linux-kernel - [net-next PATCH v6 5/6] octeontx2-pf: Prepare for AF

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Message-ID: <20250212094738.2671725-6-sumang@marvell.com>
Date: Wed, 12 Feb 2025 15:17:37 +0530
From: Suman Ghosh <sumang@...vell.com>
To: <horms@...nel.org>, <sgoutham@...vell.com>, <gakula@...vell.com>,
        <sbhatta@...vell.com>, <hkelam@...vell.com>, <davem@...emloft.net>,
        <edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>,
        <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <lcherian@...vell.com>, <jerinj@...vell.com>,
        <john.fastabend@...il.com>, <bbhushan2@...vell.com>, <hawk@...nel.org>,
        <andrew+netdev@...n.ch>, <ast@...nel.org>, <daniel@...earbox.net>,
        <bpf@...r.kernel.org>, <larysa.zaremba@...el.com>
CC: Suman Ghosh <sumang@...vell.com>
Subject: [net-next PATCH v6 5/6] octeontx2-pf: Prepare for AF_XDP

Implement necessary APIs required for AF_XDP transmit.

Signed-off-by: Hariprasad Kelam <hkelam@...vell.com>
Signed-off-by: Suman Ghosh <sumang@...vell.com>
---
 .../marvell/octeontx2/nic/otx2_common.h       |  1 +
 .../marvell/octeontx2/nic/otx2_txrx.c         | 25 +++++++++++++++++--
 2 files changed, 24 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.h b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.h
index 60508971b62f..19e9e2e72233 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.h
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_common.h
@@ -1181,4 +1181,5 @@ static inline int mcam_entry_cmp(const void *a, const void *b)
 dma_addr_t otx2_dma_map_skb_frag(struct otx2_nic *pfvf,
 				 struct sk_buff *skb, int seg, int *len);
 void otx2_dma_unmap_skb_frags(struct otx2_nic *pfvf, struct sg_list *sg);
+int otx2_read_free_sqe(struct otx2_nic *pfvf, u16 qidx);
 #endif /* OTX2_COMMON_H */
diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_txrx.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_txrx.c
index 00b6903ba250..9a6c1f1a3ee0 100644
--- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_txrx.c
+++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_txrx.c
@@ -30,6 +30,12 @@
 
 DEFINE_STATIC_KEY_FALSE(cn10k_ipsec_sa_enabled);
 
+static int otx2_get_free_sqe(struct otx2_snd_queue *sq)
+{
+	return (sq->cons_head - sq->head - 1 + sq->sqe_cnt)
+		& (sq->sqe_cnt - 1);
+}
+
 static bool otx2_xdp_rcv_pkt_handler(struct otx2_nic *pfvf,
 				     struct bpf_prog *prog,
 				     struct nix_cqe_rx_s *cqe,
@@ -1157,7 +1163,7 @@ bool otx2_sq_append_skb(void *dev, struct netdev_queue *txq,
 	/* Check if there is enough room between producer
 	 * and consumer index.
 	 */
-	free_desc = (sq->cons_head - sq->head - 1 + sq->sqe_cnt) & (sq->sqe_cnt - 1);
+	free_desc = otx2_get_free_sqe(sq);
 	if (free_desc < sq->sqe_thresh)
 		return false;
 
@@ -1396,6 +1402,21 @@ static void otx2_xdp_sqe_add_sg(struct otx2_snd_queue *sq,
 	sq->sg[sq->head].skb = (u64)xdpf;
 }
 
+int otx2_read_free_sqe(struct otx2_nic *pfvf, u16 qidx)
+{
+	struct otx2_snd_queue *sq;
+	int free_sqe;
+
+	sq = &pfvf->qset.sq[qidx];
+	free_sqe = otx2_get_free_sqe(sq);
+	if (free_sqe < sq->sqe_thresh) {
+		netdev_warn(pfvf->netdev, "No free sqe for Send queue%d\n", qidx);
+		return 0;
+	}
+
+	return free_sqe - sq->sqe_thresh;
+}
+
 bool otx2_xdp_sq_append_pkt(struct otx2_nic *pfvf, struct xdp_frame *xdpf,
 			    u64 iova, int len, u16 qidx, u16 flags)
 {
@@ -1404,7 +1425,7 @@ bool otx2_xdp_sq_append_pkt(struct otx2_nic *pfvf, struct xdp_frame *xdpf,
 	int offset, free_sqe;
 
 	sq = &pfvf->qset.sq[qidx];
-	free_sqe = (sq->num_sqbs - *sq->aura_fc_addr) * sq->sqe_per_sqb;
+	free_sqe = otx2_get_free_sqe(sq);
 	if (free_sqe < sq->sqe_thresh)
 		return false;
 
-- 
2.25.1