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Date: Sat, 2 Jan 2010 12:37:43 -0800
From: Ron Mercer <ron.mercer@...gic.com>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org, ron.mercer@...gic.com
Subject: [net-next PATCH 2/3] qlge: Add RX frame handlers for non-split frames.
New handlers are added here to handle:
1) Small frames (<256 bytes) in a single small buffer. Allocate a new
skb and copy the frame.
2) Large frame (>256 bytes) in a page chunk. Allocate an skb, tack it on frags,
post to napi_gro_receive().
Signed-off-by: Ron Mercer <ron.mercer@...gic.com>
---
drivers/net/qlge/qlge_main.c | 261 +++++++++++++++++++++++++++++++++++++++++-
1 files changed, 257 insertions(+), 4 deletions(-)
diff --git a/drivers/net/qlge/qlge_main.c b/drivers/net/qlge/qlge_main.c
index c303478..109bd0a 100644
--- a/drivers/net/qlge/qlge_main.c
+++ b/drivers/net/qlge/qlge_main.c
@@ -1433,6 +1433,209 @@ map_error:
return NETDEV_TX_BUSY;
}
+/* Process an inbound completion from an rx ring. */
+static void ql_process_mac_rx_page(struct ql_adapter *qdev,
+ struct rx_ring *rx_ring,
+ struct ib_mac_iocb_rsp *ib_mac_rsp,
+ u32 length,
+ u16 vlan_id)
+{
+ struct net_device *ndev = qdev->ndev;
+ struct sk_buff *skb = NULL;
+ void *addr;
+ struct bq_desc *lbq_desc = ql_get_curr_lchunk(qdev, rx_ring);
+ struct napi_struct *napi = &rx_ring->napi;
+
+ skb = netdev_alloc_skb(ndev, length);
+ if (!skb) {
+ QPRINTK(qdev, DRV, ERR, "Couldn't get an skb, "
+ "need to unwind!.\n");
+ rx_ring->rx_dropped++;
+ put_page(lbq_desc->p.pg_chunk.page);
+ return;
+ }
+
+ addr = lbq_desc->p.pg_chunk.va;
+ prefetch(addr);
+
+
+ /* Frame error, so drop the packet. */
+ if (ib_mac_rsp->flags2 & IB_MAC_IOCB_RSP_ERR_MASK) {
+ QPRINTK(qdev, DRV, ERR, "Receive error, flags2 = 0x%x\n",
+ ib_mac_rsp->flags2);
+ rx_ring->rx_errors++;
+ goto err_out;
+ }
+
+ /* The max framesize filter on this chip is set higher than
+ * MTU since FCoE uses 2k frames.
+ */
+ if (skb->len > ndev->mtu + ETH_HLEN) {
+ QPRINTK(qdev, DRV, ERR, "Segment too small, dropping.\n");
+ rx_ring->rx_dropped++;
+ goto err_out;
+ }
+ memcpy(skb_put(skb, ETH_HLEN), addr, ETH_HLEN);
+ QPRINTK(qdev, RX_STATUS, DEBUG,
+ "%d bytes of headers and data in large. Chain "
+ "page to new skb and pull tail.\n", length);
+ skb_fill_page_desc(skb, 0, lbq_desc->p.pg_chunk.page,
+ lbq_desc->p.pg_chunk.offset+ETH_HLEN,
+ length-ETH_HLEN);
+ skb->len += length-ETH_HLEN;
+ skb->data_len += length-ETH_HLEN;
+ skb->truesize += length-ETH_HLEN;
+
+ rx_ring->rx_packets++;
+ rx_ring->rx_bytes += skb->len;
+ skb->protocol = eth_type_trans(skb, ndev);
+ skb->ip_summed = CHECKSUM_NONE;
+
+ if (qdev->rx_csum &&
+ !(ib_mac_rsp->flags1 & IB_MAC_CSUM_ERR_MASK)) {
+ /* TCP frame. */
+ if (ib_mac_rsp->flags2 & IB_MAC_IOCB_RSP_T) {
+ QPRINTK(qdev, RX_STATUS, DEBUG,
+ "TCP checksum done!\n");
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+ } else if ((ib_mac_rsp->flags2 & IB_MAC_IOCB_RSP_U) &&
