kernel: merge upstream bgmac driver improvements
Signed-off-by: Felix Fietkau <nbd@openwrt.org> SVN-Revision: 44978
This commit is contained in:
Felix Fietkau
parent
68ca1f285c
commit
fafa3f57e3
3 changed files with 480 additions and 0 deletions
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@ -0,0 +1,24 @@
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From: Felix Fietkau <nbd@openwrt.org>
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Date: Mon, 23 Mar 2015 02:40:06 +0100
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Subject: [PATCH] bgmac: fix descriptor frame start/end definitions
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The start-of-frame and end-of-frame bits were accidentally swapped.
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In the current code it does not make any difference, since they are
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always used together.
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Signed-off-by: Felix Fietkau <nbd@openwrt.org>
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---
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--- a/drivers/net/ethernet/broadcom/bgmac.h
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+++ b/drivers/net/ethernet/broadcom/bgmac.h
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@@ -345,8 +345,8 @@
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#define BGMAC_DESC_CTL0_EOT 0x10000000 /* End of ring */
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#define BGMAC_DESC_CTL0_IOC 0x20000000 /* IRQ on complete */
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-#define BGMAC_DESC_CTL0_SOF 0x40000000 /* Start of frame */
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-#define BGMAC_DESC_CTL0_EOF 0x80000000 /* End of frame */
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+#define BGMAC_DESC_CTL0_EOF 0x40000000 /* End of frame */
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+#define BGMAC_DESC_CTL0_SOF 0x80000000 /* Start of frame */
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#define BGMAC_DESC_CTL1_LEN 0x00001FFF
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#define BGMAC_PHY_NOREGS 0x1E
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@ -0,0 +1,189 @@
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From: Felix Fietkau <nbd@openwrt.org>
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Date: Mon, 23 Mar 2015 02:41:25 +0100
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Subject: [PATCH] bgmac: implement GRO and use build_skb
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This improves performance for routing and local rx
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Signed-off-by: Felix Fietkau <nbd@openwrt.org>
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---
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--- a/drivers/net/ethernet/broadcom/bgmac.c
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+++ b/drivers/net/ethernet/broadcom/bgmac.c
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@@ -276,31 +276,31 @@ static int bgmac_dma_rx_skb_for_slot(str
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struct bgmac_slot_info *slot)
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{
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struct device *dma_dev = bgmac->core->dma_dev;
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- struct sk_buff *skb;
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dma_addr_t dma_addr;
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struct bgmac_rx_header *rx;
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+ void *buf;
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/* Alloc skb */
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- skb = netdev_alloc_skb(bgmac->net_dev, BGMAC_RX_BUF_SIZE);
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- if (!skb)
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+ buf = netdev_alloc_frag(BGMAC_RX_ALLOC_SIZE);
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+ if (!buf)
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return -ENOMEM;
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/* Poison - if everything goes fine, hardware will overwrite it */
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- rx = (struct bgmac_rx_header *)skb->data;
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+ rx = buf;
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rx->len = cpu_to_le16(0xdead);
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rx->flags = cpu_to_le16(0xbeef);
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/* Map skb for the DMA */
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- dma_addr = dma_map_single(dma_dev, skb->data,
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- BGMAC_RX_BUF_SIZE, DMA_FROM_DEVICE);
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+ dma_addr = dma_map_single(dma_dev, buf, BGMAC_RX_BUF_SIZE,
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+ DMA_FROM_DEVICE);
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if (dma_mapping_error(dma_dev, dma_addr)) {
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bgmac_err(bgmac, "DMA mapping error\n");
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- dev_kfree_skb(skb);
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+ put_page(virt_to_head_page(buf));
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return -ENOMEM;
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}
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/* Update the slot */
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- slot->skb = skb;
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+ slot->buf = buf;
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slot->dma_addr = dma_addr;
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return 0;
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@@ -343,8 +343,9 @@ static int bgmac_dma_rx_read(struct bgma
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while (ring->start != ring->end) {
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struct device *dma_dev = bgmac->core->dma_dev;
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struct bgmac_slot_info *slot = &ring->slots[ring->start];
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- struct sk_buff *skb = slot->skb;
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- struct bgmac_rx_header *rx;
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+ struct bgmac_rx_header *rx = slot->buf;
