Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0
/* Copyright(c) 2013 - 2019 Intel Corporation. */
 
#include <linux/types.h>
#include <linux/module.h>
#include <net/ipv6.h>
#include <net/ip.h>
#include <net/tcp.h>
#include <linux/if_macvlan.h>
#include <linux/prefetch.h>
 
#include "fm10k.h"
 
#define DRV_SUMMARY	"Intel(R) Ethernet Switch Host Interface Driver"
char fm10k_driver_name[] = "fm10k";
static const char fm10k_driver_string[] = DRV_SUMMARY;
static const char fm10k_copyright[] =
<------>"Copyright(c) 2013 - 2019 Intel Corporation.";
 
MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
MODULE_DESCRIPTION(DRV_SUMMARY);
MODULE_LICENSE("GPL v2");
 
/* single workqueue for entire fm10k driver */
struct workqueue_struct *fm10k_workqueue;
 
/**
 * fm10k_init_module - Driver Registration Routine
 *
 * fm10k_init_module is the first routine called when the driver is
 * loaded.  All it does is register with the PCI subsystem.
 **/
static int __init fm10k_init_module(void)
{
<------>pr_info("%s\n", fm10k_driver_string);
<------>pr_info("%s\n", fm10k_copyright);
 
<------>/* create driver workqueue */
<------>fm10k_workqueue = alloc_workqueue("%s", WQ_MEM_RECLAIM, 0,
<------><------><------><------><------>  fm10k_driver_name);
<------>if (!fm10k_workqueue)
<------><------>return -ENOMEM;
 
<------>fm10k_dbg_init();
 
<------>return fm10k_register_pci_driver();
}
module_init(fm10k_init_module);
 
/**
 * fm10k_exit_module - Driver Exit Cleanup Routine
 *
 * fm10k_exit_module is called just before the driver is removed
 * from memory.
 **/
static void __exit fm10k_exit_module(void)
{
<------>fm10k_unregister_pci_driver();
 
<------>fm10k_dbg_exit();
 
<------>/* destroy driver workqueue */
<------>destroy_workqueue(fm10k_workqueue);
}
module_exit(fm10k_exit_module);
 
static bool fm10k_alloc_mapped_page(struct fm10k_ring *rx_ring,
<------><------><------><------>    struct fm10k_rx_buffer *bi)
{
<------>struct page *page = bi->page;
<------>dma_addr_t dma;
 
<------>/* Only page will be NULL if buffer was consumed */
<------>if (likely(page))
<------><------>return true;
 
<------>/* alloc new page for storage */
<------>page = dev_alloc_page();
<------>if (unlikely(!page)) {
<------><------>rx_ring->rx_stats.alloc_failed++;
<------><------>return false;
<------>}
 
<------>/* map page for use */
<------>dma = dma_map_page(rx_ring->dev, page, 0, PAGE_SIZE, DMA_FROM_DEVICE);
 
<------>/* if mapping failed free memory back to system since
<------> * there isn't much point in holding memory we can't use
<------> */
<------>if (dma_mapping_error(rx_ring->dev, dma)) {
<------><------>__free_page(page);
 
<------><------>rx_ring->rx_stats.alloc_failed++;
<------><------>return false;
<------>}
 
<------>bi->dma = dma;
<------>bi->page = page;
<------>bi->page_offset = 0;
 
<------>return true;
}
 
/**
 * fm10k_alloc_rx_buffers - Replace used receive buffers
 * @rx_ring: ring to place buffers on
 * @cleaned_count: number of buffers to replace
 **/
void fm10k_alloc_rx_buffers(struct fm10k_ring *rx_ring, u16 cleaned_count)
{
<------>union fm10k_rx_desc *rx_desc;
<------>struct fm10k_rx_buffer *bi;
<------>u16 i = rx_ring->next_to_use;
 
<------>/* nothing to do */
<------>if (!cleaned_count)
<------><------>return;
 
<------>rx_desc = FM10K_RX_DESC(rx_ring, i);
<------>bi = &rx_ring->rx_buffer[i];
<------>i -= rx_ring->count;
 
<------>do {
<------><------>if (!fm10k_alloc_mapped_page(rx_ring, bi))
<------><------><------>break;
 
<------><------>/* Refresh the desc even if buffer_addrs didn't change
<------><------> * because each write-back erases this info.
<------><------> */
<------><------>rx_desc->q.pkt_addr = cpu_to_le64(bi->dma + bi->page_offset);
 
<------><------>rx_desc++;
<------><------>bi++;
<------><------>i++;
<------><------>if (unlikely(!i)) {
<------><------><------>rx_desc = FM10K_RX_DESC(rx_ring, 0);
<------><------><------>bi = rx_ring->rx_buffer;
<------><------><------>i -= rx_ring->count;
<------><------>}
 
<------><------>/* clear the status bits for the next_to_use descriptor */
<------><------>rx_desc->d.staterr = 0;
 
<------><------>cleaned_count--;
<------>} while (cleaned_count);
 
<------>i += rx_ring->count;
 
<------>if (rx_ring->next_to_use != i) {
<------><------>/* record the next descriptor to use */
<------><------>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();
 
<------><------>/* notify hardware of new descriptors */
<------><------>writel(i, rx_ring->tail);
<------>}
}
 
/**
 * fm10k_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 interface
 **/
static void fm10k_reuse_rx_page(struct fm10k_ring *rx_ring,
<------><------><------><------>struct fm10k_rx_buffer *old_buff)
{
<------>struct fm10k_rx_buffer *new_buff;
<------>u16 nta = rx_ring->next_to_alloc;
 
<------>new_buff = &rx_ring->rx_buffer[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 = *old_buff;
 
<------>/* sync the buffer for use by the device */
<------>dma_sync_single_range_for_device(rx_ring->dev, old_buff->dma,
<------><------><------><------><------> old_buff->page_offset,
<------><------><------><------><------> FM10K_RX_BUFSZ,
<------><------><------><------><------> DMA_FROM_DEVICE);
}
 
static inline bool fm10k_page_is_reserved(struct page *page)
{
<------>return (page_to_nid(page) != numa_mem_id()) || page_is_pfmemalloc(page);
}
 
static bool fm10k_can_reuse_rx_page(struct fm10k_rx_buffer *rx_buffer,
<------><------><------><------>    struct page *page,
<------><------><------><------>    unsigned int __maybe_unused truesize)
{
<------>/* avoid re-using remote pages */
<------>if (unlikely(fm10k_page_is_reserved(page)))
<------><------>return false;
 
#if (PAGE_SIZE < 8192)
<------>/* if we are only owner of page we can reuse it */
<------>if (unlikely(page_count(page) != 1))
<------><------>return false;
 
<------>/* flip page offset to other buffer */
<------>rx_buffer->page_offset ^= FM10K_RX_BUFSZ;
#else
<------>/* move offset up to the next cache line */
<------>rx_buffer->page_offset += truesize;
 
<------>if (rx_buffer->page_offset > (PAGE_SIZE - FM10K_RX_BUFSZ))
<------><------>return false;
#endif
 
<------>/* Even if we own the page, we are not allowed to use atomic_set()
<------> * This would break get_page_unless_zero() users.
<------> */
<------>page_ref_inc(page);
 
<------>return true;
}
 
/**
 * fm10k_add_rx_frag - Add contents of Rx buffer to sk_buff
 * @rx_buffer: buffer containing page to add
 * @size: packet size from rx_desc
 * @rx_desc: descriptor containing length of buffer written by hardware
 * @skb: sk_buff to place the data into
 *
 * This function will add the data contained in rx_buffer->page to the skb.
 * This is done either through a direct copy if the data in the buffer is
 * less than the skb header size, otherwise it will just attach the page as
 * a frag to the skb.
 *
 * The function will then update the page offset if necessary and return
 * true if the buffer can be reused by the interface.
 **/
static bool fm10k_add_rx_frag(struct fm10k_rx_buffer *rx_buffer,
<------><------><------>      unsigned int size,
<------><------><------>      union fm10k_rx_desc *rx_desc,
<------><------><------>      struct sk_buff *skb)
{
<------>struct page *page = rx_buffer->page;
<------>unsigned char *va = page_address(page) + rx_buffer->page_offset;
#if (PAGE_SIZE < 8192)
<------>unsigned int truesize = FM10K_RX_BUFSZ;
#else
<------>unsigned int truesize = ALIGN(size, 512);
#endif
<------>unsigned int pull_len;
 
<------>if (unlikely(skb_is_nonlinear(skb)))
<------><------>goto add_tail_frag;
 
<------>if (likely(size <= FM10K_RX_HDR_LEN)) {
<------><------>memcpy(__skb_put(skb, size), va, ALIGN(size, sizeof(long)));
 
<------><------>/* page is not reserved, we can reuse buffer as-is */
<------><------>if (likely(!fm10k_page_is_reserved(page)))
<------><------><------>return true;
 
<------><------>/* this page cannot be reused so discard it */
<------><------>__free_page(page);
<------><------>return false;
<------>}
 
<------>/* 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, FM10K_RX_HDR_LEN);
 
<------>/* align pull length to size of long to optimize memcpy performance */
<------>memcpy(__skb_put(skb, pull_len), va, ALIGN(pull_len, sizeof(long)));
 
<------>/* update all of the pointers */
<------>va += pull_len;
<------>size -= pull_len;
 
add_tail_frag:
<------>skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page,
<------><------><------>(unsigned long)va & ~PAGE_MASK, size, truesize);
 
