#include "wx_type.h"
#include "wx_lib.h"
+#include "wx_hw.h"
+
+/* wx_test_staterr - tests bits in Rx descriptor status and error fields */
+static __le32 wx_test_staterr(union wx_rx_desc *rx_desc,
+ const u32 stat_err_bits)
+{
+ return rx_desc->wb.upper.status_error & cpu_to_le32(stat_err_bits);
+}
+
+static bool wx_can_reuse_rx_page(struct wx_rx_buffer *rx_buffer,
+ int rx_buffer_pgcnt)
+{
+ unsigned int pagecnt_bias = rx_buffer->pagecnt_bias;
+ struct page *page = rx_buffer->page;
+
+ /* avoid re-using remote and pfmemalloc pages */
+ if (!dev_page_is_reusable(page))
+ return false;
+
+#if (PAGE_SIZE < 8192)
+ /* if we are only owner of page we can reuse it */
+ if (unlikely((rx_buffer_pgcnt - pagecnt_bias) > 1))
+ return false;
+#endif
+
+ /* If we have drained the page fragment pool we need to update
+ * the pagecnt_bias and page count so that we fully restock the
+ * number of references the driver holds.
+ */
+ if (unlikely(pagecnt_bias == 1)) {
+ page_ref_add(page, USHRT_MAX - 1);
+ rx_buffer->pagecnt_bias = USHRT_MAX;
+ }
+
+ return true;
+}
+
+/**
+ * wx_reuse_rx_page - page flip buffer and store it back on the ring
+ * @rx_ring: rx descriptor ring to store buffers on
+ * @old_buff: donor buffer to have page reused
+ *
+ * Synchronizes page for reuse by the adapter
+ **/
+static void wx_reuse_rx_page(struct wx_ring *rx_ring,
+ struct wx_rx_buffer *old_buff)
+{
+ u16 nta = rx_ring->next_to_alloc;
+ struct wx_rx_buffer *new_buff;
+
+ new_buff = &rx_ring->rx_buffer_info[nta];
+
+ /* update, and store next to alloc */
+ nta++;
+ rx_ring->next_to_alloc = (nta < rx_ring->count) ? nta : 0;
+
+ /* transfer page from old buffer to new buffer */
+ new_buff->page = old_buff->page;
+ new_buff->page_dma = old_buff->page_dma;
+ new_buff->page_offset = old_buff->page_offset;
+ new_buff->pagecnt_bias = old_buff->pagecnt_bias;
+}
+
+static void wx_dma_sync_frag(struct wx_ring *rx_ring,
+ struct wx_rx_buffer *rx_buffer)
+{
+ struct sk_buff *skb = rx_buffer->skb;
+ skb_frag_t *frag = &skb_shinfo(skb)->frags[0];
+
+ dma_sync_single_range_for_cpu(rx_ring->dev,
+ WX_CB(skb)->dma,
+ skb_frag_off(frag),
+ skb_frag_size(frag),
+ DMA_FROM_DEVICE);
+
+ /* If the page was released, just unmap it. */
+ if (unlikely(WX_CB(skb)->page_released))
+ page_pool_put_full_page(rx_ring->page_pool, rx_buffer->page, false);
+}
+
+static struct wx_rx_buffer *wx_get_rx_buffer(struct wx_ring *rx_ring,
+ union wx_rx_desc *rx_desc,
+ struct sk_buff **skb,
+ int *rx_buffer_pgcnt)
+{
+ struct wx_rx_buffer *rx_buffer;
+ unsigned int size;
+
+ rx_buffer = &rx_ring->rx_buffer_info[rx_ring->next_to_clean];
+ size = le16_to_cpu(rx_desc->wb.upper.length);
+
+#if (PAGE_SIZE < 8192)
+ *rx_buffer_pgcnt = page_count(rx_buffer->page);
+#else
+ *rx_buffer_pgcnt = 0;
+#endif
+
+ prefetchw(rx_buffer->page);
+ *skb = rx_buffer->skb;
+
+ /* Delay unmapping of the first packet. It carries the header
+ * information, HW may still access the header after the writeback.
