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Subject[PATCH v3 4/7] octeon_ep: add Tx/Rx ring resource setup and cleanup
Date
Implement Tx/Rx ring resource allocation and cleanup.

Signed-off-by: Veerasenareddy Burru <vburru@marvell.com>
Signed-off-by: Abhijit Ayarekar <aayarekar@marvell.com>
Signed-off-by: Satananda Burla <sburla@marvell.com>
---
V2 -> V3:
- fix the implicit declaration errors for vmalloc() and vfree()
calls, reported by kernel test robot:
Reported-by: kernel test robot <lkp@intel.com>

V1 -> V2:
- created by dividing PATCH 1/4 of original patch series

.../net/ethernet/marvell/octeon_ep/octep_rx.c | 222 ++++++++++++++++++
.../net/ethernet/marvell/octeon_ep/octep_tx.c | 219 +++++++++++++++++
2 files changed, 441 insertions(+)

diff --git a/drivers/net/ethernet/marvell/octeon_ep/octep_rx.c b/drivers/net/ethernet/marvell/octeon_ep/octep_rx.c
index 4fa67f305cc8..7086ede58475 100644
--- a/drivers/net/ethernet/marvell/octeon_ep/octep_rx.c
+++ b/drivers/net/ethernet/marvell/octeon_ep/octep_rx.c
@@ -7,10 +7,199 @@

#include <linux/pci.h>
#include <linux/etherdevice.h>
+#include <linux/vmalloc.h>

#include "octep_config.h"
#include "octep_main.h"

