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Date: Fri, 24 May 2019 10:51:11 +0800
From: Ye Xiaolong <xiaolong.ye@...el.com>
To: Magnus Karlsson <magnus.karlsson@...el.com>
Cc: bjorn.topel@...el.com, ast@...nel.org, daniel@...earbox.net,
netdev@...r.kernel.org, brouer@...hat.com, bpf@...r.kernel.org,
bruce.richardson@...el.com, ciara.loftus@...el.com,
jakub.kicinski@...ronome.com, qi.z.zhang@...el.com,
maximmi@...lanox.com, sridhar.samudrala@...el.com,
kevin.laatz@...el.com
Subject: Re: [RFC bpf-next 7/7] samples/bpf: add busy-poll support to xdpsock
sample
Hi, Magnus
On 05/02, Magnus Karlsson wrote:
>This patch adds busy-poll support to the xdpsock sample
>application. It is enabled by the "-b" or the "--busy-poll" command
>line options.
>
>Signed-off-by: Magnus Karlsson <magnus.karlsson@...el.com>
>---
> samples/bpf/xdpsock_user.c | 203 ++++++++++++++++++++++++++++-----------------
> 1 file changed, 125 insertions(+), 78 deletions(-)
>
>diff --git a/samples/bpf/xdpsock_user.c b/samples/bpf/xdpsock_user.c
>index d08ee1a..1272edf 100644
>--- a/samples/bpf/xdpsock_user.c
>+++ b/samples/bpf/xdpsock_user.c
>@@ -66,6 +66,7 @@ static const char *opt_if = "";
> static int opt_ifindex;
> static int opt_queue;
> static int opt_poll;
>+static int opt_busy_poll;
> static int opt_interval = 1;
> static u32 opt_xdp_bind_flags;
> static __u32 prog_id;
>@@ -119,8 +120,11 @@ static void print_benchmark(bool running)
> else
> printf(" ");
>
>- if (opt_poll)
>+ if (opt_poll) {
>+ if (opt_busy_poll)
>+ printf("busy-");
> printf("poll() ");
>+ }
>
> if (running) {
> printf("running...");
>@@ -306,7 +310,7 @@ static struct xsk_socket_info *xsk_configure_socket(struct xsk_umem_info *umem)
> xsk->umem = umem;
> cfg.rx_size = XSK_RING_CONS__DEFAULT_NUM_DESCS;
> cfg.tx_size = XSK_RING_PROD__DEFAULT_NUM_DESCS;
>- cfg.libbpf_flags = 0;
Any purpose for removing this line, as cfg here is a local variable, cfg.libbpf_flags
can be random and may lead to xdpsock failure as `Invalid no_argument`.
Thanks,
Xiaolong
>+ cfg.busy_poll = (opt_busy_poll ? BATCH_SIZE : 0);
> cfg.xdp_flags = opt_xdp_flags;
> cfg.bind_flags = opt_xdp_bind_flags;
> ret = xsk_socket__create(&xsk->xsk, opt_if, opt_queue, umem->umem,
>@@ -319,17 +323,17 @@ static struct xsk_socket_info *xsk_configure_socket(struct xsk_umem_info *umem)
> exit_with_error(-ret);
>
> ret = xsk_ring_prod__reserve(&xsk->umem->fq,
>- XSK_RING_PROD__DEFAULT_NUM_DESCS,
>+ 1024,
> &idx);
>- if (ret != XSK_RING_PROD__DEFAULT_NUM_DESCS)
>+ if (ret != 1024)
> exit_with_error(-ret);
> for (i = 0;
>- i < XSK_RING_PROD__DEFAULT_NUM_DESCS *
>+ i < 1024 *
> XSK_UMEM__DEFAULT_FRAME_SIZE;
> i += XSK_UMEM__DEFAULT_FRAME_SIZE)
> *xsk_ring_prod__fill_addr(&xsk->umem->fq, idx++) = i;
> xsk_ring_prod__submit(&xsk->umem->fq,
