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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [qemu-xen-traditional stable-4.4] rtl8139: drop tautologous if (ip) {...} statement
commit 3a069fe310d32f7a40169a338e12f07f559d904a
Author: Stefan Hajnoczi <stefanha@xxxxxxxxxx>
AuthorDate: Wed Jul 15 18:16:59 2015 +0100
Commit: Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>
CommitDate: Tue May 10 19:16:19 2016 +0100
rtl8139: drop tautologous if (ip) {...} statement
The previous patch stopped using the ip pointer as an indicator that the
IP header is present. When we reach the if (ip) {...} statement we know
ip is always non-NULL.
Remove the if statement to reduce nesting.
Signed-off-by: Stefan Hajnoczi <stefanha@xxxxxxxxxx>
[Backport to qemu-xen-tradition]
Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
hw/rtl8139.c | 255 +++++++++++++++++++++++++++++------------------------------
1 file changed, 126 insertions(+), 129 deletions(-)
diff --git a/hw/rtl8139.c b/hw/rtl8139.c
index 44c221c..8b17bd9 100644
--- a/hw/rtl8139.c
+++ b/hw/rtl8139.c
@@ -2137,185 +2137,182 @@ static int rtl8139_cplus_transmit_one(RTL8139State *s)
ip_protocol = ip->ip_p;
ip_data_len = be16_to_cpu(ip->ip_len) - hlen;
- if (ip)
+ if (txdw0 & CP_TX_IPCS)
{
- if (txdw0 & CP_TX_IPCS)
- {
- DEBUG_PRINT(("RTL8139: +++ C+ mode need IP checksum\n"));
+ DEBUG_PRINT(("RTL8139: +++ C+ mode need IP checksum\n"));
- if (hlen<sizeof(ip_header) || hlen>eth_payload_len) {/*
min header length */
- /* bad packet header len */
- /* or packet too short */
- }
- else
- {
- ip->ip_sum = 0;
- ip->ip_sum = ip_checksum(ip, hlen);
- DEBUG_PRINT(("RTL8139: +++ C+ mode IP header len=%d
checksum=%04x\n", hlen, ip->ip_sum));
- }
+ if (hlen<sizeof(ip_header) || hlen>eth_payload_len) {/* min
header length */
+ /* bad packet header len */
+ /* or packet too short */
}
-
- if ((txdw0 & CP_TX_LGSEN) && ip_protocol == IP_PROTO_TCP)
+ else
{
+ ip->ip_sum = 0;
+ ip->ip_sum = ip_checksum(ip, hlen);
+ DEBUG_PRINT(("RTL8139: +++ C+ mode IP header len=%d
checksum=%04x\n", hlen, ip->ip_sum));
+ }
+ }
+
+ if ((txdw0 & CP_TX_LGSEN) && ip_protocol == IP_PROTO_TCP)
+ {
#if defined (DEBUG_RTL8139)
- int large_send_mss = (txdw0 >> 16) & CP_TC_LGSEN_MSS_MASK;
+ int large_send_mss = (txdw0 >> 16) & CP_TC_LGSEN_MSS_MASK;
#endif
- DEBUG_PRINT(("RTL8139: +++ C+ mode offloaded task TSO
MTU=%d IP data %d frame data %d specified MSS=%d\n",
- ETH_MTU, ip_data_len, saved_size - ETH_HLEN,
large_send_mss));
-
- int tcp_send_offset = 0;
- int send_count = 0;
+ DEBUG_PRINT(("RTL8139: +++ C+ mode offloaded task TSO MTU=%d
IP data %d frame data %d specified MSS=%d\n",
+ ETH_MTU, ip_data_len, saved_size - ETH_HLEN,
large_send_mss));
- /* maximum IP header length is 60 bytes */
- uint8_t saved_ip_header[60];
+ int tcp_send_offset = 0;
+ int send_count = 0;
- /* save IP header template; data area is used in tcp
checksum calculation */
- memcpy(saved_ip_header, eth_payload_data, hlen);
+ /* maximum IP header length is 60 bytes */
+ uint8_t saved_ip_header[60];
- /* a placeholder for checksum calculation routine in tcp
case */
- uint8_t *data_to_checksum = eth_payload_data + hlen -
12;
- // size_t data_to_checksum_len =
eth_payload_len - hlen + 12;
+ /* save IP header template; data area is used in tcp checksum
