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Date: Mon, 05 Apr 2010 15:54:56 +0900
From: Koki Sanagi <sanagi.koki@...fujitsu.com>
To: netdev@...r.kernel.org
CC: izumi.taku@...fujitsu.com, kaneshige.kenji@...fujitsu.com,
davem@...emloft.net, nhorman@...driver.com,
jeffrey.t.kirsher@...el.com, jesse.brandeburg@...el.com,
bruce.w.allan@...el.com, alexander.h.duyck@...el.com,
peter.p.waskiewicz.jr@...el.com, john.ronciak@...el.com
Subject: [RFC PATCH 2/2] netdev: an usage example on igb
This patch is usage example of previous patch's buffer on igb.
The output is like below.
# cat /sys/kernel/debug/ndrvbuf/igb-trace-0000\:03\:00.0/buffer
[ 1] 50462.369207: clean_tx qidx=1 ntu=154->156
[ 0] 50462.369241: clean_rx qidx=0 ntu=111->112
[ 0] 50462.369250: xmit qidx=1 ntu=156->158
[ 1] 50462.369256: clean_tx qidx=1 ntu=156->158
[ 1] 50462.369342: clean_rx qidx=0 ntu=113->114
[ 1] 50462.369439: clean_rx qidx=0 ntu=114->115
This example outputs original print style, because it sets original print
function(igb_trace_read) when registered.
register_ndrvbuf(buname, 1000000, igb_trace_read);
If you set NULL to arg3, outputs by ndrvbuf default style.
If you set 0 to size(arg2), recording is disabled at first(but small buffer is
alloced).
When you set non-zero to size, recording becomes enabled.
Signed-off-by: Koki Sanagi <sanagi.koki@...fujitsu.com>
---
drivers/net/igb/Makefile | 2 +-
drivers/net/igb/igb.h | 1 +
drivers/net/igb/igb_main.c | 10 +++++-
drivers/net/igb/igb_trace.c | 81 +++++++++++++++++++++++++++++++++++++++++++
drivers/net/igb/igb_trace.h | 21 +++++++++++
5 files changed, 113 insertions(+), 2 deletions(-)
diff --git a/drivers/net/igb/Makefile b/drivers/net/igb/Makefile
index 8372cb9..286541e 100644
--- a/drivers/net/igb/Makefile
+++ b/drivers/net/igb/Makefile
@@ -33,5 +33,5 @@
obj-$(CONFIG_IGB) += igb.o
igb-objs := igb_main.o igb_ethtool.o e1000_82575.o \
- e1000_mac.o e1000_nvm.o e1000_phy.o e1000_mbx.o
+ e1000_mac.o e1000_nvm.o e1000_phy.o e1000_mbx.o igb_trace.o
diff --git a/drivers/net/igb/igb.h b/drivers/net/igb/igb.h
index a177570..533c5e6 100644
--- a/drivers/net/igb/igb.h
+++ b/drivers/net/igb/igb.h
@@ -315,6 +315,7 @@ struct igb_adapter {
unsigned int vfs_allocated_count;
struct vf_data_storage *vf_data;
u32 rss_queues;
+ struct ndrvbuf *trace;
};
#define IGB_FLAG_HAS_MSI (1 << 0)
diff --git a/drivers/net/igb/igb_main.c b/drivers/net/igb/igb_main.c
index 583a21c..f754fd1 100644
--- a/drivers/net/igb/igb_main.c
+++ b/drivers/net/igb/igb_main.c
@@ -48,6 +48,7 @@
#include <linux/dca.h>
#endif
#include "igb.h"
+#include "igb_trace.h"
#define DRV_VERSION "2.1.0-k2"
char igb_driver_name[] = "igb";
@@ -1412,6 +1413,7 @@ static int __devinit igb_probe(struct pci_dev *pdev,
int err, pci_using_dac;
u16 eeprom_apme_mask = IGB_EEPROM_APME;
u32 part_num;
+ char bufname[NDRVBUF_NAME_SIZE];
err = pci_enable_device_mem(pdev);
if (err)
@@ -1674,6 +1676,8 @@ static int __devinit igb_probe(struct pci_dev *pdev,
(adapter->flags & IGB_FLAG_HAS_MSI) ? "MSI" : "legacy",
adapter->num_rx_queues, adapter->num_tx_queues);
+ sprintf(bufname, "igb-trace-%s", pci_name(pdev));
+ adapter->trace = register_ndrvbuf(bufname, 1000000, igb_trace_read);
return 0;
err_register:
@@ -1734,6 +1738,7 @@ static void __devexit igb_remove(struct pci_dev *pdev)
* would have already happened in close and is redundant. */
igb_release_hw_control(adapter);
+ unregister_ndrvbuf(adapter->trace);
unregister_netdev(netdev);
igb_clear_interrupt_scheme(adapter);
@@ -3814,6 +3819,7 @@ netdev_tx_t igb_xmit_frame_ring_adv(struct sk_buff *skb,
}
igb_tx_queue_adv(tx_ring, tx_flags, count, skb->len, hdr_len);
+ igb_trace_write_xmit(adapter->trace, tx_ring, first);
/* Make sure there is space in the ring for the next send. */
igb_maybe_stop_tx(tx_ring, MAX_SKB_FRAGS + 4);
@@ -5039,7 +5045,7 @@ static bool igb_clean_tx_irq(struct igb_q_vector *q_vector)