<------>return fm10k_can_reuse_rx_page(rx_buffer, page, truesize);
}
 
static struct sk_buff *fm10k_fetch_rx_buffer(struct fm10k_ring *rx_ring,
<------><------><------><------><------>     union fm10k_rx_desc *rx_desc,
<------><------><------><------><------>     struct sk_buff *skb)
{
<------>unsigned int size = le16_to_cpu(rx_desc->w.length);
<------>struct fm10k_rx_buffer *rx_buffer;
<------>struct page *page;
 
<------>rx_buffer = &rx_ring->rx_buffer[rx_ring->next_to_clean];
<------>page = rx_buffer->page;
<------>prefetchw(page);
 
<------>if (likely(!skb)) {
<------><------>void *page_addr = page_address(page) +
<------><------><------><------>  rx_buffer->page_offset;
 
<------><------>/* prefetch first cache line of first page */
<------><------>net_prefetch(page_addr);
 
<------><------>/* allocate a skb to store the frags */
<------><------>skb = napi_alloc_skb(&rx_ring->q_vector->napi,
<------><------><------><------>     FM10K_RX_HDR_LEN);
<------><------>if (unlikely(!skb)) {
<------><------><------>rx_ring->rx_stats.alloc_failed++;
<------><------><------>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);
<------>}
 
<------>/* 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);
 
<------>/* pull page into skb */
<------>if (fm10k_add_rx_frag(rx_buffer, size, rx_desc, skb)) {
<------><------>/* hand second half of page back to the ring */
<------><------>fm10k_reuse_rx_page(rx_ring, rx_buffer);
<------>} else {
<------><------>/* we are not reusing the buffer so unmap it */
<------><------>dma_unmap_page(rx_ring->dev, rx_buffer->dma,
<------><------><------>       PAGE_SIZE, DMA_FROM_DEVICE);
<------>}
 
<------>/* clear contents of rx_buffer */
<------>rx_buffer->page = NULL;
 
<------>return skb;
}
 
static inline void fm10k_rx_checksum(struct fm10k_ring *ring,
<------><------><------><------>     union fm10k_rx_desc *rx_desc,
<------><------><------><------>     struct sk_buff *skb)
{
<------>skb_checksum_none_assert(skb);
 
<------>/* Rx checksum disabled via ethtool */
<------>if (!(ring->netdev->features & NETIF_F_RXCSUM))
<------><------>return;
 
<------>/* TCP/UDP checksum error bit is set */
<------>if (fm10k_test_staterr(rx_desc,
<------><------><------>       FM10K_RXD_STATUS_L4E |
<------><------><------>       FM10K_RXD_STATUS_L4E2 |
<------><------><------>       FM10K_RXD_STATUS_IPE |
<------><------><------>       FM10K_RXD_STATUS_IPE2)) {
<------><------>ring->rx_stats.csum_err++;
<------><------>return;
<------>}
 
<------>/* It must be a TCP or UDP packet with a valid checksum */
<------>if (fm10k_test_staterr(rx_desc, FM10K_RXD_STATUS_L4CS2))
<------><------>skb->encapsulation = true;
<------>else if (!fm10k_test_staterr(rx_desc, FM10K_RXD_STATUS_L4CS))
<------><------>return;
 
<------>skb->ip_summed = CHECKSUM_UNNECESSARY;
 
<------>ring->rx_stats.csum_good++;
}
 
#define FM10K_RSS_L4_TYPES_MASK \
<------>(BIT(FM10K_RSSTYPE_IPV4_TCP) | \
<------> BIT(FM10K_RSSTYPE_IPV4_UDP) | \
<------> BIT(FM10K_RSSTYPE_IPV6_TCP) | \
<------> BIT(FM10K_RSSTYPE_IPV6_UDP))
 
static inline void fm10k_rx_hash(struct fm10k_ring *ring,
<------><------><------><------> union fm10k_rx_desc *rx_desc,
<------><------><------><------> struct sk_buff *skb)
{
<------>u16 rss_type;
 
<------>if (!(ring->netdev->features & NETIF_F_RXHASH))
<------><------>return;
 
<------>rss_type = le16_to_cpu(rx_desc->w.pkt_info) & FM10K_RXD_RSSTYPE_MASK;
<------>if (!rss_type)
<------><------>return;
 
<------>skb_set_hash(skb, le32_to_cpu(rx_desc->d.rss),
<------><------>     (BIT(rss_type) & FM10K_RSS_L4_TYPES_MASK) ?
<------><------>     PKT_HASH_TYPE_L4 : PKT_HASH_TYPE_L3);
}
 
static void fm10k_type_trans(struct fm10k_ring *rx_ring,
<------><------><------>     union fm10k_rx_desc __maybe_unused *rx_desc,
<------><------><------>     struct sk_buff *skb)
{
<------>struct net_device *dev = rx_ring->netdev;
<------>struct fm10k_l2_accel *l2_accel = rcu_dereference_bh(rx_ring->l2_accel);
 
<------>/* check to see if DGLORT belongs to a MACVLAN */
<------>if (l2_accel) {
<------><------>u16 idx = le16_to_cpu(FM10K_CB(skb)->fi.w.dglort) - 1;
 
<------><------>idx -= l2_accel->dglort;
<------><------>if (idx < l2_accel->size && l2_accel->macvlan[idx])
<------><------><------>dev = l2_accel->macvlan[idx];
<------><------>else
<------><------><------>l2_accel = NULL;
<------>}
 
<------>/* Record Rx queue, or update macvlan statistics */
<------>if (!l2_accel)
<------><------>skb_record_rx_queue(skb, rx_ring->queue_index);
<------>else
<------><------>macvlan_count_rx(netdev_priv(dev), skb->len + ETH_HLEN, true,
<------><------><------><------> false);
 
<------>skb->protocol = eth_type_trans(skb, dev);
}
 
/**
 * fm10k_process_skb_fields - Populate skb header fields from Rx descriptor
 * @rx_ring: rx descriptor ring packet is being transacted on
 * @rx_desc: pointer to the EOP Rx descriptor
 * @skb: pointer to current skb being populated
 *
 * This function checks the ring, descriptor, and packet information in
 * order to populate the hash, checksum, VLAN, timestamp, protocol, and
 * other fields within the skb.
 **/
static unsigned int fm10k_process_skb_fields(struct fm10k_ring *rx_ring,
<------><------><------><------><------>     union fm10k_rx_desc *rx_desc,
<------><------><------><------><------>     struct sk_buff *skb)
{
<------>unsigned int len = skb->len;
 
<------>fm10k_rx_hash(rx_ring, rx_desc, skb);
 
<------>fm10k_rx_checksum(rx_ring, rx_desc, skb);
 
<------>FM10K_CB(skb)->tstamp = rx_desc->q.timestamp;
 
<------>FM10K_CB(skb)->fi.w.vlan = rx_desc->w.vlan;
 
<------>FM10K_CB(skb)->fi.d.glort = rx_desc->d.glort;
 
<------>if (rx_desc->w.vlan) {
<------><------>u16 vid = le16_to_cpu(rx_desc->w.vlan);
 
<------><------>if ((vid & VLAN_VID_MASK) != rx_ring->vid)
<------><------><------>__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vid);
<------><------>else if (vid & VLAN_PRIO_MASK)
<------><------><------>__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
<------><------><------><------><------>       vid & VLAN_PRIO_MASK);
<------>}
 
<------>fm10k_type_trans(rx_ring, rx_desc, skb);
 
<------>return len;
}
 
/**
 * fm10k_is_non_eop - process handling of non-EOP buffers
 * @rx_ring: Rx ring being processed
 * @rx_desc: Rx descriptor for current buffer
 *
 * 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 fm10k_is_non_eop(struct fm10k_ring *rx_ring,
<------><------><------>     union fm10k_rx_desc *rx_desc)
{
<------>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(FM10K_RX_DESC(rx_ring, ntc));
 
<------>if (likely(fm10k_test_staterr(rx_desc, FM10K_RXD_STATUS_EOP)))
<------><------>return false;
 
<------>return true;
}
 
/**
 * fm10k_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
 *
 * 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 fm10k_cleanup_headers(struct fm10k_ring *rx_ring,
<------><------><------><------>  union fm10k_rx_desc *rx_desc,
<------><------><------><------>  struct sk_buff *skb)
{
<------>if (unlikely((fm10k_test_staterr(rx_desc,
<------><------><------><------><------> FM10K_RXD_STATUS_RXE)))) {
#define FM10K_TEST_RXD_BIT(rxd, bit) \
<------>((rxd)->w.csum_err & cpu_to_le16(bit))
<------><------>if (FM10K_TEST_RXD_BIT(rx_desc, FM10K_RXD_ERR_SWITCH_ERROR))
<------><------><------>rx_ring->rx_stats.switch_errors++;
<------><------>if (FM10K_TEST_RXD_BIT(rx_desc, FM10K_RXD_ERR_NO_DESCRIPTOR))
<------><------><------>rx_ring->rx_stats.drops++;
<------><------>if (FM10K_TEST_RXD_BIT(rx_desc, FM10K_RXD_ERR_PP_ERROR))
<------><------><------>rx_ring->rx_stats.pp_errors++;
<------><------>if (FM10K_TEST_RXD_BIT(rx_desc, FM10K_RXD_ERR_SWITCH_READY))
<------><------><------>rx_ring->rx_stats.link_errors++;
<------><------>if (FM10K_TEST_RXD_BIT(rx_desc, FM10K_RXD_ERR_TOO_BIG))
<------><------><------>rx_ring->rx_stats.length_errors++;
<------><------>dev_kfree_skb_any(skb);
<------><------>rx_ring->rx_stats.errors++;
<------><------>return true;
<------>}
 
