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	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // SPDX-License-Identifier: GPL-2.0
 /* Copyright (c) 2018, Intel Corporation. */
 
 /* The driver transmit and receive code */
 
 #include <linux/mm.h>
 #include <linux/netdevice.h>
 #include <linux/prefetch.h>
 #include <linux/bpf_trace.h>
 #include <net/dsfield.h>
 #include <net/mpls.h>
 #include <net/xdp.h>
 #include "ice_txrx_lib.h"
 #include "ice_lib.h"
 #include "ice.h"
 #include "ice_trace.h"
 #include "ice_dcb_lib.h"
 #include "ice_xsk.h"
 #include "ice_eswitch.h"
 
 #define ICE_RX_HDR_SIZE     256
 
 #define FDIR_DESC_RXDID 0x40
 #define ICE_FDIR_CLEAN_DELAY 10
 
 /**
  * ice_prgm_fdir_fltr - Program a Flow Director filter
  * @vsi: VSI to send dummy packet
  * @fdir_desc: flow director descriptor
  * @raw_packet: allocated buffer for flow director
  */
 int
 ice_prgm_fdir_fltr(struct ice_vsi *vsi, struct ice_fltr_desc *fdir_desc,
            u8 *raw_packet)
 {
     struct ice_tx_buf *tx_buf, *first;
     struct ice_fltr_desc *f_desc;
     struct ice_tx_desc *tx_desc;
     struct ice_tx_ring *tx_ring;
     struct device *dev;
     dma_addr_t dma;
     u32 td_cmd;
     u16 i;
 
     /* VSI and Tx ring */
     if (!vsi)
         return -ENOENT;
     tx_ring = vsi->tx_rings[0];
     if (!tx_ring || !tx_ring->desc)
         return -ENOENT;
     dev = tx_ring->dev;
 
     /* we are using two descriptors to add/del a filter and we can wait */
     for (i = ICE_FDIR_CLEAN_DELAY; ICE_DESC_UNUSED(tx_ring) < 2; i--) {
         if (!i)
             return -EAGAIN;
         msleep_interruptible(1);
     }
 
     dma = dma_map_single(dev, raw_packet, ICE_FDIR_MAX_RAW_PKT_SIZE,
                  DMA_TO_DEVICE);
 
     if (dma_mapping_error(dev, dma))
         return -EINVAL;
 
     /* grab the next descriptor */
     i = tx_ring->next_to_use;
     first = &tx_ring->tx_buf[i];
     f_desc = ICE_TX_FDIRDESC(tx_ring, i);
     memcpy(f_desc, fdir_desc, sizeof(*f_desc));
 
     i++;
     i = (i < tx_ring->count) ? i : 0;
     tx_desc = ICE_TX_DESC(tx_ring, i);
     tx_buf = &tx_ring->tx_buf[i];
 
     i++;
     tx_ring->next_to_use = (i < tx_ring->count) ? i : 0;
 
     memset(tx_buf, 0, sizeof(*tx_buf));
     dma_unmap_len_set(tx_buf, len, ICE_FDIR_MAX_RAW_PKT_SIZE);
     dma_unmap_addr_set(tx_buf, dma, dma);
 
     tx_desc->buf_addr = cpu_to_le64(dma);
     td_cmd = ICE_TXD_LAST_DESC_CMD | ICE_TX_DESC_CMD_DUMMY |
          ICE_TX_DESC_CMD_RE;
 
     tx_buf->tx_flags = ICE_TX_FLAGS_DUMMY_PKT;
     tx_buf->raw_buf = raw_packet;
 
     tx_desc->cmd_type_offset_bsz =
         ice_build_ctob(td_cmd, 0, ICE_FDIR_MAX_RAW_PKT_SIZE, 0);
 
     /* Force memory write to complete before letting h/w know
      * there are new descriptors to fetch.
      */
     wmb();
 
     /* mark the data descriptor to be watched */
     first->next_to_watch = tx_desc;
 
     writel(tx_ring->next_to_use, tx_ring->tail);
 
     return 0;
 }
 
 /**
  * ice_unmap_and_free_tx_buf - Release a Tx buffer
  * @ring: the ring that owns the buffer
  * @tx_buf: the buffer to free
  */
 static void
 ice_unmap_and_free_tx_buf(struct ice_tx_ring *ring, struct ice_tx_buf *tx_buf)
 {
     if (tx_buf->skb) {
         if (tx_buf->tx_flags & ICE_TX_FLAGS_DUMMY_PKT)
             devm_kfree(ring->dev, tx_buf->raw_buf);
         else if (ice_ring_is_xdp(ring))
             page_frag_free(tx_buf->raw_buf);
         else
             dev_kfree_skb_any(tx_buf->skb);
         if (dma_unmap_len(tx_buf, len))
             dma_unmap_single(ring->dev,
                      dma_unmap_addr(tx_buf, dma),
                      dma_unmap_len(tx_buf, len),
                      DMA_TO_DEVICE);
     } else if (dma_unmap_len(tx_buf, len)) {
         dma_unmap_page(ring->dev,
                    dma_unmap_addr(tx_buf, dma),
                    dma_unmap_len(tx_buf, len),
                    DMA_TO_DEVICE);
     }
 
     tx_buf->next_to_watch = NULL;
     tx_buf->skb = NULL;
     dma_unmap_len_set(tx_buf, len, 0);
     /* tx_buf must be completely set up in the transmit path */
 }
 
 static struct netdev_queue *txring_txq(const struct ice_tx_ring *ring)
 {
     return netdev_get_tx_queue(ring->netdev, ring->q_index);
 }
 
 /**
  * ice_clean_tx_ring - Free any empty Tx buffers
  * @tx_ring: ring to be cleaned
  */
 void ice_clean_tx_ring(struct ice_tx_ring *tx_ring)
 {
     u32 size;
     u16 i;
 
     if (ice_ring_is_xdp(tx_ring) && tx_ring->xsk_pool) {
         ice_xsk_clean_xdp_ring(tx_ring);
         goto tx_skip_free;
     }
 
     /* ring already cleared, nothing to do */
     if (!tx_ring->tx_buf)
         return;
 
     /* Free all the Tx ring sk_buffs */
     for (i = 0; i < tx_ring->count; i++)
         ice_unmap_and_free_tx_buf(tx_ring, &tx_ring->tx_buf[i]);
 
 tx_skip_free:
     memset(tx_ring->tx_buf, 0, sizeof(*tx_ring->tx_buf) * tx_ring->count);
 
     size = ALIGN(tx_ring->count * sizeof(struct ice_tx_desc),
              PAGE_SIZE);
     /* Zero out the descriptor ring */
     memset(tx_ring->desc, 0, size);
 
     tx_ring->next_to_use = 0;
     tx_ring->next_to_clean = 0;
     tx_ring->next_dd = ICE_RING_QUARTER(tx_ring) - 1;
     tx_ring->next_rs = ICE_RING_QUARTER(tx_ring) - 1;
 
     if (!tx_ring->netdev)
         return;
 
     /* cleanup Tx queue statistics */
     netdev_tx_reset_queue(txring_txq(tx_ring));
 }
 
 /**
  * ice_free_tx_ring - Free Tx resources per queue
  * @tx_ring: Tx descriptor ring for a specific queue
  *
  * Free all transmit software resources
  */
 void ice_free_tx_ring(struct ice_tx_ring *tx_ring)
 {
     u32 size;
 
     ice_clean_tx_ring(tx_ring);
     devm_kfree(tx_ring->dev, tx_ring->tx_buf);
     tx_ring->tx_buf = NULL;
 
     if (tx_ring->desc) {
         size = ALIGN(tx_ring->count * sizeof(struct ice_tx_desc),
                  PAGE_SIZE);
         dmam_free_coherent(tx_ring->dev, size,
                    tx_ring->desc, tx_ring->dma);
         tx_ring->desc = NULL;
     }
 }
 
 /**
  * ice_clean_tx_irq - Reclaim resources after transmit completes
  * @tx_ring: Tx ring to clean
  * @napi_budget: Used to determine if we are in netpoll
  *
  * Returns true if there's any budget left (e.g. the clean is finished)
  */
 static bool ice_clean_tx_irq(struct ice_tx_ring *tx_ring, int napi_budget)
 {
     unsigned int total_bytes = 0, total_pkts = 0;
     unsigned int budget = ICE_DFLT_IRQ_WORK;
     struct ice_vsi *vsi = tx_ring->vsi;
     s16 i = tx_ring->next_to_clean;
     struct ice_tx_desc *tx_desc;
     struct ice_tx_buf *tx_buf;
 
     /* get the bql data ready */
     netdev_txq_bql_complete_prefetchw(txring_txq(tx_ring));
 
     tx_buf = &tx_ring->tx_buf[i];
     tx_desc = ICE_TX_DESC(tx_ring, i);
     i -= tx_ring->count;
 
     prefetch(&vsi->state);
 
     do {
         struct ice_tx_desc *eop_desc = tx_buf->next_to_watch;
 
         /* if next_to_watch is not set then there is no work pending */
         if (!eop_desc)
             break;
 
         /* follow the guidelines of other drivers */
         prefetchw(&tx_buf->skb->users);
 
         smp_rmb();  /* prevent any other reads prior to eop_desc */
 
         ice_trace(clean_tx_irq, tx_ring, tx_desc, tx_buf);
         /* if the descriptor isn't done, no work yet to do */
         if (!(eop_desc->cmd_type_offset_bsz &
               cpu_to_le64(ICE_TX_DESC_DTYPE_DESC_DONE)))
             break;
 
         /* clear next_to_watch to prevent false hangs */
         tx_buf->next_to_watch = NULL;
 
         /* update the statistics for this packet */
         total_bytes += tx_buf->bytecount;
         total_pkts += tx_buf->gso_segs;
 
         /* free the skb */
         napi_consume_skb(tx_buf->skb, napi_budget);
 
         /* unmap skb header data */
         dma_unmap_single(tx_ring->dev,
                  dma_unmap_addr(tx_buf, dma),
                  dma_unmap_len(tx_buf, len),
                  DMA_TO_DEVICE);
 
         /* clear tx_buf data */
         tx_buf->skb = NULL;
         dma_unmap_len_set(tx_buf, len, 0);
 
         /* unmap remaining buffers */
         while (tx_desc != eop_desc) {
             ice_trace(clean_tx_irq_unmap, tx_ring, tx_desc, tx_buf);
             tx_buf++;
             tx_desc++;
             i++;
             if (unlikely(!i)) {
                 i -= tx_ring->count;
                 tx_buf = tx_ring->tx_buf;
                 tx_desc = ICE_TX_DESC(tx_ring, 0);
             }
 
             /* unmap any remaining paged data */
             if (dma_unmap_len(tx_buf, len)) {
                 dma_unmap_page(tx_ring->dev,
                            dma_unmap_addr(tx_buf, dma),
                            dma_unmap_len(tx_buf, len),
                            DMA_TO_DEVICE);
                 dma_unmap_len_set(tx_buf, len, 0);
             }
         }
         ice_trace(clean_tx_irq_unmap_eop, tx_ring, tx_desc, tx_buf);
 
         /* move us one more past the eop_desc for start of next pkt */
         tx_buf++;
         tx_desc++;
         i++;
         if (unlikely(!i)) {
             i -= tx_ring->count;
             tx_buf = tx_ring->tx_buf;
             tx_desc = ICE_TX_DESC(tx_ring, 0);
         }
 
         prefetch(tx_desc);
 
         /* update budget accounting */
         budget--;
     } while (likely(budget));
 
     i += tx_ring->count;
     tx_ring->next_to_clean = i;
 
     ice_update_tx_ring_stats(tx_ring, total_pkts, total_bytes);
     netdev_tx_completed_queue(txring_txq(tx_ring), total_pkts, total_bytes);
 
