netdev - [PATCH net-next v3 6/9] xsk: extend xskq_cons_read_desc_batch to count nb

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Message-Id: <20251021131209.41491-7-kerneljasonxing@gmail.com>
Date: Tue, 21 Oct 2025 21:12:06 +0800
From: Jason Xing <kerneljasonxing@...il.com>
To: davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	bjorn@...nel.org,
	magnus.karlsson@...el.com,
	maciej.fijalkowski@...el.com,
	jonathan.lemon@...il.com,
	sdf@...ichev.me,
	ast@...nel.org,
	daniel@...earbox.net,
	hawk@...nel.org,
	john.fastabend@...il.com,
	joe@...a.to,
	willemdebruijn.kernel@...il.com
Cc: bpf@...r.kernel.org,
	netdev@...r.kernel.org,
	Jason Xing <kernelxing@...cent.com>
Subject: [PATCH net-next v3 6/9] xsk: extend xskq_cons_read_desc_batch to count nb_pkts

From: Jason Xing <kernelxing@...cent.com>

Add a new parameter nb_pkts to count how many packets are needed
practically by copy mode with the help of XDP_PKT_CONTD option.

Add descs to provide a way to pass xs->desc_cache to store the
descriptors for copy mode.

Signed-off-by: Jason Xing <kernelxing@...cent.com>
---
 net/xdp/xsk.c       | 3 ++-
 net/xdp/xsk_queue.h | 5 +++--
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c
index b057d10fcf6a..d30090a8420f 100644
--- a/net/xdp/xsk.c
+++ b/net/xdp/xsk.c
@@ -523,7 +523,8 @@ u32 xsk_tx_peek_release_desc_batch(struct xsk_buff_pool *pool, u32 nb_descs)
 	if (!nb_descs)
 		goto out;
 
-	nb_descs = xskq_cons_read_desc_batch(xs->tx, pool, nb_descs);
+	nb_descs = xskq_cons_read_desc_batch(xs->tx, pool, pool->tx_descs,
+					     nb_descs, NULL);
 	if (!nb_descs) {
 		xs->tx->queue_empty_descs++;
 		goto out;
diff --git a/net/xdp/xsk_queue.h b/net/xdp/xsk_queue.h
index f16f390370dc..9caa0cfe29de 100644
--- a/net/xdp/xsk_queue.h
+++ b/net/xdp/xsk_queue.h
@@ -235,10 +235,9 @@ static inline void parse_desc(struct xsk_queue *q, struct xsk_buff_pool *pool,
 
 static inline
 u32 xskq_cons_read_desc_batch(struct xsk_queue *q, struct xsk_buff_pool *pool,
-			      u32 max)
+			      struct xdp_desc *descs, u32 max, u32 *nb_pkts)
 {
 	u32 cached_cons = q->cached_cons, nb_entries = 0;
-	struct xdp_desc *descs = pool->tx_descs;
 	u32 total_descs = 0, nr_frags = 0;
 
 	/* track first entry, if stumble upon *any* invalid descriptor, rewind
@@ -258,6 +257,8 @@ u32 xskq_cons_read_desc_batch(struct xsk_queue *q, struct xsk_buff_pool *pool,
 		if (likely(!parsed.mb)) {
 			total_descs += (nr_frags + 1);
 			nr_frags = 0;
+			if (nb_pkts)
+				(*nb_pkts)++;
 		} else {
 			nr_frags++;
 			if (nr_frags == pool->xdp_zc_max_segs) {
-- 
2.41.3