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-rw-r--r--Documentation/networking/device_drivers/ethernet/meta/fbnic.rst30
-rw-r--r--drivers/net/ethernet/meta/fbnic/fbnic_csr.h37
-rw-r--r--drivers/net/ethernet/meta/fbnic/fbnic_debugfs.c34
-rw-r--r--drivers/net/ethernet/meta/fbnic/fbnic_hw_stats.c114
-rw-r--r--drivers/net/ethernet/meta/fbnic/fbnic_hw_stats.h12
-rw-r--r--drivers/net/ethernet/meta/fbnic/fbnic_pci.c4
6 files changed, 231 insertions, 0 deletions
diff --git a/Documentation/networking/device_drivers/ethernet/meta/fbnic.rst b/Documentation/networking/device_drivers/ethernet/meta/fbnic.rst
index 32ff114f5c26..14f2834d86d1 100644
--- a/Documentation/networking/device_drivers/ethernet/meta/fbnic.rst
+++ b/Documentation/networking/device_drivers/ethernet/meta/fbnic.rst
@@ -27,3 +27,33 @@ driver takes over.
devlink dev info provides version information for all three components. In
addition to the version the hg commit hash of the build is included as a
separate entry.
+
+Statistics
+----------
+
+PCIe
+~~~~
+
+The fbnic driver exposes PCIe hardware performance statistics through debugfs
+(``pcie_stats``). These statistics provide insights into PCIe transaction
+behavior and potential performance bottlenecks.
+
+1. PCIe Transaction Counters:
+
+ These counters track PCIe transaction activity:
+ - ``pcie_ob_rd_tlp``: Outbound read Transaction Layer Packets count
+ - ``pcie_ob_rd_dword``: DWORDs transferred in outbound read transactions
+ - ``pcie_ob_wr_tlp``: Outbound write Transaction Layer Packets count
+ - ``pcie_ob_wr_dword``: DWORDs transferred in outbound write
+ transactions
+ - ``pcie_ob_cpl_tlp``: Outbound completion TLP count
+ - ``pcie_ob_cpl_dword``: DWORDs transferred in outbound completion TLPs
+
+2. PCIe Resource Monitoring:
+
+ These counters indicate PCIe resource exhaustion events:
+ - ``pcie_ob_rd_no_tag``: Read requests dropped due to tag unavailability
+ - ``pcie_ob_rd_no_cpl_cred``: Read requests dropped due to completion
+ credit exhaustion
+ - ``pcie_ob_rd_no_np_cred``: Read requests dropped due to non-posted
+ credit exhaustion
diff --git a/drivers/net/ethernet/meta/fbnic/fbnic_csr.h b/drivers/net/ethernet/meta/fbnic/fbnic_csr.h
index f9a531ce9e17..dac9a4879e52 100644
--- a/drivers/net/ethernet/meta/fbnic/fbnic_csr.h
+++ b/drivers/net/ethernet/meta/fbnic/fbnic_csr.h
@@ -918,6 +918,43 @@ enum {
#define FBNIC_MAX_QUEUES 128
#define FBNIC_CSR_END_QUEUE (0x40000 + 0x400 * FBNIC_MAX_QUEUES - 1)
+/* PUL User Registers*/
+#define FBNIC_PUL_USER_OB_RD_TLP_CNT_31_0 \
+ 0x3106e /* 0xc41b8 */
+#define FBNIC_PUL_USER_OB_RD_DWORD_CNT_31_0 \
+ 0x31070 /* 0xc41c0 */
+#define FBNIC_PUL_USER_OB_RD_DWORD_CNT_63_32 \
+ 0x31071 /* 0xc41c4 */
+#define FBNIC_PUL_USER_OB_WR_TLP_CNT_31_0 \
+ 0x31072 /* 0xc41c8 */
+#define FBNIC_PUL_USER_OB_WR_TLP_CNT_63_32 \
+ 0x31073 /* 0xc41cc */
+#define FBNIC_PUL_USER_OB_WR_DWORD_CNT_31_0 \
+ 0x31074 /* 0xc41d0 */
+#define FBNIC_PUL_USER_OB_WR_DWORD_CNT_63_32 \
+ 0x31075 /* 0xc41d4 */
+#define FBNIC_PUL_USER_OB_CPL_TLP_CNT_31_0 \
+ 0x31076 /* 0xc41d8 */
+#define FBNIC_PUL_USER_OB_CPL_TLP_CNT_63_32 \
+ 0x31077 /* 0xc41dc */
+#define FBNIC_PUL_USER_OB_CPL_DWORD_CNT_31_0 \
