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transport: Introduce transmit time stamp deferral. 

Up until now, the code has always fetched the time stamp immediately
after transmitting a message.  However, a transparent clock will want
to forward a given incoming message out all egress ports with as
little delay as possible, in order to minimize the residence time of
the message within the switch.

This patch adds a new transmit mode for event messages that will be
used to signal the new behavior.

Signed-off-by: Richard Cochran <richardcochran@gmail.com>
master
Richard Cochran 2018-03-17 09:30:04 -07:00
parent a1c5e3f2ed
commit e160bad721
4 changed files with 42 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
raw.c
View File

@ -296,9 +296,21 @@ static int raw_send(struct transport *t, struct fdarray *fda,
{ {
struct raw *raw = container_of(t, struct raw, t); struct raw *raw = container_of(t, struct raw, t);
ssize_t cnt; ssize_t cnt;
int fd = event ? fda->fd[FD_EVENT] : fda->fd[FD_GENERAL];
unsigned char pkt[1600], *ptr = buf; unsigned char pkt[1600], *ptr = buf;
struct eth_hdr *hdr; struct eth_hdr *hdr;
int fd = -1;
switch (event) {
case TRANS_GENERAL:
fd = fda->fd[FD_GENERAL];
break;
case TRANS_EVENT:
case TRANS_ONESTEP:
case TRANS_P2P1STEP:
case TRANS_DEFER_EVENT:
fd = fda->fd[FD_EVENT];
break;
}
ptr -= sizeof(*hdr); ptr -= sizeof(*hdr);
len += sizeof(*hdr); len += sizeof(*hdr);

1
transport.h
View File

@ -50,6 +50,7 @@ enum transport_event {
TRANS_EVENT, TRANS_EVENT,
TRANS_ONESTEP, TRANS_ONESTEP,
TRANS_P2P1STEP, TRANS_P2P1STEP,
TRANS_DEFER_EVENT,
}; };
struct transport; struct transport;

16
udp.c
View File

@ -219,10 +219,22 @@ static int udp_send(struct transport *t, struct fdarray *fda,
enum transport_event event, int peer, void *buf, int len, enum transport_event event, int peer, void *buf, int len,
struct address *addr, struct hw_timestamp *hwts) struct address *addr, struct hw_timestamp *hwts)
{ {
ssize_t cnt;
int fd = event ? fda->fd[FD_EVENT] : fda->fd[FD_GENERAL];
struct address addr_buf; struct address addr_buf;
unsigned char junk[1600]; unsigned char junk[1600];
ssize_t cnt;
int fd = -1;
switch (event) {
case TRANS_GENERAL:
fd = fda->fd[FD_GENERAL];
break;
case TRANS_EVENT:
case TRANS_ONESTEP:
case TRANS_P2P1STEP:
case TRANS_DEFER_EVENT:
fd = fda->fd[FD_EVENT];
break;
}
if (!addr) { if (!addr) {
memset(&addr_buf, 0, sizeof(addr_buf)); memset(&addr_buf, 0, sizeof(addr_buf));

16
udp6.c
View File

@ -230,10 +230,22 @@ static int udp6_send(struct transport *t, struct fdarray *fda,
struct address *addr, struct hw_timestamp *hwts) struct address *addr, struct hw_timestamp *hwts)
{ {
struct udp6 *udp6 = container_of(t, struct udp6, t); struct udp6 *udp6 = container_of(t, struct udp6, t);
ssize_t cnt;
int fd = event ? fda->fd[FD_EVENT] : fda->fd[FD_GENERAL];
struct address addr_buf; struct address addr_buf;
unsigned char junk[1600]; unsigned char junk[1600];
ssize_t cnt;
int fd = -1;
switch (event) {
case TRANS_GENERAL:
fd = fda->fd[FD_GENERAL];
break;
case TRANS_EVENT:
case TRANS_ONESTEP:
case TRANS_P2P1STEP:
case TRANS_DEFER_EVENT:
fd = fda->fd[FD_EVENT];
break;
}
if (!addr) { if (!addr) {
memset(&addr_buf, 0, sizeof(addr_buf)); memset(&addr_buf, 0, sizeof(addr_buf));