1422d97b8SChris Packham // SPDX-License-Identifier: GPL-2.0
2422d97b8SChris Packham /*
3422d97b8SChris Packham * This file is based on code from OCTEON SDK by Cavium Networks.
4422d97b8SChris Packham *
5422d97b8SChris Packham * Copyright (c) 2003-2010 Cavium Networks
6422d97b8SChris Packham */
7422d97b8SChris Packham
8422d97b8SChris Packham #include <linux/module.h>
9422d97b8SChris Packham #include <linux/kernel.h>
10422d97b8SChris Packham #include <linux/netdevice.h>
11422d97b8SChris Packham #include <linux/etherdevice.h>
12422d97b8SChris Packham #include <linux/ip.h>
13422d97b8SChris Packham #include <linux/ratelimit.h>
14422d97b8SChris Packham #include <linux/string.h>
15422d97b8SChris Packham #include <linux/interrupt.h>
16422d97b8SChris Packham #include <net/dst.h>
17422d97b8SChris Packham #ifdef CONFIG_XFRM
18422d97b8SChris Packham #include <linux/xfrm.h>
19422d97b8SChris Packham #include <net/xfrm.h>
20422d97b8SChris Packham #endif /* CONFIG_XFRM */
21422d97b8SChris Packham
22422d97b8SChris Packham #include <linux/atomic.h>
23422d97b8SChris Packham #include <net/sch_generic.h>
24422d97b8SChris Packham
25422d97b8SChris Packham #include "octeon-ethernet.h"
26422d97b8SChris Packham #include "ethernet-defines.h"
27422d97b8SChris Packham #include "ethernet-tx.h"
28422d97b8SChris Packham #include "ethernet-util.h"
29422d97b8SChris Packham
30422d97b8SChris Packham #define CVM_OCT_SKB_CB(skb) ((u64 *)((skb)->cb))
31422d97b8SChris Packham
32422d97b8SChris Packham /*
33422d97b8SChris Packham * You can define GET_SKBUFF_QOS() to override how the skbuff output
34422d97b8SChris Packham * function determines which output queue is used. The default
35422d97b8SChris Packham * implementation always uses the base queue for the port. If, for
36422d97b8SChris Packham * example, you wanted to use the skb->priority field, define
37422d97b8SChris Packham * GET_SKBUFF_QOS as: #define GET_SKBUFF_QOS(skb) ((skb)->priority)
38422d97b8SChris Packham */
39422d97b8SChris Packham #ifndef GET_SKBUFF_QOS
40422d97b8SChris Packham #define GET_SKBUFF_QOS(skb) 0
41422d97b8SChris Packham #endif
42422d97b8SChris Packham
43422d97b8SChris Packham static void cvm_oct_tx_do_cleanup(unsigned long arg);
44b13fecb1SKees Cook static DECLARE_TASKLET_OLD(cvm_oct_tx_cleanup_tasklet, cvm_oct_tx_do_cleanup);
45422d97b8SChris Packham
46422d97b8SChris Packham /* Maximum number of SKBs to try to free per xmit packet. */
47422d97b8SChris Packham #define MAX_SKB_TO_FREE (MAX_OUT_QUEUE_DEPTH * 2)
48422d97b8SChris Packham
cvm_oct_adjust_skb_to_free(int skb_to_free,int fau)49422d97b8SChris Packham static inline int cvm_oct_adjust_skb_to_free(int skb_to_free, int fau)
50422d97b8SChris Packham {
51422d97b8SChris Packham int undo;
52422d97b8SChris Packham
53422d97b8SChris Packham undo = skb_to_free > 0 ? MAX_SKB_TO_FREE : skb_to_free +
54422d97b8SChris Packham MAX_SKB_TO_FREE;
55422d97b8SChris Packham if (undo > 0)
56422d97b8SChris Packham cvmx_fau_atomic_add32(fau, -undo);
57422d97b8SChris Packham skb_to_free = -skb_to_free > MAX_SKB_TO_FREE ? MAX_SKB_TO_FREE :
58422d97b8SChris Packham -skb_to_free;
59422d97b8SChris Packham return skb_to_free;
60422d97b8SChris Packham }
61422d97b8SChris Packham
cvm_oct_kick_tx_poll_watchdog(void)62422d97b8SChris Packham static void cvm_oct_kick_tx_poll_watchdog(void)
63422d97b8SChris Packham {
64422d97b8SChris Packham union cvmx_ciu_timx ciu_timx;
65422d97b8SChris Packham
66422d97b8SChris Packham ciu_timx.u64 = 0;
67422d97b8SChris Packham ciu_timx.s.one_shot = 1;
68422d97b8SChris Packham ciu_timx.s.len = cvm_oct_tx_poll_interval;
69422d97b8SChris Packham cvmx_write_csr(CVMX_CIU_TIMX(1), ciu_timx.u64);
70422d97b8SChris Packham }
71422d97b8SChris Packham
cvm_oct_free_tx_skbs(struct net_device * dev)72422d97b8SChris Packham static void cvm_oct_free_tx_skbs(struct net_device *dev)
73422d97b8SChris Packham {
74422d97b8SChris Packham int skb_to_free;
75422d97b8SChris Packham int qos, queues_per_port;
76422d97b8SChris Packham int total_remaining = 0;
77422d97b8SChris Packham unsigned long flags;
78422d97b8SChris Packham struct octeon_ethernet *priv = netdev_priv(dev);
79422d97b8SChris Packham
80422d97b8SChris Packham queues_per_port = cvmx_pko_get_num_queues(priv->port);
81422d97b8SChris Packham /* Drain any pending packets in the free list */
82422d97b8SChris Packham for (qos = 0; qos < queues_per_port; qos++) {
83422d97b8SChris Packham if (skb_queue_len(&priv->tx_free_list[qos]) == 0)
84422d97b8SChris Packham continue;
85422d97b8SChris Packham skb_to_free = cvmx_fau_fetch_and_add32(priv->fau + qos * 4,
86422d97b8SChris Packham MAX_SKB_TO_FREE);
87422d97b8SChris Packham skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free,
88422d97b8SChris Packham priv->fau + qos * 4);
89422d97b8SChris Packham if (skb_to_free > 0) {
90422d97b8SChris Packham struct sk_buff *to_free_list = NULL;
