ionic: reduce contiguous memory allocation requirement

Split out the queue descriptor blocks into separate dma
allocations to make for smaller blocks.

Co-developed-by: Neel Patel <neel@pensando.io>
Signed-off-by: Shannon Nelson <snelson@pensando.io>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/pensando/ionic/ionic_debugfs.c b/drivers/net/ethernet/pensando/ionic/ionic_debugfs.c
index 11621cc..e12dbe4 100644 (file)
--- a/drivers/net/ethernet/pensando/ionic/ionic_debugfs.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_debugfs.c
@@ -112,7 +112,8 @@ static const struct debugfs_reg32 intr_ctrl_regs[] = {
 
 void ionic_debugfs_add_qcq(struct ionic_lif *lif, struct ionic_qcq *qcq)
 {
-       struct dentry *q_dentry, *cq_dentry, *intr_dentry, *stats_dentry;
+       struct dentry *qcq_dentry, *q_dentry, *cq_dentry;
+       struct dentry *intr_dentry, *stats_dentry;
        struct ionic_dev *idev = &lif->ionic->idev;
        struct debugfs_regset32 *intr_ctrl_regset;
        struct ionic_intr_info *intr = &qcq->intr;
@@ -121,21 +122,21 @@ void ionic_debugfs_add_qcq(struct ionic_lif *lif, struct ionic_qcq *qcq)
        struct ionic_queue *q = &qcq->q;
        struct ionic_cq *cq = &qcq->cq;
 
-       qcq->dentry = debugfs_create_dir(q->name, lif->dentry);
+       qcq_dentry = debugfs_create_dir(q->name, lif->dentry);
+       if (IS_ERR_OR_NULL(qcq_dentry))
+               return;
+       qcq->dentry = qcq_dentry;
 
-       debugfs_create_x32("total_size", 0400, qcq->dentry, &qcq->total_size);
-       debugfs_create_x64("base_pa", 0400, qcq->dentry, &qcq->base_pa);
+       debugfs_create_x64("q_base_pa", 0400, qcq_dentry, &qcq->q_base_pa);
+       debugfs_create_x32("q_size", 0400, qcq_dentry, &qcq->q_size);
+       debugfs_create_x64("cq_base_pa", 0400, qcq_dentry, &qcq->cq_base_pa);
+       debugfs_create_x32("cq_size", 0400, qcq_dentry, &qcq->cq_size);
+       debugfs_create_x64("sg_base_pa", 0400, qcq_dentry, &qcq->sg_base_pa);
+       debugfs_create_x32("sg_size", 0400, qcq_dentry, &qcq->sg_size);
 
        q_dentry = debugfs_create_dir("q", qcq->dentry);
 
        debugfs_create_u32("index", 0400, q_dentry, &q->index);
-       debugfs_create_x64("base_pa", 0400, q_dentry, &q->base_pa);
-       if (qcq->flags & IONIC_QCQ_F_SG) {
-               debugfs_create_x64("sg_base_pa", 0400, q_dentry,
-                                  &q->sg_base_pa);
-               debugfs_create_u32("sg_desc_size", 0400, q_dentry,
-                                  &q->sg_desc_size);
-       }
        debugfs_create_u32("num_descs", 0400, q_dentry, &q->num_descs);
        debugfs_create_u32("desc_size", 0400, q_dentry, &q->desc_size);
        debugfs_create_u32("pid", 0400, q_dentry, &q->pid);

diff --git a/drivers/net/ethernet/pensando/ionic/ionic_lif.c b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
index 6a50bb6..c63d5dc 100644 (file)
--- a/drivers/net/ethernet/pensando/ionic/ionic_lif.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_lif.c
@@ -306,9 +306,23 @@ static void ionic_qcq_free(struct ionic_lif *lif, struct ionic_qcq *qcq)
 
        ionic_debugfs_del_qcq(qcq);
 
