On Thu, Sep 07, 2023 at 09:20:32AM +0530, Tirthendu Sarkar wrote: > 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) nit: This could be BIT(1)