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Date: Wed, 10 Jan 2018 09:42:01 -0200
From: Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
To: Chris Mi <chrism@...lanox.com>
Cc: netdev@...r.kernel.org, gerlitz.or@...il.com,
stephen@...workplumber.org, dsahern@...il.com, phil@....cc
Subject: Re: [patch iproute2 v8 2/2] tc: Add batchsize feature for filter and
actions
On Wed, Jan 10, 2018 at 12:27:42PM +0900, Chris Mi wrote:
> 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:
> filter and actions add/delete/change/replace.
>
> Signed-off-by: Chris Mi <chrism@...lanox.com>
> ---
> tc/m_action.c | 60 +++++++++++++--------
> tc/tc.c | 165 ++++++++++++++++++++++++++++++++++++++++++++++++++++-----
> tc/tc_common.h | 5 +-
> tc/tc_filter.c | 97 +++++++++++++++++++--------------
> 4 files changed, 249 insertions(+), 78 deletions(-)
>
> diff --git a/tc/m_action.c b/tc/m_action.c
> index fc422364..e5c53a80 100644
> --- a/tc/m_action.c
> +++ b/tc/m_action.c
> @@ -546,40 +546,56 @@ 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)
> {
> - 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;
> + else
> + 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 (rtnl_talk(&rth, &req.n, NULL) < 0) {
> + iov.iov_base = &req->n;
> + iov.iov_len = req->n.nlmsg_len;
> +
> + if (buf)
> + return 0;
> +
> + 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 +695,7 @@ bad_val:
> return ret;
> }
>
> -int do_action(int argc, char **argv)
> +int do_action(int argc, char **argv, void *buf)
> {
>
> int ret = 0;
> @@ -689,12 +705,12 @@ 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);
> } 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);
> } else if (matches(*argv, "delete") == 0) {
> argc -= 1;
> argv += 1;
> diff --git a/tc/tc.c b/tc/tc.c
> index ad9f07e9..44277405 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)
> {
> 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);
> if (matches(*argv, "actions") == 0)
> - return do_action(argc-1, argv+1);
> + return do_action(argc-1, argv+1, buf);
> if (matches(*argv, "monitor") == 0)
> return do_tcmonitor(argc-1, argv+1);
> if (matches(*argv, "exec") == 0)
> @@ -217,11 +217,79 @@ static int do_cmd(int argc, char **argv)
> return -1;
> }
>
> +static bool batchsize_enabled(int argc, char *argv[])
> +{
> + if (argc < 2)
> + return false;
> + if ((matches(argv[0], "filter") && matches(argv[0], "actions"))
> + || (matches(argv[1], "add") && matches(argv[1], "delete")
> + && matches(argv[1], "change") && matches(argv[1], "replace")))
> + return false;
> + return true;
> +}
> +
> +struct batch_buf {
> + struct batch_buf *next;
> + char buf[16420]; /* sizeof (struct nlmsghdr) +
> + sizeof (struct tcmsg) +
> + MAX_MSG */
> +};
> +
> +static struct batch_buf *get_batch_buf(struct batch_buf **pool)
> +{
> + 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));
> + }
> + 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 +308,94 @@ 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);
> + if (!buf) {
> + fprintf(stderr, "failed to allocate batch_buf\n");
> + return -1;
> + }
> + if (head == NULL)
> + head = tail = buf;
> + else {
> + tail->next = buf;
> + tail = buf;
> + }
What about moving this list handling to get_batch_buf(), like you did
for put_batch_buf() ? Just for the sake of consistency.
Otherwise LGTM!
Marcelo
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