linuxkpi: Define `synchronize_hardirq()`

[dumbbell]

Summary

It currently does the same as synchronize_irq().

This is part of the update of the DRM drivers to Linux 5.13.

sys/compat/linuxkpi/common/include/linux/hardirq.h

  * SUCH DAMAGE.
  */
 
 /* $FreeBSD$ */
 #include "if_em.h"
 #include <sys/sbuf.h>
 #include <machine/_inttypes.h>
 
-#define em_mac_min e1000_82547
+#define em_mac_min e1000_82571
 #define igb_mac_min e1000_82575
 
 /*********************************************************************
  *  Driver version:
  *********************************************************************/
 char em_driver_version[] = "7.6.1-k";
 
 /*********************************************************************
em_reset(if_ctx_t ctx)
         }
 
         /*
          * Packet Buffer Allocation (PBA)
          * Writing PBA sets the receive portion of the buffer
          * the remainder is used for the transmit buffer.
          */
         switch (hw->mac.type) {
-        /* Total Packet Buffer on these is 48K */
+        /* 82547: Total Packet Buffer is 40K */
+        case e1000_82547:
+        case e1000_82547_rev_2:
+                if (hw->mac.max_frame_size > 8192)
+                        pba = E1000_PBA_22K; /* 22K for Rx, 18K for Tx */
+                else
+                        pba = E1000_PBA_30K; /* 30K for Rx, 10K for Tx */
+                break;
+        /* 82571/82572/80003es2lan: Total Packet Buffer is 48K */
         case e1000_82571:
         case e1000_82572:
         case e1000_80003es2lan:
                         pba = E1000_PBA_32K; /* 32K for Rx, 16K for Tx */
                 break;
-        case e1000_82573: /* 82573: Total Packet Buffer is 32K */
+        /* 82573: Total Packet Buffer is 32K */
+        case e1000_82573:
                         pba = E1000_PBA_12K; /* 12K for Rx, 20K for Tx */
                 break;
         case e1000_82574:
         case e1000_82583:
                         pba = E1000_PBA_20K; /* 20K for Rx, 20K for Tx */
                 break;
         case e1000_ich8lan:
                 pba = E1000_PBA_8K;
case e1000_vfadapt_i350:
                 pba = E1000_READ_REG(hw, E1000_RXPBS);
                 pba = e1000_rxpbs_adjust_82580(pba);
                 break;
         case e1000_i210:
         case e1000_i211:
                 pba = E1000_PBA_34K;
                 break;
         default:
+                /* Remaining devices assumed to have a Packet Buffer of 64K. */
                 if (hw->mac.max_frame_size > 8192)
                         pba = E1000_PBA_40K; /* 40K for Rx, 24K for Tx */
                 else
                         pba = E1000_PBA_48K; /* 48K for Rx, 16K for Tx */
         }
 
         /* Special needs in case of Jumbo frames */
         if ((hw->mac.type == e1000_82575) && (ifp->if_mtu > ETHERMTU)) {