Thread (48 messages) 48 messages, 8 authors, 2014-02-11

Re: [PATCH 02/34] bnx2x: Use pci_enable_msix_range()

From: Sergei Shtylyov <hidden>
Date: 2014-01-31 18:11:51
Also in: linux-pci, lkml

Hello.

On 01/31/2014 06:08 PM, Alexander Gordeev wrote:
As result of deprecation of MSI-X/MSI enablement functions
pci_enable_msix() and pci_enable_msi_block() all drivers
using these two interfaces need to be updated to use the
new pci_enable_msi_range() and pci_enable_msix_range()
interfaces.
Signed-off-by: Alexander Gordeev <redacted>
---
  drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c |   48 ++++++++++-------------
  1 files changed, 21 insertions(+), 27 deletions(-)
quoted hunk ↗ jump to hunk
diff --git a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
index 9d7419e..b396d74 100644
--- a/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
+++ b/drivers/net/ethernet/broadcom/bnx2x/bnx2x_cmn.c
@@ -1638,24 +1638,36 @@ int bnx2x_enable_msix(struct bnx2x *bp)
  	DP(BNX2X_MSG_SP, "about to request enable msix with %d vectors\n",
  	   msix_vec);

-	rc = pci_enable_msix(bp->pdev, &bp->msix_table[0], msix_vec);
-
+	rc = pci_enable_msix_range(bp->pdev, &bp->msix_table[0],
+				   BNX2X_MIN_MSIX_VEC_CNT(bp), msix_vec);
  	/*
  	 * reconfigure number of tx/rx queues according to available
  	 * MSI-X vectors
  	 */
-	if (rc >= BNX2X_MIN_MSIX_VEC_CNT(bp)) {
+	if (rc < 0) {
+		BNX2X_DEV_INFO("MSI-X is not attainable rc %d\n", rc);
+		goto no_msix;
+	} else if (rc == -ENOSPC) {
    This branch is unreachable now. You should have put this check first.
+		/* Get by with single vector */
+		rc = pci_enable_msix_range(bp->pdev, &bp->msix_table[0], 1, 1);
+		if (rc < 0) {
+			BNX2X_DEV_INFO("Single MSI-X is not attainable rc %d\n",
+				       rc);
+			goto no_msix;
+		}
+
+		BNX2X_DEV_INFO("Using single MSI-X vector\n");
+		bp->flags |= USING_SINGLE_MSIX_FLAG;
+
+		BNX2X_DEV_INFO("set number of queues to 1\n");
+		bp->num_ethernet_queues = 1;
+		bp->num_queues = bp->num_ethernet_queues + bp->num_cnic_queues;
+	} else if (rc < msix_vec) {
WBR, Sergei
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