net/bnxt: add Tx TruFlow table config for P4 device

[dpdk.git] / drivers / net / af_packet / rte_eth_af_packet.c

diff --git a/drivers/net/af_packet/rte_eth_af_packet.c b/drivers/net/af_packet/rte_eth_af_packet.c
index cea7091..1396f32 100644 (file)
--- a/drivers/net/af_packet/rte_eth_af_packet.c
+++ b/drivers/net/af_packet/rte_eth_af_packet.c
@@ -237,8 +237,30 @@ eth_af_packet_tx(void *queue, struct rte_mbuf **bufs, uint16_t nb_pkts)
                }
 
                /* point at the next incoming frame */
-               if (!tx_ring_status_available(ppd->tp_status) &&
-                   poll(&pfd, 1, -1) < 0)
+               if (!tx_ring_status_available(ppd->tp_status)) {
+                       if (poll(&pfd, 1, -1) < 0)
+                               break;
+
+                       /* poll() can return POLLERR if the interface is down */
+                       if (pfd.revents & POLLERR)
+                               break;
+               }
+
+               /*
+                * poll() will almost always return POLLOUT, even if there
+                * are no extra buffers available
+                *
+                * This happens, because packet_poll() calls datagram_poll()
+                * which checks the space left in the socket buffer and,
+                * in the case of packet_mmap, the default socket buffer length
+                * doesn't match the requested size for the tx_ring.
+                * As such, there is almost always space left in socket buffer,
+                * which doesn't seem to be correlated to the requested size
+                * for the tx_ring in packet_mmap.
+                *
+                * This results in poll() returning POLLOUT.
+                */
+               if (!tx_ring_status_available(ppd->tp_status))
                        break;
 
                /* copy the tx frame data */