Re: [PATCH v2 15/16] netdevsim: use netmem descriptor and APIs for page pool

To simplify struct page, the effort to separate its own descriptor from
struct page is required and the work for page pool is on going.

Use netmem descriptor and APIs for page pool in netdevsim code.

Signed-off-by: Byungchul Park <byungchul@sk.com>
---
 drivers/net/netdevsim/netdev.c    | 19 ++++++++++---------
 drivers/net/netdevsim/netdevsim.h |  2 +-
 2 files changed, 11 insertions(+), 10 deletions(-)

diff --git a/drivers/net/netdevsim/netdev.c b/drivers/net/netdevsim/netdev.c
index af545d42961c..d134a6195bfa 100644
--- a/drivers/net/netdevsim/netdev.c
+++ b/drivers/net/netdevsim/netdev.c

@@ -821,7 +821,7 @@ nsim_pp_hold_read(struct file *file, char __user *data,
        struct netdevsim *ns = file->private_data;
        char buf[3] = "n\n";

-       if (ns->page)
+       if (ns->netmem)
                buf[0] = 'y';

        return simple_read_from_buffer(data, count, ppos, buf, 2);

@@ -841,18 +841,19 @@ nsim_pp_hold_write(struct file *file, const char __user *data,

        rtnl_lock();
        ret = count;
-       if (val == !!ns->page)
+       if (val == !!ns->netmem)
                goto exit;

        if (!netif_running(ns->netdev) && val) {
                ret = -ENETDOWN;
        } else if (val) {
-               ns->page = page_pool_dev_alloc_pages(ns->rq[0]->page_pool);
-               if (!ns->page)
+               ns->netmem = page_pool_alloc_netmems(ns->rq[0]->page_pool,
+                                                    GFP_ATOMIC | __GFP_NOWARN);