xsk: Remove MEM_TYPE_ZERO_COPY and corresponding code

There are no users of MEM_TYPE_ZERO_COPY. Remove all corresponding
code, including the "handle" member of struct xdp_buff.

rfc->v1: Fixed spelling in commit message. (Björn)

Signed-off-by: Björn Töpel <bjorn.topel@intel.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200520192103.355233-13-bjorn.topel@gmail.com

4 files changed, 1 insertions, 203 deletions

diff --git a/include/net/xdp.h b/include/net/xdp.h
index f432134c7c00..90f11760bd12 100644
--- a/include/net/xdp.h
+++ b/include/net/xdp.h
@@ -39,7 +39,6 @@ enum xdp_mem_type {
 	MEM_TYPE_PAGE_SHARED = 0, /* Split-page refcnt based model */
 	MEM_TYPE_PAGE_ORDER0,     /* Orig XDP full page model */
 	MEM_TYPE_PAGE_POOL,
-	MEM_TYPE_ZERO_COPY,
 	MEM_TYPE_XSK_BUFF_POOL,
 	MEM_TYPE_MAX,
 };
@@ -55,10 +54,6 @@ struct xdp_mem_info {
 
 struct page_pool;
 
-struct zero_copy_allocator {
-	void (*free)(struct zero_copy_allocator *zca, unsigned long handle);
-};
-
 struct xdp_rxq_info {
 	struct net_device *dev;
 	u32 queue_index;
@@ -71,7 +66,6 @@ struct xdp_buff {
 	void *data_end;
 	void *data_meta;
 	void *data_hard_start;
-	unsigned long handle;
 	struct xdp_rxq_info *rxq;
 	u32 frame_sz; /* frame size to deduce data_hard_end/reserved tailroom*/
 };
@@ -120,8 +114,7 @@ struct xdp_frame *convert_to_xdp_frame(struct xdp_buff *xdp)
 	int metasize;
 	int headroom;
 
-	if (xdp->rxq->mem.type == MEM_TYPE_ZERO_COPY ||
-	    xdp->rxq->mem.type == MEM_TYPE_XSK_BUFF_POOL)
+	if (xdp->rxq->mem.type == MEM_TYPE_XSK_BUFF_POOL)
 		return xdp_convert_zc_to_xdp_frame(xdp);
 
 	/* Assure headroom is available for storing info */
diff --git a/include/net/xdp_sock.h b/include/net/xdp_sock.h
index 6e7265f63c04..96bfc5f5f24e 100644
--- a/include/net/xdp_sock.h
+++ b/include/net/xdp_sock.h
@@ -17,26 +17,12 @@ struct net_device;
 struct xsk_queue;
 struct xdp_buff;
 
-struct xdp_umem_page {
-	void *addr;
-	dma_addr_t dma;
-};
-
-struct xdp_umem_fq_reuse {
-	u32 nentries;
-	u32 length;
-	u64 handles[];
-};
-
 struct xdp_umem {
 	struct xsk_queue *fq;
 	struct xsk_queue *cq;
 	struct xsk_buff_pool *pool;
-	struct xdp_umem_page *pages;
-	u64 chunk_mask;
 	u64 size;
 	u32 headroom;
-	u32 chunk_size_nohr;
 	u32 chunk_size;
 	struct user_struct *user;
 	refcount_t users;
@@ -48,7 +34,6 @@ struct xdp_umem {
 	u8 flags;
 	int id;
 	struct net_device *dev;
-	struct xdp_umem_fq_reuse *fq_reuse;
 	bool zc;
 	spinlock_t xsk_tx_list_lock;
 	struct list_head xsk_tx_list;
@@ -109,21 +94,6 @@ static inline struct xdp_sock *__xsk_map_lookup_elem(struct bpf_map *map,
 	return xs;
 }
 
-static inline u64 xsk_umem_extract_addr(u64 addr)
-{
-	return addr & XSK_UNALIGNED_BUF_ADDR_MASK;
-}
-
-static inline u64 xsk_umem_extract_offset(u64 addr)
-{
-	return addr >> XSK_UNALIGNED_BUF_OFFSET_SHIFT;
-}
-
-static inline u64 xsk_umem_add_offset_to_addr(u64 addr)
-{
-	return xsk_umem_extract_addr(addr) + xsk_umem_extract_offset(addr);
-}
-
 #else
 
 static inline int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp)
@@ -146,21 +116,6 @@ static inline struct xdp_sock *__xsk_map_lookup_elem(struct bpf_map *map,
 	return NULL;
 }
 
