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: Benjamin Li <benli@broadcom.com>
Reviewed-by: Matt Carlson <mcarlson@broadcom.com>
Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/bnx2.c b/drivers/net/bnx2.c
index deb7f83..d44ecc3 100644 (file)
--- 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 (file)
--- 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;