[PATCH] app/testpmd: fix UDP cksum error for UFO enable

[Huisong Li <lihuisong@huawei.com>]

The command "tso set <tso_segsz> <port_id>" is used to enable UFO, please
see commit ce8e6e742807 ("app/testpmd: support UFO in checksum engine")

The above patch configures the RTE_MBUF_F_TX_UDP_SEG to enable UFO only if
tso_segsz is set. Then tx_prepare() may call rte_net_intel_cksum_prepare()
to compute pseudo header checksum (because some PMDs may supports TSO).
As a result, if the peer sends UDP packets, all packets with UDP checksum
error are received for the PMDs only supported TSO.

So enabling UFO also depends on if driver has RTE_ETH_TX_OFFLOAD_UDP_TSO
capability. Similarly, TSO also need to do like this.

In addition, this patch also fixes cmd_tso_set_parsed() for UFO to make
it better to support TSO and UFO.

Fixes: ce8e6e742807 ("app/testpmd: support UFO in checksum engine")

Signed-off-by: Huisong Li <lihuisong@huawei.com>
---
 app/test-pmd/cmdline.c  | 47 +++++++++++++++++++++--------------------
 app/test-pmd/csumonly.c |  4 ++--
 2 files changed, 26 insertions(+), 25 deletions(-)

diff --git a/app/test-pmd/cmdline.c b/app/test-pmd/cmdline.c
index 0d0723f659..8be593d405 100644
--- a/app/test-pmd/cmdline.c
+++ b/app/test-pmd/cmdline.c
@@ -4906,6 +4906,7 @@ cmd_tso_set_parsed(void *parsed_result,
 {
 	struct cmd_tso_set_result *res = parsed_result;
 	struct rte_eth_dev_info dev_info;
+	uint64_t offloads;
 	int ret;
 
 	if (port_id_is_invalid(res->port_id, ENABLED_WARN))
@@ -4922,37 +4923,37 @@ cmd_tso_set_parsed(void *parsed_result,
 	if (ret != 0)
 		return;
 
-	if ((ports[res->port_id].tso_segsz != 0) &&
-		(dev_info.tx_offload_capa & RTE_ETH_TX_OFFLOAD_TCP_TSO) == 0) {
-		fprintf(stderr, "Error: TSO is not supported by port %d\n",
-			res->port_id);
-		return;
+	if (ports[res->port_id].tso_segsz != 0) {
+		if ((dev_info.tx_offload_capa & (RTE_ETH_TX_OFFLOAD_TCP_TSO |
+					RTE_ETH_TX_OFFLOAD_UDP_TSO)) == 0) {
+			fprintf(stderr, "Error: both TSO and UFO are not supported by port %d\n",
+				res->port_id);
+			return;
+		}
+		/* display warnings if configuration is not supported by the NIC */
+		if ((dev_info.tx_offload_capa & RTE_ETH_TX_OFFLOAD_TCP_TSO) == 0)
+			fprintf(stderr, "Warning: port %d doesn't support TSO\n",
+				res->port_id);
+		if ((dev_info.tx_offload_capa & RTE_ETH_TX_OFFLOAD_UDP_TSO) == 0)
+			fprintf(stderr, "Warning: port %d doesn't support UFO\n",
+				res->port_id);
 	}
 
 	if (ports[res->port_id].tso_segsz == 0) {
 		ports[res->port_id].dev_conf.txmode.offloads &=
-						~RTE_ETH_TX_OFFLOAD_TCP_TSO;
-		printf("TSO for non-tunneled packets is disabled\n");
+			~(RTE_ETH_TX_OFFLOAD_TCP_TSO | RTE_ETH_TX_OFFLOAD_UDP_TSO);
+		printf("TSO and UFO for non-tunneled packets is disabled\n");
 	} else {
-		ports[res->port_id].dev_conf.txmode.offloads |=
-						RTE_ETH_TX_OFFLOAD_TCP_TSO;
-		printf("TSO segment size for non-tunneled packets is %d\n",
+		offloads = (dev_info.tx_offload_capa & RTE_ETH_TX_OFFLOAD_TCP_TSO) ?
+					RTE_ETH_TX_OFFLOAD_TCP_TSO : 0;
+		offloads |= (dev_info.tx_offload_capa & RTE_ETH_TX_OFFLOAD_UDP_TSO) ?
+					RTE_ETH_TX_OFFLOAD_UDP_TSO : 0;
+		ports[res->port_id].dev_conf.txmode.offloads |= offloads;
+		printf("segment size for non-tunneled packets is %d\n",
 			ports[res->port_id].tso_segsz);
 	}
-	cmd_config_queue_tx_offloads(&ports[res->port_id]);
-
-	/* display warnings if configuration is not supported by the NIC */
-	ret = eth_dev_info_get_print_err(res->port_id, &dev_info);
-	if (ret != 0)
-		return;
-
-	if ((ports[res->port_id].tso_segsz != 0) &&
-		(dev_info.tx_offload_capa & RTE_ETH_TX_OFFLOAD_TCP_TSO) == 0) {
-		fprintf(stderr,
-			"Warning: TSO enabled but not supported by port %d\n",
-			res->port_id);
-	}
 
+	cmd_config_queue_tx_offloads(&ports[res->port_id]);
 	cmd_reconfig_device_queue(res->port_id, 1, 1);
 }
 
diff --git a/app/test-pmd/csumonly.c b/app/test-pmd/csumonly.c
index c103e54111..0c007bd178 100644
--- a/app/test-pmd/csumonly.c
+++ b/app/test-pmd/csumonly.c
@@ -505,7 +505,7 @@ process_inner_cksums(void *l3_hdr, const struct testpmd_offload_info *info,
 		udp_hdr = (struct rte_udp_hdr *)((char *)l3_hdr + info->l3_len);
 		/* do not recalculate udp cksum if it was 0 */
 		if (udp_hdr->dgram_cksum != 0) {
-			if (tso_segsz)
+			if (tso_segsz && (tx_offloads & RTE_ETH_TX_OFFLOAD_UDP_TSO))
 				ol_flags |= RTE_MBUF_F_TX_UDP_SEG;
 			else if (tx_offloads & RTE_ETH_TX_OFFLOAD_UDP_CKSUM) {
 				ol_flags |= RTE_MBUF_F_TX_UDP_CKSUM;
@@ -528,7 +528,7 @@ process_inner_cksums(void *l3_hdr, const struct testpmd_offload_info *info,
 #endif
 	} else if (info->l4_proto == IPPROTO_TCP) {
 		tcp_hdr = (struct rte_tcp_hdr *)((char *)l3_hdr + info->l3_len);
-		if (tso_segsz)
+		if (tso_segsz && (tx_offloads & RTE_ETH_TX_OFFLOAD_TCP_TSO))
 			ol_flags |= RTE_MBUF_F_TX_TCP_SEG;
 		else if (tx_offloads & RTE_ETH_TX_OFFLOAD_TCP_CKSUM) {
 			ol_flags |= RTE_MBUF_F_TX_TCP_CKSUM;
-- 
2.33.0