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Message-Id: <20210617145534.101458-1-xuanzhuo@linux.alibaba.com>
Date: Thu, 17 Jun 2021 22:55:34 +0800
From: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
To: bpf@...r.kernel.org, netdev@...r.kernel.org
Cc: Jesse Brandeburg <jesse.brandeburg@...el.com>,
Tony Nguyen <anthony.l.nguyen@...el.com>,
"David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
Giuseppe Cavallaro <peppe.cavallaro@...com>,
Alexandre Torgue <alexandre.torgue@...s.st.com>,
Jose Abreu <joabreu@...opsys.com>,
Maxime Coquelin <mcoquelin.stm32@...il.com>,
Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Jesper Dangaard Brouer <hawk@...nel.org>,
John Fastabend <john.fastabend@...il.com>,
Björn Töpel <bjorn@...nel.org>,
Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
Krzysztof Kazimierczak <krzysztof.kazimierczak@...el.com>,
Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
Ong Boon Leong <boon.leong.ong@...el.com>,
intel-wired-lan@...ts.osuosl.org,
linux-stm32@...md-mailman.stormreply.com,
linux-arm-kernel@...ts.infradead.org
Subject: [PATCH net v2] xdp, net: fix for construct skb by xdp inside xsk zc rx
When each driver supports xsk rx, if the received buff returns XDP_PASS
after run xdp prog, it must construct skb based on xdp. This patch
extracts this logic into a public function xdp_construct_skb().
There is a bug in the original logic. When constructing skb, we should
copy the meta information to skb and then use __skb_pull() to correct
the data.
Fixes: 0a714186d3c0f ("i40e: add AF_XDP zero-copy Rx support")
Fixes: 2d4238f556972 ("ice: Add support for AF_XDP")
Fixes: bba2556efad66 ("net: stmmac: Enable RX via AF_XDP zero-copy")
Fixes: d0bcacd0a1309 ("ixgbe: add AF_XDP zero-copy Rx support")
Signed-off-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
---
drivers/net/ethernet/intel/i40e/i40e_xsk.c | 16 +---------
drivers/net/ethernet/intel/ice/ice_xsk.c | 12 +-------
drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c | 12 +-------
.../net/ethernet/stmicro/stmmac/stmmac_main.c | 23 +-------------
include/net/xdp.h | 30 +++++++++++++++++++
5 files changed, 34 insertions(+), 59 deletions(-)
diff --git a/drivers/net/ethernet/intel/i40e/i40e_xsk.c b/drivers/net/ethernet/intel/i40e/i40e_xsk.c
index 68f177a86403..81b0f44eedda 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_xsk.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_xsk.c
@@ -246,23 +246,9 @@ bool i40e_alloc_rx_buffers_zc(struct i40e_ring *rx_ring, u16 count)
static struct sk_buff *i40e_construct_skb_zc(struct i40e_ring *rx_ring,
struct xdp_buff *xdp)
{
- unsigned int metasize = xdp->data - xdp->data_meta;
- unsigned int datasize = xdp->data_end - xdp->data;
struct sk_buff *skb;
- /* allocate a skb to store the frags */
- skb = __napi_alloc_skb(&rx_ring->q_vector->napi,
- xdp->data_end - xdp->data_hard_start,
- GFP_ATOMIC | __GFP_NOWARN);
- if (unlikely(!skb))
- goto out;
-
- skb_reserve(skb, xdp->data - xdp->data_hard_start);
- memcpy(__skb_put(skb, datasize), xdp->data, datasize);
- if (metasize)
- skb_metadata_set(skb, metasize);
-
-out:
+ skb = xdp_construct_skb(xdp, &rx_ring->q_vector->napi);
xsk_buff_free(xdp);
return skb;
}
diff --git a/drivers/net/ethernet/intel/ice/ice_xsk.c b/drivers/net/ethernet/intel/ice/ice_xsk.c
index a1f89ea3c2bd..f95e1adcebda 100644
--- a/drivers/net/ethernet/intel/ice/ice_xsk.c
+++ b/drivers/net/ethernet/intel/ice/ice_xsk.c
@@ -430,22 +430,12 @@ static void ice_bump_ntc(struct ice_ring *rx_ring)
static struct sk_buff *
ice_construct_skb_zc(struct ice_ring *rx_ring, struct ice_rx_buf *rx_buf)
{
- unsigned int metasize = rx_buf->xdp->data - rx_buf->xdp->data_meta;
- unsigned int datasize = rx_buf->xdp->data_end - rx_buf->xdp->data;
- unsigned int datasize_hard = rx_buf->xdp->data_end -
- rx_buf->xdp->data_hard_start;
struct sk_buff *skb;
- skb = __napi_alloc_skb(&rx_ring->q_vector->napi, datasize_hard,
