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rtl8139: use ldl/stl wrapper for unaligned 32-bit access 

The tx offload feature accesses a 16-bit aligned TCP header struct.  The
32-bit fields must be accessed using ldl/stl wrappers since some host
architectures fault on unaligned access.

Suggested-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Jason Wang <jasowang@redhat.com>
Message-id: 1438604157-29664-4-git-send-email-stefanha@redhat.com
This commit is contained in:
Stefan Hajnoczi 2015-08-03 13:15:57 +01:00
parent 1bf11332c4
commit 26c0114d3f
1 changed files with 8 additions and 3 deletions
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11
hw/net/rtl8139.c
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@ -2118,7 +2118,11 @@ static int rtl8139_cplus_transmit_one(RTL8139State *s)
DPRINTF("+++ C+ mode has IP packet\n");
/* not aligned */
/* Note on memory alignment: eth_payload_data is 16-bit aligned
* since saved_buffer is allocated with g_malloc() and ETH_HLEN is
* even. 32-bit accesses must use ldl/stl wrappers to avoid
* unaligned accesses.
*/
eth_payload_data = saved_buffer + ETH_HLEN;
eth_payload_len = saved_size - ETH_HLEN;
@ -2215,7 +2219,7 @@ static int rtl8139_cplus_transmit_one(RTL8139State *s)
}
DPRINTF("+++ C+ mode TSO TCP seqno %08x\n",
be32_to_cpu(p_tcp_hdr->th_seq));
ldl_be_p(&p_tcp_hdr->th_seq));
/* add 4 TCP pseudoheader fields */
/* copy IP source and destination fields */
@ -2271,7 +2275,8 @@ static int rtl8139_cplus_transmit_one(RTL8139State *s)
0, (uint8_t *) dot1q_buffer);
/* add transferred count to TCP sequence number */
p_tcp_hdr->th_seq = cpu_to_be32(chunk_size + be32_to_cpu(p_tcp_hdr->th_seq));
stl_be_p(&p_tcp_hdr->th_seq,
chunk_size + ldl_be_p(&p_tcp_hdr->th_seq));
++send_count;
}