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authorBjörn Töpel <bjorn.topel@intel.com>2020-05-20 21:20:53 +0200
committerAlexei Starovoitov <ast@kernel.org>2020-05-21 17:31:26 -0700
commit2b43470add8c8ff1e1ee28dffc5c5df97e955d09 (patch)
treef2e61f5891abf48c657365a324d091cdf3922ff0 /include/trace
parentxsk: Move defines only used by AF_XDP internals to xsk.h (diff)
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xsk: Introduce AF_XDP buffer allocation API
In order to simplify AF_XDP zero-copy enablement for NIC driver developers, a new AF_XDP buffer allocation API is added. The implementation is based on a single core (single producer/consumer) buffer pool for the AF_XDP UMEM. A buffer is allocated using the xsk_buff_alloc() function, and returned using xsk_buff_free(). If a buffer is disassociated with the pool, e.g. when a buffer is passed to an AF_XDP socket, a buffer is said to be released. Currently, the release function is only used by the AF_XDP internals and not visible to the driver. Drivers using this API should register the XDP memory model with the new MEM_TYPE_XSK_BUFF_POOL type. The API is defined in net/xdp_sock_drv.h. The buffer type is struct xdp_buff, and follows the lifetime of regular xdp_buffs, i.e. the lifetime of an xdp_buff is restricted to a NAPI context. In other words, the API is not replacing xdp_frames. In addition to introducing the API and implementations, the AF_XDP core is migrated to use the new APIs. rfc->v1: Fixed build errors/warnings for m68k and riscv. (kbuild test robot) Added headroom/chunk size getter. (Maxim/Björn) v1->v2: Swapped SoBs. (Maxim) v2->v3: Initialize struct xdp_buff member frame_sz. (Björn) Add API to query the DMA address of a frame. (Maxim) Do DMA sync for CPU till the end of the frame to handle possible growth (frame_sz). (Maxim) Signed-off-by: Björn Töpel <bjorn.topel@intel.com> Signed-off-by: Maxim Mikityanskiy <maximmi@mellanox.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20200520192103.355233-6-bjorn.topel@gmail.com
Diffstat (limited to 'include/trace')
-rw-r--r--include/trace/events/xdp.h3
1 files changed, 2 insertions, 1 deletions
diff --git a/include/trace/events/xdp.h b/include/trace/events/xdp.h
index b95d65e8c628..48547a12fa27 100644
--- a/include/trace/events/xdp.h
+++ b/include/trace/events/xdp.h
@@ -287,7 +287,8 @@ TRACE_EVENT(xdp_devmap_xmit,
FN(PAGE_SHARED) \
FN(PAGE_ORDER0) \
FN(PAGE_POOL) \
- FN(ZERO_COPY)
+ FN(ZERO_COPY) \
+ FN(XSK_BUFF_POOL)
#define __MEM_TYPE_TP_FN(x) \
TRACE_DEFINE_ENUM(MEM_TYPE_##x);