+ * Only unmap it when EOP is reached
+ */
+ if (!wx_test_staterr(rx_desc, WX_RXD_STAT_EOP)) {
+ if (!*skb)
+ goto skip_sync;
+ } else {
+ if (*skb)
+ wx_dma_sync_frag(rx_ring, rx_buffer);
+ }
+
+ /* we are reusing so sync this buffer for CPU use */
+ dma_sync_single_range_for_cpu(rx_ring->dev,
+ rx_buffer->dma,
+ rx_buffer->page_offset,
+ size,
+ DMA_FROM_DEVICE);
+skip_sync:
+ rx_buffer->pagecnt_bias--;
+
+ return rx_buffer;
+}
+
+static void wx_put_rx_buffer(struct wx_ring *rx_ring,
+ struct wx_rx_buffer *rx_buffer,
+ struct sk_buff *skb,
+ int rx_buffer_pgcnt)
+{
+ if (wx_can_reuse_rx_page(rx_buffer, rx_buffer_pgcnt)) {
+ /* hand second half of page back to the ring */
+ wx_reuse_rx_page(rx_ring, rx_buffer);
+ } else {
+ if (!IS_ERR(skb) && WX_CB(skb)->dma == rx_buffer->dma)
+ /* the page has been released from the ring */
+ WX_CB(skb)->page_released = true;
+ else
+ page_pool_put_full_page(rx_ring->page_pool, rx_buffer->page, false);
+
+ __page_frag_cache_drain(rx_buffer->page,
+ rx_buffer->pagecnt_bias);
+ }
+
+ /* clear contents of rx_buffer */
+ rx_buffer->page = NULL;
+ rx_buffer->skb = NULL;
+}
+
+static struct sk_buff *wx_build_skb(struct wx_ring *rx_ring,
+ struct wx_rx_buffer *rx_buffer,
+ union wx_rx_desc *rx_desc)
+{
+ unsigned int size = le16_to_cpu(rx_desc->wb.upper.length);
+#if (PAGE_SIZE < 8192)
+ unsigned int truesize = WX_RX_BUFSZ;
+#else
+ unsigned int truesize = ALIGN(size, L1_CACHE_BYTES);
+#endif
+ struct sk_buff *skb = rx_buffer->skb;
+
+ if (!skb) {
+ void *page_addr = page_address(rx_buffer->page) +
+ rx_buffer->page_offset;
+
+ /* prefetch first cache line of first page */
+ prefetch(page_addr);
+#if L1_CACHE_BYTES < 128
+ prefetch(page_addr + L1_CACHE_BYTES);
+#endif
+
+ /* allocate a skb to store the frags */
+ skb = napi_alloc_skb(&rx_ring->q_vector->napi, WX_RXBUFFER_256);
+ if (unlikely(!skb))
+ return NULL;
+
+ /* we will be copying header into skb->data in
+ * pskb_may_pull so it is in our interest to prefetch
+ * it now to avoid a possible cache miss
+ */
+ prefetchw(skb->data);
+
+ if (size <= WX_RXBUFFER_256) {
+ memcpy(__skb_put(skb, size), page_addr,
+ ALIGN(size, sizeof(long)));
+ rx_buffer->pagecnt_bias++;
+
+ return skb;
+ }
+
+ if (!wx_test_staterr(rx_desc, WX_RXD_STAT_EOP))
+ WX_CB(skb)->dma = rx_buffer->dma;
+
+ skb_add_rx_frag(skb, 0, rx_buffer->page,
+ rx_buffer->page_offset,
+ size, truesize);
+ goto out;
+
+ } else {
+ skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, rx_buffer->page,
+ rx_buffer->page_offset, size, truesize);
+ }
+
+out:
+#if (PAGE_SIZE < 8192)
+ /* flip page offset to other buffer */
+ rx_buffer->page_offset ^= truesize;
+#else
+ /* move offset up to the next cache line */
+ rx_buffer->page_offset += truesize;
+#endif
+
+ return skb;
+}
+
+static bool wx_alloc_mapped_page(struct wx_ring *rx_ring,
+ struct wx_rx_buffer *bi)
+{
+ struct page *page = bi->page;
+ dma_addr_t dma;
+
+ /* since we are recycling buffers we should seldom need to alloc */
+ if (likely(page))
+ return true;
+
+ page = page_pool_dev_alloc_pages(rx_ring->page_pool);
+ WARN_ON(!page);
+ dma = page_pool_get_dma_addr(page);
+
+ bi->page_dma = dma;
+ bi->page = page;
+ bi->page_offset = 0;
