4.14-stable review patch. If anyone has any objections, please let me know.
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From: Dean Nelson dnelson@redhat.com
[ Upstream commit b3e208069477588c06f4d5d986164b435bb06e6d ]
Commit 773225388dae15e72790 ("net: thunderx: Optimize page recycling for XDP") added code to nicvf_alloc_page() that inadvertently disables receive buffer page recycling for the non-XDP case by always NULL'ng the page pointer.
This patch corrects two if-conditionals to allow for the recycling of non-XDP mode pages by only setting the page pointer to NULL when the page is not ready for recycling.
Fixes: 773225388dae ("net: thunderx: Optimize page recycling for XDP") Signed-off-by: Dean Nelson dnelson@redhat.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/ethernet/cavium/thunder/nicvf_queues.c | 23 ++++++++++----------- 1 file changed, 11 insertions(+), 12 deletions(-)
--- a/drivers/net/ethernet/cavium/thunder/nicvf_queues.c +++ b/drivers/net/ethernet/cavium/thunder/nicvf_queues.c @@ -105,20 +105,19 @@ static inline struct pgcache *nicvf_allo /* Check if page can be recycled */ if (page) { ref_count = page_ref_count(page); - /* Check if this page has been used once i.e 'put_page' - * called after packet transmission i.e internal ref_count - * and page's ref_count are equal i.e page can be recycled. + /* This page can be recycled if internal ref_count and page's + * ref_count are equal, indicating that the page has been used + * once for packet transmission. For non-XDP mode, internal + * ref_count is always '1'. */ - if (rbdr->is_xdp && (ref_count == pgcache->ref_count)) - pgcache->ref_count--; - else - page = NULL; - - /* In non-XDP mode, page's ref_count needs to be '1' for it - * to be recycled. - */ - if (!rbdr->is_xdp && (ref_count != 1)) + if (rbdr->is_xdp) { + if (ref_count == pgcache->ref_count) + pgcache->ref_count--; + else + page = NULL; + } else if (ref_count != 1) { page = NULL; + } }
if (!page) {