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Message-ID: <20241030165201.442301-15-aleksander.lobakin@intel.com>
Date: Wed, 30 Oct 2024 17:51:57 +0100
From: Alexander Lobakin <aleksander.lobakin@...el.com>
To: "David S. Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>
Cc: Alexander Lobakin <aleksander.lobakin@...el.com>,
Toke Høiland-Jørgensen <toke@...hat.com>,
Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
John Fastabend <john.fastabend@...il.com>,
Andrii Nakryiko <andrii@...nel.org>,
Maciej Fijalkowski <maciej.fijalkowski@...el.com>,
Stanislav Fomichev <sdf@...ichev.me>,
Magnus Karlsson <magnus.karlsson@...el.com>,
nex.sw.ncis.osdt.itp.upstreaming@...el.com,
bpf@...r.kernel.org,
netdev@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH net-next v3 14/18] xsk: make xsk_buff_add_frag really add a frag via __xdp_buff_add_frag()
Currently, xsk_buff_add_frag() only adds a frag to the pool linked list,
not doing anything with the &xdp_buff. The drivers do that manually and
the logic is the same.
Make it really add an skb frag, just like xdp_buff_add_frag() does that,
and freeing frags on error if needed. This allows to remove repeating
code from i40e and ice and not add the same code again and again.
Acked-by: Maciej Fijalkowski <maciej.fijalkowski@...el.com>
Signed-off-by: Alexander Lobakin <aleksander.lobakin@...el.com>
---
include/net/xdp_sock_drv.h | 18 ++++++++++--
drivers/net/ethernet/intel/i40e/i40e_xsk.c | 30 ++------------------
drivers/net/ethernet/intel/ice/ice_xsk.c | 32 ++--------------------
3 files changed, 20 insertions(+), 60 deletions(-)
diff --git a/include/net/xdp_sock_drv.h b/include/net/xdp_sock_drv.h
index f3175a5d28f7..6aae95b83645 100644
--- a/include/net/xdp_sock_drv.h
+++ b/include/net/xdp_sock_drv.h
@@ -136,11 +136,21 @@ static inline void xsk_buff_free(struct xdp_buff *xdp)
xp_free(xskb);
}
-static inline void xsk_buff_add_frag(struct xdp_buff *xdp)
+static inline bool xsk_buff_add_frag(struct xdp_buff *head,
+ struct xdp_buff *xdp)
{
- struct xdp_buff_xsk *frag = container_of(xdp, struct xdp_buff_xsk, xdp);
+ const void *data = xdp->data;
+ struct xdp_buff_xsk *frag;
+
+ if (!__xdp_buff_add_frag(head, virt_to_page(data),
+ offset_in_page(data), xdp->data_end - data,
+ xdp->frame_sz, false))
+ return false;
+ frag = container_of(xdp, struct xdp_buff_xsk, xdp);
list_add_tail(&frag->list_node, &frag->pool->xskb_list);
+
+ return true;
}
static inline struct xdp_buff *xsk_buff_get_frag(const struct xdp_buff *first)
@@ -357,8 +367,10 @@ static inline void xsk_buff_free(struct xdp_buff *xdp)
{
}
-static inline void xsk_buff_add_frag(struct xdp_buff *xdp)
+static inline bool xsk_buff_add_frag(struct xdp_buff *head,
+ struct xdp_buff *xdp)
{
+ return false;
}
static inline struct xdp_buff *xsk_buff_get_frag(const struct xdp_buff *first)
diff --git a/drivers/net/ethernet/intel/i40e/i40e_xsk.c b/drivers/net/ethernet/intel/i40e/i40e_xsk.c
index 4e885df789ef..e28f1905a4a0 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_xsk.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_xsk.c
@@ -395,32 +395,6 @@ static void i40e_handle_xdp_result_zc(struct i40e_ring *rx_ring,
WARN_ON_ONCE(1);
}
-static int
-i40e_add_xsk_frag(struct i40e_ring *rx_ring, struct xdp_buff *first,
- struct xdp_buff *xdp, const unsigned int size)
-{
- struct skb_shared_info *sinfo = xdp_get_shared_info_from_buff(first);
-
- if (!xdp_buff_has_frags(first)) {
- sinfo->nr_frags = 0;
- sinfo->xdp_frags_size = 0;
- xdp_buff_set_frags_flag(first);
- }
-
- if (unlikely(sinfo->nr_frags == MAX_SKB_FRAGS)) {
- xsk_buff_free(first);
- return -ENOMEM;
- }
-
- __skb_fill_page_desc_noacc(sinfo, sinfo->nr_frags++,
- virt_to_page(xdp->data_hard_start),
- XDP_PACKET_HEADROOM, size);
- sinfo->xdp_frags_size += size;
- xsk_buff_add_frag(xdp);
-
- return 0;
-}
-
/**
* i40e_clean_rx_irq_zc - Consumes Rx packets from the hardware ring
* @rx_ring: Rx ring
@@ -486,8 +460,10 @@ int i40e_clean_rx_irq_zc(struct i40e_ring *rx_ring, int budget)
if (!first)
first = bi;
- else if (i40e_add_xsk_frag(rx_ring, first, bi, size))
+ else if (!xsk_buff_add_frag(first, bi)) {
+ xsk_buff_free(first);
break;
+ }
if (++next_to_process == count)
next_to_process = 0;
diff --git a/drivers/net/ethernet/intel/ice/ice_xsk.c b/drivers/net/ethernet/intel/ice/ice_xsk.c
index 334ae945d640..8975d2971bc3 100644
--- a/drivers/net/ethernet/intel/ice/ice_xsk.c
+++ b/drivers/net/ethernet/intel/ice/ice_xsk.c
@@ -801,35 +801,6 @@ ice_run_xdp_zc(struct ice_rx_ring *rx_ring, struct xdp_buff *xdp,
return result;
}
-static int
-ice_add_xsk_frag(struct ice_rx_ring *rx_ring, struct xdp_buff *first,
- struct xdp_buff *xdp, const unsigned int size)
-{
- struct skb_shared_info *sinfo = xdp_get_shared_info_from_buff(first);
-
- if (!size)
- return 0;
-
- if (!xdp_buff_has_frags(first)) {
- sinfo->nr_frags = 0;
- sinfo->xdp_frags_size = 0;
- xdp_buff_set_frags_flag(first);
- }
-
- if (unlikely(sinfo->nr_frags == MAX_SKB_FRAGS)) {
- xsk_buff_free(first);
- return -ENOMEM;
- }
-
- __skb_fill_page_desc_noacc(sinfo, sinfo->nr_frags++,
- virt_to_page(xdp->data_hard_start),
- XDP_PACKET_HEADROOM, size);
- sinfo->xdp_frags_size += size;
- xsk_buff_add_frag(xdp);
-
- return 0;
-}
-
/**
* ice_clean_rx_irq_zc - consumes packets from the hardware ring
* @rx_ring: AF_XDP Rx ring
@@ -895,7 +866,8 @@ int ice_clean_rx_irq_zc(struct ice_rx_ring *rx_ring,
if (!first) {
first = xdp;
- } else if (ice_add_xsk_frag(rx_ring, first, xdp, size)) {
+ } else if (likely(size) && !xsk_buff_add_frag(first, xdp)) {
+ xsk_buff_free(first);
break;
}
--
2.47.0
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