Message-Id: <20180111054408.26890-3-chrism@mellanox.com>
Date:   Thu, 11 Jan 2018 14:44:08 +0900
From:   Chris Mi <chrism@...lanox.com>
To:     netdev@...r.kernel.org
Cc:     gerlitz.or@...il.com, stephen@...workplumber.org,
        dsahern@...il.com, marcelo.leitner@...il.com, phil@....cc
Subject: [patch iproute2 v9 2/2] tc: Add batchsize feature for filter and actions

Currently in tc batch mode, only one command is read from the batch
file and sent to kernel to process. With this support, at most 128
commands can be accumulated before sending to kernel.

Now it only works for the following successive commands:
1. filter add/delete/change/replace
2. actions add/change/replace

Signed-off-by: Chris Mi <chrism@...lanox.com>
---
 tc/m_action.c  |  65 ++++++++++++------
 tc/tc.c        | 208 ++++++++++++++++++++++++++++++++++++++++++++++++++++-----
 tc/tc_common.h |   5 +-
 tc/tc_filter.c | 104 ++++++++++++++++++-----------
 4 files changed, 303 insertions(+), 79 deletions(-)

diff --git a/tc/m_action.c b/tc/m_action.c
index fc422364..611f6cc2 100644
--- a/tc/m_action.c
+++ b/tc/m_action.c
@@ -546,40 +546,61 @@ bad_val:
 	return ret;
 }
 
+struct tc_action_req {
+	struct nlmsghdr		n;
+	struct tcamsg		t;
+	char			buf[MAX_MSG];
+};
+
 static int tc_action_modify(int cmd, unsigned int flags,
-			    int *argc_p, char ***argv_p)
+			    int *argc_p, char ***argv_p,
+			    void *buf, size_t buflen)
 {
-	int argc = *argc_p;
+	struct tc_action_req *req, action_req;
 	char **argv = *argv_p;
+	struct rtattr *tail;
+	int argc = *argc_p;
+	struct iovec iov;
 	int ret = 0;
-	struct {
-		struct nlmsghdr         n;
-		struct tcamsg           t;
-		char                    buf[MAX_MSG];
-	} req = {
-		.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcamsg)),
-		.n.nlmsg_flags = NLM_F_REQUEST | flags,
-		.n.nlmsg_type = cmd,
-		.t.tca_family = AF_UNSPEC,
-	};
-	struct rtattr *tail = NLMSG_TAIL(&req.n);
+
+	if (buf) {
+		req = buf;
+		if (buflen < sizeof (struct tc_action_req)) {
+			fprintf(stderr, "buffer is too small: %zu\n", buflen);
+			return -1;
+		}
+	} else {
+		memset(&action_req, 0, sizeof (struct tc_action_req));
+		req = &action_req;
+	}
+
+	req->n.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcamsg));
+	req->n.nlmsg_flags = NLM_F_REQUEST | flags;
+	req->n.nlmsg_type = cmd;
+	req->t.tca_family = AF_UNSPEC;
+	tail = NLMSG_TAIL(&req->n);
 
 	argc -= 1;
 	argv += 1;
-	if (parse_action(&argc, &argv, TCA_ACT_TAB, &req.n)) {
+	if (parse_action(&argc, &argv, TCA_ACT_TAB, &req->n)) {
 		fprintf(stderr, "Illegal \"action\"\n");
 		return -1;
 	}
-	tail->rta_len = (void *) NLMSG_TAIL(&req.n) - (void *) tail;
+	tail->rta_len = (void *) NLMSG_TAIL(&req->n) - (void *) tail;
+
+	*argc_p = argc;
+	*argv_p = argv;
+
+	if (buf)
+		return 0;
 
-	if (rtnl_talk(&rth, &req.n, NULL) < 0) {
+	iov.iov_base = &req->n;
+	iov.iov_len = req->n.nlmsg_len;
+	if (rtnl_talk_iov(&rth, &iov, 1, NULL) < 0) {
 		fprintf(stderr, "We have an error talking to the kernel\n");
 		ret = -1;
 	}
 