<------>/* if eth_skb_pad returns an error the skb was freed */
<------>if (eth_skb_pad(skb))
<------><------>return true;
 
<------>return false;
}
 
/**
 * fm10k_receive_skb - helper function to handle rx indications
 * @q_vector: structure containing interrupt and ring information
 * @skb: packet to send up
 **/
static void fm10k_receive_skb(struct fm10k_q_vector *q_vector,
<------><------><------>      struct sk_buff *skb)
{
<------>napi_gro_receive(&q_vector->napi, skb);
}
 
static int fm10k_clean_rx_irq(struct fm10k_q_vector *q_vector,
<------><------><------>      struct fm10k_ring *rx_ring,
<------><------><------>      int budget)
{
<------>struct sk_buff *skb = rx_ring->skb;
<------>unsigned int total_bytes = 0, total_packets = 0;
<------>u16 cleaned_count = fm10k_desc_unused(rx_ring);
 
<------>while (likely(total_packets < budget)) {
<------><------>union fm10k_rx_desc *rx_desc;
 
<------><------>/* return some buffers to hardware, one at a time is too slow */
<------><------>if (cleaned_count >= FM10K_RX_BUFFER_WRITE) {
<------><------><------>fm10k_alloc_rx_buffers(rx_ring, cleaned_count);
<------><------><------>cleaned_count = 0;
<------><------>}
 
<------><------>rx_desc = FM10K_RX_DESC(rx_ring, rx_ring->next_to_clean);
 
<------><------>if (!rx_desc->d.staterr)
<------><------><------>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();
 
<------><------>/* retrieve a buffer from the ring */
<------><------>skb = fm10k_fetch_rx_buffer(rx_ring, rx_desc, skb);
 
<------><------>/* exit if we failed to retrieve a buffer */
<------><------>if (!skb)
<------><------><------>break;
 
<------><------>cleaned_count++;
 
<------><------>/* fetch next buffer in frame if non-eop */
<------><------>if (fm10k_is_non_eop(rx_ring, rx_desc))
<------><------><------>continue;
 
<------><------>/* verify the packet layout is correct */
<------><------>if (fm10k_cleanup_headers(rx_ring, rx_desc, skb)) {
<------><------><------>skb = NULL;
<------><------><------>continue;
<------><------>}
 
<------><------>/* populate checksum, timestamp, VLAN, and protocol */
<------><------>total_bytes += fm10k_process_skb_fields(rx_ring, rx_desc, skb);
 
<------><------>fm10k_receive_skb(q_vector, skb);
 
<------><------>/* reset skb pointer */
<------><------>skb = NULL;
 
<------><------>/* update budget accounting */
<------><------>total_packets++;
<------>}
 
<------>/* place incomplete frames back on ring for completion */
<------>rx_ring->skb = skb;
 
<------>u64_stats_update_begin(&rx_ring->syncp);
<------>rx_ring->stats.packets += total_packets;
<------>rx_ring->stats.bytes += total_bytes;
<------>u64_stats_update_end(&rx_ring->syncp);
<------>q_vector->rx.total_packets += total_packets;
<------>q_vector->rx.total_bytes += total_bytes;
 
<------>return total_packets;
}
 
#define VXLAN_HLEN (sizeof(struct udphdr) + 8)
static struct ethhdr *fm10k_port_is_vxlan(struct sk_buff *skb)
{
<------>struct fm10k_intfc *interface = netdev_priv(skb->dev);
 
<------>if (interface->vxlan_port != udp_hdr(skb)->dest)
<------><------>return NULL;
 
<------>/* return offset of udp_hdr plus 8 bytes for VXLAN header */
<------>return (struct ethhdr *)(skb_transport_header(skb) + VXLAN_HLEN);
}
 
#define FM10K_NVGRE_RESERVED0_FLAGS htons(0x9FFF)
#define NVGRE_TNI htons(0x2000)
struct fm10k_nvgre_hdr {
<------>__be16 flags;
<------>__be16 proto;
<------>__be32 tni;
};
 
static struct ethhdr *fm10k_gre_is_nvgre(struct sk_buff *skb)
{
<------>struct fm10k_nvgre_hdr *nvgre_hdr;
<------>int hlen = ip_hdrlen(skb);
 
<------>/* currently only IPv4 is supported due to hlen above */
<------>if (vlan_get_protocol(skb) != htons(ETH_P_IP))
<------><------>return NULL;
 
<------>/* our transport header should be NVGRE */
<------>nvgre_hdr = (struct fm10k_nvgre_hdr *)(skb_network_header(skb) + hlen);
 
<------>/* verify all reserved flags are 0 */
<------>if (nvgre_hdr->flags & FM10K_NVGRE_RESERVED0_FLAGS)
<------><------>return NULL;
 
<------>/* report start of ethernet header */
<------>if (nvgre_hdr->flags & NVGRE_TNI)
<------><------>return (struct ethhdr *)(nvgre_hdr + 1);
 
<------>return (struct ethhdr *)(&nvgre_hdr->tni);
}
 
__be16 fm10k_tx_encap_offload(struct sk_buff *skb)
{
<------>u8 l4_hdr = 0, inner_l4_hdr = 0, inner_l4_hlen;
<------>struct ethhdr *eth_hdr;
 
<------>if (skb->inner_protocol_type != ENCAP_TYPE_ETHER ||
<------>    skb->inner_protocol != htons(ETH_P_TEB))
<------><------>return 0;
 
<------>switch (vlan_get_protocol(skb)) {
<------>case htons(ETH_P_IP):
<------><------>l4_hdr = ip_hdr(skb)->protocol;
<------><------>break;
<------>case htons(ETH_P_IPV6):
<------><------>l4_hdr = ipv6_hdr(skb)->nexthdr;
<------><------>break;
<------>default:
<------><------>return 0;
<------>}
 
<------>switch (l4_hdr) {
<------>case IPPROTO_UDP:
<------><------>eth_hdr = fm10k_port_is_vxlan(skb);
<------><------>break;
<------>case IPPROTO_GRE:
<------><------>eth_hdr = fm10k_gre_is_nvgre(skb);
<------><------>break;
<------>default:
<------><------>return 0;
<------>}
 
<------>if (!eth_hdr)
<------><------>return 0;
 
<------>switch (eth_hdr->h_proto) {
<------>case htons(ETH_P_IP):
<------><------>inner_l4_hdr = inner_ip_hdr(skb)->protocol;
<------><------>break;
<------>case htons(ETH_P_IPV6):
<------><------>inner_l4_hdr = inner_ipv6_hdr(skb)->nexthdr;
<------><------>break;
<------>default:
<------><------>return 0;
<------>}
 
<------>switch (inner_l4_hdr) {
<------>case IPPROTO_TCP:
<------><------>inner_l4_hlen = inner_tcp_hdrlen(skb);
<------><------>break;
<------>case IPPROTO_UDP:
<------><------>inner_l4_hlen = 8;
<------><------>break;
<------>default:
<------><------>return 0;
<------>}
 
<------>/* The hardware allows tunnel offloads only if the combined inner and
<------> * outer header is 184 bytes or less
<------> */
<------>if (skb_inner_transport_header(skb) + inner_l4_hlen -
<------>    skb_mac_header(skb) > FM10K_TUNNEL_HEADER_LENGTH)
<------><------>return 0;
 
<------>return eth_hdr->h_proto;
}
 
static int fm10k_tso(struct fm10k_ring *tx_ring,
<------><------>     struct fm10k_tx_buffer *first)
{
<------>struct sk_buff *skb = first->skb;
<------>struct fm10k_tx_desc *tx_desc;
<------>unsigned char *th;
<------>u8 hdrlen;
 
<------>if (skb->ip_summed != CHECKSUM_PARTIAL)
<------><------>return 0;
 
<------>if (!skb_is_gso(skb))
<------><------>return 0;
 
<------>/* compute header lengths */
<------>if (skb->encapsulation) {
<------><------>if (!fm10k_tx_encap_offload(skb))
<------><------><------>goto err_vxlan;
<------><------>th = skb_inner_transport_header(skb);
<------>} else {
<------><------>th = skb_transport_header(skb);
<------>}
 
<------>/* compute offset from SOF to transport header and add header len */
<------>hdrlen = (th - skb->data) + (((struct tcphdr *)th)->doff << 2);
 
<------>first->tx_flags |= FM10K_TX_FLAGS_CSUM;
 
<------>/* update gso size and bytecount with header size */
<------>first->gso_segs = skb_shinfo(skb)->gso_segs;
<------>first->bytecount += (first->gso_segs - 1) * hdrlen;
 
<------>/* populate Tx descriptor header size and mss */
<------>tx_desc = FM10K_TX_DESC(tx_ring, tx_ring->next_to_use);
<------>tx_desc->hdrlen = hdrlen;
<------>tx_desc->mss = cpu_to_le16(skb_shinfo(skb)->gso_size);
 
<------>return 1;
 
err_vxlan:
<------>tx_ring->netdev->features &= ~NETIF_F_GSO_UDP_TUNNEL;
<------>if (net_ratelimit())
<------><------>netdev_err(tx_ring->netdev,
<------><------><------>   "TSO requested for unsupported tunnel, disabling offload\n");
<------>return -1;
}
 
static void fm10k_tx_csum(struct fm10k_ring *tx_ring,
<------><------><------>  struct fm10k_tx_buffer *first)
{
<------>struct sk_buff *skb = first->skb;
<------>struct fm10k_tx_desc *tx_desc;
<------>union {
<------><------>struct iphdr *ipv4;
<------><------>struct ipv6hdr *ipv6;
<------><------>u8 *raw;
<------>} network_hdr;
<------>u8 *transport_hdr;
<------>__be16 frag_off;
<------>__be16 protocol;
<------>u8 l4_hdr = 0;
 
