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net/dump: Add support for receive_iov function 

Adding a proper receive_iov function to the net dump module.
This will make it easier to support the dump filter feature for
the -netdev option in later patches.

Reviewed-by: Yang Hongyang <yanghy@cn.fujitsu.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Thomas Huth 2015-10-13 12:39:58 +02:00 committed by Jason Wang
parent afb4c51fad
commit 43192fcc1a
1 changed files with 21 additions and 3 deletions
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24
net/dump.c
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@ -25,6 +25,7 @@
#include "clients.h"
#include "qemu-common.h"
#include "qemu/error-report.h"
#include "qemu/iov.h"
#include "qemu/log.h"
#include "qemu/timer.h"
#include "hub.h"
@ -57,12 +58,15 @@ struct pcap_sf_pkthdr {
uint32_t len;
};
static ssize_t dump_receive(NetClientState *nc, const uint8_t *buf, size_t size)
static ssize_t dump_receive_iov(NetClientState *nc, const struct iovec *iov,
int cnt)
{
DumpState *s = DO_UPCAST(DumpState, nc, nc);
struct pcap_sf_pkthdr hdr;
int64_t ts;
int caplen;
size_t size = iov_size(iov, cnt);
struct iovec dumpiov[cnt + 1];
/* Early return in case of previous error. */
if (s->fd < 0) {
@ -76,8 +80,12 @@ static ssize_t dump_receive(NetClientState *nc, const uint8_t *buf, size_t size)
hdr.ts.tv_usec = ts % 1000000;
hdr.caplen = caplen;
hdr.len = size;
if (write(s->fd, &hdr, sizeof(hdr)) != sizeof(hdr) ||
write(s->fd, buf, caplen) != caplen) {
dumpiov[0].iov_base = &hdr;
dumpiov[0].iov_len = sizeof(hdr);
cnt = iov_copy(&dumpiov[1], cnt, iov, cnt, 0, caplen);
if (writev(s->fd, dumpiov, cnt + 1) != sizeof(hdr) + caplen) {
qemu_log("-net dump write error - stop dump\n");
close(s->fd);
s->fd = -1;
@ -86,6 +94,15 @@ static ssize_t dump_receive(NetClientState *nc, const uint8_t *buf, size_t size)
return size;
}
static ssize_t dump_receive(NetClientState *nc, const uint8_t *buf, size_t size)
{
struct iovec iov = {
.iov_base = (void *)buf,
.iov_len = size
};
return dump_receive_iov(nc, &iov, 1);
}
static void dump_cleanup(NetClientState *nc)
{
DumpState *s = DO_UPCAST(DumpState, nc, nc);
@ -97,6 +114,7 @@ static NetClientInfo net_dump_info = {
.type = NET_CLIENT_OPTIONS_KIND_DUMP,
.size = sizeof(DumpState),
.receive = dump_receive,
.receive_iov = dump_receive_iov,
.cleanup = dump_cleanup,
};