-	*argc_p = argc;
-	*argv_p = argv;
-
 	return ret;
 }
 
@@ -679,7 +700,7 @@ bad_val:
 	return ret;
 }
 
-int do_action(int argc, char **argv)
+int do_action(int argc, char **argv, void *buf, size_t buflen)
 {
 
 	int ret = 0;
@@ -689,12 +710,12 @@ int do_action(int argc, char **argv)
 		if (matches(*argv, "add") == 0) {
 			ret =  tc_action_modify(RTM_NEWACTION,
 						NLM_F_EXCL | NLM_F_CREATE,
-						&argc, &argv);
+						&argc, &argv, buf, buflen);
 		} else if (matches(*argv, "change") == 0 ||
 			  matches(*argv, "replace") == 0) {
 			ret = tc_action_modify(RTM_NEWACTION,
 					       NLM_F_CREATE | NLM_F_REPLACE,
-					       &argc, &argv);
+					       &argc, &argv, buf, buflen);
 		} else if (matches(*argv, "delete") == 0) {
 			argc -= 1;
 			argv += 1;
diff --git a/tc/tc.c b/tc/tc.c
index ad9f07e9..8ffea11c 100644
--- a/tc/tc.c
+++ b/tc/tc.c
@@ -193,16 +193,16 @@ static void usage(void)
 			"                    -nm | -nam[es] | { -cf | -conf } path } | -j[son]\n");
 }
 
-static int do_cmd(int argc, char **argv)
+static int do_cmd(int argc, char **argv, void *buf, size_t buflen)
 {
 	if (matches(*argv, "qdisc") == 0)
 		return do_qdisc(argc-1, argv+1);
 	if (matches(*argv, "class") == 0)
 		return do_class(argc-1, argv+1);
 	if (matches(*argv, "filter") == 0)
-		return do_filter(argc-1, argv+1);
+		return do_filter(argc-1, argv+1, buf, buflen);
 	if (matches(*argv, "actions") == 0)
-		return do_action(argc-1, argv+1);
+		return do_action(argc-1, argv+1, buf, buflen);
 	if (matches(*argv, "monitor") == 0)
 		return do_tcmonitor(argc-1, argv+1);
 	if (matches(*argv, "exec") == 0)
@@ -217,11 +217,119 @@ static int do_cmd(int argc, char **argv)
 	return -1;
 }
 
+struct batchsize_command
+{
+	char *command;
+	int subclen;
+	char *subcommands[10];
+};
+
+struct batchsize_command bc_table[2] =
+{{
+	"filter",
+	4,
+	{"add", "delete", "change", "replace"}
+}, {
+	"actions",
+	3,
+	{"add", "change", "replace"}
+}};
+
+static bool batchsize_enabled(int argc, char *argv[])
+{
+	struct batchsize_command *bc = bc_table;
+	int i, j, n;
+
+	if (argc < 2)
+		return false;
+
+	n = sizeof (bc_table) / sizeof (struct batchsize_command);
+	for (i = 0; i < n; i++, ++bc) {
+		if (matches(argv[0], bc->command))
+			continue;
+		for (j = 0; j < bc->subclen; j++) {
+			if (matches(argv[1], bc->subcommands[j]) == 0)
+				return true;
+		}
+	}
+
+	return false;
+}
+
+struct batch_buf {
+	struct batch_buf	*next;
+	char			buf[16420];	/* sizeof (struct nlmsghdr) +
+						   max(sizeof (struct tcmsg) +
+						   sizeof (struct tcamsg)) +
+						   MAX_MSG */
+};
+
+static struct batch_buf *get_batch_buf(struct batch_buf **pool,
+				       struct batch_buf **head,
+				       struct batch_buf **tail)
+{
+	struct batch_buf *buf;
+
+	if (*pool == NULL)
+		buf = calloc(1, sizeof (struct batch_buf));
+	else {
+		buf = *pool;
+		*pool = (*pool)->next;
+		memset(buf, 0, sizeof (struct batch_buf));
+	}
+
+	if (*head == NULL)
+		*head = *tail = buf;
+	else {
+		(*tail)->next = buf;
+		(*tail) = buf;
+	}
+
+	return buf;
+}
+
+static void put_batch_bufs(struct batch_buf **pool,
+			   struct batch_buf **head,
+			   struct batch_buf **tail)
+{
+	if (*head == NULL || *tail == NULL)
+		return;
+
+	if (*pool == NULL)
+		*pool = *head;
+	else {
+		(*tail)->next = *pool;
+		*pool = *head;
+	}
+	*head = NULL;
+	*tail = NULL;
+}
+
+static void free_batch_bufs(struct batch_buf **pool)
+{
+	struct batch_buf *buf;
+
+	for (buf = *pool; buf != NULL; buf = *pool) {
+		*pool = buf->next;
+		free(buf);
+	}
+	*pool = NULL;
+}
+
 static int batch(const char *name)
 {
-	char *line = NULL;
+	struct batch_buf *head = NULL, *tail = NULL, *buf_pool = NULL;
+	char *largv[100], *largv_next[100];
+	char *line, *line_next = NULL;
+	bool bs_enabled_next = false;
+	bool bs_enabled = false;
+	bool lastline = false;
+	int largc, largc_next;
+	bool bs_enabled_saved;
+	int batchsize = 0;
 	size_t len = 0;
 	int ret = 0;
+	bool send;
 
