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Date: Fri, 20 Dec 2019 14:25:28 +0530
From: Jay Jayatheerthan <jay.jayatheerthan@...el.com>
To: magnus.karlsson@...el.com, bjorn.topel@...el.com, ast@...nel.org,
daniel@...earbox.net, netdev@...r.kernel.org,
jonathan.lemon@...il.com
Cc: bpf@...r.kernel.org,
Jay Jayatheerthan <jay.jayatheerthan@...el.com>
Subject: [PATCH bpf-next 4/6] samples/bpf: xdpsock: Add option to specify number of packets to send
Use '-C' or '--tx-pkt-count' to specify number of packets to send.
If it is not specified, the application sends packets forever. If packet
count is not a multiple of batch size, last batch sent is less than the
batch size.
Signed-off-by: Jay Jayatheerthan <jay.jayatheerthan@...el.com>
---
samples/bpf/xdpsock_user.c | 73 ++++++++++++++++++++++++++++++--------
1 file changed, 59 insertions(+), 14 deletions(-)
diff --git a/samples/bpf/xdpsock_user.c b/samples/bpf/xdpsock_user.c
index 1ba3e7142f39..f96ce3055d46 100644
--- a/samples/bpf/xdpsock_user.c
+++ b/samples/bpf/xdpsock_user.c
@@ -68,6 +68,7 @@ static unsigned long opt_duration;
static unsigned long start_time;
static bool benchmark_done;
static u32 opt_batch_size = 64;
+static int opt_pkt_count;
static int opt_poll;
static int opt_interval = 1;
static u32 opt_xdp_bind_flags = XDP_USE_NEED_WAKEUP;
@@ -392,6 +393,7 @@ static struct option long_options[] = {
{"force", no_argument, 0, 'F'},
{"duration", required_argument, 0, 'd'},
{"batch-size", required_argument, 0, 'b'},
+ {"tx-pkt-count", required_argument, 0, 'C'},
{0, 0, 0, 0}
};
@@ -420,6 +422,8 @@ static void usage(const char *prog)
" Default: forever.\n"
" -b, --batch-size=n Batch size for sending or receiving\n"
" packets. Default: %d\n"
+ " -C, --tx-pkt-count=n Number of packets to send.\n"
+ " Default: Continuous packets.\n"
"\n";
fprintf(stderr, str, prog, XSK_UMEM__DEFAULT_FRAME_SIZE,
opt_batch_size);
@@ -433,7 +437,7 @@ static void parse_command_line(int argc, char **argv)
opterr = 0;
for (;;) {
- c = getopt_long(argc, argv, "Frtli:q:pSNn:czf:muMd:b:",
+ c = getopt_long(argc, argv, "Frtli:q:pSNn:czf:muMd:b:C:",
long_options, &option_index);
if (c == -1)
break;
@@ -498,6 +502,9 @@ static void parse_command_line(int argc, char **argv)
case 'b':
opt_batch_size = atoi(optarg);
break;
+ case 'C':
+ opt_pkt_count = atoi(optarg);
+ break;
default:
usage(basename(argv[0]));
}
@@ -574,7 +581,8 @@ static inline void complete_tx_l2fwd(struct xsk_socket_info *xsk,
}
}
-static inline void complete_tx_only(struct xsk_socket_info *xsk)
+static inline void complete_tx_only(struct xsk_socket_info *xsk,
+ int batch_size)
{
unsigned int rcvd;
u32 idx;
@@ -585,7 +593,7 @@ static inline void complete_tx_only(struct xsk_socket_info *xsk)
if (!opt_need_wakeup || xsk_ring_prod__needs_wakeup(&xsk->tx))
kick_tx(xsk);
- rcvd = xsk_ring_cons__peek(&xsk->umem->cq, opt_batch_size, &idx);
+ rcvd = xsk_ring_cons__peek(&xsk->umem->cq, batch_size, &idx);
if (rcvd > 0) {
xsk_ring_cons__release(&xsk->umem->cq, rcvd);
xsk->outstanding_tx -= rcvd;
@@ -657,34 +665,62 @@ static void rx_drop_all(void)
}
}
-static void tx_only(struct xsk_socket_info *xsk, u32 frame_nb)
+static void tx_only(struct xsk_socket_info *xsk, u32 frame_nb, int batch_size)
{
u32 idx;
unsigned int i;
- while (xsk_ring_prod__reserve(&xsk->tx, opt_batch_size, &idx) <
- opt_batch_size) {
- complete_tx_only(xsk);
+ while (xsk_ring_prod__reserve(&xsk->tx, batch_size, &idx) <
+ batch_size) {
+ complete_tx_only(xsk, batch_size);
}
- for (i = 0; i < opt_batch_size; i++) {
+ for (i = 0; i < batch_size; i++) {
struct xdp_desc *tx_desc = xsk_ring_prod__tx_desc(&xsk->tx,
idx + i);
tx_desc->addr = (frame_nb + i) << XSK_UMEM__DEFAULT_FRAME_SHIFT;
tx_desc->len = sizeof(pkt_data) - 1;
}
- xsk_ring_prod__submit(&xsk->tx, opt_batch_size);
- xsk->outstanding_tx += opt_batch_size;
- frame_nb += opt_batch_size;
+ 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);
+ complete_tx_only(xsk, batch_size);
+}
+
+static inline int get_batch_size(int pkt_cnt)
+{
+ if (!opt_pkt_count)
+ return opt_batch_size;
+
+ if (pkt_cnt + opt_batch_size <= opt_pkt_count)
+ return opt_batch_size;
+
+ return opt_pkt_count - pkt_cnt;
+}
+
+static void complete_tx_only_all(void)
+{
+ bool pending;
+ int i;
+
+ do {
+ pending = false;
+ for (i = 0; i < num_socks; i++) {
+ if (xsks[i]->outstanding_tx) {
+ complete_tx_only(xsks[i], opt_batch_size);
+ pending = !!xsks[i]->outstanding_tx;
+ }
+ }
+ } while (pending);
}
static void tx_only_all(void)
{
struct pollfd fds[MAX_SOCKS] = {};
u32 frame_nb[MAX_SOCKS] = {};
+ int pkt_cnt = 0;
int i, ret;
for (i = 0; i < num_socks; i++) {
@@ -692,7 +728,9 @@ static void tx_only_all(void)
fds[0].events = POLLOUT;
}
- for (;;) {
+ while ((opt_pkt_count && pkt_cnt < opt_pkt_count) || !opt_pkt_count) {
+ int batch_size = get_batch_size(pkt_cnt);
+
if (opt_poll) {
ret = poll(fds, num_socks, opt_timeout);
if (ret <= 0)
@@ -703,11 +741,16 @@ static void tx_only_all(void)
}
for (i = 0; i < num_socks; i++)
- tx_only(xsks[i], frame_nb[i]);
+ tx_only(xsks[i], frame_nb[i], batch_size);
+
+ pkt_cnt += batch_size;
if (benchmark_done)
break;
}
+
+ if (opt_pkt_count)
+ complete_tx_only_all();
}
static void l2fwd(struct xsk_socket_info *xsk, struct pollfd *fds)
@@ -900,6 +943,8 @@ int main(int argc, char **argv)
else
l2fwd_all();
+ benchmark_done = true;
+
pthread_join(pt, NULL);
xdpsock_cleanup();
--
2.17.1
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