-       dma_free_coherent(dev, qcq->total_size, qcq->base, qcq->base_pa);
-       qcq->base = NULL;
-       qcq->base_pa = 0;
+       if (qcq->q_base) {
+               dma_free_coherent(dev, qcq->q_size, qcq->q_base, qcq->q_base_pa);
+               qcq->q_base = NULL;
+               qcq->q_base_pa = 0;
+       }
+
+       if (qcq->cq_base) {
+               dma_free_coherent(dev, qcq->cq_size, qcq->cq_base, qcq->cq_base_pa);
+               qcq->cq_base = NULL;
+               qcq->cq_base_pa = 0;
+       }
+
+       if (qcq->sg_base) {
+               dma_free_coherent(dev, qcq->sg_size, qcq->sg_base, qcq->sg_base_pa);
+               qcq->sg_base = NULL;
+               qcq->sg_base_pa = 0;
+       }
 
        if (qcq->flags & IONIC_QCQ_F_INTR) {
                irq_set_affinity_hint(qcq->intr.vector, NULL);
@@ -374,7 +388,6 @@ static int ionic_qcq_alloc(struct ionic_lif *lif, unsigned int type,
                           unsigned int pid, struct ionic_qcq **qcq)
 {
        struct ionic_dev *idev = &lif->ionic->idev;
-       u32 q_size, cq_size, sg_size, total_size;
        struct device *dev = lif->ionic->dev;
        void *q_base, *cq_base, *sg_base;
        dma_addr_t cq_base_pa = 0;
@@ -385,21 +398,6 @@ static int ionic_qcq_alloc(struct ionic_lif *lif, unsigned int type,
 
        *qcq = NULL;
 
-       q_size  = num_descs * desc_size;
-       cq_size = num_descs * cq_desc_size;
-       sg_size = num_descs * sg_desc_size;
-
-       total_size = ALIGN(q_size, PAGE_SIZE) + ALIGN(cq_size, PAGE_SIZE);
-       /* Note: aligning q_size/cq_size is not enough due to cq_base
-        * address aligning as q_base could be not aligned to the page.
-        * Adding PAGE_SIZE.
-        */
-       total_size += PAGE_SIZE;
-       if (flags & IONIC_QCQ_F_SG) {
-               total_size += ALIGN(sg_size, PAGE_SIZE);
-               total_size += PAGE_SIZE;
-       }
-
        new = devm_kzalloc(dev, sizeof(*new), GFP_KERNEL);
        if (!new) {
                netdev_err(lif->netdev, "Cannot allocate queue structure\n");
@@ -414,7 +412,7 @@ static int ionic_qcq_alloc(struct ionic_lif *lif, unsigned int type,
        if (!new->q.info) {
                netdev_err(lif->netdev, "Cannot allocate queue info\n");
                err = -ENOMEM;
-               goto err_out;
+               goto err_out_free_qcq;
        }
 
        new->q.type = type;
@@ -423,7 +421,7 @@ static int ionic_qcq_alloc(struct ionic_lif *lif, unsigned int type,
                           desc_size, sg_desc_size, pid);
        if (err) {
                netdev_err(lif->netdev, "Cannot initialize queue\n");
-               goto err_out;
+               goto err_out_free_q_info;
        }
 
        if (flags & IONIC_QCQ_F_INTR) {
@@ -471,46 +469,68 @@ static int ionic_qcq_alloc(struct ionic_lif *lif, unsigned int type,
        err = ionic_cq_init(lif, &new->cq, &new->intr, num_descs, cq_desc_size);
        if (err) {
                netdev_err(lif->netdev, "Cannot initialize completion queue\n");
-               goto err_out_free_irq;
+               goto err_out_free_cq_info;
        }
 
-       new->base = dma_alloc_coherent(dev, total_size, &new->base_pa,
-                                      GFP_KERNEL);
-       if (!new->base) {
+       new->q_size = PAGE_SIZE + (num_descs * desc_size);
+       new->q_base = dma_alloc_coherent(dev, new->q_size, &new->q_base_pa,
+                                        GFP_KERNEL);
+       if (!new->q_base) {
                netdev_err(lif->netdev, "Cannot allocate queue DMA memory\n");
                err = -ENOMEM;
-               goto err_out_free_irq;
+               goto err_out_free_cq_info;
        }
+       q_base = PTR_ALIGN(new->q_base, PAGE_SIZE);
+       q_base_pa = ALIGN(new->q_base_pa, PAGE_SIZE);
+       ionic_q_map(&new->q, q_base, q_base_pa);
 
