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Message-ID: <20240713234339.70293-3-michael.chan@broadcom.com>
Date: Sat, 13 Jul 2024 16:43:32 -0700
From: Michael Chan <michael.chan@...adcom.com>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org,
edumazet@...gle.com,
kuba@...nel.org,
pabeni@...hat.com,
pavan.chebbi@...adcom.com,
andrew.gospodarek@...adcom.com,
Vikas Gupta <vikas.gupta@...adcom.com>,
Somnath Kotur <somnath.kotur@...adcom.com>
Subject: [PATCH net-next 2/9] bnxt_en: add support for retrieving crash dump using ethtool
From: Vikas Gupta <vikas.gupta@...adcom.com>
Add support for retrieving crash dump using ethtool -w on the
supported interface.
Reviewed-by: Somnath Kotur <somnath.kotur@...adcom.com>
Reviewed-by: Pavan Chebbi <pavan.chebbi@...adcom.com>
Reviewed-by: Andy Gospodarek <andrew.gospodarek@...adcom.com>
Signed-off-by: Vikas Gupta <vikas.gupta@...adcom.com>
Signed-off-by: Michael Chan <michael.chan@...adcom.com>
---
.../ethernet/broadcom/bnxt/bnxt_coredump.c | 83 +++++++++++++++++--
.../net/ethernet/broadcom/bnxt/bnxt_ethtool.c | 13 ++-
2 files changed, 87 insertions(+), 9 deletions(-)
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_coredump.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_coredump.c
index ebbad9ccab6a..9ed915e4c618 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_coredump.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_coredump.c
@@ -372,14 +372,78 @@ static int __bnxt_get_coredump(struct bnxt *bp, void *buf, u32 *dump_len)
return rc;
}
+static u32 bnxt_copy_crash_data(struct bnxt_ring_mem_info *rmem, void *buf,
+ u32 dump_len)
+{
+ u32 data_copied = 0;
+ u32 data_len;
+ int i;
+
+ for (i = 0; i < rmem->nr_pages; i++) {
+ data_len = rmem->page_size;
+ if (data_copied + data_len > dump_len)
+ data_len = dump_len - data_copied;
+ memcpy(buf + data_copied, rmem->pg_arr[i], data_len);
+ data_copied += data_len;
+ if (data_copied >= dump_len)
+ break;
+ }
+ return data_copied;
+}
+
+static int bnxt_copy_crash_dump(struct bnxt *bp, void *buf, u32 dump_len)
+{
+ struct bnxt_ring_mem_info *rmem;
+ u32 offset = 0;
+
+ if (!bp->fw_crash_mem)
+ return -EEXIST;
+
+ rmem = &bp->fw_crash_mem->ring_mem;
+
+ if (rmem->depth > 1) {
+ int i;
+
+ for (i = 0; i < rmem->nr_pages; i++) {
+ struct bnxt_ctx_pg_info *pg_tbl;
+
+ pg_tbl = bp->fw_crash_mem->ctx_pg_tbl[i];
+ offset += bnxt_copy_crash_data(&pg_tbl->ring_mem,
+ buf + offset,
+ dump_len - offset);
+ if (offset >= dump_len)
+ break;
+ }
+ } else {
+ bnxt_copy_crash_data(rmem, buf, dump_len);
+ }
+
+ return 0;
+}
+
+static bool bnxt_crash_dump_avail(struct bnxt *bp)
+{
+ u32 sig = 0;
+
+ /* First 4 bytes(signature) of crash dump is always non-zero */
+ bnxt_copy_crash_dump(bp, &sig, sizeof(u32));
+ if (!sig)
+ return false;
+
+ return true;
+}
+
int bnxt_get_coredump(struct bnxt *bp, u16 dump_type, void *buf, u32 *dump_len)
{
if (dump_type == BNXT_DUMP_CRASH) {
+ if (bp->fw_dbg_cap & DBG_QCAPS_RESP_FLAGS_CRASHDUMP_HOST_DDR)
+ return bnxt_copy_crash_dump(bp, buf, *dump_len);
#ifdef CONFIG_TEE_BNXT_FW
- return tee_bnxt_copy_coredump(buf, 0, *dump_len);
-#else
- return -EOPNOTSUPP;
+ else if (bp->fw_dbg_cap & DBG_QCAPS_RESP_FLAGS_CRASHDUMP_SOC_DDR)
+ return tee_bnxt_copy_coredump(buf, 0, *dump_len);
#endif
+ else
+ return -EOPNOTSUPP;
} else {
return __bnxt_get_coredump(bp, buf, dump_len);
}
@@ -442,10 +506,17 @@ u32 bnxt_get_coredump_length(struct bnxt *bp, u16 dump_type)
{
u32 len = 0;
+ if (dump_type == BNXT_DUMP_CRASH &&
+ bp->fw_dbg_cap & DBG_QCAPS_RESP_FLAGS_CRASHDUMP_HOST_DDR &&
+ bp->fw_crash_mem) {
+ if (!bnxt_crash_dump_avail(bp))
+ return 0;
+
+ return bp->fw_crash_len;
+ }
+
if (bnxt_hwrm_get_dump_len(bp, dump_type, &len)) {
- if (dump_type == BNXT_DUMP_CRASH)
- len = BNXT_CRASH_DUMP_LEN;
- else
+ if (dump_type != BNXT_DUMP_CRASH)
__bnxt_get_coredump(bp, NULL, &len);
}
return len;
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
index f121a5e9691f..1e720aa69568 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ethtool.c
@@ -4983,9 +4983,16 @@ static int bnxt_set_dump(struct net_device *dev, struct ethtool_dump *dump)
return -EINVAL;
}
- if (!IS_ENABLED(CONFIG_TEE_BNXT_FW) && dump->flag == BNXT_DUMP_CRASH) {
- netdev_info(dev, "Cannot collect crash dump as TEE_BNXT_FW config option is not enabled.\n");
- return -EOPNOTSUPP;
+ if (dump->flag == BNXT_DUMP_CRASH) {
+ if (bp->fw_dbg_cap & DBG_QCAPS_RESP_FLAGS_CRASHDUMP_SOC_DDR &&
+ (!IS_ENABLED(CONFIG_TEE_BNXT_FW))) {
+ netdev_info(dev,
+ "Cannot collect crash dump as TEE_BNXT_FW config option is not enabled.\n");
+ return -EOPNOTSUPP;
+ } else if (!(bp->fw_dbg_cap & DBG_QCAPS_RESP_FLAGS_CRASHDUMP_HOST_DDR)) {
+ netdev_info(dev, "Crash dump collection from host memory is not supported on this interface.\n");
+ return -EOPNOTSUPP;
+ }
}
bp->dump_flag = dump->flag;
--
2.30.1
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