net/cxgbe: fix secondary process initialization

Attach to rte_eth_dev devices allocated by Primary process for
Ports other than Port-0 in the secondary process.

Save the Primary rte_eth_dev device eth_dev_data as part of txq
structure needed for tx path.

Fixes: 8318984927 ("cxgbe: add pmd skeleton")
Cc: stable@dpdk.org

Signed-off-by: Kumar Sanghvi <kumaras@chelsio.com>
Signed-off-by: Rahul Lakkireddy <rahul.lakkireddy@chelsio.com>

doc/guides/nics/features/cxgbe.ini

@@ -24,6 +24,7 @@ Basic stats          = Y
 Stats per queue      = Y
 EEPROM dump          = Y
 Registers dump       = Y
+Multiprocess aware   = Y
 BSD nic_uio          = Y
 Linux UIO            = Y
 Linux VFIO           = Y

drivers/net/cxgbe/base/adapter.h

@@ -267,6 +267,7 @@ struct sge_eth_tx_stats {	/* Ethernet tx queue statistics */
 struct sge_eth_txq {                   /* state for an SGE Ethernet Tx queue */
 	struct sge_txq q;
 	struct rte_eth_dev *eth_dev;   /* port that this queue belongs to */
+	struct rte_eth_dev_data *data;
 	struct sge_eth_tx_stats stats; /* queue statistics */
 	rte_spinlock_t txq_lock;
 

drivers/net/cxgbe/cxgbe_ethdev.c

@@ -1004,15 +1004,34 @@ static int eth_cxgbe_dev_init(struct rte_eth_dev *eth_dev)
 	eth_dev->dev_ops = &cxgbe_eth_dev_ops;
 	eth_dev->rx_pkt_burst = &cxgbe_recv_pkts;
 	eth_dev->tx_pkt_burst = &cxgbe_xmit_pkts;
-
-	/* for secondary processes, we don't initialise any further as primary
-	 * has already done this work.
-	 */
-	if (rte_eal_process_type() != RTE_PROC_PRIMARY)
-		return 0;
-
 	pci_dev = RTE_ETH_DEV_TO_PCI(eth_dev);
 
+	/* for secondary processes, we attach to ethdevs allocated by primary
+	 * and do minimal initialization.
+	 */
+	if (rte_eal_process_type() != RTE_PROC_PRIMARY) {
+		int i;
+
+		for (i = 1; i < MAX_NPORTS; i++) {
+			struct rte_eth_dev *rest_eth_dev;
+			char namei[RTE_ETH_NAME_MAX_LEN];
+
+			snprintf(namei, sizeof(namei), "%s_%d",
+				 pci_dev->device.name, i);
+			rest_eth_dev = rte_eth_dev_attach_secondary(namei);
+			if (rest_eth_dev) {
+				rest_eth_dev->device = &pci_dev->device;
+				rest_eth_dev->dev_ops =
+					eth_dev->dev_ops;
+				rest_eth_dev->rx_pkt_burst =
+					eth_dev->rx_pkt_burst;
+				rest_eth_dev->tx_pkt_burst =
+					eth_dev->tx_pkt_burst;
+			}
+		}
+		return 0;
+	}
+
 	snprintf(name, sizeof(name), "cxgbeadapter%d", eth_dev->data->port_id);
 	adapter = rte_zmalloc(name, sizeof(*adapter), 0);
 	if (!adapter)

drivers/net/cxgbe/sge.c

@@ -1095,7 +1095,7 @@ int t4_eth_xmit(struct sge_eth_txq *txq, struct rte_mbuf *mbuf,
 	u32 wr_mid;
 	u64 cntrl, *end;
 	bool v6;
-	u32 max_pkt_len = txq->eth_dev->data->dev_conf.rxmode.max_rx_pkt_len;
+	u32 max_pkt_len = txq->data->dev_conf.rxmode.max_rx_pkt_len;
 
 	/* Reject xmit if queue is stopped */
 	if (unlikely(txq->flags & EQ_STOPPED))
@@ -1115,7 +1115,7 @@ int t4_eth_xmit(struct sge_eth_txq *txq, struct rte_mbuf *mbuf,
 	    (unlikely(m->pkt_len > max_pkt_len)))
 		goto out_free;
 
-	pi = (struct port_info *)txq->eth_dev->data->dev_private;
+	pi = (struct port_info *)txq->data->dev_private;
 	adap = pi->adapter;
 
 	cntrl = F_TXPKT_L4CSUM_DIS | F_TXPKT_IPCSUM_DIS;
@@ -1997,6 +1997,7 @@ int t4_sge_alloc_eth_txq(struct adapter *adap, struct sge_eth_txq *txq,
 	txq->stats.mapping_err = 0;
 	txq->flags |= EQ_STOPPED;
 	txq->eth_dev = eth_dev;
+	txq->data = eth_dev->data;
 	t4_os_lock_init(&txq->txq_lock);
 	return 0;
 }