+static void octep_oq_reset_indices(struct octep_oq *oq)
+{
+ oq->host_read_idx = 0;
+ oq->host_refill_idx = 0;
+ oq->refill_count = 0;
+ oq->last_pkt_count = 0;
+ oq->pkts_pending = 0;
+}
+
+/**
+ * octep_oq_fill_ring_buffers() - fill initial receive buffers for Rx ring.
+ *
+ * @oq: Octeon Rx queue data structure.
+ *
+ * Return: 0, if successfully filled receive buffers for all descriptors.
+ * -1, if failed to allocate a buffer or failed to map for DMA.
+ */
+static int octep_oq_fill_ring_buffers(struct octep_oq *oq)
+{
+ struct octep_oq_desc_hw *desc_ring = oq->desc_ring;
+ struct page *page;
+ u32 i;
+
+ for (i = 0; i < oq->max_count; i++) {
+ page = dev_alloc_page();
+ if (unlikely(!page)) {
+ dev_err(oq->dev, "Rx buffer alloc failed\n");
+ goto rx_buf_alloc_err;
+ }
+ desc_ring[i].buffer_ptr = dma_map_page(oq->dev, page, 0,
+ PAGE_SIZE,
+ DMA_FROM_DEVICE);
+ if (dma_mapping_error(oq->dev, desc_ring[i].buffer_ptr)) {
+ dev_err(oq->dev,
+ "OQ-%d buffer alloc: DMA mapping error!\n",
+ oq->q_no);
+ put_page(page);
+ goto dma_map_err;
+ }
+ oq->buff_info[i].page = page;
+ }
+
+ return 0;
+
+dma_map_err:
+rx_buf_alloc_err:
+ while (i) {
+ i--;
+ dma_unmap_page(oq->dev, desc_ring[i].buffer_ptr, PAGE_SIZE, DMA_FROM_DEVICE);
+ put_page(oq->buff_info[i].page);
+ oq->buff_info[i].page = NULL;
+ }
+
+ return -1;
+}
+
+/**
+ * octep_setup_oq() - Setup a Rx queue.
+ *
+ * @oct: Octeon device private data structure.
+ * @q_no: Rx queue number to be setup.
+ *
+ * Allocate resources for a Rx queue.
+ */
+static int octep_setup_oq(struct octep_device *oct, int q_no)
+{
+ struct octep_oq *oq;
+ u32 desc_ring_size;
+
+ oq = vzalloc(sizeof(*oq));
+ if (!oq)
+ goto create_oq_fail;
+ oct->oq[q_no] = oq;
+
+ oq->octep_dev = oct;
+ oq->netdev = oct->netdev;
+ oq->dev = &oct->pdev->dev;
+ oq->q_no = q_no;
+ oq->max_count = CFG_GET_OQ_NUM_DESC(oct->conf);
+ oq->ring_size_mask = oq->max_count - 1;
+ oq->buffer_size = CFG_GET_OQ_BUF_SIZE(oct->conf);
+ oq->max_single_buffer_size = oq->buffer_size - OCTEP_OQ_RESP_HW_SIZE;
+
+ /* When the hardware/firmware supports additional capabilities,
+ * additional header is filled-in by Octeon after length field in
+ * Rx packets. this header contains additional packet information.
+ */
+ if (oct->caps_enabled)
+ oq->max_single_buffer_size -= OCTEP_OQ_RESP_HW_EXT_SIZE;
+
+ oq->refill_threshold = CFG_GET_OQ_REFILL_THRESHOLD(oct->conf);
+
+ desc_ring_size = oq->max_count * OCTEP_OQ_DESC_SIZE;
+ oq->desc_ring = dma_alloc_coherent(oq->dev, desc_ring_size,
+ &oq->desc_ring_dma, GFP_KERNEL);
+
+ if (unlikely(!oq->desc_ring)) {
+ dev_err(oq->dev,
+ "Failed to allocate DMA memory for OQ-%d !!\n", q_no);
+ goto desc_dma_alloc_err;
+ }
+
+ oq->buff_info = (struct octep_rx_buffer *)
+ vzalloc(oq->max_count * OCTEP_OQ_RECVBUF_SIZE);
+ if (unlikely(!oq->buff_info)) {
+ dev_err(&oct->pdev->dev,
+ "Failed to allocate buffer info for OQ-%d\n", q_no);
+ goto buf_list_err;
+ }
+
+ if (octep_oq_fill_ring_buffers(oq))
+ goto oq_fill_buff_err;
+
+ octep_oq_reset_indices(oq);
+ oct->hw_ops.setup_oq_regs(oct, q_no);
+ oct->num_oqs++;
+
+ return 0;
+
+oq_fill_buff_err:
+ vfree(oq->buff_info);
+ oq->buff_info = NULL;
+buf_list_err:
+ dma_free_coherent(oq->dev, desc_ring_size,
+ oq->desc_ring, oq->desc_ring_dma);
+ oq->desc_ring = NULL;
+desc_dma_alloc_err:
+ vfree(oq);
+ oct->oq[q_no] = NULL;
+create_oq_fail:
+ return -1;
+}
+
+/**
+ * octep_oq_free_ring_buffers() - Free ring buffers.
+ *
+ * @oq: Octeon Rx queue data structure.
+ *
+ * Free receive buffers in unused Rx queue descriptors.
+ */
+static void octep_oq_free_ring_buffers(struct octep_oq *oq)
+{
+ struct octep_oq_desc_hw *desc_ring = oq->desc_ring;
+ int i;
+
+ if (!oq->desc_ring || !oq->buff_info)
+ return;
+
+ for (i = 0; i < oq->max_count; i++) {
+ if (oq->buff_info[i].page) {
+ dma_unmap_page(oq->dev, desc_ring[i].buffer_ptr,
+ PAGE_SIZE, DMA_FROM_DEVICE);
+ put_page(oq->buff_info[i].page);
+ oq->buff_info[i].page = NULL;
+ desc_ring[i].buffer_ptr = 0;
+ }
+ }
+ octep_oq_reset_indices(oq);
+}
+
+/**
+ * octep_free_oq() - Free Rx queue resources.
+ *
+ * @oq: Octeon Rx queue data structure.
+ *
+ * Free all resources of a Rx queue.
+ */
+static int octep_free_oq(struct octep_oq *oq)
+{
+ struct octep_device *oct = oq->octep_dev;
+ int q_no = oq->q_no;
+
+ octep_oq_free_ring_buffers(oq);
+
+ if (oq->buff_info)
+ vfree(oq->buff_info);
+
+ if (oq->desc_ring)
+ dma_free_coherent(oq->dev,
+ oq->max_count * OCTEP_OQ_DESC_SIZE,
+ oq->desc_ring, oq->desc_ring_dma);
+
+ vfree(oq);
+ oct->oq[q_no] = NULL;
+ oct->num_oqs--;
+ return 0;
+}
+
/**
* octep_setup_oqs() - setup resources for all Rx queues.
*
@@ -18,6 +207,26 @@
*/
int octep_setup_oqs(struct octep_device *oct)
{
+ int i, retval = 0;
+
+ oct->num_oqs = 0;
+ for (i = 0; i < CFG_GET_PORTS_ACTIVE_IO_RINGS(oct->conf); i++) {
+ retval = octep_setup_oq(oct, i);
+ if (retval) {
+ dev_err(&oct->pdev->dev,
+ "Failed to setup OQ(RxQ)-%d.\n", i);
+ goto oq_setup_err;
+ }
+ dev_dbg(&oct->pdev->dev, "Successfully setup OQ(RxQ)-%d.\n", i);
+ }
+
+ return 0;
+
+oq_setup_err:
+ while (i) {
+ i--;
+ octep_free_oq(oct->oq[i]);
+ }
return -1;
}

