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Message-Id: <20170204182038.3752-5-edumazet@google.com>
Date: Sat, 4 Feb 2017 10:20:33 -0800
From: Eric Dumazet <edumazet@...gle.com>
To: "David S . Miller" <davem@...emloft.net>
Cc: netdev <netdev@...r.kernel.org>,
Eric Dumazet <edumazet@...gle.com>,
Eric Dumazet <eric.dumazet@...il.com>
Subject: [PATCH net-next 4/9] amd8111e: add GRO support
Use napi_complete_done() instead of __napi_complete() to :
1) Get support of gro_flush_timeout if opt-in
2) Not rearm interrupts for busy-polling users.
3) use standard NAPI API.
4) get rid of baroque code and ease maintenance.
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
drivers/net/ethernet/amd/amd8111e.c | 165 ++++++++++++++++--------------------
1 file changed, 73 insertions(+), 92 deletions(-)
diff --git a/drivers/net/ethernet/amd/amd8111e.c b/drivers/net/ethernet/amd/amd8111e.c
index 9595f1bc535b73306720e4d0005fe58d2025..27b18af29863c38c5308c58701bd46c305b2 100644
--- a/drivers/net/ethernet/amd/amd8111e.c
+++ b/drivers/net/ethernet/amd/amd8111e.c
@@ -695,125 +695,106 @@ static int amd8111e_rx_poll(struct napi_struct *napi, int budget)
void __iomem *mmio = lp->mmio;
struct sk_buff *skb,*new_skb;
int min_pkt_len, status;
- unsigned int intr0;
int num_rx_pkt = 0;
short pkt_len;
#if AMD8111E_VLAN_TAG_USED
short vtag;
#endif
- int rx_pkt_limit = budget;
- unsigned long flags;
- if (rx_pkt_limit <= 0)
- goto rx_not_empty;
+ while (num_rx_pkt < budget) {
+ status = le16_to_cpu(lp->rx_ring[rx_index].rx_flags);
+ if (status & OWN_BIT)
+ break;
- do{
- /* process receive packets until we use the quota.
- * If we own the next entry, it's a new packet. Send it up.
+ /* There is a tricky error noted by John Murphy,
+ * <murf@...ftech.com> to Russ Nelson: Even with
+ * full-sized * buffers it's possible for a
+ * jabber packet to use two buffers, with only
+ * the last correctly noting the error.
*/
- while(1) {
- status = le16_to_cpu(lp->rx_ring[rx_index].rx_flags);
- if (status & OWN_BIT)
- break;
-
- /* There is a tricky error noted by John Murphy,
- * <murf@...ftech.com> to Russ Nelson: Even with
- * full-sized * buffers it's possible for a
- * jabber packet to use two buffers, with only
- * the last correctly noting the error.
- */
- if(status & ERR_BIT) {
- /* resetting flags */
- lp->rx_ring[rx_index].rx_flags &= RESET_RX_FLAGS;
- goto err_next_pkt;
- }
- /* check for STP and ENP */
- if(!((status & STP_BIT) && (status & ENP_BIT))){
- /* resetting flags */
- lp->rx_ring[rx_index].rx_flags &= RESET_RX_FLAGS;
- goto err_next_pkt;
- }
- pkt_len = le16_to_cpu(lp->rx_ring[rx_index].msg_count) - 4;
+ if (status & ERR_BIT) {
+ /* resetting flags */
+ lp->rx_ring[rx_index].rx_flags &= RESET_RX_FLAGS;
+ goto err_next_pkt;
+ }
+ /* check for STP and ENP */
+ if (!((status & STP_BIT) && (status & ENP_BIT))){
+ /* resetting flags */
+ lp->rx_ring[rx_index].rx_flags &= RESET_RX_FLAGS;
+ goto err_next_pkt;
+ }
+ pkt_len = le16_to_cpu(lp->rx_ring[rx_index].msg_count) - 4;
#if AMD8111E_VLAN_TAG_USED
- vtag = status & TT_MASK;
- /*MAC will strip vlan tag*/
- if (vtag != 0)
- min_pkt_len =MIN_PKT_LEN - 4;
+ vtag = status & TT_MASK;
+ /* MAC will strip vlan tag */
+ if (vtag != 0)
+ min_pkt_len = MIN_PKT_LEN - 4;
else
#endif
- min_pkt_len =MIN_PKT_LEN;
+ min_pkt_len = MIN_PKT_LEN;
- if (pkt_len < min_pkt_len) {
- lp->rx_ring[rx_index].rx_flags &= RESET_RX_FLAGS;
- lp->drv_rx_errors++;
