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Add a flag to ip_output() - IP_NODEFAULTFLOWID - which prevents it from

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overriding an existing flowid/flowtype field in the outbound mbuf with
the inp_flowid/inp_flowtype details.

The upcoming RSS UDP support calculates a valid RSS value for outbound
mbufs and since it may change per send, it doesn't cache it in the inpcb.
So overriding it here would be wrong.

Differential Revision:	https://reviews.freebsd.org/D527
Reviewed by:	grehan
This commit is contained in:
Adrian Chadd 2014-09-09 00:19:02 +00:00
parent ac25e23856
commit 061a4b4c36
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=271291
2 changed files with 3 additions and 1 deletions
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3
sys/netinet/ip_output.c
View File

@ -145,7 +145,8 @@ ip_output(struct mbuf *m, struct mbuf *opt, struct route *ro, int flags,
if (inp != NULL) {
INP_LOCK_ASSERT(inp);
M_SETFIB(m, inp->inp_inc.inc_fibnum);
if (inp->inp_flags & (INP_HW_FLOWID|INP_SW_FLOWID)) {
if (((flags & IP_NODEFAULTFLOWID) == 0) &&
inp->inp_flags & (INP_HW_FLOWID|INP_SW_FLOWID)) {
m->m_pkthdr.flowid = inp->inp_flowid;
M_HASHTYPE_SET(m, inp->inp_flowtype);
m->m_flags |= M_FLOWID;

1
sys/netinet/ip_var.h
View File

@ -161,6 +161,7 @@ void kmod_ipstat_dec(int statnum);
#define IP_SENDTOIF 0x8 /* send on specific ifnet */
#define IP_ROUTETOIF SO_DONTROUTE /* 0x10 bypass routing tables */
#define IP_ALLOWBROADCAST SO_BROADCAST /* 0x20 can send broadcast packets */
#define IP_NODEFAULTFLOWID 0x40 /* Don't set the flowid from inp */
#ifdef __NO_STRICT_ALIGNMENT
#define IP_HDR_ALIGNED_P(ip) 1