 #define TX_WAKE_THRESHOLD ((s16)(DESC_NEEDED * 2))
     if (unlikely(total_pkts && netif_carrier_ok(tx_ring->netdev) &&
              (ICE_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_tx_queue_stopped(txring_txq(tx_ring)) &&
             !test_bit(ICE_VSI_DOWN, vsi->state)) {
             netif_tx_wake_queue(txring_txq(tx_ring));
             ++tx_ring->tx_stats.restart_q;
         }
     }
 
     return !!budget;
 }
 
 /**
  * ice_setup_tx_ring - Allocate the Tx descriptors
  * @tx_ring: the Tx ring to set up
  *
  * Return 0 on success, negative on error
  */
 int ice_setup_tx_ring(struct ice_tx_ring *tx_ring)
 {
     struct device *dev = tx_ring->dev;
     u32 size;
 
     if (!dev)
         return -ENOMEM;
 
     /* warn if we are about to overwrite the pointer */
     WARN_ON(tx_ring->tx_buf);
     tx_ring->tx_buf =
         devm_kcalloc(dev, sizeof(*tx_ring->tx_buf), tx_ring->count,
                  GFP_KERNEL);
     if (!tx_ring->tx_buf)
         return -ENOMEM;
 
     /* round up to nearest page */
     size = ALIGN(tx_ring->count * sizeof(struct ice_tx_desc),
              PAGE_SIZE);
     tx_ring->desc = dmam_alloc_coherent(dev, size, &tx_ring->dma,
                         GFP_KERNEL);
     if (!tx_ring->desc) {
         dev_err(dev, "Unable to allocate memory for the Tx descriptor ring, size=%d\n",
             size);
         goto err;
     }
 
     tx_ring->next_to_use = 0;
     tx_ring->next_to_clean = 0;
     tx_ring->tx_stats.prev_pkt = -1;
     return 0;
 
 err:
     devm_kfree(dev, tx_ring->tx_buf);
     tx_ring->tx_buf = NULL;
     return -ENOMEM;
 }
 
 /**
  * ice_clean_rx_ring - Free Rx buffers
  * @rx_ring: ring to be cleaned
  */
 void ice_clean_rx_ring(struct ice_rx_ring *rx_ring)
 {
     struct device *dev = rx_ring->dev;
     u32 size;
     u16 i;
 
     /* ring already cleared, nothing to do */
     if (!rx_ring->rx_buf)
         return;
 
     if (rx_ring->skb) {
         dev_kfree_skb(rx_ring->skb);
         rx_ring->skb = NULL;
     }
 
     if (rx_ring->xsk_pool) {
         ice_xsk_clean_rx_ring(rx_ring);
         goto rx_skip_free;
     }
 
     /* Free all the Rx ring sk_buffs */
     for (i = 0; i < rx_ring->count; i++) {
         struct ice_rx_buf *rx_buf = &rx_ring->rx_buf[i];
 
         if (!rx_buf->page)
             continue;
 
         /* Invalidate cache lines that may have been written to by
          * device so that we avoid corrupting memory.
          */
         dma_sync_single_range_for_cpu(dev, rx_buf->dma,
                           rx_buf->page_offset,
                           rx_ring->rx_buf_len,
                           DMA_FROM_DEVICE);
 
         /* free resources associated with mapping */
         dma_unmap_page_attrs(dev, rx_buf->dma, ice_rx_pg_size(rx_ring),
                      DMA_FROM_DEVICE, ICE_RX_DMA_ATTR);
         __page_frag_cache_drain(rx_buf->page, rx_buf->pagecnt_bias);
 
         rx_buf->page = NULL;
         rx_buf->page_offset = 0;
     }
 
 rx_skip_free:
     if (rx_ring->xsk_pool)
         memset(rx_ring->xdp_buf, 0, array_size(rx_ring->count, sizeof(*rx_ring->xdp_buf)));
     else
         memset(rx_ring->rx_buf, 0, array_size(rx_ring->count, sizeof(*rx_ring->rx_buf)));
 
     /* Zero out the descriptor ring */
     size = ALIGN(rx_ring->count * sizeof(union ice_32byte_rx_desc),
              PAGE_SIZE);
     memset(rx_ring->desc, 0, size);
 
     rx_ring->next_to_alloc = 0;
     rx_ring->next_to_clean = 0;
     rx_ring->next_to_use = 0;
 }
 
 /**
  * ice_free_rx_ring - Free Rx resources
  * @rx_ring: ring to clean the resources from
  *
  * Free all receive software resources
  */
 void ice_free_rx_ring(struct ice_rx_ring *rx_ring)
 {
     u32 size;
 
     ice_clean_rx_ring(rx_ring);
     if (rx_ring->vsi->type == ICE_VSI_PF)
         if (xdp_rxq_info_is_reg(&rx_ring->xdp_rxq))
             xdp_rxq_info_unreg(&rx_ring->xdp_rxq);
     rx_ring->xdp_prog = NULL;
     if (rx_ring->xsk_pool) {
         kfree(rx_ring->xdp_buf);
         rx_ring->xdp_buf = NULL;
     } else {
         kfree(rx_ring->rx_buf);
         rx_ring->rx_buf = NULL;
     }
 
     if (rx_ring->desc) {
         size = ALIGN(rx_ring->count * sizeof(union ice_32byte_rx_desc),
                  PAGE_SIZE);
         dmam_free_coherent(rx_ring->dev, size,
                    rx_ring->desc, rx_ring->dma);
         rx_ring->desc = NULL;
     }
 }
 
 /**
  * ice_setup_rx_ring - Allocate the Rx descriptors
  * @rx_ring: the Rx ring to set up
  *
  * Return 0 on success, negative on error
  */
 int ice_setup_rx_ring(struct ice_rx_ring *rx_ring)
 {
     struct device *dev = rx_ring->dev;
     u32 size;
 
     if (!dev)
         return -ENOMEM;
 
     /* warn if we are about to overwrite the pointer */
     WARN_ON(rx_ring->rx_buf);
     rx_ring->rx_buf =
         kcalloc(rx_ring->count, sizeof(*rx_ring->rx_buf), GFP_KERNEL);
     if (!rx_ring->rx_buf)
         return -ENOMEM;
 
     /* round up to nearest page */
     size = ALIGN(rx_ring->count * sizeof(union ice_32byte_rx_desc),
              PAGE_SIZE);
     rx_ring->desc = dmam_alloc_coherent(dev, size, &rx_ring->dma,
                         GFP_KERNEL);
     if (!rx_ring->desc) {
         dev_err(dev, "Unable to allocate memory for the Rx descriptor ring, size=%d\n",
             size);
         goto err;
     }
 
     rx_ring->next_to_use = 0;
     rx_ring->next_to_clean = 0;
 
     if (ice_is_xdp_ena_vsi(rx_ring->vsi))
         WRITE_ONCE(rx_ring->xdp_prog, rx_ring->vsi->xdp_prog);
 
     if (rx_ring->vsi->type == ICE_VSI_PF &&
         !xdp_rxq_info_is_reg(&rx_ring->xdp_rxq))
         if (xdp_rxq_info_reg(&rx_ring->xdp_rxq, rx_ring->netdev,
                      rx_ring->q_index, rx_ring->q_vector->napi.napi_id))
             goto err;
     return 0;
 
 err:
     kfree(rx_ring->rx_buf);
     rx_ring->rx_buf = NULL;
     return -ENOMEM;
 }
 
 static unsigned int
 ice_rx_frame_truesize(struct ice_rx_ring *rx_ring, unsigned int __maybe_unused size)
 {
     unsigned int truesize;
 
 #if (PAGE_SIZE < 8192)
     truesize = ice_rx_pg_size(rx_ring) / 2; /* Must be power-of-2 */
 #else
     truesize = rx_ring->rx_offset ?
         SKB_DATA_ALIGN(rx_ring->rx_offset + size) +
         SKB_DATA_ALIGN(sizeof(struct skb_shared_info)) :
         SKB_DATA_ALIGN(size);
 #endif
     return truesize;
 }
 
 /**
  * ice_run_xdp - Executes an XDP program on initialized xdp_buff
  * @rx_ring: Rx ring
  * @xdp: xdp_buff used as input to the XDP program
  * @xdp_prog: XDP program to run
  * @xdp_ring: ring to be used for XDP_TX action
  *
  * Returns any of ICE_XDP_{PASS, CONSUMED, TX, REDIR}
  */
 static int
 ice_run_xdp(struct ice_rx_ring *rx_ring, struct xdp_buff *xdp,
         struct bpf_prog *xdp_prog, struct ice_tx_ring *xdp_ring)
 {
     int err;
     u32 act;
 
     act = bpf_prog_run_xdp(xdp_prog, xdp);
     switch (act) {
     case XDP_PASS:
         return ICE_XDP_PASS;
     case XDP_TX:
         if (static_branch_unlikely(&ice_xdp_locking_key))
             spin_lock(&xdp_ring->tx_lock);
         err = ice_xmit_xdp_ring(xdp->data, xdp->data_end - xdp->data, xdp_ring);
         if (static_branch_unlikely(&ice_xdp_locking_key))
             spin_unlock(&xdp_ring->tx_lock);
         if (err == ICE_XDP_CONSUMED)
             goto out_failure;
         return err;
     case XDP_REDIRECT:
         err = xdp_do_redirect(rx_ring->netdev, xdp, xdp_prog);
         if (err)
             goto out_failure;
         return ICE_XDP_REDIR;
     default:
         bpf_warn_invalid_xdp_action(rx_ring->netdev, xdp_prog, act);
         fallthrough;
     case XDP_ABORTED:
 out_failure:
         trace_xdp_exception(rx_ring->netdev, xdp_prog, act);
         fallthrough;
     case XDP_DROP:
         return ICE_XDP_CONSUMED;
     }
 }
 
 /**
  * ice_xdp_xmit - submit packets to XDP ring for transmission
  * @dev: netdev
  * @n: number of XDP frames to be transmitted
  * @frames: XDP frames to be transmitted
  * @flags: transmit flags
  *
  * Returns number of frames successfully sent. Failed frames
  * will be free'ed by XDP core.
  * For error cases, a negative errno code is returned and no-frames
  * are transmitted (caller must handle freeing frames).
  */
 int
 ice_xdp_xmit(struct net_device *dev, int n, struct xdp_frame **frames,
          u32 flags)
 {
     struct ice_netdev_priv *np = netdev_priv(dev);
     unsigned int queue_index = smp_processor_id();
     struct ice_vsi *vsi = np->vsi;
     struct ice_tx_ring *xdp_ring;
     int nxmit = 0, i;
 
     if (test_bit(ICE_VSI_DOWN, vsi->state))
         return -ENETDOWN;
 
     if (!ice_is_xdp_ena_vsi(vsi))
         return -ENXIO;
 
     if (unlikely(flags & ~XDP_XMIT_FLAGS_MASK))
         return -EINVAL;
 
     if (static_branch_unlikely(&ice_xdp_locking_key)) {
         queue_index %= vsi->num_xdp_txq;
         xdp_ring = vsi->xdp_rings[queue_index];
         spin_lock(&xdp_ring->tx_lock);
     } else {
         /* Generally, should not happen */
         if (unlikely(queue_index >= vsi->num_xdp_txq))
             return -ENXIO;
         xdp_ring = vsi->xdp_rings[queue_index];
     }
 
     for (i = 0; i < n; i++) {
         struct xdp_frame *xdpf = frames[i];
         int err;
 
         err = ice_xmit_xdp_ring(xdpf->data, xdpf->len, xdp_ring);
         if (err != ICE_XDP_TX)
             break;
         nxmit++;
     }
 
     if (unlikely(flags & XDP_XMIT_FLUSH))
         ice_xdp_ring_update_tail(xdp_ring);
 
     if (static_branch_unlikely(&ice_xdp_locking_key))
         spin_unlock(&xdp_ring->tx_lock);
 
     return nxmit;
 }
 
 /**
  * ice_alloc_mapped_page - recycle or make a new page
  * @rx_ring: ring to use
  * @bi: rx_buf struct to modify
  *
  * Returns true if the page was successfully allocated or
  * reused.
  */
 static bool
 ice_alloc_mapped_page(struct ice_rx_ring *rx_ring, struct ice_rx_buf *bi)
 {
     struct page *page = bi->page;
     dma_addr_t dma;
 