@@ -30,6 +239,10 @@ int octep_setup_oqs(struct octep_device *oct)
*/
void octep_oq_dbell_init(struct octep_device *oct)
{
+ int i;
+
+ for (i = 0; i < oct->num_oqs; i++)
+ writel(oct->oq[i]->max_count, oct->oq[i]->pkts_credit_reg);
}

/**
@@ -39,4 +252,13 @@ void octep_oq_dbell_init(struct octep_device *oct)
*/
void octep_free_oqs(struct octep_device *oct)
{
+ int i;
+
+ for (i = 0; i < CFG_GET_PORTS_ACTIVE_IO_RINGS(oct->conf); i++) {
+ if (!oct->oq[i])
+ continue;
+ octep_free_oq(oct->oq[i]);
+ dev_dbg(&oct->pdev->dev,
+ "Successfully freed OQ(RxQ)-%d.\n", i);
+ }
}
diff --git a/drivers/net/ethernet/marvell/octeon_ep/octep_tx.c b/drivers/net/ethernet/marvell/octeon_ep/octep_tx.c
index f0e1cc142b2e..185522d72475 100644
--- a/drivers/net/ethernet/marvell/octeon_ep/octep_tx.c
+++ b/drivers/net/ethernet/marvell/octeon_ep/octep_tx.c
@@ -7,10 +7,75 @@

#include <linux/pci.h>
#include <linux/etherdevice.h>
+#include <linux/vmalloc.h>

#include "octep_config.h"
#include "octep_main.h"