+ page_ref_add(page, USHRT_MAX - 1);
+ bi->pagecnt_bias = USHRT_MAX;
+
+ return true;
+}
+
+/**
+ * wx_alloc_rx_buffers - Replace used receive buffers
+ * @rx_ring: ring to place buffers on
+ * @cleaned_count: number of buffers to replace
+ **/
+void wx_alloc_rx_buffers(struct wx_ring *rx_ring, u16 cleaned_count)
+{
+ u16 i = rx_ring->next_to_use;
+ union wx_rx_desc *rx_desc;
+ struct wx_rx_buffer *bi;
+
+ /* nothing to do */
+ if (!cleaned_count)
+ return;
+
+ rx_desc = WX_RX_DESC(rx_ring, i);
+ bi = &rx_ring->rx_buffer_info[i];
+ i -= rx_ring->count;
+
+ do {
+ if (!wx_alloc_mapped_page(rx_ring, bi))
+ break;
+
+ /* sync the buffer for use by the device */
+ dma_sync_single_range_for_device(rx_ring->dev, bi->dma,
+ bi->page_offset,
+ WX_RX_BUFSZ,
+ DMA_FROM_DEVICE);
+
+ rx_desc->read.pkt_addr =
+ cpu_to_le64(bi->page_dma + bi->page_offset);
+
+ rx_desc++;
+ bi++;
+ i++;
+ if (unlikely(!i)) {
+ rx_desc = WX_RX_DESC(rx_ring, 0);
+ bi = rx_ring->rx_buffer_info;
+ i -= rx_ring->count;
+ }
+
+ /* clear the status bits for the next_to_use descriptor */
+ rx_desc->wb.upper.status_error = 0;
+
+ cleaned_count--;
+ } while (cleaned_count);
+
+ i += rx_ring->count;
+
+ if (rx_ring->next_to_use != i) {
+ rx_ring->next_to_use = i;
+ /* update next to alloc since we have filled the ring */
+ rx_ring->next_to_alloc = i;
+
+ /* Force memory writes to complete before letting h/w
+ * know there are new descriptors to fetch. (Only
+ * applicable for weak-ordered memory model archs,
+ * such as IA-64).
+ */
+ wmb();
+ writel(i, rx_ring->tail);
+ }
+}
+
+u16 wx_desc_unused(struct wx_ring *ring)
+{
+ u16 ntc = ring->next_to_clean;
+ u16 ntu = ring->next_to_use;
+
+ return ((ntc > ntu) ? 0 : ring->count) + ntc - ntu - 1;
+}
+
+/**
+ * wx_is_non_eop - process handling of non-EOP buffers
+ * @rx_ring: Rx ring being processed
+ * @rx_desc: Rx descriptor for current buffer
+ * @skb: Current socket buffer containing buffer in progress
+ *
+ * This function updates next to clean. If the buffer is an EOP buffer
+ * this function exits returning false, otherwise it will place the
+ * sk_buff in the next buffer to be chained and return true indicating
+ * that this is in fact a non-EOP buffer.
+ **/
+static bool wx_is_non_eop(struct wx_ring *rx_ring,
+ union wx_rx_desc *rx_desc,
+ struct sk_buff *skb)
+{
+ u32 ntc = rx_ring->next_to_clean + 1;
+
+ /* fetch, update, and store next to clean */
+ ntc = (ntc < rx_ring->count) ? ntc : 0;
+ rx_ring->next_to_clean = ntc;
+
+ prefetch(WX_RX_DESC(rx_ring, ntc));
+
+ /* if we are the last buffer then there is nothing else to do */
+ if (likely(wx_test_staterr(rx_desc, WX_RXD_STAT_EOP)))
+ return false;
+
+ rx_ring->rx_buffer_info[ntc].skb = skb;
+
+ return true;
+}
+
+static void wx_pull_tail(struct sk_buff *skb)
+{
+ skb_frag_t *frag = &skb_shinfo(skb)->frags[0];
+ unsigned int pull_len;
+ unsigned char *va;
+
+ /* it is valid to use page_address instead of kmap since we are
+ * working with pages allocated out of the lomem pool per
+ * alloc_page(GFP_ATOMIC)
+ */
+ va = skb_frag_address(frag);
+
+ /* we need the header to contain the greater of either ETH_HLEN or
+ * 60 bytes if the skb->len is less than 60 for skb_pad.