     /* since we are recycling buffers we should seldom need to alloc */
     if (likely(page))
         return true;
 
     /* alloc new page for storage */
     page = dev_alloc_pages(ice_rx_pg_order(rx_ring));
     if (unlikely(!page)) {
         rx_ring->rx_stats.alloc_page_failed++;
         return false;
     }
 
     /* map page for use */
     dma = dma_map_page_attrs(rx_ring->dev, page, 0, ice_rx_pg_size(rx_ring),
                  DMA_FROM_DEVICE, ICE_RX_DMA_ATTR);
 
     /* 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_pages(page, ice_rx_pg_order(rx_ring));
         rx_ring->rx_stats.alloc_page_failed++;
         return false;
     }
 
     bi->dma = dma;
     bi->page = page;
     bi->page_offset = rx_ring->rx_offset;
     page_ref_add(page, USHRT_MAX - 1);
     bi->pagecnt_bias = USHRT_MAX;
 
     return true;
 }
 
 /**
  * ice_alloc_rx_bufs - Replace used receive buffers
  * @rx_ring: ring to place buffers on
  * @cleaned_count: number of buffers to replace
  *
  * Returns false if all allocations were successful, true if any fail. Returning
  * true signals to the caller that we didn't replace cleaned_count buffers and
  * there is more work to do.
  *
  * First, try to clean "cleaned_count" Rx buffers. Then refill the cleaned Rx
  * buffers. Then bump tail at most one time. Grouping like this lets us avoid
  * multiple tail writes per call.
  */
 bool ice_alloc_rx_bufs(struct ice_rx_ring *rx_ring, u16 cleaned_count)
 {
     union ice_32b_rx_flex_desc *rx_desc;
     u16 ntu = rx_ring->next_to_use;
     struct ice_rx_buf *bi;
 
     /* do nothing if no valid netdev defined */
     if ((!rx_ring->netdev && rx_ring->vsi->type != ICE_VSI_CTRL) ||
         !cleaned_count)
         return false;
 
     /* get the Rx descriptor and buffer based on next_to_use */
     rx_desc = ICE_RX_DESC(rx_ring, ntu);
     bi = &rx_ring->rx_buf[ntu];
 
     do {
         /* if we fail here, we have work remaining */
         if (!ice_alloc_mapped_page(rx_ring, bi))
             break;
 
         /* sync the buffer for use by the device */
         dma_sync_single_range_for_device(rx_ring->dev, bi->dma,
                          bi->page_offset,
                          rx_ring->rx_buf_len,
                          DMA_FROM_DEVICE);
 
         /* Refresh the desc even if buffer_addrs didn't change
          * because each write-back erases this info.
          */
         rx_desc->read.pkt_addr = cpu_to_le64(bi->dma + bi->page_offset);
 
         rx_desc++;
         bi++;
         ntu++;
         if (unlikely(ntu == rx_ring->count)) {
             rx_desc = ICE_RX_DESC(rx_ring, 0);
             bi = rx_ring->rx_buf;
             ntu = 0;
         }
 
         /* clear the status bits for the next_to_use descriptor */
         rx_desc->wb.status_error0 = 0;
 
         cleaned_count--;
     } while (cleaned_count);
 
     if (rx_ring->next_to_use != ntu)
         ice_release_rx_desc(rx_ring, ntu);
 
     return !!cleaned_count;
 }
 
 /**
  * ice_rx_buf_adjust_pg_offset - Prepare Rx buffer for reuse
  * @rx_buf: Rx buffer to adjust
  * @size: Size of adjustment
  *
  * Update the offset within page so that Rx buf will be ready to be reused.
  * For systems with PAGE_SIZE < 8192 this function will flip the page offset
  * so the second half of page assigned to Rx buffer will be used, otherwise
  * the offset is moved by "size" bytes
  */
 static void
 ice_rx_buf_adjust_pg_offset(struct ice_rx_buf *rx_buf, unsigned int size)
 {
 #if (PAGE_SIZE < 8192)
     /* flip page offset to other buffer */
     rx_buf->page_offset ^= size;
 #else
     /* move offset up to the next cache line */
     rx_buf->page_offset += size;
 #endif
 }
 
 /**
  * ice_can_reuse_rx_page - Determine if page can be reused for another Rx
  * @rx_buf: buffer containing the page
  * @rx_buf_pgcnt: rx_buf page refcount pre xdp_do_redirect() call
  *
  * If page is reusable, we have a green light for calling ice_reuse_rx_page,
  * which will assign the current buffer to the buffer that next_to_alloc is
  * pointing to; otherwise, the DMA mapping needs to be destroyed and
  * page freed
  */
 static bool
 ice_can_reuse_rx_page(struct ice_rx_buf *rx_buf, int rx_buf_pgcnt)
 {
     unsigned int pagecnt_bias = rx_buf->pagecnt_bias;
     struct page *page = rx_buf->page;
 
     /* avoid re-using remote and pfmemalloc pages */
     if (!dev_page_is_reusable(page))
         return false;
 
 #if (PAGE_SIZE < 8192)
     /* if we are only owner of page we can reuse it */
     if (unlikely((rx_buf_pgcnt - pagecnt_bias) > 1))
         return false;
 #else
 #define ICE_LAST_OFFSET \
     (SKB_WITH_OVERHEAD(PAGE_SIZE) - ICE_RXBUF_2048)
     if (rx_buf->page_offset > ICE_LAST_OFFSET)
         return false;
 #endif /* PAGE_SIZE < 8192) */
 
     /* If we have drained the page fragment pool we need to update
      * the pagecnt_bias and page count so that we fully restock the
      * number of references the driver holds.
      */
     if (unlikely(pagecnt_bias == 1)) {
         page_ref_add(page, USHRT_MAX - 1);
         rx_buf->pagecnt_bias = USHRT_MAX;
     }
 
     return true;
 }
 
 /**
  * ice_add_rx_frag - Add contents of Rx buffer to sk_buff as a frag
  * @rx_ring: Rx descriptor ring to transact packets on
  * @rx_buf: buffer containing page to add
  * @skb: sk_buff to place the data into
  * @size: packet length from rx_desc
  *
  * This function will add the data contained in rx_buf->page to the skb.
  * It will just attach the page as a frag to the skb.
  * The function will then update the page offset.
  */
 static void
 ice_add_rx_frag(struct ice_rx_ring *rx_ring, struct ice_rx_buf *rx_buf,
         struct sk_buff *skb, unsigned int size)
 {
 #if (PAGE_SIZE >= 8192)
     unsigned int truesize = SKB_DATA_ALIGN(size + rx_ring->rx_offset);
 #else
     unsigned int truesize = ice_rx_pg_size(rx_ring) / 2;
 #endif
 
     if (!size)
         return;
     skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, rx_buf->page,
             rx_buf->page_offset, size, truesize);
 
     /* page is being used so we must update the page offset */
     ice_rx_buf_adjust_pg_offset(rx_buf, truesize);
 }
 
 /**
  * ice_reuse_rx_page - page flip buffer and store it back on the ring
  * @rx_ring: Rx descriptor ring to store buffers on
  * @old_buf: donor buffer to have page reused
  *
  * Synchronizes page for reuse by the adapter
  */
 static void
 ice_reuse_rx_page(struct ice_rx_ring *rx_ring, struct ice_rx_buf *old_buf)
 {
     u16 nta = rx_ring->next_to_alloc;
     struct ice_rx_buf *new_buf;
 
     new_buf = &rx_ring->rx_buf[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.
      * Move each member individually to avoid possible store
      * forwarding stalls and unnecessary copy of skb.
      */
     new_buf->dma = old_buf->dma;
     new_buf->page = old_buf->page;
     new_buf->page_offset = old_buf->page_offset;
     new_buf->pagecnt_bias = old_buf->pagecnt_bias;
 }
 
 /**
  * ice_get_rx_buf - Fetch Rx buffer and synchronize data for use
  * @rx_ring: Rx descriptor ring to transact packets on
  * @size: size of buffer to add to skb
  * @rx_buf_pgcnt: rx_buf page refcount
  *
  * This function will pull an Rx buffer from the ring and synchronize it
  * for use by the CPU.
  */
 static struct ice_rx_buf *
 ice_get_rx_buf(struct ice_rx_ring *rx_ring, const unsigned int size,
            int *rx_buf_pgcnt)
 {
     struct ice_rx_buf *rx_buf;
 
     rx_buf = &rx_ring->rx_buf[rx_ring->next_to_clean];
     *rx_buf_pgcnt =
 #if (PAGE_SIZE < 8192)
         page_count(rx_buf->page);
 #else
         0;
 #endif
     prefetchw(rx_buf->page);
 
     if (!size)
         return rx_buf;
     /* we are reusing so sync this buffer for CPU use */
     dma_sync_single_range_for_cpu(rx_ring->dev, rx_buf->dma,
                       rx_buf->page_offset, size,
                       DMA_FROM_DEVICE);
 
     /* We have pulled a buffer for use, so decrement pagecnt_bias */
     rx_buf->pagecnt_bias--;
 
     return rx_buf;
 }
 
 /**
  * ice_build_skb - Build skb around an existing buffer
  * @rx_ring: Rx descriptor ring to transact packets on
  * @rx_buf: Rx buffer to pull data from
  * @xdp: xdp_buff pointing to the data
  *
  * This function builds an skb around an existing Rx buffer, taking care
  * to set up the skb correctly and avoid any memcpy overhead.
  */
 static struct sk_buff *
 ice_build_skb(struct ice_rx_ring *rx_ring, struct ice_rx_buf *rx_buf,
           struct xdp_buff *xdp)
 {
     u8 metasize = xdp->data - xdp->data_meta;
 #if (PAGE_SIZE < 8192)
     unsigned int truesize = ice_rx_pg_size(rx_ring) / 2;
 #else
     unsigned int truesize = SKB_DATA_ALIGN(sizeof(struct skb_shared_info)) +
                 SKB_DATA_ALIGN(xdp->data_end -
                            xdp->data_hard_start);
 #endif
     struct sk_buff *skb;
 
     /* Prefetch first cache line of first page. If xdp->data_meta
      * is unused, this points exactly as xdp->data, otherwise we
      * likely have a consumer accessing first few bytes of meta
      * data, and then actual data.
      */
     net_prefetch(xdp->data_meta);
     /* build an skb around the page buffer */
     skb = napi_build_skb(xdp->data_hard_start, truesize);
     if (unlikely(!skb))
         return NULL;
 
     /* must to record Rx queue, otherwise OS features such as
      * symmetric queue won't work
      */
     skb_record_rx_queue(skb, rx_ring->q_index);
 
     /* update pointers within the skb to store the data */
     skb_reserve(skb, xdp->data - xdp->data_hard_start);
     __skb_put(skb, xdp->data_end - xdp->data);
     if (metasize)
         skb_metadata_set(skb, metasize);
 
