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thunderx: enable page recycling for non-XDP case 

Commit 773225388d ("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: 773225388d ("net: thunderx: Optimize page recycling for XDP")
Signed-off-by: Dean Nelson <dnelson@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dean Nelson 2019-03-26 11:53:19 -04:00 committed by David S. Miller
parent 7f07e5f1f7
commit b3e2080694
1 changed files with 11 additions and 12 deletions
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23
drivers/net/ethernet/cavium/thunder/nicvf_queues.c
View File

@ -105,20 +105,19 @@ static inline struct pgcache *nicvf_alloc_page(struct nicvf *nic,
/* 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) {