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- /* Intel Ethernet Switch Host Interface Driver
- * Copyright(c) 2013 - 2014 Intel Corporation.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- *
- * The full GNU General Public License is included in this distribution in
- * the file called "COPYING".
- *
- * Contact Information:
- * e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
- * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
- */
- #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_VERSION "0.15.2-k"
- const char fm10k_driver_version[] = DRV_VERSION;
- char fm10k_driver_name[] = "fm10k";
- static const char fm10k_driver_string[] =
- "Intel(R) Ethernet Switch Host Interface Driver";
- static const char fm10k_copyright[] =
- "Copyright (c) 2013 Intel Corporation.";
- MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
- MODULE_DESCRIPTION("Intel(R) Ethernet Switch Host Interface Driver");
- MODULE_LICENSE("GPL");
- MODULE_VERSION(DRV_VERSION);
- /* single workqueue for entire fm10k driver */
- struct workqueue_struct *fm10k_workqueue = NULL;
- /**
- * 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 - version %s\n", fm10k_driver_string, fm10k_driver_version);
- pr_info("%s\n", fm10k_copyright);
- /* create driver workqueue */
- if (!fm10k_workqueue)
- fm10k_workqueue = create_workqueue("fm10k");
- 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 */
- flush_workqueue(fm10k_workqueue);
- destroy_workqueue(fm10k_workqueue);
- fm10k_workqueue = NULL;
- }
- 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.
- */
- atomic_inc(&page->_count);
- return true;
- }
- /**
- * fm10k_add_rx_frag - Add contents of Rx buffer to sk_buff
- * @rx_buffer: buffer containing page to add
- * @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,
- 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;
- unsigned int size = le16_to_cpu(rx_desc->w.length);
- #if (PAGE_SIZE < 8192)
- unsigned int truesize = FM10K_RX_BUFSZ;
- #else
- unsigned int truesize = SKB_DATA_ALIGN(size);
- #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(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)
- {
- 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 */
- 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,
- 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,
- FM10K_RX_BUFSZ,
- DMA_FROM_DEVICE);
- /* pull page into skb */
- if (fm10k_add_rx_frag(rx_buffer, 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 \
- ((1ul << FM10K_RSSTYPE_IPV4_TCP) | \
- (1ul << FM10K_RSSTYPE_IPV4_UDP) | \
- (1ul << FM10K_RSSTYPE_IPV6_TCP) | \
- (1ul << 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),
- (FM10K_RSS_L4_TYPES_MASK & (1ul << rss_type)) ?
- PKT_HASH_TYPE_L4 : PKT_HASH_TYPE_L3);
- }
- static void fm10k_rx_hwtstamp(struct fm10k_ring *rx_ring,
- union fm10k_rx_desc *rx_desc,
- struct sk_buff *skb)
- {
- struct fm10k_intfc *interface = rx_ring->q_vector->interface;
- FM10K_CB(skb)->tstamp = rx_desc->q.timestamp;
- if (unlikely(interface->flags & FM10K_FLAG_RX_TS_ENABLED))
- fm10k_systime_to_hwtstamp(interface, skb_hwtstamps(skb),
- le64_to_cpu(rx_desc->q.timestamp));
- }
- 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;
- }
- skb->protocol = eth_type_trans(skb, dev);
- if (!l2_accel)
- return;
- /* update MACVLAN statistics */
- macvlan_count_rx(netdev_priv(dev), skb->len + ETH_HLEN, 1,
- !!(rx_desc->w.hdr_info &
- cpu_to_le16(FM10K_RXD_HDR_INFO_XC_MASK)));
- }
- /**
- * 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_rx_hwtstamp(rx_ring, rx_desc, skb);
- FM10K_CB(skb)->fi.w.vlan = rx_desc->w.vlan;
- skb_record_rx_queue(skb, rx_ring->queue_index);
- 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);
- struct fm10k_vxlan_port *vxlan_port;
- /* we can only offload a vxlan if we recognize it as such */
- vxlan_port = list_first_entry_or_null(&interface->vxlan_port,
- struct fm10k_vxlan_port, list);
- if (!vxlan_port)
- return NULL;
- if (vxlan_port->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;
- __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);
- } else {
- protocol = vlan_get_protocol(skb);
- network_hdr.raw = skb_network_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;
- break;
- default:
- if (unlikely(net_ratelimit())) {
- dev_warn(tx_ring->dev,
- "partial checksum but ip version=%x!\n",
- protocol);
- }
- tx_ring->tx_stats.csum_err++;
- goto no_csum;
- }
- switch (l4_hdr) {
- case IPPROTO_TCP:
- case IPPROTO_UDP:
- break;
- case IPPROTO_GRE:
- if (skb->encapsulation)
- break;
- default:
- if (unlikely(net_ratelimit())) {
- dev_warn(tx_ring->dev,
- "partial checksum but l4 proto=%x!\n",
- l4_hdr);
- }
- 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 timestamping bits */
- if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP) &&
- likely(skb_shinfo(skb)->tx_flags & SKBTX_IN_PROGRESS))
- desc_flags |= FM10K_TXD_FLAG_TIME;
- /* 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;
- struct skb_frag_struct *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)) || !skb->xmit_more) {
- writel(i, tx_ring->tail);
- /* we need this if more than one processor can write to our tail
- * at a time, it synchronizes IO on IA64/Altix systems
- */
- mmiowb();
- }