- goto err_next_pkt;
- }
- if(--rx_pkt_limit < 0)
- goto rx_not_empty;
- new_skb = netdev_alloc_skb(dev, lp->rx_buff_len);
- if (!new_skb) {
- /* if allocation fail,
- * ignore that pkt and go to next one
- */
- lp->rx_ring[rx_index].rx_flags &= RESET_RX_FLAGS;
- lp->drv_rx_errors++;
- goto err_next_pkt;
- }
+ if (pkt_len < min_pkt_len) {
+ lp->rx_ring[rx_index].rx_flags &= RESET_RX_FLAGS;
+ lp->drv_rx_errors++;
+ goto err_next_pkt;
+ }
+ new_skb = netdev_alloc_skb(dev, lp->rx_buff_len);
+ if (!new_skb) {
+ /* if allocation fail,
+ * ignore that pkt and go to next one
+ */
+ lp->rx_ring[rx_index].rx_flags &= RESET_RX_FLAGS;
+ lp->drv_rx_errors++;
+ goto err_next_pkt;
+ }
- skb_reserve(new_skb, 2);
- skb = lp->rx_skbuff[rx_index];
- pci_unmap_single(lp->pci_dev,lp->rx_dma_addr[rx_index],
- lp->rx_buff_len-2, PCI_DMA_FROMDEVICE);
- skb_put(skb, pkt_len);
- lp->rx_skbuff[rx_index] = new_skb;
- lp->rx_dma_addr[rx_index] = pci_map_single(lp->pci_dev,
- new_skb->data,
- lp->rx_buff_len-2,
- PCI_DMA_FROMDEVICE);
+ skb_reserve(new_skb, 2);
+ skb = lp->rx_skbuff[rx_index];
+ pci_unmap_single(lp->pci_dev,lp->rx_dma_addr[rx_index],
+ lp->rx_buff_len-2, PCI_DMA_FROMDEVICE);
+ skb_put(skb, pkt_len);
+ lp->rx_skbuff[rx_index] = new_skb;
+ lp->rx_dma_addr[rx_index] = pci_map_single(lp->pci_dev,
+ new_skb->data,
+ lp->rx_buff_len-2,
+ PCI_DMA_FROMDEVICE);
- skb->protocol = eth_type_trans(skb, dev);
+ skb->protocol = eth_type_trans(skb, dev);
#if AMD8111E_VLAN_TAG_USED
- if (vtag == TT_VLAN_TAGGED){
- u16 vlan_tag = le16_to_cpu(lp->rx_ring[rx_index].tag_ctrl_info);
- __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vlan_tag);
- }
-#endif
- netif_receive_skb(skb);
- /*COAL update rx coalescing parameters*/
- lp->coal_conf.rx_packets++;
- lp->coal_conf.rx_bytes += pkt_len;
- num_rx_pkt++;
-
- err_next_pkt:
- lp->rx_ring[rx_index].buff_phy_addr
- = cpu_to_le32(lp->rx_dma_addr[rx_index]);
- lp->rx_ring[rx_index].buff_count =
- cpu_to_le16(lp->rx_buff_len-2);
- wmb();
- lp->rx_ring[rx_index].rx_flags |= cpu_to_le16(OWN_BIT);
- rx_index = (++lp->rx_idx) & RX_RING_DR_MOD_MASK;
+ if (vtag == TT_VLAN_TAGGED){
+ u16 vlan_tag = le16_to_cpu(lp->rx_ring[rx_index].tag_ctrl_info);
+ __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vlan_tag);
}
- /* Check the interrupt status register for more packets in the
- * mean time. Process them since we have not used up our quota.
- */
- intr0 = readl(mmio + INT0);
- /*Ack receive packets */
- writel(intr0 & RINT0,mmio + INT0);
+#endif
+ napi_gro_receive(napi, skb);
+ /* COAL update rx coalescing parameters */
+ lp->coal_conf.rx_packets++;
+ lp->coal_conf.rx_bytes += pkt_len;
+ num_rx_pkt++;
+
+err_next_pkt:
+ lp->rx_ring[rx_index].buff_phy_addr
+ = cpu_to_le32(lp->rx_dma_addr[rx_index]);
+ lp->rx_ring[rx_index].buff_count =
+ cpu_to_le16(lp->rx_buff_len-2);
+ wmb();
+ lp->rx_ring[rx_index].rx_flags |= cpu_to_le16(OWN_BIT);
+ rx_index = (++lp->rx_idx) & RX_RING_DR_MOD_MASK;
+ }
- } while(intr0 & RINT0);
+ if ((num_rx_pkt < budget) &&
+ napi_complete_done(napi, num_rx_pkt)) {
+ unsigned long flags;
- if (rx_pkt_limit > 0) {
/* Receive descriptor is empty now */
spin_lock_irqsave(&lp->lock, flags);
- __napi_complete(napi);
writel(VAL0|RINTEN0, mmio + INTEN0);
writel(VAL2 | RDMD0, mmio + CMD0);
spin_unlock_irqrestore(&lp->lock, flags);
}
-rx_not_empty:
return num_rx_pkt;
}
--
2.11.0.483.g087da7b7c-goog
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