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path: root/drivers/net/ethernet/intel/ice/ice_xsk.c
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Diffstat (limited to 'drivers/net/ethernet/intel/ice/ice_xsk.c')
-rw-r--r--drivers/net/ethernet/intel/ice/ice_xsk.c1073
1 files changed, 1073 insertions, 0 deletions
diff --git a/drivers/net/ethernet/intel/ice/ice_xsk.c b/drivers/net/ethernet/intel/ice/ice_xsk.c
new file mode 100644
index 000000000..41ee081eb
--- /dev/null
+++ b/drivers/net/ethernet/intel/ice/ice_xsk.c
@@ -0,0 +1,1073 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2019, Intel Corporation. */
+
+#include <linux/bpf_trace.h>
+#include <net/xdp_sock_drv.h>
+#include <net/xdp.h>
+#include "ice.h"
+#include "ice_base.h"
+#include "ice_type.h"
+#include "ice_xsk.h"
+#include "ice_txrx.h"
+#include "ice_txrx_lib.h"
+#include "ice_lib.h"
+
+static struct xdp_buff **ice_xdp_buf(struct ice_rx_ring *rx_ring, u32 idx)
+{
+ return &rx_ring->xdp_buf[idx];
+}
+
+/**
+ * ice_qp_reset_stats - Resets all stats for rings of given index
+ * @vsi: VSI that contains rings of interest
+ * @q_idx: ring index in array
+ */
+static void ice_qp_reset_stats(struct ice_vsi *vsi, u16 q_idx)
+{
+ memset(&vsi->rx_rings[q_idx]->rx_stats, 0,
+ sizeof(vsi->rx_rings[q_idx]->rx_stats));
+ memset(&vsi->tx_rings[q_idx]->stats, 0,
+ sizeof(vsi->tx_rings[q_idx]->stats));
+ if (ice_is_xdp_ena_vsi(vsi))
+ memset(&vsi->xdp_rings[q_idx]->stats, 0,
+ sizeof(vsi->xdp_rings[q_idx]->stats));
+}
+
+/**
+ * ice_qp_clean_rings - Cleans all the rings of a given index
+ * @vsi: VSI that contains rings of interest
+ * @q_idx: ring index in array
+ */
+static void ice_qp_clean_rings(struct ice_vsi *vsi, u16 q_idx)
+{
+ ice_clean_tx_ring(vsi->tx_rings[q_idx]);
+ if (ice_is_xdp_ena_vsi(vsi)) {
+ synchronize_rcu();
+ ice_clean_tx_ring(vsi->xdp_rings[q_idx]);
+ }
+ ice_clean_rx_ring(vsi->rx_rings[q_idx]);
+}
+
+/**
+ * ice_qvec_toggle_napi - Enables/disables NAPI for a given q_vector
+ * @vsi: VSI that has netdev
+ * @q_vector: q_vector that has NAPI context
+ * @enable: true for enable, false for disable
+ */
+static void
+ice_qvec_toggle_napi(struct ice_vsi *vsi, struct ice_q_vector *q_vector,
+ bool enable)
+{
+ if (!vsi->netdev || !q_vector)
+ return;
+
+ if (enable)
+ napi_enable(&q_vector->napi);
+ else
+ napi_disable(&q_vector->napi);
+}
+
+/**
+ * ice_qvec_dis_irq - Mask off queue interrupt generation on given ring
+ * @vsi: the VSI that contains queue vector being un-configured
+ * @rx_ring: Rx ring that will have its IRQ disabled
+ * @q_vector: queue vector
+ */
+static void
+ice_qvec_dis_irq(struct ice_vsi *vsi, struct ice_rx_ring *rx_ring,
+ struct ice_q_vector *q_vector)
+{
+ struct ice_pf *pf = vsi->back;
+ struct ice_hw *hw = &pf->hw;
+ int base = vsi->base_vector;
+ u16 reg;
+ u32 val;
+
+ /* QINT_TQCTL is being cleared in ice_vsi_stop_tx_ring, so handle
+ * here only QINT_RQCTL
+ */
+ reg = rx_ring->reg_idx;
+ val = rd32(hw, QINT_RQCTL(reg));
+ val &= ~QINT_RQCTL_CAUSE_ENA_M;
+ wr32(hw, QINT_RQCTL(reg), val);
+
+ if (q_vector) {
+ u16 v_idx = q_vector->v_idx;
+
+ wr32(hw, GLINT_DYN_CTL(q_vector->reg_idx), 0);
+ ice_flush(hw);
+ synchronize_irq(pf->msix_entries[v_idx + base].vector);
+ }
+}
+
+/**
+ * ice_qvec_cfg_msix - Enable IRQ for given queue vector
+ * @vsi: the VSI that contains queue vector
+ * @q_vector: queue vector
+ */
+static void
+ice_qvec_cfg_msix(struct ice_vsi *vsi, struct ice_q_vector *q_vector)
+{
+ u16 reg_idx = q_vector->reg_idx;
+ struct ice_pf *pf = vsi->back;
+ struct ice_hw *hw = &pf->hw;
+ struct ice_tx_ring *tx_ring;
+ struct ice_rx_ring *rx_ring;
+
+ ice_cfg_itr(hw, q_vector);
+
+ ice_for_each_tx_ring(tx_ring, q_vector->tx)
+ ice_cfg_txq_interrupt(vsi, tx_ring->reg_idx, reg_idx,
+ q_vector->tx.itr_idx);
+
+ ice_for_each_rx_ring(rx_ring, q_vector->rx)
+ ice_cfg_rxq_interrupt(vsi, rx_ring->reg_idx, reg_idx,
+ q_vector->rx.itr_idx);
+
+ ice_flush(hw);
+}
+
+/**
+ * ice_qvec_ena_irq - Enable IRQ for given queue vector
+ * @vsi: the VSI that contains queue vector
+ * @q_vector: queue vector
+ */
+static void ice_qvec_ena_irq(struct ice_vsi *vsi, struct ice_q_vector *q_vector)
+{
+ struct ice_pf *pf = vsi->back;
+ struct ice_hw *hw = &pf->hw;
+
+ ice_irq_dynamic_ena(hw, vsi, q_vector);
+
+ ice_flush(hw);
+}
+
+/**
+ * ice_qp_dis - Disables a queue pair
+ * @vsi: VSI of interest
+ * @q_idx: ring index in array
+ *
+ * Returns 0 on success, negative on failure.
