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Don't calculate checksum if it has already been validated

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Obtained from:	Chelsio Inc.
MFC after:	3 days
This commit is contained in:
Kip Macy 2008-08-24 02:31:09 +00:00
parent 4b8e067a75
commit 4570959392
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=182089
1 changed files with 14 additions and 6 deletions
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20
sys/netinet/tcp_lro.c
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@ -184,7 +184,7 @@ tcp_lro_rx(struct lro_ctrl *cntl, struct mbuf *m_head, uint32_t csum)
struct mbuf *m_nxt, *m_tail;
struct lro_entry *lro;
int hlen, ip_len, tcp_hdr_len, tcp_data_len, tot_len;
int opt_bytes, trim;
int opt_bytes, trim, csum_flags;
uint32_t seq, tmp_csum, device_mtu;
@ -204,12 +204,20 @@ tcp_lro_rx(struct lro_ctrl *cntl, struct mbuf *m_head, uint32_t csum)
return -1;
/* verify that the IP header checksum is correct */
tmp_csum = do_csum_data((uint16_t *)ip, sizeof (*ip));
if (__predict_false((tmp_csum ^ 0xffff) != 0)) {
cntl->lro_bad_csum++;
return -1;
csum_flags = m_head->m_pkthdr.csum_flags;
if (csum_flags & CSUM_IP_CHECKED) {
if (__predict_false((csum_flags & CSUM_IP_VALID) == 0)) {
cntl->lro_bad_csum++;
return -1;
}
} else {
tmp_csum = do_csum_data((uint16_t *)ip, sizeof (*ip));
if (__predict_false((tmp_csum ^ 0xffff) != 0)) {
cntl->lro_bad_csum++;
return -1;
}
}
/* find the TCP header */
tcp = (struct tcphdr *) (ip + 1);