linux-kernel - [PATCH net-next v2 1/3] xsk: Remove non-zero 'dma_page' check in xp_assign

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Date: Wed, 28 Feb 2024 19:05:25 +0800
From: Yunjian Wang <wangyunjian@...wei.com>
To: <mst@...hat.com>, <willemdebruijn.kernel@...il.com>,
	<jasowang@...hat.com>, <kuba@...nel.org>, <bjorn@...nel.org>,
	<magnus.karlsson@...el.com>, <maciej.fijalkowski@...el.com>,
	<jonathan.lemon@...il.com>, <davem@...emloft.net>
CC: <bpf@...r.kernel.org>, <netdev@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <kvm@...r.kernel.org>,
	<virtualization@...ts.linux.dev>, <xudingke@...wei.com>,
	<liwei395@...wei.com>, Yunjian Wang <wangyunjian@...wei.com>
Subject: [PATCH net-next v2 1/3] xsk: Remove non-zero 'dma_page' check in xp_assign_dev

Now dma mappings are used by the physical NICs. However the vNIC
maybe do not need them. So remove non-zero 'dma_page' check in
xp_assign_dev.

Signed-off-by: Yunjian Wang <wangyunjian@...wei.com>
---
 net/xdp/xsk_buff_pool.c | 7 -------
 1 file changed, 7 deletions(-)

diff --git a/net/xdp/xsk_buff_pool.c b/net/xdp/xsk_buff_pool.c
index ce60ecd48a4d..a5af75b1f43c 100644
--- a/net/xdp/xsk_buff_pool.c
+++ b/net/xdp/xsk_buff_pool.c
@@ -219,16 +219,9 @@ int xp_assign_dev(struct xsk_buff_pool *pool,
 	if (err)
 		goto err_unreg_pool;
 
-	if (!pool->dma_pages) {
-		WARN(1, "Driver did not DMA map zero-copy buffers");
-		err = -EINVAL;
-		goto err_unreg_xsk;
-	}
 	pool->umem->zc = true;
 	return 0;
 
-err_unreg_xsk:
-	xp_disable_drv_zc(pool);
 err_unreg_pool:
 	if (!force_zc)
 		err = 0; /* fallback to copy mode */
-- 
2.41.0