+ */
+static int ice_qp_dis(struct ice_vsi *vsi, u16 q_idx)
+{
+ struct ice_txq_meta txq_meta = { };
+ struct ice_q_vector *q_vector;
+ struct ice_tx_ring *tx_ring;
+ struct ice_rx_ring *rx_ring;
+ int timeout = 50;
+ int err;
+
+ if (q_idx >= vsi->num_rxq || q_idx >= vsi->num_txq)
+ return -EINVAL;
+
+ tx_ring = vsi->tx_rings[q_idx];
+ rx_ring = vsi->rx_rings[q_idx];
+ q_vector = rx_ring->q_vector;
+
+ while (test_and_set_bit(ICE_CFG_BUSY, vsi->state)) {
+ timeout--;
+ if (!timeout)
+ return -EBUSY;
+ usleep_range(1000, 2000);
+ }
+ netif_tx_stop_queue(netdev_get_tx_queue(vsi->netdev, q_idx));
+
+ ice_fill_txq_meta(vsi, tx_ring, &txq_meta);
+ err = ice_vsi_stop_tx_ring(vsi, ICE_NO_RESET, 0, tx_ring, &txq_meta);
+ if (err)
+ return err;
+ if (ice_is_xdp_ena_vsi(vsi)) {
+ struct ice_tx_ring *xdp_ring = vsi->xdp_rings[q_idx];
+
+ memset(&txq_meta, 0, sizeof(txq_meta));
+ ice_fill_txq_meta(vsi, xdp_ring, &txq_meta);
+ err = ice_vsi_stop_tx_ring(vsi, ICE_NO_RESET, 0, xdp_ring,
+ &txq_meta);
+ if (err)
+ return err;
+ }
+ ice_qvec_dis_irq(vsi, rx_ring, q_vector);
+
+ err = ice_vsi_ctrl_one_rx_ring(vsi, false, q_idx, true);
+ if (err)
+ return err;
+
+ ice_qvec_toggle_napi(vsi, q_vector, false);
+ ice_qp_clean_rings(vsi, q_idx);
+ ice_qp_reset_stats(vsi, q_idx);
+
+ return 0;
+}
+
+/**
+ * ice_qp_ena - Enables a queue pair
+ * @vsi: VSI of interest
+ * @q_idx: ring index in array
+ *
+ * Returns 0 on success, negative on failure.
+ */
+static int ice_qp_ena(struct ice_vsi *vsi, u16 q_idx)
+{
+ struct ice_aqc_add_tx_qgrp *qg_buf;
+ struct ice_q_vector *q_vector;
+ struct ice_tx_ring *tx_ring;
+ struct ice_rx_ring *rx_ring;
+ u16 size;
+ int err;
+
+ if (q_idx >= vsi->num_rxq || q_idx >= vsi->num_txq)
+ return -EINVAL;
+
+ size = struct_size(qg_buf, txqs, 1);
+ qg_buf = kzalloc(size, GFP_KERNEL);
+ if (!qg_buf)
+ return -ENOMEM;
+
+ qg_buf->num_txqs = 1;
+
+ tx_ring = vsi->tx_rings[q_idx];
+ rx_ring = vsi->rx_rings[q_idx];
+ q_vector = rx_ring->q_vector;
+
+ err = ice_vsi_cfg_txq(vsi, tx_ring, qg_buf);
+ if (err)
+ goto free_buf;
+
+ if (ice_is_xdp_ena_vsi(vsi)) {
+ struct ice_tx_ring *xdp_ring = vsi->xdp_rings[q_idx];
+
+ memset(qg_buf, 0, size);
+ qg_buf->num_txqs = 1;
+ err = ice_vsi_cfg_txq(vsi, xdp_ring, qg_buf);
+ if (err)
+ goto free_buf;
+ ice_set_ring_xdp(xdp_ring);
+ ice_tx_xsk_pool(vsi, q_idx);
+ }
+
+ err = ice_vsi_cfg_rxq(rx_ring);
+ if (err)
+ goto free_buf;
+
+ ice_qvec_cfg_msix(vsi, q_vector);
+
+ err = ice_vsi_ctrl_one_rx_ring(vsi, true, q_idx, true);
+ if (err)
+ goto free_buf;
+
+ clear_bit(ICE_CFG_BUSY, vsi->state);
+ ice_qvec_toggle_napi(vsi, q_vector, true);
+ ice_qvec_ena_irq(vsi, q_vector);
+
+ netif_tx_start_queue(netdev_get_tx_queue(vsi->netdev, q_idx));
+free_buf:
+ kfree(qg_buf);
+ return err;
+}
+
+/**
+ * ice_xsk_pool_disable - disable a buffer pool region
+ * @vsi: Current VSI
+ * @qid: queue ID
+ *
+ * Returns 0 on success, negative on failure
+ */
+static int ice_xsk_pool_disable(struct ice_vsi *vsi, u16 qid)
+{
+ struct xsk_buff_pool *pool = xsk_get_pool_from_qid(vsi->netdev, qid);
+
+ if (!pool)
+ return -EINVAL;
+
+ clear_bit(qid, vsi->af_xdp_zc_qps);
+ xsk_pool_dma_unmap(pool, ICE_RX_DMA_ATTR);
+
+ return 0;
+}
+
+/**
+ * ice_xsk_pool_enable - enable a buffer pool region
+ * @vsi: Current VSI
+ * @pool: pointer to a requested buffer pool region
+ * @qid: queue ID
+ *
+ * Returns 0 on success, negative on failure
+ */
+static int
+ice_xsk_pool_enable(struct ice_vsi *vsi, struct xsk_buff_pool *pool, u16 qid)
