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Commit 379b39a2 authored by Michael Chan's avatar Michael Chan Committed by David S. Miller
Browse files

bnx2: Call pci_enable_msix() with actual number of vectors. 



Based on original patch by Breno Leitão <leitao@linux.vnet.ibm.com>.

Allocate the actual number of vectors and make use of fewer vectors
if pci_enable_msix() returns > 0.  We must allocate one additional
vector for the cnic driver.

Cc: Breno Leitão <leitao@linux.vnet.ibm.com>
Reviewed-by: default avatarBenjamin Li <benli@broadcom.com>
Reviewed-by: default avatarMatt Carlson <mcarlson@broadcom.com>
Signed-off-by: default avatarMichael Chan <mchan@broadcom.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 6fdae995

drivers/net/bnx2.c

+20 −4
Original line number Diff line number Diff line
@@ -864,7 +864,7 @@ bnx2_alloc_mem(struct bnx2 *bp) 
	bnapi->hw_rx_cons_ptr =

		&bnapi->status_blk.msi->status_rx_quick_consumer_index0;

	if (bp->flags & BNX2_FLAG_MSIX_CAP) {

		for (i = 1; i < BNX2_MAX_MSIX_VEC; i++) {

		for (i = 1; i < bp->irq_nvecs; i++) {

			struct status_block_msix *sblk;



			bnapi = &bp->bnx2_napi[i];
@@ -6152,7 +6152,7 @@ bnx2_free_irq(struct bnx2 *bp) 
static void

bnx2_enable_msix(struct bnx2 *bp, int msix_vecs)

{

	int i, rc;

	int i, total_vecs, rc;

	struct msix_entry msix_ent[BNX2_MAX_MSIX_VEC];

	struct net_device *dev = bp->dev;

	const int len = sizeof(bp->irq_tbl[0].name);
@@ -6171,13 +6171,29 @@ bnx2_enable_msix(struct bnx2 *bp, int msix_vecs) 
		msix_ent[i].vector = 0;

	}



	rc = pci_enable_msix(bp->pdev, msix_ent, BNX2_MAX_MSIX_VEC);

	total_vecs = msix_vecs;

#ifdef BCM_CNIC

	total_vecs++;

#endif

	rc = -ENOSPC;

	while (total_vecs >= BNX2_MIN_MSIX_VEC) {

		rc = pci_enable_msix(bp->pdev, msix_ent, total_vecs);

		if (rc <= 0)

			break;

		if (rc > 0)

			total_vecs = rc;

	}



	if (rc != 0)

		return;



	msix_vecs = total_vecs;

#ifdef BCM_CNIC

	msix_vecs--;

#endif

	bp->irq_nvecs = msix_vecs;

	bp->flags |= BNX2_FLAG_USING_MSIX | BNX2_FLAG_ONE_SHOT_MSI;

	for (i = 0; i < BNX2_MAX_MSIX_VEC; i++) {

	for (i = 0; i < total_vecs; i++) {

		bp->irq_tbl[i].vector = msix_ent[i].vector;

		snprintf(bp->irq_tbl[i].name, len, "%s-%d", dev->name, i);

		bp->irq_tbl[i].handler = bnx2_msi_1shot;

drivers/net/bnx2.h

+6 −3
Original line number Diff line number Diff line
@@ -6637,9 +6637,12 @@ struct flash_spec { 


#define BNX2_MAX_MSIX_HW_VEC	9

#define BNX2_MAX_MSIX_VEC	9

#define BNX2_BASE_VEC		0

#define BNX2_TX_VEC		1

#define BNX2_TX_INT_NUM	(BNX2_TX_VEC << BNX2_PCICFG_INT_ACK_CMD_INT_NUM_SHIFT)

#ifdef BCM_CNIC

#define BNX2_MIN_MSIX_VEC	2

#else

#define BNX2_MIN_MSIX_VEC	1

#endif





struct bnx2_irq {

	irq_handler_t	handler;