Commit 90da4b32 authored by Magnus Karlsson's avatar Magnus Karlsson Committed by Daniel Borkmann

samples/bpf: Increment Tx stats at sending

Increment the statistics over how many Tx packets have been sent at
the time of sending instead of at the time of completion. This as a
completion event means that the buffer has been sent AND returned to
user space. The packet always gets sent shortly after sendto() is
called. The kernel might, for performance reasons, decide to not
return every single buffer to user space immediately after sending,
for example, only after a batch of packets have been
transmitted. Incrementing the number of packets sent at completion,
will in that case be confusing as if you send a single packet, the
counter might show zero for a while even though the packet has been
transmitted.
Signed-off-by: default avatarMagnus Karlsson <magnus.karlsson@intel.com>
Signed-off-by: default avatarDaniel Borkmann <daniel@iogearbox.net>
Acked-by: default avatarJohn Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/1605525167-14450-2-git-send-email-magnus.karlsson@gmail.com
parent de91e631
......@@ -1146,7 +1146,6 @@ static inline void complete_tx_l2fwd(struct xsk_socket_info *xsk,
xsk_ring_prod__submit(&xsk->umem->fq, rcvd);
xsk_ring_cons__release(&xsk->umem->cq, rcvd);
xsk->outstanding_tx -= rcvd;
xsk->ring_stats.tx_npkts += rcvd;
}
}
......@@ -1168,7 +1167,6 @@ static inline void complete_tx_only(struct xsk_socket_info *xsk,
if (rcvd > 0) {
xsk_ring_cons__release(&xsk->umem->cq, rcvd);
xsk->outstanding_tx -= rcvd;
xsk->ring_stats.tx_npkts += rcvd;
}
}
......@@ -1260,6 +1258,7 @@ static void tx_only(struct xsk_socket_info *xsk, u32 *frame_nb, int batch_size)
}
xsk_ring_prod__submit(&xsk->tx, batch_size);
xsk->ring_stats.tx_npkts += batch_size;
xsk->outstanding_tx += batch_size;
*frame_nb += batch_size;
*frame_nb %= NUM_FRAMES;
......@@ -1348,6 +1347,7 @@ static void l2fwd(struct xsk_socket_info *xsk, struct pollfd *fds)
}
return;
}
xsk->ring_stats.rx_npkts += rcvd;
ret = xsk_ring_prod__reserve(&xsk->tx, rcvd, &idx_tx);
while (ret != rcvd) {
......@@ -1379,7 +1379,7 @@ static void l2fwd(struct xsk_socket_info *xsk, struct pollfd *fds)
xsk_ring_prod__submit(&xsk->tx, rcvd);
xsk_ring_cons__release(&xsk->rx, rcvd);
xsk->ring_stats.rx_npkts += rcvd;
xsk->ring_stats.tx_npkts += rcvd;
xsk->outstanding_tx += rcvd;
}
......
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