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Message-ID: <20241107212309.3097362-4-almasrymina@google.com>
Date: Thu, 7 Nov 2024 21:23:07 +0000
From: Mina Almasry <almasrymina@...gle.com>
To: netdev@...r.kernel.org, Jakub Kicinski <kuba@...nel.org>,
Mina Almasry <almasrymina@...gle.com>, Pavel Begunkov <asml.silence@...il.com>,
Willem de Bruijn <willemb@...gle.com>, Kaiyuan Zhang <kaiyuanz@...gle.com>,
Samiullah Khawaja <skhawaja@...gle.com>, linux-kernel@...r.kernel.org
Cc: "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
Paolo Abeni <pabeni@...hat.com>, Simon Horman <horms@...nel.org>,
Jesper Dangaard Brouer <hawk@...nel.org>, Ilias Apalodimas <ilias.apalodimas@...aro.org>,
Jason Gunthorpe <jgg@...pe.ca>
Subject: [PATCH net-next v2 3/5] page_pool: Set `dma_sync` to false for devmem
memory provider
From: Samiullah Khawaja <skhawaja@...gle.com>
Move the `dma_map` and `dma_sync` checks to `page_pool_init` to make
them generic. Set dma_sync to false for devmem memory provider because
the dma_sync APIs should not be used for dma_buf backed devmem memory
provider.
Cc: Jason Gunthorpe <jgg@...pe.ca>
Signed-off-by: Samiullah Khawaja <skhawaja@...gle.com>
Signed-off-by: Mina Almasry <almasrymina@...gle.com>
---
net/core/devmem.c | 9 ++++-----
net/core/page_pool.c | 3 +++
2 files changed, 7 insertions(+), 5 deletions(-)
diff --git a/net/core/devmem.c b/net/core/devmem.c
index 11b91c12ee11..826d0b00159f 100644
--- a/net/core/devmem.c
+++ b/net/core/devmem.c
@@ -331,11 +331,10 @@ int mp_dmabuf_devmem_init(struct page_pool *pool)
if (!binding)
return -EINVAL;
- if (!pool->dma_map)
- return -EOPNOTSUPP;
-
- if (pool->dma_sync)
- return -EOPNOTSUPP;
+ /* dma-buf dma addresses should not be used with
+ * dma_sync_for_cpu/device. Force disable dma_sync.
+ */
+ pool->dma_sync = false;
if (pool->p.order != 0)
return -E2BIG;
diff --git a/net/core/page_pool.c b/net/core/page_pool.c
index 77de79c1933b..528dd4d18eab 100644
--- a/net/core/page_pool.c
+++ b/net/core/page_pool.c
@@ -287,6 +287,9 @@ static int page_pool_init(struct page_pool *pool,
}
if (pool->mp_priv) {
+ if (!pool->dma_map || !pool->dma_sync)
+ return -EOPNOTSUPP;
+
err = mp_dmabuf_devmem_init(pool);
if (err) {
pr_warn("%s() mem-provider init failed %d\n", __func__,
--
2.47.0.277.g8800431eea-goog
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