+{
+ int err;
+
+ if (vsi->type != ICE_VSI_PF)
+ return -EINVAL;
+
+ if (qid >= vsi->netdev->real_num_rx_queues ||
+ qid >= vsi->netdev->real_num_tx_queues)
+ return -EINVAL;
+
+ err = xsk_pool_dma_map(pool, ice_pf_to_dev(vsi->back),
+ ICE_RX_DMA_ATTR);
+ if (err)
+ return err;
+
+ set_bit(qid, vsi->af_xdp_zc_qps);
+
+ return 0;
+}
+
+/**
+ * ice_realloc_rx_xdp_bufs - reallocate for either XSK or normal buffer
+ * @rx_ring: Rx ring
+ * @pool_present: is pool for XSK present
+ *
+ * Try allocating memory and return ENOMEM, if failed to allocate.
+ * If allocation was successful, substitute buffer with allocated one.
+ * Returns 0 on success, negative on failure
+ */
+static int
+ice_realloc_rx_xdp_bufs(struct ice_rx_ring *rx_ring, bool pool_present)
+{
+ size_t elem_size = pool_present ? sizeof(*rx_ring->xdp_buf) :
+ sizeof(*rx_ring->rx_buf);
+ void *sw_ring = kcalloc(rx_ring->count, elem_size, GFP_KERNEL);
+
+ if (!sw_ring)
+ return -ENOMEM;
+
+ if (pool_present) {
+ kfree(rx_ring->rx_buf);
+ rx_ring->rx_buf = NULL;
+ rx_ring->xdp_buf = sw_ring;
+ } else {
+ kfree(rx_ring->xdp_buf);
+ rx_ring->xdp_buf = NULL;
+ rx_ring->rx_buf = sw_ring;
+ }
+
+ return 0;
+}
+
+/**
+ * ice_realloc_zc_buf - reallocate XDP ZC queue pairs
+ * @vsi: Current VSI
+ * @zc: is zero copy set
+ *
+ * Reallocate buffer for rx_rings that might be used by XSK.
+ * XDP requires more memory, than rx_buf provides.
+ * Returns 0 on success, negative on failure
+ */
+int ice_realloc_zc_buf(struct ice_vsi *vsi, bool zc)
+{
+ struct ice_rx_ring *rx_ring;
+ unsigned long q;
+
+ for_each_set_bit(q, vsi->af_xdp_zc_qps,
+ max_t(int, vsi->alloc_txq, vsi->alloc_rxq)) {
+ rx_ring = vsi->rx_rings[q];
+ if (ice_realloc_rx_xdp_bufs(rx_ring, zc))
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+/**
+ * ice_xsk_pool_setup - enable/disable a buffer pool region depending on its state
+ * @vsi: Current VSI
+ * @pool: buffer pool to enable/associate to a ring, NULL to disable
+ * @qid: queue ID
+ *
+ * Returns 0 on success, negative on failure
+ */
+int ice_xsk_pool_setup(struct ice_vsi *vsi, struct xsk_buff_pool *pool, u16 qid)
+{
+ bool if_running, pool_present = !!pool;
+ int ret = 0, pool_failure = 0;
+
+ if (qid >= vsi->num_rxq || qid >= vsi->num_txq) {
+ netdev_err(vsi->netdev, "Please use queue id in scope of combined queues count\n");
+ pool_failure = -EINVAL;
+ goto failure;
+ }
+
+ if_running = netif_running(vsi->netdev) && ice_is_xdp_ena_vsi(vsi);
+
+ if (if_running) {
+ struct ice_rx_ring *rx_ring = vsi->rx_rings[qid];
+
+ ret = ice_qp_dis(vsi, qid);
+ if (ret) {
+ netdev_err(vsi->netdev, "ice_qp_dis error = %d\n", ret);
+ goto xsk_pool_if_up;
+ }
+
+ ret = ice_realloc_rx_xdp_bufs(rx_ring, pool_present);
+ if (ret)
+ goto xsk_pool_if_up;
+ }
+
+ pool_failure = pool_present ? ice_xsk_pool_enable(vsi, pool, qid) :
+ ice_xsk_pool_disable(vsi, qid);
+
+xsk_pool_if_up:
+ if (if_running) {
+ ret = ice_qp_ena(vsi, qid);
+ if (!ret && pool_present)
+ napi_schedule(&vsi->rx_rings[qid]->xdp_ring->q_vector->napi);
+ else if (ret)
+ netdev_err(vsi->netdev, "ice_qp_ena error = %d\n", ret);
+ }
+
+failure:
+ if (pool_failure) {
+ netdev_err(vsi->netdev, "Could not %sable buffer pool, error = %d\n",
+ pool_present ? "en" : "dis", pool_failure);
+ return pool_failure;
+ }
+
+ return ret;
+}
+
+/**
+ * ice_fill_rx_descs - pick buffers from XSK buffer pool and use it
+ * @pool: XSK Buffer pool to pull the buffers from
