diff mbox series

[net] cxgb4: avoid collecting SGE_QBASE regs during traffic

Message ID 1616869148-6858-1-git-send-email-rahul.lakkireddy@chelsio.com (mailing list archive)
State Accepted
Commit 1bfb3dea965ff9f6226fd1709338f227363b6061
Delegated to: Netdev Maintainers
Headers show
Series [net] cxgb4: avoid collecting SGE_QBASE regs during traffic | expand

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netdev/cc_maintainers fail 1 blamed authors not CCed: ganeshgr@chelsio.com; 1 maintainers not CCed: ganeshgr@chelsio.com
netdev/source_inline success Was 0 now: 0
netdev/verify_signedoff success Link
netdev/module_param success Was 0 now: 0
netdev/build_32bit success Errors and warnings before: 2 this patch: 2
netdev/kdoc success Errors and warnings before: 2 this patch: 2
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netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 46 lines checked
netdev/build_allmodconfig_warn success Errors and warnings before: 2 this patch: 2
netdev/header_inline success Link

Commit Message

Rahul Lakkireddy March 27, 2021, 6:19 p.m. UTC
Accessing SGE_QBASE_MAP[0-3] and SGE_QBASE_INDEX registers can lead
to SGE missing doorbells under heavy traffic. So, only collect them
when adapter is idle. Also update the regdump range to skip collecting
these registers.

Fixes: 80a95a80d358 ("cxgb4: collect SGE PF/VF queue map")
Signed-off-by: Rahul Lakkireddy <rahul.lakkireddy@chelsio.com>
---
 .../net/ethernet/chelsio/cxgb4/cudbg_lib.c    | 23 +++++++++++++++----
 drivers/net/ethernet/chelsio/cxgb4/t4_hw.c    |  3 ++-
 2 files changed, 21 insertions(+), 5 deletions(-)

Comments

patchwork-bot+netdevbpf@kernel.org March 29, 2021, 11:20 p.m. UTC | #1
Hello:

This patch was applied to netdev/net.git (refs/heads/master):

On Sat, 27 Mar 2021 23:49:08 +0530 you wrote:
> Accessing SGE_QBASE_MAP[0-3] and SGE_QBASE_INDEX registers can lead
> to SGE missing doorbells under heavy traffic. So, only collect them
> when adapter is idle. Also update the regdump range to skip collecting
> these registers.
> 
> Fixes: 80a95a80d358 ("cxgb4: collect SGE PF/VF queue map")
> Signed-off-by: Rahul Lakkireddy <rahul.lakkireddy@chelsio.com>
> 
> [...]

Here is the summary with links:
  - [net] cxgb4: avoid collecting SGE_QBASE regs during traffic
    https://git.kernel.org/netdev/net/c/1bfb3dea965f

You are awesome, thank you!
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diff mbox series

Patch

diff --git a/drivers/net/ethernet/chelsio/cxgb4/cudbg_lib.c b/drivers/net/ethernet/chelsio/cxgb4/cudbg_lib.c
index 6c85a10f465c..23a2ebdfd503 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/cudbg_lib.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/cudbg_lib.c
@@ -1794,11 +1794,25 @@  int cudbg_collect_sge_indirect(struct cudbg_init *pdbg_init,
 	struct cudbg_buffer temp_buff = { 0 };
 	struct sge_qbase_reg_field *sge_qbase;
 	struct ireg_buf *ch_sge_dbg;
+	u8 padap_running = 0;
 	int i, rc;
+	u32 size;
 
-	rc = cudbg_get_buff(pdbg_init, dbg_buff,
-			    sizeof(*ch_sge_dbg) * 2 + sizeof(*sge_qbase),
-			    &temp_buff);
+	/* Accessing SGE_QBASE_MAP[0-3] and SGE_QBASE_INDEX regs can
+	 * lead to SGE missing doorbells under heavy traffic. So, only
+	 * collect them when adapter is idle.
+	 */
+	for_each_port(padap, i) {
+		padap_running = netif_running(padap->port[i]);
+		if (padap_running)
+			break;
+	}
+
+	size = sizeof(*ch_sge_dbg) * 2;
+	if (!padap_running)
+		size += sizeof(*sge_qbase);
+
+	rc = cudbg_get_buff(pdbg_init, dbg_buff, size, &temp_buff);
 	if (rc)
 		return rc;
 
@@ -1820,7 +1834,8 @@  int cudbg_collect_sge_indirect(struct cudbg_init *pdbg_init,
 		ch_sge_dbg++;
 	}
 
-	if (CHELSIO_CHIP_VERSION(padap->params.chip) > CHELSIO_T5) {
+	if (CHELSIO_CHIP_VERSION(padap->params.chip) > CHELSIO_T5 &&
+	    !padap_running) {
 		sge_qbase = (struct sge_qbase_reg_field *)ch_sge_dbg;
 		/* 1 addr reg SGE_QBASE_INDEX and 4 data reg
 		 * SGE_QBASE_MAP[0-3]
diff --git a/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c b/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c
index 98829e482bfa..80882cfc370f 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c
@@ -2090,7 +2090,8 @@  void t4_get_regs(struct adapter *adap, void *buf, size_t buf_size)
 		0x1190, 0x1194,
 		0x11a0, 0x11a4,
 		0x11b0, 0x11b4,
-		0x11fc, 0x1274,
+		0x11fc, 0x123c,
+		0x1254, 0x1274,
 		0x1280, 0x133c,
 		0x1800, 0x18fc,
 		0x3000, 0x302c,