- GFP_ATOMIC | __GFP_NOWARN);
+ skb = xdp_construct_skb(rx_buf->xdp, &rx_ring->q_vector->napi);
if (unlikely(!skb))
return NULL;
- skb_reserve(skb, rx_buf->xdp->data - rx_buf->xdp->data_hard_start);
- memcpy(__skb_put(skb, datasize), rx_buf->xdp->data, datasize);
- if (metasize)
- skb_metadata_set(skb, metasize);
-
xsk_buff_free(rx_buf->xdp);
rx_buf->xdp = NULL;
return skb;
diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c
index f72d2978263b..123945832c96 100644
--- a/drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c
+++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c
@@ -203,22 +203,12 @@ bool ixgbe_alloc_rx_buffers_zc(struct ixgbe_ring *rx_ring, u16 count)
static struct sk_buff *ixgbe_construct_skb_zc(struct ixgbe_ring *rx_ring,
struct ixgbe_rx_buffer *bi)
{
- unsigned int metasize = bi->xdp->data - bi->xdp->data_meta;
- unsigned int datasize = bi->xdp->data_end - bi->xdp->data;
struct sk_buff *skb;
- /* allocate a skb to store the frags */
- skb = __napi_alloc_skb(&rx_ring->q_vector->napi,
- bi->xdp->data_end - bi->xdp->data_hard_start,
- GFP_ATOMIC | __GFP_NOWARN);
+ skb = xdp_construct_skb(bi->xdp, &rx_ring->q_vector->napi);
if (unlikely(!skb))
return NULL;
- skb_reserve(skb, bi->xdp->data - bi->xdp->data_hard_start);
- memcpy(__skb_put(skb, datasize), bi->xdp->data, datasize);
- if (metasize)
- skb_metadata_set(skb, metasize);
-
xsk_buff_free(bi->xdp);
bi->xdp = NULL;
return skb;
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index c87202cbd3d6..143ac1edb876 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -4729,27 +4729,6 @@ static void stmmac_finalize_xdp_rx(struct stmmac_priv *priv,
xdp_do_flush();
}
-static struct sk_buff *stmmac_construct_skb_zc(struct stmmac_channel *ch,
- struct xdp_buff *xdp)
-{
- unsigned int metasize = xdp->data - xdp->data_meta;
- unsigned int datasize = xdp->data_end - xdp->data;
- struct sk_buff *skb;
-
- skb = __napi_alloc_skb(&ch->rxtx_napi,
- xdp->data_end - xdp->data_hard_start,
- GFP_ATOMIC | __GFP_NOWARN);
- if (unlikely(!skb))
- return NULL;
-
- skb_reserve(skb, xdp->data - xdp->data_hard_start);
- memcpy(__skb_put(skb, datasize), xdp->data, datasize);
- if (metasize)
- skb_metadata_set(skb, metasize);
-
- return skb;
-}
-
static void stmmac_dispatch_skb_zc(struct stmmac_priv *priv, u32 queue,
struct dma_desc *p, struct dma_desc *np,
struct xdp_buff *xdp)
@@ -4761,7 +4740,7 @@ static void stmmac_dispatch_skb_zc(struct stmmac_priv *priv, u32 queue,
struct sk_buff *skb;
u32 hash;
- skb = stmmac_construct_skb_zc(ch, xdp);
+ skb = xdp_construct_skb(xdp, &ch->rxtx_napi);
if (!skb) {
priv->dev->stats.rx_dropped++;
return;
diff --git a/include/net/xdp.h b/include/net/xdp.h
index a5bc214a49d9..561e21eaf718 100644
--- a/include/net/xdp.h
+++ b/include/net/xdp.h
@@ -95,6 +95,36 @@ xdp_prepare_buff(struct xdp_buff *xdp, unsigned char *hard_start,
xdp->data_meta = meta_valid ? data : data + 1;
}
+static __always_inline struct sk_buff *
+xdp_construct_skb(struct xdp_buff *xdp, struct napi_struct *napi)
+{
+ unsigned int metasize;
+ unsigned int datasize;
+ unsigned int headroom;
+ struct sk_buff *skb;
+ unsigned int len;
+
+ /* this include metasize */
+ datasize = xdp->data_end - xdp->data_meta;
+ metasize = xdp->data - xdp->data_meta;
+ headroom = xdp->data_meta - xdp->data_hard_start;
+ len = xdp->data_end - xdp->data_hard_start;
+
+ /* allocate a skb to store the frags */
+ skb = __napi_alloc_skb(napi, len, GFP_ATOMIC | __GFP_NOWARN);
+ if (unlikely(!skb))
+ return NULL;
+
+ skb_reserve(skb, headroom);
+ memcpy(__skb_put(skb, datasize), xdp->data_meta, datasize);
+ if (metasize) {
+ __skb_pull(skb, metasize);
+ skb_metadata_set(skb, metasize);
+ }
+
+ return skb;
+}
+
/* Reserve memory area at end-of data area.
*
* This macro reserves tailroom in the XDP buffer by limiting the
--
2.31.0
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