selftests/net: revert the zerocopy Rx path for PF_RDS

In preparation for optimized reception of zerocopy completion,
revert the Rx side changes introduced by Commit dfb8434b
("selftests/net: add zerocopy support for PF_RDS test case")
Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

tools/testing/selftests/net/msg_zerocopy.c

@@ -344,26 +344,6 @@ static int do_setup_tx(int domain, int type, int protocol)
 	return fd;
 }
 
-static int do_process_zerocopy_cookies(struct sock_extended_err *serr,
-				       uint32_t *ckbuf, size_t nbytes)
-{
-	int ncookies, i;
-
-	if (serr->ee_errno != 0)
-		error(1, 0, "serr: wrong error code: %u", serr->ee_errno);
-	ncookies = serr->ee_data;
-	if (ncookies > SO_EE_ORIGIN_MAX_ZCOOKIES)
-		error(1, 0, "Returned %d cookies, max expected %d\n",
-		      ncookies, SO_EE_ORIGIN_MAX_ZCOOKIES);
-	if (nbytes != ncookies * sizeof(uint32_t))
-		error(1, 0, "Expected %d cookies, got %ld\n",
-		      ncookies, nbytes/sizeof(uint32_t));
-	for (i = 0; i < ncookies; i++)
-		if (cfg_verbose >= 2)
-			fprintf(stderr, "%d\n", ckbuf[i]);
-	return ncookies;
-}
-
 static bool do_recv_completion(int fd)
 {
 	struct sock_extended_err *serr;
@@ -372,17 +352,10 @@ static bool do_recv_completion(int fd)
 	uint32_t hi, lo, range;
 	int ret, zerocopy;
 	char control[100];
-	uint32_t ckbuf[SO_EE_ORIGIN_MAX_ZCOOKIES];
-	struct iovec iov;
 
 	msg.msg_control = control;
 	msg.msg_controllen = sizeof(control);
 
-	iov.iov_base = ckbuf;
-	iov.iov_len = (SO_EE_ORIGIN_MAX_ZCOOKIES * sizeof(ckbuf[0]));
-	msg.msg_iov = &iov;
-	msg.msg_iovlen = 1;
-
 	ret = recvmsg(fd, &msg, MSG_ERRQUEUE);
 	if (ret == -1 && errno == EAGAIN)
 		return false;
@@ -402,10 +375,6 @@ static bool do_recv_completion(int fd)
 
 	serr = (void *) CMSG_DATA(cm);
 
-	if (serr->ee_origin == SO_EE_ORIGIN_ZCOOKIE) {
-		completions += do_process_zerocopy_cookies(serr, ckbuf, ret);
-		return true;
-	}
 	if (serr->ee_origin != SO_EE_ORIGIN_ZEROCOPY)
 		error(1, 0, "serr: wrong origin: %u", serr->ee_origin);
 	if (serr->ee_errno != 0)
@@ -631,40 +600,6 @@ static void do_flush_datagram(int fd, int type)
 	bytes += cfg_payload_len;
 }
 
-
-static void do_recvmsg(int fd)
-{
-	int ret, off = 0;
-	char *buf;
-	struct iovec iov;
-	struct msghdr msg;
-	struct sockaddr_storage din;
-
-	buf = calloc(cfg_payload_len, sizeof(char));
-	iov.iov_base = buf;
-	iov.iov_len = cfg_payload_len;
-
-	memset(&msg, 0, sizeof(msg));
-	msg.msg_name = &din;
-	msg.msg_namelen = sizeof(din);
-	msg.msg_iov = &iov;
-	msg.msg_iovlen = 1;
-
-	ret = recvmsg(fd, &msg, MSG_TRUNC);
-
-	if (ret == -1)
-		error(1, errno, "recv");
-	if (ret != cfg_payload_len)
-		error(1, 0, "recv: ret=%u != %u", ret, cfg_payload_len);
-
-	if (memcmp(buf + off, payload, ret))
-		error(1, 0, "recv: data mismatch");
-
-	free(buf);
-	packets++;
-	bytes += cfg_payload_len;
-}
-
 static void do_rx(int domain, int type, int protocol)
 {
 	uint64_t tstop;
@@ -676,8 +611,6 @@ static void do_rx(int domain, int type, int protocol)
 	do {
 		if (type == SOCK_STREAM)
 			do_flush_tcp(fd);
-		else if (domain == PF_RDS)
-			do_recvmsg(fd);
 		else
 			do_flush_datagram(fd, type);