+ 0x31078 /* 0xc41e0 */
+#define FBNIC_PUL_USER_OB_CPL_DWORD_CNT_63_32 \
+ 0x31079 /* 0xc41e4 */
+#define FBNIC_PUL_USER_OB_RD_DBG_CNT_CPL_CRED_31_0 \
+ 0x3107a /* 0xc41e8 */
+#define FBNIC_PUL_USER_OB_RD_DBG_CNT_CPL_CRED_63_32 \
+ 0x3107b /* 0xc41ec */
+#define FBNIC_PUL_USER_OB_RD_DBG_CNT_TAG_31_0 \
+ 0x3107c /* 0xc41f0 */
+#define FBNIC_PUL_USER_OB_RD_DBG_CNT_TAG_63_32 \
+ 0x3107d /* 0xc41f4 */
+#define FBNIC_PUL_USER_OB_RD_DBG_CNT_NP_CRED_31_0 \
+ 0x3107e /* 0xc41f8 */
+#define FBNIC_PUL_USER_OB_RD_DBG_CNT_NP_CRED_63_32 \
+ 0x3107f /* 0xc41fc */
+#define FBNIC_CSR_END_PUL_USER 0x31080 /* CSR section delimiter */
+
/* BAR 4 CSRs */
/* The IPC mailbox consists of 32 mailboxes, with each mailbox consisting
diff --git a/drivers/net/ethernet/meta/fbnic/fbnic_debugfs.c b/drivers/net/ethernet/meta/fbnic/fbnic_debugfs.c
index 183c7c4914dc..59951b5abdb7 100644
--- a/drivers/net/ethernet/meta/fbnic/fbnic_debugfs.c
+++ b/drivers/net/ethernet/meta/fbnic/fbnic_debugfs.c
@@ -3,17 +3,51 @@
#include <linux/debugfs.h>
#include <linux/pci.h>
+#include <linux/rtnetlink.h>
+#include <linux/seq_file.h>
#include "fbnic.h"
static struct dentry *fbnic_dbg_root;
+static int fbnic_dbg_pcie_stats_show(struct seq_file *s, void *v)
+{
+ struct fbnic_dev *fbd = s->private;
+
+ rtnl_lock();
+ fbnic_get_hw_stats(fbd);
+
+ seq_printf(s, "ob_rd_tlp: %llu\n", fbd->hw_stats.pcie.ob_rd_tlp.value);
+ seq_printf(s, "ob_rd_dword: %llu\n",
+ fbd->hw_stats.pcie.ob_rd_dword.value);
+ seq_printf(s, "ob_wr_tlp: %llu\n", fbd->hw_stats.pcie.ob_wr_tlp.value);
+ seq_printf(s, "ob_wr_dword: %llu\n",
+ fbd->hw_stats.pcie.ob_wr_dword.value);
+ seq_printf(s, "ob_cpl_tlp: %llu\n",
+ fbd->hw_stats.pcie.ob_cpl_tlp.value);
+ seq_printf(s, "ob_cpl_dword: %llu\n",
+ fbd->hw_stats.pcie.ob_cpl_dword.value);
+ seq_printf(s, "ob_rd_no_tag: %llu\n",
+ fbd->hw_stats.pcie.ob_rd_no_tag.value);
+ seq_printf(s, "ob_rd_no_cpl_cred: %llu\n",
+ fbd->hw_stats.pcie.ob_rd_no_cpl_cred.value);
+ seq_printf(s, "ob_rd_no_np_cred: %llu\n",
+ fbd->hw_stats.pcie.ob_rd_no_np_cred.value);
+ rtnl_unlock();
+
+ return 0;
+}
+
+DEFINE_SHOW_ATTRIBUTE(fbnic_dbg_pcie_stats);
+
void fbnic_dbg_fbd_init(struct fbnic_dev *fbd)
{
struct pci_dev *pdev = to_pci_dev(fbd->dev);
const char *name = pci_name(pdev);
fbd->dbg_fbd = debugfs_create_dir(name, fbnic_dbg_root);
+ debugfs_create_file("pcie_stats", 0400, fbd->dbg_fbd, fbd,
+ &fbnic_dbg_pcie_stats_fops);
}
void fbnic_dbg_fbd_exit(struct fbnic_dev *fbd)
diff --git a/drivers/net/ethernet/meta/fbnic/fbnic_hw_stats.c b/drivers/net/ethernet/meta/fbnic/fbnic_hw_stats.c
index b3f8dc299b29..c391f2155054 100644
--- a/drivers/net/ethernet/meta/fbnic/fbnic_hw_stats.c
+++ b/drivers/net/ethernet/meta/fbnic/fbnic_hw_stats.c
@@ -28,3 +28,117 @@ u64 fbnic_stat_rd64(struct fbnic_dev *fbd, u32 reg, u32 offset)
*/
return ((u64)upper << 32);
}
+
+static void fbnic_hw_stat_rst64(struct fbnic_dev *fbd, u32 reg, s32 offset,
+ struct fbnic_stat_counter *stat)
+{
+ /* Record initial counter values and compute deltas from there to ensure
+ * stats start at 0 after reboot/reset. This avoids exposing absolute
+ * hardware counter values to userspace.
