2 * Copyright (C) 2011-2013 Matteo Landi, Luigi Rizzo. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * The header contains the definitions of constants and function
30 * prototypes used only in kernelspace.
33 #ifndef _NET_NETMAP_KERN_H_
34 #define _NET_NETMAP_KERN_H_
36 #if defined(__FreeBSD__)
38 #define likely(x) __builtin_expect(!!(x), 1)
39 #define unlikely(x) __builtin_expect(!!(x), 0)
41 #define NM_LOCK_T struct mtx
42 #define NM_SELINFO_T struct selinfo
43 #define MBUF_LEN(m) ((m)->m_pkthdr.len)
44 #define NM_SEND_UP(ifp, m) ((ifp)->if_input)(ifp, m)
48 #define NM_LOCK_T safe_spinlock_t // see bsd_glue.h
49 #define NM_SELINFO_T wait_queue_head_t
50 #define MBUF_LEN(m) ((m)->len)
51 #define NM_SEND_UP(ifp, m) netif_rx(m)
58 * IFCAP_NETMAP goes into net_device's priv_flags (if_capenable).
59 * This was 16 bits up to linux 2.6.36, so we need a 16 bit value on older
60 * platforms and tolerate the clash with IFF_DYNAMIC and IFF_BRIDGE_PORT.
61 * For the 32-bit value, 0x100000 has no clashes until at least 3.5.1
63 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,37)
64 #define IFCAP_NETMAP 0x8000
66 #define IFCAP_NETMAP 0x100000
69 #elif defined (__APPLE__)
71 #warning apple support is incomplete.
72 #define likely(x) __builtin_expect(!!(x), 1)
73 #define unlikely(x) __builtin_expect(!!(x), 0)
74 #define NM_LOCK_T IOLock *
75 #define NM_SELINFO_T struct selinfo
76 #define MBUF_LEN(m) ((m)->m_pkthdr.len)
77 #define NM_SEND_UP(ifp, m) ((ifp)->if_input)(ifp, m)
81 #error unsupported platform
83 #endif /* end - platform-specific code */
85 #define ND(format, ...)
86 #define D(format, ...) \
88 struct timeval __xxts; \
90 printf("%03d.%06d %s [%d] " format "\n", \
91 (int)__xxts.tv_sec % 1000, (int)__xxts.tv_usec, \
92 __FUNCTION__, __LINE__, ##__VA_ARGS__); \
95 /* rate limited, lps indicates how many per second */
96 #define RD(lps, format, ...) \
98 static int t0, __cnt; \
99 if (t0 != time_second) { \
104 D(format, ##__VA_ARGS__); \
107 struct netmap_adapter;
110 * private, kernel view of a ring. Keeps track of the status of
111 * a ring across system calls.
113 * nr_hwcur index of the next buffer to refill.
114 * It corresponds to ring->cur - ring->reserved
116 * nr_hwavail the number of slots "owned" by userspace.
117 * nr_hwavail =:= ring->avail + ring->reserved
119 * The indexes in the NIC and netmap rings are offset by nkr_hwofs slots.
120 * This is so that, on a reset, buffers owned by userspace are not
121 * modified by the kernel. In particular:
122 * RX rings: the next empty buffer (hwcur + hwavail + hwofs) coincides with
123 * the next empty buffer as known by the hardware (next_to_check or so).
124 * TX rings: hwcur + hwofs coincides with next_to_send
126 * For received packets, slot->flags is set to nkr_slot_flags
127 * so we can provide a proper initial value (e.g. set NS_FORWARD
128 * when operating in 'transparent' mode).
130 struct netmap_kring {
131 struct netmap_ring *ring;
134 u_int nr_kflags; /* private driver flags */
135 #define NKR_PENDINTR 0x1 // Pending interrupt.