<------>if (skb->ip_summed != CHECKSUM_PARTIAL)
<------><------>goto no_csum;
 
<------>if (skb->encapsulation) {
<------><------>protocol = fm10k_tx_encap_offload(skb);
<------><------>if (!protocol) {
<------><------><------>if (skb_checksum_help(skb)) {
<------><------><------><------>dev_warn(tx_ring->dev,
<------><------><------><------><------> "failed to offload encap csum!\n");
<------><------><------><------>tx_ring->tx_stats.csum_err++;
<------><------><------>}
<------><------><------>goto no_csum;
<------><------>}
<------><------>network_hdr.raw = skb_inner_network_header(skb);
<------><------>transport_hdr = skb_inner_transport_header(skb);
<------>} else {
<------><------>protocol = vlan_get_protocol(skb);
<------><------>network_hdr.raw = skb_network_header(skb);
<------><------>transport_hdr = skb_transport_header(skb);
<------>}
 
<------>switch (protocol) {
<------>case htons(ETH_P_IP):
<------><------>l4_hdr = network_hdr.ipv4->protocol;
<------><------>break;
<------>case htons(ETH_P_IPV6):
<------><------>l4_hdr = network_hdr.ipv6->nexthdr;
<------><------>if (likely((transport_hdr - network_hdr.raw) ==
<------><------><------>   sizeof(struct ipv6hdr)))
<------><------><------>break;
<------><------>ipv6_skip_exthdr(skb, network_hdr.raw - skb->data +
<------><------><------><------>      sizeof(struct ipv6hdr),
<------><------><------><------> &l4_hdr, &frag_off);
<------><------>if (unlikely(frag_off))
<------><------><------>l4_hdr = NEXTHDR_FRAGMENT;
<------><------>break;
<------>default:
<------><------>break;
<------>}
 
<------>switch (l4_hdr) {
<------>case IPPROTO_TCP:
<------>case IPPROTO_UDP:
<------><------>break;
<------>case IPPROTO_GRE:
<------><------>if (skb->encapsulation)
<------><------><------>break;
<------><------>fallthrough;
<------>default:
<------><------>if (unlikely(net_ratelimit())) {
<------><------><------>dev_warn(tx_ring->dev,
<------><------><------><------> "partial checksum, version=%d l4 proto=%x\n",
<------><------><------><------> protocol, l4_hdr);
<------><------>}
<------><------>skb_checksum_help(skb);
<------><------>tx_ring->tx_stats.csum_err++;
<------><------>goto no_csum;
<------>}
 
<------>/* update TX checksum flag */
<------>first->tx_flags |= FM10K_TX_FLAGS_CSUM;
<------>tx_ring->tx_stats.csum_good++;
 
no_csum:
<------>/* populate Tx descriptor header size and mss */
<------>tx_desc = FM10K_TX_DESC(tx_ring, tx_ring->next_to_use);
<------>tx_desc->hdrlen = 0;
<------>tx_desc->mss = 0;
}
 
#define FM10K_SET_FLAG(_input, _flag, _result) \
<------>((_flag <= _result) ? \
<------> ((u32)(_input & _flag) * (_result / _flag)) : \
<------> ((u32)(_input & _flag) / (_flag / _result)))
 
static u8 fm10k_tx_desc_flags(struct sk_buff *skb, u32 tx_flags)
{
<------>/* set type for advanced descriptor with frame checksum insertion */
<------>u32 desc_flags = 0;
 
<------>/* set checksum offload bits */
<------>desc_flags |= FM10K_SET_FLAG(tx_flags, FM10K_TX_FLAGS_CSUM,
<------><------><------><------>     FM10K_TXD_FLAG_CSUM);
 
<------>return desc_flags;
}
 
static bool fm10k_tx_desc_push(struct fm10k_ring *tx_ring,
<------><------><------>       struct fm10k_tx_desc *tx_desc, u16 i,
<------><------><------>       dma_addr_t dma, unsigned int size, u8 desc_flags)
{
<------>/* set RS and INT for last frame in a cache line */
<------>if ((++i & (FM10K_TXD_WB_FIFO_SIZE - 1)) == 0)
<------><------>desc_flags |= FM10K_TXD_FLAG_RS | FM10K_TXD_FLAG_INT;
 
<------>/* record values to descriptor */
<------>tx_desc->buffer_addr = cpu_to_le64(dma);
<------>tx_desc->flags = desc_flags;
<------>tx_desc->buflen = cpu_to_le16(size);
 
<------>/* return true if we just wrapped the ring */
<------>return i == tx_ring->count;
}
 
static int __fm10k_maybe_stop_tx(struct fm10k_ring *tx_ring, u16 size)
{
<------>netif_stop_subqueue(tx_ring->netdev, tx_ring->queue_index);
 
<------>/* Memory barrier before checking head and tail */
<------>smp_mb();
 
<------>/* Check again in a case another CPU has just made room available */
<------>if (likely(fm10k_desc_unused(tx_ring) < size))
<------><------>return -EBUSY;
 
<------>/* A reprieve! - use start_queue because it doesn't call schedule */
<------>netif_start_subqueue(tx_ring->netdev, tx_ring->queue_index);
<------>++tx_ring->tx_stats.restart_queue;
<------>return 0;
}
 
static inline int fm10k_maybe_stop_tx(struct fm10k_ring *tx_ring, u16 size)
{
<------>if (likely(fm10k_desc_unused(tx_ring) >= size))
<------><------>return 0;
<------>return __fm10k_maybe_stop_tx(tx_ring, size);
}
 
static void fm10k_tx_map(struct fm10k_ring *tx_ring,
<------><------><------> struct fm10k_tx_buffer *first)
{
<------>struct sk_buff *skb = first->skb;
<------>struct fm10k_tx_buffer *tx_buffer;
<------>struct fm10k_tx_desc *tx_desc;
<------>skb_frag_t *frag;
<------>unsigned char *data;
<------>dma_addr_t dma;
<------>unsigned int data_len, size;
<------>u32 tx_flags = first->tx_flags;
<------>u16 i = tx_ring->next_to_use;
<------>u8 flags = fm10k_tx_desc_flags(skb, tx_flags);
 
<------>tx_desc = FM10K_TX_DESC(tx_ring, i);
 
<------>/* add HW VLAN tag */
<------>if (skb_vlan_tag_present(skb))
<------><------>tx_desc->vlan = cpu_to_le16(skb_vlan_tag_get(skb));
<------>else
<------><------>tx_desc->vlan = 0;
 
<------>size = skb_headlen(skb);
<------>data = skb->data;
 
<------>dma = dma_map_single(tx_ring->dev, data, size, DMA_TO_DEVICE);
 
<------>data_len = skb->data_len;
<------>tx_buffer = first;
 
<------>for (frag = &skb_shinfo(skb)->frags[0];; frag++) {
<------><------>if (dma_mapping_error(tx_ring->dev, dma))
<------><------><------>goto dma_error;
 
<------><------>/* record length, and DMA address */
<------><------>dma_unmap_len_set(tx_buffer, len, size);
<------><------>dma_unmap_addr_set(tx_buffer, dma, dma);
 
<------><------>while (unlikely(size > FM10K_MAX_DATA_PER_TXD)) {
<------><------><------>if (fm10k_tx_desc_push(tx_ring, tx_desc++, i++, dma,
<------><------><------><------><------>       FM10K_MAX_DATA_PER_TXD, flags)) {
<------><------><------><------>tx_desc = FM10K_TX_DESC(tx_ring, 0);
<------><------><------><------>i = 0;
<------><------><------>}
 
<------><------><------>dma += FM10K_MAX_DATA_PER_TXD;
<------><------><------>size -= FM10K_MAX_DATA_PER_TXD;
<------><------>}
 
<------><------>if (likely(!data_len))
<------><------><------>break;
 
<------><------>if (fm10k_tx_desc_push(tx_ring, tx_desc++, i++,
<------><------><------><------>       dma, size, flags)) {
<------><------><------>tx_desc = FM10K_TX_DESC(tx_ring, 0);
<------><------><------>i = 0;
<------><------>}
 
<------><------>size = skb_frag_size(frag);
<------><------>data_len -= size;
 
<------><------>dma = skb_frag_dma_map(tx_ring->dev, frag, 0, size,
<------><------><------><------>       DMA_TO_DEVICE);
 
<------><------>tx_buffer = &tx_ring->tx_buffer[i];
<------>}
 
<------>/* write last descriptor with LAST bit set */
<------>flags |= FM10K_TXD_FLAG_LAST;
 
<------>if (fm10k_tx_desc_push(tx_ring, tx_desc, i++, dma, size, flags))
<------><------>i = 0;
 
<------>/* record bytecount for BQL */
<------>netdev_tx_sent_queue(txring_txq(tx_ring), first->bytecount);
 
<------>/* record SW timestamp if HW timestamp is not available */
<------>skb_tx_timestamp(first->skb);
 
<------>/* 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).
<------> *
<------> * We also need this memory barrier to make certain all of the
<------> * status bits have been updated before next_to_watch is written.
<------> */
<------>wmb();
 
<------>/* set next_to_watch value indicating a packet is present */
<------>first->next_to_watch = tx_desc;
 
<------>tx_ring->next_to_use = i;
 
<------>/* Make sure there is space in the ring for the next send. */
<------>fm10k_maybe_stop_tx(tx_ring, DESC_NEEDED);
 