+ */
+ stat->u.old_reg_value_64 = fbnic_stat_rd64(fbd, reg, offset);
+}
+
+static void fbnic_hw_stat_rd64(struct fbnic_dev *fbd, u32 reg, s32 offset,
+ struct fbnic_stat_counter *stat)
+{
+ u64 new_reg_value;
+
+ new_reg_value = fbnic_stat_rd64(fbd, reg, offset);
+ stat->value += new_reg_value - stat->u.old_reg_value_64;
+ stat->u.old_reg_value_64 = new_reg_value;
+}
+
+static void fbnic_reset_pcie_stats_asic(struct fbnic_dev *fbd,
+ struct fbnic_pcie_stats *pcie)
+{
+ fbnic_hw_stat_rst64(fbd,
+ FBNIC_PUL_USER_OB_RD_TLP_CNT_31_0,
+ 1,
+ &pcie->ob_rd_tlp);
+ fbnic_hw_stat_rst64(fbd,
+ FBNIC_PUL_USER_OB_RD_DWORD_CNT_31_0,
+ 1,
+ &pcie->ob_rd_dword);
+ fbnic_hw_stat_rst64(fbd,
+ FBNIC_PUL_USER_OB_CPL_TLP_CNT_31_0,
+ 1,
+ &pcie->ob_cpl_tlp);
+ fbnic_hw_stat_rst64(fbd,
+ FBNIC_PUL_USER_OB_CPL_DWORD_CNT_31_0,
+ 1,
+ &pcie->ob_cpl_dword);
+ fbnic_hw_stat_rst64(fbd,
+ FBNIC_PUL_USER_OB_WR_TLP_CNT_31_0,
+ 1,
+ &pcie->ob_wr_tlp);
+ fbnic_hw_stat_rst64(fbd,
+ FBNIC_PUL_USER_OB_WR_DWORD_CNT_31_0,
+ 1,
+ &pcie->ob_wr_dword);
+
+ fbnic_hw_stat_rst64(fbd,
+ FBNIC_PUL_USER_OB_RD_DBG_CNT_TAG_31_0,
+ 1,
+ &pcie->ob_rd_no_tag);
+ fbnic_hw_stat_rst64(fbd,
+ FBNIC_PUL_USER_OB_RD_DBG_CNT_CPL_CRED_31_0,
+ 1,
+ &pcie->ob_rd_no_cpl_cred);
+ fbnic_hw_stat_rst64(fbd,
+ FBNIC_PUL_USER_OB_RD_DBG_CNT_NP_CRED_31_0,
+ 1,
+ &pcie->ob_rd_no_np_cred);
+}
+
+static void fbnic_get_pcie_stats_asic64(struct fbnic_dev *fbd,
+ struct fbnic_pcie_stats *pcie)
+{
+ fbnic_hw_stat_rd64(fbd,
+ FBNIC_PUL_USER_OB_RD_TLP_CNT_31_0,
+ 1,
+ &pcie->ob_rd_tlp);
+ fbnic_hw_stat_rd64(fbd,
+ FBNIC_PUL_USER_OB_RD_DWORD_CNT_31_0,
+ 1,
+ &pcie->ob_rd_dword);
+ fbnic_hw_stat_rd64(fbd,
+ FBNIC_PUL_USER_OB_WR_TLP_CNT_31_0,
+ 1,
+ &pcie->ob_wr_tlp);
+ fbnic_hw_stat_rd64(fbd,
+ FBNIC_PUL_USER_OB_WR_DWORD_CNT_31_0,
+ 1,
+ &pcie->ob_wr_dword);
+ fbnic_hw_stat_rd64(fbd,
+ FBNIC_PUL_USER_OB_CPL_TLP_CNT_31_0,
+ 1,
+ &pcie->ob_cpl_tlp);
+ fbnic_hw_stat_rd64(fbd,
+ FBNIC_PUL_USER_OB_CPL_DWORD_CNT_31_0,
+ 1,
+ &pcie->ob_cpl_dword);
+
+ fbnic_hw_stat_rd64(fbd,
+ FBNIC_PUL_USER_OB_RD_DBG_CNT_TAG_31_0,
+ 1,
+ &pcie->ob_rd_no_tag);
+ fbnic_hw_stat_rd64(fbd,