+/* Reset various index of Tx queue data structure. */
+static void octep_iq_reset_indices(struct octep_iq *iq)
+{
+ iq->fill_cnt = 0;
+ iq->host_write_index = 0;
+ iq->octep_read_index = 0;
+ iq->flush_index = 0;
+ iq->pkts_processed = 0;
+ iq->pkt_in_done = 0;
+ atomic_set(&iq->instr_pending, 0);
+}
+
+/**
+ * octep_iq_free_pending() - Free Tx buffers for pending completions.
+ *
+ * @iq: Octeon Tx queue data structure.
+ */
+static void octep_iq_free_pending(struct octep_iq *iq)
+{
+ struct octep_tx_buffer *tx_buffer;
+ struct skb_shared_info *shinfo;
+ u32 fi = iq->flush_index;
+ struct sk_buff *skb;
+ u8 frags, i;
+
+ while (fi != iq->host_write_index) {
+ tx_buffer = iq->buff_info + fi;
+ skb = tx_buffer->skb;
+
+ fi++;
+ if (unlikely(fi == iq->max_count))
+ fi = 0;
+
+ if (!tx_buffer->gather) {
+ dma_unmap_single(iq->dev, tx_buffer->dma,
+ tx_buffer->skb->len, DMA_TO_DEVICE);
+ dev_kfree_skb_any(skb);
+ continue;
+ }
+
+ /* Scatter/Gather */
+ shinfo = skb_shinfo(skb);
+ frags = shinfo->nr_frags;
+
+ dma_unmap_single(iq->dev,
+ tx_buffer->sglist[0].dma_ptr[0],
+ tx_buffer->sglist[0].len[0],
+ DMA_TO_DEVICE);
+
+ i = 1; /* entry 0 is main skb, unmapped above */
+ while (frags--) {
+ dma_unmap_page(iq->dev, tx_buffer->sglist[i >> 2].dma_ptr[i & 3],
+ tx_buffer->sglist[i >> 2].len[i & 3], DMA_TO_DEVICE);
+ i++;
+ }
+
+ dev_kfree_skb_any(skb);
+ }
+
+ atomic_set(&iq->instr_pending, 0);
+ iq->flush_index = fi;
+ netdev_tx_reset_queue(netdev_get_tx_queue(iq->netdev, iq->q_no));
+}
+
/**
* octep_clean_iqs() - Clean Tx queues to shutdown the device.
*
@@ -21,6 +86,133 @@
*/
void octep_clean_iqs(struct octep_device *oct)
{
+ int i;
+
+ for (i = 0; i < oct->num_iqs; i++) {
+ octep_iq_free_pending(oct->iq[i]);
+ octep_iq_reset_indices(oct->iq[i]);
+ }
+}
+
+/**
+ * octep_setup_iq() - Setup a Tx queue.
+ *
+ * @oct: Octeon device private data structure.
+ * @q_no: Tx queue number to be setup.
+ *
+ * Allocate resources for a Tx queue.
+ */
+static int octep_setup_iq(struct octep_device *oct, int q_no)
+{
+ u32 desc_ring_size, buff_info_size, sglist_size;
+ struct octep_iq *iq;
+ int i;
+
+ iq = vzalloc(sizeof(*iq));
+ if (!iq)
+ goto iq_alloc_err;
+ oct->iq[q_no] = iq;
+
+ iq->octep_dev = oct;
+ iq->netdev = oct->netdev;
+ iq->dev = &oct->pdev->dev;
+ iq->q_no = q_no;
+ iq->max_count = CFG_GET_IQ_NUM_DESC(oct->conf);
+ iq->ring_size_mask = iq->max_count - 1;
+ iq->fill_threshold = CFG_GET_IQ_DB_MIN(oct->conf);
+ iq->netdev_q = netdev_get_tx_queue(iq->netdev, q_no);
+
+ /* Allocate memory for hardware queue descriptors */
+ desc_ring_size = OCTEP_IQ_DESC_SIZE * CFG_GET_IQ_NUM_DESC(oct->conf);
+ iq->desc_ring = dma_alloc_coherent(iq->dev, desc_ring_size,
+ &iq->desc_ring_dma, GFP_KERNEL);
+ if (unlikely(!iq->desc_ring)) {
+ dev_err(iq->dev,
+ "Failed to allocate DMA memory for IQ-%d\n", q_no);
+ goto desc_dma_alloc_err;
+ }
+
+ /* Allocate memory for hardware SGLIST descriptors */
+ sglist_size = OCTEP_SGLIST_SIZE_PER_PKT *
+ CFG_GET_IQ_NUM_DESC(oct->conf);
+ iq->sglist = dma_alloc_coherent(iq->dev, sglist_size,
+ &iq->sglist_dma, GFP_KERNEL);
+ if (unlikely(!iq->sglist)) {
+ dev_err(iq->dev,
+ "Failed to allocate DMA memory for IQ-%d SGLIST\n",
+ q_no);
+ goto sglist_alloc_err;
+ }
+
+ /* allocate memory to manage Tx packets pending completion */
+ buff_info_size = OCTEP_IQ_TXBUFF_INFO_SIZE * iq->max_count;
+ iq->buff_info = vzalloc(buff_info_size);
+ if (!iq->buff_info) {
+ dev_err(iq->dev,
+ "Failed to allocate buff info for IQ-%d\n", q_no);
+ goto buff_info_err;
+ }
+
+ /* Setup sglist addresses in tx_buffer entries */
+ for (i = 0; i < CFG_GET_IQ_NUM_DESC(oct->conf); i++) {
+ struct octep_tx_buffer *tx_buffer;
+
+ tx_buffer = &iq->buff_info[i];
+ tx_buffer->sglist =
+ &iq->sglist[i * OCTEP_SGLIST_ENTRIES_PER_PKT];
+ tx_buffer->sglist_dma =
+ iq->sglist_dma + (i * OCTEP_SGLIST_SIZE_PER_PKT);
+ }
+
+ octep_iq_reset_indices(iq);
+ oct->hw_ops.setup_iq_regs(oct, q_no);
+
+ oct->num_iqs++;
+ return 0;
+
+buff_info_err:
+ dma_free_coherent(iq->dev, sglist_size, iq->sglist, iq->sglist_dma);
+sglist_alloc_err:
+ dma_free_coherent(iq->dev, desc_ring_size,
+ iq->desc_ring, iq->desc_ring_dma);
+desc_dma_alloc_err:
+ vfree(iq);
+ oct->iq[q_no] = NULL;
+iq_alloc_err:
+ return -1;
+}
+
+/**
+ * octep_free_iq() - Free Tx queue resources.
+ *
+ * @iq: Octeon Tx queue data structure.
+ *
+ * Free all the resources allocated for a Tx queue.
+ */
+static void octep_free_iq(struct octep_iq *iq)
+{
+ struct octep_device *oct = iq->octep_dev;
+ u64 desc_ring_size, sglist_size;
+ int q_no = iq->q_no;
+
+ desc_ring_size = OCTEP_IQ_DESC_SIZE * CFG_GET_IQ_NUM_DESC(oct->conf);
+
+ if (iq->buff_info)
+ vfree(iq->buff_info);
+
+ if (iq->desc_ring)
+ dma_free_coherent(iq->dev, desc_ring_size,
+ iq->desc_ring, iq->desc_ring_dma);
+
+ sglist_size = OCTEP_SGLIST_SIZE_PER_PKT *
+ CFG_GET_IQ_NUM_DESC(oct->conf);
+ if (iq->sglist)
+ dma_free_coherent(iq->dev, sglist_size,
+ iq->sglist, iq->sglist_dma);
+
+ vfree(iq);
+ oct->iq[q_no] = NULL;
+ oct->num_iqs--;
}

