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Cleaned up payload length determination.

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This commit is contained in:
Mark Pizzolato 2011-08-13 10:29:44 -07:00
parent 015f2bb82e
commit 3a61487a2d
1 changed files with 12 additions and 6 deletions
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18
sim_ether.c
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@ -1971,8 +1971,12 @@ _eth_fix_ip_jumbo_offload(ETH_DEV* dev, const u_char* msg, int len)
case IPPROTO_UDP: case IPPROTO_UDP:
case IPPROTO_ICMP: case IPPROTO_ICMP:
++dev->jumbo_fragmented; ++dev->jumbo_fragmented;
payload_len = ntohs(IP->total_len) - IP_HLEN(IP); /* When we're performing LSO (Large Send Offload), we're given a
mtu_payload = ETH_MIN_JUMBO_FRAME - 14 - IP_HLEN(IP); 'template' header which may not include a value being populated
in the IP header length (which is only 16 bits).
We process as payload everything which isn't known header data. */
payload_len = len - (14 + IP_HLEN(IP));
mtu_payload = ETH_MIN_JUMBO_FRAME - (14 + IP_HLEN(IP));
frag_offset = 0; frag_offset = 0;
while (payload_len > 0) { while (payload_len > 0) {
ip_flags = frag_offset; ip_flags = frag_offset;
@ -2019,10 +2023,12 @@ _eth_fix_ip_jumbo_offload(ETH_DEV* dev, const u_char* msg, int len)
eth_packet_trace_ex (dev, ((u_char *)IP)-14, len, "Fragmenting Jumbo TCP segment", 1, dev->dbit); eth_packet_trace_ex (dev, ((u_char *)IP)-14, len, "Fragmenting Jumbo TCP segment", 1, dev->dbit);
TCP = (struct TCPHeader *)(((char *)IP)+IP_HLEN(IP)); TCP = (struct TCPHeader *)(((char *)IP)+IP_HLEN(IP));
orig_tcp_flags = ntohs(TCP->data_offset_and_flags); orig_tcp_flags = ntohs(TCP->data_offset_and_flags);
if (0 == ntohs(IP->total_len)) /* Sometimes the IP header indicates a packet size of 0 */ /* When we're performing LSO (Large Send Offload), we're given a
IP->total_len = htons(len-14); /* use the captured frame size to compute the IP length */ 'template' header which may not include a value being populated
payload_len = ntohs(IP->total_len) - (IP_HLEN(IP) + TCP_DATA_OFFSET(TCP)); in the IP header length (which is only 16 bits).
mtu_payload = ETH_MIN_JUMBO_FRAME - 14 - IP_HLEN(IP) - TCP_DATA_OFFSET(TCP); We process as payload everything which isn't known header data. */
payload_len = len - (14 + IP_HLEN(IP) + TCP_DATA_OFFSET(TCP));
mtu_payload = ETH_MIN_JUMBO_FRAME - (14 + IP_HLEN(IP) + TCP_DATA_OFFSET(TCP));
while (payload_len > 0) { while (payload_len > 0) {
if (payload_len > mtu_payload) { if (payload_len > mtu_payload) {
TCP->data_offset_and_flags = htons(orig_tcp_flags&~(TCP_PSH_FLAG|TCP_FIN_FLAG|TCP_RST_FLAG)); TCP->data_offset_and_flags = htons(orig_tcp_flags&~(TCP_PSH_FLAG|TCP_FIN_FLAG|TCP_RST_FLAG));