     /* buffer is used by skb, update page_offset */
     ice_rx_buf_adjust_pg_offset(rx_buf, truesize);
 
     return skb;
 }
 
 /**
  * ice_construct_skb - Allocate skb and populate it
  * @rx_ring: Rx descriptor ring to transact packets on
  * @rx_buf: Rx buffer to pull data from
  * @xdp: xdp_buff pointing to the data
  *
  * This function allocates an skb. It then populates it with the page
  * data from the current receive descriptor, taking care to set up the
  * skb correctly.
  */
 static struct sk_buff *
 ice_construct_skb(struct ice_rx_ring *rx_ring, struct ice_rx_buf *rx_buf,
           struct xdp_buff *xdp)
 {
     unsigned int metasize = xdp->data - xdp->data_meta;
     unsigned int size = xdp->data_end - xdp->data;
     unsigned int headlen;
     struct sk_buff *skb;
 
     /* prefetch first cache line of first page */
     net_prefetch(xdp->data_meta);
 
     /* allocate a skb to store the frags */
     skb = __napi_alloc_skb(&rx_ring->q_vector->napi,
                    ICE_RX_HDR_SIZE + metasize,
                    GFP_ATOMIC | __GFP_NOWARN);
     if (unlikely(!skb))
         return NULL;
 
     skb_record_rx_queue(skb, rx_ring->q_index);
     /* Determine available headroom for copy */
     headlen = size;
     if (headlen > ICE_RX_HDR_SIZE)
         headlen = eth_get_headlen(skb->dev, xdp->data, ICE_RX_HDR_SIZE);
 
     /* align pull length to size of long to optimize memcpy performance */
     memcpy(__skb_put(skb, headlen + metasize), xdp->data_meta,
            ALIGN(headlen + metasize, sizeof(long)));
 
     if (metasize) {
         skb_metadata_set(skb, metasize);
         __skb_pull(skb, metasize);
     }
 
     /* if we exhaust the linear part then add what is left as a frag */
     size -= headlen;
     if (size) {
 #if (PAGE_SIZE >= 8192)
         unsigned int truesize = SKB_DATA_ALIGN(size);
 #else
         unsigned int truesize = ice_rx_pg_size(rx_ring) / 2;
 #endif
         skb_add_rx_frag(skb, 0, rx_buf->page,
                 rx_buf->page_offset + headlen, size, truesize);
         /* buffer is used by skb, update page_offset */
         ice_rx_buf_adjust_pg_offset(rx_buf, truesize);
     } else {
         /* buffer is unused, reset bias back to rx_buf; data was copied
          * onto skb's linear part so there's no need for adjusting
          * page offset and we can reuse this buffer as-is
          */
         rx_buf->pagecnt_bias++;
     }
 
     return skb;
 }
 
 /**
  * ice_put_rx_buf - Clean up used buffer and either recycle or free
  * @rx_ring: Rx descriptor ring to transact packets on
  * @rx_buf: Rx buffer to pull data from
  * @rx_buf_pgcnt: Rx buffer page count pre xdp_do_redirect()
  *
  * This function will update next_to_clean and then clean up the contents
  * of the rx_buf. It will either recycle the buffer or unmap it and free
  * the associated resources.
  */
 static void
 ice_put_rx_buf(struct ice_rx_ring *rx_ring, struct ice_rx_buf *rx_buf,
            int rx_buf_pgcnt)
 {
     u16 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;
 
     if (!rx_buf)
         return;
 
     if (ice_can_reuse_rx_page(rx_buf, rx_buf_pgcnt)) {
         /* hand second half of page back to the ring */
         ice_reuse_rx_page(rx_ring, rx_buf);
     } else {
         /* we are not reusing the buffer so unmap it */
         dma_unmap_page_attrs(rx_ring->dev, rx_buf->dma,
                      ice_rx_pg_size(rx_ring), DMA_FROM_DEVICE,
                      ICE_RX_DMA_ATTR);
         __page_frag_cache_drain(rx_buf->page, rx_buf->pagecnt_bias);
     }
 
     /* clear contents of buffer_info */
     rx_buf->page = NULL;
 }
 
 /**
  * ice_is_non_eop - process handling of non-EOP buffers
  * @rx_ring: Rx ring being processed
  * @rx_desc: Rx descriptor for current buffer
  *
  * If the buffer is an EOP buffer, this function exits returning false,
  * otherwise return true indicating that this is in fact a non-EOP buffer.
  */
 static bool
 ice_is_non_eop(struct ice_rx_ring *rx_ring, union ice_32b_rx_flex_desc *rx_desc)
 {
     /* if we are the last buffer then there is nothing else to do */
 #define ICE_RXD_EOF BIT(ICE_RX_FLEX_DESC_STATUS0_EOF_S)
     if (likely(ice_test_staterr(rx_desc->wb.status_error0, ICE_RXD_EOF)))
         return false;
 
     rx_ring->rx_stats.non_eop_descs++;
 
     return true;
 }
 
 /**
  * ice_clean_rx_irq - Clean completed descriptors from Rx ring - bounce buf
  * @rx_ring: Rx descriptor ring to transact packets on
  * @budget: Total limit on number of packets to process
  *
  * This function provides a "bounce buffer" approach to Rx interrupt
  * processing. The advantage to this is that on systems that have
  * expensive overhead for IOMMU access this provides a means of avoiding
  * it by maintaining the mapping of the page to the system.
  *
  * Returns amount of work completed
  */
 int ice_clean_rx_irq(struct ice_rx_ring *rx_ring, int budget)
 {
     unsigned int total_rx_bytes = 0, total_rx_pkts = 0, frame_sz = 0;
     u16 cleaned_count = ICE_DESC_UNUSED(rx_ring);
     unsigned int offset = rx_ring->rx_offset;
     struct ice_tx_ring *xdp_ring = NULL;
     unsigned int xdp_res, xdp_xmit = 0;
     struct sk_buff *skb = rx_ring->skb;
     struct bpf_prog *xdp_prog = NULL;
     struct xdp_buff xdp;
     bool failure;
 
     /* Frame size depend on rx_ring setup when PAGE_SIZE=4K */
 #if (PAGE_SIZE < 8192)
     frame_sz = ice_rx_frame_truesize(rx_ring, 0);
 #endif
     xdp_init_buff(&xdp, frame_sz, &rx_ring->xdp_rxq);
 
     xdp_prog = READ_ONCE(rx_ring->xdp_prog);
     if (xdp_prog)
         xdp_ring = rx_ring->xdp_ring;
 
     /* start the loop to process Rx packets bounded by 'budget' */
     while (likely(total_rx_pkts < (unsigned int)budget)) {
         union ice_32b_rx_flex_desc *rx_desc;
         struct ice_rx_buf *rx_buf;
         unsigned char *hard_start;
         unsigned int size;
         u16 stat_err_bits;
         int rx_buf_pgcnt;
         u16 vlan_tag = 0;
         u16 rx_ptype;
 
         /* get the Rx desc from Rx ring based on 'next_to_clean' */
         rx_desc = ICE_RX_DESC(rx_ring, rx_ring->next_to_clean);
 
         /* status_error_len will always be zero for unused descriptors
          * because it's cleared in cleanup, and overlaps with hdr_addr
          * which is always zero because packet split isn't used, if the
          * hardware wrote DD then it will be non-zero
          */
         stat_err_bits = BIT(ICE_RX_FLEX_DESC_STATUS0_DD_S);
         if (!ice_test_staterr(rx_desc->wb.status_error0, stat_err_bits))
             break;
 
         /* This memory barrier is needed to keep us from reading
          * any other fields out of the rx_desc until we know the
          * DD bit is set.
          */
         dma_rmb();
 
         ice_trace(clean_rx_irq, rx_ring, rx_desc);
         if (rx_desc->wb.rxdid == FDIR_DESC_RXDID || !rx_ring->netdev) {
             struct ice_vsi *ctrl_vsi = rx_ring->vsi;
 
             if (rx_desc->wb.rxdid == FDIR_DESC_RXDID &&
                 ctrl_vsi->vf)
                 ice_vc_fdir_irq_handler(ctrl_vsi, rx_desc);
             ice_put_rx_buf(rx_ring, NULL, 0);
             cleaned_count++;
             continue;
         }
 
         size = le16_to_cpu(rx_desc->wb.pkt_len) &
             ICE_RX_FLX_DESC_PKT_LEN_M;
 
         /* retrieve a buffer from the ring */
         rx_buf = ice_get_rx_buf(rx_ring, size, &rx_buf_pgcnt);
 
         if (!size) {
             xdp.data = NULL;
             xdp.data_end = NULL;
             xdp.data_hard_start = NULL;
             xdp.data_meta = NULL;
             goto construct_skb;
         }
 
         hard_start = page_address(rx_buf->page) + rx_buf->page_offset -
                  offset;
         xdp_prepare_buff(&xdp, hard_start, offset, size, true);
 #if (PAGE_SIZE > 4096)
         /* At larger PAGE_SIZE, frame_sz depend on len size */
         xdp.frame_sz = ice_rx_frame_truesize(rx_ring, size);
 #endif
 
         if (!xdp_prog)
             goto construct_skb;
 
         xdp_res = ice_run_xdp(rx_ring, &xdp, xdp_prog, xdp_ring);
         if (!xdp_res)
             goto construct_skb;
         if (xdp_res & (ICE_XDP_TX | ICE_XDP_REDIR)) {
             xdp_xmit |= xdp_res;
             ice_rx_buf_adjust_pg_offset(rx_buf, xdp.frame_sz);
         } else {
             rx_buf->pagecnt_bias++;
         }
         total_rx_bytes += size;
         total_rx_pkts++;
 
         cleaned_count++;
         ice_put_rx_buf(rx_ring, rx_buf, rx_buf_pgcnt);
         continue;
 construct_skb:
         if (skb) {
             ice_add_rx_frag(rx_ring, rx_buf, skb, size);
         } else if (likely(xdp.data)) {
             if (ice_ring_uses_build_skb(rx_ring))
                 skb = ice_build_skb(rx_ring, rx_buf, &xdp);
             else
                 skb = ice_construct_skb(rx_ring, rx_buf, &xdp);
         }
         /* exit if we failed to retrieve a buffer */
         if (!skb) {
             rx_ring->rx_stats.alloc_buf_failed++;
             if (rx_buf)
                 rx_buf->pagecnt_bias++;
             break;
         }
 
         ice_put_rx_buf(rx_ring, rx_buf, rx_buf_pgcnt);
         cleaned_count++;
 
         /* skip if it is NOP desc */
         if (ice_is_non_eop(rx_ring, rx_desc))
             continue;
 
         stat_err_bits = BIT(ICE_RX_FLEX_DESC_STATUS0_RXE_S);
         if (unlikely(ice_test_staterr(rx_desc->wb.status_error0,
                           stat_err_bits))) {
             dev_kfree_skb_any(skb);
             continue;
         }
 
         vlan_tag = ice_get_vlan_tag_from_rx_desc(rx_desc);
 
         /* pad the skb if needed, to make a valid ethernet frame */
         if (eth_skb_pad(skb)) {
             skb = NULL;
             continue;
         }
 
         /* probably a little skewed due to removing CRC */
         total_rx_bytes += skb->len;
 
         /* populate checksum, VLAN, and protocol */
         rx_ptype = le16_to_cpu(rx_desc->wb.ptype_flex_flags0) &
             ICE_RX_FLEX_DESC_PTYPE_M;
 
         ice_process_skb_fields(rx_ring, rx_desc, skb, rx_ptype);
 
         ice_trace(clean_rx_irq_indicate, rx_ring, rx_desc, skb);
         /* send completed skb up the stack */
         ice_receive_skb(rx_ring, skb, vlan_tag);
         skb = NULL;
 
