[RFC,15/77] bnx2: Update MSI/MSI-X interrupts enablement code

Commit Message

Alexander Gordeev Oct. 2, 2013, 10:48 a.m. UTC

As result of recent re-design of the MSI/MSI-X interrupts enabling
pattern this driver has to be updated to use the new technique to
obtain a optimal number of MSI/MSI-X interrupts required.

Signed-off-by: Alexander Gordeev <[e-mail]>
---
 drivers/net/ethernet/broadcom/bnx2.c |   27 ++++++++++++++-------------
 1 files changed, 14 insertions(+), 13 deletions(-)

Patch

diff --git a/drivers/net/ethernet/broadcom/bnx2.c b/drivers/net/ethernet/broadcom/bnx2.c
index e838a3f..c902627 100644
--- a/drivers/net/ethernet/broadcom/bnx2.c
+++ b/drivers/net/ethernet/broadcom/bnx2.c
@@ -6202,25 +6202,26 @@  bnx2_enable_msix(struct bnx2 *bp, int msix_vecs)
 	 *  is setup properly */
 	BNX2_RD(bp, BNX2_PCI_MSIX_CONTROL);
 
-	for (i = 0; i < BNX2_MAX_MSIX_VEC; i++) {
-		msix_ent[i].entry = i;
-		msix_ent[i].vector = 0;
-	}
-
 	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;
+	rc = pci_msix_table_size(bp->pdev);
+	if (rc < 0)
+		return;
+
+	total_vecs = min(total_vecs, rc);
+	if (total_vecs < BNX2_MIN_MSIX_VEC)
+		return;
+
+	BUG_ON(total_vecs > ARRAY_SIZE(msix_ent));
+	for (i = 0; i < total_vecs; i++) {
+		msix_ent[i].entry = i;
+		msix_ent[i].vector = 0;
 	}
 
-	if (rc != 0)
+	rc = pci_enable_msix(bp->pdev, msix_ent, total_vecs);
+	if (rc)
 		return;
 
 	msix_vecs = total_vecs;