bnxt_en: Add a new ethtool -W dump flag

Add a new ethtool -W dump flag (2) to include driver coredump segments.
This patch adds the host backing store context memory pages used by the
chip and FW to store various states to the coredump.  The pages for
each context memory type is dumped into a separate coredump segment.

Reviewed-by: Andy Gospodarek <[email protected]>
Reviewed-by: Selvin Thyparampil Xavier <[email protected]>
Reviewed-by: Shruti Parab <[email protected]>
Reviewed-by: Kalesh AP <[email protected]>
Reviewed-by: Saravanan Vajravel <[email protected]>
Reviewed-by: Kashyap Desai <[email protected]>
Signed-off-by: Michael Chan <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

Author: Michael Chan

drivers/net/ethernet/broadcom/bnxt/bnxt.h

@@ -2662,6 +2662,7 @@ struct bnxt {
 	u16			dump_flag;
 #define BNXT_DUMP_LIVE		0
 #define BNXT_DUMP_CRASH		1
+#define BNXT_DUMP_DRIVER	2
 
 	struct bpf_prog		*xdp_prog;
 

drivers/net/ethernet/broadcom/bnxt/bnxt_coredump.c

@@ -15,6 +15,18 @@
 #include "bnxt_hwrm.h"
 #include "bnxt_coredump.h"
 
+static const u16 bnxt_bstore_to_seg_id[] = {
+	[BNXT_CTX_QP]			= BNXT_CTX_MEM_SEG_QP,
+	[BNXT_CTX_SRQ]			= BNXT_CTX_MEM_SEG_SRQ,
+	[BNXT_CTX_CQ]			= BNXT_CTX_MEM_SEG_CQ,
+	[BNXT_CTX_VNIC]			= BNXT_CTX_MEM_SEG_VNIC,
+	[BNXT_CTX_STAT]			= BNXT_CTX_MEM_SEG_STAT,
+	[BNXT_CTX_STQM]			= BNXT_CTX_MEM_SEG_STQM,
+	[BNXT_CTX_FTQM]			= BNXT_CTX_MEM_SEG_FTQM,
+	[BNXT_CTX_MRAV]			= BNXT_CTX_MEM_SEG_MRAV,
+	[BNXT_CTX_TIM]			= BNXT_CTX_MEM_SEG_TIM,
+};
+
 static int bnxt_hwrm_dbg_dma_data(struct bnxt *bp, void *msg,
 				  struct bnxt_hwrm_dbg_dma_info *info)
 {
@@ -267,7 +279,47 @@ bnxt_fill_coredump_record(struct bnxt *bp, struct bnxt_coredump_record *record,
 	record->ioctl_high_version = 0;
 }
 
-static int __bnxt_get_coredump(struct bnxt *bp, void *buf, u32 *dump_len)
+static u32 bnxt_get_ctx_coredump(struct bnxt *bp, void *buf, u32 offset,
+				 u32 *segs)
+{
+	struct bnxt_coredump_segment_hdr seg_hdr;
+	struct bnxt_ctx_mem_info *ctx = bp->ctx;
+	u32 comp_id = BNXT_DRV_COMP_ID;
+	void *data = NULL;
+	size_t len = 0;
+	u16 type;
+
+	*segs = 0;
+	if (!ctx)
+		return 0;
+
+	if (buf)
+		buf += offset;
+	for (type = 0 ; type <= BNXT_CTX_TIM; type++) {
+		struct bnxt_ctx_mem_type *ctxm = &ctx->ctx_arr[type];
+		u32 seg_id = bnxt_bstore_to_seg_id[type];
+		size_t seg_len;
+
+		if (!ctxm->entry_size || !ctxm->pg_info || !seg_id)
+			continue;
+
+		if (buf)
+			data = buf + BNXT_SEG_HDR_LEN;
+		seg_len = bnxt_copy_ctx_mem(bp, ctxm, data, 0);
+		if (buf) {
+			bnxt_fill_coredump_seg_hdr(bp, &seg_hdr, NULL, seg_len,
+						   0, 0, 0, comp_id, seg_id);
+			memcpy(buf, &seg_hdr, BNXT_SEG_HDR_LEN);
+			buf += BNXT_SEG_HDR_LEN + seg_len;
+		}
+		len += BNXT_SEG_HDR_LEN + seg_len;
+		*segs += 1;
+	}
+	return len;
+}
+
+static int __bnxt_get_coredump(struct bnxt *bp, u16 dump_type, void *buf,
+			       u32 *dump_len)
 {
 	u32 ver_get_resp_len = sizeof(struct hwrm_ver_get_output);
 	u32 offset = 0, seg_hdr_len, seg_record_len, buf_len = 0;
@@ -298,6 +350,18 @@ static int __bnxt_get_coredump(struct bnxt *bp, void *buf, u32 *dump_len)
 		offset += ver_get_resp_len;
 	}
 
