Do not allocate multicast array memory in multicast filter

configuration function. For failed memory allocations, em(4)/lem(4)
called panic(9) which is not acceptable on production box.
igb(4)/ixgb(4)/ix(4) allocated the required memory in stack which
consumed 768 bytes of stack memory which looks too big.

To address these issues, allocate multicast array memory in device
attach time and make multicast configuration success under any
conditions. This change also removes the excessive use of memory in
stack.

Reviewed by:	jfv

6 files changed, 50 insertions, 17 deletions

diff --git a/sys/dev/e1000/if_em.c b/sys/dev/e1000/if_em.c
index 56859ea..e5dfa36 100644
--- a/sys/dev/e1000/if_em.c
+++ b/sys/dev/e1000/if_em.c
@@ -576,6 +576,15 @@ em_attach(device_t dev)
 		goto err_pci;
 	}
 
+	/* Allocate multicast array memory. */
+	adapter->mta = malloc(sizeof(u8) * ETH_ADDR_LEN *
+	    MAX_NUM_MULTICAST_ADDRESSES, M_DEVBUF, M_NOWAIT);
+	if (adapter->mta == NULL) {
+		device_printf(dev, "Can not allocate multicast setup array\n");
+		error = ENOMEM;
+		goto err_late;
+	}
+
 	/*
 	** Start from a known state, this is
 	** important in reading the nvm and
@@ -674,6 +683,7 @@ err_late:
 		if_free(adapter->ifp);
 err_pci:
 	em_free_pci_resources(adapter);
+	free(adapter->mta, M_DEVBUF);
 	EM_CORE_LOCK_DESTROY(adapter);
 
 	return (error);
@@ -739,6 +749,7 @@ em_detach(device_t dev)
 	em_free_receive_structures(adapter);
 
 	em_release_hw_control(adapter);
+	free(adapter->mta, M_DEVBUF);
 
 	return (0);
 }
@@ -1998,6 +2009,9 @@ em_set_multi(struct adapter *adapter)
 
 	IOCTL_DEBUGOUT("em_set_multi: begin");
 
+	mta = adapter->mta;
+	bzero(mta, sizeof(u8) * ETH_ADDR_LEN * MAX_NUM_MULTICAST_ADDRESSES);
+
 	if (adapter->hw.mac.type == e1000_82542 && 
 	    adapter->hw.revision_id == E1000_REVISION_2) {
 		reg_rctl = E1000_READ_REG(&adapter->hw, E1000_RCTL);
@@ -2008,13 +2022,6 @@ em_set_multi(struct adapter *adapter)
 		msec_delay(5);
 	}
 
-	/* Allocate temporary memory to setup array */
-	mta = malloc(sizeof(u8) *
-	    (ETH_ADDR_LEN * MAX_NUM_MULTICAST_ADDRESSES),
-	    M_DEVBUF, M_NOWAIT | M_ZERO);
-	if (mta == NULL)
-		panic("em_set_multi memory failure\n");
-
 #if __FreeBSD_version < 800000
 	IF_ADDR_LOCK(ifp);
 #else
@@ -2052,7 +2059,6 @@ em_set_multi(struct adapter *adapter)
 		if (adapter->hw.bus.pci_cmd_word & CMD_MEM_WRT_INVALIDATE)
 			e1000_pci_set_mwi(&adapter->hw);
 	}
-	free(mta, M_DEVBUF);
 }
 
 
diff --git a/sys/dev/e1000/if_em.h b/sys/dev/e1000/if_em.h
index 225a8d0..d164edb 100644
--- a/sys/dev/e1000/if_em.h
+++ b/sys/dev/e1000/if_em.h
@@ -391,6 +391,8 @@ struct adapter {
 	bool		has_manage;
 	bool		has_amt;
 
+	/* Multicast array memory */
+	u8		*mta;
 	/* Info about the board itself */
 	uint8_t		link_active;
 	uint16_t	link_speed;
diff --git a/sys/dev/e1000/if_igb.c b/sys/dev/e1000/if_igb.c
index d8371af..3e14f24 100644
--- a/sys/dev/e1000/if_igb.c
+++ b/sys/dev/e1000/if_igb.c
@@ -515,6 +515,15 @@ igb_attach(device_t dev)
 		goto err_late;
 	}
 
+	/* Allocate multicast array memory. */
+	adapter->mta = malloc(sizeof(u8) * ETH_ADDR_LEN *
+	    MAX_NUM_MULTICAST_ADDRESSES, M_DEVBUF, M_NOWAIT);
+	if (adapter->mta == NULL) {
+		device_printf(dev, "Can not allocate multicast setup array\n");
+		error = ENOMEM;
+		goto err_late;
+	}
+
 	/*
 	** Start from a known state, this is
 	** important in reading the nvm and
@@ -618,6 +627,7 @@ err_late:
 		if_free(adapter->ifp);
 err_pci:
 	igb_free_pci_resources(adapter);
+	free(adapter->mta, M_DEVBUF);
 	IGB_CORE_LOCK_DESTROY(adapter);
 
 	return (error);
@@ -688,6 +698,7 @@ igb_detach(device_t dev)
 
 	igb_free_transmit_structures(adapter);
 	igb_free_receive_structures(adapter);
+	free(adapter->mta, M_DEVBUF);
 
