vtnet: Adjust rx buffer so IP header 32-bit aligned

[imp]

Summary

Call madj(m, ETHER_ALIGN) to offset rx buffers when allocating them.
This improves performance everywhere, and allows armv7 to work at all.

PR: 271288
Sponsored by: Netflix

sys/dev/virtio/network/if_vtnet.c

  * ixgbe_sbuf_fw_version
  ************************************************************************/
 static void
 ixgbe_sbuf_fw_version(struct ixgbe_hw *hw, struct sbuf *buf)
 {
         struct ixgbe_nvm_version nvm_ver = {0};
         uint16_t phyfw = 0;
         int status;
+        const char *space = "";
 
         ixgbe_get_oem_prod_version(hw, &nvm_ver); /* OEM's NVM version */
         ixgbe_get_orom_version(hw, &nvm_ver); /* Option ROM */
         ixgbe_get_etk_id(hw, &nvm_ver); /* eTrack identifies a build in Intel's SCM */
         status = ixgbe_get_phy_firmware_version(hw, &phyfw);
 
-        if (nvm_ver.oem_valid)
-                sbuf_printf(buf, "NVM OEM V%d.%d R%d ", nvm_ver.oem_major,
+        if (nvm_ver.oem_valid) {
+                sbuf_printf(buf, "NVM OEM V%d.%d R%d", nvm_ver.oem_major,
                     nvm_ver.oem_minor, nvm_ver.oem_release);
+                space = " ";
+        }
 
-        if (nvm_ver.or_valid)
-                sbuf_printf(buf, "Option ROM V%d-b%d-p%d ", nvm_ver.or_major,
-                    nvm_ver.or_build, nvm_ver.or_patch);
+        if (nvm_ver.or_valid) {
+                sbuf_printf(buf, "%sOption ROM V%d-b%d-p%d",
+                    space, nvm_ver.or_major, nvm_ver.or_build, nvm_ver.or_patch);
+                space = " ";
+        }
 
-        if (nvm_ver.etk_id != ((NVM_VER_INVALID << NVM_ETK_SHIFT) | NVM_VER_INVALID))
-                sbuf_printf(buf, "eTrack 0x%08x ", nvm_ver.etk_id);
+        if (nvm_ver.etk_id != ((NVM_VER_INVALID << NVM_ETK_SHIFT) |
+            NVM_VER_INVALID)) {
+                sbuf_printf(buf, "%seTrack 0x%08x", space, nvm_ver.etk_id);
+                space = " ";
+        }
 
         if (phyfw != 0 && status == IXGBE_SUCCESS)
-                sbuf_printf(buf, "PHY FW V%d ", phyfw);
-
-        sbuf_trim(buf);
+                sbuf_printf(buf, "%sPHY FW V%d", space, phyfw);
 } /* ixgbe_sbuf_fw_version */
 
 /************************************************************************
  * ixgbe_print_fw_version
  ************************************************************************/
 static void
 ixgbe_print_fw_version(if_ctx_t ctx)
 {