         /* update budget accounting */
         total_rx_pkts++;
     }
 
     /* return up to cleaned_count buffers to hardware */
     failure = ice_alloc_rx_bufs(rx_ring, cleaned_count);
 
     if (xdp_prog)
         ice_finalize_xdp_rx(xdp_ring, xdp_xmit);
     rx_ring->skb = skb;
 
     ice_update_rx_ring_stats(rx_ring, total_rx_pkts, total_rx_bytes);
 
     /* guarantee a trip back through this routine if there was a failure */
     return failure ? budget : (int)total_rx_pkts;
 }
 
 static void __ice_update_sample(struct ice_q_vector *q_vector,
                 struct ice_ring_container *rc,
                 struct dim_sample *sample,
                 bool is_tx)
 {
     u64 packets = 0, bytes = 0;
 
     if (is_tx) {
         struct ice_tx_ring *tx_ring;
 
         ice_for_each_tx_ring(tx_ring, *rc) {
             packets += tx_ring->stats.pkts;
             bytes += tx_ring->stats.bytes;
         }
     } else {
         struct ice_rx_ring *rx_ring;
 
         ice_for_each_rx_ring(rx_ring, *rc) {
             packets += rx_ring->stats.pkts;
             bytes += rx_ring->stats.bytes;
         }
     }
 
     dim_update_sample(q_vector->total_events, packets, bytes, sample);
     sample->comp_ctr = 0;
 
     /* if dim settings get stale, like when not updated for 1
      * second or longer, force it to start again. This addresses the
      * frequent case of an idle queue being switched to by the
      * scheduler. The 1,000 here means 1,000 milliseconds.
      */
     if (ktime_ms_delta(sample->time, rc->dim.start_sample.time) >= 1000)
         rc->dim.state = DIM_START_MEASURE;
 }
 
 /**
  * ice_net_dim - Update net DIM algorithm
  * @q_vector: the vector associated with the interrupt
  *
  * Create a DIM sample and notify net_dim() so that it can possibly decide
  * a new ITR value based on incoming packets, bytes, and interrupts.
  *
  * This function is a no-op if the ring is not configured to dynamic ITR.
  */
 static void ice_net_dim(struct ice_q_vector *q_vector)
 {
     struct ice_ring_container *tx = &q_vector->tx;
     struct ice_ring_container *rx = &q_vector->rx;
 
     if (ITR_IS_DYNAMIC(tx)) {
         struct dim_sample dim_sample;
 
         __ice_update_sample(q_vector, tx, &dim_sample, true);
         net_dim(&tx->dim, dim_sample);
     }
 
     if (ITR_IS_DYNAMIC(rx)) {
         struct dim_sample dim_sample;
 
         __ice_update_sample(q_vector, rx, &dim_sample, false);
         net_dim(&rx->dim, dim_sample);
     }
 }
 
 /**
  * ice_buildreg_itr - build value for writing to the GLINT_DYN_CTL register
  * @itr_idx: interrupt throttling index
  * @itr: interrupt throttling value in usecs
  */
 static u32 ice_buildreg_itr(u16 itr_idx, u16 itr)
 {
     /* The ITR value is reported in microseconds, and the register value is
      * recorded in 2 microsecond units. For this reason we only need to
      * shift by the GLINT_DYN_CTL_INTERVAL_S - ICE_ITR_GRAN_S to apply this
      * granularity as a shift instead of division. The mask makes sure the
      * ITR value is never odd so we don't accidentally write into the field
      * prior to the ITR field.
      */
     itr &= ICE_ITR_MASK;
 
     return GLINT_DYN_CTL_INTENA_M | GLINT_DYN_CTL_CLEARPBA_M |
         (itr_idx << GLINT_DYN_CTL_ITR_INDX_S) |
         (itr << (GLINT_DYN_CTL_INTERVAL_S - ICE_ITR_GRAN_S));
 }
 
 /**
  * ice_enable_interrupt - re-enable MSI-X interrupt
  * @q_vector: the vector associated with the interrupt to enable
  *
  * If the VSI is down, the interrupt will not be re-enabled. Also,
  * when enabling the interrupt always reset the wb_on_itr to false
  * and trigger a software interrupt to clean out internal state.
  */
 static void ice_enable_interrupt(struct ice_q_vector *q_vector)
 {
     struct ice_vsi *vsi = q_vector->vsi;
     bool wb_en = q_vector->wb_on_itr;
     u32 itr_val;
 
     if (test_bit(ICE_DOWN, vsi->state))
         return;
 
     /* trigger an ITR delayed software interrupt when exiting busy poll, to
      * make sure to catch any pending cleanups that might have been missed
      * due to interrupt state transition. If busy poll or poll isn't
      * enabled, then don't update ITR, and just enable the interrupt.
      */
     if (!wb_en) {
         itr_val = ice_buildreg_itr(ICE_ITR_NONE, 0);
     } else {
         q_vector->wb_on_itr = false;
 
         /* do two things here with a single write. Set up the third ITR
          * index to be used for software interrupt moderation, and then
          * trigger a software interrupt with a rate limit of 20K on
          * software interrupts, this will help avoid high interrupt
          * loads due to frequently polling and exiting polling.
          */
         itr_val = ice_buildreg_itr(ICE_IDX_ITR2, ICE_ITR_20K);
         itr_val |= GLINT_DYN_CTL_SWINT_TRIG_M |
                ICE_IDX_ITR2 << GLINT_DYN_CTL_SW_ITR_INDX_S |
                GLINT_DYN_CTL_SW_ITR_INDX_ENA_M;
     }
     wr32(&vsi->back->hw, GLINT_DYN_CTL(q_vector->reg_idx), itr_val);
 }
 
 /**
  * ice_set_wb_on_itr - set WB_ON_ITR for this q_vector
  * @q_vector: q_vector to set WB_ON_ITR on
  *
  * We need to tell hardware to write-back completed descriptors even when
  * interrupts are disabled. Descriptors will be written back on cache line
  * boundaries without WB_ON_ITR enabled, but if we don't enable WB_ON_ITR
  * descriptors may not be written back if they don't fill a cache line until
  * the next interrupt.
  *
  * This sets the write-back frequency to whatever was set previously for the
  * ITR indices. Also, set the INTENA_MSK bit to make sure hardware knows we
  * aren't meddling with the INTENA_M bit.
  */
 static void ice_set_wb_on_itr(struct ice_q_vector *q_vector)
 {
     struct ice_vsi *vsi = q_vector->vsi;
 
     /* already in wb_on_itr mode no need to change it */
     if (q_vector->wb_on_itr)
         return;
 
     /* use previously set ITR values for all of the ITR indices by
      * specifying ICE_ITR_NONE, which will vary in adaptive (AIM) mode and
      * be static in non-adaptive mode (user configured)
      */
     wr32(&vsi->back->hw, GLINT_DYN_CTL(q_vector->reg_idx),
          ((ICE_ITR_NONE << GLINT_DYN_CTL_ITR_INDX_S) &
           GLINT_DYN_CTL_ITR_INDX_M) | GLINT_DYN_CTL_INTENA_MSK_M |
          GLINT_DYN_CTL_WB_ON_ITR_M);
 
     q_vector->wb_on_itr = true;
 }
 
 /**
  * ice_napi_poll - NAPI polling Rx/Tx cleanup routine
  * @napi: napi struct with our devices info in it
  * @budget: amount of work driver is allowed to do this pass, in packets
  *
  * This function will clean all queues associated with a q_vector.
  *
  * Returns the amount of work done
  */
 int ice_napi_poll(struct napi_struct *napi, int budget)
 {
     struct ice_q_vector *q_vector =
                 container_of(napi, struct ice_q_vector, napi);
     struct ice_tx_ring *tx_ring;
     struct ice_rx_ring *rx_ring;
     bool clean_complete = true;
     int budget_per_ring;
     int work_done = 0;
 
     /* Since the actual Tx work is minimal, we can give the Tx a larger
      * budget and be more aggressive about cleaning up the Tx descriptors.
      */
     ice_for_each_tx_ring(tx_ring, q_vector->tx) {
         bool wd;
 
         if (tx_ring->xsk_pool)
             wd = ice_xmit_zc(tx_ring);
         else if (ice_ring_is_xdp(tx_ring))
             wd = true;
         else
             wd = ice_clean_tx_irq(tx_ring, budget);
 
         if (!wd)
             clean_complete = false;
     }
 
     /* Handle case where we are called by netpoll with a budget of 0 */
     if (unlikely(budget <= 0))
         return budget;
 
     /* normally we have 1 Rx ring per q_vector */
     if (unlikely(q_vector->num_ring_rx > 1))
         /* We attempt to distribute budget to each Rx queue fairly, but
          * don't allow the budget to go below 1 because that would exit
          * polling early.
          */
         budget_per_ring = max_t(int, budget / q_vector->num_ring_rx, 1);
     else
         /* Max of 1 Rx ring in this q_vector so give it the budget */
         budget_per_ring = budget;
 
     ice_for_each_rx_ring(rx_ring, q_vector->rx) {
         int cleaned;
 
         /* A dedicated path for zero-copy allows making a single
          * comparison in the irq context instead of many inside the
          * ice_clean_rx_irq function and makes the codebase cleaner.
          */
         cleaned = rx_ring->xsk_pool ?
               ice_clean_rx_irq_zc(rx_ring, budget_per_ring) :
               ice_clean_rx_irq(rx_ring, budget_per_ring);
         work_done += cleaned;
         /* if we clean as many as budgeted, we must not be done */
         if (cleaned >= budget_per_ring)
             clean_complete = false;
     }
 
     /* If work not completed, return budget and polling will return */
     if (!clean_complete) {
         /* Set the writeback on ITR so partial completions of
          * cache-lines will still continue even if we're polling.
          */
         ice_set_wb_on_itr(q_vector);
         return budget;
     }
 
     /* Exit the polling mode, but don't re-enable interrupts if stack might
      * poll us due to busy-polling
      */
     if (napi_complete_done(napi, work_done)) {
         ice_net_dim(q_vector);
         ice_enable_interrupt(q_vector);
     } else {
         ice_set_wb_on_itr(q_vector);
     }
 
     return min_t(int, work_done, budget - 1);
 }
 
 /**
  * __ice_maybe_stop_tx - 2nd level check for Tx stop conditions
  * @tx_ring: the ring to be checked
  * @size: the size buffer we want to assure is available
  *
  * Returns -EBUSY if a stop is needed, else 0
  */
 static int __ice_maybe_stop_tx(struct ice_tx_ring *tx_ring, unsigned int size)
 {
     netif_tx_stop_queue(txring_txq(tx_ring));
     /* Memory barrier before checking head and tail */
     smp_mb();
 
     /* Check again in a case another CPU has just made room available. */
     if (likely(ICE_DESC_UNUSED(tx_ring) < size))
         return -EBUSY;
 
     /* A reprieve! - use start_queue because it doesn't call schedule */
     netif_tx_start_queue(txring_txq(tx_ring));
     ++tx_ring->tx_stats.restart_q;
     return 0;
 }
 
