Userspace applications indicate their multi-buffer capability to xsk
using XSK_USE_SG socket bind flag. For sockets using shared umem the
bind flag may contain XSK_USE_SG only for the first socket. For any
subsequent socket the only option supported is XDP_SHARED_UMEM.
Add option XDP_UMEM_SG_FLAG in umem config flags to store the
multi-buffer handling capability when indicated by XSK_USE_SG option in
bing flag by the first socket. Use this to derive multi-buffer capability
for subsequent sockets in xsk core.
Signed-off-by: Tirthendu Sarkar <tirthendu.sarkar@xxxxxxxxx>
Fixes: 81470b5c3c66 ("xsk: introduce XSK_USE_SG bind flag for xsk socket")
---
include/net/xdp_sock.h | 2 ++
net/xdp/xsk.c | 2 +-
net/xdp/xsk_buff_pool.c | 3 +++
3 files changed, 6 insertions(+), 1 deletion(-)
diff --git a/include/net/xdp_sock.h b/include/net/xdp_sock.h
index 1617af380162..69b472604b86 100644
--- a/include/net/xdp_sock.h
+++ b/include/net/xdp_sock.h
@@ -14,6 +14,8 @@
#include <linux/mm.h>
#include <net/sock.h>
+#define XDP_UMEM_SG_FLAG (1 << 1)
+
struct net_device;
struct xsk_queue;
struct xdp_buff;
diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c
index 55f8b9b0e06d..7482d0aca504 100644
--- a/net/xdp/xsk.c
+++ b/net/xdp/xsk.c
@@ -1228,7 +1228,7 @@ static int xsk_bind(struct socket *sock, struct sockaddr *addr, int addr_len)
xs->dev = dev;
xs->zc = xs->umem->zc;
- xs->sg = !!(flags & XDP_USE_SG);
+ xs->sg = !!(xs->umem->flags & XDP_UMEM_SG_FLAG);
xs->queue_id = qid;
xp_add_xsk(xs->pool, xs);
diff --git a/net/xdp/xsk_buff_pool.c b/net/xdp/xsk_buff_pool.c
index b3f7b310811e..49cb9f9a09be 100644
--- a/net/xdp/xsk_buff_pool.c
+++ b/net/xdp/xsk_buff_pool.c
@@ -170,6 +170,9 @@ int xp_assign_dev(struct xsk_buff_pool *pool,
if (err)
return err;
+ if (flags & XDP_USE_SG)
+ pool->umem->flags |= XDP_UMEM_SG_FLAG;
+
if (flags & XDP_USE_NEED_WAKEUP)
pool->uses_need_wakeup = true;
/* Tx needs to be explicitly woken up the first time. Also
--
2.34.1
