This patch adds support for iscsiuio interface using Light L2 (LL2) qed
interface.
Signed-off-by: Nilesh Javali <nilesh.jav...@cavium.com>
Signed-off-by: Adheer Chandravanshi <adheer.chandravan...@qlogic.com>
Signed-off-by: Chad Dupuis <chad.dup...@cavium.com>
Signed-off-by: Saurav Kashyap <saurav.kash...@cavium.com>
Signed-off-by: Arun Easi <arun.e...@cavium.com>
Signed-off-by: Manish Rangankar <manish.rangan...@cavium.com>
---
drivers/scsi/qedi/qedi.h | 73 +++++++++
drivers/scsi/qedi/qedi_main.c | 357 ++++++++++++++++++++++++++++++++++++++++++
2 files changed, 430 insertions(+)
diff --git a/drivers/scsi/qedi/qedi.h b/drivers/scsi/qedi/qedi.h
index 92136a3..e00c141 100644
--- a/drivers/scsi/qedi/qedi.h
+++ b/drivers/scsi/qedi/qedi.h
@@ -21,6 +21,7 @@
#include <linux/qed/qed_if.h>
#include "qedi_dbg.h"
#include <linux/qed/qed_iscsi_if.h>
+#include <linux/qed/qed_ll2_if.h>
#include "qedi_version.h"
#define QEDI_MODULE_NAME "qedi"
@@ -54,6 +55,78 @@
#define QEDI_LOCAL_PORT_MAX 61024
#define QEDI_LOCAL_PORT_RANGE (QEDI_LOCAL_PORT_MAX - QEDI_LOCAL_PORT_MIN)
#define QEDI_LOCAL_PORT_INVALID 0xffff
+#define TX_RX_RING 16
+#define RX_RING (TX_RX_RING - 1)
+#define LL2_SINGLE_BUF_SIZE 0x400
+#define QEDI_PAGE_SIZE 4096
+#define QEDI_PAGE_ALIGN(addr) ALIGN(addr, QEDI_PAGE_SIZE)
+#define QEDI_PAGE_MASK (~((QEDI_PAGE_SIZE) - 1))
+
+#define QEDI_PAGE_SIZE 4096
+#define QEDI_PATH_HANDLE 0xFE0000000UL
+
+struct qedi_uio_ctrl {
+ /* meta data */
+ u32 uio_hsi_version;
+
+ /* user writes */
+ u32 host_tx_prod;
+ u32 host_rx_cons;
+ u32 host_rx_bd_cons;
+ u32 host_tx_pkt_len;
+ u32 host_rx_cons_cnt;
+
+ /* driver writes */
+ u32 hw_tx_cons;
+ u32 hw_rx_prod;
+ u32 hw_rx_bd_prod;
+ u32 hw_rx_prod_cnt;
+
+ /* other */
+ u8 mac_addr[6];
+ u8 reserve[2];
+};
+
+struct qedi_rx_bd {
+ u32 rx_pkt_index;
+ u32 rx_pkt_len;
+ u16 vlan_id;
+};
+
+#define QEDI_RX_DESC_CNT (QEDI_PAGE_SIZE / sizeof(struct qedi_rx_bd))
+#define QEDI_MAX_RX_DESC_CNT (QEDI_RX_DESC_CNT - 1)
+#define QEDI_NUM_RX_BD (QEDI_RX_DESC_CNT * 1)
+#define QEDI_MAX_RX_BD (QEDI_NUM_RX_BD - 1)
+
+#define QEDI_NEXT_RX_IDX(x) ((((x) & (QEDI_MAX_RX_DESC_CNT)) == \
+ (QEDI_MAX_RX_DESC_CNT - 1)) ? \
+ (x) + 2 : (x) + 1)
+
+struct qedi_uio_dev {
+ struct uio_info qedi_uinfo;
+ u32 uio_dev;
+ struct list_head list;
+
+ u32 ll2_ring_size;
+ void *ll2_ring;
+
+ u32 ll2_buf_size;
+ void *ll2_buf;
+
+ void *rx_pkt;
+ void *tx_pkt;
+
+ struct qedi_ctx *qedi;
+ struct pci_dev *pdev;
+ void *uctrl;
+};
+
+/* List to maintain the skb pointers */
+struct skb_work_list {
+ struct list_head list;
+ struct sk_buff *skb;
+ u16 vlan_id;
+};
/* Queue sizes in number of elements */
#define QEDI_SQ_SIZE MAX_OUSTANDING_TASKS_PER_CON
diff --git a/drivers/scsi/qedi/qedi_main.c b/drivers/scsi/qedi/qedi_main.c
index 5845dc9..ef309c6 100644
--- a/drivers/scsi/qedi/qedi_main.c
+++ b/drivers/scsi/qedi/qedi_main.c
@@ -45,10 +45,13 @@
static struct scsi_transport_template *qedi_scsi_transport;