+ * @xdp: SW ring of xdp_buff that will hold the buffers
+ * @rx_desc: Pointer to Rx descriptors that will be filled
+ * @count: The number of buffers to allocate
+ *
+ * This function allocates a number of Rx buffers from the fill ring
+ * or the internal recycle mechanism and places them on the Rx ring.
+ *
+ * Note that ring wrap should be handled by caller of this function.
+ *
+ * Returns the amount of allocated Rx descriptors
+ */
+static u16 ice_fill_rx_descs(struct xsk_buff_pool *pool, struct xdp_buff **xdp,
+ union ice_32b_rx_flex_desc *rx_desc, u16 count)
+{
+ dma_addr_t dma;
+ u16 buffs;
+ int i;
+
+ buffs = xsk_buff_alloc_batch(pool, xdp, count);
+ for (i = 0; i < buffs; i++) {
+ dma = xsk_buff_xdp_get_dma(*xdp);
+ rx_desc->read.pkt_addr = cpu_to_le64(dma);
+ rx_desc->wb.status_error0 = 0;
+
+ rx_desc++;
+ xdp++;
+ }
+
+ return buffs;
+}
+
+/**
+ * __ice_alloc_rx_bufs_zc - allocate a number of Rx buffers
+ * @rx_ring: Rx ring
+ * @count: The number of buffers to allocate
+ *
+ * Place the @count of descriptors onto Rx ring. Handle the ring wrap
+ * for case where space from next_to_use up to the end of ring is less
+ * than @count. Finally do a tail bump.
+ *
+ * Returns true if all allocations were successful, false if any fail.
+ */
+static bool __ice_alloc_rx_bufs_zc(struct ice_rx_ring *rx_ring, u16 count)
+{
+ u32 nb_buffs_extra = 0, nb_buffs = 0;
+ union ice_32b_rx_flex_desc *rx_desc;
+ u16 ntu = rx_ring->next_to_use;
+ u16 total_count = count;
+ struct xdp_buff **xdp;
+
+ rx_desc = ICE_RX_DESC(rx_ring, ntu);
+ xdp = ice_xdp_buf(rx_ring, ntu);
+
+ if (ntu + count >= rx_ring->count) {
+ nb_buffs_extra = ice_fill_rx_descs(rx_ring->xsk_pool, xdp,
+ rx_desc,
+ rx_ring->count - ntu);
+ if (nb_buffs_extra != rx_ring->count - ntu) {
+ ntu += nb_buffs_extra;
+ goto exit;
+ }
+ rx_desc = ICE_RX_DESC(rx_ring, 0);
+ xdp = ice_xdp_buf(rx_ring, 0);
+ ntu = 0;
+ count -= nb_buffs_extra;
+ ice_release_rx_desc(rx_ring, 0);
+ }
+
+ nb_buffs = ice_fill_rx_descs(rx_ring->xsk_pool, xdp, rx_desc, count);
+
+ ntu += nb_buffs;
+ if (ntu == rx_ring->count)
+ ntu = 0;
+
+exit:
+ if (rx_ring->next_to_use != ntu)
+ ice_release_rx_desc(rx_ring, ntu);
+
+ return total_count == (nb_buffs_extra + nb_buffs);
+}
+
+/**
+ * ice_alloc_rx_bufs_zc - allocate a number of Rx buffers
+ * @rx_ring: Rx ring
+ * @count: The number of buffers to allocate
+ *
+ * Wrapper for internal allocation routine; figure out how many tail
+ * bumps should take place based on the given threshold
+ *
+ * Returns true if all calls to internal alloc routine succeeded
+ */
+bool ice_alloc_rx_bufs_zc(struct ice_rx_ring *rx_ring, u16 count)
+{
+ u16 rx_thresh = ICE_RING_QUARTER(rx_ring);
+ u16 leftover, i, tail_bumps;
+
+ tail_bumps = count / rx_thresh;
+ leftover = count - (tail_bumps * rx_thresh);
+
+ for (i = 0; i < tail_bumps; i++)
+ if (!__ice_alloc_rx_bufs_zc(rx_ring, rx_thresh))
+ return false;
+ return __ice_alloc_rx_bufs_zc(rx_ring, leftover);
+}
+
+/**
+ * ice_bump_ntc - Bump the next_to_clean counter of an Rx ring
+ * @rx_ring: Rx ring
+ */
+static void ice_bump_ntc(struct ice_rx_ring *rx_ring)
+{
+ int ntc = rx_ring->next_to_clean + 1;
+
+ ntc = (ntc < rx_ring->count) ? ntc : 0;
+ rx_ring->next_to_clean = ntc;
+ prefetch(ICE_RX_DESC(rx_ring, ntc));
+}
+
+/**
+ * ice_construct_skb_zc - Create an sk_buff from zero-copy buffer
+ * @rx_ring: Rx ring
+ * @xdp: Pointer to XDP buffer
+ *
+ * This function allocates a new skb from a zero-copy Rx buffer.