>- XSK_RING_PROD__DEFAULT_NUM_DESCS);
>+ 1024);
>
> return xsk;
> }
>@@ -341,6 +345,7 @@ static struct option long_options[] = {
> {"interface", required_argument, 0, 'i'},
> {"queue", required_argument, 0, 'q'},
> {"poll", no_argument, 0, 'p'},
>+ {"busy-poll", no_argument, 0, 'b'},
> {"xdp-skb", no_argument, 0, 'S'},
> {"xdp-native", no_argument, 0, 'N'},
> {"interval", required_argument, 0, 'n'},
>@@ -360,6 +365,7 @@ static void usage(const char *prog)
> " -i, --interface=n Run on interface n\n"
> " -q, --queue=n Use queue n (default 0)\n"
> " -p, --poll Use poll syscall\n"
>+ " -b, --busy-poll Use poll syscall with busy poll\n"
> " -S, --xdp-skb=n Use XDP skb-mod\n"
> " -N, --xdp-native=n Enfore XDP native mode\n"
> " -n, --interval=n Specify statistics update interval (default 1 sec).\n"
>@@ -377,7 +383,7 @@ static void parse_command_line(int argc, char **argv)
> opterr = 0;
>
> for (;;) {
>- c = getopt_long(argc, argv, "Frtli:q:psSNn:cz", long_options,
>+ c = getopt_long(argc, argv, "Frtli:q:pbsSNn:cz", long_options,
> &option_index);
> if (c == -1)
> break;
>@@ -401,6 +407,10 @@ static void parse_command_line(int argc, char **argv)
> case 'p':
> opt_poll = 1;
> break;
>+ case 'b':
>+ opt_busy_poll = 1;
>+ opt_poll = 1;
>+ break;
> case 'S':
> opt_xdp_flags |= XDP_FLAGS_SKB_MODE;
> opt_xdp_bind_flags |= XDP_COPY;
>@@ -444,7 +454,8 @@ static void kick_tx(struct xsk_socket_info *xsk)
> exit_with_error(errno);
> }
>
>-static inline void complete_tx_l2fwd(struct xsk_socket_info *xsk)
>+static inline void complete_tx_l2fwd(struct xsk_socket_info *xsk,
>+ struct pollfd *fds)
> {
> u32 idx_cq = 0, idx_fq = 0;
> unsigned int rcvd;
>@@ -453,7 +464,8 @@ static inline void complete_tx_l2fwd(struct xsk_socket_info *xsk)
> if (!xsk->outstanding_tx)
> return;
>
>- kick_tx(xsk);
>+ if (!opt_poll)
>+ kick_tx(xsk);
> ndescs = (xsk->outstanding_tx > BATCH_SIZE) ? BATCH_SIZE :
> xsk->outstanding_tx;
>
>@@ -467,6 +479,8 @@ static inline void complete_tx_l2fwd(struct xsk_socket_info *xsk)
> while (ret != rcvd) {
> if (ret < 0)
> exit_with_error(-ret);
>+ if (opt_busy_poll)
>+ ret = poll(fds, num_socks, 0);
> ret = xsk_ring_prod__reserve(&xsk->umem->fq, rcvd,
> &idx_fq);
> }
>@@ -490,7 +504,8 @@ static inline void complete_tx_only(struct xsk_socket_info *xsk)
> if (!xsk->outstanding_tx)
> return;
>
>- kick_tx(xsk);
>+ if (!opt_busy_poll)
>+ kick_tx(xsk);
>
> rcvd = xsk_ring_cons__peek(&xsk->umem->cq, BATCH_SIZE, &idx);
> if (rcvd > 0) {
>@@ -500,10 +515,10 @@ static inline void complete_tx_only(struct xsk_socket_info *xsk)
> }
> }
>
>-static void rx_drop(struct xsk_socket_info *xsk)
>+static void rx_drop(struct xsk_socket_info *xsk, struct pollfd *fds)
> {
>- unsigned int rcvd, i;
> u32 idx_rx = 0, idx_fq = 0;
>+ unsigned int rcvd, i;
> int ret;
>
