Patch "vmxnet3: fix minimum vectors alloc issue" has been added to the 5.15-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    vmxnet3: fix minimum vectors alloc issue

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     vmxnet3-fix-minimum-vectors-alloc-issue.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit fb4dd00ad47f2a62f94d5dee969e2c2a4be5f699
Author: Ronak Doshi <doshir@xxxxxxxxxx>
Date:   Tue Dec 7 00:17:37 2021 -0800

    vmxnet3: fix minimum vectors alloc issue
    
    [ Upstream commit f71ef02f1a4a3c49962fa341ad8de19071f0f9bf ]
    
    'Commit 39f9895a00f4 ("vmxnet3: add support for 32 Tx/Rx queues")'
    added support for 32Tx/Rx queues. Within that patch, value of
    VMXNET3_LINUX_MIN_MSIX_VECT was updated.
    
    However, there is a case (numvcpus = 2) which actually requires 3
    intrs which matches VMXNET3_LINUX_MIN_MSIX_VECT which then is
    treated as failure by stack to allocate more vectors. This patch
    fixes this issue.
    
    Fixes: 39f9895a00f4 ("vmxnet3: add support for 32 Tx/Rx queues")
    Signed-off-by: Ronak Doshi <doshir@xxxxxxxxxx>
    Acked-by: Guolin Yang <gyang@xxxxxxxxxx>
    Link: https://lore.kernel.org/r/20211207081737.14000-1-doshir@xxxxxxxxxx
    Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/net/vmxnet3/vmxnet3_drv.c b/drivers/net/vmxnet3/vmxnet3_drv.c
index 8799854bacb29..5b0215b7c1761 100644
--- a/drivers/net/vmxnet3/vmxnet3_drv.c
+++ b/drivers/net/vmxnet3/vmxnet3_drv.c
@@ -3261,7 +3261,7 @@ vmxnet3_alloc_intr_resources(struct vmxnet3_adapter *adapter)
 
 #ifdef CONFIG_PCI_MSI
 	if (adapter->intr.type == VMXNET3_IT_MSIX) {
-		int i, nvec;
+		int i, nvec, nvec_allocated;
 
 		nvec  = adapter->share_intr == VMXNET3_INTR_TXSHARE ?
 			1 : adapter->num_tx_queues;
@@ -3274,14 +3274,15 @@ vmxnet3_alloc_intr_resources(struct vmxnet3_adapter *adapter)
 		for (i = 0; i < nvec; i++)
 			adapter->intr.msix_entries[i].entry = i;
 
-		nvec = vmxnet3_acquire_msix_vectors(adapter, nvec);
-		if (nvec < 0)
+		nvec_allocated = vmxnet3_acquire_msix_vectors(adapter, nvec);
+		if (nvec_allocated < 0)
 			goto msix_err;
 
 		/* If we cannot allocate one MSIx vector per queue
 		 * then limit the number of rx queues to 1
 		 */
-		if (nvec == VMXNET3_LINUX_MIN_MSIX_VECT) {
+		if (nvec_allocated == VMXNET3_LINUX_MIN_MSIX_VECT &&
+		    nvec != VMXNET3_LINUX_MIN_MSIX_VECT) {
 			if (adapter->share_intr != VMXNET3_INTR_BUDDYSHARE
 			    || adapter->num_rx_queues != 1) {
 				adapter->share_intr = VMXNET3_INTR_TXSHARE;
@@ -3291,14 +3292,14 @@ vmxnet3_alloc_intr_resources(struct vmxnet3_adapter *adapter)
 			}
 		}
 
-		adapter->intr.num_intrs = nvec;
+		adapter->intr.num_intrs = nvec_allocated;
 		return;
 
 msix_err:
 		/* If we cannot allocate MSIx vectors use only one rx queue */
 		dev_info(&adapter->pdev->dev,
 			 "Failed to enable MSI-X, error %d. "
-			 "Limiting #rx queues to 1, try MSI.\n", nvec);
+			 "Limiting #rx queues to 1, try MSI.\n", nvec_allocated);
 
 		adapter->intr.type = VMXNET3_IT_MSI;
 	}