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Date:   Fri, 28 Aug 2020 16:14:00 +0000
From:   "Janjua, Weqaar A" <weqaar.a.janjua@...el.com>
To:     "Karlsson, Magnus" <magnus.karlsson@...el.com>,
        "Topel, Bjorn" <bjorn.topel@...el.com>,
        "ast@...nel.org" <ast@...nel.org>,
        "daniel@...earbox.net" <daniel@...earbox.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "jonathan.lemon@...il.com" <jonathan.lemon@...il.com>
CC:     "bpf@...r.kernel.org" <bpf@...r.kernel.org>
Subject: RE: [PATCH bpf-next]
  0001-samples-bpf-fix-to-xdpsock-to-avoid-recycling-frames.patch

> -----Original Message-----
> From: Janjua, Weqaar A <weqaar.a.janjua@...el.com>
> Sent: Friday, August 28, 2020 4:20 PM
> To: Karlsson, Magnus <magnus.karlsson@...el.com>; Topel, Bjorn
> <bjorn.topel@...el.com>; ast@...nel.org; daniel@...earbox.net;
> netdev@...r.kernel.org; jonathan.lemon@...il.com
> Cc: Janjua, Weqaar A <weqaar.a.janjua@...el.com>; bpf@...r.kernel.org
> Subject: [PATCH bpf-next] 0001-samples-bpf-fix-to-xdpsock-to-avoid-
> recycling-frames.patch
> 
> ---
>  ...to-xdpsock-to-avoid-recycling-frames.patch | 62 +++++++++++++++++++
>  1 file changed, 62 insertions(+)
>  create mode 100644 0001-samples-bpf-fix-to-xdpsock-to-avoid-recycling-
> frames.patch
> 
> diff --git a/0001-samples-bpf-fix-to-xdpsock-to-avoid-recycling-frames.patch
> b/0001-samples-bpf-fix-to-xdpsock-to-avoid-recycling-frames.patch
> new file mode 100644
> index 000000000000..ae3b99b335e2
> --- /dev/null
> +++ b/0001-samples-bpf-fix-to-xdpsock-to-avoid-recycling-frames.patch
> @@ -0,0 +1,62 @@
> +From df0a23a79c9dca96c0059b4d766a613eba57200e Mon Sep 17
> 00:00:00 2001
> +From: Weqaar Janjua <weqaar.a.janjua@...el.com>
> +Date: Fri, 28 Aug 2020 13:36:32 +0100
> +Subject: [PATCH bpf-next] samples/bpf: fix to xdpsock to avoid
> +recycling  frames
> +To: magnus.karlsson@...el.com
> +
> +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: 248c7f9c0e21 ("samples/bpf: convert xdpsock to use libbpf for
> +AF_XDP access")
> +Signed-off-by: Weqaar Janjua <weqaar.a.janjua@...el.com>
> +---
> + samples/bpf/xdpsock_user.c | 10 +++++-----
> + 1 file changed, 5 insertions(+), 5 deletions(-)
> +
> +diff --git a/samples/bpf/xdpsock_user.c b/samples/bpf/xdpsock_user.c
> +index 19c679456a0e..c821e9867139 100644
> +--- a/samples/bpf/xdpsock_user.c
> ++++ b/samples/bpf/xdpsock_user.c
> +@@ -1004,7 +1004,7 @@ 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;
> + 	unsigned int i;
> +@@ -1017,14 +1017,14 @@ static void tx_only(struct xsk_socket_info
> *xsk, u32 frame_nb, int batch_size)
> + 	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->addr = (*frame_nb + i) <<
> XSK_UMEM__DEFAULT_FRAME_SHIFT;
> + 		tx_desc->len = PKT_SIZE;
> + 	}
> +
> + 	xsk_ring_prod__submit(&xsk->tx, batch_size);
> + 	xsk->outstanding_tx += batch_size;
> +-	frame_nb += batch_size;
> +-	frame_nb %= NUM_FRAMES;
> ++	*frame_nb += batch_size;
> ++	*frame_nb %= NUM_FRAMES;
> + 	complete_tx_only(xsk, batch_size);
> + }
> +
> +@@ -1080,7 +1080,7 @@ static void tx_only_all(void)
> + 		}
> +
> + 		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;
> +
> +--
> +2.20.1
> +
> --
> 2.20.1

[Janjua, Weqaar A] Apologies, please discard this patch, will resubmit.
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