 	batch_mode = 1;
 	if (name && strcmp(name, "-") != 0) {
@@ -240,25 +348,95 @@ static int batch(const char *name)
 	}
 
 	cmdlineno = 0;
-	while (getcmdline(&line, &len, stdin) != -1) {
-		char *largv[100];
-		int largc;
+	if (getcmdline(&line, &len, stdin) == -1)
+		goto Exit;
+	largc = makeargs(line, largv, 100);
+	bs_enabled = batchsize_enabled(largc, largv);
+	bs_enabled_saved = bs_enabled;
+	do {
+		if (getcmdline(&line_next, &len, stdin) == -1)
+			lastline = true;
+
+		largc_next = makeargs(line_next, largv_next, 100);
+		bs_enabled_next = batchsize_enabled(largc_next, largv_next);
+		if (bs_enabled) {
+			struct batch_buf *buf;
+
+			buf = get_batch_buf(&buf_pool, &head, &tail);
+			if (!buf) {
+				fprintf(stderr,
+					"failed to allocate batch_buf\n");
+				return -1;
+			}
+			++batchsize;
+		}
 
-		largc = makeargs(line, largv, 100);
-		if (largc == 0)
+		/*
+		 * In batch mode, if we haven't accumulated enough commands
+		 * and this is not the last command and this command & next
+		 * command both support the batchsize feature, don't send the
+		 * message immediately.
+		 */
+		if (!lastline && bs_enabled && bs_enabled_next
+		    && batchsize != MSG_IOV_MAX)
+			send = false;
+		else
+			send = true;
+
+		line = line_next;
+		line_next = NULL;
+		len = 0;
+		bs_enabled_saved = bs_enabled;
+		bs_enabled = bs_enabled_next;
+		bs_enabled_next = false;
+
+		if (largc == 0) {
+			largc = largc_next;
+			memcpy(largv, largv_next, largc * sizeof(char *));
 			continue;	/* blank line */
+		}
 
-		if (do_cmd(largc, largv)) {
-			fprintf(stderr, "Command failed %s:%d\n", name, cmdlineno);
+		ret = do_cmd(largc, largv, tail == NULL ? NULL : tail->buf,
+			     tail == NULL ? 0 : sizeof (tail->buf));
+		if (ret != 0) {
+			fprintf(stderr, "Command failed %s:%d\n", name,
+				cmdlineno - 1);
 			ret = 1;
 			if (!force)
 				break;
 		}
-	}
-	if (line)
-		free(line);
+		largc = largc_next;
+		memcpy(largv, largv_next, largc * sizeof(char *));
+
+		if (send && bs_enabled_saved) {
+			struct iovec *iov, *iovs;
+			struct batch_buf *buf;
+			struct nlmsghdr *n;
+
+			iov = iovs = malloc(batchsize * sizeof (struct iovec));
+			for (buf = head; buf != NULL; buf = buf->next, ++iov) {
+				n = (struct nlmsghdr *)&buf->buf;
+				iov->iov_base = n;
+				iov->iov_len = n->nlmsg_len;
+			}
+
+			ret = rtnl_talk_iov(&rth, iovs, batchsize, NULL);
+			if (ret < 0) {
+				fprintf(stderr, "Command failed %s:%d\n", name,
+					cmdlineno - (batchsize + ret) - 1);
+				return 2;
+			}
+			put_batch_bufs(&buf_pool, &head, &tail);
+			batchsize = 0;
+			free(iovs);
+		}
+	} while (!lastline);
 
+	free_batch_bufs(&buf_pool);
+Exit:
+	free(line);
 	rtnl_close(&rth);
+
 	return ret;
 }
 
@@ -341,7 +519,7 @@ int main(int argc, char **argv)
 		goto Exit;
 	}
 
-	ret = do_cmd(argc-1, argv+1);
+	ret = do_cmd(argc-1, argv+1, NULL, 0);
 Exit:
 	rtnl_close(&rth);
 
diff --git a/tc/tc_common.h b/tc/tc_common.h
index 264fbdac..49c24616 100644
--- a/tc/tc_common.h
+++ b/tc/tc_common.h
@@ -1,13 +1,14 @@
 /* SPDX-License-Identifier: GPL-2.0 */
 