static struct pci_driver qedi_pci_driver;
static DEFINE_PER_CPU(struct qedi_percpu_s, qedi_percpu);
+static LIST_HEAD(qedi_udev_list);
/* Static function declaration */
static int qedi_alloc_global_queues(struct qedi_ctx *qedi);
static void qedi_free_global_queues(struct qedi_ctx *qedi);
static struct qedi_cmd *qedi_get_cmd_from_tid(struct qedi_ctx *qedi, u32 tid);
+static void qedi_reset_uio_rings(struct qedi_uio_dev *udev);
+static void qedi_ll2_free_skbs(struct qedi_ctx *qedi);
static int qedi_iscsi_event_cb(void *context, u8 fw_event_code, void
*fw_handle)
{
@@ -113,6 +116,224 @@ static int qedi_iscsi_event_cb(void *context, u8
fw_event_code, void *fw_handle)
return rval;
}
+static int qedi_uio_open(struct uio_info *uinfo, struct inode *inode)
+{
+ struct qedi_uio_dev *udev = uinfo->priv;
+ struct qedi_ctx *qedi = udev->qedi;
+
+ if (!capable(CAP_NET_ADMIN))
+ return -EPERM;
+
+ if (udev->uio_dev != -1)
+ return -EBUSY;
+
+ rtnl_lock();
+ udev->uio_dev = iminor(inode);
+ qedi_reset_uio_rings(udev);
+ set_bit(UIO_DEV_OPENED, &qedi->flags);
+ rtnl_unlock();
+
+ return 0;
+}
+
+static int qedi_uio_close(struct uio_info *uinfo, struct inode *inode)
+{
+ struct qedi_uio_dev *udev = uinfo->priv;
+ struct qedi_ctx *qedi = udev->qedi;
+
+ udev->uio_dev = -1;
+ clear_bit(UIO_DEV_OPENED, &qedi->flags);
+ qedi_ll2_free_skbs(qedi);
+ return 0;
+}
+
+static void __qedi_free_uio_rings(struct qedi_uio_dev *udev)
+{
+ if (udev->ll2_ring) {
+ free_page((unsigned long)udev->ll2_ring);
+ udev->ll2_ring = NULL;
+ }
+
+ if (udev->ll2_buf) {
+ free_pages((unsigned long)udev->ll2_buf, 2);
+ udev->ll2_buf = NULL;
+ }
+}
+
+static void __qedi_free_uio(struct qedi_uio_dev *udev)
+{
+ uio_unregister_device(&udev->qedi_uinfo);
+
+ __qedi_free_uio_rings(udev);
+
+ pci_dev_put(udev->pdev);
+ kfree(udev->uctrl);
+ kfree(udev);
+}
+
+static void qedi_free_uio(struct qedi_uio_dev *udev)
+{
+ if (!udev)
+ return;
+
+ list_del_init(&udev->list);
+ __qedi_free_uio(udev);
+}
+
+static void qedi_reset_uio_rings(struct qedi_uio_dev *udev)
+{
+ struct qedi_ctx *qedi = NULL;
+ struct qedi_uio_ctrl *uctrl = NULL;
+
+ qedi = udev->qedi;
+ uctrl = udev->uctrl;
+
+ spin_lock_bh(&qedi->ll2_lock);
+ uctrl->host_rx_cons = 0;
+ uctrl->hw_rx_prod = 0;
+ uctrl->hw_rx_bd_prod = 0;
+ uctrl->host_rx_bd_cons = 0;
+
+ memset(udev->ll2_ring, 0, udev->ll2_ring_size);
+ memset(udev->ll2_buf, 0, udev->ll2_buf_size);
+ spin_unlock_bh(&qedi->ll2_lock);
+}
+
+static int __qedi_alloc_uio_rings(struct qedi_uio_dev *udev)
+{
+ int rc = 0;
+
+ if (udev->ll2_ring || udev->ll2_buf)
+ return rc;
+
+ /* Allocating memory for LL2 ring */
+ udev->ll2_ring_size = QEDI_PAGE_SIZE;
+ udev->ll2_ring = (void *)get_zeroed_page(GFP_KERNEL | __GFP_COMP);
+ if (!udev->ll2_ring) {
+ rc = -ENOMEM;
+ goto exit_alloc_ring;
+ }
+
+ /* Allocating memory for Tx/Rx pkt buffer */
+ udev->ll2_buf_size = TX_RX_RING * LL2_SINGLE_BUF_SIZE;
+ udev->ll2_buf_size = QEDI_PAGE_ALIGN(udev->ll2_buf_size);