 	IGB_CORE_LOCK_DESTROY(adapter);
 
@@ -1861,12 +1872,16 @@ igb_set_multi(struct adapter *adapter)
 	struct ifnet	*ifp = adapter->ifp;
 	struct ifmultiaddr *ifma;
 	u32 reg_rctl = 0;
-	u8  mta[MAX_NUM_MULTICAST_ADDRESSES * ETH_ADDR_LEN];
+	u8  *mta;
 
 	int mcnt = 0;
 
 	IOCTL_DEBUGOUT("igb_set_multi: begin");
 
+	mta = adapter->mta;
+	bzero(mta, sizeof(uint8_t) * ETH_ADDR_LEN *
+	    MAX_NUM_MULTICAST_ADDRESSES);
+
 #if __FreeBSD_version < 800000
 	IF_ADDR_LOCK(ifp);
 #else
diff --git a/sys/dev/e1000/if_igb.h b/sys/dev/e1000/if_igb.h
index 4388e07..28f5d32 100644
--- a/sys/dev/e1000/if_igb.h
+++ b/sys/dev/e1000/if_igb.h
@@ -422,6 +422,8 @@ struct adapter {
 	u32			rx_mbuf_sz;
 	u32			rx_mask;
 
+	/* Multicast array memory */
+	u8		*mta;
 	/* Misc stats maintained by the driver */
 	unsigned long	dropped_pkts;
 	unsigned long	mbuf_defrag_failed;
diff --git a/sys/dev/e1000/if_lem.c b/sys/dev/e1000/if_lem.c
index f5c9e293..71a82e5 100644
--- a/sys/dev/e1000/if_lem.c
+++ b/sys/dev/e1000/if_lem.c
@@ -550,6 +550,15 @@ lem_attach(device_t dev)
 	adapter->rx_desc_base =
 	    (struct e1000_rx_desc *)adapter->rxdma.dma_vaddr;
 
+	/* Allocate multicast array memory. */
+	adapter->mta = malloc(sizeof(u8) * ETH_ADDR_LEN *
+	    MAX_NUM_MULTICAST_ADDRESSES, M_DEVBUF, M_NOWAIT);
+	if (adapter->mta == NULL) {
+		device_printf(dev, "Can not allocate multicast setup array\n");
+		error = ENOMEM;
+		goto err_hw_init;
+	}
+
 	/*
 	** Start from a known state, this is
 	** important in reading the nvm and
@@ -676,6 +685,7 @@ err_pci:
 	if (adapter->ifp != NULL)
 		if_free(adapter->ifp);
 	lem_free_pci_resources(adapter);
+	free(adapter->mta, M_DEVBUF);
 	EM_TX_LOCK_DESTROY(adapter);
 	EM_RX_LOCK_DESTROY(adapter);
 	EM_CORE_LOCK_DESTROY(adapter);
@@ -762,6 +772,7 @@ lem_detach(device_t dev)
 	}
 
 	lem_release_hw_control(adapter);
+	free(adapter->mta, M_DEVBUF);
 	EM_TX_LOCK_DESTROY(adapter);
 	EM_RX_LOCK_DESTROY(adapter);
 	EM_CORE_LOCK_DESTROY(adapter);
@@ -1942,6 +1953,9 @@ lem_set_multi(struct adapter *adapter)
 
 	IOCTL_DEBUGOUT("lem_set_multi: begin");
 
+	mta = adapter->mta;
+	bzero(mta, sizeof(u8) * ETH_ADDR_LEN * MAX_NUM_MULTICAST_ADDRESSES);
+
 	if (adapter->hw.mac.type == e1000_82542 && 
 	    adapter->hw.revision_id == E1000_REVISION_2) {
 		reg_rctl = E1000_READ_REG(&adapter->hw, E1000_RCTL);
@@ -1952,13 +1966,6 @@ lem_set_multi(struct adapter *adapter)
 		msec_delay(5);
 	}
 
-	/* Allocate temporary memory to setup array */
-	mta = malloc(sizeof(u8) *
-	    (ETH_ADDR_LEN * MAX_NUM_MULTICAST_ADDRESSES),
-	    M_DEVBUF, M_NOWAIT | M_ZERO);
-	if (mta == NULL)
-		panic("lem_set_multi memory failure\n");
-
 #if __FreeBSD_version < 800000
 	IF_ADDR_LOCK(ifp);
 #else
@@ -1996,7 +2003,6 @@ lem_set_multi(struct adapter *adapter)
 		if (adapter->hw.bus.pci_cmd_word & CMD_MEM_WRT_INVALIDATE)
 			e1000_pci_set_mwi(&adapter->hw);
 	}
-	free(mta, M_DEVBUF);
 }
 
 
diff --git a/sys/dev/e1000/if_lem.h b/sys/dev/e1000/if_lem.h
index 13c2cbc..0ada7df 100644
--- a/sys/dev/e1000/if_lem.h
+++ b/sys/dev/e1000/if_lem.h
@@ -339,6 +339,8 @@ struct adapter {
 	bool		has_manage;
 	bool		has_amt;
 
+	/* Multicast array memory */
+	u8		*mta;
 	/* Info about the board itself */
 	uint8_t		link_active;
 	uint16_t	link_speed;