 #define TCA_BUF_MAX	(64*1024)
+#define MSG_IOV_MAX	128
 
 extern struct rtnl_handle rth;
 
 extern int do_qdisc(int argc, char **argv);
 extern int do_class(int argc, char **argv);
-extern int do_filter(int argc, char **argv);
-extern int do_action(int argc, char **argv);
+extern int do_filter(int argc, char **argv, void *buf, size_t buflen);
+extern int do_action(int argc, char **argv, void *buf, size_t buflen);
 extern int do_tcmonitor(int argc, char **argv);
 extern int do_exec(int argc, char **argv);
 
diff --git a/tc/tc_filter.c b/tc/tc_filter.c
index 545cc3a1..7dd123ab 100644
--- a/tc/tc_filter.c
+++ b/tc/tc_filter.c
@@ -42,28 +42,44 @@ static void usage(void)
 		"OPTIONS := ... try tc filter add <desired FILTER_KIND> help\n");
 }
 
-static int tc_filter_modify(int cmd, unsigned int flags, int argc, char **argv)
+struct tc_filter_req {
+	struct nlmsghdr		n;
+	struct tcmsg		t;
+	char			buf[MAX_MSG];
+};
+
+static int tc_filter_modify(int cmd, unsigned int flags, int argc, char **argv,
+			    void *buf, size_t buflen)
 {
-	struct {
-		struct nlmsghdr	n;
-		struct tcmsg		t;
-		char			buf[MAX_MSG];
-	} req = {
-		.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcmsg)),
-		.n.nlmsg_flags = NLM_F_REQUEST | flags,
-		.n.nlmsg_type = cmd,
-		.t.tcm_family = AF_UNSPEC,
-	};
+	struct tc_filter_req *req, filter_req;
 	struct filter_util *q = NULL;
-	__u32 prio = 0;
-	__u32 protocol = 0;
-	int protocol_set = 0;
-	__u32 chain_index;
+	struct tc_estimator est = {};
+	char k[FILTER_NAMESZ] = {};
 	int chain_index_set = 0;
+	char d[IFNAMSIZ] = {};
+	int protocol_set = 0;
 	char *fhandle = NULL;
-	char  d[IFNAMSIZ] = {};
-	char  k[FILTER_NAMESZ] = {};
-	struct tc_estimator est = {};
+	__u32 protocol = 0;
+	__u32 chain_index;
+	struct iovec iov;
+	__u32 prio = 0;
+	int ret;
+
+	if (buf) {
+		req = buf;
+		if (buflen < sizeof (struct tc_filter_req)) {
+			fprintf(stderr, "buffer is too small: %zu\n", buflen);
+			return -1;
+		}
+	} else {
+		memset(&filter_req, 0, sizeof (struct tc_filter_req));
+		req = &filter_req;
+	}
+
+	req->n.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcmsg));
+	req->n.nlmsg_flags = NLM_F_REQUEST | flags;
+	req->n.nlmsg_type = cmd;
+	req->t.tcm_family = AF_UNSPEC;
 
 	if (cmd == RTM_NEWTFILTER && flags & NLM_F_CREATE)
 		protocol = htons(ETH_P_ALL);
@@ -75,37 +91,37 @@ static int tc_filter_modify(int cmd, unsigned int flags, int argc, char **argv)
 				duparg("dev", *argv);
 			strncpy(d, *argv, sizeof(d)-1);
 		} else if (strcmp(*argv, "root") == 0) {
-			if (req.t.tcm_parent) {
+			if (req->t.tcm_parent) {
 				fprintf(stderr,
 					"Error: \"root\" is duplicate parent ID\n");
 				return -1;
 			}
-			req.t.tcm_parent = TC_H_ROOT;
+			req->t.tcm_parent = TC_H_ROOT;
 		} else if (strcmp(*argv, "ingress") == 0) {
-			if (req.t.tcm_parent) {
+			if (req->t.tcm_parent) {
 				fprintf(stderr,
 					"Error: \"ingress\" is duplicate parent ID\n");
 				return -1;
 			}
-			req.t.tcm_parent = TC_H_MAKE(TC_H_CLSACT,
+			req->t.tcm_parent = TC_H_MAKE(TC_H_CLSACT,
 						     TC_H_MIN_INGRESS);
 		} else if (strcmp(*argv, "egress") == 0) {
-			if (req.t.tcm_parent) {
+			if (req->t.tcm_parent) {
 				fprintf(stderr,
 					"Error: \"egress\" is duplicate parent ID\n");
 				return -1;
 			}
-			req.t.tcm_parent = TC_H_MAKE(TC_H_CLSACT,
+			req->t.tcm_parent = TC_H_MAKE(TC_H_CLSACT,
 						     TC_H_MIN_EGRESS);
 		} else if (strcmp(*argv, "parent") == 0) {
 			__u32 handle;
 