+ *
+ * Returns the skb on success, NULL on failure.
+ */
+static struct sk_buff *
+ice_construct_skb_zc(struct ice_rx_ring *rx_ring, struct xdp_buff *xdp)
+{
+ unsigned int totalsize = xdp->data_end - xdp->data_meta;
+ unsigned int metasize = xdp->data - xdp->data_meta;
+ struct sk_buff *skb;
+
+ net_prefetch(xdp->data_meta);
+
+ skb = __napi_alloc_skb(&rx_ring->q_vector->napi, totalsize,
+ GFP_ATOMIC | __GFP_NOWARN);
+ if (unlikely(!skb))
+ return NULL;
+
+ memcpy(__skb_put(skb, totalsize), xdp->data_meta,
+ ALIGN(totalsize, sizeof(long)));
+
+ if (metasize) {
+ skb_metadata_set(skb, metasize);
+ __skb_pull(skb, metasize);
+ }
+
+ xsk_buff_free(xdp);
+ return skb;
+}
+
+/**
+ * ice_run_xdp_zc - Executes an XDP program in zero-copy path
+ * @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_zc(struct ice_rx_ring *rx_ring, struct xdp_buff *xdp,
+ struct bpf_prog *xdp_prog, struct ice_tx_ring *xdp_ring)
+{
+ int err, result = ICE_XDP_PASS;
+ u32 act;
+
+ act = bpf_prog_run_xdp(xdp_prog, xdp);
+
+ if (likely(act == XDP_REDIRECT)) {
+ err = xdp_do_redirect(rx_ring->netdev, xdp, xdp_prog);
+ if (!err)
+ return ICE_XDP_REDIR;
+ if (xsk_uses_need_wakeup(rx_ring->xsk_pool) && err == -ENOBUFS)
+ result = ICE_XDP_EXIT;
+ else
+ result = ICE_XDP_CONSUMED;
+ goto out_failure;
+ }
+
+ switch (act) {
+ case XDP_PASS:
+ break;
+ case XDP_TX:
+ result = ice_xmit_xdp_buff(xdp, xdp_ring);
+ if (result == ICE_XDP_CONSUMED)
+ goto out_failure;
+ break;
+ case XDP_DROP:
+ result = ICE_XDP_CONSUMED;
+ break;
+ default:
+ bpf_warn_invalid_xdp_action(rx_ring->netdev, xdp_prog, act);
+ fallthrough;
+ case XDP_ABORTED:
+ result = ICE_XDP_CONSUMED;
+out_failure:
+ trace_xdp_exception(rx_ring->netdev, xdp_prog, act);
+ break;
+ }
+
+ return result;
+}
+
+/**
+ * ice_clean_rx_irq_zc - consumes packets from the hardware ring
+ * @rx_ring: AF_XDP Rx ring
+ * @budget: NAPI budget
+ *
+ * Returns number of processed packets on success, remaining budget on failure.
+ */
+int ice_clean_rx_irq_zc(struct ice_rx_ring *rx_ring, int budget)
+{
+ unsigned int total_rx_bytes = 0, total_rx_packets = 0;
+ struct ice_tx_ring *xdp_ring;
+ unsigned int xdp_xmit = 0;
+ struct bpf_prog *xdp_prog;
+ bool failure = false;
+ int entries_to_alloc;
+
+ /* ZC patch is enabled only when XDP program is set,
+ * so here it can not be NULL
+ */
+ xdp_prog = READ_ONCE(rx_ring->xdp_prog);
+ xdp_ring = rx_ring->xdp_ring;
+
+ while (likely(total_rx_packets < (unsigned int)budget)) {
+ union ice_32b_rx_flex_desc *rx_desc;
+ unsigned int size, xdp_res = 0;
+ struct xdp_buff *xdp;
+ struct sk_buff *skb;
+ u16 stat_err_bits;
+ u16 vlan_tag = 0;
+ u16 rx_ptype;
+
+ rx_desc = ICE_RX_DESC(rx_ring, rx_ring->next_to_clean);
+
+ 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 have
+ * verified the descriptor has been written back.
