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path: root/drivers/net/ethernet/aquantia/atlantic/aq_ring.c
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Diffstat (limited to 'drivers/net/ethernet/aquantia/atlantic/aq_ring.c')
-rw-r--r--drivers/net/ethernet/aquantia/atlantic/aq_ring.c326
1 files changed, 326 insertions, 0 deletions
diff --git a/drivers/net/ethernet/aquantia/atlantic/aq_ring.c b/drivers/net/ethernet/aquantia/atlantic/aq_ring.c
new file mode 100644
index 000000000000..0358e6072d45
--- /dev/null
+++ b/drivers/net/ethernet/aquantia/atlantic/aq_ring.c
@@ -0,0 +1,326 @@
+/*
+ * aQuantia Corporation Network Driver
+ * Copyright (C) 2014-2017 aQuantia Corporation. All rights reserved
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ */
+
+/* File aq_ring.c: Definition of functions for Rx/Tx rings. */
+
+#include "aq_ring.h"
+#include "aq_nic.h"
+#include "aq_hw.h"
+
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+
+static struct aq_ring_s *aq_ring_alloc(struct aq_ring_s *self,
+ struct aq_nic_s *aq_nic)
+{
+ int err = 0;
+
+ self->buff_ring =
+ kcalloc(self->size, sizeof(struct aq_ring_buff_s), GFP_KERNEL);
+
+ if (!self->buff_ring) {
+ err = -ENOMEM;
+ goto err_exit;
+ }
+ self->dx_ring = dma_alloc_coherent(aq_nic_get_dev(aq_nic),
+ self->size * self->dx_size,
+ &self->dx_ring_pa, GFP_KERNEL);
+ if (!self->dx_ring) {
+ err = -ENOMEM;
+ goto err_exit;
+ }
+
+err_exit:
+ if (err < 0) {
+ aq_ring_free(self);
+ self = NULL;
+ }
+ return self;
+}
+
+struct aq_ring_s *aq_ring_tx_alloc(struct aq_ring_s *self,
+ struct aq_nic_s *aq_nic,
+ unsigned int idx,
+ struct aq_nic_cfg_s *aq_nic_cfg)
+{
+ int err = 0;
+
+ self->aq_nic = aq_nic;
+ self->idx = idx;
+ self->size = aq_nic_cfg->txds;
+ self->dx_size = aq_nic_cfg->aq_hw_caps->txd_size;
+
+ self = aq_ring_alloc(self, aq_nic);
+ if (!self) {
+ err = -ENOMEM;
+ goto err_exit;
+ }
+
+err_exit:
+ if (err < 0) {
+ aq_ring_free(self);
+ self = NULL;
+ }
+ return self;
+}
+
+struct aq_ring_s *aq_ring_rx_alloc(struct aq_ring_s *self,
+ struct aq_nic_s *aq_nic,
+ unsigned int idx,
+ struct aq_nic_cfg_s *aq_nic_cfg)
+{
+ int err = 0;
+
+ self->aq_nic = aq_nic;
+ self->idx = idx;
+ self->size = aq_nic_cfg->rxds;
+ self->dx_size = aq_nic_cfg->aq_hw_caps->rxd_size;
+
+ self = aq_ring_alloc(self, aq_nic);
+ if (!self) {
+ err = -ENOMEM;
+ goto err_exit;
+ }
+
+err_exit:
+ if (err < 0) {
+ aq_ring_free(self);
+ self = NULL;
+ }
+ return self;
+}
+
+int aq_ring_init(struct aq_ring_s *self)
+{
+ self->hw_head = 0;
+ self->sw_head = 0;
+ self->sw_tail = 0;
+ return 0;
+}
+
+void aq_ring_tx_clean(struct aq_ring_s *self)
+{
+ struct device *dev = aq_nic_get_dev(self->aq_nic);
+
+ for (; self->sw_head != self->hw_head;
+ self->sw_head = aq_ring_next_dx(self, self->sw_head)) {
+ struct aq_ring_buff_s *buff = &self->buff_ring[self->sw_head];
+
+ if (likely(buff->is_mapped)) {
+ if (unlikely(buff->is_sop))
+ dma_unmap_single(dev, buff->pa, buff->len,
+ DMA_TO_DEVICE);
+ else
+ dma_unmap_page(dev, buff->pa, buff->len,
+ DMA_TO_DEVICE);
+ }
+
+ if (unlikely(buff->is_eop))
+ dev_kfree_skb_any(buff->skb);
+ }
+}
+
+static inline unsigned int aq_ring_dx_in_range(unsigned int h, unsigned int i,
+ unsigned int t)
+{
+ return (h < t) ? ((h < i) && (i < t)) : ((h < i) || (i < t));
+}
+
+#define AQ_SKB_ALIGN SKB_DATA_ALIGN(sizeof(struct skb_shared_info))
+int aq_ring_rx_clean(struct aq_ring_s *self, int *work_done, int budget)
+{
+ struct net_device *ndev = aq_nic_get_ndev(self->aq_nic);
+ int err = 0;
+ bool is_rsc_completed = true;
+
+ for (; (self->sw_head != self->hw_head) && budget;
+ self->sw_head = aq_ring_next_dx(self, self->sw_head),
+ --budget, ++(*work_done)) {
+ struct aq_ring_buff_s *buff = &self->buff_ring[self->sw_head];
+ struct sk_buff *skb = NULL;
