[PATCH 3/5 2.6.30] cxgb3i - re-initialize ddp settings after chip reset

From: Karen Xie <k...@chelsio.com>

Re-initialize the ddp settings after chip reset. It includes re-initialize
the related registers and the ddp map.

Signed-off-by: Karen Xie <k...@chelsio.com>
---

 drivers/scsi/cxgb3i/cxgb3i_ddp.c |  242 ++++++++++++++++++--------------------
 drivers/scsi/cxgb3i/cxgb3i_ddp.h |    3 
 2 files changed, 118 insertions(+), 127 deletions(-)


diff --git a/drivers/scsi/cxgb3i/cxgb3i_ddp.c b/drivers/scsi/cxgb3i/cxgb3i_ddp.c
index 4eb6f55..52df2c2 100644
--- a/drivers/scsi/cxgb3i/cxgb3i_ddp.c
+++ b/drivers/scsi/cxgb3i/cxgb3i_ddp.c
@@ -66,9 +66,6 @@ static unsigned char ddp_page_order[DDP_PGIDX_MAX] = {0, 1, 
2, 4};
 static unsigned char ddp_page_shift[DDP_PGIDX_MAX] = {12, 13, 14, 16};
 static unsigned char page_idx = DDP_PGIDX_MAX;
 
-static LIST_HEAD(cxgb3i_ddp_list);
-static DEFINE_RWLOCK(cxgb3i_ddp_rwlock);
-
 /*
  * functions to program the pagepod in h/w
  */
@@ -113,8 +110,8 @@ static int set_ddp_map(struct cxgb3i_ddp_info *ddp, struct 
pagepod_hdr *hdr,
        return 0;
 }
 
-static int clear_ddp_map(struct cxgb3i_ddp_info *ddp, unsigned int idx,
-                        unsigned int npods)
+static void clear_ddp_map(struct cxgb3i_ddp_info *ddp, unsigned int tag,
+                        unsigned int idx, unsigned int npods)
 {
        unsigned int pm_addr = (idx << PPOD_SIZE_SHIFT) + ddp->llimit;
        int i;
@@ -122,13 +119,17 @@ static int clear_ddp_map(struct cxgb3i_ddp_info *ddp, 
unsigned int idx,
        for (i = 0; i < npods; i++, idx++, pm_addr += PPOD_SIZE) {
                struct sk_buff *skb = ddp->gl_skb[idx];
 
+               if (!skb) {
+                       ddp_log_error("ddp tag 0x%x, 0x%x, %d/%u, skb NULL.\n",
+                                       tag, idx, i, npods);
+                       continue;
+               }
                ddp->gl_skb[idx] = NULL;
                memset((skb->head + sizeof(struct ulp_mem_io)), 0, PPOD_SIZE);
                ulp_mem_io_set_hdr(skb, pm_addr);
                skb->priority = CPL_PRIORITY_CONTROL;
                cxgb3_ofld_send(ddp->tdev, skb);
        }
-       return 0;
 }
 
 static inline int ddp_find_unused_entries(struct cxgb3i_ddp_info *ddp,
@@ -453,15 +454,15 @@ void cxgb3i_ddp_tag_release(struct t3cdev *tdev, u32 tag)
                struct cxgb3i_gather_list *gl = ddp->gl_map[idx];
                unsigned int npods;
 
-               if (!gl) {
-                       ddp_log_error("release ddp 0x%x, idx 0x%x, gl NULL.\n",
-                                     tag, idx);
+               if (!gl || !gl->nelem) {
+                       ddp_log_error("release 0x%x, idx 0x%x, gl 0x%p, %u.\n",
+                                     tag, idx, gl, gl ? gl->nelem : 0);
                        return;
                }
                npods = (gl->nelem + PPOD_PAGES_MAX - 1) >> PPOD_PAGES_SHIFT;
                ddp_log_debug("ddp tag 0x%x, release idx 0x%x, npods %u.\n",
                              tag, idx, npods);
-               clear_ddp_map(ddp, idx, npods);
+               clear_ddp_map(ddp, tag, idx, npods);
                ddp_unmark_entries(ddp, idx, npods);
                cxgb3i_ddp_release_gl(gl, ddp->pdev);
        } else
@@ -564,7 +565,87 @@ int cxgb3i_setup_conn_digest(struct t3cdev *tdev, unsigned 
int tid,
 }
 EXPORT_SYMBOL_GPL(cxgb3i_setup_conn_digest);
 