+ */
+ dma_rmb();
+
+ if (unlikely(rx_ring->next_to_clean == rx_ring->next_to_use))
+ break;
+
+ xdp = *ice_xdp_buf(rx_ring, rx_ring->next_to_clean);
+
+ size = le16_to_cpu(rx_desc->wb.pkt_len) &
+ ICE_RX_FLX_DESC_PKT_LEN_M;
+ if (!size) {
+ xdp->data = NULL;
+ xdp->data_end = NULL;
+ xdp->data_hard_start = NULL;
+ xdp->data_meta = NULL;
+ goto construct_skb;
+ }
+
+ xsk_buff_set_size(xdp, size);
+ xsk_buff_dma_sync_for_cpu(xdp, rx_ring->xsk_pool);
+
+ xdp_res = ice_run_xdp_zc(rx_ring, xdp, xdp_prog, xdp_ring);
+ if (likely(xdp_res & (ICE_XDP_TX | ICE_XDP_REDIR))) {
+ xdp_xmit |= xdp_res;
+ } else if (xdp_res == ICE_XDP_EXIT) {
+ failure = true;
+ break;
+ } else if (xdp_res == ICE_XDP_CONSUMED) {
+ xsk_buff_free(xdp);
+ } else if (xdp_res == ICE_XDP_PASS) {
+ goto construct_skb;
+ }
+
+ total_rx_bytes += size;
+ total_rx_packets++;
+
+ ice_bump_ntc(rx_ring);
+ continue;
+
+construct_skb:
+ /* XDP_PASS path */
+ skb = ice_construct_skb_zc(rx_ring, xdp);
+ if (!skb) {
+ rx_ring->rx_stats.alloc_buf_failed++;
+ break;
+ }
+
+ ice_bump_ntc(rx_ring);
+
+ if (eth_skb_pad(skb)) {
+ skb = NULL;
+ continue;
+ }
+
+ total_rx_bytes += skb->len;
+ total_rx_packets++;
+
+ vlan_tag = ice_get_vlan_tag_from_rx_desc(rx_desc);
+
+ 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_receive_skb(rx_ring, skb, vlan_tag);
+ }
+
+ entries_to_alloc = ICE_DESC_UNUSED(rx_ring);
+ if (entries_to_alloc > ICE_RING_QUARTER(rx_ring))
+ failure |= !ice_alloc_rx_bufs_zc(rx_ring, entries_to_alloc);
+
+ ice_finalize_xdp_rx(xdp_ring, xdp_xmit);
+ ice_update_rx_ring_stats(rx_ring, total_rx_packets, total_rx_bytes);
+
+ if (xsk_uses_need_wakeup(rx_ring->xsk_pool)) {
+ if (failure || rx_ring->next_to_clean == rx_ring->next_to_use)
+ xsk_set_rx_need_wakeup(rx_ring->xsk_pool);
+ else
+ xsk_clear_rx_need_wakeup(rx_ring->xsk_pool);
+
+ return (int)total_rx_packets;
+ }
+
+ return failure ? budget : (int)total_rx_packets;
+}
+
+/**
+ * ice_clean_xdp_tx_buf - Free and unmap XDP Tx buffer
+ * @xdp_ring: XDP Tx ring
+ * @tx_buf: Tx buffer to clean
+ */
+static void
+ice_clean_xdp_tx_buf(struct ice_tx_ring *xdp_ring, struct ice_tx_buf *tx_buf)
+{
+ page_frag_free(tx_buf->raw_buf);
+ xdp_ring->xdp_tx_active--;
+ dma_unmap_single(xdp_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_clean_xdp_irq_zc - produce AF_XDP descriptors to CQ
+ * @xdp_ring: XDP Tx ring
+ */
+static void ice_clean_xdp_irq_zc(struct ice_tx_ring *xdp_ring)
+{
+ u16 ntc = xdp_ring->next_to_clean;
+ struct ice_tx_desc *tx_desc;
+ u16 cnt = xdp_ring->count;
+ struct ice_tx_buf *tx_buf;
+ u16 completed_frames = 0;
+ u16 xsk_frames = 0;
+ u16 last_rs;
+ int i;
+
+ last_rs = xdp_ring->next_to_use ? xdp_ring->next_to_use - 1 : cnt - 1;
+ tx_desc = ICE_TX_DESC(xdp_ring, last_rs);
+ if ((tx_desc->cmd_type_offset_bsz &
+ cpu_to_le64(ICE_TX_DESC_DTYPE_DESC_DONE))) {
+ if (last_rs >= ntc)
+ completed_frames = last_rs - ntc + 1;
+ else
+ completed_frames = last_rs + cnt - ntc + 1;
+ }
+
+ if (!completed_frames)
+ return;
+
+ if (likely(!xdp_ring->xdp_tx_active)) {
+ xsk_frames = completed_frames;
+ goto skip;
+ }
+
+ ntc = xdp_ring->next_to_clean;
+ for (i = 0; i < completed_frames; i++) {
+ tx_buf = &xdp_ring->tx_buf[ntc];
+
+ if (tx_buf->raw_buf) {
+ ice_clean_xdp_tx_buf(xdp_ring, tx_buf);
+ tx_buf->raw_buf = NULL;
+ } else {
+ xsk_frames++;
+ }
+
+ ntc++;
+ if (ntc >= xdp_ring->count)
+ ntc = 0;
+ }
+skip:
+ tx_desc->cmd_type_offset_bsz = 0;
+ xdp_ring->next_to_clean += completed_frames;