-static inline u64 xsk_umem_extract_addr(u64 addr)
-{
-	return 0;
-}
-
-static inline u64 xsk_umem_extract_offset(u64 addr)
-{
-	return 0;
-}
-
-static inline u64 xsk_umem_add_offset_to_addr(u64 addr)
-{
-	return 0;
-}
-
 #endif /* CONFIG_XDP_SOCKETS */
 
 #endif /* _LINUX_XDP_SOCK_H */
diff --git a/include/net/xdp_sock_drv.h b/include/net/xdp_sock_drv.h
index 7752c8663d1b..ccf848f7efa4 100644
--- a/include/net/xdp_sock_drv.h
+++ b/include/net/xdp_sock_drv.h
@@ -11,16 +11,9 @@
 
 #ifdef CONFIG_XDP_SOCKETS
 
-bool xsk_umem_has_addrs(struct xdp_umem *umem, u32 cnt);
-bool xsk_umem_peek_addr(struct xdp_umem *umem, u64 *addr);
-void xsk_umem_release_addr(struct xdp_umem *umem);
 void xsk_umem_complete_tx(struct xdp_umem *umem, u32 nb_entries);
 bool xsk_umem_consume_tx(struct xdp_umem *umem, struct xdp_desc *desc);
 void xsk_umem_consume_tx_done(struct xdp_umem *umem);
-struct xdp_umem_fq_reuse *xsk_reuseq_prepare(u32 nentries);
-struct xdp_umem_fq_reuse *xsk_reuseq_swap(struct xdp_umem *umem,
-					  struct xdp_umem_fq_reuse *newq);
-void xsk_reuseq_free(struct xdp_umem_fq_reuse *rq);
 struct xdp_umem *xdp_get_umem_from_qid(struct net_device *dev, u16 queue_id);
 void xsk_set_rx_need_wakeup(struct xdp_umem *umem);
 void xsk_set_tx_need_wakeup(struct xdp_umem *umem);
@@ -28,80 +21,6 @@ void xsk_clear_rx_need_wakeup(struct xdp_umem *umem);
 void xsk_clear_tx_need_wakeup(struct xdp_umem *umem);
 bool xsk_umem_uses_need_wakeup(struct xdp_umem *umem);
 
-static inline char *xdp_umem_get_data(struct xdp_umem *umem, u64 addr)
-{
-	unsigned long page_addr;
-
-	addr = xsk_umem_add_offset_to_addr(addr);
-	page_addr = (unsigned long)umem->pages[addr >> PAGE_SHIFT].addr;
-
-	return (char *)(page_addr & PAGE_MASK) + (addr & ~PAGE_MASK);
-}
-
-static inline dma_addr_t xdp_umem_get_dma(struct xdp_umem *umem, u64 addr)
-{
-	addr = xsk_umem_add_offset_to_addr(addr);
-
-	return umem->pages[addr >> PAGE_SHIFT].dma + (addr & ~PAGE_MASK);
-}
-
-/* Reuse-queue aware version of FILL queue helpers */
-static inline bool xsk_umem_has_addrs_rq(struct xdp_umem *umem, u32 cnt)
-{
-	struct xdp_umem_fq_reuse *rq = umem->fq_reuse;
-
-	if (rq->length >= cnt)
-		return true;
-
-	return xsk_umem_has_addrs(umem, cnt - rq->length);
-}
-
-static inline bool xsk_umem_peek_addr_rq(struct xdp_umem *umem, u64 *addr)
-{
-	struct xdp_umem_fq_reuse *rq = umem->fq_reuse;
-
-	if (!rq->length)
-		return xsk_umem_peek_addr(umem, addr);
-
-	*addr = rq->handles[rq->length - 1];
-	return addr;
-}
-
-static inline void xsk_umem_release_addr_rq(struct xdp_umem *umem)
-{
-	struct xdp_umem_fq_reuse *rq = umem->fq_reuse;
-
-	if (!rq->length)
-		xsk_umem_release_addr(umem);
-	else
-		rq->length--;
-}
-
-static inline void xsk_umem_fq_reuse(struct xdp_umem *umem, u64 addr)
-{
-	struct xdp_umem_fq_reuse *rq = umem->fq_reuse;
-
-	rq->handles[rq->length++] = addr;
-}
-
-/* Handle the offset appropriately depending on aligned or unaligned mode.
- * For unaligned mode, we store the offset in the upper 16-bits of the address.
- * For aligned mode, we simply add the offset to the address.
- */
-static inline u64 xsk_umem_adjust_offset(struct xdp_umem *umem, u64 address,
-					 u64 offset)
-{
-	if (umem->flags & XDP_UMEM_UNALIGNED_CHUNK_FLAG)
-		return address + (offset << XSK_UNALIGNED_BUF_OFFSET_SHIFT);
-	else
-		return address + offset;
-}
-
-static inline u32 xsk_umem_xdp_frame_sz(struct xdp_umem *umem)
-{
-	return umem->chunk_size_nohr;
-}
-
 static inline u32 xsk_umem_get_headroom(struct xdp_umem *umem)
 {
 	return XDP_PACKET_HEADROOM + umem->headroom;
@@ -192,20 +111,6 @@ static inline void xsk_buff_raw_dma_sync_for_device(struct xdp_umem *umem,
 