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+ struct sk_buff *skb;
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+ void *buf = slot->buf;
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u16 len, flags;
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/* Unmap buffer to make it accessible to the CPU */
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@@ -352,7 +353,6 @@ static int bgmac_dma_rx_read(struct bgma
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BGMAC_RX_BUF_SIZE, DMA_FROM_DEVICE);
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/* Get info from the header */
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- rx = (struct bgmac_rx_header *)skb->data;
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len = le16_to_cpu(rx->len);
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flags = le16_to_cpu(rx->flags);
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@@ -393,12 +393,13 @@ static int bgmac_dma_rx_read(struct bgma
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dma_unmap_single(dma_dev, old_dma_addr,
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BGMAC_RX_BUF_SIZE, DMA_FROM_DEVICE);
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+ skb = build_skb(buf, BGMAC_RX_ALLOC_SIZE);
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skb_put(skb, BGMAC_RX_FRAME_OFFSET + len);
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skb_pull(skb, BGMAC_RX_FRAME_OFFSET);
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skb_checksum_none_assert(skb);
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skb->protocol = eth_type_trans(skb, bgmac->net_dev);
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- netif_receive_skb(skb);
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+ napi_gro_receive(&bgmac->napi, skb);
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handled++;
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} while (0);
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@@ -434,12 +435,11 @@ static bool bgmac_dma_unaligned(struct b
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return false;
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}
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-static void bgmac_dma_ring_free(struct bgmac *bgmac,
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- struct bgmac_dma_ring *ring)
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+static void bgmac_dma_tx_ring_free(struct bgmac *bgmac,
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+ struct bgmac_dma_ring *ring)
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{
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struct device *dma_dev = bgmac->core->dma_dev;
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struct bgmac_slot_info *slot;
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- int size;
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int i;
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for (i = 0; i < ring->num_slots; i++) {
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@@ -451,23 +451,55 @@ static void bgmac_dma_ring_free(struct b
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dev_kfree_skb(slot->skb);
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}
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}
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+}
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- if (ring->cpu_base) {
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- /* Free ring of descriptors */
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- size = ring->num_slots * sizeof(struct bgmac_dma_desc);
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- dma_free_coherent(dma_dev, size, ring->cpu_base,
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- ring->dma_base);
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+static void bgmac_dma_rx_ring_free(struct bgmac *bgmac,
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+ struct bgmac_dma_ring *ring)
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+{
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+ struct device *dma_dev = bgmac->core->dma_dev;
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+ struct bgmac_slot_info *slot;
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+ int i;
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+
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+ for (i = 0; i < ring->num_slots; i++) {
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+ slot = &ring->slots[i];
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+ if (!slot->buf)
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+ continue;
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+
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+ if (slot->dma_addr)
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+ dma_unmap_single(dma_dev, slot->dma_addr,
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+ BGMAC_RX_BUF_SIZE,
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+ DMA_FROM_DEVICE);
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+ put_page(virt_to_head_page(slot->buf));
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}
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}
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+static void bgmac_dma_ring_desc_free(struct bgmac *bgmac,
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+ struct bgmac_dma_ring *ring)
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+{
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+ struct device *dma_dev = bgmac->core->dma_dev;
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+ int size;
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+
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+ if (!ring->cpu_base)
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+ return;
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+
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+ /* Free ring of descriptors */
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+ size = ring->num_slots * sizeof(struct bgmac_dma_desc);
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+ dma_free_coherent(dma_dev, size, ring->cpu_base,
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+ ring->dma_base);
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+}
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+
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static void bgmac_dma_free(struct bgmac *bgmac)
