netdev - [PATCH iproute2] tc: Fix block-handle support for filter operations

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Message-Id: <20190812101706.15778-1-idosch@idosch.org>
Date:   Mon, 12 Aug 2019 13:17:06 +0300
From:   Ido Schimmel <idosch@...sch.org>
To:     netdev@...r.kernel.org
Cc:     stephen@...workplumber.org, dsahern@...il.com, jiri@...lanox.com,
        mlxsw@...lanox.com, Ido Schimmel <idosch@...lanox.com>
Subject: [PATCH iproute2] tc: Fix block-handle support for filter operations

From: Ido Schimmel <idosch@...lanox.com>

Commit e991c04d64c0 ("Revert "tc: Add batchsize feature for filter and
actions"") reverted more than it should and broke shared block
functionality. Fix this by restoring the original functionality.

To reproduce:

# tc qdisc add dev swp1 ingress_block 10 ingress
# tc filter add block 10 proto ip pref 1 flower \
	dst_ip 192.0.2.0/24 action drop
Unknown filter "block", hence option "10" is unparsable

Fixes: e991c04d64c0 ("Revert "tc: Add batchsize feature for filter and actions"")
Signed-off-by: Ido Schimmel <idosch@...lanox.com>
---
 tc/tc_filter.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/tc/tc_filter.c b/tc/tc_filter.c
index 53759a7a8876..23e21d89d7d1 100644
--- a/tc/tc_filter.c
+++ b/tc/tc_filter.c
@@ -74,6 +74,7 @@ static int tc_filter_modify(int cmd, unsigned int flags, int argc, char **argv)
 	__u32 prio = 0;
 	__u32 protocol = 0;
 	int protocol_set = 0;
+	__u32 block_index = 0;
 	__u32 chain_index;
 	int chain_index_set = 0;
 	char *fhandle = NULL;
@@ -89,7 +90,21 @@ static int tc_filter_modify(int cmd, unsigned int flags, int argc, char **argv)
 			NEXT_ARG();
 			if (d[0])
 				duparg("dev", *argv);
+			if (block_index) {
+				fprintf(stderr, "Error: \"dev\" and \"block\" are mutually exclusive\n");
+				return -1;
+			}
 			strncpy(d, *argv, sizeof(d)-1);
+		} else if (matches(*argv, "block") == 0) {
+			NEXT_ARG();
+			if (block_index)
+				duparg("block", *argv);
+			if (d[0]) {
+				fprintf(stderr, "Error: \"dev\" and \"block\" are mutually exclusive\n");
+				return -1;
+			}
+			if (get_u32(&block_index, *argv, 0) || !block_index)
+				invarg("invalid block index value", *argv);
 		} else if (strcmp(*argv, "root") == 0) {
 			if (req.t.tcm_parent) {
 				fprintf(stderr,
@@ -184,6 +199,9 @@ static int tc_filter_modify(int cmd, unsigned int flags, int argc, char **argv)
 			fprintf(stderr, "Cannot find device \"%s\"\n", d);
 			return 1;
 		}
+	} else if (block_index) {
+		req.t.tcm_ifindex = TCM_IFINDEX_MAGIC_BLOCK;
+		req.t.tcm_block_index = block_index;
 	}
 
 	if (q) {
-- 
2.21.0