On Thu, May 23, 2019 at 5:11 PM Fred Klassen fklassen@appneta.com wrote:
This enhancement adds options that facilitate load testing with additional TX CMSG options, and to optionally print results of various send CMSG operations.
These options are especially useful in isolating situations where error-queue messages are lost when combined with other CMSG operations (e.g. SO_ZEROCOPY).
New options:
-T - add TX CMSG that requests TX software timestamps -H - similar to -T except request TX hardware timestamps -q - add IP_TOS/IPV6_TCLASS TX CMSG
To ensure that we do not regress, when adding options, please consider (just a general suggestion, not a strong request for this patch set) updating the kselftest to run a variant of the test with the new code coverage. In this case, make the code pass/fail instead of only user interpretable and add variants to udpgso.sh.
-P - call poll() before reading error queue -v - print detailed resultsFixes: 3a687bef148d ("selftests: udp gso benchmark") Signed-off-by: Fred Klassen fklassen@appneta.com
+static void flush_errqueue_recv(int fd) { struct msghdr msg = {0}; /* flush */
struct cmsghdr *cmsg;struct iovec entry;char control[1024];
can use more precise CMSG_SPACE based on worst case expectations, like in udp_sendmmsg
char buf[1500];
no need for payload
+static void flush_errqueue(int fd) +{
if (cfg_poll) {struct pollfd fds = { 0 };int ret;fds.fd = fd;fds.events = POLLERR;
no need to pass POLLERR, it is always returned in revents.