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samples/bpf: Fix to xdpsock to avoid recycling frames

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The txpush program in the xdpsock sample application is supposed
to send out all packets in the umem in a round-robin fashion.
The problem is that it only cycled through the first BATCH_SIZE
worth of packets. Fixed this so that it cycles through all buffers
in the umem as intended.

Fixes: 248c7f9c0e ("samples/bpf: convert xdpsock to use libbpf for AF_XDP access")
Signed-off-by: Weqaar Janjua <weqaar.a.janjua@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Björn Töpel <bjorn.topel@intel.com>
Link: https://lore.kernel.org/bpf/20200828161717.42705-1-weqaar.a.janjua@intel.com
This commit is contained in:
Weqaar Janjua 2020-08-29 00:17:17 +08:00 committed by Daniel Borkmann
parent c8a039a47f
commit b69e56cf76
1 changed files with 5 additions and 5 deletions
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10
samples/bpf/xdpsock_user.c
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@ -1010,7 +1010,7 @@ static void rx_drop_all(void)
} }
} }
static void tx_only(struct xsk_socket_info *xsk, u32 frame_nb, int batch_size) static void tx_only(struct xsk_socket_info *xsk, u32 *frame_nb, int batch_size)
{ {
u32 idx; u32 idx;
unsigned int i; unsigned int i;
@ -1023,14 +1023,14 @@ static void tx_only(struct xsk_socket_info *xsk, u32 frame_nb, int batch_size)
for (i = 0; i < batch_size; i++) { for (i = 0; i < batch_size; i++) {
struct xdp_desc *tx_desc = xsk_ring_prod__tx_desc(&xsk->tx, struct xdp_desc *tx_desc = xsk_ring_prod__tx_desc(&xsk->tx,
idx + i); idx + i);
tx_desc->addr = (frame_nb + i) << XSK_UMEM__DEFAULT_FRAME_SHIFT; tx_desc->addr = (*frame_nb + i) << XSK_UMEM__DEFAULT_FRAME_SHIFT;
tx_desc->len = PKT_SIZE; tx_desc->len = PKT_SIZE;
} }
xsk_ring_prod__submit(&xsk->tx, batch_size); xsk_ring_prod__submit(&xsk->tx, batch_size);
xsk->outstanding_tx += batch_size; xsk->outstanding_tx += batch_size;
frame_nb += batch_size; *frame_nb += batch_size;
frame_nb %= NUM_FRAMES; *frame_nb %= NUM_FRAMES;
complete_tx_only(xsk, batch_size); complete_tx_only(xsk, batch_size);
} }
@ -1086,7 +1086,7 @@ static void tx_only_all(void)
} }
for (i = 0; i < num_socks; i++) for (i = 0; i < num_socks; i++)
tx_only(xsks[i], frame_nb[i], batch_size); tx_only(xsks[i], &frame_nb[i], batch_size);
pkt_cnt += batch_size; pkt_cnt += batch_size;