linux-toradex.git/drivers/net/virtio_net.c, branch v6.11

virtio_net: disable premapped mode by default

2024-09-10T16:01:06+00:00

Now, the premapped mode encounters some problem.

    http://lore.kernel.org/all/8b20cc28-45a9-4643-8e87-ba164a540c0a@oracle.com

So we disable the premapped mode by default.
We can re-enable it in the future.

Fixes: f9dac92ba908 ("virtio_ring: enable premapped mode whatever use_dma_api")
Reported-by: "Si-Wei Liu" 
Closes: http://lore.kernel.org/all/8b20cc28-45a9-4643-8e87-ba164a540c0a@oracle.com
Signed-off-by: Xuan Zhuo 
Acked-by: Michael S. Tsirkin 
Tested-by: Takero Funaki 
Link: https://patch.msgid.link/20240906123137.108741-4-xuanzhuo@linux.alibaba.com
Signed-off-by: Jakub Kicinski

Revert "virtio_net: big mode skip the unmap check"

2024-09-10T16:01:06+00:00

This reverts commit a377ae542d8d0a20a3173da3bbba72e045bea7a9.

Signed-off-by: Xuan Zhuo 
Acked-by: Michael S. Tsirkin 
Tested-by: Takero Funaki 
Link: https://patch.msgid.link/20240906123137.108741-3-xuanzhuo@linux.alibaba.com
Signed-off-by: Jakub Kicinski

Revert "virtio_net: rx remove premapped failover code"

2024-09-10T16:01:06+00:00

This reverts commit defd28aa5acb0fd7c15adc6bc40a8ac277d04dea.

Recover the code to disable premapped mode.

Signed-off-by: Xuan Zhuo 
Acked-by: Michael S. Tsirkin 
Tested-by: Takero Funaki 
Link: https://patch.msgid.link/20240906123137.108741-2-xuanzhuo@linux.alibaba.com
Signed-off-by: Jakub Kicinski

virtio_net: move netdev_tx_reset_queue() call before RX napi enable

2024-08-16T02:10:28+00:00

During suspend/resume the following BUG was hit:
------------[ cut here ]------------
kernel BUG at lib/dynamic_queue_limits.c:99!
Internal error: Oops - BUG: 0 [#1] SMP ARM
Modules linked in: bluetooth ecdh_generic ecc libaes
CPU: 1 PID: 1282 Comm: rtcwake Not tainted
6.10.0-rc3-00732-gc8bd1f7f3e61 #15240
Hardware name: Generic DT based system
PC is at dql_completed+0x270/0x2cc
LR is at __free_old_xmit+0x120/0x198
pc : []    lr : []    psr: 80000013
...
Flags: Nzcv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
Control: 10c5387d  Table: 43a4406a  DAC: 00000051
...
Process rtcwake (pid: 1282, stack limit = 0xfbc21278)
Stack: (0xe0805e80 to 0xe0806000)
...
Call trace:
  dql_completed from __free_old_xmit+0x120/0x198
  __free_old_xmit from free_old_xmit+0x44/0xe4
  free_old_xmit from virtnet_poll_tx+0x88/0x1b4
  virtnet_poll_tx from __napi_poll+0x2c/0x1d4
  __napi_poll from net_rx_action+0x140/0x2b4
  net_rx_action from handle_softirqs+0x11c/0x350
  handle_softirqs from call_with_stack+0x18/0x20
  call_with_stack from do_softirq+0x48/0x50
  do_softirq from __local_bh_enable_ip+0xa0/0xa4
  __local_bh_enable_ip from virtnet_open+0xd4/0x21c
  virtnet_open from virtnet_restore+0x94/0x120
  virtnet_restore from virtio_device_restore+0x110/0x1f4
  virtio_device_restore from dpm_run_callback+0x3c/0x100
  dpm_run_callback from device_resume+0x12c/0x2a8
  device_resume from dpm_resume+0x12c/0x1e0
  dpm_resume from dpm_resume_end+0xc/0x18
  dpm_resume_end from suspend_devices_and_enter+0x1f0/0x72c
  suspend_devices_and_enter from pm_suspend+0x270/0x2a0
  pm_suspend from state_store+0x68/0xc8
  state_store from kernfs_fop_write_iter+0x10c/0x1cc
  kernfs_fop_write_iter from vfs_write+0x2b0/0x3dc
  vfs_write from ksys_write+0x5c/0xd4
  ksys_write from ret_fast_syscall+0x0/0x54
Exception stack(0xe8bf1fa8 to 0xe8bf1ff0)
...
---[ end trace 0000000000000000 ]---

After virtnet_napi_enable() is called, the following path is hit:
  __napi_poll()
    -> virtnet_poll()
      -> virtnet_poll_cleantx()
        -> netif_tx_wake_queue()

That wakes the TX queue and allows skbs to be submitted and accounted by
BQL counters.

Then netdev_tx_reset_queue() is called that resets BQL counters and
eventually leads to the BUG in dql_completed().

Move virtnet_napi_tx_enable() what does BQL counters reset before RX
napi enable to avoid the issue.

Reported-by: Marek Szyprowski 
Closes: https://lore.kernel.org/netdev/e632e378-d019-4de7-8f13-07c572ab37a9@samsung.com/
Fixes: c8bd1f7f3e61 ("virtio_net: add support for Byte Queue Limits")
Tested-by: Marek Szyprowski 
Signed-off-by: Jiri Pirko 
Acked-by: Michael S. Tsirkin 
Acked-by: Jason Wang 
Link: https://patch.msgid.link/20240814122500.1710279-1-jiri@resnulli.us
Signed-off-by: Jakub Kicinski

virtio-net: unbreak vq resizing when coalescing is not negotiated

2024-08-05T10:10:22+00:00

Don't break the resize action if the vq coalescing feature
named VIRTIO_NET_F_VQ_NOTF_COAL is not negotiated.