calculation */
+ memcpy(saved_ip_header, eth_payload_data, hlen);
- /* pointer to TCP header */
- tcp_header *p_tcp_hdr = (tcp_header*)(eth_payload_data +
hlen);
+ /* a placeholder for checksum calculation routine in tcp case
*/
+ uint8_t *data_to_checksum = eth_payload_data + hlen - 12;
+ // size_t data_to_checksum_len =
eth_payload_len - hlen + 12;
- int tcp_hlen = TCP_HEADER_DATA_OFFSET(p_tcp_hdr);
+ /* pointer to TCP header */
+ tcp_header *p_tcp_hdr = (tcp_header*)(eth_payload_data + hlen);
- /* ETH_MTU = ip header len + tcp header len + payload */
- int tcp_data_len = ip_data_len - tcp_hlen;
- int tcp_chunk_size = ETH_MTU - hlen - tcp_hlen;
+ int tcp_hlen = TCP_HEADER_DATA_OFFSET(p_tcp_hdr);
- DEBUG_PRINT(("RTL8139: +++ C+ mode TSO IP data len %d TCP
hlen %d TCP data len %d TCP chunk size %d\n",
- ip_data_len, tcp_hlen, tcp_data_len,
tcp_chunk_size));
+ /* ETH_MTU = ip header len + tcp header len + payload */
+ int tcp_data_len = ip_data_len - tcp_hlen;
+ int tcp_chunk_size = ETH_MTU - hlen - tcp_hlen;
- /* note the cycle below overwrites IP header data,
- but restores it from saved_ip_header before sending
packet */
+ DEBUG_PRINT(("RTL8139: +++ C+ mode TSO IP data len %d TCP hlen
%d TCP data len %d TCP chunk size %d\n",
+ ip_data_len, tcp_hlen, tcp_data_len,
tcp_chunk_size));
- int is_last_frame = 0;
+ /* note the cycle below overwrites IP header data,
+ but restores it from saved_ip_header before sending packet
*/
- for (tcp_send_offset = 0; tcp_send_offset < tcp_data_len;
tcp_send_offset += tcp_chunk_size)
- {
- uint16_t chunk_size = tcp_chunk_size;
+ int is_last_frame = 0;
- /* check if this is the last frame */
- if (tcp_send_offset + tcp_chunk_size >= tcp_data_len)
- {
- is_last_frame = 1;
- chunk_size = tcp_data_len - tcp_send_offset;
- }
+ for (tcp_send_offset = 0; tcp_send_offset < tcp_data_len;
tcp_send_offset += tcp_chunk_size)
+ {
+ uint16_t chunk_size = tcp_chunk_size;
- DEBUG_PRINT(("RTL8139: +++ C+ mode TSO TCP seqno
%08x\n", be32_to_cpu(p_tcp_hdr->th_seq)));
+ /* check if this is the last frame */
+ if (tcp_send_offset + tcp_chunk_size >= tcp_data_len)
+ {
+ is_last_frame = 1;
+ chunk_size = tcp_data_len - tcp_send_offset;
+ }
- /* add 4 TCP pseudoheader fields */
- /* copy IP source and destination fields */
- memcpy(data_to_checksum, saved_ip_header + 12, 8);
+ DEBUG_PRINT(("RTL8139: +++ C+ mode TSO TCP seqno %08x\n",
be32_to_cpu(p_tcp_hdr->th_seq)));
- DEBUG_PRINT(("RTL8139: +++ C+ mode TSO calculating TCP
checksum for packet with %d bytes data\n", tcp_hlen + chunk_size));
+ /* add 4 TCP pseudoheader fields */
+ /* copy IP source and destination fields */
+ memcpy(data_to_checksum, saved_ip_header + 12, 8);
- if (tcp_send_offset)
- {
- memcpy((uint8_t*)p_tcp_hdr + tcp_hlen,
(uint8_t*)p_tcp_hdr + tcp_hlen + tcp_send_offset, chunk_size);
- }
+ DEBUG_PRINT(("RTL8139: +++ C+ mode TSO calculating TCP
checksum for packet with %d bytes data\n", tcp_hlen + chunk_size));
- /* keep PUSH and FIN flags only for the last frame */
- if (!is_last_frame)
- {
- TCP_HEADER_CLEAR_FLAGS(p_tcp_hdr,
TCP_FLAG_PUSH|TCP_FLAG_FIN);
- }
+ if (tcp_send_offset)
+ {
+ memcpy((uint8_t*)p_tcp_hdr + tcp_hlen,
(uint8_t*)p_tcp_hdr + tcp_hlen + tcp_send_offset, chunk_size);
+ }
- /* recalculate TCP checksum */