-static int ddp_init(struct t3cdev *tdev)
+
+/**
+ * cxgb3i_adapter_ddp_info - read the adapter's ddp information
+ * @tdev: t3cdev adapter
+ * @tformat: tag format
+ * @txsz: max tx pdu payload size, filled in by this func.
+ * @rxsz: max rx pdu payload size, filled in by this func.
+ * setup the tag format for a given iscsi entity
+ */
+int cxgb3i_adapter_ddp_info(struct t3cdev *tdev,
+                           struct cxgb3i_tag_format *tformat,
+                           unsigned int *txsz, unsigned int *rxsz)
+{
+       struct cxgb3i_ddp_info *ddp;
+       unsigned char idx_bits;
+
+       if (!tformat)
+               return -EINVAL;
+
+       if (!tdev->ulp_iscsi)
+               return -EINVAL;
+
+       ddp = (struct cxgb3i_ddp_info *)tdev->ulp_iscsi;
+
+       idx_bits = 32 - tformat->sw_bits;
+       tformat->rsvd_bits = ddp->idx_bits;
+       tformat->rsvd_shift = PPOD_IDX_SHIFT;
+       tformat->rsvd_mask = (1 << tformat->rsvd_bits) - 1;
+
+       ddp_log_info("tag format: sw %u, rsvd %u,%u, mask 0x%x.\n",
+                     tformat->sw_bits, tformat->rsvd_bits,
+                     tformat->rsvd_shift, tformat->rsvd_mask);
+
+       *txsz = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
+                       ddp->max_txsz - ISCSI_PDU_NONPAYLOAD_LEN);
+       *rxsz = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
+                       ddp->max_rxsz - ISCSI_PDU_NONPAYLOAD_LEN);
+       ddp_log_info("max payload size: %u/%u, %u/%u.\n",
+                    *txsz, ddp->max_txsz, *rxsz, ddp->max_rxsz);
+       return 0;
+}
+EXPORT_SYMBOL_GPL(cxgb3i_adapter_ddp_info);
+
+/**
+ * ddp_release - release the cxgb3 adapter's ddp resource
+ * @tdev: t3cdev adapter
+ * release all the resource held by the ddp pagepod manager for a given
+ * adapter if needed
+ */
+static void ddp_release(struct t3cdev *tdev)
+{
+       int i = 0;
+       struct cxgb3i_ddp_info *ddp = (struct cxgb3i_ddp_info *)tdev->ulp_iscsi;
+
+       ddp_log_info("t3dev 0x%p, release ddp 0x%p.\n", tdev, ddp);
+
+       if (ddp) {
+               tdev->ulp_iscsi = NULL;
+               while (i < ddp->nppods) {
+                       struct cxgb3i_gather_list *gl = ddp->gl_map[i];
+                       if (gl) {
+                               int npods = (gl->nelem + PPOD_PAGES_MAX - 1)
+                                               >> PPOD_PAGES_SHIFT;
+                               ddp_log_info("t3dev 0x%p, ddp %d + %d.\n",
+                                               tdev, i, npods);
+                               kfree(gl);
+                               ddp_free_gl_skb(ddp, i, npods);
+                               i += npods;
+                       } else
+                               i++;
+               }
+               cxgb3i_free_big_mem(ddp);
+       }
+}
+
+/**
+ * ddp_init - initialize the cxgb3 adapter's ddp resource
+ * @tdev: t3cdev adapter
+ * initialize the ddp pagepod manager for a given adapter
+ */
+static void ddp_init(struct t3cdev *tdev)
 {
        struct cxgb3i_ddp_info *ddp;
        struct ulp_iscsi_info uinfo;
@@ -572,6 +653,12 @@ static int ddp_init(struct t3cdev *tdev)
        int i, err;
        static int vers_printed;
 