<------>/* notify HW of packet */
<------>if (netif_xmit_stopped(txring_txq(tx_ring)) || !netdev_xmit_more()) {
<------><------>writel(i, tx_ring->tail);
<------>}
 
<------>return;
dma_error:
<------>dev_err(tx_ring->dev, "TX DMA map failed\n");
 
<------>/* clear dma mappings for failed tx_buffer map */
<------>for (;;) {
<------><------>tx_buffer = &tx_ring->tx_buffer[i];
<------><------>fm10k_unmap_and_free_tx_resource(tx_ring, tx_buffer);
<------><------>if (tx_buffer == first)
<------><------><------>break;
<------><------>if (i == 0)
<------><------><------>i = tx_ring->count;
<------><------>i--;
<------>}
 
<------>tx_ring->next_to_use = i;
}
 
netdev_tx_t fm10k_xmit_frame_ring(struct sk_buff *skb,
<------><------><------><------>  struct fm10k_ring *tx_ring)
{
<------>u16 count = TXD_USE_COUNT(skb_headlen(skb));
<------>struct fm10k_tx_buffer *first;
<------>unsigned short f;
<------>u32 tx_flags = 0;
<------>int tso;
 
<------>/* need: 1 descriptor per page * PAGE_SIZE/FM10K_MAX_DATA_PER_TXD,
<------> *       + 1 desc for skb_headlen/FM10K_MAX_DATA_PER_TXD,
<------> *       + 2 desc gap to keep tail from touching head
<------> * otherwise try next time
<------> */
<------>for (f = 0; f < skb_shinfo(skb)->nr_frags; f++) {
<------><------>skb_frag_t *frag = &skb_shinfo(skb)->frags[f];
 
<------><------>count += TXD_USE_COUNT(skb_frag_size(frag));
<------>}
 
<------>if (fm10k_maybe_stop_tx(tx_ring, count + 3)) {
<------><------>tx_ring->tx_stats.tx_busy++;
<------><------>return NETDEV_TX_BUSY;
<------>}
 
<------>/* record the location of the first descriptor for this packet */
<------>first = &tx_ring->tx_buffer[tx_ring->next_to_use];
<------>first->skb = skb;
<------>first->bytecount = max_t(unsigned int, skb->len, ETH_ZLEN);
<------>first->gso_segs = 1;
 
<------>/* record initial flags and protocol */
<------>first->tx_flags = tx_flags;
 
<------>tso = fm10k_tso(tx_ring, first);
<------>if (tso < 0)
<------><------>goto out_drop;
<------>else if (!tso)
<------><------>fm10k_tx_csum(tx_ring, first);
 
<------>fm10k_tx_map(tx_ring, first);
 
<------>return NETDEV_TX_OK;
 
out_drop:
<------>dev_kfree_skb_any(first->skb);
<------>first->skb = NULL;
 
<------>return NETDEV_TX_OK;
}
 
static u64 fm10k_get_tx_completed(struct fm10k_ring *ring)
{
<------>return ring->stats.packets;
}
 
/**
 * fm10k_get_tx_pending - how many Tx descriptors not processed
 * @ring: the ring structure
 * @in_sw: is tx_pending being checked in SW or in HW?
 */
u64 fm10k_get_tx_pending(struct fm10k_ring *ring, bool in_sw)
{
<------>struct fm10k_intfc *interface = ring->q_vector->interface;
<------>struct fm10k_hw *hw = &interface->hw;
<------>u32 head, tail;
 
<------>if (likely(in_sw)) {
<------><------>head = ring->next_to_clean;
<------><------>tail = ring->next_to_use;
<------>} else {
<------><------>head = fm10k_read_reg(hw, FM10K_TDH(ring->reg_idx));
<------><------>tail = fm10k_read_reg(hw, FM10K_TDT(ring->reg_idx));
<------>}
 
<------>return ((head <= tail) ? tail : tail + ring->count) - head;
}
 
bool fm10k_check_tx_hang(struct fm10k_ring *tx_ring)
{
<------>u32 tx_done = fm10k_get_tx_completed(tx_ring);
<------>u32 tx_done_old = tx_ring->tx_stats.tx_done_old;
<------>u32 tx_pending = fm10k_get_tx_pending(tx_ring, true);
 
<------>clear_check_for_tx_hang(tx_ring);
 
<------>/* Check for a hung queue, but be thorough. This verifies
<------> * that a transmit has been completed since the previous
<------> * check AND there is at least one packet pending. By
<------> * requiring this to fail twice we avoid races with
<------> * clearing the ARMED bit and conditions where we
<------> * run the check_tx_hang logic with a transmit completion
<------> * pending but without time to complete it yet.
<------> */
<------>if (!tx_pending || (tx_done_old != tx_done)) {
<------><------>/* update completed stats and continue */
<------><------>tx_ring->tx_stats.tx_done_old = tx_done;
<------><------>/* reset the countdown */
<------><------>clear_bit(__FM10K_HANG_CHECK_ARMED, tx_ring->state);
 
<------><------>return false;
<------>}
 
<------>/* make sure it is true for two checks in a row */
<------>return test_and_set_bit(__FM10K_HANG_CHECK_ARMED, tx_ring->state);
}
 
/**
 * fm10k_tx_timeout_reset - initiate reset due to Tx timeout
 * @interface: driver private struct
 **/
void fm10k_tx_timeout_reset(struct fm10k_intfc *interface)
{
<------>/* Do the reset outside of interrupt context */
<------>if (!test_bit(__FM10K_DOWN, interface->state)) {
<------><------>interface->tx_timeout_count++;
<------><------>set_bit(FM10K_FLAG_RESET_REQUESTED, interface->flags);
<------><------>fm10k_service_event_schedule(interface);
<------>}
}
 
/**
 * fm10k_clean_tx_irq - Reclaim resources after transmit completes
 * @q_vector: structure containing interrupt and ring information
 * @tx_ring: tx ring to clean
 * @napi_budget: Used to determine if we are in netpoll
 **/
static bool fm10k_clean_tx_irq(struct fm10k_q_vector *q_vector,
<------><------><------>       struct fm10k_ring *tx_ring, int napi_budget)
{
<------>struct fm10k_intfc *interface = q_vector->interface;
<------>struct fm10k_tx_buffer *tx_buffer;
<------>struct fm10k_tx_desc *tx_desc;
<------>unsigned int total_bytes = 0, total_packets = 0;
<------>unsigned int budget = q_vector->tx.work_limit;
<------>unsigned int i = tx_ring->next_to_clean;
 
<------>if (test_bit(__FM10K_DOWN, interface->state))
<------><------>return true;
 
<------>tx_buffer = &tx_ring->tx_buffer[i];
<------>tx_desc = FM10K_TX_DESC(tx_ring, i);
<------>i -= tx_ring->count;
 
<------>do {
<------><------>struct fm10k_tx_desc *eop_desc = tx_buffer->next_to_watch;
 
<------><------>/* if next_to_watch is not set then there is no work pending */
<------><------>if (!eop_desc)
<------><------><------>break;
 
<------><------>/* prevent any other reads prior to eop_desc */
<------><------>smp_rmb();
 
<------><------>/* if DD is not set pending work has not been completed */
<------><------>if (!(eop_desc->flags & FM10K_TXD_FLAG_DONE))
<------><------><------>break;
 
<------><------>/* clear next_to_watch to prevent false hangs */
<------><------>tx_buffer->next_to_watch = NULL;
 
<------><------>/* update the statistics for this packet */
<------><------>total_bytes += tx_buffer->bytecount;
<------><------>total_packets += tx_buffer->gso_segs;
 
<------><------>/* free the skb */
<------><------>napi_consume_skb(tx_buffer->skb, napi_budget);
 
<------><------>/* unmap skb header data */
<------><------>dma_unmap_single(tx_ring->dev,
<------><------><------><------> dma_unmap_addr(tx_buffer, dma),
<------><------><------><------> dma_unmap_len(tx_buffer, len),
<------><------><------><------> DMA_TO_DEVICE);
 
<------><------>/* clear tx_buffer data */
<------><------>tx_buffer->skb = NULL;
<------><------>dma_unmap_len_set(tx_buffer, len, 0);
 
<------><------>/* unmap remaining buffers */
<------><------>while (tx_desc != eop_desc) {
<------><------><------>tx_buffer++;
<------><------><------>tx_desc++;
<------><------><------>i++;
<------><------><------>if (unlikely(!i)) {
<------><------><------><------>i -= tx_ring->count;
<------><------><------><------>tx_buffer = tx_ring->tx_buffer;
<------><------><------><------>tx_desc = FM10K_TX_DESC(tx_ring, 0);
<------><------><------>}
 
<------><------><------>/* unmap any remaining paged data */
<------><------><------>if (dma_unmap_len(tx_buffer, len)) {
<------><------><------><------>dma_unmap_page(tx_ring->dev,
<------><------><------><------><------>       dma_unmap_addr(tx_buffer, dma),
<------><------><------><------><------>       dma_unmap_len(tx_buffer, len),
<------><------><------><------><------>       DMA_TO_DEVICE);
<------><------><------><------>dma_unmap_len_set(tx_buffer, len, 0);
<------><------><------>}
<------><------>}
 
<------><------>/* move us one more past the eop_desc for start of next pkt */
<------><------>tx_buffer++;
<------><------>tx_desc++;
<------><------>i++;
<------><------>if (unlikely(!i)) {
<------><------><------>i -= tx_ring->count;
<------><------><------>tx_buffer = tx_ring->tx_buffer;
<------><------><------>tx_desc = FM10K_TX_DESC(tx_ring, 0);
<------><------>}
 
