tree: https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git
master
head: 22942498ccebf13b076859f8746be161dc0c6d89
commit: d398231219116da5697bbe090e478dd68a2259ed [58/94] enetc: add hardware
timestamping support
reproduce:
# apt-get install sparse
# sparse version: v0.6.1-rc1-7-g2b96cd8-dirty
git checkout d398231219116da5697bbe090e478dd68a2259ed
make ARCH=x86_64 allmodconfig
make C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__'
If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <l...@intel.com>
sparse warnings: (new ones prefixed by >>)
>> drivers/net/ethernet/freescale/enetc/enetc.c:314:27: sparse: sparse:
>> restricted __le32 degrades to integer
drivers/net/ethernet/freescale/enetc/enetc.c:316:43: sparse: sparse:
restricted __le32 degrades to integer
>> drivers/net/ethernet/freescale/enetc/enetc.c:489:20: sparse: sparse:
>> restricted __le16 degrades to integer
drivers/net/ethernet/freescale/enetc/enetc.c:492:34: sparse: sparse:
restricted __le32 degrades to integer
drivers/net/ethernet/freescale/enetc/enetc.c:495:49: sparse: sparse:
restricted __le32 degrades to integer
vim +314 drivers/net/ethernet/freescale/enetc/enetc.c
306
307 static void enetc_get_tx_tstamp(struct enetc_hw *hw, union enetc_tx_bd
*txbd,
308 u64 *tstamp)
309 {
310 u32 lo, hi;
311
312 lo = enetc_rd(hw, ENETC_SICTR0);
313 hi = enetc_rd(hw, ENETC_SICTR1);
> 314 if (lo <= txbd->wb.tstamp)
315 hi -= 1;
316 *tstamp = (u64)hi << 32 | txbd->wb.tstamp;
317 }
318
319 static void enetc_tstamp_tx(struct sk_buff *skb, u64 tstamp)
320 {
321 struct skb_shared_hwtstamps shhwtstamps;
322
323 if (skb_shinfo(skb)->tx_flags & SKBTX_IN_PROGRESS) {
324 memset(&shhwtstamps, 0, sizeof(shhwtstamps));
325 shhwtstamps.hwtstamp = ns_to_ktime(tstamp);
326 skb_tstamp_tx(skb, &shhwtstamps);
327 }
328 }
329
330 static bool enetc_clean_tx_ring(struct enetc_bdr *tx_ring, int
napi_budget)
331 {
332 struct net_device *ndev = tx_ring->ndev;
333 int tx_frm_cnt = 0, tx_byte_cnt = 0;
334 struct enetc_tx_swbd *tx_swbd;
335 int i, bds_to_clean;
336 bool do_tstamp;
337 u64 tstamp = 0;
338
339 i = tx_ring->next_to_clean;
340 tx_swbd = &tx_ring->tx_swbd[i];
341 bds_to_clean = enetc_bd_ready_count(tx_ring, i);
342
343 do_tstamp = false;
344
345 while (bds_to_clean && tx_frm_cnt < ENETC_DEFAULT_TX_WORK) {
346 bool is_eof = !!tx_swbd->skb;
347
348 if (unlikely(tx_swbd->check_wb)) {
349 struct enetc_ndev_priv *priv =
netdev_priv(ndev);
350 union enetc_tx_bd *txbd;
351
352 txbd = ENETC_TXBD(*tx_ring, i);
353
354 if (txbd->flags & ENETC_TXBD_FLAGS_W &&
355 tx_swbd->do_tstamp) {
356 enetc_get_tx_tstamp(&priv->si->hw, txbd,
357 &tstamp);
358 do_tstamp = true;
359 }
360 }
361
362 if (likely(tx_swbd->dma))
363 enetc_unmap_tx_buff(tx_ring, tx_swbd);
364
365 if (is_eof) {
366 if (unlikely(do_tstamp)) {
367 enetc_tstamp_tx(tx_swbd->skb, tstamp);
368 do_tstamp = false;
369 }
370 napi_consume_skb(tx_swbd->skb, napi_budget);
371 tx_swbd->skb = NULL;
372 }
373
374 tx_byte_cnt += tx_swbd->len;
375
376 bds_to_clean--;
377 tx_swbd++;
378 i++;
379 if (unlikely(i == tx_ring->bd_count)) {
380 i = 0;