- ip_pseudo_header *p_tcpip_hdr = (ip_pseudo_header
*)data_to_checksum;
- p_tcpip_hdr->zeros = 0;
- p_tcpip_hdr->ip_proto = IP_PROTO_TCP;
- p_tcpip_hdr->ip_payload = cpu_to_be16(tcp_hlen +
chunk_size);
+ /* keep PUSH and FIN flags only for the last frame */
+ if (!is_last_frame)
+ {
+ TCP_HEADER_CLEAR_FLAGS(p_tcp_hdr,
TCP_FLAG_PUSH|TCP_FLAG_FIN);
+ }
- p_tcp_hdr->th_sum = 0;
+ /* recalculate TCP checksum */
+ ip_pseudo_header *p_tcpip_hdr = (ip_pseudo_header
*)data_to_checksum;
+ p_tcpip_hdr->zeros = 0;
+ p_tcpip_hdr->ip_proto = IP_PROTO_TCP;
+ p_tcpip_hdr->ip_payload = cpu_to_be16(tcp_hlen +
chunk_size);
- int tcp_checksum = ip_checksum(data_to_checksum,
tcp_hlen + chunk_size + 12);
- DEBUG_PRINT(("RTL8139: +++ C+ mode TSO TCP checksum
%04x\n", tcp_checksum));
+ p_tcp_hdr->th_sum = 0;
- p_tcp_hdr->th_sum = tcp_checksum;
+ int tcp_checksum = ip_checksum(data_to_checksum, tcp_hlen
+ chunk_size + 12);
+ DEBUG_PRINT(("RTL8139: +++ C+ mode TSO TCP checksum
%04x\n", tcp_checksum));
- /* restore IP header */
- memcpy(eth_payload_data, saved_ip_header, hlen);
+ p_tcp_hdr->th_sum = tcp_checksum;
- /* set IP data length and recalculate IP checksum */
- ip->ip_len = cpu_to_be16(hlen + tcp_hlen + chunk_size);
+ /* restore IP header */
+ memcpy(eth_payload_data, saved_ip_header, hlen);
- /* increment IP id for subsequent frames */
- ip->ip_id = cpu_to_be16(tcp_send_offset/tcp_chunk_size
+ be16_to_cpu(ip->ip_id));
+ /* set IP data length and recalculate IP checksum */
+ ip->ip_len = cpu_to_be16(hlen + tcp_hlen + chunk_size);
- ip->ip_sum = 0;
- ip->ip_sum = ip_checksum(eth_payload_data, hlen);
- DEBUG_PRINT(("RTL8139: +++ C+ mode TSO IP header
len=%d checksum=%04x\n", hlen, ip->ip_sum));
+ /* increment IP id for subsequent frames */
+ ip->ip_id = cpu_to_be16(tcp_send_offset/tcp_chunk_size +
be16_to_cpu(ip->ip_id));
- int tso_send_size = ETH_HLEN + hlen + tcp_hlen +
chunk_size;
- DEBUG_PRINT(("RTL8139: +++ C+ mode TSO transferring
packet size %d\n", tso_send_size));
- rtl8139_transfer_frame(s, saved_buffer, tso_send_size,
0);
+ ip->ip_sum = 0;
+ ip->ip_sum = ip_checksum(eth_payload_data, hlen);
+ DEBUG_PRINT(("RTL8139: +++ C+ mode TSO IP header len=%d
checksum=%04x\n", hlen, ip->ip_sum));
- /* 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));
- ++send_count;
- }
+ int tso_send_size = ETH_HLEN + hlen + tcp_hlen +
chunk_size;
+ DEBUG_PRINT(("RTL8139: +++ C+ mode TSO transferring packet
size %d\n", tso_send_size));
+ rtl8139_transfer_frame(s, saved_buffer, tso_send_size, 0);
- /* Stop sending this frame */
- saved_size = 0;
+ /* 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));
+ ++send_count;
}
- else if (txdw0 & (CP_TX_TCPCS|CP_TX_UDPCS))
- {
- DEBUG_PRINT(("RTL8139: +++ C+ mode need TCP or UDP
checksum\n"));
- /* maximum IP header length is 60 bytes */
- uint8_t saved_ip_header[60];
- memcpy(saved_ip_header, eth_payload_data, hlen);
+ /* Stop sending this frame */
+ saved_size = 0;
+ }
+ else if (txdw0 & (CP_TX_TCPCS|CP_TX_UDPCS))
+ {
+ DEBUG_PRINT(("RTL8139: +++ C+ mode need TCP or UDP
checksum\n"));
- uint8_t *data_to_checksum = eth_payload_data + hlen -
12;
- // size_t data_to_checksum_len =
eth_payload_len - hlen + 12;
+ /* maximum IP header length is 60 bytes */
+ uint8_t saved_ip_header[60];
+ memcpy(saved_ip_header, eth_payload_data, hlen);