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{
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int i;
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- for (i = 0; i < BGMAC_MAX_TX_RINGS; i++)
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- bgmac_dma_ring_free(bgmac, &bgmac->tx_ring[i]);
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- for (i = 0; i < BGMAC_MAX_RX_RINGS; i++)
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- bgmac_dma_ring_free(bgmac, &bgmac->rx_ring[i]);
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+ for (i = 0; i < BGMAC_MAX_TX_RINGS; i++) {
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+ bgmac_dma_tx_ring_free(bgmac, &bgmac->tx_ring[i]);
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+ bgmac_dma_ring_desc_free(bgmac, &bgmac->tx_ring[i]);
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+ }
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+ for (i = 0; i < BGMAC_MAX_RX_RINGS; i++) {
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+ bgmac_dma_rx_ring_free(bgmac, &bgmac->rx_ring[i]);
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+ bgmac_dma_ring_desc_free(bgmac, &bgmac->rx_ring[i]);
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+ }
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}
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static int bgmac_dma_alloc(struct bgmac *bgmac)
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--- a/drivers/net/ethernet/broadcom/bgmac.h
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+++ b/drivers/net/ethernet/broadcom/bgmac.h
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@@ -362,6 +362,8 @@
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#define BGMAC_RX_FRAME_OFFSET 30 /* There are 2 unused bytes between header and real data */
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#define BGMAC_RX_MAX_FRAME_SIZE 1536 /* Copied from b44/tg3 */
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#define BGMAC_RX_BUF_SIZE (BGMAC_RX_FRAME_OFFSET + BGMAC_RX_MAX_FRAME_SIZE)
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+#define BGMAC_RX_ALLOC_SIZE (SKB_DATA_ALIGN(BGMAC_RX_BUF_SIZE) + \
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+ SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))
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#define BGMAC_BFL_ENETROBO 0x0010 /* has ephy roboswitch spi */
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#define BGMAC_BFL_ENETADM 0x0080 /* has ADMtek switch */
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@@ -383,7 +385,10 @@
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#define ETHER_MAX_LEN 1518
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struct bgmac_slot_info {
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- struct sk_buff *skb;
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+ union {
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+ struct sk_buff *skb;
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+ void *buf;
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+ };
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dma_addr_t dma_addr;
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};
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@ -0,0 +1,267 @@
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From: Felix Fietkau <nbd@openwrt.org>
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Date: Mon, 23 Mar 2015 02:42:26 +0100
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Subject: [PATCH] bgmac: implement scatter/gather support
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Always use software checksumming, since the hardware does not have any
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checksum offload support.
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This significantly improves local TCP tx performance.
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Signed-off-by: Felix Fietkau <nbd@openwrt.org>
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---
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--- a/drivers/net/ethernet/broadcom/bgmac.c
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+++ b/drivers/net/ethernet/broadcom/bgmac.c
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@@ -115,53 +115,91 @@ static void bgmac_dma_tx_enable(struct b
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bgmac_write(bgmac, ring->mmio_base + BGMAC_DMA_TX_CTL, ctl);
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}
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+static void
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+bgmac_dma_tx_add_buf(struct bgmac *bgmac, struct bgmac_dma_ring *ring,
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+ int i, int len, u32 ctl0)
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+{
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+ struct bgmac_slot_info *slot;
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+ struct bgmac_dma_desc *dma_desc;
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+ u32 ctl1;
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+
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+ if (i == ring->num_slots - 1)
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+ ctl0 |= BGMAC_DESC_CTL0_EOT;
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+
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+ ctl1 = len & BGMAC_DESC_CTL1_LEN;
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+
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+ slot = &ring->slots[i];
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+ dma_desc = &ring->cpu_base[i];
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+ dma_desc->addr_low = cpu_to_le32(lower_32_bits(slot->dma_addr));
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+ dma_desc->addr_high = cpu_to_le32(upper_32_bits(slot->dma_addr));
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+ dma_desc->ctl0 = cpu_to_le32(ctl0);
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+ dma_desc->ctl1 = cpu_to_le32(ctl1);
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+}
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+
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static netdev_tx_t bgmac_dma_tx_add(struct bgmac *bgmac,
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struct bgmac_dma_ring *ring,
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struct sk_buff *skb)
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{