+       if (tdev->ulp_iscsi) {
+               ddp_log_warn("t3dev 0x%p, ddp 0x%p already set up.\n",
+                               tdev, tdev->ulp_iscsi);
+               return;
+       }
+
        if (!vers_printed) {
                printk(KERN_INFO "%s", version);
                vers_printed = 1;
@@ -581,7 +668,7 @@ static int ddp_init(struct t3cdev *tdev)
        if (err < 0) {
                ddp_log_error("%s, failed to get iscsi param err=%d.\n",
                                 tdev->name, err);
-               return err;
+               return;
        }
 
        ppmax = (uinfo.ulimit - uinfo.llimit + 1) >> PPOD_SIZE_SHIFT;
@@ -598,7 +685,7 @@ static int ddp_init(struct t3cdev *tdev)
        if (!ddp) {
                ddp_log_warn("%s unable to alloc ddp 0x%d, ddp disabled.\n",
                             tdev->name, ppmax);
-               return 0;
+               return;
        }
        ddp->gl_map = (struct cxgb3i_gather_list **)(ddp + 1);
        ddp->gl_skb = (struct sk_buff **)(((char *)ddp->gl_map) +
@@ -632,141 +719,46 @@ static int ddp_init(struct t3cdev *tdev)
 
        tdev->ulp_iscsi = ddp;
 
-       /* add to the list */
-       write_lock(&cxgb3i_ddp_rwlock);
-       list_add_tail(&ddp->list, &cxgb3i_ddp_list);
-       write_unlock(&cxgb3i_ddp_rwlock);
-
-       ddp_log_info("nppods %u (0x%x ~ 0x%x), bits %u, mask 0x%x,0x%x "
-                       "pkt %u/%u, %u/%u.\n",
-                       ppmax, ddp->llimit, ddp->ulimit, ddp->idx_bits,
-                       ddp->idx_mask, ddp->rsvd_tag_mask,
-                       ddp->max_txsz, uinfo.max_txsz,
+       ddp_log_info("tdev 0x%p, nppods %u, bits %u, mask 0x%x,0x%x pkt %u/%u,"
+                       " %u/%u.\n",
+                       tdev, ppmax, ddp->idx_bits, ddp->idx_mask,
+                       ddp->rsvd_tag_mask, ddp->max_txsz, uinfo.max_txsz,
                        ddp->max_rxsz, uinfo.max_rxsz);
-       return 0;
+       return;
 
 free_ddp_map:
        cxgb3i_free_big_mem(ddp);
-       return err;
 }
 
-/**
- * cxgb3i_adapter_ddp_init - initialize the adapter's ddp resource
- * @tdev: t3cdev adapter
- * @tformat: tag format
- * @txsz: max tx pdu payload size, filled in by this func.
- * @rxsz: max rx pdu payload size, filled in by this func.
- * initialize the ddp pagepod manager for a given adapter if needed and
- * setup the tag format for a given iscsi entity
- */
-int cxgb3i_adapter_ddp_init(struct t3cdev *tdev,
-                           struct cxgb3i_tag_format *tformat,
-                           unsigned int *txsz, unsigned int *rxsz)
-{
-       struct cxgb3i_ddp_info *ddp;
-       unsigned char idx_bits;
-
-       if (!tformat)
-               return -EINVAL;
-
-       if (!tdev->ulp_iscsi) {
-               int err = ddp_init(tdev);
-               if (err < 0)
-                       return err;
-       }
-       ddp = (struct cxgb3i_ddp_info *)tdev->ulp_iscsi;
-
-       idx_bits = 32 - tformat->sw_bits;
-       tformat->rsvd_bits = ddp->idx_bits;
-       tformat->rsvd_shift = PPOD_IDX_SHIFT;
-       tformat->rsvd_mask = (1 << tformat->rsvd_bits) - 1;
-
-       ddp_log_info("tag format: sw %u, rsvd %u,%u, mask 0x%x.\n",
-                     tformat->sw_bits, tformat->rsvd_bits,
-                     tformat->rsvd_shift, tformat->rsvd_mask);
-
-       *txsz = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
-                       ddp->max_txsz - ISCSI_PDU_NONPAYLOAD_LEN);
-       *rxsz = min_t(unsigned int, ULP2_MAX_PDU_PAYLOAD,
-                       ddp->max_rxsz - ISCSI_PDU_NONPAYLOAD_LEN);
-       ddp_log_info("max payload size: %u/%u, %u/%u.\n",
-                    *txsz, ddp->max_txsz, *rxsz, ddp->max_rxsz);
-       return 0;
-}
-EXPORT_SYMBOL_GPL(cxgb3i_adapter_ddp_init);
-
-static void ddp_release(struct cxgb3i_ddp_info *ddp)
-{
-       int i = 0;
-       struct t3cdev *tdev = ddp->tdev;
-
-       tdev->ulp_iscsi = NULL;
-       while (i < ddp->nppods) {
-               struct cxgb3i_gather_list *gl = ddp->gl_map[i];
-               if (gl) {
-                       int npods = (gl->nelem + PPOD_PAGES_MAX - 1)
-                                    >> PPOD_PAGES_SHIFT;
-
-                       kfree(gl);
-                       ddp_free_gl_skb(ddp, i, npods);
-               } else
-                       i++;
-       }
-       cxgb3i_free_big_mem(ddp);
-}
-
-/**
- * cxgb3i_adapter_ddp_cleanup - release the adapter's ddp resource
- * @tdev: t3cdev adapter
- * release all the resource held by the ddp pagepod manager for a given
- * adapter if needed
- */
-void cxgb3i_adapter_ddp_cleanup(struct t3cdev *tdev)
-{
-       struct cxgb3i_ddp_info *ddp;
-
-       /* remove from the list */
-       write_lock(&cxgb3i_ddp_rwlock);
-       list_for_each_entry(ddp, &cxgb3i_ddp_list, list) {
-               if (ddp->tdev == tdev) {
-                       list_del(&ddp->list);
-                       break;
-               }
-       }
-       write_unlock(&cxgb3i_ddp_rwlock);
-
-       if (ddp)
-               ddp_release(ddp);
-}
-EXPORT_SYMBOL_GPL(cxgb3i_adapter_ddp_cleanup);
+static struct cxgb3_client t3c_ddp_client = {
+       .name = "iscsiddp_cxgb3",
+       .add = ddp_init,
+       .remove = ddp_release,
+};
 