 #else
 
-static inline bool xsk_umem_has_addrs(struct xdp_umem *umem, u32 cnt)
-{
-	return false;
-}
-
-static inline u64 *xsk_umem_peek_addr(struct xdp_umem *umem, u64 *addr)
-{
-	return NULL;
-}
-
-static inline void xsk_umem_release_addr(struct xdp_umem *umem)
-{
-}
-
 static inline void xsk_umem_complete_tx(struct xdp_umem *umem, u32 nb_entries)
 {
 }
@@ -220,55 +125,12 @@ static inline void xsk_umem_consume_tx_done(struct xdp_umem *umem)
 {
 }
 
-static inline struct xdp_umem_fq_reuse *xsk_reuseq_prepare(u32 nentries)
-{
-	return NULL;
-}
-
-static inline struct xdp_umem_fq_reuse *xsk_reuseq_swap(
-	struct xdp_umem *umem, struct xdp_umem_fq_reuse *newq)
-{
-	return NULL;
-}
-
-static inline void xsk_reuseq_free(struct xdp_umem_fq_reuse *rq)
-{
-}
-
 static inline struct xdp_umem *xdp_get_umem_from_qid(struct net_device *dev,
 						     u16 queue_id)
 {
 	return NULL;
 }
 
-static inline char *xdp_umem_get_data(struct xdp_umem *umem, u64 addr)
-{
-	return NULL;
-}
-
-static inline dma_addr_t xdp_umem_get_dma(struct xdp_umem *umem, u64 addr)
-{
-	return 0;
-}
-
-static inline bool xsk_umem_has_addrs_rq(struct xdp_umem *umem, u32 cnt)
-{
-	return false;
-}
-
-static inline u64 *xsk_umem_peek_addr_rq(struct xdp_umem *umem, u64 *addr)
-{
-	return NULL;
-}
-
-static inline void xsk_umem_release_addr_rq(struct xdp_umem *umem)
-{
-}
-
-static inline void xsk_umem_fq_reuse(struct xdp_umem *umem, u64 addr)
-{
-}
-
 static inline void xsk_set_rx_need_wakeup(struct xdp_umem *umem)
 {
 }
@@ -290,17 +152,6 @@ static inline bool xsk_umem_uses_need_wakeup(struct xdp_umem *umem)
 	return false;
 }
 
-static inline u64 xsk_umem_adjust_offset(struct xdp_umem *umem, u64 handle,
-					 u64 offset)
-{
-	return 0;
-}
-
-static inline u32 xsk_umem_xdp_frame_sz(struct xdp_umem *umem)
-{
-	return 0;
-}
-
 static inline u32 xsk_umem_get_headroom(struct xdp_umem *umem)
 {
 	return 0;
diff --git a/include/trace/events/xdp.h b/include/trace/events/xdp.h
index 48547a12fa27..b73d3e141323 100644
--- a/include/trace/events/xdp.h
+++ b/include/trace/events/xdp.h
@@ -287,7 +287,6 @@ TRACE_EVENT(xdp_devmap_xmit,
 	FN(PAGE_SHARED)		\
 	FN(PAGE_ORDER0)		\
 	FN(PAGE_POOL)		\
-	FN(ZERO_COPY)		\
 	FN(XSK_BUFF_POOL)
 
 #define __MEM_TYPE_TP_FN(x)	\