138 uint16_t nkr_slot_flags; /* initial value for flags */
139 int nkr_hwofs; /* offset between NIC and netmap ring */
140 struct netmap_adapter *na;
141 NM_SELINFO_T si; /* poll/select wait queue */
142 NM_LOCK_T q_lock; /* used if no device lock available */
143 } __attribute__((__aligned__(64)));
146 * This struct extends the 'struct adapter' (or
147 * equivalent) device descriptor. It contains all fields needed to
148 * support netmap operation.
150 struct netmap_adapter {
152 * On linux we do not have a good way to tell if an interface
153 * is netmap-capable. So we use the following trick:
154 * NA(ifp) points here, and the first entry (which hopefully
155 * always exists and is at least 32 bits) contains a magic
156 * value which we can use to detect that the interface is good.
159 uint32_t na_flags; /* future place for IFCAP_NETMAP */
160 #define NAF_SKIP_INTR 1 /* use the regular interrupt handler.
161 * useful during initialization
163 int refcount; /* number of user-space descriptors using this
164 interface, which is equal to the number of
165 struct netmap_if objs in the mapped region. */
167 * The selwakeup in the interrupt thread can use per-ring
168 * and/or global wait queues. We track how many clients
169 * of each type we have so we can optimize the drivers,
170 * and especially avoid huge contention on the locks.
172 int na_single; /* threads attached to a single hw queue */
173 int na_multi; /* threads attached to multiple hw queues */
175 int separate_locks; /* set if the interface suports different
176 locks for rx, tx and core. */
178 u_int num_rx_rings; /* number of adapter receive rings */
179 u_int num_tx_rings; /* number of adapter transmit rings */
181 u_int num_tx_desc; /* number of descriptor in each queue */
184 /* tx_rings and rx_rings are private but allocated
185 * as a contiguous chunk of memory. Each array has
186 * N+1 entries, for the adapter queues and for the host queue.
188 struct netmap_kring *tx_rings; /* array of TX rings. */
189 struct netmap_kring *rx_rings; /* array of RX rings. */
191 NM_SELINFO_T tx_si, rx_si; /* global wait queues */
193 /* copy of if_qflush and if_transmit pointers, to intercept
194 * packets from the network stack when netmap is active.
196 int (*if_transmit)(struct ifnet *, struct mbuf *);
198 /* references to the ifnet and device routines, used by
199 * the generic netmap functions.
201 struct ifnet *ifp; /* adapter is ifp->if_softc */
203 NM_LOCK_T core_lock; /* used if no device lock available */
205 int (*nm_register)(struct ifnet *, int onoff);
206 void (*nm_lock)(struct ifnet *, int what, u_int ringid);
207 int (*nm_txsync)(struct ifnet *, u_int ring, int lock);
208 int (*nm_rxsync)(struct ifnet *, u_int ring, int lock);
209 /* return configuration information */
210 int (*nm_config)(struct ifnet *, u_int *txr, u_int *txd,
211 u_int *rxr, u_int *rxd);
216 * bdg_port is the port number used in the bridge;
217 * na_bdg_refcount is a refcount used for bridge ports,
218 * when it goes to 0 we can detach+free this port
219 * (a bridge port is always attached if it exists;
220 * it is not always registered)
226 struct net_device_ops nm_ndo;
231 * The combination of "enable" (ifp->if_capenable & IFCAP_NETMAP)
232 * and refcount gives the status of the interface, namely:
234 * enable refcount Status
236 * FALSE 0 normal operation
237 * FALSE != 0 -- (impossible)
239 * TRUE 0 being deleted.
242 #define NETMAP_DELETING(_na) ( ((_na)->refcount == 0) && \
243 ( (_na)->ifp->if_capenable & IFCAP_NETMAP) )
246 * parameters for (*nm_lock)(adapter, what, index)
250 NETMAP_CORE_LOCK, NETMAP_CORE_UNLOCK,
251 NETMAP_TX_LOCK, NETMAP_TX_UNLOCK,
252 NETMAP_RX_LOCK, NETMAP_RX_UNLOCK,
254 #define NETMAP_REG_LOCK NETMAP_CORE_LOCK
255 #define NETMAP_REG_UNLOCK NETMAP_CORE_UNLOCK
257 NETMAP_REG_LOCK, NETMAP_REG_UNLOCK
261 /* How to handle locking support in netmap_rx_irq/netmap_tx_irq */
262 #define NETMAP_LOCKED_ENTER 0x10000000 /* already locked on enter */
263 #define NETMAP_LOCKED_EXIT 0x20000000 /* keep locked on exit */
266 * The following are support routines used by individual drivers to
267 * support netmap operation.