381 tx_swbd = tx_ring->tx_swbd;
382 }
383
384 /* BD iteration loop end */
385 if (is_eof) {
386 tx_frm_cnt++;
387 /* re-arm interrupt source */
388 enetc_wr_reg(tx_ring->idr, BIT(tx_ring->index) |
389 BIT(16 + tx_ring->index));
390 }
391
392 if (unlikely(!bds_to_clean))
393 bds_to_clean = enetc_bd_ready_count(tx_ring, i);
394 }
395
396 tx_ring->next_to_clean = i;
397 tx_ring->stats.packets += tx_frm_cnt;
398 tx_ring->stats.bytes += tx_byte_cnt;
399
400 if (unlikely(tx_frm_cnt && netif_carrier_ok(ndev) &&
401 __netif_subqueue_stopped(ndev, tx_ring->index) &&
402 (enetc_bd_unused(tx_ring) >=
ENETC_TXBDS_MAX_NEEDED))) {
403 netif_wake_subqueue(ndev, tx_ring->index);
404 }
405
406 return tx_frm_cnt != ENETC_DEFAULT_TX_WORK;
407 }
408
409 static bool enetc_new_page(struct enetc_bdr *rx_ring,
410 struct enetc_rx_swbd *rx_swbd)
411 {
412 struct page *page;
413 dma_addr_t addr;
414
415 page = dev_alloc_page();
416 if (unlikely(!page))
417 return false;
418
419 addr = dma_map_page(rx_ring->dev, page, 0, PAGE_SIZE,
DMA_FROM_DEVICE);
420 if (unlikely(dma_mapping_error(rx_ring->dev, addr))) {
421 __free_page(page);
422
423 return false;
424 }
425
426 rx_swbd->dma = addr;
427 rx_swbd->page = page;
428 rx_swbd->page_offset = ENETC_RXB_PAD;
429
430 return true;
431 }
432
433 static int enetc_refill_rx_ring(struct enetc_bdr *rx_ring, const int
buff_cnt)
434 {
435 struct enetc_rx_swbd *rx_swbd;
436 union enetc_rx_bd *rxbd;
437 int i, j;
438
439 i = rx_ring->next_to_use;
440 rx_swbd = &rx_ring->rx_swbd[i];
441 rxbd = ENETC_RXBD(*rx_ring, i);
442
443 for (j = 0; j < buff_cnt; j++) {
444 /* try reuse page */
445 if (unlikely(!rx_swbd->page)) {
446 if (unlikely(!enetc_new_page(rx_ring,
rx_swbd))) {
447 rx_ring->stats.rx_alloc_errs++;
448 break;
449 }
450 }
451
452 /* update RxBD */
453 rxbd->w.addr = cpu_to_le64(rx_swbd->dma +
454 rx_swbd->page_offset);
455 /* clear 'R" as well */
456 rxbd->r.lstatus = 0;
457
458 rx_swbd++;
459 rxbd++;
460 i++;
461 if (unlikely(i == rx_ring->bd_count)) {
462 i = 0;
463 rx_swbd = rx_ring->rx_swbd;
464 rxbd = ENETC_RXBD(*rx_ring, 0);
465 }
466 }
467
468 if (likely(j)) {
469 rx_ring->next_to_alloc = i; /* keep track from page
reuse */
470 rx_ring->next_to_use = i;
471 /* update ENETC's consumer index */
472 enetc_wr_reg(rx_ring->rcir, i);
473 }
474
475 return j;
476 }
477
478 #ifdef CONFIG_FSL_ENETC_HW_TIMESTAMPING
479 static void enetc_get_rx_tstamp(struct net_device *ndev,
480 union enetc_rx_bd *rxbd,
481 struct sk_buff *skb)
482 {
483 struct skb_shared_hwtstamps *shhwtstamps = skb_hwtstamps(skb);
484 struct enetc_ndev_priv *priv = netdev_priv(ndev);
485 struct enetc_hw *hw = &priv->si->hw;
486 u32 lo, hi;
487 u64 tstamp;
488
> 489 if (rxbd->r.flags & ENETC_RXBD_FLAG_TSTMP) {
490 lo = enetc_rd(hw, ENETC_SICTR0);
491 hi = enetc_rd(hw, ENETC_SICTR1);
492 if (lo <= rxbd->r.tstamp)
493 hi -= 1;
494
495 tstamp = (u64)hi << 32 | rxbd->r.tstamp;
496 memset(shhwtstamps, 0, sizeof(*shhwtstamps));
497 shhwtstamps->hwtstamp = ns_to_ktime(tstamp);
498 }
499 }
500 #endif
501
---
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