linux-kernel - [PATCH bpf v3] xsk: inherit need

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Message-Id: <20220921135701.10199-1-jalal.a.mostapha@gmail.com>
Date:   Wed, 21 Sep 2022 13:57:01 +0000
From:   Jalal Mostafa <jalal.a.mostapha@...il.com>
To:     maciej.fijalkowski@...el.com, netdev@...r.kernel.org,
        bpf@...r.kernel.org
Cc:     bjorn@...nel.org, magnus.karlsson@...el.com,
        jonathan.lemon@...il.com, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, daniel@...earbox.net,
        john.fastabend@...il.com, hawk@...nel.org, ast@...nel.org,
        linux-kernel@...r.kernel.org, jalal.mostafa@....edu,
        jalal.a.mostapha@...il.com
Subject: [PATCH bpf v3] xsk: inherit need_wakeup flag for shared sockets

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@...il.com>
Acked-by: Magnus Karlsson <magnus.karlsson@...el.com>
---
 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(-)

diff --git a/include/net/xsk_buff_pool.h b/include/net/xsk_buff_pool.h
index 647722e847b4..f787c3f524b0 100644
--- a/include/net/xsk_buff_pool.h
+++ b/include/net/xsk_buff_pool.h
@@ -95,7 +95,7 @@ struct xsk_buff_pool *xp_create_and_assign_umem(struct xdp_sock *xs,
 						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);
 int xp_alloc_tx_descs(struct xsk_buff_pool *pool, struct xdp_sock *xs);
 void xp_destroy(struct xsk_buff_pool *pool);
diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c
index 5b4ce6ba1bc7..7bada4e8460b 100644
--- a/net/xdp/xsk.c
+++ b/net/xdp/xsk.c
@@ -954,8 +954,8 @@ static int xsk_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
 				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;
diff --git a/net/xdp/xsk_buff_pool.c b/net/xdp/xsk_buff_pool.c
index a71a8c6edf55..ed6c71826d31 100644
--- a/net/xdp/xsk_buff_pool.c
+++ b/net/xdp/xsk_buff_pool.c
@@ -212,17 +212,18 @@ int xp_assign_dev(struct xsk_buff_pool *pool,
 	return err;
 }
 
-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);
-- 
2.34.1