91422d97b8SChris Packham
92422d97b8SChris Packham spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
93422d97b8SChris Packham while (skb_to_free > 0) {
94422d97b8SChris Packham struct sk_buff *t;
95422d97b8SChris Packham
96422d97b8SChris Packham t = __skb_dequeue(&priv->tx_free_list[qos]);
97422d97b8SChris Packham t->next = to_free_list;
98422d97b8SChris Packham to_free_list = t;
99422d97b8SChris Packham skb_to_free--;
100422d97b8SChris Packham }
101422d97b8SChris Packham spin_unlock_irqrestore(&priv->tx_free_list[qos].lock,
102422d97b8SChris Packham flags);
103422d97b8SChris Packham /* Do the actual freeing outside of the lock. */
104422d97b8SChris Packham while (to_free_list) {
105422d97b8SChris Packham struct sk_buff *t = to_free_list;
106422d97b8SChris Packham
107422d97b8SChris Packham to_free_list = to_free_list->next;
108422d97b8SChris Packham dev_kfree_skb_any(t);
109422d97b8SChris Packham }
110422d97b8SChris Packham }
111422d97b8SChris Packham total_remaining += skb_queue_len(&priv->tx_free_list[qos]);
112422d97b8SChris Packham }
113422d97b8SChris Packham if (total_remaining < MAX_OUT_QUEUE_DEPTH && netif_queue_stopped(dev))
114422d97b8SChris Packham netif_wake_queue(dev);
115422d97b8SChris Packham if (total_remaining)
116422d97b8SChris Packham cvm_oct_kick_tx_poll_watchdog();
117422d97b8SChris Packham }
118422d97b8SChris Packham
119422d97b8SChris Packham /**
120422d97b8SChris Packham * cvm_oct_xmit - transmit a packet
121422d97b8SChris Packham * @skb: Packet to send
122422d97b8SChris Packham * @dev: Device info structure
123422d97b8SChris Packham *
124422d97b8SChris Packham * Returns Always returns NETDEV_TX_OK
125422d97b8SChris Packham */
cvm_oct_xmit(struct sk_buff * skb,struct net_device * dev)126*b7759904SNathan Huckleberry netdev_tx_t cvm_oct_xmit(struct sk_buff *skb, struct net_device *dev)
127422d97b8SChris Packham {
128422d97b8SChris Packham union cvmx_pko_command_word0 pko_command;
129422d97b8SChris Packham union cvmx_buf_ptr hw_buffer;
130422d97b8SChris Packham u64 old_scratch;
131422d97b8SChris Packham u64 old_scratch2;
132422d97b8SChris Packham int qos;
133422d97b8SChris Packham int i;
134422d97b8SChris Packham enum {QUEUE_CORE, QUEUE_HW, QUEUE_DROP} queue_type;
135422d97b8SChris Packham struct octeon_ethernet *priv = netdev_priv(dev);
136422d97b8SChris Packham struct sk_buff *to_free_list;
137422d97b8SChris Packham int skb_to_free;
138422d97b8SChris Packham int buffers_to_free;
139422d97b8SChris Packham u32 total_to_clean;
140422d97b8SChris Packham unsigned long flags;
141422d97b8SChris Packham #if REUSE_SKBUFFS_WITHOUT_FREE
142422d97b8SChris Packham unsigned char *fpa_head;
143422d97b8SChris Packham #endif
144422d97b8SChris Packham
145422d97b8SChris Packham /*
146422d97b8SChris Packham * Prefetch the private data structure. It is larger than the
147422d97b8SChris Packham * one cache line.
148422d97b8SChris Packham */
149422d97b8SChris Packham prefetch(priv);
150422d97b8SChris Packham
151422d97b8SChris Packham /*
152422d97b8SChris Packham * The check on CVMX_PKO_QUEUES_PER_PORT_* is designed to
153422d97b8SChris Packham * completely remove "qos" in the event neither interface
154422d97b8SChris Packham * supports multiple queues per port.
155422d97b8SChris Packham */
156422d97b8SChris Packham if ((CVMX_PKO_QUEUES_PER_PORT_INTERFACE0 > 1) ||
157422d97b8SChris Packham (CVMX_PKO_QUEUES_PER_PORT_INTERFACE1 > 1)) {
158422d97b8SChris Packham qos = GET_SKBUFF_QOS(skb);
159422d97b8SChris Packham if (qos <= 0)
160422d97b8SChris Packham qos = 0;
161422d97b8SChris Packham else if (qos >= cvmx_pko_get_num_queues(priv->port))
162422d97b8SChris Packham qos = 0;
163422d97b8SChris Packham } else {
164422d97b8SChris Packham qos = 0;
165422d97b8SChris Packham }
166422d97b8SChris Packham
167422d97b8SChris Packham if (USE_ASYNC_IOBDMA) {
168422d97b8SChris Packham /* Save scratch in case userspace is using it */
169422d97b8SChris Packham CVMX_SYNCIOBDMA;
170422d97b8SChris Packham old_scratch = cvmx_scratch_read64(CVMX_SCR_SCRATCH);
171422d97b8SChris Packham old_scratch2 = cvmx_scratch_read64(CVMX_SCR_SCRATCH + 8);
172422d97b8SChris Packham
173422d97b8SChris Packham /*
174422d97b8SChris Packham * Fetch and increment the number of packets to be
175422d97b8SChris Packham * freed.
176422d97b8SChris Packham */
177422d97b8SChris Packham cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH + 8,
178422d97b8SChris Packham FAU_NUM_PACKET_BUFFERS_TO_FREE,
179422d97b8SChris Packham 0);
180422d97b8SChris Packham cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH,
181422d97b8SChris Packham priv->fau + qos * 4,
182422d97b8SChris Packham MAX_SKB_TO_FREE);
183422d97b8SChris Packham }
184422d97b8SChris Packham
185422d97b8SChris Packham /*
186422d97b8SChris Packham * We have space for 6 segment pointers, If there will be more
187422d97b8SChris Packham * than that, we must linearize.
