From f2318196c71a78b40b645b6fd849609103f6dca7 Mon Sep 17 00:00:00 2001
From: Adrien Mazarguil <adrien.mazarguil@6wind.com>
Date: Fri, 1 Sep 2017 10:06:17 +0200
Subject: [PATCH] net/mlx4: remove limitation on number of instances

The seemingly artificial limitation on the maximum number of instances for
this PMD is an historical leftover that predates its first public release.

It was used as a workaround to support multiple physical ports on a PCI
device exposing a single bus address when mlx4 was implemented directly as
an Ethernet device driver instead of a PCI driver spawning Ethernet
devices.

Getting rid of it simplifies device initialization.

Signed-off-by: Adrien Mazarguil <adrien.mazarguil@6wind.com>
---
 drivers/net/mlx4/mlx4.c | 57 +++--------------------------------------
 1 file changed, 3 insertions(+), 54 deletions(-)

diff --git a/drivers/net/mlx4/mlx4.c b/drivers/net/mlx4/mlx4.c
index b5a7607d0d..0ae78e0a12 100644
--- a/drivers/net/mlx4/mlx4.c
+++ b/drivers/net/mlx4/mlx4.c
@@ -5444,40 +5444,6 @@ priv_get_mac(struct priv *priv, uint8_t (*mac)[ETHER_ADDR_LEN])
 	return 0;
 }
 
-/* Support up to 32 adapters. */
-static struct {
-	struct rte_pci_addr pci_addr; /* associated PCI address */
-	uint32_t ports; /* physical ports bitfield. */
-} mlx4_dev[32];
-
-/**
- * Get device index in mlx4_dev[] from PCI bus address.
- *
- * @param[in] pci_addr
- *   PCI bus address to look for.
- *
- * @return
- *   mlx4_dev[] index on success, -1 on failure.
- */
-static int
-mlx4_dev_idx(struct rte_pci_addr *pci_addr)
-{
-	unsigned int i;
-	int ret = -1;
-
-	assert(pci_addr != NULL);
-	for (i = 0; (i != elemof(mlx4_dev)); ++i) {
-		if ((mlx4_dev[i].pci_addr.domain == pci_addr->domain) &&
-		    (mlx4_dev[i].pci_addr.bus == pci_addr->bus) &&
-		    (mlx4_dev[i].pci_addr.devid == pci_addr->devid) &&
-		    (mlx4_dev[i].pci_addr.function == pci_addr->function))
-			return i;
-		if ((mlx4_dev[i].ports == 0) && (ret == -1))
-			ret = i;
-	}
-	return ret;
-}
-
 /**
  * Retrieve integer value from environment variable.
  *
@@ -6060,21 +6026,11 @@ mlx4_pci_probe(struct rte_pci_driver *pci_drv, struct rte_pci_device *pci_dev)
 		.active_ports = 0,
 	};
 	unsigned int vf;
-	int idx;
 	int i;
 
 	(void)pci_drv;
 	assert(pci_drv == &mlx4_driver);
-	/* Get mlx4_dev[] index. */
-	idx = mlx4_dev_idx(&pci_dev->addr);
-	if (idx == -1) {
-		ERROR("this driver cannot support any more adapters");
-		return -ENOMEM;
-	}
-	DEBUG("using driver device index %d", idx);
 
-	/* Save PCI address. */
-	mlx4_dev[idx].pci_addr = pci_dev->addr;
 	list = ibv_get_device_list(&i);
 	if (list == NULL) {
 		assert(errno);
@@ -6141,7 +6097,6 @@ mlx4_pci_probe(struct rte_pci_driver *pci_drv, struct rte_pci_device *pci_dev)
 	}
 	for (i = 0; i < device_attr.phys_port_cnt; i++) {
 		uint32_t port = i + 1; /* ports are indexed from one */
-		uint32_t test = (1 << i);
 		struct ibv_context *ctx = NULL;
 		struct ibv_port_attr port_attr;
 		struct ibv_pd *pd = NULL;
@@ -6162,7 +6117,7 @@ mlx4_pci_probe(struct rte_pci_driver *pci_drv, struct rte_pci_device *pci_dev)
 #endif /* RSS_SUPPORT */
 #endif /* HAVE_EXP_QUERY_DEVICE */
 
-		DEBUG("using port %u (%08" PRIx32 ")", port, test);
+		DEBUG("using port %u", port);
 
 		ctx = ibv_open_device(ibv_dev);
 		if (ctx == NULL) {
@@ -6198,8 +6153,6 @@ mlx4_pci_probe(struct rte_pci_driver *pci_drv, struct rte_pci_device *pci_dev)
 			goto port_error;
 		}
 
-		mlx4_dev[idx].ports |= test;
-
 		/* from rte_ethdev.c */
 		priv = rte_zmalloc("ethdev private structure",
 				   sizeof(*priv),
@@ -6405,6 +6358,8 @@ port_error:
 			rte_eth_dev_release_port(eth_dev);
 		break;
 	}
+	if (i == device_attr.phys_port_cnt)
+		return 0;
 
 	/*
 	 * XXX if something went wrong in the loop above, there is a resource
@@ -6413,12 +6368,6 @@ port_error:
 	 * way to enumerate the registered ethdevs to free the previous ones.
 	 */
 
-	/* no port found, complain */
-	if (!mlx4_dev[idx].ports) {
-		err = ENODEV;
-		goto error;
-	}
-
 error:
 	if (attr_ctx)
 		claim_zero(ibv_close_device(attr_ctx));
-- 
2.20.1