+ if (xdp_ring->next_to_clean >= cnt)
+ xdp_ring->next_to_clean -= cnt;
+ if (xsk_frames)
+ xsk_tx_completed(xdp_ring->xsk_pool, xsk_frames);
+}
+
+/**
+ * ice_xmit_pkt - produce a single HW Tx descriptor out of AF_XDP descriptor
+ * @xdp_ring: XDP ring to produce the HW Tx descriptor on
+ * @desc: AF_XDP descriptor to pull the DMA address and length from
+ * @total_bytes: bytes accumulator that will be used for stats update
+ */
+static void ice_xmit_pkt(struct ice_tx_ring *xdp_ring, struct xdp_desc *desc,
+ unsigned int *total_bytes)
+{
+ struct ice_tx_desc *tx_desc;
+ dma_addr_t dma;
+
+ dma = xsk_buff_raw_get_dma(xdp_ring->xsk_pool, desc->addr);
+ xsk_buff_raw_dma_sync_for_device(xdp_ring->xsk_pool, dma, desc->len);
+
+ tx_desc = ICE_TX_DESC(xdp_ring, xdp_ring->next_to_use++);
+ tx_desc->buf_addr = cpu_to_le64(dma);
+ tx_desc->cmd_type_offset_bsz = ice_build_ctob(ICE_TX_DESC_CMD_EOP,
+ 0, desc->len, 0);
+
+ *total_bytes += desc->len;
+}
+
+/**
+ * ice_xmit_pkt_batch - produce a batch of HW Tx descriptors out of AF_XDP descriptors
+ * @xdp_ring: XDP ring to produce the HW Tx descriptors on
+ * @descs: AF_XDP descriptors to pull the DMA addresses and lengths from
+ * @total_bytes: bytes accumulator that will be used for stats update
+ */
+static void ice_xmit_pkt_batch(struct ice_tx_ring *xdp_ring, struct xdp_desc *descs,
+ unsigned int *total_bytes)
+{
+ u16 ntu = xdp_ring->next_to_use;
+ struct ice_tx_desc *tx_desc;
+ u32 i;
+
+ loop_unrolled_for(i = 0; i < PKTS_PER_BATCH; i++) {
+ dma_addr_t dma;
+
+ dma = xsk_buff_raw_get_dma(xdp_ring->xsk_pool, descs[i].addr);
+ xsk_buff_raw_dma_sync_for_device(xdp_ring->xsk_pool, dma, descs[i].len);
+
+ tx_desc = ICE_TX_DESC(xdp_ring, ntu++);
+ tx_desc->buf_addr = cpu_to_le64(dma);
+ tx_desc->cmd_type_offset_bsz = ice_build_ctob(ICE_TX_DESC_CMD_EOP,
+ 0, descs[i].len, 0);
+
+ *total_bytes += descs[i].len;
+ }
+
+ xdp_ring->next_to_use = ntu;
+}
+
+/**
+ * ice_fill_tx_hw_ring - produce the number of Tx descriptors onto ring
+ * @xdp_ring: XDP ring to produce the HW Tx descriptors on
+ * @descs: AF_XDP descriptors to pull the DMA addresses and lengths from
+ * @nb_pkts: count of packets to be send
+ * @total_bytes: bytes accumulator that will be used for stats update
+ */
+static void ice_fill_tx_hw_ring(struct ice_tx_ring *xdp_ring, struct xdp_desc *descs,
+ u32 nb_pkts, unsigned int *total_bytes)
+{
+ u32 batched, leftover, i;
+
+ batched = ALIGN_DOWN(nb_pkts, PKTS_PER_BATCH);
+ leftover = nb_pkts & (PKTS_PER_BATCH - 1);
+ for (i = 0; i < batched; i += PKTS_PER_BATCH)
+ ice_xmit_pkt_batch(xdp_ring, &descs[i], total_bytes);
+ for (; i < batched + leftover; i++)
+ ice_xmit_pkt(xdp_ring, &descs[i], total_bytes);
+}
+
+/**
+ * ice_set_rs_bit - set RS bit on last produced descriptor (one behind current NTU)
+ * @xdp_ring: XDP ring to produce the HW Tx descriptors on
+ */
+static void ice_set_rs_bit(struct ice_tx_ring *xdp_ring)
+{
+ u16 ntu = xdp_ring->next_to_use ? xdp_ring->next_to_use - 1 : xdp_ring->count - 1;
+ struct ice_tx_desc *tx_desc;
+
+ tx_desc = ICE_TX_DESC(xdp_ring, ntu);
+ tx_desc->cmd_type_offset_bsz |=
+ cpu_to_le64(ICE_TX_DESC_CMD_RS << ICE_TXD_QW1_CMD_S);
+}
+
+/**
+ * ice_xmit_zc - take entries from XSK Tx ring and place them onto HW Tx ring
+ * @xdp_ring: XDP ring to produce the HW Tx descriptors on
+ *
+ * Returns true if there is no more work that needs to be done, false otherwise
+ */
+bool ice_xmit_zc(struct ice_tx_ring *xdp_ring)
+{
+ struct xdp_desc *descs = xdp_ring->xsk_pool->tx_descs;