+ unsigned int next_ = 0U;
+ unsigned int i = 0U;
+ struct aq_ring_buff_s *buff_ = NULL;
+
+ if (buff->is_error) {
+ __free_pages(buff->page, 0);
+ continue;
+ }
+
+ if (buff->is_cleaned)
+ continue;
+
+ if (!buff->is_eop) {
+ for (next_ = buff->next,
+ buff_ = &self->buff_ring[next_]; true;
+ next_ = buff_->next,
+ buff_ = &self->buff_ring[next_]) {
+ is_rsc_completed =
+ aq_ring_dx_in_range(self->sw_head,
+ next_,
+ self->hw_head);
+
+ if (unlikely(!is_rsc_completed)) {
+ is_rsc_completed = false;
+ break;
+ }
+
+ if (buff_->is_eop)
+ break;
+ }
+
+ if (!is_rsc_completed) {
+ err = 0;
+ goto err_exit;
+ }
+ }
+
+ /* for single fragment packets use build_skb() */
+ if (buff->is_eop) {
+ skb = build_skb(page_address(buff->page),
+ buff->len + AQ_SKB_ALIGN);
+ if (unlikely(!skb)) {
+ err = -ENOMEM;
+ goto err_exit;
+ }
+
+ skb_put(skb, buff->len);
+ } else {
+ skb = netdev_alloc_skb(ndev, ETH_HLEN);
+ if (unlikely(!skb)) {
+ err = -ENOMEM;
+ goto err_exit;
+ }
+ skb_put(skb, ETH_HLEN);
+ memcpy(skb->data, page_address(buff->page), ETH_HLEN);
+
+ skb_add_rx_frag(skb, 0, buff->page, ETH_HLEN,
+ buff->len - ETH_HLEN,
+ SKB_TRUESIZE(buff->len - ETH_HLEN));
+
+ for (i = 1U, next_ = buff->next,
+ buff_ = &self->buff_ring[next_]; true;
+ next_ = buff_->next,
+ buff_ = &self->buff_ring[next_], ++i) {
+ skb_add_rx_frag(skb, i, buff_->page, 0,
+ buff_->len,
+ SKB_TRUESIZE(buff->len -
+ ETH_HLEN));
+ buff_->is_cleaned = 1;
+
+ if (buff_->is_eop)
+ break;
+ }
+ }
+
+ skb->protocol = eth_type_trans(skb, ndev);
+ if (unlikely(buff->is_cso_err)) {
+ ++self->stats.rx.errors;
+ __skb_mark_checksum_bad(skb);
+ } else {
+ if (buff->is_ip_cso) {
+ __skb_incr_checksum_unnecessary(skb);
+ if (buff->is_udp_cso || buff->is_tcp_cso)
+ __skb_incr_checksum_unnecessary(skb);
+ } else {
+ skb->ip_summed = CHECKSUM_NONE;
+ }
+ }
+
+ skb_set_hash(skb, buff->rss_hash,
+ buff->is_hash_l4 ? PKT_HASH_TYPE_L4 :
+ PKT_HASH_TYPE_NONE);
+
+ skb_record_rx_queue(skb, self->idx);
+
+ netif_receive_skb(skb);
+
+ ++self->stats.rx.packets;
+ self->stats.rx.bytes += skb->len;
+ }
+
+err_exit:
+ return err;
+}
+
+int aq_ring_rx_fill(struct aq_ring_s *self)
+{
+ unsigned int pages_order = fls(AQ_CFG_RX_FRAME_MAX / PAGE_SIZE +
+ (AQ_CFG_RX_FRAME_MAX % PAGE_SIZE ? 1 : 0)) - 1;
+ struct aq_ring_buff_s *buff = NULL;
+ int err = 0;
+ int i = 0;
+
+ for (i = aq_ring_avail_dx(self); i--;
+ self->sw_tail = aq_ring_next_dx(self, self->sw_tail)) {
+ buff = &self->buff_ring[self->sw_tail];
+
+ buff->flags = 0U;
+ buff->len = AQ_CFG_RX_FRAME_MAX;
+
+ buff->page = alloc_pages(GFP_ATOMIC | __GFP_COLD |
+ __GFP_COMP, pages_order);
+ if (!buff->page) {
+ err = -ENOMEM;
+ goto err_exit;
+ }
+
+ buff->pa = dma_map_page(aq_nic_get_dev(self->aq_nic),
+ buff->page, 0,
+ AQ_CFG_RX_FRAME_MAX, DMA_FROM_DEVICE);
+
+ if (dma_mapping_error(aq_nic_get_dev(self->aq_nic), buff->pa)) {
+ err = -ENOMEM;
+ goto err_exit;
+ }
+
+ buff = NULL;
+ }
+
+err_exit:
+ if (err < 0) {
+ if (buff && buff->page)
+ __free_pages(buff->page, 0);
+ }
+
+ return err;
+}
+
+void aq_ring_rx_deinit(struct aq_ring_s *self)
+{
+ if (!self)
+ goto err_exit;
+
+ for (; self->sw_head != self->sw_tail;
+ self->sw_head = aq_ring_next_dx(self, self->sw_head)) {
+ struct aq_ring_buff_s *buff = &self->buff_ring[self->sw_head];
+
+ dma_unmap_page(aq_nic_get_dev(self->aq_nic), buff->pa,
+ AQ_CFG_RX_FRAME_MAX, DMA_FROM_DEVICE);
+
+ __free_pages(buff->page, 0);
+ }
+
+err_exit:;
+}
+
+void aq_ring_free(struct aq_ring_s *self)
+{
+ if (!self)
+ goto err_exit;
+
+ kfree(self->buff_ring);
+
+ if (self->dx_ring)
+ dma_free_coherent(aq_nic_get_dev(self->aq_nic),
+ self->size * self->dx_size, self->dx_ring,
+ self->dx_ring_pa);
+
+err_exit:;
+}
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