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Date: Wed, 26 Jun 2019 09:24:32 +0000
From: Manish Chopra <manishc@...vell.com>
To: Benjamin Poirier <bpoirier@...e.com>,
GR-Linux-NIC-Dev <GR-Linux-NIC-Dev@...vell.com>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [EXT] [PATCH net-next 03/16] qlge: Deduplicate lbq_buf_size
> -----Original Message-----
> From: Benjamin Poirier <bpoirier@...e.com>
> Sent: Monday, June 17, 2019 1:19 PM
> To: Manish Chopra <manishc@...vell.com>; GR-Linux-NIC-Dev <GR-Linux-
> NIC-Dev@...vell.com>; netdev@...r.kernel.org
> Subject: [EXT] [PATCH net-next 03/16] qlge: Deduplicate lbq_buf_size
>
> External Email
>
> ----------------------------------------------------------------------
> lbq_buf_size is duplicated to every rx_ring structure whereas lbq_buf_order is
> present once in the ql_adapter structure. All rings use the same buf size, keep
> only one copy of it. Also factor out the calculation of lbq_buf_size instead of
> having two copies.
>
> Signed-off-by: Benjamin Poirier <bpoirier@...e.com>
> ---
> drivers/net/ethernet/qlogic/qlge/qlge.h | 2 +-
> drivers/net/ethernet/qlogic/qlge/qlge_dbg.c | 2 +-
> drivers/net/ethernet/qlogic/qlge/qlge_main.c | 61 +++++++++-----------
> 3 files changed, 28 insertions(+), 37 deletions(-)
>
> diff --git a/drivers/net/ethernet/qlogic/qlge/qlge.h
> b/drivers/net/ethernet/qlogic/qlge/qlge.h
> index 0a156a95e981..ba61b4559dd6 100644
> --- a/drivers/net/ethernet/qlogic/qlge/qlge.h
> +++ b/drivers/net/ethernet/qlogic/qlge/qlge.h
> @@ -1433,7 +1433,6 @@ struct rx_ring {
> /* Large buffer queue elements. */
> u32 lbq_len; /* entry count */
> u32 lbq_size; /* size in bytes of queue */
> - u32 lbq_buf_size;
> void *lbq_base;
> dma_addr_t lbq_base_dma;
> void *lbq_base_indirect;
> @@ -2108,6 +2107,7 @@ struct ql_adapter {
> struct rx_ring rx_ring[MAX_RX_RINGS];
> struct tx_ring tx_ring[MAX_TX_RINGS];
> unsigned int lbq_buf_order;
> + u32 lbq_buf_size;
>
> int rx_csum;
> u32 default_rx_queue;
> diff --git a/drivers/net/ethernet/qlogic/qlge/qlge_dbg.c
> b/drivers/net/ethernet/qlogic/qlge/qlge_dbg.c
> index 31389ab8bdf7..46599d74c6fb 100644
> --- a/drivers/net/ethernet/qlogic/qlge/qlge_dbg.c
> +++ b/drivers/net/ethernet/qlogic/qlge/qlge_dbg.c
> @@ -1630,6 +1630,7 @@ void ql_dump_qdev(struct ql_adapter *qdev)
> DUMP_QDEV_FIELD(qdev, "0x%08x", xg_sem_mask);
> DUMP_QDEV_FIELD(qdev, "0x%08x", port_link_up);
> DUMP_QDEV_FIELD(qdev, "0x%08x", port_init);
> + DUMP_QDEV_FIELD(qdev, "%u", lbq_buf_size);
> }
> #endif
>
> @@ -1774,7 +1775,6 @@ void ql_dump_rx_ring(struct rx_ring *rx_ring)
> pr_err("rx_ring->lbq_curr_idx = %d\n", rx_ring->lbq_curr_idx);
> pr_err("rx_ring->lbq_clean_idx = %d\n", rx_ring->lbq_clean_idx);
> pr_err("rx_ring->lbq_free_cnt = %d\n", rx_ring->lbq_free_cnt);
> - pr_err("rx_ring->lbq_buf_size = %d\n", rx_ring->lbq_buf_size);
>
> pr_err("rx_ring->sbq_base = %p\n", rx_ring->sbq_base);
> pr_err("rx_ring->sbq_base_dma = %llx\n", diff --git
> a/drivers/net/ethernet/qlogic/qlge/qlge_main.c
> b/drivers/net/ethernet/qlogic/qlge/qlge_main.c
> index 038a6bfc79c7..9df06ad3fb93 100644
> --- a/drivers/net/ethernet/qlogic/qlge/qlge_main.c
> +++ b/drivers/net/ethernet/qlogic/qlge/qlge_main.c
> @@ -995,15 +995,14 @@ static struct bq_desc *ql_get_curr_lchunk(struct
> ql_adapter *qdev,
> struct bq_desc *lbq_desc = ql_get_curr_lbuf(rx_ring);
>
> pci_dma_sync_single_for_cpu(qdev->pdev,
> - dma_unmap_addr(lbq_desc,
> mapaddr),
> - rx_ring->lbq_buf_size,
> - PCI_DMA_FROMDEVICE);
> + dma_unmap_addr(lbq_desc, mapaddr),
> + qdev->lbq_buf_size,
> PCI_DMA_FROMDEVICE);
>
> /* If it's the last chunk of our master page then
> * we unmap it.