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struct device *dma_dev = bgmac->core->dma_dev;
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struct net_device *net_dev = bgmac->net_dev;
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- struct bgmac_dma_desc *dma_desc;
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- struct bgmac_slot_info *slot;
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- u32 ctl0, ctl1;
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+ struct bgmac_slot_info *slot = &ring->slots[ring->end];
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int free_slots;
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+ int nr_frags;
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+ u32 flags;
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+ int index = ring->end;
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+ int i;
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if (skb->len > BGMAC_DESC_CTL1_LEN) {
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bgmac_err(bgmac, "Too long skb (%d)\n", skb->len);
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- goto err_stop_drop;
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+ goto err_drop;
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}
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+ if (skb->ip_summed == CHECKSUM_PARTIAL)
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+ skb_checksum_help(skb);
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+
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+ nr_frags = skb_shinfo(skb)->nr_frags;
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+
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if (ring->start <= ring->end)
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free_slots = ring->start - ring->end + BGMAC_TX_RING_SLOTS;
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else
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free_slots = ring->start - ring->end;
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- if (free_slots == 1) {
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+
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+ if (free_slots <= nr_frags + 1) {
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bgmac_err(bgmac, "TX ring is full, queue should be stopped!\n");
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netif_stop_queue(net_dev);
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return NETDEV_TX_BUSY;
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}
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- slot = &ring->slots[ring->end];
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- slot->skb = skb;
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- slot->dma_addr = dma_map_single(dma_dev, skb->data, skb->len,
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+ slot->dma_addr = dma_map_single(dma_dev, skb->data, skb_headlen(skb),
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DMA_TO_DEVICE);
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- if (dma_mapping_error(dma_dev, slot->dma_addr)) {
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- bgmac_err(bgmac, "Mapping error of skb on ring 0x%X\n",
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- ring->mmio_base);
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- goto err_stop_drop;
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- }
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+ if (unlikely(dma_mapping_error(dma_dev, slot->dma_addr)))
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+ goto err_dma_head;
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- ctl0 = BGMAC_DESC_CTL0_IOC | BGMAC_DESC_CTL0_SOF | BGMAC_DESC_CTL0_EOF;
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- if (ring->end == ring->num_slots - 1)
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- ctl0 |= BGMAC_DESC_CTL0_EOT;
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- ctl1 = skb->len & BGMAC_DESC_CTL1_LEN;
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+ flags = BGMAC_DESC_CTL0_SOF;
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+ if (!nr_frags)
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+ flags |= BGMAC_DESC_CTL0_EOF | BGMAC_DESC_CTL0_IOC;
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+
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+ bgmac_dma_tx_add_buf(bgmac, ring, index, skb_headlen(skb), flags);
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+ flags = 0;
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+
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+ for (i = 0; i < nr_frags; i++) {
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+ struct skb_frag_struct *frag = &skb_shinfo(skb)->frags[i];
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+ int len = skb_frag_size(frag);
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+
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+ index = (index + 1) % BGMAC_TX_RING_SLOTS;
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+ slot = &ring->slots[index];
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+ slot->dma_addr = skb_frag_dma_map(dma_dev, frag, 0,
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+ len, DMA_TO_DEVICE);
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+ if (unlikely(dma_mapping_error(dma_dev, slot->dma_addr)))
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+ goto err_dma;
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- dma_desc = ring->cpu_base;
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- dma_desc += ring->end;
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- dma_desc->addr_low = cpu_to_le32(lower_32_bits(slot->dma_addr));
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- dma_desc->addr_high = cpu_to_le32(upper_32_bits(slot->dma_addr));
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- dma_desc->ctl0 = cpu_to_le32(ctl0);
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||||||
|
- dma_desc->ctl1 = cpu_to_le32(ctl1);
|
||||||
|
+ if (i == nr_frags - 1)
|
||||||
|
+ flags |= BGMAC_DESC_CTL0_EOF | BGMAC_DESC_CTL0_IOC;
|
||||||
|
+
|
||||||
|
+ bgmac_dma_tx_add_buf(bgmac, ring, index, len, flags);
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ slot->skb = skb;
|
||||||
|
|
||||||
|
netdev_sent_queue(net_dev, skb->len);
|
||||||
|
|
||||||
|
@@ -170,20 +208,35 @@ static netdev_tx_t bgmac_dma_tx_add(stru
|
||||||
|
/* Increase ring->end to point empty slot. We tell hardware the first
|
||||||
|
* slot it should *not* read.