Fixes: f61fe5f081cf ("virtio-net: fix the vq coalescing setting for vq resize")
Signed-off-by: Heng Qi 
Reviewed-by: Xuan Zhuo 
Acked-by: Eugenio Pé rez 
Acked-by: Jason Wang 
Signed-off-by: David S. Miller

virtio-net: check feature before configuring the vq coalescing command

2024-08-05T10:10:22+00:00

Virtio spec says:

	The driver MUST have negotiated the VIRTIO_NET_F_VQ_NOTF_COAL
	feature when issuing commands VIRTIO_NET_CTRL_NOTF_COAL_VQ_SET
	and VIRTIO_NET_CTRL_NOTF_COAL_VQ_GET.

So we add the feature negotiation check to
virtnet_send_{r,t}x_ctrl_coal_vq_cmd as a basis for the next bugfix patch.

Suggested-by: Michael S. Tsirkin 
Signed-off-by: Heng Qi 
Acked-by: Jason Wang 
Signed-off-by: David S. Miller

Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost

2024-07-19T18:57:55+00:00

Pull virtio updates from Michael Tsirkin:
 "Several new features here:

   - Virtio find vqs API has been reworked (required to fix the
     scalability issue we have with adminq, which I hope to merge later
     in the cycle)

   - vDPA driver for Marvell OCTEON

   - virtio fs performance improvement

   - mlx5 migration speedups

  Fixes, cleanups all over the place"

* tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost: (56 commits)
  virtio: rename virtio_find_vqs_info() to virtio_find_vqs()
  virtio: remove unused virtio_find_vqs() and virtio_find_vqs_ctx() helpers
  virtio: convert the rest virtio_find_vqs() users to virtio_find_vqs_info()
  virtio_balloon: convert to use virtio_find_vqs_info()
  virtiofs: convert to use virtio_find_vqs_info()
  scsi: virtio_scsi: convert to use virtio_find_vqs_info()
  virtio_net: convert to use virtio_find_vqs_info()
  virtio_crypto: convert to use virtio_find_vqs_info()
  virtio_console: convert to use virtio_find_vqs_info()
  virtio_blk: convert to use virtio_find_vqs_info()
  virtio: rename find_vqs_info() op to find_vqs()
  virtio: remove the original find_vqs() op
  virtio: call virtio_find_vqs_info() from virtio_find_single_vq() directly
  virtio: convert find_vqs() op implementations to find_vqs_info()
  virtio_pci: convert vp_*find_vqs() ops to find_vqs_info()
  virtio: introduce virtio_queue_info struct and find_vqs_info() config op
  virtio: make virtio_find_single_vq() call virtio_find_vqs()
  virtio: make virtio_find_vqs() call virtio_find_vqs_ctx()
  caif_virtio: use virtio_find_single_vq() for single virtqueue finding
  vdpa/mlx5: Don't enable non-active VQs in .set_vq_ready()
  ...

virtio: rename virtio_find_vqs_info() to virtio_find_vqs()

2024-07-17T09:20:58+00:00

Since the original virtio_find_vqs() is no longer present, rename
virtio_find_vqs_info() back to virtio_find_vqs().

Signed-off-by: Jiri Pirko 
Message-Id: <20240708074814.1739223-20-jiri@resnulli.us>
Signed-off-by: Michael S. Tsirkin

virtio_net: convert to use virtio_find_vqs_info()

2024-07-17T09:20:58+00:00

Instead of passing separate names and callbacks arrays
to virtio_find_vqs_ctx(), allocate one of virtual_queue_info structs
and pass it to virtio_find_vqs_info().

Suggested-by: Xuan Zhuo 
Signed-off-by: Jiri Pirko 
Message-Id: <20240708074814.1739223-14-jiri@resnulli.us>
Signed-off-by: Michael S. Tsirkin

virtio_net: Fix napi_skb_cache_put warning

2024-07-15T03:39:51+00:00

After the commit bdacf3e34945 ("net: Use nested-BH locking for
napi_alloc_cache.") was merged, the following warning began to appear:

	 WARNING: CPU: 5 PID: 1 at net/core/skbuff.c:1451 napi_skb_cache_put+0x82/0x4b0

	  __warn+0x12f/0x340
	  napi_skb_cache_put+0x82/0x4b0
	  napi_skb_cache_put+0x82/0x4b0
	  report_bug+0x165/0x370
	  handle_bug+0x3d/0x80
	  exc_invalid_op+0x1a/0x50
	  asm_exc_invalid_op+0x1a/0x20
	  __free_old_xmit+0x1c8/0x510
	  napi_skb_cache_put+0x82/0x4b0
	  __free_old_xmit+0x1c8/0x510
	  __free_old_xmit+0x1c8/0x510
	  __pfx___free_old_xmit+0x10/0x10

The issue arises because virtio is assuming it's running in NAPI context
even when it's not, such as in the netpoll case.

To resolve this, modify virtnet_poll_tx() to only set NAPI when budget
is available. Same for virtnet_poll_cleantx(), which always assumed that
it was in a NAPI context.

Fixes: df133f3f9625 ("virtio_net: bulk free tx skbs")
Suggested-by: Jakub Kicinski 
Signed-off-by: Breno Leitao 
Reviewed-by: Jakub Kicinski 
Acked-by: Michael S. Tsirkin 
Acked-by: Jason Wang 
Reviewed-by: Heng Qi 
Link: https://patch.msgid.link/20240712115325.54175-1-leitao@debian.org
Signed-off-by: Jakub Kicinski