+ u32 nb_pkts, nb_processed = 0;
+ unsigned int total_bytes = 0;
+ int budget;
+
+ ice_clean_xdp_irq_zc(xdp_ring);
+
+ budget = ICE_DESC_UNUSED(xdp_ring);
+ budget = min_t(u16, budget, ICE_RING_QUARTER(xdp_ring));
+
+ nb_pkts = xsk_tx_peek_release_desc_batch(xdp_ring->xsk_pool, budget);
+ if (!nb_pkts)
+ return true;
+
+ if (xdp_ring->next_to_use + nb_pkts >= xdp_ring->count) {
+ nb_processed = xdp_ring->count - xdp_ring->next_to_use;
+ ice_fill_tx_hw_ring(xdp_ring, descs, nb_processed, &total_bytes);
+ xdp_ring->next_to_use = 0;
+ }
+
+ ice_fill_tx_hw_ring(xdp_ring, &descs[nb_processed], nb_pkts - nb_processed,
+ &total_bytes);
+
+ ice_set_rs_bit(xdp_ring);
+ ice_xdp_ring_update_tail(xdp_ring);
+ ice_update_tx_ring_stats(xdp_ring, nb_pkts, total_bytes);
+
+ if (xsk_uses_need_wakeup(xdp_ring->xsk_pool))
+ xsk_set_tx_need_wakeup(xdp_ring->xsk_pool);
+
+ return nb_pkts < budget;
+}
+
+/**
+ * ice_xsk_wakeup - Implements ndo_xsk_wakeup
+ * @netdev: net_device
+ * @queue_id: queue to wake up
+ * @flags: ignored in our case, since we have Rx and Tx in the same NAPI
+ *
+ * Returns negative on error, zero otherwise.
+ */
+int
+ice_xsk_wakeup(struct net_device *netdev, u32 queue_id,
+ u32 __always_unused flags)
+{
+ struct ice_netdev_priv *np = netdev_priv(netdev);
+ struct ice_q_vector *q_vector;
+ struct ice_vsi *vsi = np->vsi;
+ struct ice_tx_ring *ring;
+
+ if (test_bit(ICE_VSI_DOWN, vsi->state))
+ return -ENETDOWN;
+
+ if (!ice_is_xdp_ena_vsi(vsi))
+ return -EINVAL;
+
+ if (queue_id >= vsi->num_txq || queue_id >= vsi->num_rxq)
+ return -EINVAL;
+
+ ring = vsi->rx_rings[queue_id]->xdp_ring;
+
+ if (!ring->xsk_pool)
+ return -EINVAL;
+
+ /* The idea here is that if NAPI is running, mark a miss, so
+ * it will run again. If not, trigger an interrupt and
+ * schedule the NAPI from interrupt context. If NAPI would be
+ * scheduled here, the interrupt affinity would not be
+ * honored.
+ */
+ q_vector = ring->q_vector;
+ if (!napi_if_scheduled_mark_missed(&q_vector->napi))
+ ice_trigger_sw_intr(&vsi->back->hw, q_vector);
+
+ return 0;
+}
+
+/**
+ * ice_xsk_any_rx_ring_ena - Checks if Rx rings have AF_XDP buff pool attached
+ * @vsi: VSI to be checked
+ *
+ * Returns true if any of the Rx rings has an AF_XDP buff pool attached
+ */
+bool ice_xsk_any_rx_ring_ena(struct ice_vsi *vsi)
+{
+ int i;
+
+ ice_for_each_rxq(vsi, i) {
+ if (xsk_get_pool_from_qid(vsi->netdev, i))
+ return true;
+ }
+
+ return false;
+}
+
+/**
+ * ice_xsk_clean_rx_ring - clean buffer pool queues connected to a given Rx ring
+ * @rx_ring: ring to be cleaned
+ */
+void ice_xsk_clean_rx_ring(struct ice_rx_ring *rx_ring)
+{
+ u16 ntc = rx_ring->next_to_clean;
+ u16 ntu = rx_ring->next_to_use;
+
+ while (ntc != ntu) {
+ struct xdp_buff *xdp = *ice_xdp_buf(rx_ring, ntc);
+
+ xsk_buff_free(xdp);
+ ntc++;
+ if (ntc >= rx_ring->count)
+ ntc = 0;
+ }
+}
+
+/**
+ * ice_xsk_clean_xdp_ring - Clean the XDP Tx ring and its buffer pool queues
+ * @xdp_ring: XDP_Tx ring
+ */
+void ice_xsk_clean_xdp_ring(struct ice_tx_ring *xdp_ring)
+{
+ u16 ntc = xdp_ring->next_to_clean, ntu = xdp_ring->next_to_use;
+ u32 xsk_frames = 0;
+
+ while (ntc != ntu) {
+ struct ice_tx_buf *tx_buf = &xdp_ring->tx_buf[ntc];
+
+ if (tx_buf->raw_buf)
+ ice_clean_xdp_tx_buf(xdp_ring, tx_buf);
+ else
+ xsk_frames++;
+
+ tx_buf->raw_buf = NULL;
+
+ ntc++;
+ if (ntc >= xdp_ring->count)
+ ntc = 0;
+ }
+
+ if (xsk_frames)
+ xsk_tx_completed(xdp_ring->xsk_pool, xsk_frames);
+}