xdp/qede: setup xdp_rxq_info and intro xdp_rxq_info_is_reg

The driver code qede_free_fp_array() depend on kfree() can be called
with a NULL pointer. This stems from the qede_alloc_fp_array()
function which either (kz)alloc memory for fp->txq or fp->rxq.
This also simplifies error handling code in case of memory allocation
failures, but xdp_rxq_info_unreg need to know the difference.

Introduce xdp_rxq_info_is_reg() to handle if a memory allocation fails
and detect this is the failure path by seeing that xdp_rxq_info was
not registred yet, which first happens after successful alloaction in
qede_init_fp().

Driver hook points for xdp_rxq_info:
 * reg  : qede_init_fp
 * unreg: qede_free_fp_array

Tested on actual hardware with samples/bpf program.

V2: Driver have no proper error path for failed XDP RX-queue info reg, as
qede_init_fp() is a void function.

Cc: everest-linux-l2@cavium.com
Cc: Ariel Elior <Ariel.Elior@cavium.com>
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

diff --git a/drivers/net/ethernet/qlogic/qede/qede.h b/drivers/net/ethernet/qlogic/qede/qede.h
index 8a33651..8116cfd 100644 (file)
--- a/drivers/net/ethernet/qlogic/qede/qede.h
+++ b/drivers/net/ethernet/qlogic/qede/qede.h
@@ -40,6 +40,7 @@
 #include <linux/kernel.h>
 #include <linux/mutex.h>
 #include <linux/bpf.h>
+#include <net/xdp.h>
 #include <linux/qed/qede_rdma.h>
 #include <linux/io.h>
 #ifdef CONFIG_RFS_ACCEL
@@ -345,6 +346,7 @@ struct qede_rx_queue {
        u64 xdp_no_pass;
 
        void *handle;
+       struct xdp_rxq_info xdp_rxq;
 };
 
 union db_prod {

diff --git a/drivers/net/ethernet/qlogic/qede/qede_fp.c b/drivers/net/ethernet/qlogic/qede/qede_fp.c
index 48ec4c5..dafc079 100644 (file)
--- a/drivers/net/ethernet/qlogic/qede/qede_fp.c
+++ b/drivers/net/ethernet/qlogic/qede/qede_fp.c
@@ -1006,6 +1006,7 @@ static bool qede_rx_xdp(struct qede_dev *edev,
        xdp.data = xdp.data_hard_start + *data_offset;
        xdp_set_data_meta_invalid(&xdp);
        xdp.data_end = xdp.data + *len;
+       xdp.rxq = &rxq->xdp_rxq;
 
        /* Queues always have a full reset currently, so for the time
         * being until there's atomic program replace just mark read

diff --git a/drivers/net/ethernet/qlogic/qede/qede_main.c b/drivers/net/ethernet/qlogic/qede/qede_main.c
index 90d79ae..9929b43 100644 (file)
--- a/drivers/net/ethernet/qlogic/qede/qede_main.c
+++ b/drivers/net/ethernet/qlogic/qede/qede_main.c
@@ -765,6 +765,12 @@ static void qede_free_fp_array(struct qede_dev *edev)
                        fp = &edev->fp_array[i];
 
                        kfree(fp->sb_info);
+                       /* Handle mem alloc failure case where qede_init_fp
+                        * didn't register xdp_rxq_info yet.
+                        * Implicit only (fp->type & QEDE_FASTPATH_RX)
+                        */
+                       if (fp->rxq && xdp_rxq_info_is_reg(&fp->rxq->xdp_rxq))
+                               xdp_rxq_info_unreg(&fp->rxq->xdp_rxq);
                        kfree(fp->rxq);
                        kfree(fp->xdp_tx);
                        kfree(fp->txq);
@@ -1493,6 +1499,10 @@ static void qede_init_fp(struct qede_dev *edev)
                        else
                                fp->rxq->data_direction = DMA_FROM_DEVICE;
                        fp->rxq->dev = &edev->pdev->dev;
+
+                       /* Driver have no error path from here */
+                       WARN_ON(xdp_rxq_info_reg(&fp->rxq->xdp_rxq, edev->ndev,
+                                                fp->rxq->rxq_id) < 0);
                }
 
                if (fp->type & QEDE_FASTPATH_TX) {

diff --git a/include/net/xdp.h b/include/net/xdp.h
index 86c4163..b2362dd 100644 (file)
--- a/include/net/xdp.h
+++ b/include/net/xdp.h
@@ -43,5 +43,6 @@ int xdp_rxq_info_reg(struct xdp_rxq_info *xdp_rxq,
                     struct net_device *dev, u32 queue_index);
 void xdp_rxq_info_unreg(struct xdp_rxq_info *xdp_rxq);
 void xdp_rxq_info_unused(struct xdp_rxq_info *xdp_rxq);
+bool xdp_rxq_info_is_reg(struct xdp_rxq_info *xdp_rxq);
 
 #endif /* __LINUX_NET_XDP_H__ */

diff --git a/net/core/xdp.c b/net/core/xdp.c
index 229bc5a..097a0f7 100644 (file)
--- a/net/core/xdp.c
+++ b/net/core/xdp.c
@@ -65,3 +65,9 @@ void xdp_rxq_info_unused(struct xdp_rxq_info *xdp_rxq)
        xdp_rxq->reg_state = REG_STATE_UNUSED;
 }
 EXPORT_SYMBOL_GPL(xdp_rxq_info_unused);
+
+bool xdp_rxq_info_is_reg(struct xdp_rxq_info *xdp_rxq)
+{
+       return (xdp_rxq->reg_state == REG_STATE_REGISTERED);
+}
+EXPORT_SYMBOL_GPL(xdp_rxq_info_is_reg);