|
||||||
|
*/
|
||||||
|
- if (++ring->end >= BGMAC_TX_RING_SLOTS)
|
||||||
|
- ring->end = 0;
|
||||||
|
+ ring->end = (index + 1) % BGMAC_TX_RING_SLOTS;
|
||||||
|
bgmac_write(bgmac, ring->mmio_base + BGMAC_DMA_TX_INDEX,
|
||||||
|
ring->index_base +
|
||||||
|
ring->end * sizeof(struct bgmac_dma_desc));
|
||||||
|
|
||||||
|
- /* Always keep one slot free to allow detecting bugged calls. */
|
||||||
|
- if (--free_slots == 1)
|
||||||
|
+ free_slots -= nr_frags + 1;
|
||||||
|
+ if (free_slots < 8)
|
||||||
|
netif_stop_queue(net_dev);
|
||||||
|
|
||||||
|
return NETDEV_TX_OK;
|
||||||
|
|
||||||
|
-err_stop_drop:
|
||||||
|
- netif_stop_queue(net_dev);
|
||||||
|
+err_dma:
|
||||||
|
+ dma_unmap_single(dma_dev, slot->dma_addr, skb_headlen(skb),
|
||||||
|
+ DMA_TO_DEVICE);
|
||||||
|
+
|
||||||
|
+ while (i > 0) {
|
||||||
|
+ int index = (ring->end + i) % BGMAC_TX_RING_SLOTS;
|
||||||
|
+ struct bgmac_slot_info *slot = &ring->slots[index];
|
||||||
|
+ u32 ctl1 = le32_to_cpu(ring->cpu_base[index].ctl1);
|
||||||
|
+ int len = ctl1 & BGMAC_DESC_CTL1_LEN;
|
||||||
|
+
|
||||||
|
+ dma_unmap_page(dma_dev, slot->dma_addr, len, DMA_TO_DEVICE);
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+err_dma_head:
|
||||||
|
+ bgmac_err(bgmac, "Mapping error of skb on ring 0x%X\n",
|
||||||
|
+ ring->mmio_base);
|
||||||
|
+
|
||||||
|
+err_drop:
|
||||||
|
dev_kfree_skb(skb);
|
||||||
|
return NETDEV_TX_OK;
|
||||||
|
}
|
||||||
|
@@ -205,32 +258,45 @@ static void bgmac_dma_tx_free(struct bgm
|
||||||
|
|
||||||
|
while (ring->start != empty_slot) {
|
||||||
|
struct bgmac_slot_info *slot = &ring->slots[ring->start];
|
||||||
|
+ u32 ctl1 = le32_to_cpu(ring->cpu_base[ring->start].ctl1);
|
||||||
|
+ int len = ctl1 & BGMAC_DESC_CTL1_LEN;
|
||||||
|
|
||||||
|
- if (slot->skb) {
|
||||||
|
+ if (!slot->dma_addr) {
|
||||||
|
+ bgmac_err(bgmac, "Hardware reported transmission for empty TX ring slot %d! End of ring: %d\n",
|
||||||
|
+ ring->start, ring->end);
|
||||||
|
+ goto next;
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ if (ctl1 & BGMAC_DESC_CTL0_SOF)
|
||||||
|
/* Unmap no longer used buffer */
|
||||||
|
- dma_unmap_single(dma_dev, slot->dma_addr,
|
||||||
|
- slot->skb->len, DMA_TO_DEVICE);
|
||||||
|
- slot->dma_addr = 0;
|
||||||
|
+ dma_unmap_single(dma_dev, slot->dma_addr, len,
|
||||||
|
+ DMA_TO_DEVICE);
|
||||||
|
+ else
|
||||||
|
+ dma_unmap_page(dma_dev, slot->dma_addr, len,
|
||||||
|
+ DMA_TO_DEVICE);
|
||||||
|
|
||||||
|
