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slirp: Keep next_m always valid

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Make sure that next_m always points to a packet if batchq is non-empty.
This will simplify walking the queues in if_start.

CC: Fabien Chouteau <chouteau@adacore.com>
CC: Zhi Yong Wu <wuzhy@linux.vnet.ibm.com>
CC: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
This commit is contained in:
Jan Kiszka 2012-02-29 09:27:33 +01:00
parent cb72b75824
commit d6536b2c97
1 changed files with 14 additions and 8 deletions
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22
slirp/if.c
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@ -96,8 +96,13 @@ if_output(struct socket *so, struct mbuf *ifm)
ifs_insque(ifm, ifq->ifs_prev);
goto diddit;
}
} else
} else {
ifq = slirp->if_batchq.ifq_prev;
/* Set next_m if the queue was empty so far */
if (slirp->next_m == &slirp->if_batchq) {
slirp->next_m = ifm;
}
}
/* Create a new doubly linked list for this session */
ifm->ifq_so = so;
@ -170,13 +175,8 @@ void if_start(Slirp *slirp)
if (slirp->if_fastq.ifq_next != &slirp->if_fastq) {
ifm = slirp->if_fastq.ifq_next;
} else {
/* Nothing on fastq, see if next_m is valid */
if (slirp->next_m != &slirp->if_batchq) {
ifm = slirp->next_m;
} else {
ifm = slirp->if_batchq.ifq_next;
}
/* Nothing on fastq, pick up from batchq via next_m */
ifm = slirp->next_m;
from_batchq = true;
}
@ -202,6 +202,12 @@ void if_start(Slirp *slirp)
if (ifm->ifs_next != ifm) {
insque(ifm->ifs_next, ifqt);
ifs_remque(ifm);
/* Set next_m if the session packet is now the only one on
* batchq */
if (ifqt == &slirp->if_batchq &&
slirp->next_m == &slirp->if_batchq) {
slirp->next_m = ifm->ifs_next;
}
}
/* Update so_queued */