+ */
+ pull_len = eth_get_headlen(skb->dev, va, WX_RXBUFFER_256);
+
+ /* align pull length to size of long to optimize memcpy performance */
+ skb_copy_to_linear_data(skb, va, ALIGN(pull_len, sizeof(long)));
+
+ /* update all of the pointers */
+ skb_frag_size_sub(frag, pull_len);
+ skb_frag_off_add(frag, pull_len);
+ skb->data_len -= pull_len;
+ skb->tail += pull_len;
+}
+
+/**
+ * wx_cleanup_headers - Correct corrupted or empty headers
+ * @rx_ring: rx descriptor ring packet is being transacted on
+ * @rx_desc: pointer to the EOP Rx descriptor
+ * @skb: pointer to current skb being fixed
+ *
+ * Check for corrupted packet headers caused by senders on the local L2
+ * embedded NIC switch not setting up their Tx Descriptors right. These
+ * should be very rare.
+ *
+ * Also address the case where we are pulling data in on pages only
+ * and as such no data is present in the skb header.
+ *
+ * In addition if skb is not at least 60 bytes we need to pad it so that
+ * it is large enough to qualify as a valid Ethernet frame.
+ *
+ * Returns true if an error was encountered and skb was freed.
+ **/
+static bool wx_cleanup_headers(struct wx_ring *rx_ring,
+ union wx_rx_desc *rx_desc,
+ struct sk_buff *skb)
+{
+ struct net_device *netdev = rx_ring->netdev;
+
+ /* verify that the packet does not have any known errors */
+ if (!netdev ||
+ unlikely(wx_test_staterr(rx_desc, WX_RXD_ERR_RXE) &&
+ !(netdev->features & NETIF_F_RXALL))) {
+ dev_kfree_skb_any(skb);
+ return true;
+ }
+
+ /* place header in linear portion of buffer */
+ if (!skb_headlen(skb))
+ wx_pull_tail(skb);
+
+ /* if eth_skb_pad returns an error the skb was freed */
+ if (eth_skb_pad(skb))
+ return true;
+
+ return false;
+}
+
+/**
+ * wx_clean_rx_irq - Clean completed descriptors from Rx ring - bounce buf
+ * @q_vector: structure containing interrupt and ring information
+ * @rx_ring: rx descriptor ring to transact packets on
+ * @budget: Total limit on number of packets to process
+ *
+ * This function provides a "bounce buffer" approach to Rx interrupt
+ * processing. The advantage to this is that on systems that have
+ * expensive overhead for IOMMU access this provides a means of avoiding
+ * it by maintaining the mapping of the page to the system.
+ *
+ * Returns amount of work completed.