- /* add 4 TCP pseudoheader fields */
- /* copy IP source and destination fields */
- memcpy(data_to_checksum, saved_ip_header + 12, 8);
+ uint8_t *data_to_checksum = eth_payload_data + hlen - 12;
+ // size_t data_to_checksum_len =
eth_payload_len - hlen + 12;
- if ((txdw0 & CP_TX_TCPCS) && ip_protocol == IP_PROTO_TCP)
- {
- DEBUG_PRINT(("RTL8139: +++ C+ mode calculating TCP
checksum for packet with %d bytes data\n", ip_data_len));
+ /* add 4 TCP pseudoheader fields */
+ /* copy IP source and destination fields */
+ memcpy(data_to_checksum, saved_ip_header + 12, 8);
- ip_pseudo_header *p_tcpip_hdr = (ip_pseudo_header
*)data_to_checksum;
- p_tcpip_hdr->zeros = 0;
- p_tcpip_hdr->ip_proto = IP_PROTO_TCP;
- p_tcpip_hdr->ip_payload = cpu_to_be16(ip_data_len);
+ if ((txdw0 & CP_TX_TCPCS) && ip_protocol == IP_PROTO_TCP)
+ {
+ DEBUG_PRINT(("RTL8139: +++ C+ mode calculating TCP
checksum for packet with %d bytes data\n", ip_data_len));
- tcp_header* p_tcp_hdr = (tcp_header *)
(data_to_checksum+12);
+ ip_pseudo_header *p_tcpip_hdr = (ip_pseudo_header
*)data_to_checksum;
+ p_tcpip_hdr->zeros = 0;
+ p_tcpip_hdr->ip_proto = IP_PROTO_TCP;
+ p_tcpip_hdr->ip_payload = cpu_to_be16(ip_data_len);
- p_tcp_hdr->th_sum = 0;
+ tcp_header* p_tcp_hdr = (tcp_header *)
(data_to_checksum+12);
- int tcp_checksum = ip_checksum(data_to_checksum,
ip_data_len + 12);
- DEBUG_PRINT(("RTL8139: +++ C+ mode TCP checksum
%04x\n", tcp_checksum));
+ p_tcp_hdr->th_sum = 0;
- p_tcp_hdr->th_sum = tcp_checksum;
- }
- else if ((txdw0 & CP_TX_UDPCS) && ip_protocol ==
IP_PROTO_UDP)
- {
- DEBUG_PRINT(("RTL8139: +++ C+ mode calculating UDP
checksum for packet with %d bytes data\n", ip_data_len));
+ int tcp_checksum = ip_checksum(data_to_checksum,
ip_data_len + 12);
+ DEBUG_PRINT(("RTL8139: +++ C+ mode TCP checksum %04x\n",
tcp_checksum));
- ip_pseudo_header *p_udpip_hdr = (ip_pseudo_header
*)data_to_checksum;
- p_udpip_hdr->zeros = 0;
- p_udpip_hdr->ip_proto = IP_PROTO_UDP;
- p_udpip_hdr->ip_payload = cpu_to_be16(ip_data_len);
+ p_tcp_hdr->th_sum = tcp_checksum;
+ }
+ else if ((txdw0 & CP_TX_UDPCS) && ip_protocol == IP_PROTO_UDP)
+ {
+ DEBUG_PRINT(("RTL8139: +++ C+ mode calculating UDP
checksum for packet with %d bytes data\n", ip_data_len));
- udp_header *p_udp_hdr = (udp_header *)
(data_to_checksum+12);
+ ip_pseudo_header *p_udpip_hdr = (ip_pseudo_header
*)data_to_checksum;
+ p_udpip_hdr->zeros = 0;
+ p_udpip_hdr->ip_proto = IP_PROTO_UDP;
+ p_udpip_hdr->ip_payload = cpu_to_be16(ip_data_len);
- p_udp_hdr->uh_sum = 0;
+ udp_header *p_udp_hdr = (udp_header *)
(data_to_checksum+12);
- int udp_checksum = ip_checksum(data_to_checksum,
ip_data_len + 12);
- DEBUG_PRINT(("RTL8139: +++ C+ mode UDP checksum
%04x\n", udp_checksum));
+ p_udp_hdr->uh_sum = 0;
- p_udp_hdr->uh_sum = udp_checksum;
- }
+ int udp_checksum = ip_checksum(data_to_checksum,
ip_data_len + 12);
+ DEBUG_PRINT(("RTL8139: +++ C+ mode UDP checksum %04x\n",
udp_checksum));
- /* restore IP header */
- memcpy(eth_payload_data, saved_ip_header, hlen);
+ p_udp_hdr->uh_sum = udp_checksum;
}
+
+ /* restore IP header */
+ memcpy(eth_payload_data, saved_ip_header, hlen);
}
}
--
generated by git-patchbot for /home/xen/git/qemu-xen-traditional.git#stable-4.4
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