188422d97b8SChris Packham */
189422d97b8SChris Packham if (unlikely(skb_shinfo(skb)->nr_frags > 5)) {
190422d97b8SChris Packham if (unlikely(__skb_linearize(skb))) {
191422d97b8SChris Packham queue_type = QUEUE_DROP;
192422d97b8SChris Packham if (USE_ASYNC_IOBDMA) {
193422d97b8SChris Packham /*
194422d97b8SChris Packham * Get the number of skbuffs in use
195422d97b8SChris Packham * by the hardware
196422d97b8SChris Packham */
197422d97b8SChris Packham CVMX_SYNCIOBDMA;
198422d97b8SChris Packham skb_to_free =
199422d97b8SChris Packham cvmx_scratch_read64(CVMX_SCR_SCRATCH);
200422d97b8SChris Packham } else {
201422d97b8SChris Packham /*
202422d97b8SChris Packham * Get the number of skbuffs in use
203422d97b8SChris Packham * by the hardware
204422d97b8SChris Packham */
205422d97b8SChris Packham skb_to_free =
206422d97b8SChris Packham cvmx_fau_fetch_and_add32(priv->fau +
207422d97b8SChris Packham qos * 4,
208422d97b8SChris Packham MAX_SKB_TO_FREE);
209422d97b8SChris Packham }
210422d97b8SChris Packham skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free,
211422d97b8SChris Packham priv->fau +
212422d97b8SChris Packham qos * 4);
213422d97b8SChris Packham spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
214422d97b8SChris Packham goto skip_xmit;
215422d97b8SChris Packham }
216422d97b8SChris Packham }
217422d97b8SChris Packham
218422d97b8SChris Packham /*
219422d97b8SChris Packham * The CN3XXX series of parts has an errata (GMX-401) which
220422d97b8SChris Packham * causes the GMX block to hang if a collision occurs towards
221422d97b8SChris Packham * the end of a <68 byte packet. As a workaround for this, we
222422d97b8SChris Packham * pad packets to be 68 bytes whenever we are in half duplex
223422d97b8SChris Packham * mode. We don't handle the case of having a small packet but
224422d97b8SChris Packham * no room to add the padding. The kernel should always give
225422d97b8SChris Packham * us at least a cache line
226422d97b8SChris Packham */
227422d97b8SChris Packham if ((skb->len < 64) && OCTEON_IS_MODEL(OCTEON_CN3XXX)) {
228422d97b8SChris Packham union cvmx_gmxx_prtx_cfg gmx_prt_cfg;
229422d97b8SChris Packham int interface = INTERFACE(priv->port);
230422d97b8SChris Packham int index = INDEX(priv->port);
231422d97b8SChris Packham
232422d97b8SChris Packham if (interface < 2) {
233422d97b8SChris Packham /* We only need to pad packet in half duplex mode */
234422d97b8SChris Packham gmx_prt_cfg.u64 =
235422d97b8SChris Packham cvmx_read_csr(CVMX_GMXX_PRTX_CFG(index, interface));
236422d97b8SChris Packham if (gmx_prt_cfg.s.duplex == 0) {
237422d97b8SChris Packham int add_bytes = 64 - skb->len;
238422d97b8SChris Packham
239422d97b8SChris Packham if ((skb_tail_pointer(skb) + add_bytes) <=
240422d97b8SChris Packham skb_end_pointer(skb))
241422d97b8SChris Packham __skb_put_zero(skb, add_bytes);
242422d97b8SChris Packham }
243422d97b8SChris Packham }
244422d97b8SChris Packham }
245422d97b8SChris Packham
246422d97b8SChris Packham /* Build the PKO command */
247422d97b8SChris Packham pko_command.u64 = 0;
248422d97b8SChris Packham #ifdef __LITTLE_ENDIAN
249422d97b8SChris Packham pko_command.s.le = 1;
250422d97b8SChris Packham #endif
251422d97b8SChris Packham pko_command.s.n2 = 1; /* Don't pollute L2 with the outgoing packet */
252422d97b8SChris Packham pko_command.s.segs = 1;
253422d97b8SChris Packham pko_command.s.total_bytes = skb->len;
254422d97b8SChris Packham pko_command.s.size0 = CVMX_FAU_OP_SIZE_32;
255422d97b8SChris Packham pko_command.s.subone0 = 1;
256422d97b8SChris Packham
257422d97b8SChris Packham pko_command.s.dontfree = 1;
258422d97b8SChris Packham
259422d97b8SChris Packham /* Build the PKO buffer pointer */
260422d97b8SChris Packham hw_buffer.u64 = 0;
261422d97b8SChris Packham if (skb_shinfo(skb)->nr_frags == 0) {
262422d97b8SChris Packham hw_buffer.s.addr = XKPHYS_TO_PHYS((uintptr_t)skb->data);
263422d97b8SChris Packham hw_buffer.s.pool = 0;
264422d97b8SChris Packham hw_buffer.s.size = skb->len;
265422d97b8SChris Packham } else {
266422d97b8SChris Packham hw_buffer.s.addr = XKPHYS_TO_PHYS((uintptr_t)skb->data);
267422d97b8SChris Packham hw_buffer.s.pool = 0;
268422d97b8SChris Packham hw_buffer.s.size = skb_headlen(skb);
269422d97b8SChris Packham CVM_OCT_SKB_CB(skb)[0] = hw_buffer.u64;
270422d97b8SChris Packham for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
271422d97b8SChris Packham skb_frag_t *fs = skb_shinfo(skb)->frags + i;
272422d97b8SChris Packham
273422d97b8SChris Packham hw_buffer.s.addr =
274422d97b8SChris Packham XKPHYS_TO_PHYS((uintptr_t)skb_frag_address(fs));
275422d97b8SChris Packham hw_buffer.s.size = skb_frag_size(fs);
276422d97b8SChris Packham CVM_OCT_SKB_CB(skb)[i + 1] = hw_buffer.u64;
277422d97b8SChris Packham }
278422d97b8SChris Packham hw_buffer.s.addr =
279422d97b8SChris Packham XKPHYS_TO_PHYS((uintptr_t)CVM_OCT_SKB_CB(skb));
280422d97b8SChris Packham hw_buffer.s.size = skb_shinfo(skb)->nr_frags + 1;
281422d97b8SChris Packham pko_command.s.segs = skb_shinfo(skb)->nr_frags + 1;
282422d97b8SChris Packham pko_command.s.gather = 1;
283422d97b8SChris Packham goto dont_put_skbuff_in_hw;
284422d97b8SChris Packham }
285422d97b8SChris Packham
286422d97b8SChris Packham /*
287422d97b8SChris Packham * See if we can put this skb in the FPA pool. Any strange
288422d97b8SChris Packham * behavior from the Linux networking stack will most likely
289422d97b8SChris Packham * be caused by a bug in the following code. If some field is
290422d97b8SChris Packham * in use by the network stack and gets carried over when a
291422d97b8SChris Packham * buffer is reused, bad things may happen. If in doubt and
292422d97b8SChris Packham * you dont need the absolute best performance, disable the
293422d97b8SChris Packham * define REUSE_SKBUFFS_WITHOUT_FREE. The reuse of buffers has
294422d97b8SChris Packham * shown a 25% increase in performance under some loads.