+ (ib_mac_rsp->flags3 & IB_MAC_IOCB_RSP_V4)) {
+ /* Unfragmented ipv4 UDP frame. */
+ struct iphdr *iph = (struct iphdr *) skb->data;
+ if (!(iph->frag_off &
+ cpu_to_be16(IP_MF|IP_OFFSET))) {
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+ QPRINTK(qdev, RX_STATUS, DEBUG,
+ "TCP checksum done!\n");
+ }
+ }
+ }
+
+ skb_record_rx_queue(skb, rx_ring->cq_id);
+ if (skb->ip_summed == CHECKSUM_UNNECESSARY) {
+ if (qdev->vlgrp && (vlan_id != 0xffff))
+ vlan_gro_receive(napi, qdev->vlgrp, vlan_id, skb);
+ else
+ napi_gro_receive(napi, skb);
+ } else {
+ if (qdev->vlgrp && (vlan_id != 0xffff))
+ vlan_hwaccel_receive_skb(skb, qdev->vlgrp, vlan_id);
+ else
+ netif_receive_skb(skb);
+ }
+ return;
+err_out:
+ dev_kfree_skb_any(skb);
+ put_page(lbq_desc->p.pg_chunk.page);
+}
+
+/* Process an inbound completion from an rx ring. */
+static void ql_process_mac_rx_skb(struct ql_adapter *qdev,
+ struct rx_ring *rx_ring,
+ struct ib_mac_iocb_rsp *ib_mac_rsp,
+ u32 length,
+ u16 vlan_id)
+{
+ struct net_device *ndev = qdev->ndev;
+ struct sk_buff *skb = NULL;
+ struct sk_buff *new_skb = NULL;
+ struct bq_desc *sbq_desc = ql_get_curr_sbuf(rx_ring);
+
+ skb = sbq_desc->p.skb;
+ /* Allocate new_skb and copy */
+ new_skb = netdev_alloc_skb(qdev->ndev, length + NET_IP_ALIGN);
+ if (new_skb == NULL) {
+ QPRINTK(qdev, PROBE, ERR,
+ "No skb available, drop the packet.\n");
+ rx_ring->rx_dropped++;
+ return;
+ }
+ skb_reserve(new_skb, NET_IP_ALIGN);
+ memcpy(skb_put(new_skb, length), skb->data, length);
+ skb = new_skb;
+
+ /* Frame error, so drop the packet. */
+ if (ib_mac_rsp->flags2 & IB_MAC_IOCB_RSP_ERR_MASK) {
+ QPRINTK(qdev, DRV, ERR, "Receive error, flags2 = 0x%x\n",
+ ib_mac_rsp->flags2);
+ dev_kfree_skb_any(skb);
+ rx_ring->rx_errors++;
+ return;
+ }
+
+ /* loopback self test for ethtool */
+ if (test_bit(QL_SELFTEST, &qdev->flags)) {
+ ql_check_lb_frame(qdev, skb);
+ dev_kfree_skb_any(skb);
+ return;
+ }
+
+ /* The max framesize filter on this chip is set higher than
+ * MTU since FCoE uses 2k frames.
+ */
+ if (skb->len > ndev->mtu + ETH_HLEN) {
+ dev_kfree_skb_any(skb);
+ rx_ring->rx_dropped++;
+ return;
+ }
+
+ prefetch(skb->data);
+ skb->dev = ndev;
+ if (ib_mac_rsp->flags1 & IB_MAC_IOCB_RSP_M_MASK) {
+ QPRINTK(qdev, RX_STATUS, DEBUG, "%s%s%s Multicast.\n",
+ (ib_mac_rsp->flags1 & IB_MAC_IOCB_RSP_M_MASK) ==
+ IB_MAC_IOCB_RSP_M_HASH ? "Hash" : "",
+ (ib_mac_rsp->flags1 & IB_MAC_IOCB_RSP_M_MASK) ==
+ IB_MAC_IOCB_RSP_M_REG ? "Registered" : "",
+ (ib_mac_rsp->flags1 & IB_MAC_IOCB_RSP_M_MASK) ==
+ IB_MAC_IOCB_RSP_M_PROM ? "Promiscuous" : "");
+ }
+ if (ib_mac_rsp->flags2 & IB_MAC_IOCB_RSP_P)
+ QPRINTK(qdev, RX_STATUS, DEBUG, "Promiscuous Packet.\n");
+
+ rx_ring->rx_packets++;
+ rx_ring->rx_bytes += skb->len;
+ skb->protocol = eth_type_trans(skb, ndev);
+ skb->ip_summed = CHECKSUM_NONE;
+
+ /* If rx checksum is on, and there are no
+ * csum or frame errors.