> rcvd = xsk_ring_cons__peek(&xsk->rx, BATCH_SIZE, &idx_rx);
>@@ -514,6 +529,8 @@ static void rx_drop(struct xsk_socket_info *xsk)
> while (ret != rcvd) {
> if (ret < 0)
> exit_with_error(-ret);
>+ if (opt_busy_poll)
>+ ret = poll(fds, num_socks, 0);
> ret = xsk_ring_prod__reserve(&xsk->umem->fq, rcvd, &idx_fq);
> }
>
>@@ -533,43 +550,68 @@ static void rx_drop(struct xsk_socket_info *xsk)
>
> static void rx_drop_all(void)
> {
>- struct pollfd fds[MAX_SOCKS + 1];
>- int i, ret, timeout, nfds = 1;
>+ struct pollfd fds[MAX_SOCKS];
>+ int i, ret;
>
> memset(fds, 0, sizeof(fds));
>
> for (i = 0; i < num_socks; i++) {
> fds[i].fd = xsk_socket__fd(xsks[i]->xsk);
> fds[i].events = POLLIN;
>- timeout = 1000; /* 1sn */
> }
>
> for (;;) {
> if (opt_poll) {
>- ret = poll(fds, nfds, timeout);
>+ ret = poll(fds, num_socks, 0);
> if (ret <= 0)
> continue;
> }
>
> for (i = 0; i < num_socks; i++)
>- rx_drop(xsks[i]);
>+ rx_drop(xsks[i], fds);
>+ }
>+}
>+
>+static void tx_only(struct xsk_socket_info *xsk, u32 frame_nb)
>+{
>+ u32 idx;
>+
>+ if (xsk_ring_prod__reserve(&xsk->tx, BATCH_SIZE, &idx) ==
>+ BATCH_SIZE) {
>+ unsigned int i;
>+
>+ for (i = 0; i < BATCH_SIZE; i++) {
>+ xsk_ring_prod__tx_desc(&xsk->tx, idx + i)->addr
>+ = (frame_nb + i) <<
>+ XSK_UMEM__DEFAULT_FRAME_SHIFT;
>+ xsk_ring_prod__tx_desc(&xsk->tx, idx + i)->len =
>+ sizeof(pkt_data) - 1;
>+ }
>+
>+ xsk_ring_prod__submit(&xsk->tx, BATCH_SIZE);
>+ xsk->outstanding_tx += BATCH_SIZE;
>+ frame_nb += BATCH_SIZE;
>+ frame_nb %= NUM_FRAMES;
> }
>+
>+ complete_tx_only(xsk);
> }
>
>-static void tx_only(struct xsk_socket_info *xsk)
>+static void tx_only_all(void)
> {
>- int timeout, ret, nfds = 1;
>- struct pollfd fds[nfds + 1];
>- u32 idx, frame_nb = 0;
>+ struct pollfd fds[MAX_SOCKS];
>+ u32 frame_nb[MAX_SOCKS] = {};
>+ int i, ret;
>
> memset(fds, 0, sizeof(fds));
>- fds[0].fd = xsk_socket__fd(xsk->xsk);
>- fds[0].events = POLLOUT;
>- timeout = 1000; /* 1sn */
>+ for (i = 0; i < num_socks; i++) {
>+ fds[0].fd = xsk_socket__fd(xsks[i]->xsk);
>+ fds[0].events = POLLOUT;
>+ }
>
> for (;;) {
> if (opt_poll) {
>- ret = poll(fds, nfds, timeout);
>+ ret = poll(fds, num_socks, 0);
> if (ret <= 0)
> continue;
>
>@@ -577,70 +619,75 @@ static void tx_only(struct xsk_socket_info *xsk)
> continue;
> }
>
>- if (xsk_ring_prod__reserve(&xsk->tx, BATCH_SIZE, &idx) ==
>- BATCH_SIZE) {
>- unsigned int i;
>-
>- for (i = 0; i < BATCH_SIZE; i++) {
>- xsk_ring_prod__tx_desc(&xsk->tx, idx + i)->addr
>- = (frame_nb + i) <<
>- XSK_UMEM__DEFAULT_FRAME_SHIFT;
>- xsk_ring_prod__tx_desc(&xsk->tx, idx + i)->len =
>- sizeof(pkt_data) - 1;
>- }
>-
>- xsk_ring_prod__submit(&xsk->tx, BATCH_SIZE);
>- xsk->outstanding_tx += BATCH_SIZE;
>- frame_nb += BATCH_SIZE;
>- frame_nb %= NUM_FRAMES;
>- }
>-
>- complete_tx_only(xsk);
>+ for (i = 0; i < num_socks; i++)
