[PATCH v6 3/8] hw/net: i82596: Remove the logic of padding short frames in the receive path

[bmeng.cn@gmail.com]

From: Bin Meng <bmeng.cn@gmail.com>

Now that we have implemented unified short frames padding in the
QEMU networking codes, remove the same logic in the NIC codes.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Signed-off-by: Bin Meng <bmeng@tinylab.org>
---

 hw/net/i82596.c | 18 ------------------
 1 file changed, 18 deletions(-)

diff --git a/hw/net/i82596.c b/hw/net/i82596.c
index ec21e2699a..ab26f8bea1 100644
--- a/hw/net/i82596.c
+++ b/hw/net/i82596.c
@@ -72,10 +72,6 @@ enum commands {
 #define I596_EOF        0x8000
 #define SIZE_MASK       0x3fff
 
-#define ETHER_TYPE_LEN 2
-#define VLAN_TCI_LEN 2
-#define VLAN_HLEN (ETHER_TYPE_LEN + VLAN_TCI_LEN)
-
 /* various flags in the chip config registers */
 #define I596_PREFETCH   (s->config[0] & 0x80)
 #define I596_PROMISC    (s->config[8] & 0x01)
@@ -488,8 +484,6 @@ bool i82596_can_receive(NetClientState *nc)
     return true;
 }
 
-#define MIN_BUF_SIZE 60
-
 ssize_t i82596_receive(NetClientState *nc, const uint8_t *buf, size_t sz)
 {
     I82596State *s = qemu_get_nic_opaque(nc);
@@ -500,7 +494,6 @@ ssize_t i82596_receive(NetClientState *nc, const uint8_t *buf, size_t sz)
     size_t bufsz = sz; /* length of data in buf */
     uint32_t crc;
     uint8_t *crc_ptr;
-    uint8_t buf1[MIN_BUF_SIZE + VLAN_HLEN];
     static const uint8_t broadcast_macaddr[6] = {
                 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 
@@ -583,17 +576,6 @@ ssize_t i82596_receive(NetClientState *nc, const uint8_t *buf, size_t sz)
         }
     }
 
-    /* if too small buffer, then expand it */
-    if (len < MIN_BUF_SIZE + VLAN_HLEN) {
-        memcpy(buf1, buf, len);
-        memset(buf1 + len, 0, MIN_BUF_SIZE + VLAN_HLEN - len);
-        buf = buf1;
-        if (len < MIN_BUF_SIZE) {
-            len = MIN_BUF_SIZE;
-        }
-        bufsz = len;
-    }
-
     /* Calculate the ethernet checksum (4 bytes) */
     len += 4;
     crc = cpu_to_be32(crc32(~0, buf, sz));
-- 
2.34.1