269 * netmap_attach() initializes a struct netmap_adapter, allocating the
270 * struct netmap_ring's and the struct selinfo.
272 * netmap_detach() frees the memory allocated by netmap_attach().
274 * netmap_start() replaces the if_transmit routine of the interface,
275 * and is used to intercept packets coming from the stack.
277 * netmap_load_map/netmap_reload_map are helper routines to set/reset
278 * the dmamap for a packet buffer
280 * netmap_reset() is a helper routine to be called in the driver
281 * when reinitializing a ring.
283 int netmap_attach(struct netmap_adapter *, int);
284 void netmap_detach(struct ifnet *);
285 int netmap_start(struct ifnet *, struct mbuf *);
286 enum txrx { NR_RX = 0, NR_TX = 1 };
287 struct netmap_slot *netmap_reset(struct netmap_adapter *na,
288 enum txrx tx, int n, u_int new_cur);
289 int netmap_ring_reinit(struct netmap_kring *);
291 extern u_int netmap_buf_size;
292 #define NETMAP_BUF_SIZE netmap_buf_size // XXX remove
293 extern int netmap_mitigate;
294 extern int netmap_no_pendintr;
295 extern u_int netmap_total_buffers;
296 extern char *netmap_buffer_base;
297 extern int netmap_verbose; // XXX debugging
298 enum { /* verbose flags */
299 NM_VERB_ON = 1, /* generic verbose */
300 NM_VERB_HOST = 0x2, /* verbose host stack */
301 NM_VERB_RXSYNC = 0x10, /* verbose on rxsync/txsync */
302 NM_VERB_TXSYNC = 0x20,
303 NM_VERB_RXINTR = 0x100, /* verbose on rx/tx intr (driver) */
304 NM_VERB_TXINTR = 0x200,
305 NM_VERB_NIC_RXSYNC = 0x1000, /* verbose on rx/tx intr (driver) */
306 NM_VERB_NIC_TXSYNC = 0x2000,
310 * NA returns a pointer to the struct netmap adapter from the ifp,
311 * WNA is used to write it.
314 #define WNA(_ifp) (_ifp)->if_pspare[0]
316 #define NA(_ifp) ((struct netmap_adapter *)WNA(_ifp))
319 * Macros to determine if an interface is netmap capable or netmap enabled.
320 * See the magic field in struct netmap_adapter.
324 * on FreeBSD just use if_capabilities and if_capenable.
326 #define NETMAP_CAPABLE(ifp) (NA(ifp) && \
327 (ifp)->if_capabilities & IFCAP_NETMAP )
329 #define NETMAP_SET_CAPABLE(ifp) \
330 (ifp)->if_capabilities |= IFCAP_NETMAP
336 * we check if NA(ifp) is set and its first element has a related
337 * magic value. The capenable is within the struct netmap_adapter.
339 #define NETMAP_MAGIC 0x52697a7a
341 #define NETMAP_CAPABLE(ifp) (NA(ifp) && \
342 ((uint32_t)(uintptr_t)NA(ifp) ^ NA(ifp)->magic) == NETMAP_MAGIC )
344 #define NETMAP_SET_CAPABLE(ifp) \
345 NA(ifp)->magic = ((uint32_t)(uintptr_t)NA(ifp)) ^ NETMAP_MAGIC
350 /* Callback invoked by the dma machinery after a successfull dmamap_load */
351 static void netmap_dmamap_cb(__unused void *arg,
352 __unused bus_dma_segment_t * segs, __unused int nseg, __unused int error)
356 /* bus_dmamap_load wrapper: call aforementioned function if map != NULL.
