netdev - [PATCH iproute2/master 10/11] f_bpf: communicate ifindex for eBPF offload

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Message-Id: <20171124021208.13419-11-jakub.kicinski@netronome.com>
Date:   Thu, 23 Nov 2017 18:12:07 -0800
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     netdev@...r.kernel.org
Cc:     oss-drivers@...ronome.com, daniel@...earbox.net,
        Jakub Kicinski <jakub.kicinski@...ronome.com>
Subject: [PATCH iproute2/master 10/11] f_bpf: communicate ifindex for eBPF offload

Split parsing and loading of the eBPF program and if skip_sw is set
load the program for ifindex, to which the qdisc is attached.

Note that the ifindex will be ignored for programs which are already
loaded (e.g. when using pinned programs), but in that case we just
trust the user knows what he's doing.  Hopefully we will get extack
soon in the driver to help debugging this case.

Signed-off-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
Reviewed-by: Quentin Monnet <quentin.monnet@...ronome.com>
Acked-by: Daniel Borkmann <daniel@...earbox.net>
---
 tc/f_bpf.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/tc/f_bpf.c b/tc/f_bpf.c
index f598784e8b08..5906f8bb969d 100644
--- a/tc/f_bpf.c
+++ b/tc/f_bpf.c
@@ -82,6 +82,7 @@ static int bpf_parse_opt(struct filter_util *qu, char *handle,
 	unsigned int bpf_flags = 0;
 	struct bpf_cfg_in cfg = {};
 	bool seen_run = false;
+	bool skip_sw = false;
 	struct rtattr *tail;
 	int ret = 0;
 
@@ -110,8 +111,11 @@ static int bpf_parse_opt(struct filter_util *qu, char *handle,
 			cfg.argc = argc;
 			cfg.argv = argv;
 
-			if (bpf_parse_and_load_common(&cfg, &bpf_cb_ops, n))
+			if (bpf_parse_common(&cfg, &bpf_cb_ops) < 0) {
+				fprintf(stderr,
+					"Unable to parse bpf command line\n");
 				return -1;
+			}
 
 			argc = cfg.argc;
 			argv = cfg.argv;
@@ -135,6 +139,7 @@ static int bpf_parse_opt(struct filter_util *qu, char *handle,
 			bpf_gen_flags |= TCA_CLS_FLAGS_SKIP_HW;
 		} else if (matches(*argv, "skip_sw") == 0) {
 			bpf_gen_flags |= TCA_CLS_FLAGS_SKIP_SW;
+			skip_sw = true;
 		} else if (matches(*argv, "action") == 0) {
 			NEXT_ARG();
 			if (parse_action(&argc, &argv, TCA_BPF_ACT, n)) {
@@ -164,6 +169,13 @@ static int bpf_parse_opt(struct filter_util *qu, char *handle,
 		NEXT_ARG_FWD();
 	}
 
+	if (skip_sw)
+		cfg.ifindex = t->tcm_ifindex;
+	if (bpf_load_common(&cfg, &bpf_cb_ops, n) < 0) {
+		fprintf(stderr, "Unable to load program\n");
+		return -1;
+	}
+
 	if (bpf_gen_flags)
 		addattr32(n, MAX_MSG, TCA_BPF_FLAGS_GEN, bpf_gen_flags);
 	if (bpf_flags)
-- 
2.14.1