295422d97b8SChris Packham */
296422d97b8SChris Packham #if REUSE_SKBUFFS_WITHOUT_FREE
297422d97b8SChris Packham fpa_head = skb->head + 256 - ((unsigned long)skb->head & 0x7f);
298422d97b8SChris Packham if (unlikely(skb->data < fpa_head)) {
299422d97b8SChris Packham /* TX buffer beginning can't meet FPA alignment constraints */
300422d97b8SChris Packham goto dont_put_skbuff_in_hw;
301422d97b8SChris Packham }
302422d97b8SChris Packham if (unlikely
303422d97b8SChris Packham ((skb_end_pointer(skb) - fpa_head) < CVMX_FPA_PACKET_POOL_SIZE)) {
304422d97b8SChris Packham /* TX buffer isn't large enough for the FPA */
305422d97b8SChris Packham goto dont_put_skbuff_in_hw;
306422d97b8SChris Packham }
307422d97b8SChris Packham if (unlikely(skb_shared(skb))) {
308422d97b8SChris Packham /* TX buffer sharing data with someone else */
309422d97b8SChris Packham goto dont_put_skbuff_in_hw;
310422d97b8SChris Packham }
311422d97b8SChris Packham if (unlikely(skb_cloned(skb))) {
312422d97b8SChris Packham /* TX buffer has been cloned */
313422d97b8SChris Packham goto dont_put_skbuff_in_hw;
314422d97b8SChris Packham }
315422d97b8SChris Packham if (unlikely(skb_header_cloned(skb))) {
316422d97b8SChris Packham /* TX buffer header has been cloned */
317422d97b8SChris Packham goto dont_put_skbuff_in_hw;
318422d97b8SChris Packham }
319422d97b8SChris Packham if (unlikely(skb->destructor)) {
320422d97b8SChris Packham /* TX buffer has a destructor */
321422d97b8SChris Packham goto dont_put_skbuff_in_hw;
322422d97b8SChris Packham }
323422d97b8SChris Packham if (unlikely(skb_shinfo(skb)->nr_frags)) {
324422d97b8SChris Packham /* TX buffer has fragments */
325422d97b8SChris Packham goto dont_put_skbuff_in_hw;
326422d97b8SChris Packham }
327422d97b8SChris Packham if (unlikely
328422d97b8SChris Packham (skb->truesize !=
329422d97b8SChris Packham sizeof(*skb) + skb_end_offset(skb))) {
330422d97b8SChris Packham /* TX buffer truesize has been changed */
331422d97b8SChris Packham goto dont_put_skbuff_in_hw;
332422d97b8SChris Packham }
333422d97b8SChris Packham
334422d97b8SChris Packham /*
335422d97b8SChris Packham * We can use this buffer in the FPA. We don't need the FAU
336422d97b8SChris Packham * update anymore
337422d97b8SChris Packham */
338422d97b8SChris Packham pko_command.s.dontfree = 0;
339422d97b8SChris Packham
340422d97b8SChris Packham hw_buffer.s.back = ((unsigned long)skb->data >> 7) -
341422d97b8SChris Packham ((unsigned long)fpa_head >> 7);
342422d97b8SChris Packham
343422d97b8SChris Packham *(struct sk_buff **)(fpa_head - sizeof(void *)) = skb;
344422d97b8SChris Packham
345422d97b8SChris Packham /*
346422d97b8SChris Packham * The skbuff will be reused without ever being freed. We must
347422d97b8SChris Packham * cleanup a bunch of core things.
