>
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#include <net/page_pool/types.h>
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TRACE_EVENT(page_pool_release,
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TP_PROTO(const struct page_pool *pool,
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s32 inflight, u32 hold, u32 release),
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TP_ARGS(pool, inflight, hold, release),
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TP_STRUCT__entry(
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__field(const struct page_pool *, pool)
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__field(s32, inflight)
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__field(u32, hold)
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__field(u32, release)
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__field(u64, cnt)
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),
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TP_fast_assign(
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__entry->pool = pool;
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__entry->inflight = inflight;
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__entry->hold = hold;
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__entry->release = release;
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__entry->cnt = pool->destroy_cnt;
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),
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TP_printk("page_pool=%p inflight=%d hold=%u release=%u cnt=%llu",
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__entry->pool, __entry->inflight, __entry->hold,
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__entry->release, __entry->cnt)
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);
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TRACE_EVENT(page_pool_state_release,
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TP_PROTO(const struct page_pool *pool,
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netmem_ref netmem, u32 release),
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TP_ARGS(pool, netmem, release),
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TP_STRUCT__entry(
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__field(const struct page_pool *, pool)
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__field(unsigned long, netmem)
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__field(u32, release)
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__field(unsigned long, pfn)
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),
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TP_fast_assign(
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__entry->pool = pool;
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__entry->netmem = (__force unsigned long)netmem;
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__entry->release = release;
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__entry->pfn = netmem_pfn_trace(netmem);
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),
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TP_printk("page_pool=%p netmem=%p is_net_iov=%lu pfn=0x%lx release=%u",
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__entry->pool, (void *)__entry->netmem,
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__entry->netmem & NET_IOV, __entry->pfn, __entry->release)
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);
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TRACE_EVENT(page_pool_state_hold,
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TP_PROTO(const struct page_pool *pool,
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netmem_ref netmem, u32 hold),
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TP_ARGS(pool, netmem, hold),
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TP_STRUCT__entry(
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__field(const struct page_pool *, pool)
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__field(unsigned long, netmem)
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__field(u32, hold)
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__field(unsigned long, pfn)
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),
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TP_fast_assign(
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__entry->pool = pool;
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__entry->netmem = (__force unsigned long)netmem;
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__entry->hold = hold;
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__entry->pfn = netmem_pfn_trace(netmem);
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),
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TP_printk("page_pool=%p netmem=%p is_net_iov=%lu, pfn=0x%lx hold=%u",
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__entry->pool, (void *)__entry->netmem,
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__entry->netmem & NET_IOV, __entry->pfn, __entry->hold)
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);
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TRACE_EVENT(page_pool_update_nid,
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TP_PROTO(const struct page_pool *pool, int new_nid),
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TP_ARGS(pool, new_nid),
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TP_STRUCT__entry(
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__field(const struct page_pool *, pool)
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__field(int, pool_nid)
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__field(int, new_nid)
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),
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TP_fast_assign(
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__entry->pool = pool;
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__entry->pool_nid = pool->p.nid;
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__entry->new_nid = new_nid;
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),
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TP_printk("page_pool=%p pool_nid=%d new_nid=%d",
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__entry->pool, __entry->pool_nid, __entry->new_nid)
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);
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#endif /* _TRACE_PAGE_POOL_H */
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/* This part must be outside protection */
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#include <trace/define_trace.h>
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