<------><------>/* issue prefetch for next Tx descriptor */
<------><------>prefetch(tx_desc);
 
<------><------>/* update budget accounting */
<------><------>budget--;
<------>} while (likely(budget));
 
<------>i += tx_ring->count;
<------>tx_ring->next_to_clean = i;
<------>u64_stats_update_begin(&tx_ring->syncp);
<------>tx_ring->stats.bytes += total_bytes;
<------>tx_ring->stats.packets += total_packets;
<------>u64_stats_update_end(&tx_ring->syncp);
<------>q_vector->tx.total_bytes += total_bytes;
<------>q_vector->tx.total_packets += total_packets;
 
<------>if (check_for_tx_hang(tx_ring) && fm10k_check_tx_hang(tx_ring)) {
<------><------>/* schedule immediate reset if we believe we hung */
<------><------>struct fm10k_hw *hw = &interface->hw;
 
<------><------>netif_err(interface, drv, tx_ring->netdev,
<------><------><------>  "Detected Tx Unit Hang\n"
<------><------><------>  "  Tx Queue             <%d>\n"
<------><------><------>  "  TDH, TDT             <%x>, <%x>\n"
<------><------><------>  "  next_to_use          <%x>\n"
<------><------><------>  "  next_to_clean        <%x>\n",
<------><------><------>  tx_ring->queue_index,
<------><------><------>  fm10k_read_reg(hw, FM10K_TDH(tx_ring->reg_idx)),
<------><------><------>  fm10k_read_reg(hw, FM10K_TDT(tx_ring->reg_idx)),
<------><------><------>  tx_ring->next_to_use, i);
 
<------><------>netif_stop_subqueue(tx_ring->netdev,
<------><------><------><------>    tx_ring->queue_index);
 
<------><------>netif_info(interface, probe, tx_ring->netdev,
<------><------><------>   "tx hang %d detected on queue %d, resetting interface\n",
<------><------><------>   interface->tx_timeout_count + 1,
<------><------><------>   tx_ring->queue_index);
 
<------><------>fm10k_tx_timeout_reset(interface);
 
<------><------>/* the netdev is about to reset, no point in enabling stuff */
<------><------>return true;
<------>}
 
<------>/* notify netdev of completed buffers */
<------>netdev_tx_completed_queue(txring_txq(tx_ring),
<------><------><------><------>  total_packets, total_bytes);
 
#define TX_WAKE_THRESHOLD min_t(u16, FM10K_MIN_TXD - 1, DESC_NEEDED * 2)
<------>if (unlikely(total_packets && netif_carrier_ok(tx_ring->netdev) &&
<------><------>     (fm10k_desc_unused(tx_ring) >= TX_WAKE_THRESHOLD))) {
<------><------>/* Make sure that anybody stopping the queue after this
<------><------> * sees the new next_to_clean.
<------><------> */
<------><------>smp_mb();
<------><------>if (__netif_subqueue_stopped(tx_ring->netdev,
<------><------><------><------><------>     tx_ring->queue_index) &&
<------><------>    !test_bit(__FM10K_DOWN, interface->state)) {
<------><------><------>netif_wake_subqueue(tx_ring->netdev,
<------><------><------><------><------>    tx_ring->queue_index);
<------><------><------>++tx_ring->tx_stats.restart_queue;
<------><------>}
<------>}
 
<------>return !!budget;
}
 
/**
 * fm10k_update_itr - update the dynamic ITR value based on packet size
 *
 *      Stores a new ITR value based on strictly on packet size.  The
 *      divisors and thresholds used by this function were determined based
 *      on theoretical maximum wire speed and testing data, in order to
 *      minimize response time while increasing bulk throughput.
 *
 * @ring_container: Container for rings to have ITR updated
 **/
static void fm10k_update_itr(struct fm10k_ring_container *ring_container)
{
<------>unsigned int avg_wire_size, packets, itr_round;
 
<------>/* Only update ITR if we are using adaptive setting */
<------>if (!ITR_IS_ADAPTIVE(ring_container->itr))
<------><------>goto clear_counts;
 
<------>packets = ring_container->total_packets;
<------>if (!packets)
<------><------>goto clear_counts;
 
<------>avg_wire_size = ring_container->total_bytes / packets;
 
<------>/* The following is a crude approximation of:
<------> *  wmem_default / (size + overhead) = desired_pkts_per_int
<------> *  rate / bits_per_byte / (size + ethernet overhead) = pkt_rate
<------> *  (desired_pkt_rate / pkt_rate) * usecs_per_sec = ITR value
<------> *
<------> * Assuming wmem_default is 212992 and overhead is 640 bytes per
<------> * packet, (256 skb, 64 headroom, 320 shared info), we can reduce the
<------> * formula down to
<------> *
<------> *  (34 * (size + 24)) / (size + 640) = ITR
<------> *
<------> * We first do some math on the packet size and then finally bitshift
<------> * by 8 after rounding up. We also have to account for PCIe link speed
<------> * difference as ITR scales based on this.
<------> */
<------>if (avg_wire_size <= 360) {
<------><------>/* Start at 250K ints/sec and gradually drop to 77K ints/sec */
<------><------>avg_wire_size *= 8;
<------><------>avg_wire_size += 376;
<------>} else if (avg_wire_size <= 1152) {
<------><------>/* 77K ints/sec to 45K ints/sec */
<------><------>avg_wire_size *= 3;
<------><------>avg_wire_size += 2176;
<------>} else if (avg_wire_size <= 1920) {
<------><------>/* 45K ints/sec to 38K ints/sec */
<------><------>avg_wire_size += 4480;
<------>} else {
<------><------>/* plateau at a limit of 38K ints/sec */
<------><------>avg_wire_size = 6656;
<------>}
 
<------>/* Perform final bitshift for division after rounding up to ensure
<------> * that the calculation will never get below a 1. The bit shift
<------> * accounts for changes in the ITR due to PCIe link speed.
<------> */
<------>itr_round = READ_ONCE(ring_container->itr_scale) + 8;
<------>avg_wire_size += BIT(itr_round) - 1;
<------>avg_wire_size >>= itr_round;
 
<------>/* write back value and retain adaptive flag */
<------>ring_container->itr = avg_wire_size | FM10K_ITR_ADAPTIVE;
 
clear_counts:
<------>ring_container->total_bytes = 0;
<------>ring_container->total_packets = 0;
}
 
static void fm10k_qv_enable(struct fm10k_q_vector *q_vector)
{
<------>/* Enable auto-mask and clear the current mask */
<------>u32 itr = FM10K_ITR_ENABLE;
 
<------>/* Update Tx ITR */
<------>fm10k_update_itr(&q_vector->tx);
 
<------>/* Update Rx ITR */
<------>fm10k_update_itr(&q_vector->rx);
 
<------>/* Store Tx itr in timer slot 0 */
<------>itr |= (q_vector->tx.itr & FM10K_ITR_MAX);
 
<------>/* Shift Rx itr to timer slot 1 */
<------>itr |= (q_vector->rx.itr & FM10K_ITR_MAX) << FM10K_ITR_INTERVAL1_SHIFT;
 
<------>/* Write the final value to the ITR register */
<------>writel(itr, q_vector->itr);
}
 
static int fm10k_poll(struct napi_struct *napi, int budget)
{
<------>struct fm10k_q_vector *q_vector =
<------><------><------>       container_of(napi, struct fm10k_q_vector, napi);
<------>struct fm10k_ring *ring;
<------>int per_ring_budget, work_done = 0;
<------>bool clean_complete = true;
 
<------>fm10k_for_each_ring(ring, q_vector->tx) {
<------><------>if (!fm10k_clean_tx_irq(q_vector, ring, budget))
<------><------><------>clean_complete = false;
<------>}
 
<------>/* Handle case where we are called by netpoll with a budget of 0 */
<------>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;
 
<------>fm10k_for_each_ring(ring, q_vector->rx) {
<------><------>int work = fm10k_clean_rx_irq(q_vector, ring, per_ring_budget);
 
<------><------>work_done += work;
<------><------>if (work >= per_ring_budget)
<------><------><------>clean_complete = false;
<------>}
 
<------>/* If all work not completed, return budget and keep polling */
<------>if (!clean_complete)
<------><------>return budget;
 
<------>/* Exit the polling mode, but don't re-enable interrupts if stack might
<------> * poll us due to busy-polling
<------> */
<------>if (likely(napi_complete_done(napi, work_done)))
<------><------>fm10k_qv_enable(q_vector);
 
<------>return min(work_done, budget - 1);
}
 
/**
 * fm10k_set_qos_queues: Allocate queues for a QOS-enabled device
 * @interface: board private structure to initialize
 *
 * When QoS (Quality of Service) is enabled, allocate queues for
 * each traffic class.  If multiqueue isn't available,then abort QoS
 * initialization.
 *
 * This function handles all combinations of Qos and RSS.
 *
 **/
static bool fm10k_set_qos_queues(struct fm10k_intfc *interface)
{
<------>struct net_device *dev = interface->netdev;
<------>struct fm10k_ring_feature *f;
<------>int rss_i, i;
<------>int pcs;
 
<------>/* Map queue offset and counts onto allocated tx queues */
<------>pcs = netdev_get_num_tc(dev);
 
<------>if (pcs <= 1)
<------><------>return false;
 
<------>/* set QoS mask and indices */
<------>f = &interface->ring_feature[RING_F_QOS];
<------>f->indices = pcs;
<------>f->mask = BIT(fls(pcs - 1)) - 1;
 