+	if (dump_type == BNXT_DUMP_DRIVER) {
+		u32 drv_len, segs = 0;
+
+		drv_len = bnxt_get_ctx_coredump(bp, buf, offset, &segs);
+		*dump_len += drv_len;
+		offset += drv_len;
+		if (buf)
+			coredump.total_segs += segs;
+		goto err;
+	}
+
+	seg_record_len = sizeof(*seg_record);
 	rc = bnxt_hwrm_dbg_coredump_list(bp, &coredump);
 	if (rc) {
 		netdev_err(bp->dev, "Failed to get coredump segment list\n");
@@ -442,7 +506,7 @@ int bnxt_get_coredump(struct bnxt *bp, u16 dump_type, void *buf, u32 *dump_len)
 		else
 			return -EOPNOTSUPP;
 	} else {
-		return __bnxt_get_coredump(bp, buf, dump_len);
+		return __bnxt_get_coredump(bp, dump_type, buf, dump_len);
 	}
 }
 
@@ -512,9 +576,12 @@ u32 bnxt_get_coredump_length(struct bnxt *bp, u16 dump_type)
 		return bp->fw_crash_len;
 	}
 
-	if (bnxt_hwrm_get_dump_len(bp, dump_type, &len)) {
-		if (dump_type != BNXT_DUMP_CRASH)
-			__bnxt_get_coredump(bp, NULL, &len);
+	if (dump_type != BNXT_DUMP_DRIVER) {
+		if (!bnxt_hwrm_get_dump_len(bp, dump_type, &len))
+			return len;
 	}
+	if (dump_type != BNXT_DUMP_CRASH)
+		__bnxt_get_coredump(bp, dump_type, NULL, &len);
+
 	return len;
 }

drivers/net/ethernet/broadcom/bnxt/bnxt_coredump.h

@@ -69,12 +69,27 @@ struct bnxt_coredump_record {
 };
 
 #define BNXT_VER_GET_COMP_ID	2
+#define BNXT_DRV_COMP_ID	0xd
+
+#define BNXT_CTX_MEM_SEG_ID_START  0x200
+
+#define BNXT_CTX_MEM_SEG_QP	(BNXT_CTX_MEM_SEG_ID_START + BNXT_CTX_QP)
+#define BNXT_CTX_MEM_SEG_SRQ	(BNXT_CTX_MEM_SEG_ID_START + BNXT_CTX_SRQ)
+#define BNXT_CTX_MEM_SEG_CQ	(BNXT_CTX_MEM_SEG_ID_START + BNXT_CTX_CQ)
+#define BNXT_CTX_MEM_SEG_VNIC	(BNXT_CTX_MEM_SEG_ID_START + BNXT_CTX_VNIC)
+#define BNXT_CTX_MEM_SEG_STAT	(BNXT_CTX_MEM_SEG_ID_START + BNXT_CTX_STAT)
+#define BNXT_CTX_MEM_SEG_STQM	(BNXT_CTX_MEM_SEG_ID_START + BNXT_CTX_STQM)
+#define BNXT_CTX_MEM_SEG_FTQM	(BNXT_CTX_MEM_SEG_ID_START + BNXT_CTX_FTQM)
+#define BNXT_CTX_MEM_SEG_MRAV	(BNXT_CTX_MEM_SEG_ID_START + BNXT_CTX_MRAV)
+#define BNXT_CTX_MEM_SEG_TIM	(BNXT_CTX_MEM_SEG_ID_START + BNXT_CTX_TIM)
 
 #define BNXT_CRASH_DUMP_LEN	(8 << 20)
 
 #define COREDUMP_LIST_BUF_LEN		2048
 #define COREDUMP_RETRIEVE_BUF_LEN	4096
 
+#define BNXT_SEG_HDR_LEN	sizeof(struct bnxt_coredump_segment_hdr)
+
 struct bnxt_coredump {
 	void		*data;
 	int		data_size;

drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c

@@ -4984,8 +4984,8 @@ static int bnxt_set_dump(struct net_device *dev, struct ethtool_dump *dump)
 {
 	struct bnxt *bp = netdev_priv(dev);
 
-	if (dump->flag > BNXT_DUMP_CRASH) {
-		netdev_info(dev, "Supports only Live(0) and Crash(1) dumps.\n");
+	if (dump->flag > BNXT_DUMP_DRIVER) {
+		netdev_info(dev, "Supports only Live(0), Crash(1), Driver(2) dumps.\n");
 		return -EINVAL;
 	}