[PATCH 5.10 09/54] xsk: Inherit need_wakeup flag for shared sockets

Greg Kroah-Hartman
2022-10-13T18:11:45Z

From: Jalal Mostafa <jalal.a.mostapha@gmail.com>

commit 60240bc26114543fcbfcd8a28466e67e77b20388 upstream.

The flag for need_wakeup is not set for xsks with `XDP_SHARED_UMEM`
flag and of different queue ids and/or devices. They should inherit
the flag from the first socket buffer pool since no flags can be
specified once `XDP_SHARED_UMEM` is specified.

Fixes: b5aea28dca134 ("xsk: Add shared umem support between queue ids")
Signed-off-by: Jalal Mostafa <jalal.a.mostapha@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Magnus Karlsson <magnus.karlsson@intel.com>
Link: https://lore.kernel.org/bpf/20220921135701.10199-1-jalal.a.mostapha@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
include/net/xsk_buff_pool.h | 2 +-
net/xdp/xsk.c | 4 ++--
net/xdp/xsk_buff_pool.c | 5 +++--
3 files changed, 6 insertions(+), 5 deletions(-)

--- a/include/net/xsk_buff_pool.h
+++ b/include/net/xsk_buff_pool.h
@@ -86,7 +86,7 @@ struct xsk_buff_pool *xp_create_and_assi
struct xdp_umem *umem);
int xp_assign_dev(struct xsk_buff_pool *pool, struct net_device *dev,
u16 queue_id, u16 flags);
-int xp_assign_dev_shared(struct xsk_buff_pool *pool, struct xdp_umem *umem,
+int xp_assign_dev_shared(struct xsk_buff_pool *pool, struct xdp_sock *umem_xs,
struct net_device *dev, u16 queue_id);
void xp_destroy(struct xsk_buff_pool *pool);
void xp_release(struct xdp_buff_xsk *xskb);
--- a/net/xdp/xsk.c
+++ b/net/xdp/xsk.c
@@ -742,8 +742,8 @@ static int xsk_bind(struct socket *sock,
goto out_unlock;
}

- err = xp_assign_dev_shared(xs->pool, umem_xs->umem,
- dev, qid);
+ err = xp_assign_dev_shared(xs->pool, umem_xs, dev,
+ qid);
if (err) {
xp_destroy(xs->pool);
xs->pool = NULL;
--- a/net/xdp/xsk_buff_pool.c
+++ b/net/xdp/xsk_buff_pool.c
@@ -198,17 +198,18 @@ int xp_assign_dev(struct xsk_buff_pool *
return __xp_assign_dev(pool, dev, queue_id, flags);
}

-int xp_assign_dev_shared(struct xsk_buff_pool *pool, struct xdp_umem *umem,
+int xp_assign_dev_shared(struct xsk_buff_pool *pool, struct xdp_sock *umem_xs,
struct net_device *dev, u16 queue_id)
{
u16 flags;
+ struct xdp_umem *umem = umem_xs->umem;

/* One fill and completion ring required for each queue id. */
if (!pool->fq || !pool->cq)
return -EINVAL;

flags = umem->zc ? XDP_ZEROCOPY : XDP_COPY;
- if (pool->uses_need_wakeup)
+ if (umem_xs->pool->uses_need_wakeup)
flags |= XDP_USE_NEED_WAKEUP;

return __xp_assign_dev(pool, dev, queue_id, flags);