 /**
  * ice_maybe_stop_tx - 1st level check for Tx stop conditions
  * @tx_ring: the ring to be checked
  * @size:    the size buffer we want to assure is available
  *
  * Returns 0 if stop is not needed
  */
 static int ice_maybe_stop_tx(struct ice_tx_ring *tx_ring, unsigned int size)
 {
     if (likely(ICE_DESC_UNUSED(tx_ring) >= size))
         return 0;
 
     return __ice_maybe_stop_tx(tx_ring, size);
 }
 
 /**
  * ice_tx_map - Build the Tx descriptor
  * @tx_ring: ring to send buffer on
  * @first: first buffer info buffer to use
  * @off: pointer to struct that holds offload parameters
  *
  * This function loops over the skb data pointed to by *first
  * and gets a physical address for each memory location and programs
  * it and the length into the transmit descriptor.
  */
 static void
 ice_tx_map(struct ice_tx_ring *tx_ring, struct ice_tx_buf *first,
        struct ice_tx_offload_params *off)
 {
     u64 td_offset, td_tag, td_cmd;
     u16 i = tx_ring->next_to_use;
     unsigned int data_len, size;
     struct ice_tx_desc *tx_desc;
     struct ice_tx_buf *tx_buf;
     struct sk_buff *skb;
     skb_frag_t *frag;
     dma_addr_t dma;
     bool kick;
 
     td_tag = off->td_l2tag1;
     td_cmd = off->td_cmd;
     td_offset = off->td_offset;
     skb = first->skb;
 
     data_len = skb->data_len;
     size = skb_headlen(skb);
 
     tx_desc = ICE_TX_DESC(tx_ring, i);
 
     if (first->tx_flags & ICE_TX_FLAGS_HW_VLAN) {
         td_cmd |= (u64)ICE_TX_DESC_CMD_IL2TAG1;
         td_tag = (first->tx_flags & ICE_TX_FLAGS_VLAN_M) >>
               ICE_TX_FLAGS_VLAN_S;
     }
 
     dma = dma_map_single(tx_ring->dev, skb->data, size, DMA_TO_DEVICE);
 
     tx_buf = first;
 
     for (frag = &skb_shinfo(skb)->frags[0];; frag++) {
         unsigned int max_data = ICE_MAX_DATA_PER_TXD_ALIGNED;
 
         if (dma_mapping_error(tx_ring->dev, dma))
             goto dma_error;
 
         /* record length, and DMA address */
         dma_unmap_len_set(tx_buf, len, size);
         dma_unmap_addr_set(tx_buf, dma, dma);
 
         /* align size to end of page */
         max_data += -dma & (ICE_MAX_READ_REQ_SIZE - 1);
         tx_desc->buf_addr = cpu_to_le64(dma);
 
         /* account for data chunks larger than the hardware
          * can handle
          */
         while (unlikely(size > ICE_MAX_DATA_PER_TXD)) {
             tx_desc->cmd_type_offset_bsz =
                 ice_build_ctob(td_cmd, td_offset, max_data,
                            td_tag);
 
             tx_desc++;
             i++;
 
             if (i == tx_ring->count) {
                 tx_desc = ICE_TX_DESC(tx_ring, 0);
                 i = 0;
             }
 
             dma += max_data;
             size -= max_data;
 
             max_data = ICE_MAX_DATA_PER_TXD_ALIGNED;
             tx_desc->buf_addr = cpu_to_le64(dma);
         }
 
         if (likely(!data_len))
             break;
 
         tx_desc->cmd_type_offset_bsz = ice_build_ctob(td_cmd, td_offset,
                                   size, td_tag);
 
         tx_desc++;
         i++;
 
         if (i == tx_ring->count) {
             tx_desc = ICE_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_buf = &tx_ring->tx_buf[i];
     }
 
     /* record SW timestamp if HW timestamp is not available */
     skb_tx_timestamp(first->skb);
 
     i++;
     if (i == tx_ring->count)
         i = 0;
 
     /* write last descriptor with RS and EOP bits */
     td_cmd |= (u64)ICE_TXD_LAST_DESC_CMD;
     tx_desc->cmd_type_offset_bsz =
             ice_build_ctob(td_cmd, td_offset, size, td_tag);
 
     /* Force memory writes to complete before letting h/w know there
      * are new descriptors to fetch.
      *
      * We also use 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;
 
     ice_maybe_stop_tx(tx_ring, DESC_NEEDED);
 
     /* notify HW of packet */
     kick = __netdev_tx_sent_queue(txring_txq(tx_ring), first->bytecount,
                       netdev_xmit_more());
     if (kick)
         /* notify HW of packet */
         writel(i, tx_ring->tail);
 
     return;
 
 dma_error:
     /* clear DMA mappings for failed tx_buf map */
     for (;;) {
         tx_buf = &tx_ring->tx_buf[i];
         ice_unmap_and_free_tx_buf(tx_ring, tx_buf);
         if (tx_buf == first)
             break;
         if (i == 0)
             i = tx_ring->count;
         i--;
     }
 
     tx_ring->next_to_use = i;
 }
 
 /**
  * ice_tx_csum - Enable Tx checksum offloads
  * @first: pointer to the first descriptor
  * @off: pointer to struct that holds offload parameters
  *
  * Returns 0 or error (negative) if checksum offload can't happen, 1 otherwise.
  */
 static
 int ice_tx_csum(struct ice_tx_buf *first, struct ice_tx_offload_params *off)
 {
     u32 l4_len = 0, l3_len = 0, l2_len = 0;
     struct sk_buff *skb = first->skb;
     union {
         struct iphdr *v4;
         struct ipv6hdr *v6;
         unsigned char *hdr;
     } ip;
     union {
         struct tcphdr *tcp;
         unsigned char *hdr;
     } l4;
     __be16 frag_off, protocol;
     unsigned char *exthdr;
     u32 offset, cmd = 0;
     u8 l4_proto = 0;
 
     if (skb->ip_summed != CHECKSUM_PARTIAL)
         return 0;
 
     protocol = vlan_get_protocol(skb);
 
     if (eth_p_mpls(protocol)) {
         ip.hdr = skb_inner_network_header(skb);
         l4.hdr = skb_checksum_start(skb);
     } else {
         ip.hdr = skb_network_header(skb);
         l4.hdr = skb_transport_header(skb);
     }
 
     /* compute outer L2 header size */
     l2_len = ip.hdr - skb->data;
     offset = (l2_len / 2) << ICE_TX_DESC_LEN_MACLEN_S;
 
     /* set the tx_flags to indicate the IP protocol type. this is
      * required so that checksum header computation below is accurate.
      */
     if (ip.v4->version == 4)
         first->tx_flags |= ICE_TX_FLAGS_IPV4;
     else if (ip.v6->version == 6)
         first->tx_flags |= ICE_TX_FLAGS_IPV6;
 
     if (skb->encapsulation) {
         bool gso_ena = false;
         u32 tunnel = 0;
 
         /* define outer network header type */
         if (first->tx_flags & ICE_TX_FLAGS_IPV4) {
             tunnel |= (first->tx_flags & ICE_TX_FLAGS_TSO) ?
                   ICE_TX_CTX_EIPT_IPV4 :
                   ICE_TX_CTX_EIPT_IPV4_NO_CSUM;
             l4_proto = ip.v4->protocol;
         } else if (first->tx_flags & ICE_TX_FLAGS_IPV6) {
             int ret;
 
             tunnel |= ICE_TX_CTX_EIPT_IPV6;
             exthdr = ip.hdr + sizeof(*ip.v6);
             l4_proto = ip.v6->nexthdr;
             ret = ipv6_skip_exthdr(skb, exthdr - skb->data,
                            &l4_proto, &frag_off);
             if (ret < 0)
                 return -1;
         }
 
         /* define outer transport */
         switch (l4_proto) {
         case IPPROTO_UDP:
             tunnel |= ICE_TXD_CTX_UDP_TUNNELING;
             first->tx_flags |= ICE_TX_FLAGS_TUNNEL;
             break;
         case IPPROTO_GRE:
             tunnel |= ICE_TXD_CTX_GRE_TUNNELING;
             first->tx_flags |= ICE_TX_FLAGS_TUNNEL;
             break;
         case IPPROTO_IPIP:
         case IPPROTO_IPV6:
             first->tx_flags |= ICE_TX_FLAGS_TUNNEL;
             l4.hdr = skb_inner_network_header(skb);
             break;
         default:
             if (first->tx_flags & ICE_TX_FLAGS_TSO)
                 return -1;
 
             skb_checksum_help(skb);
             return 0;
         }
 
         /* compute outer L3 header size */
         tunnel |= ((l4.hdr - ip.hdr) / 4) <<
               ICE_TXD_CTX_QW0_EIPLEN_S;
 
         /* switch IP header pointer from outer to inner header */
         ip.hdr = skb_inner_network_header(skb);
 
         /* compute tunnel header size */
         tunnel |= ((ip.hdr - l4.hdr) / 2) <<
                ICE_TXD_CTX_QW0_NATLEN_S;
 
         gso_ena = skb_shinfo(skb)->gso_type & SKB_GSO_PARTIAL;
         /* indicate if we need to offload outer UDP header */
         if ((first->tx_flags & ICE_TX_FLAGS_TSO) && !gso_ena &&
             (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL_CSUM))
             tunnel |= ICE_TXD_CTX_QW0_L4T_CS_M;
 
         /* record tunnel offload values */
         off->cd_tunnel_params |= tunnel;
 
         /* set DTYP=1 to indicate that it's an Tx context descriptor
          * in IPsec tunnel mode with Tx offloads in Quad word 1
          */
         off->cd_qw1 |= (u64)ICE_TX_DESC_DTYPE_CTX;
 
         /* switch L4 header pointer from outer to inner */
         l4.hdr = skb_inner_transport_header(skb);
         l4_proto = 0;
 
         /* reset type as we transition from outer to inner headers */
         first->tx_flags &= ~(ICE_TX_FLAGS_IPV4 | ICE_TX_FLAGS_IPV6);
         if (ip.v4->version == 4)
             first->tx_flags |= ICE_TX_FLAGS_IPV4;
         if (ip.v6->version == 6)
             first->tx_flags |= ICE_TX_FLAGS_IPV6;
     }
 
     /* Enable IP checksum offloads */
     if (first->tx_flags & ICE_TX_FLAGS_IPV4) {
         l4_proto = ip.v4->protocol;
         /* the stack computes the IP header already, the only time we
          * need the hardware to recompute it is in the case of TSO.
          */
         if (first->tx_flags & ICE_TX_FLAGS_TSO)
             cmd |= ICE_TX_DESC_CMD_IIPT_IPV4_CSUM;
         else
             cmd |= ICE_TX_DESC_CMD_IIPT_IPV4;
 
     } else if (first->tx_flags & ICE_TX_FLAGS_IPV6) {
         cmd |= ICE_TX_DESC_CMD_IIPT_IPV6;
         exthdr = ip.hdr + sizeof(*ip.v6);
         l4_proto = ip.v6->nexthdr;
         if (l4.hdr != exthdr)
             ipv6_skip_exthdr(skb, exthdr - skb->data, &l4_proto,
                      &frag_off);
     } else {
         return -1;
     }
 
     /* compute inner L3 header size */
     l3_len = l4.hdr - ip.hdr;
     offset |= (l3_len / 4) << ICE_TX_DESC_LEN_IPLEN_S;
 
     /* Enable L4 checksum offloads */
     switch (l4_proto) {
     case IPPROTO_TCP:
         /* enable checksum offloads */
         cmd |= ICE_TX_DESC_CMD_L4T_EOFT_TCP;
         l4_len = l4.tcp->doff;
         offset |= l4_len << ICE_TX_DESC_LEN_L4_LEN_S;
         break;
     case IPPROTO_UDP:
         /* enable UDP checksum offload */
         cmd |= ICE_TX_DESC_CMD_L4T_EOFT_UDP;
         l4_len = (sizeof(struct udphdr) >> 2);
         offset |= l4_len << ICE_TX_DESC_LEN_L4_LEN_S;
         break;
     case IPPROTO_SCTP:
         /* enable SCTP checksum offload */
         cmd |= ICE_TX_DESC_CMD_L4T_EOFT_SCTP;
         l4_len = sizeof(struct sctphdr) >> 2;
         offset |= l4_len << ICE_TX_DESC_LEN_L4_LEN_S;
         break;
 
     default:
         if (first->tx_flags & ICE_TX_FLAGS_TSO)
             return -1;
         skb_checksum_help(skb);
         return 0;
     }
 
     off->td_cmd |= cmd;
     off->td_offset |= offset;
     return 1;
 }
 
 /**
  * ice_tx_prepare_vlan_flags - prepare generic Tx VLAN tagging flags for HW
  * @tx_ring: ring to send buffer on
  * @first: pointer to struct ice_tx_buf
  *
  * Checks the skb and set up correspondingly several generic transmit flags
  * related to VLAN tagging for the HW, such as VLAN, DCB, etc.
  */
 static void
 ice_tx_prepare_vlan_flags(struct ice_tx_ring *tx_ring, struct ice_tx_buf *first)
 {
     struct sk_buff *skb = first->skb;
 
