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Date: Thu, 11 Jan 2018 05:32:02 +0000
From: Chris Mi <chrism@...lanox.com>
To: Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
CC: "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"gerlitz.or@...il.com" <gerlitz.or@...il.com>,
"stephen@...workplumber.org" <stephen@...workplumber.org>,
"dsahern@...il.com" <dsahern@...il.com>,
"phil@....cc" <phil@....cc>
Subject: RE: [patch iproute2 v8 2/2] tc: Add batchsize feature for filter and
actions
> -----Original Message-----
> From: Marcelo Ricardo Leitner [mailto:marcelo.leitner@...il.com]
> Sent: Wednesday, January 10, 2018 7:42 PM
> 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.
Done.
>
> Otherwise LGTM!
>
> Marcelo
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