eop = tx_ring->buffer_info[i].next_to_watch;
eop_desc = E1000_TX_DESC_ADV(*tx_ring, eop);
}
-
+ igb_trace_write_clean_tx(adapter->trace, tx_ring, i);
tx_ring->next_to_clean = i;
if (unlikely(count &&
@@ -5195,6 +5201,7 @@ static bool igb_clean_rx_irq_adv(struct igb_q_vector *q_vector,
{
struct igb_ring *rx_ring = q_vector->rx_ring;
struct net_device *netdev = rx_ring->netdev;
+ struct igb_adapter *adapter = netdev_priv(netdev);
struct pci_dev *pdev = rx_ring->pdev;
union e1000_adv_rx_desc *rx_desc , *next_rxd;
struct igb_buffer *buffer_info , *next_buffer;
@@ -5309,6 +5316,7 @@ next_desc:
staterr = le32_to_cpu(rx_desc->wb.upper.status_error);
}
+ igb_trace_write_clean_rx(adapter->trace, rx_ring, i);
rx_ring->next_to_clean = i;
cleaned_count = igb_desc_unused(rx_ring);
diff --git a/drivers/net/igb/igb_trace.c b/drivers/net/igb/igb_trace.c
new file mode 100644
index 0000000..ab96300
--- /dev/null
+++ b/drivers/net/igb/igb_trace.c
@@ -0,0 +1,81 @@
+#include "igb_trace.h"
+
+struct trace_data_common {
+ unsigned short type;
+ u8 qidx;
+ int from;
+ int to;
+};
+
+void igb_trace_write_xmit(struct ndrvbuf *ndrvbuf,
+ struct igb_ring *tx_ring, int i)
+{
+ struct trace_data_common tdata;
+
+ tdata.type = IGB_TRACE_EVENT_XMIT;
+ tdata.qidx = tx_ring->queue_index;
+ tdata.from = i;
+ tdata.to = tx_ring->next_to_use;
+
+ write_ndrvbuf(ndrvbuf, sizeof(struct trace_data_common), &tdata);
+}
+
+void igb_trace_write_clean_tx(struct ndrvbuf *ndrvbuf,
+ struct igb_ring *tx_ring, int i)
+{
+ struct trace_data_common tdata;
+
+ tdata.type = IGB_TRACE_EVENT_CLEAN_TX;
+ tdata.qidx = tx_ring->queue_index;
+ tdata.from = tx_ring->next_to_clean;
+ tdata.to = i;
+
+ write_ndrvbuf(ndrvbuf, sizeof(struct trace_data_common), &tdata);
+}
+
+void igb_trace_write_clean_rx(struct ndrvbuf *ndrvbuf,
+ struct igb_ring *rx_ring, int i)
+{
+ struct trace_data_common tdata;
+
+ tdata.type = IGB_TRACE_EVENT_CLEAN_RX;
+ tdata.qidx = rx_ring->queue_index;
+ tdata.from = rx_ring->next_to_clean;
+ tdata.to = i;
+
+ write_ndrvbuf(ndrvbuf, sizeof(struct trace_data_common), &tdata);
+}
+
+size_t igb_trace_read(void *ubuf, size_t bufsize, void *entry,
+ size_t size, int cpu, u64 ts)
+{
+ struct trace_data_common *tdata = entry;
+ int bufpos = 0;
+ size_t headlen;
+
+ headlen = typical_ndrvbuf_header(ubuf, bufsize, cpu, ts);
+ bufpos += headlen;
+
+ switch (tdata->type) {
+ case IGB_TRACE_EVENT_XMIT:
+ bufpos += snprintf(ubuf + bufpos, bufsize - bufpos,
+ "xmit qidx=%u ntu=%d->%d\n",
+ tdata->qidx, tdata->from, tdata->to);
+ break;
+ case IGB_TRACE_EVENT_CLEAN_TX:
+ bufpos += snprintf(ubuf + bufpos, bufsize - bufpos,
+ "clean_tx qidx=%u ntu=%d->%d\n",
+ tdata->qidx, tdata->from, tdata->to);
+ break;
+ case IGB_TRACE_EVENT_CLEAN_RX:
+ bufpos += snprintf(ubuf + bufpos, bufsize - bufpos,
+ "clean_rx qidx=%u ntu=%d->%d\n",
+ tdata->qidx, tdata->from, tdata->to);
+ break;
+ default:
+ bufpos += snprintf(ubuf + bufpos, bufsize - bufpos,
+ "EVENT ID:%u is not defined\n",
+ tdata->type);
+ }
+ return bufpos;
+}
diff --git a/drivers/net/igb/igb_trace.h b/drivers/net/igb/igb_trace.h
new file mode 100644
index 0000000..fa130e1
--- /dev/null
+++ b/drivers/net/igb/igb_trace.h
@@ -0,0 +1,21 @@
+#ifndef _IGB_TRACE_H_
+#define _IGB_TRACE_H_
+
+#include <linux/ndrvbuf.h>
+#include "igb.h"
+
+#define IGB_TRACE_EVENT_XMIT 0x01
+#define IGB_TRACE_EVENT_CLEAN_TX 0x02
+#define IGB_TRACE_EVENT_CLEAN_RX 0x03
+
+extern void igb_trace_write_xmit(struct ndrvbuf *ndrvbuf,
+ struct igb_ring *tx_ring, int i);
+extern void igb_trace_write_clean_tx(struct ndrvbuf *ndrvbuf,
+ struct igb_ring *tx_ring, int i);
+extern void igb_trace_write_clean_rx(struct ndrvbuf *ndrvbuf,
+ struct igb_ring *rx_ring, int i);
+
+extern size_t igb_trace_read(void *ubuf, size_t bufsize, void *entry,
+ size_t size, int cpu, u64 ts);
+
+#endif /*_IGB_TRACE_H_*/
--
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