[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

> -----Original Message-----
> From: Janjua, Weqaar A <weqaar.a.janjua@intel.com>
> Sent: Friday, August 28, 2020 4:20 PM
> To: Karlsson, Magnus <magnus.karlsson@intel.com>; Topel, Bjorn
> <bjorn.topel@intel.com>; ast@kernel.org; daniel@iogearbox.net;
> netdev@vger.kernel.org; jonathan.lemon@gmail.com
> Cc: Janjua, Weqaar A <weqaar.a.janjua@intel.com>; bpf@vger.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@intel.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@intel.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@intel.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.
--------------------------------------------------------------
Intel Research and Development Ireland Limited
Registered in Ireland
Registered Office: Collinstown Industrial Park, Leixlip, County Kildare
Registered Number: 308263


This e-mail and any attachments may contain confidential material for the sole
use of the intended recipient(s). Any review or distribution by others is
strictly prohibited. If you are not the intended recipient, please contact the
sender and delete all copies.