Changeset 948911d in mainline for uspace/lib/nic/src/nic_rx_control.c

Timestamp:

2012-01-24T02:27:43Z (12 years ago)

Author:

Jan Vesely <jano.vesely@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

230385c

Parents:

8afeb04 (diff), 2df6f6fe (diff)
Note: this is a merge changeset, the changes displayed below correspond to the merge itself.
Use the (diff) links above to see all the changes relative to each parent.

Message:

Mainline changes.

File:

• uspace/lib/nic/src/nic_rx_control.c (modified) (4 diffs)

uspace/lib/nic/src/nic_rx_control.c

@@ -40 +40 @@
 #include <bool.h>
 #include <errno.h>
-#include <net/device.h>
-#include <net_checksum.h>
-#include <packet_client.h>
+#include <mem.h>
+#include <nic/nic.h>
 #include "nic_rx_control.h"
 
@@ -392 +391 @@
  *
  * @param rxc
- * @param packet        The probed frame
+ * @param frame     The probed frame
  *
  * @return True if the frame passes, false if it does not
  */
-int nic_rxc_check(const nic_rxc_t *rxc, const packet_t *packet,
+int nic_rxc_check(const nic_rxc_t *rxc, const void *data, size_t size,
         nic_frame_type_t *frame_type)
 {
         assert(frame_type != NULL);
-        uint8_t *dest_addr = (uint8_t *) packet + packet->data_start;
+        uint8_t *dest_addr = (uint8_t *) data;
         uint8_t *src_addr = dest_addr + ETH_ADDR;
+
+        if (size < 2 * ETH_ADDR)
+                return false;
 
         if (dest_addr[0] & 1) {
@@ -448 +450 @@
         if (!rxc->vlan_exact && rxc->vlan_mask != NULL) {
                 vlan_header_t *vlan_header = (vlan_header_t *)
-                        ((uint8_t *) packet + packet->data_start + 2 * ETH_ADDR);
+                        ((uint8_t *) data + 2 * ETH_ADDR);
                 if (vlan_header->tpid_upper == VLAN_TPID_UPPER &&
                         vlan_header->tpid_lower == VLAN_TPID_LOWER) {
@@ -484 +486 @@
                 rxc->vlan_exact = vlan_exact;
 }
+
+/** Polynomial used in multicast address hashing */
+#define CRC_MCAST_POLYNOMIAL  0x04c11db6
+
+/** Compute the standard hash from MAC
+ *
+ * Hashing MAC into 64 possible values and using the value as index to
+ * 64bit number.
+ *
+ * The code is copied from qemu-0.13's implementation of ne2000 and rt8139
+ * drivers, but according to documentation there it originates in FreeBSD.
+ *
+ * @param[in] addr The 6-byte MAC address to be hashed
+ *
+ * @return 64-bit number with only single bit set to 1
+ *
+ */
+static uint64_t multicast_hash(const uint8_t addr[6])
+{
+        uint32_t crc;
+    int carry, i, j;
+    uint8_t b;
+
+    crc = 0xffffffff;
+    for (i = 0; i < 6; i++) {
+        b = addr[i];
+        for (j = 0; j < 8; j++) {
+            carry = ((crc & 0x80000000L) ? 1 : 0) ^ (b & 0x01);
+            crc <<= 1;
+            b >>= 1;
+            if (carry)
+                crc = ((crc ^ CRC_MCAST_POLYNOMIAL) | carry);
+        }
+    }
+        
+    uint64_t one64 = 1;
+    return one64 << (crc >> 26);
+}
+
 
 /**