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path: root/drivers/net/ethernet/chelsio/cxgb4/cudbg_zlib.c
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Diffstat (limited to 'drivers/net/ethernet/chelsio/cxgb4/cudbg_zlib.c')
-rw-r--r--drivers/net/ethernet/chelsio/cxgb4/cudbg_zlib.c70
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;
+}