/**
@@ -30,6 +222,25 @@ void octep_clean_iqs(struct octep_device *oct)
*/
int octep_setup_iqs(struct octep_device *oct)
{
+ int i;
+
+ oct->num_iqs = 0;
+ for (i = 0; i < CFG_GET_PORTS_ACTIVE_IO_RINGS(oct->conf); i++) {
+ if (octep_setup_iq(oct, i)) {
+ dev_err(&oct->pdev->dev,
+ "Failed to setup IQ(TxQ)-%d.\n", i);
+ goto iq_setup_err;
+ }
+ dev_dbg(&oct->pdev->dev, "Successfully setup IQ(TxQ)-%d.\n", i);
+ }
+
+ return 0;
+
+iq_setup_err:
+ while (i) {
+ i--;
+ octep_free_iq(oct->iq[i]);
+ }
return -1;
}

@@ -40,4 +251,12 @@ int octep_setup_iqs(struct octep_device *oct)
*/
void octep_free_iqs(struct octep_device *oct)
{
+ int i;
+
+ for (i = 0; i < CFG_GET_PORTS_ACTIVE_IO_RINGS(oct->conf); i++) {
+ octep_free_iq(oct->iq[i]);
+ dev_dbg(&oct->pdev->dev,
+ "Successfully destroyed IQ(TxQ)-%d.\n", i);
+ }
+ oct->num_iqs = 0;
}
--
2.17.1
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