linux-kernel - [PATCH V2 3/3] bnxt_en: Add support to collect crash dump via ethtool

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Message-Id: <1571313682-28900-4-git-send-email-sheetal.tigadoli@broadcom.com>
Date:   Thu, 17 Oct 2019 17:31:22 +0530
From:   Sheetal Tigadoli <sheetal.tigadoli@...adcom.com>
To:     Rafał Miłecki <zajec5@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Michal Simek <michal.simek@...inx.com>,
        Rajan Vaja <rajan.vaja@...inx.com>,
        Scott Branden <scott.branden@...adcom.com>,
        Ray Jui <ray.jui@...adcom.com>,
        Vikram Prakash <vikram.prakash@...adcom.com>,
        Jens Wiklander <jens.wiklander@...aro.org>,
        Michael Chan <michael.chan@...adcom.com>,
        "David S. Miller" <davem@...emloft.net>,
        Vikas Gupta <vikas.gupta@...adcom.com>,
        Vasundhara Volam <vasundhara-v.volam@...adcom.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        tee-dev@...ts.linaro.org, bcm-kernel-feedback-list@...adcom.com,
        netdev@...r.kernel.org,
        Sheetal Tigadoli <sheetal.tigadoli@...adcom.com>
Subject: [PATCH V2 3/3] bnxt_en: Add support to collect crash dump via ethtool

From: Vasundhara Volam <vasundhara-v.volam@...adcom.com>

Driver supports 2 types of core dumps.

1. Live dump - Firmware dump when system is up and running.
2. Crash dump - Dump which is collected during firmware crash
                that can be retrieved after recovery.
Crash dump is currently supported only on specific 58800 chips
which can be retrieved using OP-TEE API only, as firmware cannot
access this region directly.

User needs to set the dump flag using following command before
initiating the dump collection:

    $ ethtool -W|--set-dump eth0 N

Where N is "0" for live dump and "1" for crash dump

Command to collect the dump after setting the flag:

    $ ethtool -w eth0 data Filename

Cc: Michael Chan <michael.chan@...adcom.com>
Signed-off-by: Vasundhara Volam <vasundhara-v.volam@...adcom.com>
Signed-off-by: Sheetal Tigadoli <sheetal.tigadoli@...adcom.com>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt.h         |  3 ++
 drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c | 36 +++++++++++++++++++++--
 drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.h |  2 ++
 3 files changed, 39 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.h b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
index 0943715..3e7d1fb 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
@@ -1807,6 +1807,9 @@ struct bnxt {
 
 	u8			num_leds;
 	struct bnxt_led_info	leds[BNXT_MAX_LED];
+	u16			dump_flag;
+#define BNXT_DUMP_LIVE		0
+#define BNXT_DUMP_CRASH		1
 
 	struct bpf_prog		*xdp_prog;
 
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
index 51c1404..1596221 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
@@ -3311,6 +3311,23 @@ static int bnxt_get_coredump(struct bnxt *bp, void *buf, u32 *dump_len)
 	return rc;
 }
 
+static int bnxt_set_dump(struct net_device *dev, struct ethtool_dump *dump)
+{
+	struct bnxt *bp = netdev_priv(dev);
+
+#ifndef CONFIG_TEE_BNXT_FW
+	return -EOPNOTSUPP;
+#endif
+
+	if (dump->flag > BNXT_DUMP_CRASH) {
+		netdev_err(dev, "Supports only Live(0) and Crash(1) dumps.\n");
+		return -EINVAL;
+	}
+
+	bp->dump_flag = dump->flag;
+	return 0;
+}
+
 static int bnxt_get_dump_flag(struct net_device *dev, struct ethtool_dump *dump)
 {
 	struct bnxt *bp = netdev_priv(dev);
@@ -3323,7 +3340,12 @@ static int bnxt_get_dump_flag(struct net_device *dev, struct ethtool_dump *dump)
 			bp->ver_resp.hwrm_fw_bld_8b << 8 |
 			bp->ver_resp.hwrm_fw_rsvd_8b;
 
-	return bnxt_get_coredump(bp, NULL, &dump->len);
+	dump->flag = bp->dump_flag;
+	if (bp->dump_flag == BNXT_DUMP_CRASH)
+		dump->len = BNXT_CRASH_DUMP_LEN;
+	else
+		bnxt_get_coredump(bp, NULL, &dump->len);
+	return 0;
 }
 
 static int bnxt_get_dump_data(struct net_device *dev, struct ethtool_dump *dump,
@@ -3336,7 +3358,16 @@ static int bnxt_get_dump_data(struct net_device *dev, struct ethtool_dump *dump,
 
 	memset(buf, 0, dump->len);
 
-	return bnxt_get_coredump(bp, buf, &dump->len);
+	dump->flag = bp->dump_flag;
+	if (dump->flag == BNXT_DUMP_CRASH) {
+#ifdef CONFIG_TEE_BNXT_FW
+		return tee_bnxt_copy_coredump(buf, 0, dump->len);
+#endif
+	} else {
+		return bnxt_get_coredump(bp, buf, &dump->len);
+	}
+
+	return 0;
 }
 
 void bnxt_ethtool_init(struct bnxt *bp)
@@ -3446,6 +3477,7 @@ void bnxt_ethtool_free(struct bnxt *bp)
 	.set_phys_id		= bnxt_set_phys_id,
 	.self_test		= bnxt_self_test,
 	.reset			= bnxt_reset,
+	.set_dump		= bnxt_set_dump,
 	.get_dump_flag		= bnxt_get_dump_flag,
 	.get_dump_data		= bnxt_get_dump_data,
 };
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.h b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.h
index b5b65b3..01de7e7 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.h
@@ -59,6 +59,8 @@ struct hwrm_dbg_cmn_output {
 	#define HWRM_DBG_CMN_FLAGS_MORE	1
 };
 
+#define BNXT_CRASH_DUMP_LEN	(8 << 20)
+
 #define BNXT_LED_DFLT_ENA				\
 	(PORT_LED_CFG_REQ_ENABLES_LED0_ID |		\
 	 PORT_LED_CFG_REQ_ENABLES_LED0_STATE |		\
-- 
1.9.1