1 files changed, 70 insertions, 0 deletions
diff --git a/drivers/net/ethernet/chelsio/cxgb4/cudbg_zlib.c b/drivers/net/ethernet/chelsio/cxgb4/cudbg_zlib.c
new file mode 100644
index 000000000..aad55fb35
--- /dev/null
+++ b/drivers/net/ethernet/chelsio/cxgb4/cudbg_zlib.c
@@ -0,0 +1,70 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *  Copyright (C) 2018 Chelsio Communications.  All rights reserved.
+ */
+
+#include <linux/zlib.h>
+
+#include "cxgb4.h"
+#include "cudbg_if.h"
+#include "cudbg_lib_common.h"
+#include "cudbg_zlib.h"
+
+static int cudbg_get_compress_hdr(struct cudbg_buffer *pdbg_buff,
+				  struct cudbg_buffer *pin_buff)
+{
+	if (pdbg_buff->offset + sizeof(struct cudbg_compress_hdr) >
+	    pdbg_buff->size)
+		return CUDBG_STATUS_NO_MEM;
+
+	pin_buff->data = (char *)pdbg_buff->data + pdbg_buff->offset;
+	pin_buff->offset = 0;
+	pin_buff->size = sizeof(struct cudbg_compress_hdr);
+	pdbg_buff->offset += sizeof(struct cudbg_compress_hdr);
+	return 0;
+}
+
+int cudbg_compress_buff(struct cudbg_init *pdbg_init,
+			struct cudbg_buffer *pin_buff,
+			struct cudbg_buffer *pout_buff)
+{
+	struct cudbg_buffer temp_buff = { 0 };
+	struct z_stream_s compress_stream;
+	struct cudbg_compress_hdr *c_hdr;
+	int rc;
+
+	/* Write compression header to output buffer before compression */
+	rc = cudbg_get_compress_hdr(pout_buff, &temp_buff);
+	if (rc)
+		return rc;
+
+	c_hdr = (struct cudbg_compress_hdr *)temp_buff.data;
+	c_hdr->compress_id = CUDBG_ZLIB_COMPRESS_ID;
+
+	memset(&compress_stream, 0, sizeof(struct z_stream_s));
+	compress_stream.workspace = pdbg_init->workspace;
+	rc = zlib_deflateInit2(&compress_stream, Z_DEFAULT_COMPRESSION,
+			       Z_DEFLATED, CUDBG_ZLIB_WIN_BITS,
+			       CUDBG_ZLIB_MEM_LVL, Z_DEFAULT_STRATEGY);
+	if (rc != Z_OK)
+		return CUDBG_SYSTEM_ERROR;
+
+	compress_stream.next_in = pin_buff->data;
+	compress_stream.avail_in = pin_buff->size;
+	compress_stream.next_out = pout_buff->data + pout_buff->offset;
+	compress_stream.avail_out = pout_buff->size - pout_buff->offset;
+
+	rc = zlib_deflate(&compress_stream, Z_FINISH);
+	if (rc != Z_STREAM_END)
+		return CUDBG_SYSTEM_ERROR;
+
+	rc = zlib_deflateEnd(&compress_stream);
+	if (rc != Z_OK)
+		return CUDBG_SYSTEM_ERROR;
+
+	c_hdr->compress_size = compress_stream.total_out;
+	c_hdr->decompress_size = pin_buff->size;
+	pout_buff->offset += compress_stream.total_out;
+
+	return 0;
+}