348422d97b8SChris Packham */
349422d97b8SChris Packham dst_release(skb_dst(skb));
350422d97b8SChris Packham skb_dst_set(skb, NULL);
351422d97b8SChris Packham skb_ext_reset(skb);
352422d97b8SChris Packham nf_reset_ct(skb);
353673b41e0SRandy Dunlap skb_reset_redirect(skb);
354422d97b8SChris Packham
355422d97b8SChris Packham #ifdef CONFIG_NET_SCHED
356422d97b8SChris Packham skb->tc_index = 0;
357422d97b8SChris Packham #endif /* CONFIG_NET_SCHED */
358422d97b8SChris Packham #endif /* REUSE_SKBUFFS_WITHOUT_FREE */
359422d97b8SChris Packham
360422d97b8SChris Packham dont_put_skbuff_in_hw:
361422d97b8SChris Packham
362422d97b8SChris Packham /* Check if we can use the hardware checksumming */
363422d97b8SChris Packham if ((skb->protocol == htons(ETH_P_IP)) &&
364422d97b8SChris Packham (ip_hdr(skb)->version == 4) &&
365422d97b8SChris Packham (ip_hdr(skb)->ihl == 5) &&
366422d97b8SChris Packham ((ip_hdr(skb)->frag_off == 0) ||
367422d97b8SChris Packham (ip_hdr(skb)->frag_off == htons(1 << 14))) &&
368422d97b8SChris Packham ((ip_hdr(skb)->protocol == IPPROTO_TCP) ||
369422d97b8SChris Packham (ip_hdr(skb)->protocol == IPPROTO_UDP))) {
370422d97b8SChris Packham /* Use hardware checksum calc */
371422d97b8SChris Packham pko_command.s.ipoffp1 = skb_network_offset(skb) + 1;
372422d97b8SChris Packham }
373422d97b8SChris Packham
374422d97b8SChris Packham if (USE_ASYNC_IOBDMA) {
375422d97b8SChris Packham /* Get the number of skbuffs in use by the hardware */
376422d97b8SChris Packham CVMX_SYNCIOBDMA;
377422d97b8SChris Packham skb_to_free = cvmx_scratch_read64(CVMX_SCR_SCRATCH);
378422d97b8SChris Packham buffers_to_free = cvmx_scratch_read64(CVMX_SCR_SCRATCH + 8);
379422d97b8SChris Packham } else {
380422d97b8SChris Packham /* Get the number of skbuffs in use by the hardware */
381422d97b8SChris Packham skb_to_free = cvmx_fau_fetch_and_add32(priv->fau + qos * 4,
382422d97b8SChris Packham MAX_SKB_TO_FREE);
383422d97b8SChris Packham buffers_to_free =
384422d97b8SChris Packham cvmx_fau_fetch_and_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE, 0);
385422d97b8SChris Packham }
386422d97b8SChris Packham
387422d97b8SChris Packham skb_to_free = cvm_oct_adjust_skb_to_free(skb_to_free,
388422d97b8SChris Packham priv->fau + qos * 4);
389422d97b8SChris Packham
390422d97b8SChris Packham /*
391422d97b8SChris Packham * If we're sending faster than the receive can free them then
392422d97b8SChris Packham * don't do the HW free.
393422d97b8SChris Packham */
394422d97b8SChris Packham if ((buffers_to_free < -100) && !pko_command.s.dontfree)
395422d97b8SChris Packham pko_command.s.dontfree = 1;
396422d97b8SChris Packham
397422d97b8SChris Packham if (pko_command.s.dontfree) {
398422d97b8SChris Packham queue_type = QUEUE_CORE;
399422d97b8SChris Packham pko_command.s.reg0 = priv->fau + qos * 4;
400422d97b8SChris Packham } else {
401422d97b8SChris Packham queue_type = QUEUE_HW;
402422d97b8SChris Packham }
403422d97b8SChris Packham if (USE_ASYNC_IOBDMA)
404422d97b8SChris Packham cvmx_fau_async_fetch_and_add32(CVMX_SCR_SCRATCH,
405422d97b8SChris Packham FAU_TOTAL_TX_TO_CLEAN, 1);
406422d97b8SChris Packham
407422d97b8SChris Packham spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
408422d97b8SChris Packham
409422d97b8SChris Packham /* Drop this packet if we have too many already queued to the HW */
410422d97b8SChris Packham if (unlikely(skb_queue_len(&priv->tx_free_list[qos]) >=
411422d97b8SChris Packham MAX_OUT_QUEUE_DEPTH)) {
412422d97b8SChris Packham if (dev->tx_queue_len != 0) {
413422d97b8SChris Packham /* Drop the lock when notifying the core. */
414422d97b8SChris Packham spin_unlock_irqrestore(&priv->tx_free_list[qos].lock,
415422d97b8SChris Packham flags);
416422d97b8SChris Packham netif_stop_queue(dev);
417422d97b8SChris Packham spin_lock_irqsave(&priv->tx_free_list[qos].lock,
418422d97b8SChris Packham flags);
419422d97b8SChris Packham } else {
420422d97b8SChris Packham /* If not using normal queueing. */
421422d97b8SChris Packham queue_type = QUEUE_DROP;
422422d97b8SChris Packham goto skip_xmit;
423422d97b8SChris Packham }
424422d97b8SChris Packham }
425422d97b8SChris Packham
426422d97b8SChris Packham cvmx_pko_send_packet_prepare(priv->port, priv->queue + qos,
427422d97b8SChris Packham CVMX_PKO_LOCK_NONE);
428422d97b8SChris Packham
429422d97b8SChris Packham /* Send the packet to the output queue */
430422d97b8SChris Packham if (unlikely(cvmx_pko_send_packet_finish(priv->port,
431422d97b8SChris Packham priv->queue + qos,
432422d97b8SChris Packham pko_command, hw_buffer,
433422d97b8SChris Packham CVMX_PKO_LOCK_NONE))) {
434422d97b8SChris Packham printk_ratelimited("%s: Failed to send the packet\n",
435422d97b8SChris Packham dev->name);
436422d97b8SChris Packham queue_type = QUEUE_DROP;
437422d97b8SChris Packham }
438422d97b8SChris Packham skip_xmit:
439422d97b8SChris Packham to_free_list = NULL;
440422d97b8SChris Packham
441422d97b8SChris Packham switch (queue_type) {
442422d97b8SChris Packham case QUEUE_DROP:
443422d97b8SChris Packham skb->next = to_free_list;
