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| author | Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org> | 2019-07-09 00:34:28 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-07-08 14:58:04 -0700 |
| commit | 1da4bbeffe41ba318812d7590955faee8636668b (patch) | |
| tree | 17ca1d60db2d00c72bc573e3fa48597f4908e7d8 /net/core/xdp.c | |
| parent | 49db9228b8d83cbdef44b4757a393990f48b6d85 (diff) | |
| download | linux-1da4bbeffe41ba318812d7590955faee8636668b.tar.bz2 | |
net: core: page_pool: add user refcnt and reintroduce page_pool_destroy
Jesper recently removed page_pool_destroy() (from driver invocation)
and moved shutdown and free of page_pool into xdp_rxq_info_unreg(),
in-order to handle in-flight packets/pages. This created an asymmetry
in drivers create/destroy pairs.
This patch reintroduce page_pool_destroy and add page_pool user
refcnt. This serves the purpose to simplify drivers error handling as
driver now drivers always calls page_pool_destroy() and don't need to
track if xdp_rxq_info_reg_mem_model() was unsuccessful.
This could be used for a special cases where a single RX-queue (with a
single page_pool) provides packets for two net_device'es, and thus
needs to register the same page_pool twice with two xdp_rxq_info
structures.
This patch is primarily to ease API usage for drivers. The recently
merged netsec driver, actually have a bug in this area, which is
solved by this API change.
This patch is a modified version of Ivan Khoronzhuk's original patch.
Link: https://lore.kernel.org/netdev/20190625175948.24771-2-ivan.khoronzhuk@linaro.org/
Fixes: 5c67bf0ec4d0 ("net: netsec: Use page_pool API")
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>
Reviewed-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/xdp.c')
| -rw-r--r-- | net/core/xdp.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/net/core/xdp.c b/net/core/xdp.c index 829377cc83db..d7bf62ffbb5e 100644 --- a/net/core/xdp.c +++ b/net/core/xdp.c @@ -370,6 +370,9 @@ int xdp_rxq_info_reg_mem_model(struct xdp_rxq_info *xdp_rxq, goto err; } + if (type == MEM_TYPE_PAGE_POOL) + page_pool_get(xdp_alloc->page_pool); + mutex_unlock(&mem_id_lock); trace_mem_connect(xdp_alloc, xdp_rxq); |