+ **/
+static int wx_clean_rx_irq(struct wx_q_vector *q_vector,
+ struct wx_ring *rx_ring,
+ int budget)
+{
+ unsigned int total_rx_bytes = 0, total_rx_packets = 0;
+ u16 cleaned_count = wx_desc_unused(rx_ring);
+
+ do {
+ struct wx_rx_buffer *rx_buffer;
+ union wx_rx_desc *rx_desc;
+ struct sk_buff *skb;
+ int rx_buffer_pgcnt;
+
+ /* return some buffers to hardware, one at a time is too slow */
+ if (cleaned_count >= WX_RX_BUFFER_WRITE) {
+ wx_alloc_rx_buffers(rx_ring, cleaned_count);
+ cleaned_count = 0;
+ }
+
+ rx_desc = WX_RX_DESC(rx_ring, rx_ring->next_to_clean);
+ if (!wx_test_staterr(rx_desc, WX_RXD_STAT_DD))
+ break;
+
+ /* This memory barrier is needed to keep us from reading
+ * any other fields out of the rx_desc until we know the
+ * descriptor has been written back
+ */
+ dma_rmb();
+
+ rx_buffer = wx_get_rx_buffer(rx_ring, rx_desc, &skb, &rx_buffer_pgcnt);
+
+ /* retrieve a buffer from the ring */
+ skb = wx_build_skb(rx_ring, rx_buffer, rx_desc);
+
+ /* exit if we failed to retrieve a buffer */
+ if (!skb) {
+ rx_buffer->pagecnt_bias++;
+ break;
+ }
+
+ wx_put_rx_buffer(rx_ring, rx_buffer, skb, rx_buffer_pgcnt);
+ cleaned_count++;
+
+ /* place incomplete frames back on ring for completion */
+ if (wx_is_non_eop(rx_ring, rx_desc, skb))
+ continue;
+
+ /* verify the packet layout is correct */
+ if (wx_cleanup_headers(rx_ring, rx_desc, skb))
+ continue;
+
+ /* probably a little skewed due to removing CRC */
+ total_rx_bytes += skb->len;
+
+ skb_record_rx_queue(skb, rx_ring->queue_index);
+ skb->protocol = eth_type_trans(skb, rx_ring->netdev);
+ napi_gro_receive(&q_vector->napi, skb);
+
+ /* update budget accounting */
+ total_rx_packets++;
+ } while (likely(total_rx_packets < budget));
+
+ u64_stats_update_begin(&rx_ring->syncp);
+ rx_ring->stats.packets += total_rx_packets;
+ rx_ring->stats.bytes += total_rx_bytes;
+ u64_stats_update_end(&rx_ring->syncp);
+ q_vector->rx.total_packets += total_rx_packets;
+ q_vector->rx.total_bytes += total_rx_bytes;
+
+ return total_rx_packets;
+}
/**
* wx_poll - NAPI polling RX/TX cleanup routine
**/
static int wx_poll(struct napi_struct *napi, int budget)
{
- return 0;
+ struct wx_q_vector *q_vector = container_of(napi, struct wx_q_vector, napi);
+ int per_ring_budget, work_done = 0;
+ struct wx *wx = q_vector->wx;
+ bool clean_complete = true;
+ struct wx_ring *ring;
+
+ /* Exit if we are called by netpoll */
+ if (budget <= 0)
+ return budget;
+
+ /* attempt to distribute budget to each queue fairly, but don't allow
+ * the budget to go below 1 because we'll exit polling
+ */
+ if (q_vector->rx.count > 1)
+ per_ring_budget = max(budget / q_vector->rx.count, 1);
+ else
+ per_ring_budget = budget;
+
+ wx_for_each_ring(ring, q_vector->rx) {
+ int cleaned = wx_clean_rx_irq(q_vector, ring, per_ring_budget);
+
+ work_done += cleaned;
+ if (cleaned >= per_ring_budget)
+ clean_complete = false;
+ }
+
+ /* If all work not completed, return budget and keep polling */
+ if (!clean_complete)
+ return budget;
+
+ /* all work done, exit the polling mode */
+ if (likely(napi_complete_done(napi, work_done))) {
+ if (netif_running(wx->netdev))
+ wx_intr_enable(wx, WX_INTR_Q(q_vector->v_idx));
+ };
+
+ return min(work_done, budget - 1);
+}
+
+void wx_napi_enable_all(struct wx *wx)
+{
+ struct wx_q_vector *q_vector;
+ int q_idx;
+
+ for (q_idx = 0; q_idx < wx->num_q_vectors; q_idx++) {
+ q_vector = wx->q_vector[q_idx];
+ napi_enable(&q_vector->napi);
+ }
+}
+EXPORT_SYMBOL(wx_napi_enable_all);
+
+void wx_napi_disable_all(struct wx *wx)
+{
+ struct wx_q_vector *q_vector;
+ int q_idx;
+
+ for (q_idx = 0; q_idx < wx->num_q_vectors; q_idx++) {
+ q_vector = wx->q_vector[q_idx];
+ napi_disable(&q_vector->napi);
+ }
}
+EXPORT_SYMBOL(wx_napi_disable_all);
/**
* wx_set_rss_queues: Allocate queues for RSS
}
EXPORT_SYMBOL(wx_configure_vectors);
+/**
+ * wx_clean_rx_ring - Free Rx Buffers per Queue
+ * @rx_ring: ring to free buffers from
+ **/
+static void wx_clean_rx_ring(struct wx_ring *rx_ring)
+{
+ struct wx_rx_buffer *rx_buffer;
+ u16 i = rx_ring->next_to_clean;
+
+ rx_buffer = &rx_ring->rx_buffer_info[i];
+
+ /* Free all the Rx ring sk_buffs */
+ while (i != rx_ring->next_to_alloc) {
+ if (rx_buffer->skb) {
+ struct sk_buff *skb = rx_buffer->skb;
+
+ if (WX_CB(skb)->page_released)
+ page_pool_put_full_page(rx_ring->page_pool, rx_buffer->page, false);
+
+ dev_kfree_skb(skb);
+ }
+
+ /* Invalidate cache lines that may have been written to by
+ * device so that we avoid corrupting memory.