     /* nothing left to do, software offloaded VLAN */
     if (!skb_vlan_tag_present(skb) && eth_type_vlan(skb->protocol))
         return;
 
     /* the VLAN ethertype/tpid is determined by VSI configuration and netdev
      * feature flags, which the driver only allows either 802.1Q or 802.1ad
      * VLAN offloads exclusively so we only care about the VLAN ID here
      */
     if (skb_vlan_tag_present(skb)) {
         first->tx_flags |= skb_vlan_tag_get(skb) << ICE_TX_FLAGS_VLAN_S;
         if (tx_ring->flags & ICE_TX_FLAGS_RING_VLAN_L2TAG2)
             first->tx_flags |= ICE_TX_FLAGS_HW_OUTER_SINGLE_VLAN;
         else
             first->tx_flags |= ICE_TX_FLAGS_HW_VLAN;
     }
 
     ice_tx_prepare_vlan_flags_dcb(tx_ring, first);
 }
 
 /**
  * ice_tso - computes mss and TSO length to prepare for TSO
  * @first: pointer to struct ice_tx_buf
  * @off: pointer to struct that holds offload parameters
  *
  * Returns 0 or error (negative) if TSO can't happen, 1 otherwise.
  */
 static
 int ice_tso(struct ice_tx_buf *first, struct ice_tx_offload_params *off)
 {
     struct sk_buff *skb = first->skb;
     union {
         struct iphdr *v4;
         struct ipv6hdr *v6;
         unsigned char *hdr;
     } ip;
     union {
         struct tcphdr *tcp;
         struct udphdr *udp;
         unsigned char *hdr;
     } l4;
     u64 cd_mss, cd_tso_len;
     __be16 protocol;
     u32 paylen;
     u8 l4_start;
     int err;
 
     if (skb->ip_summed != CHECKSUM_PARTIAL)
         return 0;
 
     if (!skb_is_gso(skb))
         return 0;
 
     err = skb_cow_head(skb, 0);
     if (err < 0)
         return err;
 
     /* cppcheck-suppress unreadVariable */
     protocol = vlan_get_protocol(skb);
 
     if (eth_p_mpls(protocol))
         ip.hdr = skb_inner_network_header(skb);
     else
         ip.hdr = skb_network_header(skb);
     l4.hdr = skb_checksum_start(skb);
 
     /* initialize outer IP header fields */
     if (ip.v4->version == 4) {
         ip.v4->tot_len = 0;
         ip.v4->check = 0;
     } else {
         ip.v6->payload_len = 0;
     }
 
     if (skb_shinfo(skb)->gso_type & (SKB_GSO_GRE |
                      SKB_GSO_GRE_CSUM |
                      SKB_GSO_IPXIP4 |
                      SKB_GSO_IPXIP6 |
                      SKB_GSO_UDP_TUNNEL |
                      SKB_GSO_UDP_TUNNEL_CSUM)) {
         if (!(skb_shinfo(skb)->gso_type & SKB_GSO_PARTIAL) &&
             (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL_CSUM)) {
             l4.udp->len = 0;
 
             /* determine offset of outer transport header */
             l4_start = (u8)(l4.hdr - skb->data);
 
             /* remove payload length from outer checksum */
             paylen = skb->len - l4_start;
             csum_replace_by_diff(&l4.udp->check,
                          (__force __wsum)htonl(paylen));
         }
 
         /* reset pointers to inner headers */
 
         /* cppcheck-suppress unreadVariable */
         ip.hdr = skb_inner_network_header(skb);
         l4.hdr = skb_inner_transport_header(skb);
 
         /* initialize inner IP header fields */
         if (ip.v4->version == 4) {
             ip.v4->tot_len = 0;
             ip.v4->check = 0;
         } else {
             ip.v6->payload_len = 0;
         }
     }
 
     /* determine offset of transport header */
     l4_start = (u8)(l4.hdr - skb->data);
 
     /* remove payload length from checksum */
     paylen = skb->len - l4_start;
 
     if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4) {
         csum_replace_by_diff(&l4.udp->check,
                      (__force __wsum)htonl(paylen));
         /* compute length of UDP segmentation header */
         off->header_len = (u8)sizeof(l4.udp) + l4_start;
     } else {
         csum_replace_by_diff(&l4.tcp->check,
                      (__force __wsum)htonl(paylen));
         /* compute length of TCP segmentation header */
         off->header_len = (u8)((l4.tcp->doff * 4) + l4_start);
     }
 
     /* update gso_segs and bytecount */
     first->gso_segs = skb_shinfo(skb)->gso_segs;
     first->bytecount += (first->gso_segs - 1) * off->header_len;
 
     cd_tso_len = skb->len - off->header_len;
     cd_mss = skb_shinfo(skb)->gso_size;
 
     /* record cdesc_qw1 with TSO parameters */
     off->cd_qw1 |= (u64)(ICE_TX_DESC_DTYPE_CTX |
                  (ICE_TX_CTX_DESC_TSO << ICE_TXD_CTX_QW1_CMD_S) |
                  (cd_tso_len << ICE_TXD_CTX_QW1_TSO_LEN_S) |
                  (cd_mss << ICE_TXD_CTX_QW1_MSS_S));
     first->tx_flags |= ICE_TX_FLAGS_TSO;
     return 1;
 }
 
 /**
  * ice_txd_use_count  - estimate the number of descriptors needed for Tx
  * @size: transmit request size in bytes
  *
  * Due to hardware alignment restrictions (4K alignment), we need to
  * assume that we can have no more than 12K of data per descriptor, even
  * though each descriptor can take up to 16K - 1 bytes of aligned memory.
  * Thus, we need to divide by 12K. But division is slow! Instead,
  * we decompose the operation into shifts and one relatively cheap
  * multiply operation.
  *
  * To divide by 12K, we first divide by 4K, then divide by 3:
  *     To divide by 4K, shift right by 12 bits
  *     To divide by 3, multiply by 85, then divide by 256
  *     (Divide by 256 is done by shifting right by 8 bits)
  * Finally, we add one to round up. Because 256 isn't an exact multiple of
  * 3, we'll underestimate near each multiple of 12K. This is actually more
  * accurate as we have 4K - 1 of wiggle room that we can fit into the last
  * segment. For our purposes this is accurate out to 1M which is orders of
  * magnitude greater than our largest possible GSO size.
  *
  * This would then be implemented as:
  *     return (((size >> 12) * 85) >> 8) + ICE_DESCS_FOR_SKB_DATA_PTR;
  *
  * Since multiplication and division are commutative, we can reorder
  * operations into:
  *     return ((size * 85) >> 20) + ICE_DESCS_FOR_SKB_DATA_PTR;
  */
 static unsigned int ice_txd_use_count(unsigned int size)
 {
     return ((size * 85) >> 20) + ICE_DESCS_FOR_SKB_DATA_PTR;
 }
 
 /**
  * ice_xmit_desc_count - calculate number of Tx descriptors needed
  * @skb: send buffer
  *
  * Returns number of data descriptors needed for this skb.
  */
 static unsigned int ice_xmit_desc_count(struct sk_buff *skb)
 {
     const skb_frag_t *frag = &skb_shinfo(skb)->frags[0];
     unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
     unsigned int count = 0, size = skb_headlen(skb);
 
     for (;;) {
         count += ice_txd_use_count(size);
 
         if (!nr_frags--)
             break;
 
         size = skb_frag_size(frag++);
     }
 
     return count;
 }
 
 /**
  * __ice_chk_linearize - Check if there are more than 8 buffers per packet
  * @skb: send buffer
  *
  * Note: This HW can't DMA more than 8 buffers to build a packet on the wire
  * and so we need to figure out the cases where we need to linearize the skb.
  *
  * For TSO we need to count the TSO header and segment payload separately.
  * As such we need to check cases where we have 7 fragments or more as we
  * can potentially require 9 DMA transactions, 1 for the TSO header, 1 for
  * the segment payload in the first descriptor, and another 7 for the
  * fragments.
  */
 static bool __ice_chk_linearize(struct sk_buff *skb)
 {
     const skb_frag_t *frag, *stale;
     int nr_frags, sum;
 
     /* no need to check if number of frags is less than 7 */
     nr_frags = skb_shinfo(skb)->nr_frags;
     if (nr_frags < (ICE_MAX_BUF_TXD - 1))
         return false;
 
     /* We need to walk through the list and validate that each group
      * of 6 fragments totals at least gso_size.
      */
     nr_frags -= ICE_MAX_BUF_TXD - 2;
     frag = &skb_shinfo(skb)->frags[0];
 
     /* Initialize size to the negative value of gso_size minus 1. We
      * use this as the worst case scenario in which the frag ahead
      * of us only provides one byte which is why we are limited to 6
      * descriptors for a single transmit as the header and previous
      * fragment are already consuming 2 descriptors.
      */
     sum = 1 - skb_shinfo(skb)->gso_size;
 
     /* Add size of frags 0 through 4 to create our initial sum */
     sum += skb_frag_size(frag++);
     sum += skb_frag_size(frag++);
     sum += skb_frag_size(frag++);
     sum += skb_frag_size(frag++);
     sum += skb_frag_size(frag++);
 
     /* Walk through fragments adding latest fragment, testing it, and
      * then removing stale fragments from the sum.
      */
     for (stale = &skb_shinfo(skb)->frags[0];; stale++) {
         int stale_size = skb_frag_size(stale);
 
         sum += skb_frag_size(frag++);
 
         /* The stale fragment may present us with a smaller
          * descriptor than the actual fragment size. To account
          * for that we need to remove all the data on the front and
          * figure out what the remainder would be in the last
          * descriptor associated with the fragment.
          */
         if (stale_size > ICE_MAX_DATA_PER_TXD) {
             int align_pad = -(skb_frag_off(stale)) &
                     (ICE_MAX_READ_REQ_SIZE - 1);
 
             sum -= align_pad;
             stale_size -= align_pad;
 
             do {
                 sum -= ICE_MAX_DATA_PER_TXD_ALIGNED;
                 stale_size -= ICE_MAX_DATA_PER_TXD_ALIGNED;
             } while (stale_size > ICE_MAX_DATA_PER_TXD);
         }
 
         /* if sum is negative we failed to make sufficient progress */
         if (sum < 0)
             return true;
 
         if (!nr_frags--)
             break;
 
         sum -= stale_size;
     }
 
     return false;
 }
 
 /**
  * ice_chk_linearize - Check if there are more than 8 fragments per packet
  * @skb:      send buffer
  * @count:    number of buffers used
  *
  * Note: Our HW can't scatter-gather more than 8 fragments to build
  * a packet on the wire and so we need to figure out the cases where we
  * need to linearize the skb.
  */
 static bool ice_chk_linearize(struct sk_buff *skb, unsigned int count)
 {
     /* Both TSO and single send will work if count is less than 8 */
     if (likely(count < ICE_MAX_BUF_TXD))
         return false;
 
     if (skb_is_gso(skb))
         return __ice_chk_linearize(skb);
 