>+ tx_only(xsks[i], frame_nb[i]);
> }
> }
>
>-static void l2fwd(struct xsk_socket_info *xsk)
>+static void l2fwd(struct xsk_socket_info *xsk, struct pollfd *fds)
> {
>- for (;;) {
>- unsigned int rcvd, i;
>- u32 idx_rx = 0, idx_tx = 0;
>- int ret;
>+ unsigned int rcvd, i;
>+ u32 idx_rx = 0, idx_tx = 0;
>+ int ret;
>
>- for (;;) {
>- complete_tx_l2fwd(xsk);
>+ complete_tx_l2fwd(xsk, fds);
>
>- rcvd = xsk_ring_cons__peek(&xsk->rx, BATCH_SIZE,
>- &idx_rx);
>- if (rcvd > 0)
>- break;
>- }
>+ rcvd = xsk_ring_cons__peek(&xsk->rx, BATCH_SIZE,
>+ &idx_rx);
>+ if (!rcvd)
>+ return;
>
>+ ret = xsk_ring_prod__reserve(&xsk->tx, rcvd, &idx_tx);
>+ while (ret != rcvd) {
>+ if (ret < 0)
>+ exit_with_error(-ret);
>+ if (opt_busy_poll)
>+ ret = poll(fds, num_socks, 0);
> ret = xsk_ring_prod__reserve(&xsk->tx, rcvd, &idx_tx);
>- while (ret != rcvd) {
>- if (ret < 0)
>- exit_with_error(-ret);
>- ret = xsk_ring_prod__reserve(&xsk->tx, rcvd, &idx_tx);
>- }
>+ }
>+
>+ for (i = 0; i < rcvd; i++) {
>+ u64 addr = xsk_ring_cons__rx_desc(&xsk->rx,
>+ idx_rx)->addr;
>+ u32 len = xsk_ring_cons__rx_desc(&xsk->rx,
>+ idx_rx++)->len;
>+ char *pkt = xsk_umem__get_data(xsk->umem->buffer, addr);
>
>- for (i = 0; i < rcvd; i++) {
>- u64 addr = xsk_ring_cons__rx_desc(&xsk->rx,
>- idx_rx)->addr;
>- u32 len = xsk_ring_cons__rx_desc(&xsk->rx,
>- idx_rx++)->len;
>- char *pkt = xsk_umem__get_data(xsk->umem->buffer, addr);
>+ swap_mac_addresses(pkt);
>
>- swap_mac_addresses(pkt);
>+ hex_dump(pkt, len, addr);
>+ xsk_ring_prod__tx_desc(&xsk->tx, idx_tx)->addr = addr;
>+ xsk_ring_prod__tx_desc(&xsk->tx, idx_tx++)->len = len;
>+ }
>
>- hex_dump(pkt, len, addr);
>- xsk_ring_prod__tx_desc(&xsk->tx, idx_tx)->addr = addr;
>- xsk_ring_prod__tx_desc(&xsk->tx, idx_tx++)->len = len;
>- }
>+ xsk_ring_prod__submit(&xsk->tx, rcvd);
>+ xsk_ring_cons__release(&xsk->rx, rcvd);
>
>- xsk_ring_prod__submit(&xsk->tx, rcvd);
>- xsk_ring_cons__release(&xsk->rx, rcvd);
>+ xsk->rx_npkts += rcvd;
>+ xsk->outstanding_tx += rcvd;
>+}
>
>- xsk->rx_npkts += rcvd;
>- xsk->outstanding_tx += rcvd;
>+static void l2fwd_all(void)
>+{
>+ struct pollfd fds[MAX_SOCKS];
>+ int i, ret;
>+
>+ memset(fds, 0, sizeof(fds));
>+
>+ for (i = 0; i < num_socks; i++) {
>+ fds[i].fd = xsk_socket__fd(xsks[i]->xsk);
>+ fds[i].events = POLLOUT | POLLIN;
>+ }
>+
>+ for (;;) {
>+ if (opt_poll) {
>+ ret = poll(fds, num_socks, 0);
>+ if (ret <= 0)
>+ continue;
>+ }
>+
>+ for (i = 0; i < num_socks; i++)
>+ l2fwd(xsks[i], fds);
> }
> }
>
>@@ -693,9 +740,9 @@ int main(int argc, char **argv)
> if (opt_bench == BENCH_RXDROP)
> rx_drop_all();
> else if (opt_bench == BENCH_TXONLY)
>- tx_only(xsks[0]);
>+ tx_only_all();
> else
>- l2fwd(xsks[0]);
>+ l2fwd_all();
>
> return 0;
> }
>--
>2.7.4
>
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