 /**
  * cxgb3i_ddp_init_module - module init entry point
- * initialize any driver wide global data structures
+ * initialize any driver wide global data structures and register with the
+ * cxgb3 module
  */
 static int __init cxgb3i_ddp_init_module(void)
 {
        page_idx = cxgb3i_ddp_find_page_index(PAGE_SIZE);
        ddp_log_info("system PAGE_SIZE %lu, ddp idx %u.\n",
                     PAGE_SIZE, page_idx);
+
+       cxgb3_register_client(&t3c_ddp_client);
        return 0;
 }
 
 /**
  * cxgb3i_ddp_exit_module - module cleanup/exit entry point
- * go through the ddp list and release any resource held.
+ * go through the ddp list, unregister with the cxgb3 module and release
+ * any resource held.
  */
 static void __exit cxgb3i_ddp_exit_module(void)
 {
-       struct cxgb3i_ddp_info *ddp;
-
-       /* release all ddp manager if there is any */
-       write_lock(&cxgb3i_ddp_rwlock);
-       list_for_each_entry(ddp, &cxgb3i_ddp_list, list) {
-               list_del(&ddp->list);
-               ddp_release(ddp);
-       }
-       write_unlock(&cxgb3i_ddp_rwlock);
+       cxgb3_unregister_client(&t3c_ddp_client);
 }
 
 module_init(cxgb3i_ddp_init_module);
diff --git a/drivers/scsi/cxgb3i/cxgb3i_ddp.h b/drivers/scsi/cxgb3i/cxgb3i_ddp.h
index 75a63a8..87f032b 100644
--- a/drivers/scsi/cxgb3i/cxgb3i_ddp.h
+++ b/drivers/scsi/cxgb3i/cxgb3i_ddp.h
@@ -301,7 +301,6 @@ int cxgb3i_setup_conn_pagesize(struct t3cdev *, unsigned 
int tid, int reply,
 int cxgb3i_setup_conn_digest(struct t3cdev *, unsigned int tid,
                                int hcrc, int dcrc, int reply);
 int cxgb3i_ddp_find_page_index(unsigned long pgsz);
-int cxgb3i_adapter_ddp_init(struct t3cdev *, struct cxgb3i_tag_format *,
+int cxgb3i_adapter_ddp_info(struct t3cdev *, struct cxgb3i_tag_format *,
                            unsigned int *txsz, unsigned int *rxsz);
-void cxgb3i_adapter_ddp_cleanup(struct t3cdev *);
 #endif

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