+ if (slot->skb) {
|
||||||
|
bytes_compl += slot->skb->len;
|
||||||
|
pkts_compl++;
|
||||||
|
|
||||||
|
/* Free memory! :) */
|
||||||
|
dev_kfree_skb(slot->skb);
|
||||||
|
slot->skb = NULL;
|
||||||
|
- } else {
|
||||||
|
- bgmac_err(bgmac, "Hardware reported transmission for empty TX ring slot %d! End of ring: %d\n",
|
||||||
|
- ring->start, ring->end);
|
||||||
|
}
|
||||||
|
|
||||||
|
+next:
|
||||||
|
+ slot->dma_addr = 0;
|
||||||
|
if (++ring->start >= BGMAC_TX_RING_SLOTS)
|
||||||
|
ring->start = 0;
|
||||||
|
freed = true;
|
||||||
|
}
|
||||||
|
|
||||||
|
+ if (!pkts_compl)
|
||||||
|
+ return;
|
||||||
|
+
|
||||||
|
netdev_completed_queue(bgmac->net_dev, pkts_compl, bytes_compl);
|
||||||
|
|
||||||
|
- if (freed && netif_queue_stopped(bgmac->net_dev))
|
||||||
|
+ if (netif_queue_stopped(bgmac->net_dev))
|
||||||
|
netif_wake_queue(bgmac->net_dev);
|
||||||
|
}
|
||||||
|
|
||||||
|
@@ -439,17 +505,25 @@ static void bgmac_dma_tx_ring_free(struc
|
||||||
|
struct bgmac_dma_ring *ring)
|
||||||
|
{
|
||||||
|
struct device *dma_dev = bgmac->core->dma_dev;
|
||||||
|
+ struct bgmac_dma_desc *dma_desc = ring->cpu_base;
|
||||||
|
struct bgmac_slot_info *slot;
|
||||||
|
int i;
|
||||||
|
|
||||||
|
for (i = 0; i < ring->num_slots; i++) {
|
||||||
|
+ int len = dma_desc[i].ctl1 & BGMAC_DESC_CTL1_LEN;
|
||||||
|
+
|
||||||
|
slot = &ring->slots[i];
|
||||||
|
- if (slot->skb) {
|
||||||
|
- if (slot->dma_addr)
|
||||||
|
- dma_unmap_single(dma_dev, slot->dma_addr,
|
||||||
|
- slot->skb->len, DMA_TO_DEVICE);
|
||||||
|
- dev_kfree_skb(slot->skb);
|
||||||
|
- }
|
||||||
|
+ dev_kfree_skb(slot->skb);
|
||||||
|
+
|
||||||
|
+ if (!slot->dma_addr)
|
||||||
|
+ continue;
|
||||||
|
+
|
||||||
|
+ if (slot->skb)
|
||||||
|
+ dma_unmap_single(dma_dev, slot->dma_addr,
|
||||||
|
+ len, DMA_TO_DEVICE);
|
||||||
|
+ else
|
||||||
|
+ dma_unmap_page(dma_dev, slot->dma_addr,
|
||||||
|
+ len, DMA_TO_DEVICE);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
@@ -1583,6 +1657,10 @@ static int bgmac_probe(struct bcma_devic
|
||||||
|
goto err_dma_free;
|
||||||
|
}
|
||||||
|
|
||||||
|
+ net_dev->features = NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
|
||||||
|
+ net_dev->hw_features = net_dev->features;
|
||||||
|
+ net_dev->vlan_features = net_dev->features;
|
||||||
|
+
|
||||||
|
err = register_netdev(bgmac->net_dev);
|
||||||
|
if (err) {
|
||||||
|
bgmac_err(bgmac, "Cannot register net device\n");
|
||||||
Loading…
Reference in a new issue