<------>/* determine the upper limit for our current DCB mode */
<------>rss_i = interface->hw.mac.max_queues / pcs;
<------>rss_i = BIT(fls(rss_i) - 1);
 
<------>/* set RSS mask and indices */
<------>f = &interface->ring_feature[RING_F_RSS];
<------>rss_i = min_t(u16, rss_i, f->limit);
<------>f->indices = rss_i;
<------>f->mask = BIT(fls(rss_i - 1)) - 1;
 
<------>/* configure pause class to queue mapping */
<------>for (i = 0; i < pcs; i++)
<------><------>netdev_set_tc_queue(dev, i, rss_i, rss_i * i);
 
<------>interface->num_rx_queues = rss_i * pcs;
<------>interface->num_tx_queues = rss_i * pcs;
 
<------>return true;
}
 
/**
 * fm10k_set_rss_queues: Allocate queues for RSS
 * @interface: board private structure to initialize
 *
 * This is our "base" multiqueue mode.  RSS (Receive Side Scaling) will try
 * to allocate one Rx queue per CPU, and if available, one Tx queue per CPU.
 *
 **/
static bool fm10k_set_rss_queues(struct fm10k_intfc *interface)
{
<------>struct fm10k_ring_feature *f;
<------>u16 rss_i;
 
<------>f = &interface->ring_feature[RING_F_RSS];
<------>rss_i = min_t(u16, interface->hw.mac.max_queues, f->limit);
 
<------>/* record indices and power of 2 mask for RSS */
<------>f->indices = rss_i;
<------>f->mask = BIT(fls(rss_i - 1)) - 1;
 
<------>interface->num_rx_queues = rss_i;
<------>interface->num_tx_queues = rss_i;
 
<------>return true;
}
 
/**
 * fm10k_set_num_queues: Allocate queues for device, feature dependent
 * @interface: board private structure to initialize
 *
 * This is the top level queue allocation routine.  The order here is very
 * important, starting with the "most" number of features turned on at once,
 * and ending with the smallest set of features.  This way large combinations
 * can be allocated if they're turned on, and smaller combinations are the
 * fall through conditions.
 *
 **/
static void fm10k_set_num_queues(struct fm10k_intfc *interface)
{
<------>/* Attempt to setup QoS and RSS first */
<------>if (fm10k_set_qos_queues(interface))
<------><------>return;
 
<------>/* If we don't have QoS, just fallback to only RSS. */
<------>fm10k_set_rss_queues(interface);
}
 
/**
 * fm10k_reset_num_queues - Reset the number of queues to zero
 * @interface: board private structure
 *
 * This function should be called whenever we need to reset the number of
 * queues after an error condition.
 */
static void fm10k_reset_num_queues(struct fm10k_intfc *interface)
{
<------>interface->num_tx_queues = 0;
<------>interface->num_rx_queues = 0;
<------>interface->num_q_vectors = 0;
}
 
/**
 * fm10k_alloc_q_vector - Allocate memory for a single interrupt vector
 * @interface: board private structure to initialize
 * @v_count: q_vectors allocated on interface, used for ring interleaving
 * @v_idx: index of vector in interface struct
 * @txr_count: total number of Tx rings to allocate
 * @txr_idx: index of first Tx ring to allocate
 * @rxr_count: total number of Rx rings to allocate
 * @rxr_idx: index of first Rx ring to allocate
 *
 * We allocate one q_vector.  If allocation fails we return -ENOMEM.
 **/
static int fm10k_alloc_q_vector(struct fm10k_intfc *interface,
<------><------><------><------>unsigned int v_count, unsigned int v_idx,
<------><------><------><------>unsigned int txr_count, unsigned int txr_idx,
<------><------><------><------>unsigned int rxr_count, unsigned int rxr_idx)
{
<------>struct fm10k_q_vector *q_vector;
<------>struct fm10k_ring *ring;
<------>int ring_count;
 
<------>ring_count = txr_count + rxr_count;
 
<------>/* allocate q_vector and rings */
<------>q_vector = kzalloc(struct_size(q_vector, ring, ring_count), GFP_KERNEL);
<------>if (!q_vector)
<------><------>return -ENOMEM;
 
<------>/* initialize NAPI */
<------>netif_napi_add(interface->netdev, &q_vector->napi,
<------><------>       fm10k_poll, NAPI_POLL_WEIGHT);
 
<------>/* tie q_vector and interface together */
<------>interface->q_vector[v_idx] = q_vector;
<------>q_vector->interface = interface;
<------>q_vector->v_idx = v_idx;
 
<------>/* initialize pointer to rings */
<------>ring = q_vector->ring;
 
<------>/* save Tx ring container info */
<------>q_vector->tx.ring = ring;
<------>q_vector->tx.work_limit = FM10K_DEFAULT_TX_WORK;
<------>q_vector->tx.itr = interface->tx_itr;
<------>q_vector->tx.itr_scale = interface->hw.mac.itr_scale;
<------>q_vector->tx.count = txr_count;
 
<------>while (txr_count) {
<------><------>/* assign generic ring traits */
<------><------>ring->dev = &interface->pdev->dev;
<------><------>ring->netdev = interface->netdev;
 
<------><------>/* configure backlink on ring */
<------><------>ring->q_vector = q_vector;
 
<------><------>/* apply Tx specific ring traits */
<------><------>ring->count = interface->tx_ring_count;
<------><------>ring->queue_index = txr_idx;
 
<------><------>/* assign ring to interface */
<------><------>interface->tx_ring[txr_idx] = ring;
 
<------><------>/* update count and index */
<------><------>txr_count--;
<------><------>txr_idx += v_count;
 
<------><------>/* push pointer to next ring */
<------><------>ring++;
<------>}
 
<------>/* save Rx ring container info */
<------>q_vector->rx.ring = ring;
<------>q_vector->rx.itr = interface->rx_itr;
<------>q_vector->rx.itr_scale = interface->hw.mac.itr_scale;
<------>q_vector->rx.count = rxr_count;
 
<------>while (rxr_count) {
<------><------>/* assign generic ring traits */
<------><------>ring->dev = &interface->pdev->dev;
<------><------>ring->netdev = interface->netdev;
<------><------>rcu_assign_pointer(ring->l2_accel, interface->l2_accel);
 
<------><------>/* configure backlink on ring */
<------><------>ring->q_vector = q_vector;
 
<------><------>/* apply Rx specific ring traits */
<------><------>ring->count = interface->rx_ring_count;
<------><------>ring->queue_index = rxr_idx;
 
<------><------>/* assign ring to interface */
<------><------>interface->rx_ring[rxr_idx] = ring;
 
<------><------>/* update count and index */
<------><------>rxr_count--;
<------><------>rxr_idx += v_count;
 
<------><------>/* push pointer to next ring */
<------><------>ring++;
<------>}
 
<------>fm10k_dbg_q_vector_init(q_vector);
 
<------>return 0;
}
 
/**
 * fm10k_free_q_vector - Free memory allocated for specific interrupt vector
 * @interface: board private structure to initialize
 * @v_idx: Index of vector to be freed
 *
 * This function frees the memory allocated to the q_vector.  In addition if
 * NAPI is enabled it will delete any references to the NAPI struct prior
 * to freeing the q_vector.
 **/
static void fm10k_free_q_vector(struct fm10k_intfc *interface, int v_idx)
{
<------>struct fm10k_q_vector *q_vector = interface->q_vector[v_idx];
<------>struct fm10k_ring *ring;
 
<------>fm10k_dbg_q_vector_exit(q_vector);
 
<------>fm10k_for_each_ring(ring, q_vector->tx)
<------><------>interface->tx_ring[ring->queue_index] = NULL;
 
<------>fm10k_for_each_ring(ring, q_vector->rx)
<------><------>interface->rx_ring[ring->queue_index] = NULL;
 
<------>interface->q_vector[v_idx] = NULL;
<------>netif_napi_del(&q_vector->napi);
<------>kfree_rcu(q_vector, rcu);
}
 
/**
 * fm10k_alloc_q_vectors - Allocate memory for interrupt vectors
 * @interface: board private structure to initialize
 *
 * We allocate one q_vector per queue interrupt.  If allocation fails we
 * return -ENOMEM.
 **/
static int fm10k_alloc_q_vectors(struct fm10k_intfc *interface)
{
<------>unsigned int q_vectors = interface->num_q_vectors;
<------>unsigned int rxr_remaining = interface->num_rx_queues;
<------>unsigned int txr_remaining = interface->num_tx_queues;
<------>unsigned int rxr_idx = 0, txr_idx = 0, v_idx = 0;
<------>int err;
 
<------>if (q_vectors >= (rxr_remaining + txr_remaining)) {
<------><------>for (; rxr_remaining; v_idx++) {
<------><------><------>err = fm10k_alloc_q_vector(interface, q_vectors, v_idx,
<------><------><------><------><------><------>   0, 0, 1, rxr_idx);
<------><------><------>if (err)
<------><------><------><------>goto err_out;
 
<------><------><------>/* update counts and index */
<------><------><------>rxr_remaining--;
<------><------><------>rxr_idx++;
<------><------>}
<------>}
 
<------>for (; v_idx < q_vectors; v_idx++) {
<------><------>int rqpv = DIV_ROUND_UP(rxr_remaining, q_vectors - v_idx);
<------><------>int tqpv = DIV_ROUND_UP(txr_remaining, q_vectors - v_idx);
 
<------><------>err = fm10k_alloc_q_vector(interface, q_vectors, v_idx,
<------><------><------><------><------>   tqpv, txr_idx,
<------><------><------><------><------>   rqpv, rxr_idx);
 