357 * XXX can we do it without a callback ?
360 netmap_load_map(bus_dma_tag_t tag, bus_dmamap_t map, void *buf)
363 bus_dmamap_load(tag, map, buf, NETMAP_BUF_SIZE,
364 netmap_dmamap_cb, NULL, BUS_DMA_NOWAIT);
367 /* update the map when a buffer changes. */
369 netmap_reload_map(bus_dma_tag_t tag, bus_dmamap_t map, void *buf)
372 bus_dmamap_unload(tag, map);
373 bus_dmamap_load(tag, map, buf, NETMAP_BUF_SIZE,
374 netmap_dmamap_cb, NULL, BUS_DMA_NOWAIT);
380 * XXX How do we redefine these functions:
383 * dma_map_single(&pdev->dev, virt_addr, len, direction)
384 * dma_unmap_single(&adapter->pdev->dev, phys_addr, len, direction
385 * The len can be implicit (on netmap it is NETMAP_BUF_SIZE)
386 * unfortunately the direction is not, so we need to change
387 * something to have a cross API
389 #define netmap_load_map(_t, _m, _b)
390 #define netmap_reload_map(_t, _m, _b)
392 struct e1000_buffer *buffer_info = &tx_ring->buffer_info[l];
393 /* set time_stamp *before* dma to help avoid a possible race */
394 buffer_info->time_stamp = jiffies;
395 buffer_info->mapped_as_page = false;
396 buffer_info->length = len;
397 //buffer_info->next_to_watch = l;
399 dma_unmap_single(&adapter->pdev->dev, buffer_info->dma,
400 NETMAP_BUF_SIZE, DMA_TO_DEVICE);
401 buffer_info->dma = dma_map_single(&adapter->pdev->dev,
402 addr, NETMAP_BUF_SIZE, DMA_TO_DEVICE);
404 if (dma_mapping_error(&adapter->pdev->dev, buffer_info->dma)) {
405 D("dma mapping error");
406 /* goto dma_error; See e1000_put_txbuf() */
409 tx_desc->buffer_addr = htole64(buffer_info->dma); //XXX
414 * The bus_dmamap_sync() can be one of wmb() or rmb() depending on direction.
416 #define bus_dmamap_sync(_a, _b, _c)
421 * functions to map NIC to KRING indexes (n2k) and vice versa (k2n)
424 netmap_idx_n2k(struct netmap_kring *kr, int idx)
426 int n = kr->nkr_num_slots;
427 idx += kr->nkr_hwofs;
438 netmap_idx_k2n(struct netmap_kring *kr, int idx)
440 int n = kr->nkr_num_slots;
441 idx -= kr->nkr_hwofs;
451 /* Entries of the look-up table. */
453 void *vaddr; /* virtual address. */
454 vm_paddr_t paddr; /* physical address. */
457 struct netmap_obj_pool;
458 extern struct lut_entry *netmap_buffer_lut;
459 #define NMB_VA(i) (netmap_buffer_lut[i].vaddr)
460 #define NMB_PA(i) (netmap_buffer_lut[i].paddr)
463 * NMB return the virtual address of a buffer (buffer 0 on bad index)
464 * PNMB also fills the physical address
467 NMB(struct netmap_slot *slot)
469 uint32_t i = slot->buf_idx;
470 return (unlikely(i >= netmap_total_buffers)) ? NMB_VA(0) : NMB_VA(i);
474 PNMB(struct netmap_slot *slot, uint64_t *pp)
476 uint32_t i = slot->buf_idx;
477 void *ret = (i >= netmap_total_buffers) ? NMB_VA(0) : NMB_VA(i);
479 *pp = (i >= netmap_total_buffers) ? NMB_PA(0) : NMB_PA(i);
483 /* default functions to handle rx/tx interrupts */
484 int netmap_rx_irq(struct ifnet *, int, int *);
485 #define netmap_tx_irq(_n, _q) netmap_rx_irq(_n, _q, NULL)
487 #endif /* _NET_NETMAP_KERN_H_ */