libsa: Fix IP recv timeout
readip() doesn't, at the moment, properly indicate to callers that it has timed out. One can tell that it's timed out if errno == EAGAIN when it returns, but this is not ideal. Restructure it a little bit to explicitly set errno to ETIMEDOUT if we've exhausted tleft. I found two places that care about where it timed out or not: sendrecv in net.c and sendrecv_tftp. Both are structured to pass smaller timeout values to readip while tracking a larger timeout. Neither of them were able to do this properly with readip not indicating ETIMEDOUT, so fix it. While here, straighten out the time (t/t1) usage in sendrecv_tftp. This would have manifested itself in periodic failures to NFS/TFTP boot for no apparent reason because MINTMO/MAXTMO were not actually being respected properly. Problems were not reported with NFS, only TFTP. Reported by: sbruno Reviewed by: sbruno, tsoome MFC after: 3 days Differential Revision: https://reviews.freebsd.org/D14350
This commit is contained in:
parent
d793587fe2
commit
502b7cf99b
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=329264
@ -416,8 +416,13 @@ readip(struct iodesc *d, void **pkt, void **payload, time_t tleft,
|
||||
while ((getsecs() - t) < tleft) {
|
||||
errno = 0;
|
||||
ret = readipv4(d, pkt, payload, tleft, proto);
|
||||
if (ret >= 0)
|
||||
return (ret);
|
||||
/* Bubble up the error if it wasn't successful */
|
||||
if (errno != EAGAIN)
|
||||
break;
|
||||
return (-1);
|
||||
}
|
||||
return (ret);
|
||||
/* We've exhausted tleft; timeout */
|
||||
errno = ETIMEDOUT;
|
||||
return (-1);
|
||||
}
|
||||
|
@ -118,7 +118,7 @@ sendrecv(struct iodesc *d,
|
||||
/* Try to get a packet and process it. */
|
||||
cc = (*rproc)(d, pkt, payload, tleft);
|
||||
/* Return on data, EOF or real error. */
|
||||
if (cc != -1 || errno != 0)
|
||||
if (cc != -1 || (errno != 0 && errno != ETIMEDOUT))
|
||||
return (cc);
|
||||
|
||||
/* Timed out or didn't get the packet we're waiting for */
|
||||
|
@ -638,14 +638,20 @@ sendrecv_tftp(struct tftp_handle *h,
|
||||
if (cc == -1) {
|
||||
/* Error on transmit; wait before retrying */
|
||||
while ((getsecs() - t1) < tleft);
|
||||
t1 = getsecs();
|
||||
continue;
|
||||
}
|
||||
|
||||
t = t1 = getsecs();
|
||||
recvnext:
|
||||
if ((getsecs() - t) > MAXTMO) {
|
||||
errno = ETIMEDOUT;
|
||||
return -1;
|
||||
}
|
||||
/* Try to get a packet and process it. */
|
||||
cc = (*rproc)(h, pkt, payload, tleft, rtype);
|
||||
/* Return on data, EOF or real error. */
|
||||
if (cc != -1 || errno != 0)
|
||||
if (cc != -1 || (errno != 0 && errno != ETIMEDOUT))
|
||||
return (cc);
|
||||
if ((getsecs() - t1) < tleft) {
|
||||
goto recvnext;
|
||||
|
Loading…
Reference in New Issue
Block a user