- 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)
- {
- struct fm10k_tx_buffer *first;
- int tso;
- u32 tx_flags = 0;
- unsigned short f;
- u16 count = TXD_USE_COUNT(skb_headlen(skb));
- /* 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++)
- count += TXD_USE_COUNT(skb_shinfo(skb)->frags[f].size);
- 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;
- }
- static u64 fm10k_get_tx_pending(struct fm10k_ring *ring)
- {
- /* use SW head and tail until we have real hardware */
- u32 head = ring->next_to_clean;
- u32 tail = ring->next_to_use;
- 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);
- 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++;
- interface->flags |= FM10K_FLAG_RESET_REQUESTED;
- 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
- **/
- static bool fm10k_clean_tx_irq(struct fm10k_q_vector *q_vector,
- struct fm10k_ring *tx_ring)
- {
- 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 */
- dev_consume_skb_any(tx_buffer->skb);
- /* 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;
- /* Only update ITR if we are using adaptive setting */
- if (!(ring_container->itr & FM10K_ITR_ADAPTIVE))
- goto clear_counts;
- packets = ring_container->total_packets;
- if (!packets)
- goto clear_counts;
- avg_wire_size = ring_container->total_bytes / packets;
- /* Add 24 bytes to size to account for CRC, preamble, and gap */
- avg_wire_size += 24;
- /* Don't starve jumbo frames */
- if (avg_wire_size > 3000)
- avg_wire_size = 3000;
- /* Give a little boost to mid-size frames */
- if ((avg_wire_size > 300) && (avg_wire_size < 1200))
- avg_wire_size /= 3;
- else
- avg_wire_size /= 2;
- /* 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)
- clean_complete &= fm10k_clean_tx_irq(q_vector, ring);
- /* 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;
- clean_complete &= !!(work < per_ring_budget);
- }
- /* If all work not completed, return budget and keep polling */
- if (!clean_complete)
- return budget;
- /* all work done, exit the polling mode */
- napi_complete_done(napi, work_done);
- /* re-enable the q_vector */
- fm10k_qv_enable(q_vector);
- return 0;
- }
- /**
- * 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 = (1 << fls(pcs - 1)) - 1;
- /* determine the upper limit for our current DCB mode */
- rss_i = interface->hw.mac.max_queues / pcs;
- rss_i = 1 << (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 = (1 << 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 = (1 << 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
- * fallthrough conditions.
- *
- **/
- static void fm10k_set_num_queues(struct fm10k_intfc *interface)
- {
- /* Start with base case */
- interface->num_rx_queues = 1;
- interface->num_tx_queues = 1;
- if (fm10k_set_qos_queues(interface))
- return;
- fm10k_set_rss_queues(interface);
- }
- /**
- * 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, size;
- ring_count = txr_count + rxr_count;
- size = sizeof(struct fm10k_q_vector) +
- (sizeof(struct fm10k_ring) * ring_count);
- /* allocate q_vector and rings */
- q_vector = kzalloc(size, 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.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.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:
- interface->num_tx_queues = 0;
- interface->num_rx_queues = 0;
- interface->num_q_vectors = 0;
- 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;
- interface->num_tx_queues = 0;
- interface->num_rx_queues = 0;
- interface->num_q_vectors = 0;
- 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(hw);
- /* 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 -ENOMEM;
- }
- /* record the number of queues available for q_vectors */
- interface->num_q_vectors = v_budget - NON_Q_VECTORS(hw);
- 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, q_idx;
- 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) {
- 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, base;
- /* If the netdev is initialized we have to maintain table if possible */
- if (interface->netdev->reg_state != NETREG_UNINITIALIZED) {
- 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;
- goto repopulate_reta;
- }
- /* do nothing if all of the elements are in bounds */
- return;
- }
- repopulate_reta:
- /* Populate the redirection table 4 entries at a time. To do this
- * we are generating the results for n and n+2 and then interleaving
- * those with the results with n+1 and n+3.
- */
- for (i = FM10K_RETA_SIZE; i--;) {
- /* first pass generates n and n+2 */
- base = ((i * 0x00040004) + 0x00020000) * rss_i;
- reta = (base & 0x3F803F80) >> 7;
- /* second pass generates n+1 and n+3 */
- base += 0x00010001 * rss_i;
- reta |= (base & 0x3F803F80) << 1;
- interface->reta[i] = reta;
- }
- }
- /**
- * 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");
- return err;
- }
- /* Allocate memory for queues */
- err = fm10k_alloc_q_vectors(interface);
- if (err) {
- fm10k_reset_msix_capability(interface);
- return err;
- }
- /* Map rings to devices, and map devices to physical queues */
- fm10k_assign_rings(interface);
- /* Initialize RSS redirection table */
- fm10k_init_reta(interface);
- return 0;
- }
- /**
- * 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);
- }
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