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fix transmit side checksum offloading to not generate a pseudo header.

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dev/ns_gige.cc:
    transmit side checksum offloading doesn't need pseudo header generation, it just takes the pseudo header checksum and uses it.

--HG--
extra : convert_revision : 9741bd650415c18ed37b06a453b23610d028135b
This commit is contained in:
Lisa Hsu
2004-06-30 00:50:56 -04:00
parent 38fe4d9a86
commit 167c57f265
1 changed files with 19 additions and 8 deletions
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27
dev/ns_gige.cc
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@@ -1780,7 +1780,8 @@ NSGigE::txKick()
udpChecksum(txPacket, true);
} else if (txDescCache.extsts & EXTSTS_TCPPKT) {
tcpChecksum(txPacket, true);
} else if (txDescCache.extsts & EXTSTS_IPPKT) {
}
if (txDescCache.extsts & EXTSTS_IPPKT) {
ipChecksum(txPacket, true);
}
}
@@ -2043,15 +2044,25 @@ NSGigE::tcpChecksum(PacketPtr packet, bool gen)
ip_header *ip = packet->getIpHdr();
tcp_header *hdr = packet->getTcpHdr(ip);
uint16_t cksum;
pseudo_header *pseudo = new pseudo_header;
if (!gen) {
pseudo->src_ip_addr = ip->src_ip_addr;
pseudo->dest_ip_addr = ip->dest_ip_addr;
pseudo->protocol = reverseEnd16(ip->protocol);
pseudo->len = reverseEnd16(reverseEnd16(ip->dgram_len) - (ip->vers_len & 0xf)*4);
pseudo->src_ip_addr = ip->src_ip_addr;
pseudo->dest_ip_addr = ip->dest_ip_addr;
pseudo->protocol = reverseEnd16(ip->protocol);
pseudo->len = reverseEnd16(reverseEnd16(ip->dgram_len) - (ip->vers_len & 0xf)*4);
uint16_t cksum = checksumCalc((uint16_t *) pseudo, (uint16_t *) hdr,
cksum = checksumCalc((uint16_t *) pseudo, (uint16_t *) hdr,
(uint32_t) reverseEnd16(pseudo->len));
} else {
pseudo->src_ip_addr = 0;
pseudo->dest_ip_addr = 0;
pseudo->protocol = hdr->chksum;
pseudo->len = 0;
hdr->chksum = 0;
cksum = checksumCalc((uint16_t *) pseudo, (uint16_t *) hdr,
(uint32_t) (reverseEnd16(ip->dgram_len) - (ip->vers_len & 0xf)*4));
}
delete pseudo;
if (gen)
@@ -2071,7 +2082,7 @@ NSGigE::ipChecksum(PacketPtr packet, bool gen)
uint16_t cksum = checksumCalc(NULL, (uint16_t *) hdr, (hdr->vers_len & 0xf)*4);
if (gen) {
DPRINTF(Ethernet, "generated checksum: %#x\n", cksum);
DPRINTF(EthernetCksum, "generated checksum: %#x\n", cksum);
hdr->hdr_chksum = cksum;
}
else