ppc/spapr: load and store l2 state with helper functions

[mirror_qemu.git] / include / net / checksum.h

diff --git a/include/net/checksum.h b/include/net/checksum.h
index 7de1acb79abf893d1a3be36c726e4e21f70f68e0..7dec37e56c78cb8f4129b69ce17d8e6b08bcd1a2 100644 (file)
--- a/include/net/checksum.h
+++ b/include/net/checksum.h
@@ -18,13 +18,19 @@
 #ifndef QEMU_NET_CHECKSUM_H
 #define QEMU_NET_CHECKSUM_H
 
+#include "qemu/bswap.h"
 struct iovec;
 
+#define CSUM_IP     0x01
+#define CSUM_TCP    0x02
+#define CSUM_UDP    0x04
+#define CSUM_ALL    (CSUM_IP | CSUM_TCP | CSUM_UDP)
+
 uint32_t net_checksum_add_cont(int len, uint8_t *buf, int seq);
 uint16_t net_checksum_finish(uint32_t sum);
 uint16_t net_checksum_tcpudp(uint16_t length, uint16_t proto,
                              uint8_t *addrs, uint8_t *buf);
-void net_checksum_calculate(uint8_t *data, int length);
+void net_checksum_calculate(uint8_t *data, int length, int csum_flag);
 
 static inline uint32_t
 net_checksum_add(int len, uint8_t *buf)
@@ -32,6 +38,12 @@ net_checksum_add(int len, uint8_t *buf)
     return net_checksum_add_cont(len, buf, 0);
 }
 
+static inline uint16_t
+net_checksum_finish_nozero(uint32_t sum)
+{
+    return net_checksum_finish(sum) ?: 0xFFFF;
+}
+
 static inline uint16_t
 net_raw_checksum(uint8_t *data, int length)
 {
@@ -45,9 +57,55 @@ net_raw_checksum(uint8_t *data, int length)
  * @iov_cnt: number of array elements
  * @iov_off: starting iov offset for checksumming
  * @size: length of data to be checksummed
+ * @csum_offset: offset of the checksum chunk
  */
 uint32_t net_checksum_add_iov(const struct iovec *iov,
                               const unsigned int iov_cnt,
-                              uint32_t iov_off, uint32_t size);
+                              uint32_t iov_off, uint32_t size,
+                              uint32_t csum_offset);
+
+typedef struct toeplitz_key_st {
+    uint32_t leftmost_32_bits;
+    uint8_t *next_byte;
+} net_toeplitz_key;
+
+static inline
+void net_toeplitz_key_init(net_toeplitz_key *key, uint8_t *key_bytes)
+{
+    key->leftmost_32_bits = be32_to_cpu(*(uint32_t *)key_bytes);
+    key->next_byte = key_bytes + sizeof(uint32_t);
+}
+
+static inline
+void net_toeplitz_add(uint32_t *result,
+                      uint8_t *input,
+                      uint32_t len,
+                      net_toeplitz_key *key)
+{
+    register uint32_t accumulator = *result;
+    register uint32_t leftmost_32_bits = key->leftmost_32_bits;
+    register uint32_t byte;
+
+    for (byte = 0; byte < len; byte++) {
+        register uint8_t input_byte = input[byte];
+        register uint8_t key_byte = *(key->next_byte++);
+        register uint8_t bit;
+
+        for (bit = 0; bit < 8; bit++) {
+            if (input_byte & (1 << 7)) {
+                accumulator ^= leftmost_32_bits;
+            }
+
+            leftmost_32_bits =
+                (leftmost_32_bits << 1) | ((key_byte & (1 << 7)) >> 7);
+
+            input_byte <<= 1;
+            key_byte <<= 1;
+        }
+    }
+
+    key->leftmost_32_bits = leftmost_32_bits;
+    *result = accumulator;
+}
 
 #endif /* QEMU_NET_CHECKSUM_H */