linux-kernel - [PATCH net-next 2/3] octeon_ep: implement xmit

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Message-ID: <20231023114449.2362147-3-srasheed@marvell.com>
Date:   Mon, 23 Oct 2023 04:44:47 -0700
From:   Shinas Rasheed <srasheed@...vell.com>
To:     <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
CC:     <hgani@...vell.com>, <vimleshk@...vell.com>, <egallen@...hat.com>,
        <mschmidt@...hat.com>, <pabeni@...hat.com>, <horms@...nel.org>,
        <kuba@...nel.org>, <davem@...emloft.net>,
        Shinas Rasheed <srasheed@...vell.com>,
        Veerasenareddy Burru <vburru@...vell.com>,
        "Sathesh Edara" <sedara@...vell.com>,
        Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH net-next 2/3] octeon_ep: implement xmit_more in transmit

Adds xmit_more handling in tx datapath for octeon_ep pf.

Signed-off-by: Shinas Rasheed <srasheed@...vell.com>
---
 .../ethernet/marvell/octeon_ep/octep_config.h |  2 +-
 .../ethernet/marvell/octeon_ep/octep_main.c   | 19 +++++++++++++++----
 2 files changed, 16 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/marvell/octeon_ep/octep_config.h b/drivers/net/ethernet/marvell/octeon_ep/octep_config.h
index 1622a6ebf036..ed8b1ace56b9 100644
--- a/drivers/net/ethernet/marvell/octeon_ep/octep_config.h
+++ b/drivers/net/ethernet/marvell/octeon_ep/octep_config.h
@@ -15,7 +15,7 @@
 /* Tx Queue: maximum descriptors per ring */
 #define OCTEP_IQ_MAX_DESCRIPTORS    1024
 /* Minimum input (Tx) requests to be enqueued to ring doorbell */
-#define OCTEP_DB_MIN                1
+#define OCTEP_DB_MIN                8
 /* Packet threshold for Tx queue interrupt */
 #define OCTEP_IQ_INTR_THRESHOLD     0x0
 
diff --git a/drivers/net/ethernet/marvell/octeon_ep/octep_main.c b/drivers/net/ethernet/marvell/octeon_ep/octep_main.c
index bf1e376a4232..730443ba2f5b 100644
--- a/drivers/net/ethernet/marvell/octeon_ep/octep_main.c
+++ b/drivers/net/ethernet/marvell/octeon_ep/octep_main.c
@@ -818,6 +818,7 @@ static netdev_tx_t octep_start_xmit(struct sk_buff *skb,
 	struct octep_iq *iq;
 	skb_frag_t *frag;
 	u16 nr_frags, si;
+	int xmit_more;
 	u16 q_no, wi;
 
 	q_no = skb_get_queue_mapping(skb);
@@ -892,18 +893,28 @@ static netdev_tx_t octep_start_xmit(struct sk_buff *skb,
 	}
 
 	netdev_tx_sent_queue(iq->netdev_q, skb->len);
+
+	xmit_more = netdev_xmit_more();
+
 	skb_tx_timestamp(skb);
 	atomic_inc(&iq->instr_pending);
+	iq->fill_cnt++;
 	wi++;
 	if (wi == iq->max_count)
 		wi = 0;
 	iq->host_write_index = wi;
+	if (xmit_more &&
+	    (atomic_read(&iq->instr_pending) <
+	     (iq->max_count - OCTEP_WAKE_QUEUE_THRESHOLD)) &&
+	    iq->fill_cnt < iq->fill_threshold)
+		return NETDEV_TX_OK;
+
 	/* Flush the hw descriptor before writing to doorbell */
 	wmb();
-
-	/* Ring Doorbell to notify the NIC there is a new packet */
-	writel(1, iq->doorbell_reg);
-	iq->stats.instr_posted++;
+	/* Ring Doorbell to notify the NIC of new packets */
+	writel(iq->fill_cnt, iq->doorbell_reg);
+	iq->stats.instr_posted += iq->fill_cnt;
+	iq->fill_cnt = 0;
 	return NETDEV_TX_OK;
 
 dma_map_sg_err:
-- 
2.25.1