netdev - [PATCH net-next 2/4] bnx2: Call pci_enable_msix() with actual number of vectors.

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <1279584905-15084-2-git-send-email-mchan@broadcom.com>
Date:	Mon, 19 Jul 2010 17:15:03 -0700
From:	"Michael Chan" <mchan@...adcom.com>
To:	davem@...emloft.net
cc:	netdev@...r.kernel.org,
	Breno Leitão <leitao@...ux.vnet.ibm.com>
Subject: [PATCH net-next 2/4] bnx2: Call pci_enable_msix() with actual
 number of vectors.

Based on original patch by Breno Leitão <leitao@...ux.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@...ux.vnet.ibm.com>
Reviewed-by: Benjamin Li <benli@...adcom.com>
Reviewed-by: Matt Carlson <mcarlson@...adcom.com>
Signed-off-by: Michael Chan <mchan@...adcom.com>
---
 drivers/net/bnx2.c |   24 ++++++++++++++++++++----
 drivers/net/bnx2.h |    9 ++++++---
 2 files changed, 26 insertions(+), 7 deletions(-)

diff --git a/drivers/net/bnx2.c b/drivers/net/bnx2.c
index deb7f83..d44ecc3 100644
--- a/drivers/net/bnx2.c
+++ b/drivers/net/bnx2.c
@@ -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;
diff --git a/drivers/net/bnx2.h b/drivers/net/bnx2.h
index b9af6bc..2104c10 100644
--- a/drivers/net/bnx2.h
+++ b/drivers/net/bnx2.h
@@ -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;
-- 
1.6.4.GIT


--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html