444422d97b8SChris Packham to_free_list = skb;
445422d97b8SChris Packham dev->stats.tx_dropped++;
446422d97b8SChris Packham break;
447422d97b8SChris Packham case QUEUE_HW:
448422d97b8SChris Packham cvmx_fau_atomic_add32(FAU_NUM_PACKET_BUFFERS_TO_FREE, -1);
449422d97b8SChris Packham break;
450422d97b8SChris Packham case QUEUE_CORE:
451422d97b8SChris Packham __skb_queue_tail(&priv->tx_free_list[qos], skb);
452422d97b8SChris Packham break;
453422d97b8SChris Packham default:
454422d97b8SChris Packham BUG();
455422d97b8SChris Packham }
456422d97b8SChris Packham
457422d97b8SChris Packham while (skb_to_free > 0) {
458422d97b8SChris Packham struct sk_buff *t = __skb_dequeue(&priv->tx_free_list[qos]);
459422d97b8SChris Packham
460422d97b8SChris Packham t->next = to_free_list;
461422d97b8SChris Packham to_free_list = t;
462422d97b8SChris Packham skb_to_free--;
463422d97b8SChris Packham }
464422d97b8SChris Packham
465422d97b8SChris Packham spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, flags);
466422d97b8SChris Packham
467422d97b8SChris Packham /* Do the actual freeing outside of the lock. */
468422d97b8SChris Packham while (to_free_list) {
469422d97b8SChris Packham struct sk_buff *t = to_free_list;
470422d97b8SChris Packham
471422d97b8SChris Packham to_free_list = to_free_list->next;
472422d97b8SChris Packham dev_kfree_skb_any(t);
473422d97b8SChris Packham }
474422d97b8SChris Packham
475422d97b8SChris Packham if (USE_ASYNC_IOBDMA) {
476422d97b8SChris Packham CVMX_SYNCIOBDMA;
477422d97b8SChris Packham total_to_clean = cvmx_scratch_read64(CVMX_SCR_SCRATCH);
478422d97b8SChris Packham /* Restore the scratch area */
479422d97b8SChris Packham cvmx_scratch_write64(CVMX_SCR_SCRATCH, old_scratch);
480422d97b8SChris Packham cvmx_scratch_write64(CVMX_SCR_SCRATCH + 8, old_scratch2);
481422d97b8SChris Packham } else {
482422d97b8SChris Packham total_to_clean =
483422d97b8SChris Packham cvmx_fau_fetch_and_add32(FAU_TOTAL_TX_TO_CLEAN, 1);
484422d97b8SChris Packham }
485422d97b8SChris Packham
486422d97b8SChris Packham if (total_to_clean & 0x3ff) {
487422d97b8SChris Packham /*
488422d97b8SChris Packham * Schedule the cleanup tasklet every 1024 packets for
489422d97b8SChris Packham * the pathological case of high traffic on one port
490422d97b8SChris Packham * delaying clean up of packets on a different port
491422d97b8SChris Packham * that is blocked waiting for the cleanup.
492422d97b8SChris Packham */
493422d97b8SChris Packham tasklet_schedule(&cvm_oct_tx_cleanup_tasklet);
494422d97b8SChris Packham }
495422d97b8SChris Packham
496422d97b8SChris Packham cvm_oct_kick_tx_poll_watchdog();
497422d97b8SChris Packham
498422d97b8SChris Packham return NETDEV_TX_OK;
499422d97b8SChris Packham }
500422d97b8SChris Packham
501422d97b8SChris Packham /**
502422d97b8SChris Packham * cvm_oct_xmit_pow - transmit a packet to the POW
503422d97b8SChris Packham * @skb: Packet to send
504422d97b8SChris Packham * @dev: Device info structure
505422d97b8SChris Packham * Returns Always returns zero
506422d97b8SChris Packham */
cvm_oct_xmit_pow(struct sk_buff * skb,struct net_device * dev)507*b7759904SNathan Huckleberry netdev_tx_t cvm_oct_xmit_pow(struct sk_buff *skb, struct net_device *dev)
508422d97b8SChris Packham {
509422d97b8SChris Packham struct octeon_ethernet *priv = netdev_priv(dev);
510422d97b8SChris Packham void *packet_buffer;
511422d97b8SChris Packham void *copy_location;
512422d97b8SChris Packham
513422d97b8SChris Packham /* Get a work queue entry */
514422d97b8SChris Packham struct cvmx_wqe *work = cvmx_fpa_alloc(CVMX_FPA_WQE_POOL);
515422d97b8SChris Packham
516422d97b8SChris Packham if (unlikely(!work)) {
517422d97b8SChris Packham printk_ratelimited("%s: Failed to allocate a work queue entry\n",
518422d97b8SChris Packham dev->name);
519422d97b8SChris Packham dev->stats.tx_dropped++;
520422d97b8SChris Packham dev_kfree_skb_any(skb);
521422d97b8SChris Packham return 0;
522422d97b8SChris Packham }
523422d97b8SChris Packham
524422d97b8SChris Packham /* Get a packet buffer */
525422d97b8SChris Packham packet_buffer = cvmx_fpa_alloc(CVMX_FPA_PACKET_POOL);
526422d97b8SChris Packham if (unlikely(!packet_buffer)) {
527422d97b8SChris Packham printk_ratelimited("%s: Failed to allocate a packet buffer\n",
528422d97b8SChris Packham dev->name);
529422d97b8SChris Packham cvmx_fpa_free(work, CVMX_FPA_WQE_POOL, 1);
530422d97b8SChris Packham dev->stats.tx_dropped++;
531422d97b8SChris Packham dev_kfree_skb_any(skb);
532422d97b8SChris Packham return 0;
533422d97b8SChris Packham }
534422d97b8SChris Packham
535422d97b8SChris Packham /*
536422d97b8SChris Packham * Calculate where we need to copy the data to. We need to
537422d97b8SChris Packham * leave 8 bytes for a next pointer (unused). We also need to
538422d97b8SChris Packham * include any configure skip. Then we need to align the IP
539422d97b8SChris Packham * packet src and dest into the same 64bit word. The below
540422d97b8SChris Packham * calculation may add a little extra, but that doesn't
541422d97b8SChris Packham * hurt.