-       new->total_size = total_size;
-
-       q_base = new->base;
-       q_base_pa = new->base_pa;
-
-       cq_base = (void *)ALIGN((uintptr_t)q_base + q_size, PAGE_SIZE);
-       cq_base_pa = ALIGN(q_base_pa + q_size, PAGE_SIZE);
+       new->cq_size = PAGE_SIZE + (num_descs * cq_desc_size);
+       new->cq_base = dma_alloc_coherent(dev, new->cq_size, &new->cq_base_pa,
+                                         GFP_KERNEL);
+       if (!new->cq_base) {
+               netdev_err(lif->netdev, "Cannot allocate cq DMA memory\n");
+               err = -ENOMEM;
+               goto err_out_free_q;
+       }
+       cq_base = PTR_ALIGN(new->cq_base, PAGE_SIZE);
+       cq_base_pa = ALIGN(new->cq_base_pa, PAGE_SIZE);
+       ionic_cq_map(&new->cq, cq_base, cq_base_pa);
+       ionic_cq_bind(&new->cq, &new->q);
 
        if (flags & IONIC_QCQ_F_SG) {
-               sg_base = (void *)ALIGN((uintptr_t)cq_base + cq_size,
-                                       PAGE_SIZE);
-               sg_base_pa = ALIGN(cq_base_pa + cq_size, PAGE_SIZE);
+               new->sg_size = PAGE_SIZE + (num_descs * sg_desc_size);
+               new->sg_base = dma_alloc_coherent(dev, new->sg_size, &new->sg_base_pa,
+                                                 GFP_KERNEL);
+               if (!new->sg_base) {
+                       netdev_err(lif->netdev, "Cannot allocate sg DMA memory\n");
+                       err = -ENOMEM;
+                       goto err_out_free_cq;
+               }
+               sg_base = PTR_ALIGN(new->sg_base, PAGE_SIZE);
+               sg_base_pa = ALIGN(new->sg_base_pa, PAGE_SIZE);
                ionic_q_sg_map(&new->q, sg_base, sg_base_pa);
        }
 
-       ionic_q_map(&new->q, q_base, q_base_pa);
-       ionic_cq_map(&new->cq, cq_base, cq_base_pa);
-       ionic_cq_bind(&new->cq, &new->q);
-
        *qcq = new;
 
        return 0;
 
+err_out_free_cq:
+       dma_free_coherent(dev, new->cq_size, new->cq_base, new->cq_base_pa);
+err_out_free_q:
+       dma_free_coherent(dev, new->q_size, new->q_base, new->q_base_pa);
+err_out_free_cq_info:
+       devm_kfree(dev, new->cq.info);
 err_out_free_irq:
        if (flags & IONIC_QCQ_F_INTR)
                devm_free_irq(dev, new->intr.vector, &new->napi);
 err_out_free_intr:
        if (flags & IONIC_QCQ_F_INTR)
                ionic_intr_free(lif->ionic, new->intr.index);
+err_out_free_q_info:
+       devm_kfree(dev, new->q.info);
+err_out_free_qcq:
+       devm_kfree(dev, new);
 err_out:
        dev_err(dev, "qcq alloc of %s%d failed %d\n", name, index, err);
        return err;

diff --git a/drivers/net/ethernet/pensando/ionic/ionic_lif.h b/drivers/net/ethernet/pensando/ionic/ionic_lif.h
index 517b511..aa7c1a8 100644 (file)
--- a/drivers/net/ethernet/pensando/ionic/ionic_lif.h
+++ b/drivers/net/ethernet/pensando/ionic/ionic_lif.h
@@ -57,9 +57,15 @@ struct ionic_napi_stats {
 };
 
 struct ionic_qcq {
-       void *base;
-       dma_addr_t base_pa;
-       unsigned int total_size;
+       void *q_base;
+       dma_addr_t q_base_pa;
+       u32 q_size;
+       void *cq_base;
+       dma_addr_t cq_base_pa;
+       u32 cq_size;
+       void *sg_base;
+       dma_addr_t sg_base_pa;
+       u32 sg_size;
        struct ionic_queue q;
        struct ionic_cq cq;
        struct ionic_intr_info intr;