+ FBNIC_PUL_USER_OB_RD_DBG_CNT_CPL_CRED_31_0,
+ 1,
+ &pcie->ob_rd_no_cpl_cred);
+ fbnic_hw_stat_rd64(fbd,
+ FBNIC_PUL_USER_OB_RD_DBG_CNT_NP_CRED_31_0,
+ 1,
+ &pcie->ob_rd_no_np_cred);
+}
+
+void fbnic_reset_hw_stats(struct fbnic_dev *fbd)
+{
+ fbnic_reset_pcie_stats_asic(fbd, &fbd->hw_stats.pcie);
+}
+
+void fbnic_get_hw_stats(struct fbnic_dev *fbd)
+{
+ fbnic_get_pcie_stats_asic64(fbd, &fbd->hw_stats.pcie);
+}
diff --git a/drivers/net/ethernet/meta/fbnic/fbnic_hw_stats.h b/drivers/net/ethernet/meta/fbnic/fbnic_hw_stats.h
index 199ad2228ee9..b152c6b1b4ab 100644
--- a/drivers/net/ethernet/meta/fbnic/fbnic_hw_stats.h
+++ b/drivers/net/ethernet/meta/fbnic/fbnic_hw_stats.h
@@ -37,12 +37,24 @@ struct fbnic_mac_stats {
struct fbnic_eth_mac_stats eth_mac;
};
+struct fbnic_pcie_stats {
+ struct fbnic_stat_counter ob_rd_tlp, ob_rd_dword;
+ struct fbnic_stat_counter ob_wr_tlp, ob_wr_dword;
+ struct fbnic_stat_counter ob_cpl_tlp, ob_cpl_dword;
+
+ struct fbnic_stat_counter ob_rd_no_tag;
+ struct fbnic_stat_counter ob_rd_no_cpl_cred;
+ struct fbnic_stat_counter ob_rd_no_np_cred;
+};
+
struct fbnic_hw_stats {
struct fbnic_mac_stats mac;
+ struct fbnic_pcie_stats pcie;
};
u64 fbnic_stat_rd64(struct fbnic_dev *fbd, u32 reg, u32 offset);
+void fbnic_reset_hw_stats(struct fbnic_dev *fbd);
void fbnic_get_hw_stats(struct fbnic_dev *fbd);
#endif /* _FBNIC_HW_STATS_H_ */
diff --git a/drivers/net/ethernet/meta/fbnic/fbnic_pci.c b/drivers/net/ethernet/meta/fbnic/fbnic_pci.c
index 669ae39f3ac1..f913a87c78a2 100644
--- a/drivers/net/ethernet/meta/fbnic/fbnic_pci.c
+++ b/drivers/net/ethernet/meta/fbnic/fbnic_pci.c
@@ -9,6 +9,7 @@
#include "fbnic.h"
#include "fbnic_drvinfo.h"
+#include "fbnic_hw_stats.h"
#include "fbnic_netdev.h"
char fbnic_driver_name[] = DRV_NAME;
@@ -290,6 +291,9 @@ static int fbnic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
fbnic_devlink_register(fbd);
fbnic_dbg_fbd_init(fbd);
+ /* Capture snapshot of hardware stats so netdev can calculate delta */
+ fbnic_reset_hw_stats(fbd);
+
fbnic_hwmon_register(fbd);
if (!fbd->dsn) {
generated by cgit (git 2.34.1) at 2025-06-13 08:37:45 +0000