542422d97b8SChris Packham */
543422d97b8SChris Packham copy_location = packet_buffer + sizeof(u64);
544422d97b8SChris Packham copy_location += ((CVMX_HELPER_FIRST_MBUFF_SKIP + 7) & 0xfff8) + 6;
545422d97b8SChris Packham
546422d97b8SChris Packham /*
547422d97b8SChris Packham * We have to copy the packet since whoever processes this
548422d97b8SChris Packham * packet will free it to a hardware pool. We can't use the
549422d97b8SChris Packham * trick of counting outstanding packets like in
550422d97b8SChris Packham * cvm_oct_xmit.
551422d97b8SChris Packham */
552422d97b8SChris Packham memcpy(copy_location, skb->data, skb->len);
553422d97b8SChris Packham
554422d97b8SChris Packham /*
555422d97b8SChris Packham * Fill in some of the work queue fields. We may need to add
556422d97b8SChris Packham * more if the software at the other end needs them.
557422d97b8SChris Packham */
558422d97b8SChris Packham if (!OCTEON_IS_MODEL(OCTEON_CN68XX))
559422d97b8SChris Packham work->word0.pip.cn38xx.hw_chksum = skb->csum;
560422d97b8SChris Packham work->word1.len = skb->len;
561422d97b8SChris Packham cvmx_wqe_set_port(work, priv->port);
562422d97b8SChris Packham cvmx_wqe_set_qos(work, priv->port & 0x7);
563422d97b8SChris Packham cvmx_wqe_set_grp(work, pow_send_group);
564422d97b8SChris Packham work->word1.tag_type = CVMX_HELPER_INPUT_TAG_TYPE;
565422d97b8SChris Packham work->word1.tag = pow_send_group; /* FIXME */
566422d97b8SChris Packham /* Default to zero. Sets of zero later are commented out */
567422d97b8SChris Packham work->word2.u64 = 0;
568422d97b8SChris Packham work->word2.s.bufs = 1;
569422d97b8SChris Packham work->packet_ptr.u64 = 0;
570422d97b8SChris Packham work->packet_ptr.s.addr = cvmx_ptr_to_phys(copy_location);
571422d97b8SChris Packham work->packet_ptr.s.pool = CVMX_FPA_PACKET_POOL;
572422d97b8SChris Packham work->packet_ptr.s.size = CVMX_FPA_PACKET_POOL_SIZE;
573422d97b8SChris Packham work->packet_ptr.s.back = (copy_location - packet_buffer) >> 7;
574422d97b8SChris Packham
575422d97b8SChris Packham if (skb->protocol == htons(ETH_P_IP)) {
576422d97b8SChris Packham work->word2.s.ip_offset = 14;
577422d97b8SChris Packham #if 0
578422d97b8SChris Packham work->word2.s.vlan_valid = 0; /* FIXME */
579422d97b8SChris Packham work->word2.s.vlan_cfi = 0; /* FIXME */
580422d97b8SChris Packham work->word2.s.vlan_id = 0; /* FIXME */
581422d97b8SChris Packham work->word2.s.dec_ipcomp = 0; /* FIXME */
582422d97b8SChris Packham #endif
583422d97b8SChris Packham work->word2.s.tcp_or_udp =
584422d97b8SChris Packham (ip_hdr(skb)->protocol == IPPROTO_TCP) ||
585422d97b8SChris Packham (ip_hdr(skb)->protocol == IPPROTO_UDP);
586422d97b8SChris Packham #if 0
587422d97b8SChris Packham /* FIXME */
588422d97b8SChris Packham work->word2.s.dec_ipsec = 0;
589422d97b8SChris Packham /* We only support IPv4 right now */
590422d97b8SChris Packham work->word2.s.is_v6 = 0;
591422d97b8SChris Packham /* Hardware would set to zero */
592422d97b8SChris Packham work->word2.s.software = 0;
593422d97b8SChris Packham /* No error, packet is internal */
594422d97b8SChris Packham work->word2.s.L4_error = 0;
595422d97b8SChris Packham #endif
596422d97b8SChris Packham work->word2.s.is_frag = !((ip_hdr(skb)->frag_off == 0) ||
597422d97b8SChris Packham (ip_hdr(skb)->frag_off ==
598422d97b8SChris Packham cpu_to_be16(1 << 14)));
599422d97b8SChris Packham #if 0
600422d97b8SChris Packham /* Assume Linux is sending a good packet */
601422d97b8SChris Packham work->word2.s.IP_exc = 0;
602422d97b8SChris Packham #endif
603422d97b8SChris Packham work->word2.s.is_bcast = (skb->pkt_type == PACKET_BROADCAST);
604422d97b8SChris Packham work->word2.s.is_mcast = (skb->pkt_type == PACKET_MULTICAST);
605422d97b8SChris Packham #if 0
606422d97b8SChris Packham /* This is an IP packet */
607422d97b8SChris Packham work->word2.s.not_IP = 0;
608422d97b8SChris Packham /* No error, packet is internal */
609422d97b8SChris Packham work->word2.s.rcv_error = 0;
610422d97b8SChris Packham /* No error, packet is internal */
611422d97b8SChris Packham work->word2.s.err_code = 0;
612422d97b8SChris Packham #endif
613422d97b8SChris Packham
614422d97b8SChris Packham /*
615422d97b8SChris Packham * When copying the data, include 4 bytes of the
616422d97b8SChris Packham * ethernet header to align the same way hardware
617422d97b8SChris Packham * does.