     /* we can support up to 8 data buffers for a single send */
     return count != ICE_MAX_BUF_TXD;
 }
 
 /**
  * ice_tstamp - set up context descriptor for hardware timestamp
  * @tx_ring: pointer to the Tx ring to send buffer on
  * @skb: pointer to the SKB we're sending
  * @first: Tx buffer
  * @off: Tx offload parameters
  */
 static void
 ice_tstamp(struct ice_tx_ring *tx_ring, struct sk_buff *skb,
        struct ice_tx_buf *first, struct ice_tx_offload_params *off)
 {
     s8 idx;
 
     /* only timestamp the outbound packet if the user has requested it */
     if (likely(!(skb_shinfo(skb)->tx_flags & SKBTX_HW_TSTAMP)))
         return;
 
     if (!tx_ring->ptp_tx)
         return;
 
     /* Tx timestamps cannot be sampled when doing TSO */
     if (first->tx_flags & ICE_TX_FLAGS_TSO)
         return;
 
     /* Grab an open timestamp slot */
     idx = ice_ptp_request_ts(tx_ring->tx_tstamps, skb);
     if (idx < 0)
         return;
 
     off->cd_qw1 |= (u64)(ICE_TX_DESC_DTYPE_CTX |
                  (ICE_TX_CTX_DESC_TSYN << ICE_TXD_CTX_QW1_CMD_S) |
                  ((u64)idx << ICE_TXD_CTX_QW1_TSO_LEN_S));
     first->tx_flags |= ICE_TX_FLAGS_TSYN;
 }
 
 /**
  * ice_xmit_frame_ring - Sends buffer on Tx ring
  * @skb: send buffer
  * @tx_ring: ring to send buffer on
  *
  * Returns NETDEV_TX_OK if sent, else an error code
  */
 static netdev_tx_t
 ice_xmit_frame_ring(struct sk_buff *skb, struct ice_tx_ring *tx_ring)
 {
     struct ice_tx_offload_params offload = { 0 };
     struct ice_vsi *vsi = tx_ring->vsi;
     struct ice_tx_buf *first;
     struct ethhdr *eth;
     unsigned int count;
     int tso, csum;
 
     ice_trace(xmit_frame_ring, tx_ring, skb);
 
     count = ice_xmit_desc_count(skb);
     if (ice_chk_linearize(skb, count)) {
         if (__skb_linearize(skb))
             goto out_drop;
         count = ice_txd_use_count(skb->len);
         tx_ring->tx_stats.tx_linearize++;
     }
 
     /* need: 1 descriptor per page * PAGE_SIZE/ICE_MAX_DATA_PER_TXD,
      *       + 1 desc for skb_head_len/ICE_MAX_DATA_PER_TXD,
      *       + 4 desc gap to avoid the cache line where head is,
      *       + 1 desc for context descriptor,
      * otherwise try next time
      */
     if (ice_maybe_stop_tx(tx_ring, count + ICE_DESCS_PER_CACHE_LINE +
                   ICE_DESCS_FOR_CTX_DESC)) {
         tx_ring->tx_stats.tx_busy++;
         return NETDEV_TX_BUSY;
     }
 
     /* prefetch for bql data which is infrequently used */
     netdev_txq_bql_enqueue_prefetchw(txring_txq(tx_ring));
 
     offload.tx_ring = tx_ring;
 
     /* record the location of the first descriptor for this packet */
     first = &tx_ring->tx_buf[tx_ring->next_to_use];
     first->skb = skb;
     first->bytecount = max_t(unsigned int, skb->len, ETH_ZLEN);
     first->gso_segs = 1;
     first->tx_flags = 0;
 
     /* prepare the VLAN tagging flags for Tx */
     ice_tx_prepare_vlan_flags(tx_ring, first);
     if (first->tx_flags & ICE_TX_FLAGS_HW_OUTER_SINGLE_VLAN) {
         offload.cd_qw1 |= (u64)(ICE_TX_DESC_DTYPE_CTX |
                     (ICE_TX_CTX_DESC_IL2TAG2 <<
                     ICE_TXD_CTX_QW1_CMD_S));
         offload.cd_l2tag2 = (first->tx_flags & ICE_TX_FLAGS_VLAN_M) >>
             ICE_TX_FLAGS_VLAN_S;
     }
 
     /* set up TSO offload */
     tso = ice_tso(first, &offload);
     if (tso < 0)
         goto out_drop;
 
     /* always set up Tx checksum offload */
     csum = ice_tx_csum(first, &offload);
     if (csum < 0)
         goto out_drop;
 
     /* allow CONTROL frames egress from main VSI if FW LLDP disabled */
     eth = (struct ethhdr *)skb_mac_header(skb);
     if (unlikely((skb->priority == TC_PRIO_CONTROL ||
               eth->h_proto == htons(ETH_P_LLDP)) &&
              vsi->type == ICE_VSI_PF &&
              vsi->port_info->qos_cfg.is_sw_lldp))
         offload.cd_qw1 |= (u64)(ICE_TX_DESC_DTYPE_CTX |
                     ICE_TX_CTX_DESC_SWTCH_UPLINK <<
                     ICE_TXD_CTX_QW1_CMD_S);
 
     ice_tstamp(tx_ring, skb, first, &offload);
     if (ice_is_switchdev_running(vsi->back))
         ice_eswitch_set_target_vsi(skb, &offload);
 
     if (offload.cd_qw1 & ICE_TX_DESC_DTYPE_CTX) {
         struct ice_tx_ctx_desc *cdesc;
         u16 i = tx_ring->next_to_use;
 
         /* grab the next descriptor */
         cdesc = ICE_TX_CTX_DESC(tx_ring, i);
         i++;
         tx_ring->next_to_use = (i < tx_ring->count) ? i : 0;
 
         /* setup context descriptor */
         cdesc->tunneling_params = cpu_to_le32(offload.cd_tunnel_params);
         cdesc->l2tag2 = cpu_to_le16(offload.cd_l2tag2);
         cdesc->rsvd = cpu_to_le16(0);
         cdesc->qw1 = cpu_to_le64(offload.cd_qw1);
     }
 
     ice_tx_map(tx_ring, first, &offload);
     return NETDEV_TX_OK;
 
 out_drop:
     ice_trace(xmit_frame_ring_drop, tx_ring, skb);
     dev_kfree_skb_any(skb);
     return NETDEV_TX_OK;
 }
 
 /**
  * ice_start_xmit - Selects the correct VSI and Tx queue to send buffer
  * @skb: send buffer
  * @netdev: network interface device structure
  *
  * Returns NETDEV_TX_OK if sent, else an error code
  */
 netdev_tx_t ice_start_xmit(struct sk_buff *skb, struct net_device *netdev)
 {
     struct ice_netdev_priv *np = netdev_priv(netdev);
     struct ice_vsi *vsi = np->vsi;
     struct ice_tx_ring *tx_ring;
 
     tx_ring = vsi->tx_rings[skb->queue_mapping];
 
     /* hardware can't handle really short frames, hardware padding works
      * beyond this point
      */
     if (skb_put_padto(skb, ICE_MIN_TX_LEN))
         return NETDEV_TX_OK;
 
     return ice_xmit_frame_ring(skb, tx_ring);
 }
 
 /**
  * ice_get_dscp_up - return the UP/TC value for a SKB
  * @dcbcfg: DCB config that contains DSCP to UP/TC mapping
  * @skb: SKB to query for info to determine UP/TC
  *
  * This function is to only be called when the PF is in L3 DSCP PFC mode
  */
 static u8 ice_get_dscp_up(struct ice_dcbx_cfg *dcbcfg, struct sk_buff *skb)
 {
     u8 dscp = 0;
 
     if (skb->protocol == htons(ETH_P_IP))
         dscp = ipv4_get_dsfield(ip_hdr(skb)) >> 2;
     else if (skb->protocol == htons(ETH_P_IPV6))
         dscp = ipv6_get_dsfield(ipv6_hdr(skb)) >> 2;
 
     return dcbcfg->dscp_map[dscp];
 }
 
 u16
 ice_select_queue(struct net_device *netdev, struct sk_buff *skb,
          struct net_device *sb_dev)
 {
     struct ice_pf *pf = ice_netdev_to_pf(netdev);
     struct ice_dcbx_cfg *dcbcfg;
 
     dcbcfg = &pf->hw.port_info->qos_cfg.local_dcbx_cfg;
     if (dcbcfg->pfc_mode == ICE_QOS_MODE_DSCP)
         skb->priority = ice_get_dscp_up(dcbcfg, skb);
 
     return netdev_pick_tx(netdev, skb, sb_dev);
 }
 
 /**
  * ice_clean_ctrl_tx_irq - interrupt handler for flow director Tx queue
  * @tx_ring: tx_ring to clean
  */
 void ice_clean_ctrl_tx_irq(struct ice_tx_ring *tx_ring)
 {
     struct ice_vsi *vsi = tx_ring->vsi;
     s16 i = tx_ring->next_to_clean;
     int budget = ICE_DFLT_IRQ_WORK;
     struct ice_tx_desc *tx_desc;
     struct ice_tx_buf *tx_buf;
 
     tx_buf = &tx_ring->tx_buf[i];
     tx_desc = ICE_TX_DESC(tx_ring, i);
     i -= tx_ring->count;
 
     do {
         struct ice_tx_desc *eop_desc = tx_buf->next_to_watch;
 
         /* if next_to_watch is not set then there is no pending work */
         if (!eop_desc)
             break;
 
         /* prevent any other reads prior to eop_desc */
         smp_rmb();
 
         /* if the descriptor isn't done, no work to do */
         if (!(eop_desc->cmd_type_offset_bsz &
               cpu_to_le64(ICE_TX_DESC_DTYPE_DESC_DONE)))
             break;
 
         /* clear next_to_watch to prevent false hangs */
         tx_buf->next_to_watch = NULL;
         tx_desc->buf_addr = 0;
         tx_desc->cmd_type_offset_bsz = 0;
 
         /* move past filter desc */
         tx_buf++;
         tx_desc++;
         i++;
         if (unlikely(!i)) {
             i -= tx_ring->count;
             tx_buf = tx_ring->tx_buf;
             tx_desc = ICE_TX_DESC(tx_ring, 0);
         }
 
         /* unmap the data header */
         if (dma_unmap_len(tx_buf, len))
             dma_unmap_single(tx_ring->dev,
                      dma_unmap_addr(tx_buf, dma),
                      dma_unmap_len(tx_buf, len),
                      DMA_TO_DEVICE);
         if (tx_buf->tx_flags & ICE_TX_FLAGS_DUMMY_PKT)
             devm_kfree(tx_ring->dev, tx_buf->raw_buf);
 
         /* clear next_to_watch to prevent false hangs */
         tx_buf->raw_buf = NULL;
         tx_buf->tx_flags = 0;
         tx_buf->next_to_watch = NULL;
         dma_unmap_len_set(tx_buf, len, 0);
         tx_desc->buf_addr = 0;
         tx_desc->cmd_type_offset_bsz = 0;
 
         /* move past eop_desc for start of next FD desc */
         tx_buf++;
         tx_desc++;
         i++;
         if (unlikely(!i)) {
             i -= tx_ring->count;
             tx_buf = tx_ring->tx_buf;
             tx_desc = ICE_TX_DESC(tx_ring, 0);
         }
 
         budget--;
     } while (likely(budget));
 
     i += tx_ring->count;
     tx_ring->next_to_clean = i;
 
     /* re-enable interrupt if needed */
     ice_irq_dynamic_ena(&vsi->back->hw, vsi, vsi->q_vectors[0]);
 }

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