net/rds/ib_stats.c
Source file repositories/reference/linux-study-clean/net/rds/ib_stats.c
File Facts
- System
- Linux kernel
- Corpus path
net/rds/ib_stats.c- Extension
.c- Size
- 3181 bytes
- Lines
- 108
- Domain
- Networking Core
- Bucket
- Sockets, Protocols, Packet Path, And Network Policy
- Inferred role
- Networking Core: implementation source
- Status
- source implementation candidate
Why This File Exists
Networking stack implementation surface: socket APIs, protocol dispatch, packet flow, routing, filtering, and network namespaces.
- Networking stack implementation surface: socket APIs, protocol dispatch, packet flow, routing, filtering, and network namespaces.
- Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
- Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.
Dependency Surface
linux/percpu.hlinux/seq_file.hlinux/proc_fs.hrds.hib.h
Detected Declarations
function rds_ib_stats_info_copyfunction for_each_online_cpu
Annotated Snippet
#include <linux/percpu.h>
#include <linux/seq_file.h>
#include <linux/proc_fs.h>
#include "rds.h"
#include "ib.h"
DEFINE_PER_CPU_SHARED_ALIGNED(struct rds_ib_statistics, rds_ib_stats);
static const char *const rds_ib_stat_names[] = {
"ib_connect_raced",
"ib_listen_closed_stale",
"ib_evt_handler_call",
"ib_tasklet_call",
"ib_tx_cq_event",
"ib_tx_ring_full",
"ib_tx_throttle",
"ib_tx_sg_mapping_failure",
"ib_tx_stalled",
"ib_tx_credit_updates",
"ib_rx_cq_event",
"ib_rx_ring_empty",
"ib_rx_refill_from_cq",
"ib_rx_refill_from_thread",
"ib_rx_alloc_limit",
"ib_rx_total_frags",
"ib_rx_total_incs",
"ib_rx_credit_updates",
"ib_ack_sent",
"ib_ack_send_failure",
"ib_ack_send_delayed",
"ib_ack_send_piggybacked",
"ib_ack_received",
"ib_rdma_mr_8k_alloc",
"ib_rdma_mr_8k_free",
"ib_rdma_mr_8k_used",
"ib_rdma_mr_8k_pool_flush",
"ib_rdma_mr_8k_pool_wait",
"ib_rdma_mr_8k_pool_depleted",
"ib_rdma_mr_1m_alloc",
"ib_rdma_mr_1m_free",
"ib_rdma_mr_1m_used",
"ib_rdma_mr_1m_pool_flush",
"ib_rdma_mr_1m_pool_wait",
"ib_rdma_mr_1m_pool_depleted",
"ib_rdma_mr_8k_reused",
"ib_rdma_mr_1m_reused",
"ib_atomic_cswp",
"ib_atomic_fadd",
};
unsigned int rds_ib_stats_info_copy(struct rds_info_iterator *iter,
unsigned int avail)
{
struct rds_ib_statistics stats = {0, };
uint64_t *src;
uint64_t *sum;
size_t i;
int cpu;
if (avail < ARRAY_SIZE(rds_ib_stat_names))
goto out;
for_each_online_cpu(cpu) {
src = (uint64_t *)&(per_cpu(rds_ib_stats, cpu));
sum = (uint64_t *)&stats;
for (i = 0; i < sizeof(stats) / sizeof(uint64_t); i++)
*(sum++) += *(src++);
}
rds_stats_info_copy(iter, (uint64_t *)&stats, rds_ib_stat_names,
ARRAY_SIZE(rds_ib_stat_names));
out:
return ARRAY_SIZE(rds_ib_stat_names);
}
Annotation
- Immediate include surface: `linux/percpu.h`, `linux/seq_file.h`, `linux/proc_fs.h`, `rds.h`, `ib.h`.
- Detected declarations: `function rds_ib_stats_info_copy`, `function for_each_online_cpu`.
- Atlas domain: Networking Core / Sockets, Protocols, Packet Path, And Network Policy.
- Implementation status: source implementation candidate.
- Synchronization appears in or near this file; preserve lock ordering, sleepability, and interrupt-context constraints.
Implementation Notes
- This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
- Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
- Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.