[dpdk-stable] patch 'net/tap: fix zeroed flow mask configurations' has been queued to stable release 18.05.1

[Christian Ehrhardt]

Hi,

FYI, your patch has been queued to stable release 18.05.1

Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet.
It will be pushed if I get no objections before 08/16/18. So please
shout if anyone has objections.

Thanks.

Christian Ehrhardt <christian.ehrhardt at canonical.com>

---
>From 7a30ead394d74ccaa3d5d46bafa9025b9ea1fd32 Mon Sep 17 00:00:00 2001
From: Matan Azrad <matan at mellanox.com>
Date: Mon, 6 Aug 2018 10:58:47 +0000
Subject: [PATCH] net/tap: fix zeroed flow mask configurations

[ upstream commit 4278f8df470fa76259ed8d1fd52d4995d9fb6557 ]

The rte_flow meaning of zero flow mask configuration is to match all
the range of the item value.
For example, the flow eth / ipv4 dst spec 1.2.3.4 dst mask 0.0.0.0
should much all the ipv4 traffic from the rte_flow API perspective.

>From some kernel perspectives the above rule means to ignore all the
ipv4 traffic (e.g. Ubuntu 16.04, 4.15.10).

Due to the fact that the tap PMD should provide the rte_flow meaning,
it is necessary to ignore the spec in case the mask is zero when it
forwards such like flows to the kernel.
So, the above rule should be translated to eth / ipv4 to get the
correct meaning.

Ignore spec configurations when the mask is zero.

Fixes: de96fe68ae95 ("net/tap: add basic flow API patterns and actions")

Signed-off-by: Matan Azrad <matan at mellanox.com>
Acked-by: Adrien Mazarguil <adrien.mazarguil at 6wind.com>
---
 drivers/net/tap/tap_flow.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/net/tap/tap_flow.c b/drivers/net/tap/tap_flow.c
index 6b60e6dc5..0e01af62a 100644
--- a/drivers/net/tap/tap_flow.c
+++ b/drivers/net/tap/tap_flow.c
@@ -537,7 +537,7 @@ tap_flow_create_eth(const struct rte_flow_item *item, void *data)
 	if (!flow)
 		return 0;
 	msg = &flow->msg;
-	if (!is_zero_ether_addr(&spec->dst)) {
+	if (!is_zero_ether_addr(&mask->dst)) {
 		tap_nlattr_add(&msg->nh, TCA_FLOWER_KEY_ETH_DST, ETHER_ADDR_LEN,
 			   &spec->dst.addr_bytes);
 		tap_nlattr_add(&msg->nh,
@@ -651,13 +651,13 @@ tap_flow_create_ipv4(const struct rte_flow_item *item, void *data)
 		info->eth_type = htons(ETH_P_IP);
 	if (!spec)
 		return 0;
-	if (spec->hdr.dst_addr) {
+	if (mask->hdr.dst_addr) {
 		tap_nlattr_add32(&msg->nh, TCA_FLOWER_KEY_IPV4_DST,
 			     spec->hdr.dst_addr);
 		tap_nlattr_add32(&msg->nh, TCA_FLOWER_KEY_IPV4_DST_MASK,
 			     mask->hdr.dst_addr);
 	}
-	if (spec->hdr.src_addr) {
+	if (mask->hdr.src_addr) {
 		tap_nlattr_add32(&msg->nh, TCA_FLOWER_KEY_IPV4_SRC,
 			     spec->hdr.src_addr);
 		tap_nlattr_add32(&msg->nh, TCA_FLOWER_KEY_IPV4_SRC_MASK,
@@ -707,13 +707,13 @@ tap_flow_create_ipv6(const struct rte_flow_item *item, void *data)
 		info->eth_type = htons(ETH_P_IPV6);
 	if (!spec)
 		return 0;
-	if (memcmp(spec->hdr.dst_addr, empty_addr, 16)) {
+	if (memcmp(mask->hdr.dst_addr, empty_addr, 16)) {
 		tap_nlattr_add(&msg->nh, TCA_FLOWER_KEY_IPV6_DST,
 			   sizeof(spec->hdr.dst_addr), &spec->hdr.dst_addr);
 		tap_nlattr_add(&msg->nh, TCA_FLOWER_KEY_IPV6_DST_MASK,
 			   sizeof(mask->hdr.dst_addr), &mask->hdr.dst_addr);
 	}
-	if (memcmp(spec->hdr.src_addr, empty_addr, 16)) {
+	if (memcmp(mask->hdr.src_addr, empty_addr, 16)) {
 		tap_nlattr_add(&msg->nh, TCA_FLOWER_KEY_IPV6_SRC,
 			   sizeof(spec->hdr.src_addr), &spec->hdr.src_addr);
 		tap_nlattr_add(&msg->nh, TCA_FLOWER_KEY_IPV6_SRC_MASK,
@@ -762,10 +762,10 @@ tap_flow_create_udp(const struct rte_flow_item *item, void *data)
 	tap_nlattr_add8(&msg->nh, TCA_FLOWER_KEY_IP_PROTO, IPPROTO_UDP);
 	if (!spec)
 		return 0;
-	if (spec->hdr.dst_port & mask->hdr.dst_port)
+	if (mask->hdr.dst_port)
 		tap_nlattr_add16(&msg->nh, TCA_FLOWER_KEY_UDP_DST,
 			     spec->hdr.dst_port);
-	if (spec->hdr.src_port & mask->hdr.src_port)
+	if (mask->hdr.src_port)
 		tap_nlattr_add16(&msg->nh, TCA_FLOWER_KEY_UDP_SRC,
 			     spec->hdr.src_port);
 	return 0;
@@ -808,10 +808,10 @@ tap_flow_create_tcp(const struct rte_flow_item *item, void *data)
 	tap_nlattr_add8(&msg->nh, TCA_FLOWER_KEY_IP_PROTO, IPPROTO_TCP);
 	if (!spec)
 		return 0;
-	if (spec->hdr.dst_port & mask->hdr.dst_port)
+	if (mask->hdr.dst_port)
 		tap_nlattr_add16(&msg->nh, TCA_FLOWER_KEY_TCP_DST,
 			     spec->hdr.dst_port);
-	if (spec->hdr.src_port & mask->hdr.src_port)
+	if (mask->hdr.src_port)
 		tap_nlattr_add16(&msg->nh, TCA_FLOWER_KEY_TCP_SRC,
 			     spec->hdr.src_port);
 	return 0;
-- 
2.17.1