From: Jakub Kicinski <jakub.kicinski@netronome.com>
Date: Fri, 27 Jul 2018 20:20:08 -0700
Subject: net: xsk: don't return frames via the allocator on error
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Patch-mainline: v4.18-rc8
Git-commit: 2d55d614fcf58187e2937dba11643b9471cd64d7
References: bsc#1109837
xdp_return_buff() is used when frame has been successfully
handled (transmitted) or if an error occurred during delayed
processing and there is no way to report it back to
xdp_do_redirect().
In case of __xsk_rcv_zc() error is propagated all the way
back to the driver, so there is no need to call
xdp_return_buff(). Driver will recycle the frame anyway
after seeing that error happened.
Fixes: 173d3adb6f43 ("xsk: add zero-copy support for Rx")
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Acked-by: Björn Töpel <bjorn.topel@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
net/xdp/xsk.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
--- a/net/xdp/xsk.c
+++ b/net/xdp/xsk.c
@@ -84,10 +84,8 @@ static int __xsk_rcv_zc(struct xdp_sock
{
int err = xskq_produce_batch_desc(xs->rx, (u64)xdp->handle, len);
- if (err) {
- xdp_return_buff(xdp);
+ if (err)
xs->rx_dropped++;
- }
return err;
}