618422d97b8SChris Packham */
619422d97b8SChris Packham memcpy(work->packet_data, skb->data + 10,
620422d97b8SChris Packham sizeof(work->packet_data));
621422d97b8SChris Packham } else {
622422d97b8SChris Packham #if 0
623422d97b8SChris Packham work->word2.snoip.vlan_valid = 0; /* FIXME */
624422d97b8SChris Packham work->word2.snoip.vlan_cfi = 0; /* FIXME */
625422d97b8SChris Packham work->word2.snoip.vlan_id = 0; /* FIXME */
626422d97b8SChris Packham work->word2.snoip.software = 0; /* Hardware would set to zero */
627422d97b8SChris Packham #endif
628422d97b8SChris Packham work->word2.snoip.is_rarp = skb->protocol == htons(ETH_P_RARP);
629422d97b8SChris Packham work->word2.snoip.is_arp = skb->protocol == htons(ETH_P_ARP);
630422d97b8SChris Packham work->word2.snoip.is_bcast =
631422d97b8SChris Packham (skb->pkt_type == PACKET_BROADCAST);
632422d97b8SChris Packham work->word2.snoip.is_mcast =
633422d97b8SChris Packham (skb->pkt_type == PACKET_MULTICAST);
634422d97b8SChris Packham work->word2.snoip.not_IP = 1; /* IP was done up above */
635422d97b8SChris Packham #if 0
636422d97b8SChris Packham /* No error, packet is internal */
637422d97b8SChris Packham work->word2.snoip.rcv_error = 0;
638422d97b8SChris Packham /* No error, packet is internal */
639422d97b8SChris Packham work->word2.snoip.err_code = 0;
640422d97b8SChris Packham #endif
641422d97b8SChris Packham memcpy(work->packet_data, skb->data, sizeof(work->packet_data));
642422d97b8SChris Packham }
643422d97b8SChris Packham
644422d97b8SChris Packham /* Submit the packet to the POW */
645422d97b8SChris Packham cvmx_pow_work_submit(work, work->word1.tag, work->word1.tag_type,
646422d97b8SChris Packham cvmx_wqe_get_qos(work), cvmx_wqe_get_grp(work));
647422d97b8SChris Packham dev->stats.tx_packets++;
648422d97b8SChris Packham dev->stats.tx_bytes += skb->len;
649422d97b8SChris Packham dev_consume_skb_any(skb);
650422d97b8SChris Packham return 0;
651422d97b8SChris Packham }
652422d97b8SChris Packham
653422d97b8SChris Packham /**
654422d97b8SChris Packham * cvm_oct_tx_shutdown_dev - free all skb that are currently queued for TX.
655422d97b8SChris Packham * @dev: Device being shutdown
656422d97b8SChris Packham *
657422d97b8SChris Packham */
cvm_oct_tx_shutdown_dev(struct net_device * dev)658422d97b8SChris Packham void cvm_oct_tx_shutdown_dev(struct net_device *dev)
659422d97b8SChris Packham {
660422d97b8SChris Packham struct octeon_ethernet *priv = netdev_priv(dev);
661422d97b8SChris Packham unsigned long flags;
662422d97b8SChris Packham int qos;
663422d97b8SChris Packham
664422d97b8SChris Packham for (qos = 0; qos < 16; qos++) {
665422d97b8SChris Packham spin_lock_irqsave(&priv->tx_free_list[qos].lock, flags);
666422d97b8SChris Packham while (skb_queue_len(&priv->tx_free_list[qos]))
667422d97b8SChris Packham dev_kfree_skb_any(__skb_dequeue
668422d97b8SChris Packham (&priv->tx_free_list[qos]));
669422d97b8SChris Packham spin_unlock_irqrestore(&priv->tx_free_list[qos].lock, flags);
670422d97b8SChris Packham }
671422d97b8SChris Packham }
672422d97b8SChris Packham
cvm_oct_tx_do_cleanup(unsigned long arg)673422d97b8SChris Packham static void cvm_oct_tx_do_cleanup(unsigned long arg)
674422d97b8SChris Packham {
675422d97b8SChris Packham int port;
676422d97b8SChris Packham
677422d97b8SChris Packham for (port = 0; port < TOTAL_NUMBER_OF_PORTS; port++) {
678422d97b8SChris Packham if (cvm_oct_device[port]) {
679422d97b8SChris Packham struct net_device *dev = cvm_oct_device[port];
680422d97b8SChris Packham
681422d97b8SChris Packham cvm_oct_free_tx_skbs(dev);
682422d97b8SChris Packham }
683422d97b8SChris Packham }
684422d97b8SChris Packham }
685422d97b8SChris Packham
cvm_oct_tx_cleanup_watchdog(int cpl,void * dev_id)686422d97b8SChris Packham static irqreturn_t cvm_oct_tx_cleanup_watchdog(int cpl, void *dev_id)
687422d97b8SChris Packham {
688422d97b8SChris Packham /* Disable the interrupt. */
689422d97b8SChris Packham cvmx_write_csr(CVMX_CIU_TIMX(1), 0);
690422d97b8SChris Packham /* Do the work in the tasklet. */
691422d97b8SChris Packham tasklet_schedule(&cvm_oct_tx_cleanup_tasklet);
692422d97b8SChris Packham return IRQ_HANDLED;
693422d97b8SChris Packham }
694422d97b8SChris Packham
cvm_oct_tx_initialize(void)695422d97b8SChris Packham void cvm_oct_tx_initialize(void)
696422d97b8SChris Packham {
697422d97b8SChris Packham int i;
698422d97b8SChris Packham
699422d97b8SChris Packham /* Disable the interrupt. */
700422d97b8SChris Packham cvmx_write_csr(CVMX_CIU_TIMX(1), 0);
701422d97b8SChris Packham /* Register an IRQ handler to receive CIU_TIMX(1) interrupts */
702422d97b8SChris Packham i = request_irq(OCTEON_IRQ_TIMER1,
703422d97b8SChris Packham cvm_oct_tx_cleanup_watchdog, 0,
704422d97b8SChris Packham "Ethernet", cvm_oct_device);
705422d97b8SChris Packham
706422d97b8SChris Packham if (i)
707422d97b8SChris Packham panic("Could not acquire Ethernet IRQ %d\n", OCTEON_IRQ_TIMER1);
708422d97b8SChris Packham }
709422d97b8SChris Packham
cvm_oct_tx_shutdown(void)710422d97b8SChris Packham void cvm_oct_tx_shutdown(void)
711422d97b8SChris Packham {
712422d97b8SChris Packham /* Free the interrupt handler */
713422d97b8SChris Packham free_irq(OCTEON_IRQ_TIMER1, cvm_oct_device);
714422d97b8SChris Packham }
715