[PATCH] RDMA/cxgb4: Fail RDMA initialization for unsupported cards.
From: Steve Wise <hidden>
Date: 2011-08-01 21:59:10
Subsystem:
cxgb4 iwarp rnic driver (iw_cxgb4), infiniband subsystem, the rest · Maintainers:
Potnuri Bharat Teja, Jason Gunthorpe, Leon Romanovsky, Linus Torvalds
The iw_cxgb4 module crashes at init time if the T4 card does not support RDMA. So clean up the init logic to correctly deal with non-RDMA cards. - If any RDMA resources are not available, then fail the initializtion logging an info message. - Clean up properly on initialization failures. Signed-off-by: Steve Wise <redacted> --- drivers/infiniband/hw/cxgb4/device.c | 41 +++++++++++++++++++++++++++------- 1 files changed, 33 insertions(+), 8 deletions(-)
diff --git a/drivers/infiniband/hw/cxgb4/device.c b/drivers/infiniband/hw/cxgb4/device.c
index 40a13cc..6d0df6e 100644
--- a/drivers/infiniband/hw/cxgb4/device.c
+++ b/drivers/infiniband/hw/cxgb4/device.c@@ -376,10 +376,8 @@ struct uld_ctx { struct c4iw_dev *dev; }; -static void c4iw_remove(struct uld_ctx *ctx) +static void c4iw_dealloc(struct uld_ctx *ctx) { - PDBG("%s c4iw_dev %p\n", __func__, ctx->dev); - c4iw_unregister_device(ctx->dev); c4iw_rdev_close(&ctx->dev->rdev); idr_destroy(&ctx->dev->cqidr); idr_destroy(&ctx->dev->qpidr);
@@ -389,11 +387,30 @@ static void c4iw_remove(struct uld_ctx *ctx) ctx->dev = NULL; } +static void c4iw_remove(struct uld_ctx *ctx) +{ + PDBG("%s c4iw_dev %p\n", __func__, ctx->dev); + c4iw_unregister_device(ctx->dev); + c4iw_dealloc(ctx); +} + +static int rdma_supported(const struct cxgb4_lld_info *infop) +{ + return infop->vr->stag.size > 0 && infop->vr->pbl.size > 0 && + infop->vr->rq.size > 0 && infop->vr->qp.size > 0 && + infop->vr->cq.size > 0 && infop->vr->ocq.size > 0; +} + static struct c4iw_dev *c4iw_alloc(const struct cxgb4_lld_info *infop) { struct c4iw_dev *devp; int ret; + if (!rdma_supported(infop)) { + printk(KERN_INFO MOD "%s: RDMA not supported on this device.\n", + pci_name(infop->pdev)); + return ERR_PTR(-ENOSYS); + } devp = (struct c4iw_dev *)ib_alloc_device(sizeof(*devp)); if (!devp) { printk(KERN_ERR MOD "Cannot allocate ib device\n");
@@ -414,7 +431,6 @@ static struct c4iw_dev *c4iw_alloc(const struct cxgb4_lld_info *infop) ret = c4iw_rdev_open(&devp->rdev); if (ret) { - mutex_unlock(&dev_mutex); printk(KERN_ERR MOD "Unable to open CXIO rdev err %d\n", ret); ib_dealloc_device(&devp->ibdev); return ERR_PTR(ret);
@@ -519,15 +535,24 @@ static int c4iw_uld_state_change(void *handle, enum cxgb4_state new_state) case CXGB4_STATE_UP: printk(KERN_INFO MOD "%s: Up\n", pci_name(ctx->lldi.pdev)); if (!ctx->dev) { - int ret = 0; + int ret; ctx->dev = c4iw_alloc(&ctx->lldi); - if (!IS_ERR(ctx->dev)) - ret = c4iw_register_device(ctx->dev); - if (IS_ERR(ctx->dev) || ret) + if (IS_ERR(ctx->dev)) { + printk(KERN_ERR MOD + "%s: initialization failed: %ld\n", + pci_name(ctx->lldi.pdev), + PTR_ERR(ctx->dev)); + ctx->dev = NULL; + break; + } + ret = c4iw_register_device(ctx->dev); + if (ret) { printk(KERN_ERR MOD "%s: RDMA registration failed: %d\n", pci_name(ctx->lldi.pdev), ret); + c4iw_dealloc(ctx); + } } break; case CXGB4_STATE_DOWN: --
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