Re: [PATCH bpf-next V4] xsk: allow remap of fill and/or completion rings

On Fri, 24 Mar 2023 at 13:22, Maciej Fijalkowski
[off-list ref] wrote:

On Fri, Mar 24, 2023 at 10:02:22AM +0000, Nuno Gonçalves wrote:

quoted

The remap of fill and completion rings was frowned upon as they
control the usage of UMEM which does not support concurrent use.
At the same time this would disallow the remap of these rings
into another process.

A possible use case is that the user wants to transfer the socket/
UMEM ownership to another process (via SYS_pidfd_getfd) and so
would need to also remap these rings.

This will have no impact on current usages and just relaxes the
remap limitation.

Signed-off-by: Nuno Gonçalves <redacted>
---
V3 -> V4: Remove undesired format changes
V2 -> V3: Call READ_ONCE for each variable and not for the ternary operator
V1 -> V2: Format and comment changes

thanks, it now looks good to me, i applied this locally and it builds, so:
Reviewed-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>

but i am giving a last call to Magnus since he was acking this before.

I have already acked it, but I can do it twice.
Acked-by: Magnus Karlsson <magnus.karlsson@intel.com>

quoted

 net/xdp/xsk.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c
index 2ac58b282b5eb..cc1e7f15fa731 100644
--- a/net/xdp/xsk.c
+++ b/net/xdp/xsk.c

@@ -1301,9 +1301,10 @@ static int xsk_mmap(struct file *file, struct socket *sock,
      loff_t offset = (loff_t)vma->vm_pgoff << PAGE_SHIFT;
      unsigned long size = vma->vm_end - vma->vm_start;
      struct xdp_sock *xs = xdp_sk(sock->sk);
+     int state = READ_ONCE(xs->state);
      struct xsk_queue *q = NULL;

-     if (READ_ONCE(xs->state) != XSK_READY)
+     if (state != XSK_READY && state != XSK_BOUND)
              return -EBUSY;

      if (offset == XDP_PGOFF_RX_RING) {

@@ -1314,9 +1315,11 @@ static int xsk_mmap(struct file *file, struct socket *sock,
              /* Matches the smp_wmb() in XDP_UMEM_REG */
              smp_rmb();
              if (offset == XDP_UMEM_PGOFF_FILL_RING)
-                     q = READ_ONCE(xs->fq_tmp);
+                     q = state == XSK_READY ? READ_ONCE(xs->fq_tmp) :
+                                              READ_ONCE(xs->pool->fq);
              else if (offset == XDP_UMEM_PGOFF_COMPLETION_RING)
-                     q = READ_ONCE(xs->cq_tmp);
+                     q = state == XSK_READY ? READ_ONCE(xs->cq_tmp) :
+                                              READ_ONCE(xs->pool->cq);
      }

      if (!q)
--

2.40.0