+ udev->ll2_buf = (void *)__get_free_pages(GFP_KERNEL | __GFP_COMP |
+ __GFP_ZERO, 2);
+ if (!udev->ll2_buf) {
+ rc = -ENOMEM;
+ goto exit_alloc_buf;
+ }
+ return rc;
+
+exit_alloc_buf:
+ free_page((unsigned long)udev->ll2_ring);
+ udev->ll2_ring = NULL;
+exit_alloc_ring:
+ return rc;
+}
+
+static int qedi_alloc_uio_rings(struct qedi_ctx *qedi)
+{
+ struct qedi_uio_dev *udev = NULL;
+ struct qedi_uio_ctrl *uctrl = NULL;
+ int rc = 0;
+
+ list_for_each_entry(udev, &qedi_udev_list, list) {
+ if (udev->pdev == qedi->pdev) {
+ udev->qedi = qedi;
+ if (__qedi_alloc_uio_rings(udev)) {
+ udev->qedi = NULL;
+ return -ENOMEM;
+ }
+ qedi->udev = udev;
+ return 0;
+ }
+ }
+
+ udev = kzalloc(sizeof(*udev), GFP_KERNEL);
+ if (!udev) {
+ rc = -ENOMEM;
+ goto err_udev;
+ }
+
+ uctrl = kzalloc(sizeof(*uctrl), GFP_KERNEL);
+ if (!uctrl) {
+ rc = -ENOMEM;
+ goto err_uctrl;
+ }
+
+ udev->uio_dev = -1;
+
+ udev->qedi = qedi;
+ udev->pdev = qedi->pdev;
+ udev->uctrl = uctrl;
+
+ rc = __qedi_alloc_uio_rings(udev);
+ if (rc)
+ goto err_uio_rings;
+
+ list_add(&udev->list, &qedi_udev_list);
+
+ pci_dev_get(udev->pdev);
+ qedi->udev = udev;
+
+ udev->tx_pkt = udev->ll2_buf;
+ udev->rx_pkt = udev->ll2_buf + LL2_SINGLE_BUF_SIZE;
+ return 0;
+
+ err_uio_rings:
+ kfree(uctrl);
+ err_uctrl:
+ kfree(udev);
+ err_udev:
+ return -ENOMEM;
+}
+
+static int qedi_init_uio(struct qedi_ctx *qedi)
+{
+ struct qedi_uio_dev *udev = qedi->udev;
+ struct uio_info *uinfo;
+ int ret = 0;
+
+ if (!udev)
+ return -ENOMEM;
+
+ uinfo = &udev->qedi_uinfo;
+
+ uinfo->mem[0].addr = (unsigned long)udev->uctrl;
+ uinfo->mem[0].size = sizeof(struct qedi_uio_ctrl);
+ uinfo->mem[0].memtype = UIO_MEM_LOGICAL;
+
+ uinfo->mem[1].addr = (unsigned long)udev->ll2_ring;
+ uinfo->mem[1].size = udev->ll2_ring_size;
+ uinfo->mem[1].memtype = UIO_MEM_LOGICAL;
+
+ uinfo->mem[2].addr = (unsigned long)udev->ll2_buf;
+ uinfo->mem[2].size = udev->ll2_buf_size;
+ uinfo->mem[2].memtype = UIO_MEM_LOGICAL;
+
+ uinfo->name = "qedi_uio";
+ uinfo->version = QEDI_MODULE_VERSION;
+ uinfo->irq = UIO_IRQ_CUSTOM;
+
+ uinfo->open = qedi_uio_open;
+ uinfo->release = qedi_uio_close;
+
+ if (udev->uio_dev == -1) {
+ if (!uinfo->priv) {
+ uinfo->priv = udev;
+
+ ret = uio_register_device(&udev->pdev->dev, uinfo);
+ if (ret) {
+ QEDI_ERR(&qedi->dbg_ctx,
+ "UIO registration failed\n");
+ }
+ }
+ }
+
+ return ret;
+}
+
static int qedi_alloc_and_init_sb(struct qedi_ctx *qedi,
struct qed_sb_info *sb_info, u16 sb_id)
{
@@ -442,6 +663,142 @@ static struct qedi_ctx *qedi_host_alloc(struct pci_dev
*pdev)
return qedi;
}
+static int qedi_ll2_rx(void *cookie, struct sk_buff *skb, u32 arg1, u32 arg2)
+{
+ struct qedi_ctx *qedi = (struct qedi_ctx *)cookie;
+ struct qedi_uio_dev *udev;
+ struct qedi_uio_ctrl *uctrl;
+ struct skb_work_list *work;
+ u32 prod;
+
+ if (!qedi) {
+ QEDI_ERR(NULL, "qedi is NULL\n");
+ return -1;
+ }
+
+ if (!test_bit(UIO_DEV_OPENED, &qedi->flags)) {
+ QEDI_INFO(&qedi->dbg_ctx, QEDI_LOG_UIO,