> */
> - if ((lbq_desc->p.pg_chunk.offset + rx_ring->lbq_buf_size)
> - == ql_lbq_block_size(qdev))
> + if (lbq_desc->p.pg_chunk.offset + qdev->lbq_buf_size ==
> + ql_lbq_block_size(qdev))
> pci_unmap_page(qdev->pdev,
> lbq_desc->p.pg_chunk.map,
> ql_lbq_block_size(qdev),
> @@ -1074,11 +1073,11 @@ static int ql_get_next_chunk(struct ql_adapter
> *qdev, struct rx_ring *rx_ring,
> /* Adjust the master page chunk for next
> * buffer get.
> */
> - rx_ring->pg_chunk.offset += rx_ring->lbq_buf_size;
> + rx_ring->pg_chunk.offset += qdev->lbq_buf_size;
> if (rx_ring->pg_chunk.offset == ql_lbq_block_size(qdev)) {
> rx_ring->pg_chunk.page = NULL;
> } else {
> - rx_ring->pg_chunk.va += rx_ring->lbq_buf_size;
> + rx_ring->pg_chunk.va += qdev->lbq_buf_size;
> get_page(rx_ring->pg_chunk.page);
> }
> return 0;
> @@ -1110,12 +1109,12 @@ static void ql_update_lbq(struct ql_adapter
> *qdev, struct rx_ring *rx_ring)
> lbq_desc->p.pg_chunk.offset;
> dma_unmap_addr_set(lbq_desc, mapaddr, map);
> dma_unmap_len_set(lbq_desc, maplen,
> - rx_ring->lbq_buf_size);
> + qdev->lbq_buf_size);
> *lbq_desc->addr = cpu_to_le64(map);
>
> pci_dma_sync_single_for_device(qdev->pdev, map,
> - rx_ring->lbq_buf_size,
> - PCI_DMA_FROMDEVICE);
> + qdev->lbq_buf_size,
> + PCI_DMA_FROMDEVICE);
> clean_idx++;
> if (clean_idx == rx_ring->lbq_len)
> clean_idx = 0;
> @@ -1880,8 +1879,7 @@ static struct sk_buff *ql_build_rx_skb(struct
> ql_adapter *qdev,
> }
> do {
> lbq_desc = ql_get_curr_lchunk(qdev, rx_ring);
> - size = (length < rx_ring->lbq_buf_size) ? length :
> - rx_ring->lbq_buf_size;
> + size = min(length, qdev->lbq_buf_size);
>
> netif_printk(qdev, rx_status, KERN_DEBUG, qdev-
> >ndev,
> "Adding page %d to skb for %d bytes.\n",
> @@ -2776,12 +2774,12 @@ static int ql_alloc_tx_resources(struct ql_adapter
> *qdev,
>
> static void ql_free_lbq_buffers(struct ql_adapter *qdev, struct rx_ring
> *rx_ring) {
> - unsigned int last_offset = ql_lbq_block_size(qdev) -
> - rx_ring->lbq_buf_size;
> + unsigned int last_offset;
> struct bq_desc *lbq_desc;
>
> uint32_t curr_idx, clean_idx;
>
> + last_offset = ql_lbq_block_size(qdev) - qdev->lbq_buf_size;
> curr_idx = rx_ring->lbq_curr_idx;
> clean_idx = rx_ring->lbq_clean_idx;
> while (curr_idx != clean_idx) {
> @@ -3149,8 +3147,8 @@ static int ql_start_rx_ring(struct ql_adapter *qdev,
> struct rx_ring *rx_ring)
> } while (page_entries < MAX_DB_PAGES_PER_BQ(rx_ring-
> >lbq_len));
> cqicb->lbq_addr =
> cpu_to_le64(rx_ring->lbq_base_indirect_dma);
> - bq_len = (rx_ring->lbq_buf_size == 65536) ? 0 :
> - (u16) rx_ring->lbq_buf_size;
> + bq_len = (qdev->lbq_buf_size == 65536) ? 0 :
> + (u16)qdev->lbq_buf_size;
> cqicb->lbq_buf_size = cpu_to_le16(bq_len);
> bq_len = (rx_ring->lbq_len == 65536) ? 0 :
> (u16) rx_ring->lbq_len;