 			NEXT_ARG();
-			if (req.t.tcm_parent)
+			if (req->t.tcm_parent)
 				duparg("parent", *argv);
 			if (get_tc_classid(&handle, *argv))
 				invarg("Invalid parent ID", *argv);
-			req.t.tcm_parent = handle;
+			req->t.tcm_parent = handle;
 		} else if (strcmp(*argv, "handle") == 0) {
 			NEXT_ARG();
 			if (fhandle)
@@ -152,26 +168,26 @@ static int tc_filter_modify(int cmd, unsigned int flags, int argc, char **argv)
 		argc--; argv++;
 	}
 
-	req.t.tcm_info = TC_H_MAKE(prio<<16, protocol);
+	req->t.tcm_info = TC_H_MAKE(prio<<16, protocol);
 
 	if (chain_index_set)
-		addattr32(&req.n, sizeof(req), TCA_CHAIN, chain_index);
+		addattr32(&req->n, sizeof(*req), TCA_CHAIN, chain_index);
 
 	if (k[0])
-		addattr_l(&req.n, sizeof(req), TCA_KIND, k, strlen(k)+1);
+		addattr_l(&req->n, sizeof(*req), TCA_KIND, k, strlen(k)+1);
 
 	if (d[0])  {
 		ll_init_map(&rth);
 
-		req.t.tcm_ifindex = ll_name_to_index(d);
-		if (req.t.tcm_ifindex == 0) {
+		req->t.tcm_ifindex = ll_name_to_index(d);
+		if (req->t.tcm_ifindex == 0) {
 			fprintf(stderr, "Cannot find device \"%s\"\n", d);
 			return 1;
 		}
 	}
 
 	if (q) {
-		if (q->parse_fopt(q, fhandle, argc, argv, &req.n))
+		if (q->parse_fopt(q, fhandle, argc, argv, &req->n))
 			return 1;
 	} else {
 		if (fhandle) {
@@ -190,10 +206,16 @@ static int tc_filter_modify(int cmd, unsigned int flags, int argc, char **argv)
 	}
 
 	if (est.ewma_log)
-		addattr_l(&req.n, sizeof(req), TCA_RATE, &est, sizeof(est));
+		addattr_l(&req->n, sizeof(*req), TCA_RATE, &est, sizeof(est));
 
-	if (rtnl_talk(&rth, &req.n, NULL) < 0) {
-		fprintf(stderr, "We have an error talking to the kernel\n");
+	if (buf)
+		return 0;
+
+	iov.iov_base = &req->n;
+	iov.iov_len = req->n.nlmsg_len;
+	ret = rtnl_talk_iov(&rth, &iov, 1, NULL);
+	if (ret < 0) {
+		fprintf(stderr, "We have an error talking to the kernel, %d\n", ret);
 		return 2;
 	}
 
@@ -636,20 +658,22 @@ static int tc_filter_list(int argc, char **argv)
 	return 0;
 }
 
-int do_filter(int argc, char **argv)
+int do_filter(int argc, char **argv, void *buf, size_t buflen)
 {
 	if (argc < 1)
 		return tc_filter_list(0, NULL);
 	if (matches(*argv, "add") == 0)
 		return tc_filter_modify(RTM_NEWTFILTER, NLM_F_EXCL|NLM_F_CREATE,
-					argc-1, argv+1);
+					argc-1, argv+1, buf, buflen);
 	if (matches(*argv, "change") == 0)
-		return tc_filter_modify(RTM_NEWTFILTER, 0, argc-1, argv+1);
+		return tc_filter_modify(RTM_NEWTFILTER, 0, argc-1, argv+1,
+					buf, buflen);
 	if (matches(*argv, "replace") == 0)
 		return tc_filter_modify(RTM_NEWTFILTER, NLM_F_CREATE, argc-1,
-					argv+1);
+					argv+1, buf, buflen);
 	if (matches(*argv, "delete") == 0)
-		return tc_filter_modify(RTM_DELTFILTER, 0,  argc-1, argv+1);
+		return tc_filter_modify(RTM_DELTFILTER, 0, argc-1, argv+1,
+					buf, buflen);
 	if (matches(*argv, "get") == 0)
 		return tc_filter_get(RTM_GETTFILTER, 0,  argc-1, argv+1);
 	if (matches(*argv, "list") == 0 || matches(*argv, "show") == 0
-- 
2.14.2

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