+ "UIO DEV is not opened\n");
+ kfree_skb(skb);
+ return 0;
+ }
+
+ udev = qedi->udev;
+ uctrl = udev->uctrl;
+
+ work = kzalloc(sizeof(*work), GFP_ATOMIC);
+ if (!work) {
+ QEDI_WARN(&qedi->dbg_ctx,
+ "Could not allocate work so dropping frame.\n");
+ kfree_skb(skb);
+ return 0;
+ }
+
+ INIT_LIST_HEAD(&work->list);
+ work->skb = skb;
+
+ if (skb_vlan_tag_present(skb))
+ work->vlan_id = skb_vlan_tag_get(skb);
+
+ if (work->vlan_id)
+ __vlan_insert_tag(work->skb, htons(ETH_P_8021Q), work->vlan_id);
+
+ spin_lock_bh(&qedi->ll2_lock);
+ list_add_tail(&work->list, &qedi->ll2_skb_list);
+
+ ++uctrl->hw_rx_prod_cnt;
+ prod = (uctrl->hw_rx_prod + 1) % RX_RING;
+ if (prod != uctrl->host_rx_cons) {
+ uctrl->hw_rx_prod = prod;
+ spin_unlock_bh(&qedi->ll2_lock);
+ wake_up_process(qedi->ll2_recv_thread);
+ return 0;
+ }
+
+ spin_unlock_bh(&qedi->ll2_lock);
+ return 0;
+}
+
+/* map this skb to iscsiuio mmaped region */
+static int qedi_ll2_process_skb(struct qedi_ctx *qedi, struct sk_buff *skb,
+ u16 vlan_id)
+{
+ struct qedi_uio_dev *udev = NULL;
+ struct qedi_uio_ctrl *uctrl = NULL;
+ struct qedi_rx_bd rxbd;
+ struct qedi_rx_bd *p_rxbd;
+ u32 rx_bd_prod;
+ void *pkt;
+ int len = 0;
+
+ if (!qedi) {
+ QEDI_ERR(NULL, "qedi is NULL\n");
+ return -1;
+ }
+
+ udev = qedi->udev;
+ uctrl = udev->uctrl;
+ pkt = udev->rx_pkt + (uctrl->hw_rx_prod * LL2_SINGLE_BUF_SIZE);
+ len = min_t(u32, skb->len, (u32)LL2_SINGLE_BUF_SIZE);
+ memcpy(pkt, skb->data, len);
+
+ memset(&rxbd, 0, sizeof(rxbd));
+ rxbd.rx_pkt_index = uctrl->hw_rx_prod;
+ rxbd.rx_pkt_len = len;
+ rxbd.vlan_id = vlan_id;
+
+ uctrl->hw_rx_bd_prod = (uctrl->hw_rx_bd_prod + 1) % QEDI_NUM_RX_BD;
+ rx_bd_prod = uctrl->hw_rx_bd_prod;
+ p_rxbd = (struct qedi_rx_bd *)udev->ll2_ring;
+ p_rxbd += rx_bd_prod;
+
+ memcpy(p_rxbd, &rxbd, sizeof(rxbd));
+
+ /* notify the iscsiuio about new packet */
+ uio_event_notify(&udev->qedi_uinfo);
+
+ return 0;
+}
+
+static void qedi_ll2_free_skbs(struct qedi_ctx *qedi)
+{
+ struct skb_work_list *work, *work_tmp;
+
+ spin_lock_bh(&qedi->ll2_lock);
+ list_for_each_entry_safe(work, work_tmp, &qedi->ll2_skb_list, list) {
+ list_del(&work->list);
+ if (work->skb)
+ kfree_skb(work->skb);
+ kfree(work);
+ }
+ spin_unlock_bh(&qedi->ll2_lock);
+}
+
+static int qedi_ll2_recv_thread(void *arg)
+{
+ struct qedi_ctx *qedi = (struct qedi_ctx *)arg;
+ struct skb_work_list *work, *work_tmp;
+
+ set_user_nice(current, -20);
+
+ while (!kthread_should_stop()) {
+ spin_lock_bh(&qedi->ll2_lock);
+ list_for_each_entry_safe(work, work_tmp, &qedi->ll2_skb_list,
+ list) {
+ list_del(&work->list);
+ qedi_ll2_process_skb(qedi, work->skb, work->vlan_id);
+ kfree_skb(work->skb);
+ kfree(work);
+ }
+ set_current_state(TASK_INTERRUPTIBLE);
+ spin_unlock_bh(&qedi->ll2_lock);
+ schedule();
+ }
+
+ __set_current_state(TASK_RUNNING);
+ return 0;
+}
+
static int qedi_set_iscsi_pf_param(struct qedi_ctx *qedi)
{
u8 num_sq_pages;
--
1.8.3.1
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