> @@ -4048,16 +4046,21 @@ static int qlge_close(struct net_device *ndev)
> return 0;
> }
>
> +static void qlge_set_lb_size(struct ql_adapter *qdev) {
> + if (qdev->ndev->mtu <= 1500)
> + qdev->lbq_buf_size = LARGE_BUFFER_MIN_SIZE;
> + else
> + qdev->lbq_buf_size = LARGE_BUFFER_MAX_SIZE;
> + qdev->lbq_buf_order = get_order(qdev->lbq_buf_size); }
> +
> static int ql_configure_rings(struct ql_adapter *qdev) {
> int i;
> struct rx_ring *rx_ring;
> struct tx_ring *tx_ring;
> int cpu_cnt = min(MAX_CPUS, (int)num_online_cpus());
> - unsigned int lbq_buf_len = (qdev->ndev->mtu > 1500) ?
> - LARGE_BUFFER_MAX_SIZE : LARGE_BUFFER_MIN_SIZE;
> -
> - qdev->lbq_buf_order = get_order(lbq_buf_len);
>
> /* In a perfect world we have one RSS ring for each CPU
> * and each has it's own vector. To do that we ask for @@ -4105,7
> +4108,6 @@ static int ql_configure_rings(struct ql_adapter *qdev)
> rx_ring->lbq_len = NUM_LARGE_BUFFERS;
> rx_ring->lbq_size =
> rx_ring->lbq_len * sizeof(__le64);
> - rx_ring->lbq_buf_size = (u16)lbq_buf_len;
> rx_ring->sbq_len = NUM_SMALL_BUFFERS;
> rx_ring->sbq_size =
> rx_ring->sbq_len * sizeof(__le64); @@ -4121,7
> +4123,6 @@ static int ql_configure_rings(struct ql_adapter *qdev)
> rx_ring->cq_len * sizeof(struct ql_net_rsp_iocb);
> rx_ring->lbq_len = 0;
> rx_ring->lbq_size = 0;
> - rx_ring->lbq_buf_size = 0;
> rx_ring->sbq_len = 0;
> rx_ring->sbq_size = 0;
> rx_ring->sbq_buf_size = 0;
> @@ -4140,6 +4141,7 @@ static int qlge_open(struct net_device *ndev)
> if (err)
> return err;
>
> + qlge_set_lb_size(qdev);
> err = ql_configure_rings(qdev);
> if (err)
> return err;
> @@ -4161,9 +4163,7 @@ static int qlge_open(struct net_device *ndev)
>
> static int ql_change_rx_buffers(struct ql_adapter *qdev) {
> - struct rx_ring *rx_ring;
> - int i, status;
> - u32 lbq_buf_len;
> + int status;
>
> /* Wait for an outstanding reset to complete. */
> if (!test_bit(QL_ADAPTER_UP, &qdev->flags)) { @@ -4186,16 +4186,7
> @@ static int ql_change_rx_buffers(struct ql_adapter *qdev)
> if (status)
> goto error;
>
> - /* Get the new rx buffer size. */
> - lbq_buf_len = (qdev->ndev->mtu > 1500) ?
> - LARGE_BUFFER_MAX_SIZE : LARGE_BUFFER_MIN_SIZE;
> - qdev->lbq_buf_order = get_order(lbq_buf_len);
> -
> - for (i = 0; i < qdev->rss_ring_count; i++) {
> - rx_ring = &qdev->rx_ring[i];
> - /* Set the new size. */
> - rx_ring->lbq_buf_size = lbq_buf_len;
> - }
> + qlge_set_lb_size(qdev);
>
> status = ql_adapter_up(qdev);
> if (status)
> --
> 2.21.0
Not sure if this change is really required, I think fields relevant to rx_ring should be present in the rx_ring structure.
There are various other fields like "lbq_len" and "lbq_size" which would be same for all rx rings but still under the relevant rx_ring structure.
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