+ */
+ if (qdev->rx_csum &&
+ !(ib_mac_rsp->flags1 & IB_MAC_CSUM_ERR_MASK)) {
+ /* TCP frame. */
+ if (ib_mac_rsp->flags2 & IB_MAC_IOCB_RSP_T) {
+ QPRINTK(qdev, RX_STATUS, DEBUG,
+ "TCP checksum done!\n");
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+ } else if ((ib_mac_rsp->flags2 & IB_MAC_IOCB_RSP_U) &&
+ (ib_mac_rsp->flags3 & IB_MAC_IOCB_RSP_V4)) {
+ /* Unfragmented ipv4 UDP frame. */
+ struct iphdr *iph = (struct iphdr *) skb->data;
+ if (!(iph->frag_off &
+ cpu_to_be16(IP_MF|IP_OFFSET))) {
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+ QPRINTK(qdev, RX_STATUS, DEBUG,
+ "TCP checksum done!\n");
+ }
+ }
+ }
+
+ skb_record_rx_queue(skb, rx_ring->cq_id);
+ if (skb->ip_summed == CHECKSUM_UNNECESSARY) {
+ if (qdev->vlgrp && (vlan_id != 0xffff))
+ vlan_gro_receive(&rx_ring->napi, qdev->vlgrp,
+ vlan_id, skb);
+ else
+ napi_gro_receive(&rx_ring->napi, skb);
+ } else {
+ if (qdev->vlgrp && (vlan_id != 0xffff))
+ vlan_hwaccel_receive_skb(skb, qdev->vlgrp, vlan_id);
+ else
+ netif_receive_skb(skb);
+ }
+}
+
static void ql_realign_skb(struct sk_buff *skb, int len)
{
void *temp_addr = skb->data;
@@ -1646,14 +1849,13 @@ static struct sk_buff *ql_build_rx_skb(struct ql_adapter *qdev,
}
/* Process an inbound completion from an rx ring. */
-static void ql_process_mac_rx_intr(struct ql_adapter *qdev,
+static void ql_process_mac_split_rx_intr(struct ql_adapter *qdev,
struct rx_ring *rx_ring,
- struct ib_mac_iocb_rsp *ib_mac_rsp)
+ struct ib_mac_iocb_rsp *ib_mac_rsp,
+ u16 vlan_id)
{
struct net_device *ndev = qdev->ndev;
struct sk_buff *skb = NULL;
- u16 vlan_id = (le16_to_cpu(ib_mac_rsp->vlan_id) &
- IB_MAC_IOCB_RSP_VLAN_MASK)
QL_DUMP_IB_MAC_RSP(ib_mac_rsp);
@@ -1753,6 +1955,57 @@ static void ql_process_mac_rx_intr(struct ql_adapter *qdev,
}
}
+/* Process an inbound completion from an rx ring. */
+static unsigned long ql_process_mac_rx_intr(struct ql_adapter *qdev,
+ struct rx_ring *rx_ring,
+ struct ib_mac_iocb_rsp *ib_mac_rsp)
+{
+ u32 length = le32_to_cpu(ib_mac_rsp->data_len);
+ u16 vlan_id = (ib_mac_rsp->flags2 & IB_MAC_IOCB_RSP_V) ?
+ ((le16_to_cpu(ib_mac_rsp->vlan_id) &
+ IB_MAC_IOCB_RSP_VLAN_MASK)) : 0xffff;
+
+ QL_DUMP_IB_MAC_RSP(ib_mac_rsp);
+
+ if (ib_mac_rsp->flags4 & IB_MAC_IOCB_RSP_HV) {
+ /* The data and headers are split into
+ * separate buffers.
+ */
+ ql_process_mac_split_rx_intr(qdev, rx_ring, ib_mac_rsp,
+ vlan_id);
+ } else if (ib_mac_rsp->flags3 & IB_MAC_IOCB_RSP_DS) {
+ /* The data fit in a single small buffer.
+ * Allocate a new skb, copy the data and
+ * return the buffer to the free pool.
+ */
+ ql_process_mac_rx_skb(qdev, rx_ring, ib_mac_rsp,
+ length, vlan_id);
+ } else if (ib_mac_rsp->flags3 & IB_MAC_IOCB_RSP_DL) {
+ /* Non-TCP packet in a page chunk. Allocate an
+ * skb, tack it on frags, and send it up.
+ */
+ ql_process_mac_rx_page(qdev, rx_ring, ib_mac_rsp,
+ length, vlan_id);
+ } else {
+ struct bq_desc *lbq_desc;
+
+ /* Free small buffer that holds the IAL */
+ lbq_desc = ql_get_curr_sbuf(rx_ring);
+ QPRINTK(qdev, RX_ERR, ERR, "Dropping frame, len %d > mtu %d\n",
+ length, qdev->ndev->mtu);
+
+ /* Unwind the large buffers for this frame. */
+ while (length > 0) {
+ lbq_desc = ql_get_curr_lchunk(qdev, rx_ring);
+ length -= (length < rx_ring->lbq_buf_size) ?
+ length : rx_ring->lbq_buf_size;
+ put_page(lbq_desc->p.pg_chunk.page);
+ }
+ }
+
+ return (unsigned long)length;
+}
+
/* Process an outbound completion from an rx ring. */
static void ql_process_mac_tx_intr(struct ql_adapter *qdev,
struct ob_mac_iocb_rsp *mac_rsp)
--
1.6.0.2
--
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