<------><------>if (err)
<------><------><------>goto err_out;
 
<------><------>/* update counts and index */
<------><------>rxr_remaining -= rqpv;
<------><------>txr_remaining -= tqpv;
<------><------>rxr_idx++;
<------><------>txr_idx++;
<------>}
 
<------>return 0;
 
err_out:
<------>fm10k_reset_num_queues(interface);
 
<------>while (v_idx--)
<------><------>fm10k_free_q_vector(interface, v_idx);
 
<------>return -ENOMEM;
}
 
/**
 * fm10k_free_q_vectors - Free memory allocated for interrupt vectors
 * @interface: board private structure to initialize
 *
 * This function frees the memory allocated to the q_vectors.  In addition if
 * NAPI is enabled it will delete any references to the NAPI struct prior
 * to freeing the q_vector.
 **/
static void fm10k_free_q_vectors(struct fm10k_intfc *interface)
{
<------>int v_idx = interface->num_q_vectors;
 
<------>fm10k_reset_num_queues(interface);
 
<------>while (v_idx--)
<------><------>fm10k_free_q_vector(interface, v_idx);
}
 
/**
 * f10k_reset_msix_capability - reset MSI-X capability
 * @interface: board private structure to initialize
 *
 * Reset the MSI-X capability back to its starting state
 **/
static void fm10k_reset_msix_capability(struct fm10k_intfc *interface)
{
<------>pci_disable_msix(interface->pdev);
<------>kfree(interface->msix_entries);
<------>interface->msix_entries = NULL;
}
 
/**
 * f10k_init_msix_capability - configure MSI-X capability
 * @interface: board private structure to initialize
 *
 * Attempt to configure the interrupts using the best available
 * capabilities of the hardware and the kernel.
 **/
static int fm10k_init_msix_capability(struct fm10k_intfc *interface)
{
<------>struct fm10k_hw *hw = &interface->hw;
<------>int v_budget, vector;
 
<------>/* It's easy to be greedy for MSI-X vectors, but it really
<------> * doesn't do us much good if we have a lot more vectors
<------> * than CPU's.  So let's be conservative and only ask for
<------> * (roughly) the same number of vectors as there are CPU's.
<------> * the default is to use pairs of vectors
<------> */
<------>v_budget = max(interface->num_rx_queues, interface->num_tx_queues);
<------>v_budget = min_t(u16, v_budget, num_online_cpus());
 
<------>/* account for vectors not related to queues */
<------>v_budget += NON_Q_VECTORS;
 
<------>/* At the same time, hardware can only support a maximum of
<------> * hw.mac->max_msix_vectors vectors.  With features
<------> * such as RSS and VMDq, we can easily surpass the number of Rx and Tx
<------> * descriptor queues supported by our device.  Thus, we cap it off in
<------> * those rare cases where the cpu count also exceeds our vector limit.
<------> */
<------>v_budget = min_t(int, v_budget, hw->mac.max_msix_vectors);
 
<------>/* A failure in MSI-X entry allocation is fatal. */
<------>interface->msix_entries = kcalloc(v_budget, sizeof(struct msix_entry),
<------><------><------><------><------>  GFP_KERNEL);
<------>if (!interface->msix_entries)
<------><------>return -ENOMEM;
 
<------>/* populate entry values */
<------>for (vector = 0; vector < v_budget; vector++)
<------><------>interface->msix_entries[vector].entry = vector;
 
<------>/* Attempt to enable MSI-X with requested value */
<------>v_budget = pci_enable_msix_range(interface->pdev,
<------><------><------><------><------> interface->msix_entries,
<------><------><------><------><------> MIN_MSIX_COUNT(hw),
<------><------><------><------><------> v_budget);
<------>if (v_budget < 0) {
<------><------>kfree(interface->msix_entries);
<------><------>interface->msix_entries = NULL;
<------><------>return v_budget;
<------>}
 
<------>/* record the number of queues available for q_vectors */
<------>interface->num_q_vectors = v_budget - NON_Q_VECTORS;
 
<------>return 0;
}
 
/**
 * fm10k_cache_ring_qos - Descriptor ring to register mapping for QoS
 * @interface: Interface structure continaining rings and devices
 *
 * Cache the descriptor ring offsets for Qos
 **/
static bool fm10k_cache_ring_qos(struct fm10k_intfc *interface)
{
<------>struct net_device *dev = interface->netdev;
<------>int pc, offset, rss_i, i;
<------>u16 pc_stride = interface->ring_feature[RING_F_QOS].mask + 1;
<------>u8 num_pcs = netdev_get_num_tc(dev);
 
<------>if (num_pcs <= 1)
<------><------>return false;
 
<------>rss_i = interface->ring_feature[RING_F_RSS].indices;
 
<------>for (pc = 0, offset = 0; pc < num_pcs; pc++, offset += rss_i) {
<------><------>int q_idx = pc;
 
<------><------>for (i = 0; i < rss_i; i++) {
<------><------><------>interface->tx_ring[offset + i]->reg_idx = q_idx;
<------><------><------>interface->tx_ring[offset + i]->qos_pc = pc;
<------><------><------>interface->rx_ring[offset + i]->reg_idx = q_idx;
<------><------><------>interface->rx_ring[offset + i]->qos_pc = pc;
<------><------><------>q_idx += pc_stride;
<------><------>}
<------>}
 
<------>return true;
}
 
/**
 * fm10k_cache_ring_rss - Descriptor ring to register mapping for RSS
 * @interface: Interface structure continaining rings and devices
 *
 * Cache the descriptor ring offsets for RSS
 **/
static void fm10k_cache_ring_rss(struct fm10k_intfc *interface)
{
<------>int i;
 
<------>for (i = 0; i < interface->num_rx_queues; i++)
<------><------>interface->rx_ring[i]->reg_idx = i;
 
<------>for (i = 0; i < interface->num_tx_queues; i++)
<------><------>interface->tx_ring[i]->reg_idx = i;
}
 
/**
 * fm10k_assign_rings - Map rings to network devices
 * @interface: Interface structure containing rings and devices
 *
 * This function is meant to go though and configure both the network
 * devices so that they contain rings, and configure the rings so that
 * they function with their network devices.
 **/
static void fm10k_assign_rings(struct fm10k_intfc *interface)
{
<------>if (fm10k_cache_ring_qos(interface))
<------><------>return;
 
<------>fm10k_cache_ring_rss(interface);
}
 
static void fm10k_init_reta(struct fm10k_intfc *interface)
{
<------>u16 i, rss_i = interface->ring_feature[RING_F_RSS].indices;
<------>u32 reta;
 
<------>/* If the Rx flow indirection table has been configured manually, we
<------> * need to maintain it when possible.
<------> */
<------>if (netif_is_rxfh_configured(interface->netdev)) {
<------><------>for (i = FM10K_RETA_SIZE; i--;) {
<------><------><------>reta = interface->reta[i];
<------><------><------>if ((((reta << 24) >> 24) < rss_i) &&
<------><------><------>    (((reta << 16) >> 24) < rss_i) &&
<------><------><------>    (((reta <<  8) >> 24) < rss_i) &&
<------><------><------>    (((reta)       >> 24) < rss_i))
<------><------><------><------>continue;
 
<------><------><------>/* this should never happen */
<------><------><------>dev_err(&interface->pdev->dev,
<------><------><------><------>"RSS indirection table assigned flows out of queue bounds. Reconfiguring.\n");
<------><------><------>goto repopulate_reta;
<------><------>}
 
<------><------>/* do nothing if all of the elements are in bounds */
<------><------>return;
<------>}
 
repopulate_reta:
<------>fm10k_write_reta(interface, NULL);
}
 
/**
 * fm10k_init_queueing_scheme - Determine proper queueing scheme
 * @interface: board private structure to initialize
 *
 * We determine which queueing scheme to use based on...
 * - Hardware queue count (num_*_queues)
 *   - defined by miscellaneous hardware support/features (RSS, etc.)
 **/
int fm10k_init_queueing_scheme(struct fm10k_intfc *interface)
{
<------>int err;
 
<------>/* Number of supported queues */
<------>fm10k_set_num_queues(interface);
 
<------>/* Configure MSI-X capability */
<------>err = fm10k_init_msix_capability(interface);
<------>if (err) {
<------><------>dev_err(&interface->pdev->dev,
<------><------><------>"Unable to initialize MSI-X capability\n");
<------><------>goto err_init_msix;
<------>}
 
<------>/* Allocate memory for queues */
<------>err = fm10k_alloc_q_vectors(interface);
<------>if (err) {
<------><------>dev_err(&interface->pdev->dev,
<------><------><------>"Unable to allocate queue vectors\n");
<------><------>goto err_alloc_q_vectors;
<------>}
 
<------>/* Map rings to devices, and map devices to physical queues */
<------>fm10k_assign_rings(interface);
 
<------>/* Initialize RSS redirection table */
<------>fm10k_init_reta(interface);
 
<------>return 0;
 
err_alloc_q_vectors:
<------>fm10k_reset_msix_capability(interface);
err_init_msix:
<------>fm10k_reset_num_queues(interface);
<------>return err;
}
 
/**
 * fm10k_clear_queueing_scheme - Clear the current queueing scheme settings
 * @interface: board private structure to clear queueing scheme on
 *
 * We go through and clear queueing specific resources and reset the structure
 * to pre-load conditions
 **/
void fm10k_clear_queueing_scheme(struct fm10k_intfc *interface)
{
<------>fm10k_free_q_vectors(interface);
<------>fm10k_reset_msix_capability(interface);
}