+ */
+ dma_sync_single_range_for_cpu(rx_ring->dev,
+ rx_buffer->dma,
+ rx_buffer->page_offset,
+ WX_RX_BUFSZ,
+ DMA_FROM_DEVICE);
+
+ /* free resources associated with mapping */
+ page_pool_put_full_page(rx_ring->page_pool, rx_buffer->page, false);
+ __page_frag_cache_drain(rx_buffer->page,
+ rx_buffer->pagecnt_bias);
+
+ i++;
+ rx_buffer++;
+ if (i == rx_ring->count) {
+ i = 0;
+ rx_buffer = rx_ring->rx_buffer_info;
+ }
+ }
+
+ rx_ring->next_to_alloc = 0;
+ rx_ring->next_to_clean = 0;
+ rx_ring->next_to_use = 0;
+}
+
+/**
+ * wx_clean_all_rx_rings - Free Rx Buffers for all queues
+ * @wx: board private structure
+ **/
+void wx_clean_all_rx_rings(struct wx *wx)
+{
+ int i;
+
+ for (i = 0; i < wx->num_rx_queues; i++)
+ wx_clean_rx_ring(wx->rx_ring[i]);
+}
+EXPORT_SYMBOL(wx_clean_all_rx_rings);
+
/**
* wx_free_rx_resources - Free Rx Resources
* @rx_ring: ring to clean the resources from
**/
static void wx_free_rx_resources(struct wx_ring *rx_ring)
{
+ wx_clean_rx_ring(rx_ring);
kvfree(rx_ring->rx_buffer_info);
rx_ring->rx_buffer_info = NULL;
if (!rx_ring->desc)
goto err;
+ rx_ring->next_to_clean = 0;
+ rx_ring->next_to_use = 0;
+
ret = wx_alloc_page_pool(rx_ring);
if (ret < 0) {
dev_err(rx_ring->dev, "Page pool creation failed: %d\n", ret);
}
EXPORT_SYMBOL(wx_setup_resources);
+/**
+ * wx_get_stats64 - Get System Network Statistics
+ * @netdev: network interface device structure
+ * @stats: storage space for 64bit statistics
+ */
+void wx_get_stats64(struct net_device *netdev,
+ struct rtnl_link_stats64 *stats)
+{
+ struct wx *wx = netdev_priv(netdev);
+ int i;
+
+ rcu_read_lock();
+ for (i = 0; i < wx->num_rx_queues; i++) {
+ struct wx_ring *ring = READ_ONCE(wx->rx_ring[i]);
+ u64 bytes, packets;
+ unsigned int start;
+
+ if (ring) {
+ do {
+ start = u64_stats_fetch_begin(&ring->syncp);
+ packets = ring->stats.packets;
+ bytes = ring->stats.bytes;
+ } while (u64_stats_fetch_retry(&ring->syncp, start));
+ stats->rx_packets += packets;
+ stats->rx_bytes += bytes;
+ }
+ }
+
+ rcu_read_unlock();
+}
+EXPORT_SYMBOL(wx_get_stats64);
+
MODULE_LICENSE("GPL");
projects / linux-2.6-block.git / commitdiff